The present disclosure provides a method and device for forming a plate to have a hat shape that protrudes from a bottom surface to a certain height and has a flat surface on an upper portion. In one aspect, the method comprises a) forming a plate to have a protrusion shape having a curved surface on an upper portion such that a thickness reduction rate of the plate is substantially uniform; b) forming corner portions at both ends of the plate by moving the plate whereby the protrusion portion of the plate has a substantially flat surface; and c) forming a flat surface by correcting protruding portions in the corner portions at both ends to make the protruding portions flat.
A high-performance steel rod according to an embodiment of the present invention comprises: 0.03-0.10 wt% of carbon (C); 0.05-0.45 wt% of silicon (Si); 1.45-2.00 wt% of manganese (Mn); 0.040 wt% or less of phosphorus (P); 0.040 wt% or less of sulfur (S); 0.060 wt% or less of aluminum (Al); 0.50-1.60 wt% of nickel (Ni); 0.05-1.20 wt% of chromium (Cr); 0.30 wt% or less of copper (Cu); 0.005-0.015 wt% of nitrogen (N); and the remainer being iron (Fe) and inevitable impurities, wherein the yield strength (YS) at -170 ℃ is 550 MPa or more.
Provided is an ultra-high-strength reinforcing bar and a method for manufacturing the same are disclosed. In an exemplary embodiment, the ultra-high-strength reinforcing bar includes an amount of 0.10 to 0.45 wt % carbon (C), an amount of 0.5 to 1.0 wt % silicon (Si), an amount of 0.40 to 1.80 wt % manganese (Mn), an amount of 0.10 to 1.0 wt % chromium (Cr), an amount greater than 0 and less than or equal to 0.2 wt % vanadium (V), an amount greater than 0 and less than or equal to 0.4 wt % copper (Cu), an amount greater than 0 and less than or equal to 0.5 wt % molybdenum (Mo), an amount of 0.015 to 0.070 wt % aluminum (Al), an amount greater than 0 and less than or equal to 0.25 wt % nickel (Ni), an amount greater than 0 and less than or equal to 0.1 wt % tin (Sn), an amount greater than 0 and less than or equal to 0.05 wt % phosphorus (P), an amount greater than 0 and less than or equal to 0.03 wt % sulfur (S), an amount of 0.005 to 0.02 wt % nitrogen (N), and the remainder being iron (Fe) and other inevitable impurities.
C21D 8/06 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
C21D 8/08 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
C22C 38/42 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
C22C 38/46 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
E04C 5/06 - Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
4.
WIRE ROD FOR TIRECORD, MANUFACTURING METHOD THEREOF, AND TIRECORD MANUFACTURED BY USING SAME
The present invention relates to a wire rod for a tirecord, a manufacturing method thereof, and a tirecord manufactured by using same. More specifically, the wire rod for a tirecord comprises: 0.70-0.95 wt% of carbon (C); 0.15-0.50 wt% of silicon (Si); 0.30-0.90 wt% of manganese (M); 0.015 wt% or less of phosphorus (P); 0.015 wt% or less of sulfur (S); 0.02-0.15 wt% of copper (Cu); 0.01-0.15 wt% of nickel (Ni); 0.010 wt% or less of aluminum (Al); 0.005 wt% or less of nitrogen (N); and the balance of iron (Fe) and other inevitable impurities, and can satisfy Equation 1 below. [Equation 1] 0.05 wt% ≤ [Cu] + [Ni] ≤ 0.30 wt% (in Equation 1 above, [Cu] is the content of copper (Cu), and [Ni] is the content of nickel (Ni))
C21D 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for wiresHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for strips
B60C 9/00 - Reinforcements or ply arrangement of pneumatic tyres
5.
NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Provided is a method of manufacturing a non-oriented electrical steel sheet, the method including providing a steel material containing silicon (Si), manganese (Mn), and aluminum (AI), hot rolling the steel material, first heat treating the hot-rolled steel material before coiling, coiling the first heat-treated steel material, uncoiling and cold rolling the coiled steel material, and cold annealing the cold-rolled steel material.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
Provided is a cold-rolled steel sheet consisting of carbon (C): 0.23 wt % to 0.35 wt %, silicon (Si): 0.05 wt % to 0.5 wt %, manganese (Mn): 0.3 wt % to 2.3 wt %, phosphorus (P): more than 0 wt % and not more than 0.02 wt %, sulfur (S): more than 0 wt % and not more than 0.005 wt %, aluminum (Al): 0.01 wt % to 0.05 wt %, chromium (Cr): more than 0 wt % and not more than 0.8 wt %, molybdenum (Mo): more than 0 wt % and not more than 0.4 wt %, titanium (Ti): 0.01 wt % to 0.1 wt %, boron (B): 0.001 wt % to 0.005 wt %, a balance of iron (Fe), and unavoidable impurities, wherein a final microstructure of the cold-rolled steel sheet includes cementite, a transition carbide, and a fine precipitate, the transition carbide including ε-carbide having an atomic ratio of a substitutional element selected from Fe, Mn, Cr, and Mo, to C of 2.5:1, or η-carbide having an atomic ratio of the substitutional element to C of 2:1, and the fine precipitate having an atomic ratio of an alloying element selected from Mo and Ti, to C of 1:1.
The method for manufacturing bar steel according to an embodiment of the present invention comprises the steps of: (a) reheating bar steel containing 0.14 - 0.43 wt% of carbon (C), 0.4 - 1.75 wt% of manganese (Mn), 0.05 - 0.30 wt% of silicon (Si), 0.0 wt% (exclusive) - 0.04 wt% of phosphorus (P), 0.0 wt% (exclusive) - 0.04 wt% of sulfur (S), 0.002 wt% (exclusive) - 1.0 wt% of chromium (Cr), 0.0 wt% (exclusive) - 0.5 wt% of copper (Cu), 0.0 wt% (exclusive) - 0.25 wt% of nickel (Ni), 0.015 wt% (exclusive) - 0.085 wt% of molybdenum (Mo), 0.040 wt% or less of aluminum (Al), 0.002 wt% (exclusive) - 0.15 wt% of vanadium (V), 0.040 wt% or less of nitrogen (N), and the balance of iron (Fe) and inevitable impurities to 1,000 - 1,080℃; (b) hot rolling the steel bar while controlling the rolling to start at a temperature of 950-1050℃ and end at a temperature of 960-1,020℃; and (c) cooling the steel bar.
Provided is a method of manufacturing a non-oriented electrical steel sheet, the method including first hot-rolling each of first and second steel materials containing silicon (Si), manganese (Mn), and aluminum (Al), forming a first laminated structure by laminating the first hot-rolled first and second steel materials, forming a second laminated structure by second hot-rolling the first laminated structure, forming a third laminated structure by cold-rolling the second laminated structure, and cold-annealing the third laminated structure.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
In one aspect, an electric furnace is provided with a double type melting furnace, which includes: a first upper cell that forms a first upper space of a first melting furnace in which a first iron source is introduced and molten; a second upper cell that is disposed in a horizontal direction of the first upper cell and forms a second upper space of a second melting furnace in which a second iron source is introduced and molten; a lower cell that is combined with lower portions of the first upper cell and the second upper cell and forms a single integrated space in which a first lower space of the first melting furnace and a second lower space of the second melting furnace are integrated; and a partition wall unit that is installed to vertically move up and down between the first upper cell and the second upper cell, and separates the first lower space of the first melting furnace and the second lower space of the second melting furnace, although both of the lower spaces are integrally formed by the lower cell.
F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
C21B 13/12 - Making spongy iron or liquid steel, by direct processes in electric furnaces
F27B 3/08 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces heated electrically, e.g. electric arc furnaces, with or without any other source of heat
F27B 3/10 - Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
F27B 3/22 - Arrangements of air or gas supply devices
F27D 3/00 - ChargingDischargingManipulation of charge
H05B 7/20 - Direct heating by arc discharge, i.e. where at least one end of the arc directly acts on the material to be heated, including additional resistance heating by arc current flowing through the material to be heated
The present application relates to a metal separator, a fuel cell comprising the metal separator, and a fuel cell stack comprising the fuel cell. According to the metal separator of the present application, it is possible to secure airtightness while preventing deformation of manifold inlet-and-outlet holes, and to uniformly distribute the flow rate of an injected and discharged reaction gas.
H01M 8/0228 - Composites in the form of layered or coated products
H01M 8/0247 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the form
H01M 8/0258 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
H01M 8/0273 - Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
H01M 8/1004 - Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
H01M 8/0271 - Sealing or supporting means around electrodes, matrices or membranes
Provided is an ultra-high strength cold-rolled steel sheet, including: carbon (C): 0.23% to 0.40%; silicon (Si): 0.05% to 1.0%; manganese (Mn): 0.5% to 3.0%; vanadium (V): 0.01% to 0.12%; aluminum (Al): 0.01% to 0.3%; chromium (Cr): greater than 0% and 0.5% or less; titanium (Ti): greater than 0% and 0.1% or less; phosphorus (P): greater than 0% and 0.02% or less; sulfur(S): greater than 0% and 0.01% or less; and boron (B): 0.001% to 0.005%, based on % by weight; and a remainder being Fe and other unavoidable impurities, wherein a final microstructure includes tempered martensite having a volume fraction of 90% or more, wherein an average spacing between precipitates in the tempered martensite is 300 nm or more, an average size of the precipitates is 200 nm or less, and the number of precipitates having an average size of 40 nm or less is 25 or more based on an area of 20 μm2 in the final microstructure.
Provided are an ultra-high strength cold-rolled steel sheet whose microstructure has been controlled to have high strength and elongation, and a manufacturing method thereof. In accordance with an embodiment of the present disclosure, the ultra-high strength cold-rolled steel sheet includes: carbon (C): 0.28% to 0.45%; silicon (Si): 1.0% to 2.5%; manganese (Mn): 1.5% to 3.0%; aluminum (Al): 0.01% to 0.05%; chromium (Cr): greater than 0% and 1.0% or less; molybdenum (Mo): greater than 0% and 0.5% or less; a total of niobium (Nb), titanium (Ti) and vanadium (V): greater than 0% and 0.1% or less; phosphorus (P): greater than 0% and 0.03% or less; sulfur (S): greater than 0% and 0.03% or less; and nitrogen (N): greater than 0% and 0.01% or less, based on % by weight; and the remainder being Fe and other unavoidable impurities, wherein the ultra-high strength cold-rolled steel sheet satisfies a yield strength (YP) of 1180 MPa or more, a tensile strength (TS) of 1470 MPa or more, an elongation (El) of 15% or more, a yield ratio (YR) of 75% or more, and a bendability (R/t) of 3.0 or less.
According to an aspect of the present disclosure, provided is a hot stamping part including a steel plate that includes carbon (C) in an amount of 0.26 to 0.40 wt %, silicon (Si) in an amount of 0.02 to 2.0 wt %, manganese (Mn) in an amount of 0.3 to 1.60 wt %, phosphorus (P) in an amount of 0.03 wt % or less, sulfur(S) in an amount of 0.008 wt % or less, chromium (Cr) in an amount of 0.05 to 0.90 wt %, boron (B) in an amount of 0.0005 to 0.01 wt %, molybdenum (Mo) in an amount of 0.05 to 0.2 wt %, titanium (Ti) in an amount of 0.001 to 0.095 wt %, niobium (Nb) in an amount of 0.001 to 0.095 wt %, vanadium (V) in an amount of 0.001 to 0.095 wt %, the balance of iron (Fe), and other inevitable impurities, the hot stamping part having tensile strength of 1,700 MPa or more and yield strength of 1,150 MPa or more, wherein the hot stamping part includes microstructure including austenite grains and carbon-based precipitates including at least one of niobium (Nb), titanium (Ti), molybdenum (Mo), and vanadium (V), and an average size of the austenite grains is 15 μm or less.
A hot stamping part includes: a base material; a decarburization layer located on the base material; and an inner oxide layer located on the decarburization layer, wherein the hot stamping part has a tensile strength (TS) of 1680 MPa to 2000 MPa, and a hardness of the hot stamping part within a depth of 50 μm from a surface of the hot stamping part in a plate thickness direction of the hot stamping part and an average hardness of the hot stamping part satisfy Relational Expression 1.
A hot stamping part includes: a base material; a decarburization layer located on the base material; and an inner oxide layer located on the decarburization layer, wherein the hot stamping part has a tensile strength (TS) of 1680 MPa to 2000 MPa, and a hardness of the hot stamping part within a depth of 50 μm from a surface of the hot stamping part in a plate thickness direction of the hot stamping part and an average hardness of the hot stamping part satisfy Relational Expression 1.
(
A
/
B
)
≤
0
.
7
<
Relational
Expression
1
>
A hot stamping part includes: a base material; a decarburization layer located on the base material; and an inner oxide layer located on the decarburization layer, wherein the hot stamping part has a tensile strength (TS) of 1680 MPa to 2000 MPa, and a hardness of the hot stamping part within a depth of 50 μm from a surface of the hot stamping part in a plate thickness direction of the hot stamping part and an average hardness of the hot stamping part satisfy Relational Expression 1.
(
A
/
B
)
≤
0
.
7
<
Relational
Expression
1
>
(In Relational Expression 1, A denotes the hardness (Hv(≤50 μm)) within the depth of 50 μm in the plate thickness direction of the hot stamping part, and B denotes the average hardness (Hv(avg.)) of the hot stamping part.)
A hot stamping component includes: a base material; a decarburization layer located on the base material; and an inner oxide layer located on the decarburization layer, wherein the hot stamping component has a tensile strength (TS) of 1350 MPa to 1680 MPa, and a hardness of the hot stamping component within a depth of 50 μm from a surface of the hot stamping component in a plate thickness direction of the hot stamping component and an average hardness of the hot stamping component satisfy Relational Expression 1.
A hot stamping component includes: a base material; a decarburization layer located on the base material; and an inner oxide layer located on the decarburization layer, wherein the hot stamping component has a tensile strength (TS) of 1350 MPa to 1680 MPa, and a hardness of the hot stamping component within a depth of 50 μm from a surface of the hot stamping component in a plate thickness direction of the hot stamping component and an average hardness of the hot stamping component satisfy Relational Expression 1.
(
A
/
B
)
≤
0
.
7
<
Relational
Expression
1
>
A hot stamping component includes: a base material; a decarburization layer located on the base material; and an inner oxide layer located on the decarburization layer, wherein the hot stamping component has a tensile strength (TS) of 1350 MPa to 1680 MPa, and a hardness of the hot stamping component within a depth of 50 μm from a surface of the hot stamping component in a plate thickness direction of the hot stamping component and an average hardness of the hot stamping component satisfy Relational Expression 1.
(
A
/
B
)
≤
0
.
7
<
Relational
Expression
1
>
(In Relational Expression 1, A denotes the hardness (Hv(≤50 μm)) within the depth of 50 μm in the plate thickness direction of the hot stamping component, and B denotes the average hardness (Hv(avg.)) of the hot stamping component.)
The present application relates to a metal separator, a fuel cell comprising the metal separator, and a fuel cell stack comprising the fuel cell. According to the metal separator of the present application, deformation of manifold inlet and outlet holes can be prevented, airtightness can be ensured, and the flow rates of injected and discharged reaction gases can be uniformly distributed.
H01M 8/0247 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the form
H01M 8/0258 - CollectorsSeparators, e.g. bipolar separatorsInterconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
H01M 8/0273 - Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
H01M 8/0245 - Composites in the form of layered or coated products
H01M 8/1004 - Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
H01M 8/2483 - Details of groupings of fuel cells characterised by internal manifolds
Korea University Research and Business Foundation (Republic of Korea)
Korea Institute of Science and Technology (Republic of Korea)
Inventor
Chung, Jun Ho
Kim, Tae Hyung
Abstract
Provided is a steel reinforcement including an amount of 0.07 to 0.43 wt % of carbon (C), an amount of 0.5 to 2.0 wt % of manganese (Mn), an amount of 0.05 to 0.5 wt % of silicon (Si), an amount greater than 0 and less than or equal to 0.5 wt % of chromium (Cr), an amount greater than 0 and less than or equal to 4.5 wt % of copper (Cu), an amount greater than 0 and less than or equal to 0.003 wt % of boron (B), an amount greater than 0 and less than or equal to 0.25 wt % of vanadium (V), an amount greater than 0 and less than or equal to 0.012 wt % of nitrogen (N), an amount greater than 0 and less than or equal to 0.03 wt % of phosphorus (P), an amount greater than 0 and less than or equal to 0.03 wt % of sulfur(S), an amount of 0.01 to 0.5 wt % of the sum of one or more of nickel (Ni), niobium (Nb) and titanium (Ti), the balance of iron (Fe), and other inevitable impurities. A final microstructure includes ferrite, bainite, pearlite, retained austenite, and precipitates comprising copper.
A high-performance steel bar, according to one embodiment of the present invention, comprises 0.04-0.09 wt% of carbon (C), 0.6 wt% or less (excluding 0) of silicon (Si), 1.45-2.5 wt % of manganese (Mn), 0.2-2.0 wt% of nickel (Ni), 0.7 wt% or less (excluding 0) of chromium (Cr), 0.001-0.07 wt% of niobium (Nb), 0.003-0.09 wt% of vanadium (V), 0.02 wt% or less (excluding 0) of phosphorus (P), 0.02 wt% or less (excluding 0) of sulfur (S), 0.5 wt% or less (excluding 0) of copper (Cu), 0.002-0.05 wt% of molybdenum (Mo), 0.001-0.07 wt% of aluminum (Al), 0.01 wt% or less (excluding 0) of nitrogen (N), and the balance of iron (Fe) and inevitable impurities, and satisfies formula 1 below, wherein the yield strength (YSun) of an unnotched specimen at -170°C is 600 MPa or more. [Formula 1] 1668.26×C(wt%) + 1157.54×Si(wt%) + 81.40×Mn(wt%) + 94.51×Ni(wt%) + 202.33×Cr(wt%) + 5228.70×Nb(wt%) + 2256.36×V(wt%) ≥ 595.01
In one aspect, a method of manufacturing an ultra-high strength galvanized steel sheet is provided, the method including a step of annealing a cold-rolled steel sheet in an annealing furnace, wherein an annealing time (A) for performing the annealing and a moisture concentration (B) in the annealing furnace are controlled based on the product of the positive square root (A1/2) of the annealing time and the natural logarithm value (ln(1/B)) of the reciprocal value of the moisture concentration.
The present invention relates to a non-oriented electrical steel sheet and a method for manufacturing same. According to the non-oriented electrical steel sheet and the method for manufacturing same of the present application, deformation of the steel sheet during heat treatment can be minimized to suppress an increase in iron loss, and thus excellent magnetic properties can be achieved.
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
H01F 1/147 - Alloys characterised by their composition
21.
INTEGRATED SYSTEM FOR REGENERATING SODIUM BICARBONATE AND RECOVERING AMMONIA
HYUNDAI ENGINEERING ＆ CONSTRUCTION CO., LTD. (Republic of Korea)
Inventor
Song, Kang
Cha, Kwang Seo
Park, Jun Young
Lee, Je Shin
Lee, Sang Hyung
Park, In Sun
Kim, Jong Hwan
Park, Jong Sik
Park, Sung Hyun
Abstract
The present application relates to an integrated system for regenerating sodium bicarbonate and recovering ammonia, and an integrated method for regenerating sodium bicarbonate and recovering ammonia by using same. According to the integrated system for regenerating sodium bicarbonate and recovering ammonia, and the integrated method for regenerating sodium bicarbonate and recovering ammonia by using same, of the present application, sodium bicarbonate can be regenerated and ammonia can be recovered from ammonium sulfate wastewater, generated during sodium bicarbonate regeneration, so as to be reused as ammonia water, and thus the cost of purchasing ammonia water required for process operation can be reduced, and additional operating revenue can be created through the commercialization of the generated ammonia water.
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
A material for hot stamping according to an embodiment of the present disclosure includes: a steel sheet including carbon (C) in an amount of 0.28 to 0.50 wt %, silicon (Si) in an amount of 0.15 to 0.70 wt %, manganese (Mn) in an amount of 0.5 to 2.0 wt %, phosphorus (P) in an amount of 0.05 wt % or less, sulfur(S) in an amount of 0.01 wt % or less, chromium (Cr) in an amount of 0.1 to 0.5 wt %, boron (B) in an amount of 0.001 to 0.005 wt %, an additive in an amount of 0.1 wt % or less, a remainder of iron (Fe), and other inevitable impurities; fine precipitates distributed inside the steel sheet, wherein the additive includes at least one of titanium (Ti), niobium (Nb), and vanadium (V), the fine precipitates include nitride or carbide of at least one of titanium (Ti), niobium (Nb), and vanadium (V), and traps hydrogen, and a mean diameter variation coefficient, which is a value obtained by dividing a standard deviation of a mean diameter of the fine precipitates by the mean diameter of the fine precipitates, is 0.7 or less.
An embodiment of the present invention discloses a hot-stamped part including: a base steel sheet; and a plated layer provided on the base steel sheet and including zinc (Zn), magnesium (Mg), silicon (Si), aluminum (Al), strontium (Sr), and the balance of iron (Fe) and other inevitable impurities, wherein the plated layer includes an alloying blocking layer, an intermediate alloy layer, and a corrosion resistance reinforcement layer which are sequentially stacked from the base steel sheet, and the corrosion resistance reinforcement layer includes an Sr-containing surface oxide layer.
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
24.
NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING NON-ORIENTED ELECTRICAL STEEL SHEET
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
The present disclosure provides a material for hot stamping including: a steel sheet including carbon (C) in an amount of 0.19 to 0.25 wt %, silicon (Si) in an amount of 0.1 to 0.6 wt %, manganese (Mn) in an amount of 0.8 to 1.6 wt %, phosphorus (P) in an amount of 0.03 wt % or less, sulfur(S) in an amount of 0.015 wt % or less, chromium (Cr) in an amount of 0.1 to 0.6 wt %, boron (B) in an amount of 0.001 to 0.005 wt %, an additive in an amount of 0.1 wt % or less, a remainder of iron (Fe), and other inevitable impurities; fine precipitates distributed inside the steel sheet, wherein the additive includes at least one of titanium (Ti), niobium (Nb), and vanadium (V), the fine precipitates include nitride or carbide of at least one of titanium (Ti), niobium (Nb), and vanadium (V), the fine precipitates trap hydrogen, and a mean diameter variation coefficient, which is a value obtained by dividing a standard deviation of a mean diameter of the fine precipitates by the mean diameter of the fine precipitates, is 0.8 or less.
A non-oriented electrical steel sheet according to one embodiment of the present invention comprises 2.8-3.8 wt% of silicon (Si), 0.2-0.5 wt% of manganese (Mn), 0.5-1.5 wt% of aluminum (Al), 0.005 wt% or less of carbon (C), 0.005 wt% or less of sulfur (S), 0.015 wt% or less of phosphorus (P), 0.005 wt% or less of nitrogen (N), 0.005 wt% or less of titanium (Ti), 0.08 wt% or less of tin (Sn), 0.07 wt% or less of nickel (Ni), 0.07 wt% or less of copper (Cu) and the balance of iron (Fe) and other inevitable impurities, and has a secondary phase volume fraction, which is a particle size of 1.1 μm or more, of 50% or more, and thus can have excellent mechanical properties and magnetic properties.
C22C 38/08 - Ferrous alloys, e.g. steel alloys containing nickel
C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
27.
NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR
A method for manufacturing a non-oriented electrical steel sheet, according to one embodiment of the present invention, comprises the steps of: (a) preparing steel that is a half-finished product comprising 2.5-3.8 wt% of silicon (Si), 1.45 wt% or more of nickel (Ni), 0.05 wt% or less of aluminum (Al) and the balance of iron (Fe) and other inevitable impurities; (b) hot rolling the steel, thereby forming a hot-rolled steel sheet; (c) cold rolling the hot-rolled steel sheet, thereby forming a cold-rolled steel sheet; and (d) cold roll annealing the cold-rolled steel sheet, wherein step (d) comprises the steps of: (d-1) increasing the temperature from room temperature to a first temperature at which austenite phase is stable, and then maintaining same for a first set time; (d-2) lowering the temperature to a second temperature at which a two-phase region where austenite phase and ferrite phase coexist is stable, and then maintaining same for a second set time; and (d-3) lowering the temperature to room temperature, and the phase transformation heat treatment in the cold rolling annealing step can improve the texture such that an orientation favorable to magnetism is developed, and can enhance magnetic properties.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/08 - Ferrous alloys, e.g. steel alloys containing nickel
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
According to one embodiment of the present invention, a non-oriented electrical steel sheet and a method for manufacturing the non-oriented electrical steel sheet can be provided, the non-oriented electrical steel sheet comprising 2.8-3.8 wt% of silicon (Si), 0.2-0.5 wt% of manganese (Mn), 0.5-1.5 wt% of aluminum (Al), 0.005 wt% or less of carbon (C), 0.005 wt% or less of sulfur (S), 0.015 wt% or less of phosphorus (P), 0.005 wt% or less of nitrogen (N), 0.005 wt% or less of titanium (Ti), 0.08 wt% or less of tin (Sn), 0.07 wt% or less of nickel (Ni), 0.07 wt% or less of copper (Cu) and the balance of iron (Fe) and other inevitable impurities, satisfying relation 1 and having high strength and high efficiency. [Relation 1] 3.0 < log T < 0.4 (T = 5*[S]+12*[Ti]+6*[P]+5*[Sn]+15*[Ni]+11*[Cu], wherein [S], [Ti], [P], [Sn], [Ni] and [Cu] represent the amounts (ppm) of S, Ti, P, Sn, Ni and Cu, respectively.)
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
29.
HIGH-PERFORMANCE STEEL ROD AND MANUFACTURING METHOD THEREOF
A high-performance steel rod according to an embodiment of the present invention comprises 0.03-0.12 wt% of carbon (C), 0.50 wt% or less of silicon (Si), 1.3-2.0 wt% of manganese (Mn), 0.02 wt% or less of phosphorus (P), 0.02 wt% or less of sulfur (S), 0.002-0.50 wt% of chromium (Cr), 0.5 wt% or less of copper (Cu), 0.35-0.65 wt% of nickel (Ni), 0.002-0.10 wt% of molybdenum (Mo), 0.005-0.04 wt% of aluminum (Al), 0.005-0.045 wt% of vanadium (V), 0.004-0.045 wt% of niobium (Nb), 0.001-0.015 wt% of titanium (Ti), and 0.015 wt% or less of nitrogen (N), with the remainder comprising iron (Fe) and inevitable impurities, and has a room-temperature yield strength (YS) of 500 MPa or more.
C21D 8/06 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
C21D 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for wiresHeat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for strips
30.
STEEL WIRE ROD FOR TIRECORD HAVING EXCELLENT DRAWABILITY, PREPARATION METHOD THEREFOR, AND TIRECORD PREPARED BY USING SAME
The present invention relates to a steel wire rod for a tirecord, having excellent drawability, a preparation method therefor, and a tirecord prepared by using same, and implements a steel wire rod for a tirecord, having excellent drawability and 0.005 wt% or less of nitrogen (N), a preparation method therefor, and a tirecord prepared by using same, the steel wire rod comprising 0.70-0.95 wt% of carbon (C), 0.15-0.50 wt% of silicon (Si), 0.30-0.90 wt% of manganese (Mn), 0.015 wt% or less of phosphorus (P), 0.015 wt% or less of sulfur (S), 0.10 wt% or less of copper (Cu), 0.05 wt % or less of nickel (Ni), 0.010 wt% or less of aluminum (Al), and the remainder of iron (Fe) and other inevitable impurities.
B21B 1/18 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-sectionSequence of operations in milling trainsLayout of rolling-mill plant, e.g. grouping of standsSuccession of passes or of sectional pass alternations for rolling wire or material of like small cross-section in a continuous process
C21D 8/06 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
The present invention relates to a material analysis method which may comprise the steps of: (a) preparing a specimen for structure analysis; (b) training an artificial intelligence model with training images labelled with structural aspects of arbitrary specimens; (c) analyzing a plurality of images for analysis not labelled with structural aspects of specimens by using the trained artificial intelligence model, and removing images for analysis classified as preset noise structural aspects; and (d) using the trained artificial intelligence model to analyze the images for analysis that remain after the images for analysis classified as the noise structural aspects are removed, and classifying the remaining images for analysis as at least one target structural aspect.
Plated steel of the present invention comprises a base iron and a plating layer, which is formed on the base iron and comprises 1-3 wt% of aluminum (Al), 1-2 wt% of magnesium (Mg) and the balance of zinc (Zn) and other inevitable impurities, wherein the weight ratio of aluminum and magnesium in the plating layer is 1.2 or greater, the plating layer comprises a primary Zn phase structure and a eutectic phase structure, the primary Zn phase structure has a multilayer structure in the height direction of the plating layer, the area fraction of the primary Zn phase structure having a multilayer structure in the plating layer is 30% or higher, and the thickness of the plating layer is 15-50 μm.
A section steel according to an exemplary embodiment of the present invention is characterized in that it includes an amount of 0.08 to 0.17% by weight of carbon (C), an amount of 0.50 to 1.60% by weight of manganese (Mn), an amount of 0.10 to 0.50% by weight of silicon (Si), an amount of 0.10 to 0.70% by weight of chromium (Cr), an amount greater than 0 and 0.5% by weight or less of copper (Cu), an amount of 0.30 to 0.70% by weight of molybdenum (Mo), an amount greater than 0 and 0.02% by weight or less of phosphorus (P), an amount greater than 0 and 0.01% by weight or less of sulfur(S), an amount greater than 0 and 0.012% by weight or less of nitrogen (N), an amount greater than 0 and 0.003% by weight or less of boron (B), an amount of 0.01 to 0.5% by weight of the sum of at least one or more of nickel (Ni), vanadium (V), niobium (Nb), and titanium (Ti), and the remainder of iron (Fe) and other unavoidable impurities, and has a tensile strength of 490 to 620 MPa, a yield strength of 355 MPa or greater, and a yield ratio of 0.8 or less at room temperature, and a high-temperature yield strength of 273 MPa or greater at a temperature of 600° C.
Disclosed is a battery casing for a vehicle. The battery casing includes a housing having a lateral surface portion, a first reinforcement part coupled to the lateral surface portion to define a closed cross-section, a second reinforcement part coupled to the first reinforcement part, and a side panel configured to integrally surround the second reinforcement part.
H01M 50/249 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders specially adapted for aircraft or vehicles, e.g. cars or trains
H01M 50/242 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
The present invention relates to a material analysis method which may comprise the steps of: (a) preparing a specimen for structure analysis; (b) training an artificial intelligence model with a training image labelled with a structure aspect of an arbitrary specimen; (c) analyzing a plurality of analysis images not labelled with a structure aspect of a specimen using the trained artificial intelligence model, and removing analysis images classified into preset noise structure aspects; and (d) analyzing, by using the trained artificial intelligence model, the analysis images from which the analysis images classified into the noise structure aspects have been removed, and classifying the analysis images into at least one target structure aspect.
The present application relates to a metal separator and a manufacturing method therefor, the metal separator comprising: a first base material; and a porous body laminated on the upper surface of the first base material, wherein the porous body has a plurality of holes and surface portions present between the plurality of holes, and the upper surfaces of the surface portions and the inner surfaces of the holes each have a surface-modified layer. According to the metal separator and the manufacturing method therefor of the present application, not only electrical conductivity but also corrosion resistance can be excellent.
C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
The present application relates to a metal separator and a method for manufacturing same. The metal separator and the method for manufacturing same, according to the present application, make it possible to ensure, at a low cost, excellent corrosion resistance and electrical conductivity.
C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
C22C 38/20 - Ferrous alloys, e.g. steel alloys containing chromium with copper
C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
The present application relates to a metal separator and a manufacturing method therefor, the metal separator comprising a first base material comprising a first manifold part, a second manifold part, and a reaction part provided between the first and second manifold parts, wherein the first and second manifold parts each have a plurality of openings and surface portions present between the plurality of openings, and the upper surfaces of the surface portions and the inner surfaces of the openings each have a surface-modified layer. According to the metal separator and the manufacturing method therefor, not only electrical conductivity but also corrosion resistance can be excellent.
C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
The present application relates to a metal separator and a manufacturing method therefor, the metal separator comprising a first base material comprising a first manifold part, a second manifold part, and a reaction part provided between the first and second manifold parts, wherein the first and second manifold parts each have a plurality of openings and surface portions present between the plurality of openings, a surface-modified layer is formed on the upper surfaces of the surface portions, and a surface-modified layer is not formed on the inner surfaces of the openings. Excellent corrosion resistance and electrical conductivity can be ensured at a low cost.
H01M 8/0245 - Composites in the form of layered or coated products
C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
C22C 38/20 - Ferrous alloys, e.g. steel alloys containing chromium with copper
C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
The present invention provides a plated steel material having excellent processability and corrosion resistance, the plated steel material comprising: a base iron; and a hot-dip alloy-plated layer formed on the base iron, the hot-dip alloy-plated layer comprising, in wt %, 5-30% of Al, 2-10% of Mg, and a balance of Zn and other inevitable impurities, wherein, in a cross-section in the hot-dip alloy-plated layer, the area fraction of a MgZn2 phase is 20-70%, and the ratio of the area fraction of an Al-containing phase to the area fraction of the MgZn2 phase is 1-70%.
A method for operating an electric furnace is provided. The method for operating an electric furnace comprises the steps of: melting a first iron source in a first melting furnace in which a first electrode part is disposed; preheating a second iron source in a second melting furnace in which a second electrode part is disposed; and melting the second iron source in the second melting furnace, wherein: the first melting furnace and the second melting furnace share an internal space; in the step of preheating the second iron source, the second electrode part emits a first gas; and in the step of melting the second iron source, the second electrode part emits a second gas different from the first gas.
F27B 3/28 - Arrangement of controlling, monitoring, alarm or like devices
F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
A method for manufacturing a metal separator for a vehicle fuel cell according to an aspect of the present disclosure comprises the steps of: preparing a base material; applying a platinum (Pt)-containing coating agent and an electrolyte to the base material to form a discontinuous coating film; and thermally treating the coating film-formed base material.
Disclosed are an aluminum-coated blank, a manufacturing method thereof, and an apparatus for manufacturing the same. The blank includes two or more aluminum-coated steel sheets connected together by a joint, each of the steel sheets including: a base steel sheet including 0.01-0.5 wt % of carbon, 0.01-1.0 wt % of silicon, 0.5-3.0 wt % of manganese, greater than 0 but not greater than 0.05 wt % of phosphorus, greater than 0 but not greater than 0.01 wt % of sulfur, greater than 0 but not greater than 0.1 wt % of aluminum, greater than 0 but not greater than 0.001 wt % of nitrogen, and the balance of iron and other inevitable impurities; and a coating layer including aluminum and formed on at least one surface of the base steel sheet.
The present application relates to a metal separator plate and a method for manufacturing same. According to the metal separator plate and manufacturing method therefor in the present application, excellent electrical conductivity, corrosion resistance, and superior adhesion of the coating layer can be achieved.
According to an exemplary embodiment of the present disclosure, disclosed is an aluminum coated blank that includes a first coated steel sheet; a second coated steel sheet connected to the first coated steel sheet; and a joint portion that connects the first coated steel sheet to the second coated steel plate at a boundary between the first coated steel sheet and the second coated steel sheet.
Disclosed are an aluminum-coated blank, a manufacturing method thereof, and an apparatus for manufacturing the same. The blank includes two or more aluminum-coated steel sheets connected together by a joint, each of the steel sheets including: a base steel sheet including 0.01-0.5 wt % of carbon, 0.01-1.0 wt % of silicon, 0.5-3.0 wt % of manganese, greater than 0 but not greater than 0.05 wt % of phosphorus, greater than 0 but not greater than 0.01 wt % of sulfur, greater than 0 but not greater than 0.1 wt % of aluminum, greater than 0 but not greater than 0.001 wt % of nitrogen, and the balance of iron and other inevitable impurities; and a coating layer including aluminum and formed on at least one surface of the base steel sheet.
The present application relates to a hot stamping part and manufacturing method therefor According to the hot press part and manufacturing method therefor of the present application, a hot press part with suppressed hydrogen embrittlement and ultra-high strength can be obtained.
C23C 2/06 - Zinc or cadmium or alloys based thereon
G01N 15/08 - Investigating permeability, pore volume, or surface area of porous materials
G01N 27/26 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variablesInvestigating or analysing materials by the use of electric, electrochemical, or magnetic means by using electrolysis or electrophoresis
B21D 22/02 - Stamping using rigid devices or tools
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
48.
HIGH-STRENGTH AND HIGH-FORMABILITY STEEL SHEET, AND METHOD FOR MANUFACTURING SAME
C, weight%Si, weight%Mn, weight%weight% ≤ 0.4, and satisfies the yield strength (YS): 500 MPa or more, tensile strength (TS): 980 MPa or greater, total elongation (T.EL): 23% or more, and the product of tensile strength and elongation: 23,000 MPa% or greater.
According to one aspect of the present invention, a high strength cold-rolled steel sheet is provided. According to an embodiment of the present invention, the high strength cold-rolled steet sheet comprises, by wt%, 0.1-0.3 % of carbon (C), 1.0-2.0 % of silicon (Si), 1.5-3.0 % of manganese (Mn), 0.01-0.05 % of aluminum (Al), 0.02 % or less of phosphorus (P), 0.005 % or less of sulfur (S), and the remainder of iron (Fe) and other inevitable impurities. According to an embodiment of the present invention, a microstructure of the high strength cold-rolled steet sheet consists of, by area rate, 25-35 % of ferrite, 10-18 % of residual austenite, 5 % or less of M-A (martensite-austenite composite phase), and the remainder of martensite.
An aluminum-based plating blank according to one embodiment of the present invention comprises: a first plated steel plate; a second plated steel plate connected to the first plated steel plate; and a joint for connecting the first plated steel plate and the second plated steel plate at the boundary between the first plated steel plate and the second plated steel plate.
The present invention provides a hot-stamped component having a piercing part formed thereon, comprising: a base material; a mutual diffusion layer disposed on the base material; and a plating layer disposed on the mutual diffusion layer, wherein the hot-stamped component includes a front-end processing surface formed at the edge of the piercing part, the front-end processing surface includes a roll over surface, a front-end surface, and a fracture surface, and a thickness (th1) of the fraction surface and a thickness (th2) of the front-end processing surface satisfy equation 1 (th1/th2≤0.6).
The present invention provides a manufacturing method for hot-stamped parts, the method comprising: a heating step of heating a blank; a transfer step of transferring the heated blank to a press mold including a punch; and a forming and piercing step of hot-forming the transferred blank into the shape of a hot-stamped part and hot-piercing the transferred blank to form a pierced portion in the hot-stamped part.
According to one aspect of the present invention, an ultra-high strength cold-rolled steel sheet is provided. The ultra-high strength cold-rolled steel sheet comprises, in weight %, 0.28% to 0.4% of carbon (C), 1.0% to 2.0% of silicon (Si), 1.0% to 3.0% of manganese (Mn), 0.01% to 0.3% of aluminum (Al), 0.01 % to 0.05% of niobium (Nb), 0% (exclusive) to 0.02% of phosphorous (P), 0% (exclusive) to 0.003% of sulfur (S), 0.001% to 0.005% of boron (B), and the remainder of iron (Fe) and other unavoidable impurities. According to an embodiment of the present invention, the microstructure of the ultra-high strength cold-rolled steel sheet comprises, in area fractions, 40 to 60% of lath-type ferrite, 20 to 30% of lath-type M-A, and 15% or less (greater than 0) of massive M-A, and 15 to 25% of retained austenite.
The present invention provides: an ultra-high tensile cold-rolled steel sheet having a balance of improved strength and ductility; and a method for manufacturing same. According to an embodiment of the present invention, the ultra-high tensile cold-rolled steel sheet contains, in wt%, 0.1-0.3% of carbon (C), 1.0-2.0% of silicon (Si), 1.5-3.0% of manganese (Mn), more than 0% and no more than 0.05% of aluminum (Al), more than 0% and no more than 0.05% in total of at least one selected from among titanium (Ti), niobium (Nb), and vanadium (V), more than 0% and no more than 0.02% of phosphorus (P), more than 0% and no more than 0.005% of sulfur (S), and more than 0% and no more than 0.006% of nitrogen (N), with the remainder comprising iron (Fe) and inevitable impurities, has a yield strength (YS) of at least 850 MPa, a tensile strength (TS) of at least 1180 MPa, an elongation (EL) of at least 14%, and a hole expansion ratio of at least 25%, and satisfies TS × EL × HER/1000 ≥ 500.
C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
C22C 38/34 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
55.
ULTRA-HIGH STRENGTH COLD-ROLLED STEEL SHEET WITH CORROSION RESISTANCE AND MANUFACTURING METHOD THEREFOR
The present invention provides an ultrahigh strength cold-rolled steel sheet with corrosion resistance comprising, in weight%, carbon (C): 0.1% to 0.5%, silicon (Si): 0.01% to 2.0%, manganese (Mn): 0.1% to 5.0%, aluminum (Al): 0.01% to 2.0%, chromium (Cr): 0% (exclusive) to 3.0%, molybdenum (Mo): 0% (exclusive) to 1.0%, nickel (Ni): 0.02% to 3.0%, copper (Cu): 0.02% to 3.0%, titanium (Ti): 0.01% to 0.2% , niobium (Nb): 0.01% to 0.1%, vanadium (V): 0.01% to 1.0%, boron (B): 0.001% to 0.005%, phosphorus (P): 0% (exclusive) to 0.02%, sulfur (S) : 0% (exclusive) to 0.01%, and the balance being iron (Fe) and other inevitable impurities, wherein the ratio ([Cu]/[Ni]) of the content of copper (Cu) divided by the content of nickel (Ni) ranges from 0.54 to 5.7, and the steel sheet satisfies a yield strength (YS) of 1000 MPa or more, a tensile strength (TS) of 1100 MPa or more, an elongation (EL) of 3% or more, and a fracture-free time of 100 hours or more according to hydrogen embrittlement test method.
The present invention provides a highly corrosion-resistant plated steel with excellent corrosion resistance and a manufacturing method therefor. According to an embodiment of the present invention, the method for manufacturing the highly corrosion-resistant plated steel comprises the steps of: immersing base iron in a molten alloy plating bath containing, by weight%, aluminum (Al): 6% to 18%, magnesium (Mg): 3% to 6%, and the balance being zinc (Zn) and other inevitable impurities; withdrawing the immersed base iron from the molten alloy plating bath and forming a molten alloy plating layer on the base iron; and cooling the base iron with the formed molten alloy plating layer formed thereon, wherein the content ratio of aluminum to magnesium in the molten alloy plating bath ranges from 2:1 to 6:1.
An electrical steel sheet according to the present disclosure contains, based on weight, Si of 2.0% to 4.0%, Mn of more than 0.5% and 2.0% or less, S of 0.01% or less (excluding 0%), C of 0.01% or less (excluding 0%), N of 0.01% or less (excluding 0%), and the balance composed of Fe and unavoidable impurities. The iron steel sheet is composed of (001) crystal grains, has a thickness of 0.05 to 0.25 mm after two-stage cold rolling, and an angle (θ) of 0°≤θ≤8° between a rolling direction and [100] crystal orientation exhibiting a maximum surface intensity in (001) texture.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
The present invention provides a non-quenched and tempered steel wire with excellent cold forging properties and manufacturing method therefor. According to an embodiment of the present invention, the non-quenched and tempered steel wire with cold forging properties comprises, by weight%, carbon (C): approximately 0.20% to 0.40%, silicon (Si): approximately 0.10% to 0.30%, manganese (Mn): approximately 1.30% to 1.60%, phosphorus (P): approximately 0% (exclusive) to 0.05%, sulfur (S): approximately 0% (exclusive) to 0.05%, chromium (Cr): approximately 0.02% to 0.30%, nickel (Ni): approximately 0.02% to 0.30%, molybdenum (Mo): approximately 0.02% to 0.30%, vanadium (V): approximately 0.01% to 0.15%, niobium (Nb): approximately 0.01% to 0.05%, aluminum (Al): approximately 0.005% to 0.060%, titanium (Ti): approximately 0.005% to 0.020%, copper (Cu): approximately 0.01% to 0.30%, boron (B): approximately 0.0001% to 0.0020%, nitrogen (N): approximately 0.005% to 0.015%, and the balance being Iron (Fe) and other inevitable impurities, wherein the sum of niobium (Nb) and vanadium (V) amount to approximately 0.02% to 0.2%, and the steel wire can achieve a tensile strength of at least 900MPa.
B21B 1/16 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-sectionSequence of operations in milling trainsLayout of rolling-mill plant, e.g. grouping of standsSuccession of passes or of sectional pass alternations for rolling wire or material of like small cross-section
B21B 15/00 - Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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balls of steel; wholesale store services featuring steel;
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services featuring steel plates and sheets; retail store
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services featuring frames of metal for building; retail
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wholesale store services featuring rebars for construction
(other than those unwrought or semi-wrought); retail store
services featuring rebars for construction (other than those
unwrought or semi-wrought); wholesale store services
featuring construction materials of metal; retail store
services featuring construction materials of metal;
wholesale store services featuring refractory construction
materials of metal; retail store services featuring
refractory construction materials of metal; wholesale store
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featuring mould steel; wholesale store services featuring
cold rolling steel tubes; retail store services featuring
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cold rolling mould steel; retail store services featuring
cold rolling mould steel; wholesale store services featuring
cold rolling rebar, unwrought or semi-wrought; retail store
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retail store services featuring iron, unwrought or
semi-wrought; wholesale store services featuring rebar,
unwrought or semi-wrought; retail store services featuring
rebar, unwrought or semi-wrought; wholesale store services
featuring construction materials, not of metal; retail store
services featuring construction materials, not of metal;
wholesale store services featuring hot-rolled steel tubes;
retail store services featuring hot-rolled steel tubes;
wholesale store services featuring hot-rolled mould steel;
retail store services featuring hot-rolled mould steel;
wholesale store services featuring hot-rolled rebar,
unwrought or semi-wrought; retail store services featuring
hot-rolled rebar, unwrought or semi-wrought; wholesale store
services featuring hot-rolled plastic moulding steel; retail
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intermediary services relating to mail order by
telecommunications; wholesale store services featuring
finishing preparations for use in the manufacture of steel;
retail store services featuring finishing preparations for
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60.
HOT-STAMPED COMPONENT AND METHOD FOR MANUFACTURING SAME
A hot-stamped component according to an embodiment of the present disclosure includes a steel sheet, a plating layer located on the steel sheet and including Zn, and a surface layer located on the plating layer, wherein the surface layer includes a post-treatment layer including an Si-based inorganic post-treatment agent, a Zn oxide layer located on a same layer as the post-treatment layer on the plating layer, and an inter-diffusion layer located between the plating layer and at least one of the post-treatment layer and the Zn oxide layer to overlap at least one of the post-treatment layer and the Zn oxide layer, the inter-diffusion layer including at least one of Si, Mn, O, Fe, Zn, and SiO.
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron
C23C 8/00 - Solid state diffusion of only non-metal elements into metallic material surfacesChemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
61.
HOT ROLLED STEEL SHEET, PART FOR VEHICLE, AND METHOD FOR MANUFACTURING SAME
A method for manufacturing a hot rolled steel sheet according to an embodiment of the present invention comprises the steps of: preparing molten metal using raw materials including molten iron produced in a blast furnace, direct reduction iron, and iron scrap; manufacturing a semi-finished product; and manufacturing a hot rolled steel sheet.
B21B 1/38 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-sectionSequence of operations in milling trainsLayout of rolling-mill plant, e.g. grouping of standsSuccession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
B21D 53/88 - Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
B21C 47/24 - Transferring coils to or from winding apparatus or to or from operative position thereinPreventing uncoiling during transfer
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
B21B 1/22 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-sectionSequence of operations in milling trainsLayout of rolling-mill plant, e.g. grouping of standsSuccession of passes or of sectional pass alternations for rolling bands or sheets of indefinite length
62.
HOT ROLLED STEEL SHEET, PART FOR VEHICLE, AND METHOD FOR MANUFACTURING SAME
A method for manufacturing a hot rolled steel sheet according to one embodiment of the present invention comprises the steps of: preparing molten metal by using raw materials including molten iron produced in a blast furnace, direct reduction iron, and iron scrap; manufacturing a semi-finished product; and manufacturing a hot rolled steel sheet.
C23C 22/07 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing phosphates
63.
PLATED STEEL SHEET AND MANUFACTURING METHOD THEREFOR
The present invention provides a plated steel sheet comprising: a cold rolled steel sheet; a plating layer formed on the cold rolled steel sheet; 0.5-3 wt% of aluminum (Al); 1-2 wt% of magnesium (Mg), 0.005-0.1 wt% of silicon (Si); 0.01-0.1 wt% of titanium (Ti); and the balance of zinc (Zn) and other inevitable impurities, wherein the content ratio of titanium and silicon is 1.0 or greater in the plating layer, and the plating layer comprises an intermetallic compound containing titanium.
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services featuring frames of metal for building; retail
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services featuring rebars for construction (other than those
unwrought or semi-wrought); wholesale store services
featuring construction materials of metal; retail store
services featuring construction materials of metal;
wholesale store services featuring refractory construction
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refractory construction materials of metal; wholesale store
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featuring mould steel; wholesale store services featuring
cold rolling steel tubes; retail store services featuring
cold rolling steel tubes; wholesale store services featuring
cold rolling mould steel; retail store services featuring
cold rolling mould steel; wholesale store services featuring
cold rolling rebar, unwrought or semi-wrought; retail store
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rolling plastic moulding steel; retail store services
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retail store services featuring iron, unwrought or
semi-wrought; wholesale store services featuring rebar,
unwrought or semi-wrought; retail store services featuring
rebar, unwrought or semi-wrought; wholesale store services
featuring construction materials, not of metal; retail store
services featuring construction materials, not of metal;
wholesale store services featuring hot-rolled steel tubes;
retail store services featuring hot-rolled steel tubes;
wholesale store services featuring hot-rolled mould steel;
retail store services featuring hot-rolled mould steel;
wholesale store services featuring hot-rolled rebar,
unwrought or semi-wrought; retail store services featuring
hot-rolled rebar, unwrought or semi-wrought; wholesale store
services featuring hot-rolled plastic moulding steel; retail
store services featuring hot-rolled plastic moulding steel;
promoting the goods and services of others by means of
operating an on-line comprehensive shopping mall; business
intermediary services relating to mail order by
telecommunications; wholesale store services featuring
finishing preparations for use in the manufacture of steel;
retail store services featuring finishing preparations for
use in the manufacture of steel; wholesale store services
featuring plastic moulding steel; retail store services
featuring plastic moulding steel.
65.
METHOD FOR MANUFACTURING NON-ORIENTED ELECTRICAL STEEL SHEET WITH EXCELLENT MAGNETIC PROPERTIES, AND NON-ORIENTED ELECTRICAL STEEL SHEET MANUFACTURED THEREBY
Disclosed is an invention concerning a method for manufacturing non-oriented electrical steel sheets with excellent magnetic properties and the non-oriented electrical steel sheets produced thereby. In a specific embodiment, the method for manufacturing non-oriented electrical steel sheets with excellent magnetic properties includes the steps of: manufacturing a hot-rolled steel sheet using a slab containing 0.4-3.5 wt% of silicon (Si), 0 (exclusive) to 0.05 wt% (inclusive) of aluminum (Al), 0.002-3.5 wt% of austenite stabilizing elements, and the balance of iron (Fe) and other inevitable impurities; cold rolling the hot-rolled steel sheet to prepare a cold-rolled steel sheet; and cold-annealing the cold-rolled steel sheet, wherein the cold-annealing includes a primary heat treatment step of heating and maintaining the cold-rolled steel sheet up to the temperature of the austenite single-phase region; and a secondary heat treatment step of cooling and maintaining the primary heat-treated cold-rolled steel sheet down to the temperature of the ferrite and austenite dual-phase region.
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
According to an exemplary embodiment of the present disclosure, disclosed is an aluminum coated blank that includes a first coated steel sheet; a second coated steel sheet connected to the first coated steel sheet; and a joint portion that connects the first coated steel sheet to the second coated steel plate at a boundary between the first coated steel sheet and the second coated steel sheet.
A hot stamping component according to an embodiment of the present disclosure includes a steel sheet, a plating layer located on the steel sheet and including Zn, and a surface layer located on the plating layer, wherein the surface layer includes a post-treatment layer including an Si-based inorganic post-treatment agent, a Zn oxide layer located on a same layer as the post-treatment layer on the plating layer, and an inter-diffusion layer located between the plating layer and at least one of the post-treatment layer and the Zn oxide layer to overlap at least one of the post-treatment layer and the Zn oxide layer, the inter-diffusion layer including at least one of Si, Mn, O, Fe, Zn, and SiO, wherein a tensile strength of the steel sheet is 1680 MPa or more.
A method for manufacturing a hot rolled steel sheet according to an embodiment of the present invention comprises the steps of: manufacturing a molten metal; manufacturing a semi-finished product; and manufacturing a hot rolled steel sheet. A raw material of the molten metal comprises X wt% of molten iron, Y wt% of direct reduced iron, and Z wt% of iron scrap, the hot rolled steel sheet comprises K1 wt% or less of copper (Cu), and X, Y, Z, and K1 satisfy formula 1 and formula 2. [Formula 1] (a1 × X + a2 × Y + a3 × Z)/(X +Y + Z) = K1 [Formula 2] K1 ≤ 0.12
A method for manufacturing a steel section, according to an embodiment of the present invention, comprises the steps of: (a) reheating steel to 1150-1300 °C, the steel comprising 0.04-0.14 wt% of carbon (C), 0.10-0.55 wt% of silicon (Si), 0.90-1.65 wt% of manganese (Mn), 0.020 wt% or less of phosphorus (P), 0.007 wt% or less of sulfur (S), 0.015-0.055 wt% of aluminum (Al), 0.010-0.080 wt% of vanadium (V), 0.005-0.025 wt% of titanium (Ti), 0.010-0.050 wt% of niobium (Nb), and the remainder of iron (Fe) and other inevitable impurities; and (b) rolling the steel, wherein the rolling start temperature is 900-1100 °C, the rolling medium temperature is 850-1000 °C, and the rolling end temperature is 800-900 °C. Accordingly, it is possible to realize a high-performance steel section which achieves uniform physical properties while securing low-temperature impact toughness and a method for manufacturing the steel section.
A steel section manufacturing method, according to one embodiment of the present invention, comprises the steps of: (a) reheating steel at a temperature of 1200°C or higher, the steel comprising 0.17% by weight or less of carbon (C), 1.6% by weight or less of manganese (Mn), 0.10-0.35% by weight of chromium (Cr), 0.15% by weight or less of molybdenum (Mo), 0.05% by weight or less of niobium (Nb), 0.003% by weight or less of boron (B), 0.04% by weight or less of titanium (Ti), and the remainder being iron (Fe) and other inevitable impurities; (b) hot rolling the steel and controlling the rolling start temperature to 1050-1100°C and the rolling end temperature to 860-930°C; and (c) water cooling the steel. Thereby, it is possible to implement a high-performance steel section and a steel section manufacturing method which simultaneously have earthquake-resistant performance and fire-resistant performance.
A steelmaking method according to an embodiment of the present invention comprises the steps of: introducing a first raw material into a blast furnace to produce pig iron; introducing a second raw material into an electric arc furnace to produce a first molten steel; and introducing the pig iron, the first molten steel, and steel scraps into a converter to produce a second molten steel. The amount (K) of carbon dioxide emitted during the production of one ton of the second molten steel is defined by expression 1. The amount (K) of carbon dioxide emitted during the production of one ton of the second molten steel satisfies expression 2. [Expression 1] the amount (K) of carbon dioxide emitted during the production of one ton of the second molten steel = α×X+β×Y+γ×Z [Expression 2] the amount (K) of carbon dioxide emitted during the production of one ton of the second molten steel < α
C22C 38/48 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
C21D 7/13 - Modifying the physical properties of iron or steel by deformation by hot working
C21D 8/00 - Modifying the physical properties by deformation combined with, or followed by, heat treatment
C21D 9/32 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for gear wheels, worm wheels, or the like
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
C22C 38/46 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
(1) Wholesale store services featuring steel tubes; retail store services featuring steel tubes; wholesale store services featuring balls of steel; retail store services featuring balls of steel; wholesale store services featuring steel; retail store services featuring steel; wholesale store services featuring steel plates and sheets; retail store services featuring steel plates and sheets; wholesale store services featuring frames of metal for building; retail store services featuring frames of metal for building; wholesale store services featuring rebars for construction (other than those unwrought or semi-wrought); retail store services featuring rebars for construction (other than those unwrought or semi-wrought); wholesale store services featuring construction materials of metal; retail store services featuring construction materials of metal; wholesale store services featuring refractory construction materials of metal; retail store services featuring refractory construction materials of metal; wholesale store services featuring mould steel; retail store services featuring mould steel; wholesale store services featuring cold rolling steel tubes; retail store services featuring cold rolling steel tubes; wholesale store services featuring cold rolling mould steel; retail store services featuring cold rolling mould steel; wholesale store services featuring cold rolling rebar, unwrought or semi-wrought; retail store services featuring cold rolling rebar, unwrought or semi-wrought; wholesale store services featuring cold rolling plastic moulding steel; retail store services featuring cold rolling plastic moulding steel; wholesale store services featuring iron, unwrought or semi-wrought; retail store services featuring iron, unwrought or semi-wrought; wholesale store services featuring rebar, unwrought or semi-wrought; retail store services featuring rebar, unwrought or semi-wrought; wholesale store services featuring construction materials, not of metal; retail store services featuring construction materials, not of metal; wholesale store services featuring hot-rolled steel tubes; retail store services featuring hot-rolled steel tubes; wholesale store services featuring hot-rolled mould steel; retail store services featuring hot-rolled mould steel; wholesale store services featuring hot-rolled rebar, unwrought or semi-wrought; retail store services featuring hot-rolled rebar, unwrought or semi-wrought; wholesale store services featuring hot-rolled plastic moulding steel; retail store services featuring hot-rolled plastic moulding steel; promoting the goods and services of others by means of operating an on-line comprehensive shopping mall; business intermediary services relating to mail order by telecommunications; wholesale store services featuring finishing preparations for use in the manufacture of steel; retail store services featuring finishing preparations for use in the manufacture of steel; wholesale store services featuring plastic moulding steel; retail store services featuring plastic moulding steel.
Wholesale store services featuring steel tubes; retail store services featuring steel tubes; wholesale store services featuring balls of steel; retail store services featuring balls of steel; wholesale store services featuring steel; retail store services featuring steel; wholesale store services featuring steel plates and sheets; retail store services featuring steel plates and sheets; wholesale store services featuring frames of metal for building; retail store services featuring frames of metal for building; wholesale store services featuring rebars for construction, other than those unwrought or semiwrought; retail store services featuring rebars for constructionother than those unwrought or semiwrought; wholesale store services featuring construction materials of metal; retail store services featuring construction materials of metal; wholesale store services featuring refractory construction materials of metal; retail store services featuring refractory construction materials of metal; wholesale store services featuring mould steel; retail store services featuring mould steel; wholesale store services featuring cold rolling steel tubes; retail store services featuring cold rolling steel tubes; wholesale store services featuring cold rolling mould steel; retail store services featuring cold rolling mould steel; wholesale store services featuring cold rolling rebar, unwrought or semi-wrought; retail store services featuring cold rolling rebar, unwrought or semi-wrought; wholesale store services featuring cold rolling plastic moulding steel; retail store services featuring cold rolling plastic moulding steel; wholesale store services featuring iron, unwrought or semi-wrought; retail store services featuring iron, unwrought or semi-wrought; wholesale store services featuring rebar, unwrought or semi-wrought; retail store services featuring rebar, unwrought or semi-wrought; wholesale store services featuring construction materials, not of metal; retail store services featuring construction materials, not of metal; wholesale store services featuring hot-rolled steel tubes; retail store services featuring hot-rolled steel tubes; wholesale store services featuring hot-rolled mould steel; retail store services featuring hot-rolled mould steel; wholesale store services featuring hot-rolled rebar, unwrought or semi-wrought; retail store services featuring hot-rolled rebar, unwrought or semi-wrought; wholesale store services featuring hot-rolled plastic moulding steel; retail store services featuring hot-rolled plastic moulding steel; promoting the goods and services of others by means of operating an on-line comprehensive shopping mall; business intermediary services in the nature of commercial assistance in business management relating to mail order by telecommunications;wholesale store services featuring finishing preparations for use in the manufacture of steel; retail store services featuring finishing preparations for use in the manufacture of steel; wholesale store services featuring plastic moulding steel; retail store services featuring plastic moulding steel
75.
NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR
The present invention provides a method for manufacturing a non-oriented electrical steel sheet, the method comprising the steps of: hot rolling a slab containing, by weight%, carbon (C): 0% (exclusive) to 0.005% (inclusive), silicon (Si): 2.0% to 4.0% (both inclusive), manganese (Mn): 0.1% to 0.5% (both inclusive), aluminum (Al): 0.9% to 1.5% (both inclusive), phosphorus (P): 0% (exclusive) to 0.015% (inclusive), sulfur (S): 0% (exclusive) to 0.005% (inclusive), nitrogen (N):0% (exclusive) to 0.005% (inclusive), titanium (Ti): 0% (exclusive) to 0.005% (inclusive), the balance being iron (Fe) and inevitable impurities; preliminarily annealing the hot-rolled sheet; cold rolling the preliminarily annealed, hot-rolled sheet; and cold annealing the cold-rolled sheet, the cold annealing step including a first heating stage, a second heating stage, and a soaking stage, wherein the cold-rolled sheet is heated from the start temperature to the recrystallization temperature at a first average heating rate in the first heating stage and from the recrystallization temperature to the target temperature at a second average heating rate faster than the first average heating rate in the second heating stage.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
H01F 1/147 - Alloys characterised by their composition
76.
ULTRAHIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
The present invention provides an ultrahigh-strength steel sheet, which comprises, by weight%, 0.1% to 0.30% of carbon (C), 1.0% to 2.0% of silicon (Si), 1.5% to 3.0% of magnesium (Mg), 0% (exclusive) to 0.05% of aluminum (Al), 0% (exclusive) to 0.05% of the sum of any one or more selected from niobium (Nb), titanium (Ti) and vanadium (V), 0% (exclusive) to 0.02% of phosphorus (P), 0% (exclusive) to 0.005% of sulfur (S), 0% (exclusive) to 0.006% of nitrogen (N), and the balance being iron (Fe) and unavoidable impurities and has a final microstructure composed of tempered martensite, martensite, pearlite, and retained austenite, with a yield point (YP) of 850 Mpa or higher, a tensile strength (TS) of 1180 MPa or higher, and an elongation index (EI) of 14% or more.
A method for manufacturing steel according to an embodiment of the present invention comprises the steps of: preparing a first molten metal manufactured using a first raw material including iron ore and a second molten metal manufactured using a second raw material including iron scrap; mixing the first molten metal and the second molten metal to manufacture a third molten metal; adjusting components of the third molten metal to manufacture a fourth molten metal; and manufacturing a product by processing the fourth molten metal.
The present invention provides a method for manufacturing a non-oriented electrical steel sheet, comprising the steps of: preparing a slab comprising, by wt%, carbon (C) in an amount greater than 0% and less than or equal to 0.002%, 2.3-2.8% of silicon (Si), 0.2-0.28% of manganese (Mn), 0.32-0.45% of aluminum (Al), phosphorus (P) in an amount greater than 0% and less than or equal to 0.015%, sulfur (S) in an amount greater than 0% and less than or equal to 0.002%, nitrogen (N) in an amount greater than 0% and less than or equal to 0.002%, titanium (Ti) in an amount greater than 0% and less than or equal to 0.002%, and the balance of iron (Fe) and inevitable impurities; hot rolling the slab, thereby forming a hot rolled sheet; pre-annealing the hot rolled sheet, thereby forming a hot annealed sheet; cold rolling the hot annealed sheet, thereby forming a cold rolled sheet; and cold annealing the cold rolled sheet, thereby forming a cold annealed sheet, wherein Mn and Al, which are contained in the slab, satisfy relation 1 (0.10 ≤ 1.3 x [Mn] - 0.46 x [Al] ≤ 0.18).
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
H01F 1/147 - Alloys characterised by their composition
79.
ULTRA-HIGH STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
The present invention provides a cold-rolled steel sheet comprising 0.23-0.35 wt% of carbon (C), 0.05-0.5 wt% of silicon (Si), 0.3-2.3 wt% of manganese (Mn), 0-0.02 wt% (exclusive of 0) of phosphorus (P), 0-0.005 wt% (exclusive of 0) of sulfur (S), 0.01-0.05 wt% of aluminum (Al), 0-0.8 wt% (exclusive of 0) of chromium (Cr), 0-0.4 wt% (exclusive of 0) of molybdenum (Mo), 0.01-0.1 wt% of titanium (Ti), 0-0.3 wt% (exclusive of 0) of vanadium (V), and 0.001-0.005 wt% of boron (B), with the balance being iron (Fe) and other inevitable impurities, wherein the final microstructure of the cold-rolled steel sheet includes cementite, transition carbides, and fine precipitates, the transition carbides including ε-carbide, in which the atomic ratio of a substitutional element, which is one of Fe, Mn, Cr, or Mo, to carbon is 2.5:1, or η-carbide, in which the atomic ratio is 2:1.
(1) Wholesale store services featuring steel tubes; retail store services featuring steel tubes; wholesale store services featuring balls of steel; retail store services featuring balls of steel; wholesale store services featuring steel; retail store services featuring steel; wholesale store services featuring steel plates and sheets; retail store services featuring steel plates and sheets; wholesale store services featuring frames of metal for building; retail store services featuring frames of metal for building; wholesale store services featuring rebars for construction (other than those unwrought or semi-wrought); retail store services featuring rebars for construction (other than those unwrought or semi-wrought); wholesale store services featuring construction materials of metal; retail store services featuring construction materials of metal; wholesale store services featuring refractory construction materials of metal; retail store services featuring refractory construction materials of metal; wholesale store services featuring mould steel; retail store services featuring mould steel; wholesale store services featuring cold rolling steel tubes; retail store services featuring cold rolling steel tubes; wholesale store services featuring cold rolling mould steel; retail store services featuring cold rolling mould steel; wholesale store services featuring cold rolling rebar, unwrought or semi-wrought; retail store services featuring cold rolling rebar, unwrought or semi-wrought; wholesale store services featuring cold rolling plastic moulding steel; retail store services featuring cold rolling plastic moulding steel; wholesale store services featuring iron, unwrought or semi-wrought; retail store services featuring iron, unwrought or semi-wrought; wholesale store services featuring rebar, unwrought or semi-wrought; retail store services featuring rebar, unwrought or semi-wrought; wholesale store services featuring construction materials, not of metal; retail store services featuring construction materials, not of metal; wholesale store services featuring hot-rolled steel tubes; retail store services featuring hot-rolled steel tubes; wholesale store services featuring hot-rolled mould steel; retail store services featuring hot-rolled mould steel; wholesale store services featuring hot-rolled rebar, unwrought or semi-wrought; retail store services featuring hot-rolled rebar, unwrought or semi-wrought; wholesale store services featuring hot-rolled plastic moulding steel; retail store services featuring hot-rolled plastic moulding steel; promoting the goods and services of others by means of operating an on-line comprehensive shopping mall; business intermediary services relating to mail order by telecommunications; wholesale store services featuring finishing preparations for use in the manufacture of steel; retail store services featuring finishing preparations for use in the manufacture of steel; wholesale store services featuring plastic moulding steel; retail store services featuring plastic moulding steel.
Wholesale store services featuring steel tubes; retail store services featuring steel tubes; wholesale store services featuring balls of steel; retail store services featuring balls of steel; wholesale store services featuring steel; retail store services featuring steel; wholesale store services featuring steel plates and sheets; retail store services featuring steel plates and sheets; wholesale store services featuring frames of metal for building; retail store services featuring frames of metal for building; wholesale store services featuring rebars for construction, other than those unwrought or semiwrought; retail store services featuring rebars for construction, other than those unwrought or semiwrought; wholesale store services featuring construction materials of metal; retail store services featuring construction materials of metal; wholesale store services featuring refractory construction materials of metal; retail store services featuring refractory construction materials of metal; wholesale store services featuring mould steel; retail store services featuring mould steel; wholesale store services featuring cold rolling steel tubes; retail store services featuring cold rolling steel tubes; wholesale store services featuring cold rolling mould steel; retail store services featuring cold rolling mould steel; wholesale store services featuring cold rolling rebar, unwrought or semi-wrought; retail store services featuring cold rolling rebar, unwrought or semi-wrought; wholesale store services featuring cold rolling plastic moulding steel; retail store services featuring cold rolling plastic moulding steel; wholesale store services featuring iron, unwrought or semi-wrought; retail store services featuring iron, unwrought or semi-wrought; wholesale store services featuring rebar, unwrought or semi-wrought; retail store services featuring rebar, unwrought or semi-wrought; wholesale store services featuring construction materials, not of metal; retail store services featuring construction materials, not of metal; wholesale store services featuring hot-rolled steel tubes; retail store services featuring hot-rolled steel tubes; wholesale store services featuring hot-rolled mould steel; retail store services featuring hot-rolled mould steel; wholesale store services featuring hot-rolled rebar, unwrought or semi-wrought; retail store services featuring hot-rolled rebar, unwrought or semi-wrought; wholesale store services featuring hot-rolled plastic moulding steel; retail store services featuring hot-rolled plastic moulding steel; promoting the goods and services of others by means of operating an on-line comprehensive shopping mall; business intermediary services in the nature of commercial assistance in business management relating to mail order by telecommunications; wholesale store services featuring finishing preparations for use in the manufacture of steel; retail store services featuring finishing preparations for use in the manufacture of steel; wholesale store services featuring plastic moulding steel; retail store services featuring plastic moulding steel.
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Processing of steel; rolling of steel; heat treating of
steel; cutting of steel; shearing of steel; cutting of steel
sheets; processing of light metals; metal stamping; heat
treating of metals; heat treatment of metals; cutting of
metals; milling of metal; metallurgical smelting; metal
fabrication and finishing services; metal treating; surface
treatment or processing for metals; electro and metal
coating, metal treating and casting, hardening of metal and
metal products; hardening of metals; machining of metals;
metal tempering; metal plating; processing of metal parts;
metal plastic processing; metallizing; shaping of metal
components; surface finishing of metal articles; metal
casting; metal mold casting; abrasive polishing of metal
surfaces; heat treatment of metal surfaces; treatment and
coating of metal surfaces; treatment of aluminum;
blacksmithing.
The present invention provides a hot-stamped component comprising a base steel sheet comprising 0.15-0.27 wt% of carbon (C), 0.15-1.0 wt% of silicon (Si), 0.5-1.10 wt% of manganese (Mn), 0.018 wt% or less of phosphorus (P), 0.005 wt% or less of sulfur (S), 0.1-1.0 wt% of chromium (Cr), 0.1-1.0 wt% of aluminum (Al), 0.015-0.080 wt% of titanium (Ti), 0.015-0.080 wt% of niobium (Nb), 0.1-0.7 wt% of molybdenum (Mo), 0.001-0.008 wt% of boron (B), 0.005 wt% or less of nitrogen (N), and the remainder of iron (Fe) and other unavoidable impurities, wherein the base steel sheet has a martensite structure, and the martensite structure has a nanoindentation hardness of 3.0-5.0 GPa with a standard deviation of 0.8 GPa or less.
The present invention provides a method for manufacturing a hot stamping part, the method comprising: a preparation step for preparing a blank; a heating step for heating the blank; a transfer step for transferring the heated blank to a press mold; a molding and first piercing step for molding at least two holes in the transferred blank; and a trimming step for cutting the outer portion of the molded blank by using the at least two holes.
Disclosed is a vehicle battery case including: a case body in which a vehicle battery is contained; and a side portion extending in a longitudinal direction of a vehicle and coupled to a side of the case body, thereby protecting a side of the vehicle battery. The side portion includes: a lower panel extending outwards from the case body and having multiple first protrusions formed to protrude upwards; an upper panel disposed above the lower panel and extending outwards from the case body so as to form a closed section together with the lower panel; and a reinforcement panel disposed between the upper panel and the lower panel so as to extend outwards from the case body, thereby reinforcing rigidity of the side portion together with the lower panel and the upper panel.
B60K 1/04 - Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
H01M 50/242 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
H01M 50/249 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders specially adapted for aircraft or vehicles, e.g. cars or trains
86.
MULTI-STAGE PRESS-MOLDING METHOD FOR SHEET MATERIAL, AND MOLD DEVICE FOR MOLDING SHEET MATERIAL
The present invention relates to a method and a device for molding a sheet material into a hat type which protrudes a predetermined height from a floor surface and which has a flat surface on the top thereof, and the method may comprise the steps of: (S1) molding a sheet material into the shape a protrusion having a curved surface at the top thereof, so that the sheet material has a uniform thickness reduction ratio; (S2) forming both end edge parts by moving, left and right, the sheet material in the center thereof so that the protrusion has a flat surface; and (S3) forming the flat surface by correcting the protruding portions of both the end edge parts such that same become flat.
A non-oriented electrical steel sheet according to an embodiment of the present invention is a non-oriented electrical steel sheet comprising: more than 0 and equal to or less than 0.003 wt% of carbon (C); 2.0-4.0 wt% of silicon (Si); 0.1-0.5 wt% of manganese (Mn); 0.3-0.9 wt% of aluminum (Al); more than 0 and equal to or less than 0.015 wt% of phosphorus (P); more than 0 and equal to or less than 0.003 wt% of sulfur (S); more than 0 and equal to or less than 0.003 wt% of nitrogen (N); more than 0 and equal to or less than 0.003 wt% of titanium (Ti); and the remainder of Fe and other inevitable impurities, and the final microstructure satisfies formula 1: Formula 1: 0.00172[A] - 0.0266[B] < 2.0 (wherein [A] is the average number of secondary phase particles in a steel sheet cross-section with an area of 10 x 10 mm2, and [B] is a volume fraction value of particles with an average size of 2 ㎛ or more among the secondary phase particles (unit: %)).
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
H01F 1/147 - Alloys characterised by their composition
88.
NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
The present invention provides a non-oriented electric steel sheet comprising 2.8 to 3.8 wt% of silicon (Si), 0.2 to 0.5 wt% of manganese (Mn), 0.5 to 1.2 wt% of aluminum (Al), 0 (exclusive) to 0.002 wt% of carbon (C), 0 (exclusive) to 0.015 wt% of phosphorus (P), 0 (exclusive) to 0.002 wt% of sulfur (S), 0 (exclusive) to 0.002 wt% of nitrogen (N), 0 (exclusive) to 0.002 wt% of titanium (Ti), and the balance being iron (Fe) and other unavoidable impurities, wherein in the final microstructure, grains of {111}//ND orientation have a volume fraction of 30% or less and an average misorientation angle of 23° or greater, and grains of {001}//ND orientation have a volume fraction of 15% or more and an average misorientation angle of 48° or greater.
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
H01F 1/147 - Alloys characterised by their composition
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Metal treatment, namely, processing of steel; rolling of steel, namely, custom steel rolling and fabrication to the order and specification of others; heat treating of steel; cutting of steel; Metal treatment, namely, shearing of steel; cutting of steel sheets;Metal treatment, namely, processing of light metals; metal stamping; heat treating of metals; heat treatment of metals; cutting of metals; Metal treatment, namely, milling of metal; Metal treatment, namely, metallurgical smelting; metal fabrication and finishing services for others; metal treating;Metal treatment, namely, surface treatment or processing for metals;electro and metal coating in the nature of applying decorative and protective coatings to metal by means of galvanization; metal treating and casting, hardening of metal and metal products; hardening of metals;Metal treatment, namely, machining of metals; metal tempering; metal plating; Metal treatment, namely, processing of metal parts; Metal treatment, namely,metal plastic processing; metallizing; shaping of metal components, namely, cold forming of metal; surface finishing of metal articles; metal casting; metal mold casting;Metal treatment, namely, abrasive polishing of metal surfaces; heat treatment of metal surfaces; treatment and coating of metal surfaces in the nature of powder coating services, electrophoretic coating, applying decorative and protective coatings to metal by means of galvanization; treatment of aluminum; blacksmithing; none of the aforesaid services being or including galvanizing services.
91.
COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
The present invention provides a cold-rolled steel sheet comprising 0.23-0.35 wt% of carbon (C), 0.05-0.5 wt% of silicon (Si), 0.3-2.3 wt% of manganese (Mn), greater than 0 and less than or equal to 0.02 wt% of phosphorus (P), greater than 0 and less than or equal to 0.005 wt% of sulfur (S), 0.01-0.05 wt% of aluminum (Al), greater than 0 and less than or equal to 0.8 wt% of chromium (Cr), greater than 0 and less than or equal to 0.4 wt% of molybdenum (Mo), 0.01-0.1 wt% of titanium (Ti), 0.001-0.005 wt% of boron (B), and the remainder of iron (Fe) and other inevitable impurities, wherein the final microstructure of the cold-rolled steel sheet includes cementite, transition carbide, and fine precipitates, the transition carbide includes an ε-carbide having an atomic ratio of a substitutional element to carbon of 2.5:1 or a η-carbide having an atomic ratio of a substitutional element to carbon of 2:1, the substitutional element being any one of Fe, Mn, Cr, or Mo, and the fine precipitates have an atomic ratio of an alloying element to carbon of 1:1, the alloying element being any one of Mo or Ti.
A method for manufacturing a non-oriented electrical steel sheet according to one embodiment of the present invention comprises the steps of: providing a steel material containing silicon (Si), manganese (Mn), and aluminum (Al); hot-rolling the steel material; performing a first heat treatment before winding the hot-rolled steel material; winding the first heat-treated steel; uncoiling and cold-rolling the wound steel material; and annealing the cold-rolled steel material.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
The present invention relates to a fuel cell bipolar plate having corrosion resistance and high conductivity, and a fuel cell bipolar plate coating method, and provides a fuel cell bipolar plate comprising: a metal substrate; and a coating layer which is formed on the metal substrate, and which is composed of a mixture of a binder resin and a filler comprising a flake-like carbon material and a granular carbon material, wherein the filler is encompassed by the binder resin so as to be dispersed inside the coating layer, and the filler is exposed to the outside on the surface of the coating layer.
The present invention relates to an injection system of an electric furnace and an electric furnace including same, and may comprise: a powder carbon spray nozzle for spraying a transfer fluid containing powder carbon to an electric furnace body; a film cooling fluid nozzle formed to surround the powder carbon spray nozzle and configured to spray film cooling fluid toward the powder carbon spray nozzle; a supersonic oxygen nozzle formed to surround the film cooling fluid nozzle and configured to spray supersonic oxygen to the electric furnace body; and a fuel nozzle formed to surround the supersonic oxygen nozzle and configured to spray fuel to the electric furnace body.
The present invention provides an ultra-high strength cold-rolled steel sheet having high strength and elongation through the control of microstructures and a manufacturing method therefor. According to an embodiment of the present invention, the ultra-high strength cold-rolled steel sheet comprises, in weight%, 0.28% to 0.45% of carbon (C), 1.0% to 2.5% of silicon (Si), 1.5% to 3.0% of manganese (Mn), 0.01% to 0.05% of aluminum (Al), 0% (exclusive) to 1.0% (inclusive) of chromium (Cr), 0% (exclusive) to 0.5% (inclusive) of molybdenum (Mo), 0% (exclusive) to 0.1% (inclusive) of niobium (Nb), titanium (Ti), and vanadium (V) in total, 0% (exclusive) to 0.03% (inclusive) of phosphorous (P), 0% (exclusive) to 0.03% (inclusive) of sulfur (S), 0% (exclusive) to 0.01% (inclusive) of nitrogen (N), and the balance being iron (Fe) and other inevitable impurities, and satisfies a yield strength (YP) of 1180 MPa or more, a tensile strength (TS) of 1470 MPa or more, an elongation (El) of 15% or more, a yield ratio (YR) of 75% or more, and a bendability (R/t) of 3.0 or less.
An ultra-high strength cold-rolled steel sheet of the present invention comprises, in weight%, 0.23% to 0.40% of carbon (C), 0.05% to 1.0% of silicon (Si), 0.5% to 3.0% of manganese (Mn), 0.01% to 0.12% of vanadium (V), 0.01% to 0.3% of aluminum (Al), 0% (exclusive) to 0.5% (inclusive) of chromium (Cr), 0% (exclusive) to 0.1% (inclusive) of titanium (Ti), 0% (exclusive) to 0.02% (inclusive) of phosphorus (P), 0% (exclusive) to 0.01% (inclusive) of sulfur (S), 0.001% to 0.005% of boron (B), and the balance being iron (Fe) and other inevitable impurities, wherein the final microstructure of the steel sheet comprises tempered martensite with a volume fraction of 90% or more; the average separation distance between precipitates in the tempered martensite is 300 nm or longer; the average size of the precipitates is 200 nm or smaller; and the number of precipitates with an average size of 40 nm or smaller on the basis of an area of 20 ㎛2 in the final microstructure is 25 or more.
The present invention relates to a hot stamping component, and provides a hot stamping component comprising: a base metal; a decarburization layer arranged on the base metal; and an internal oxide layer arranged on the decarburization layer, wherein the hot stamping component has a tensile strength (TS) of 1,350-1,680 MPa, and the hardness within 50 μm depth from the surface of the hot stamping component in the sheet thickness direction of the hot stamping component and the average hardness of the hot stamping component satisfy the following relation 1. (A/B) ≤ 0.7 (In relation 1, A is the hardness (Hv(≤50 μm)) within 50 μm depth in the sheet thickness direction of the hot stamping component, and B is the average hardness (Hv(avg.)) of the hot stamping component.)
Provided is a snout control system comprising: a snout apparatus in which one end of a steel sheet is immersed in a plating bath, containing a hot-dip galvanizing solution for plating the steel sheet, to introduce the steel sheet into the plating bath during the production process of a hot-dip galvanized steel sheet; a first sensor which is formed on a portion of the plating bath and can measure the first water level of the molten steel of the hot-dip galvanizing solution; and a processor which controls the snout apparatus and the first sensor.
The present invention relates to an electric furnace having double melting furnaces. The electric furnace may comprise: a first upper cell forming a first upper space of a first melting furnace in which a first iron source is inputted and dissolved; a second upper cell forming a second upper space of a second melting furnace in which a second iron source is inputted and dissolved; a lower cell coupled to the lower portions of the first upper cell and the second upper cell so as to enable a first lower space of the first melting furnace and a second lower space of the second melting furnace to be formed into one integrated space; and a partition unit installed between the first upper cell and the second upper cell so as to be vertically movable, thereby separating the first lower space of the first melting furnace and the second lower space of the second melting furnace which are formed so as to be integrated by means of the lower cell.
According to one aspect of the present invention, provided is a hot stamping part comprising a steel sheet that includes: 0.26-0.40 wt% of carbon (C); 0.02-2.0 wt% of silicon (Si); 0.3-1.60 wt% of manganese (Mn); at most 0.03 wt% of phosphorus (P); at most 0.008 wt% of sulfur (S); 0.05-0.90 wt% of chromium (Cr); 0.0005-0.01 wt% of boron (B); 0.05-0.2 wt% of molybdenum (Mo); 0.001-0.095 wt% of titanium (Ti); 0.001-0.095 wt% of niobium (Nb); and 0.001-0.095 wt% of vanadium (V), with the balance being iron (Fe) and other inevitable impurities, and has a tensile strength of at least 1,700 MPa and a yield strength of at least 1,150 MPa, wherein the hot stamping part has a microstructure containing austenite grains and includes a carbon-based precipitate containing at least one among niobium (Nb), titanium (Ti), molybdenum (Mo), and vanadium (V), and the average size of the austenite grains is at most 15 µm.
