According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected zone, and a manufacturing method therefor can be provided.
The present disclosure relates to a calcium-containing graphite steel wire rod, a steel wire, a graphite steel, and a manufacturing and cutting method thereof, and more particularly, to a cutting method for manufacturing industrial parts, a graphite steel wire rod, a graphite steel, and a manufacturing method therefor.
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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
The present disclosure relates to methods for manufacturing a wire rod for cold forging and a screw part, which may manufacture with only quenching heat treatment a part with excellent drilling characteristics, and which may specifically manufacture a part to be used for mechanical coupling of automotive parts manufactured with different materials.
C21D 8/00 - Modifying the physical properties by deformation combined with, or followed by, heat treatment
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
A cold rolled steel sheet according to an exemplary embodiment of the present invention comprises, by wt %: C: 0.01 to 0.10%; Mn: 0.1 to 0.4%; Al: 0.01 to 0.10%; P: 0.003 to 0.020%; N: 0.001 to 0.006%; S: 0.015% or less; Cr: 0.1 to 0.4%; B: 0.0005 to 0.0035%; Ni: 0.04 to 0.10%; and the balance Fe and other unavoidable impurities, and comprises a (Cr—B)(C—N)-based composite precipitate having a size of 0.01 to 0.1 μm, wherein a [I 222+I 554]/I 200 texture ratio is 5.0 to 10.0, an earing rate is less than 3.0%, and an alloying rate of an alloy layer may be 5 to 15%.
An aspect of the present invention provides: an austenitic high-manganese steel having excellent extreme low temperature toughness in a heat-affected cone; and a method for manufacturing same.
A cold-rolled steel sheet, according to one embodiment of the present invention, may comprise in percentage by weight: carbon (C): 0.010-0.025%; manganese (Mn): 0.10-0.25%; sulfur(S): 0.002-0.011%; boron (B): 0.0006-0.0026%; nitrogen (N): 0.0010-0.0034%; aluminum (Al): 0.006-0.028%; and the balance being Fe and unavoidable impurities, and may comprise precipitates of at least one of MnS and BN, wherein the average particle diameter of the precipitates may be 40-250 nm, the area fraction of the precipitates in the cold-rolled steel sheet may be 1-10%, and the yield strength may be 150-220 MPa.
According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected cone, and a manufacturing method therefor can be provided.
Provided are a metal material, for a fuel cell separator, having: five or more fine protrusions of 10 to 100 nm on the metal material surface coming into contact with a GDL in a fuel cell; and a real surface length/protrusion-free apparent surface length ratio of 1.15 or more based on a cross-section observed by a transmission electron microscope. The metal material is characterized by having a contact resistance of 10 mΩ·cm2 or less by forming fine protrusions on the surface.
An aluminum alloy-plated steel sheet having excellent workability and corrosion resistance and a method for manufacturing the same are disclosed. The aluminum alloy-plated steel sheet includes a base sheet, and an alloy-plated layer formed on the base sheet. Interfacial roughness between the alloy-plated layer and the base steel sheet is 25 μm or less. Such an aluminum alloy-plated steel sheet prevents microcracks generated during hot forming and has excellent seizure resistance and corrosion resistance. A method for manufacturing such an aluminum alloy-plated steel is also disclosed.
The present disclosure relates to a graphite steel wire rod for TV PEM nut parts, a graphite steel, and a manufacturing and cutting method therefor, and more particularly, to a cutting method for manufacturing industrial parts, a graphite steel wire rod, a graphite steel wire rod, a graphite steel, and a manufacturing method therefor.
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
The present invention provides a method for manufacturing molded parts, the method being characterized by comprising: a first molding step for molding a base material to form a first molded part including a first upper flange and a pair of first web members extending in intersecting directions from the left and right ends of the first upper flange; and a second molding step for compressing the first molded part to form a second molded part including a second upper flange and a pair of second web members extending in intersecting directions from the left and right ends of the second upper flange, wherein, in a width direction cross section, the first upper flange is longer than the second upper flange and the first web members are longer than the second web members.
A cold-rolled steel sheet having improved strength and elongation, according to one embodiment of the present invention, comprises, in weight %: 0.04-0.08% of C; 0.05% or less (excluding 0%) of Si; 0.1-0.6% of Mn; 0.02-0.06% of Al; 0.015% or less (excluding 0%) of P; 0.015% or less (excluding 0%) of S; 0.006% or less (excluding 0%) of N; 0.02-0.04% of Nb; and the remainder of Fe and other inevitable impurities, wherein the cold-rolled steel sheet has a component reinforcement index defined by expression 1 of 470 or less, a crystal grain aspect ratio defined by expression 2 of 2.15 or less, and a composite reinforcement index defined by expression 3 of 500 to 600.
Provided are a flash butt bonding member and a welding method. The present invention relates to a bonding member having a bonding portion obtained by flash-butt-welding a steel plate and, more particularly, to a bonding member having excellent processability and a welding method, characterized in that the difference in average effective crystal grain diameter between a coarse crystal grain thermally affected portion and a fine crystal grain thermally affected portion formed on one of the left and right sides with reference to a bonding line of the bonding portion is 10μm or less.
The present invention relates to: a hot rolled steel sheet for ground reinforcement and a steel pipe for ground reinforcement, which have excellent strength and formability; and manufacturing methods thereof. An aspect of the present disclosure is to provide a hot-rolled steel sheet for ground reinforcement and a steel pipe for ground reinforcement, having excellent strength and formability, and manufacturing methods thereof.
The present disclosure relates to a cold rolled steel sheet having excellent weldability, strength and formability and a method of manufacturing the same.
The present disclosure relates to a cold rolled steel sheet having excellent weldability, strength and formability and a method of manufacturing the same.
An aspect of the present disclosure is to provide a cold-rolled steel sheet having excellent weldability, strength, and formability, and a method of manufacturing the same.
The present disclosure relates to a cold rolled steel sheet having excellent weldability, strength and formability and a method of manufacturing the same.
An aspect of the present disclosure is to provide a cold-rolled steel sheet having excellent weldability, strength, and formability, and a method of manufacturing the same.
As set forth above, according to an aspect of the present disclosure, a cold-rolled steel sheet having excellent weldability, strength, and formability and a method of manufacturing the same may be provided.
The present invention relates to technology for printing an image such as a letter, a picture, or the like on a surface of a metal material, including printing equipment capable of stably printing the image on the surface of the metal material at high speed, a printing method using the same, and a printed metal material obtained therefrom.
G03G 15/01 - Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
G03G 15/08 - Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
G03G 15/16 - Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern
G03G 15/20 - Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
G03G 21/00 - Arrangements not provided for by groups , e.g. cleaning, elimination of residual charge
G03G 21/06 - Eliminating residual charges from a reusable imaging member
The present invention provides a battery case comprising: a side frame; longitudinal members which are arranged in the side frame and extend in the longitudinal direction; width-direction members which are arranged in the side frame and extend in the width-direction so as to be connected crosswise with the longitudinal members, and which each include a first lower width-direction unit and a second lower width-direction unit that are arranged overlapping in the height direction; and a cooling panel which is arranged above the first lower width-direction units and cools a battery module.
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
This floating wind power generation device comprises: a power generation part for performing wind power generation; and a floating body for supporting the power generation part, wherein the floating body can include: a main column for supporting the power generation part; a plurality of auxiliary columns provided in the vicinity of the main column; a plurality of connection members for connecting the main column and each of the plurality of auxiliary columns; and a plurality of pontoons provided below the plurality of connection members with respect to the direction of gravity so as to support the weight of each of the main column and the plurality of auxiliary columns.
B63B 43/06 - Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability using ballast tanks
F03D 13/25 - Arrangements for mounting or supporting wind motorsMasts or towers for wind motors specially adapted for offshore installation
The present invention relates to a steel plate and a manufacturing method thereof and, more specifically, to an ultra-high strength steel plate having excellent impact resistance in a bend forming part, and to a manufacturing method thereof.
The present invention relates to a graphite steel having excellent machinability, and a manufacturing method therefor, and more specifically, to a calcium-containing graphite steel having machinability superior to that of normal free-cutting steel and a manufacturing method therefor.
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
The present invention provides a seat frame comprising: a cushion part for supporting a cushion; a height-adjusting part which is provided below the cushion part, and which adjusts the height of the cushion part by means of a plurality of rotary links; a rotating part which is provided below the height-adjusting part, and which rotates the height-adjusting part and the cushion part; and reinforcing bracket parts which are coupled to the lower side of the rotating part so as to reinforce the rotating part, and which are provided over a pair of rails of a rail part arranged below same so as to be spaced apart.
B60N 2/16 - Seats specially adapted for vehiclesArrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
B60N 2/02 - Seats specially adapted for vehiclesArrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
B60N 2/14 - Seats specially adapted for vehiclesArrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable rotatable, e.g. to permit easy access
An embodiment of the present invention provides a hot-rolled steel sheet comprising, by wt %, 0.06-0.12% of C, 0.004-0.4% of Si, 0.8-2.0% of Mn, 0.01-0.05% of Al, 0.05-1.0% of Cr, 0.001-0.3% of Mo, 0.001-0.05% of P, 0.001-0.005% of S, 0.001-0.01% of N, 0.001-0.05% of Nb, 0.001-0.05% of Ti, 0.001-0.005% of B, and the remainder of Fe and other inevitable impurities, satisfying relational formula 1 below, and having a microstructure including, by area, 80% or more of auto-tempered martensite, and a remainder of at least one of fresh martensite, bainite, and ferrite. [Relational formula 1] (10[C]+[Si]+2.5[Mn])/(1.5[Cr]+2.0[Mo]−3.2[Nb])≤20
The present invention relates to an ultra-high strength cold-rolled steel sheet and a manufacturing method thereof and, more specifically, to a cold-rolled steel sheet and a manufacturing method thereof, wherein the cold-rolled steel sheet has a tensile strength of 1.5 GPa and exhibits an excellent elongation rate, and as such, can be suitably used for cold stamping.
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
24.
ALUMINUM-BASED PLATED STEEL PLATE FOR HOT PRESS HAVING EXCELLENT RESISTANCE AGAINST HYDROGEN DELAYED FRACTURE AND SPOT WELDABILITY, AND METHOD FOR MANUFACTURING SAME
The present invention provides an aluminum-based plated steel plate used in hot-press forming, the steel plate comprising: a base steel plate; and a plating layer formed on the base steel plate, wherein the plating layer comprises: an alloying layer formed on the surface of the base steel plate and including one or more of Fe3Al, FeAl(Si), Fe2Al5, and FeAl3; and an aluminum layer formed on the alloying layer and having a thickness less than 10% of the thickness of the plating layer, and the plating layer has a thickness of 5-20 μm and an oxygen content of 10 weight % or less, as measured by GDS, at a depth of 0.1 μm from the surface of the plating layer.
The present invention relates to a hot press formed member. A hot press formed member according to one aspect of the present invention comprises a steel sheet; and a plating layer on the steel sheet, wherein a number of voids per 1000 μm2 of an area from an interface between the plating layer and the steel sheet to 15 μm is zero and wherein a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis is 7 wt %/μm or less.
B32B 5/18 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by features of a layer containing foamed or specifically porous material
B32B 5/20 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by features of a layer containing foamed or specifically porous material foamed in situ
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
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
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 38/08 - Ferrous alloys, e.g. steel alloys containing nickel
C22C 38/12 - Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium or niobium
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium
C22C 38/20 - Ferrous alloys, e.g. steel alloys containing chromium with copper
C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium
C22C 38/26 - Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron
C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
C22C 38/40 - Ferrous alloys, e.g. steel alloys containing chromium with nickel
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
C22C 38/48 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
C22F 1/04 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
C23C 2/04 - Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shapeApparatus therefor characterised by the coating material
C23C 2/06 - Zinc or cadmium or alloys based thereon
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
C23C 28/02 - 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 only coatings of metallic material
C23C 30/00 - Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
C23F 17/00 - Multi-step processes for surface treatment of metallic material involving at least one process provided for in class and at least one process covered by subclass or or class
26.
ALLOY FOR BRAZING OF STAINLESS STEEL, AND BRAZED JOINT
The present invention relates to an alloy for brazing of stainless steel, and a brazed joint, and, more specifically, to an alloy for brazing of stainless steel and a brazed joint, that can be preferably applied when pipes made of the same material such as stainless steel or pipes made of different materials such as stainless steel and copper are brazed.
C22C 9/04 - Alloys based on copper with zinc as the next major constituent
B23K 35/30 - Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
B23K 37/053 - Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work aligning cylindrical workClamping devices therefor
The present invention relates to a steel plate and a method for manufacturing same and, more specifically, to a steel plate having excellent strength and toughness after post-welding heat treatment, and a method for manufacturing same.
The present embodiment relates to a valuable metal recovery composition comprising at least one unit valuable metal recovery composition. The unit valuable metal recovery composition comprises: a core part comprising a valuable metal; and a shell part disposed on at least a portion of the core part, wherein the shell part comprises an oxide comprising lithium, and the proportion of the unit valuable metal recovery compositions having an average particle diameter (D50) of greater than 4000 ㎛ in the valuable metal recovery composition is 70% or less of the total valuable metal recovery composition.
The present invention provides a tube structure comprising: a tube body having therein a movement path along which a traveling body moves; and a reinforcing block that is made of a different material from the tube body and coupled to the tube body along the longitudinal direction of the tube body to reinforce the tube body, wherein the reinforcing block has a contact surface in surface contact with the outer surface of the tube body, and the contact surface extends along the longitudinal direction of the reinforcing block.
A recycling method of a cylindrical battery, according to the present invention, comprises the steps of: preparing a cylindrical battery; forming at least one gas outlet in the surface of the cylindrical battery; heating the cylindrical battery having the gas outlet; obtaining a crushed material by crushing the heated cylindrical battery; and obtaining a recovered material by separating the crushed material.
SURFACE TREATMENT COMPOSITION FOR TERNARY HOT DIP GALVANIZED STEEL SHEET, SURFACE-TREATED TERNARY HOT DIP GALVANIZED STEEL SHEET USING SAME AND PREPARATION METHOD THEREOF
The objective of the present invention is to provide a surface treatment composition capable of imparting excellent corrosive resistance, blackening resistance, alkali resistance, and an intrinsic surface color property on a ternary hot dip galvanized steel sheet. The present invention provides a surface treatment composition comprising, with respect to 100% by weight of the solid content of the composition: 70-90% by weight of a resin mixture including a high molecular weight polysilicon-modified polyurethane main resin, a low molecular weight polysilicon-modified polyurethane auxiliary resin, and an auxiliary epoxy resin; 0.5-10% by weight of a tarnish inhibitor; 0.5-10% by weight of an adhesion promoter; 0.5-10% by weight of an anticorrosive agent; 0.1-2% by weight of a coloring pigment; and 0.1-1% by weight of a pigment stabilizer.
C23F 11/18 - Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
The present invention relates to a ferritic stainless steel with excellent clad sheet workability, comprising: by wt %, 0.0005-0.02% of C, 0.005-0.02% of N, 0.01-1.0% of Si, 0.01-1.0% of Mn, 0.001-0.05% of P, 10.0-25.0% of Cr, 0.01-0.5% of Nb, 0.01-0.5% of Ti, and the balance of Fe and inevitable impurities, having an average R-bar value of R values for respective directions is at least 1.5, and having a roughness height after sheet cladding of 25 μm or less. In addition, the present invention relates to a method of manufacturing a ferritic stainless steel. The process involves continuous casting to create a slab with the specified composition, followed by hot rolling at 800-1250° C.; hot annealing same at 900-1050° C., and then cold rolling same with a reduction ratio of 70% or more; and performing final cold annealing at a temperature of 800-950° C. for less than 1 hour.
The present invention pertains to a steel plate and a method for manufacturing same. More specifically, the present invention pertains to a steel plate having high strength and excellent low-temperature impact toughness, and a method for manufacturing same. A steel plate that has excellent strength and low-temperature impact toughness and may be applied as an extremely thick steel material for offshore wind power, and may also be used as a structural steel material for infrastructure industries such as construction and bridges, and a method for manufacturing the same may be provided.
Disclosed in the present specification are: a ferritic stainless steel having improved elongation even if batch annealing is omitted; and a manufacturing method therefor. A ferritic stainless steel according to one embodiment of the present invention may comprise, by wt %, 0.01-0.1% of C, 0.01-1.0% of Si, 0.01-1.5% of Mn, P in an amount greater than 0% and less than or equal to 0.05%, S in an amount greater than 0% and less than or equal to 0.005%, 13.0-18.0% of Cr, 0.005-0.1% of N, 0.005-0.2% of Al, 0.05-0.25% of Ni, and the balance of Fe (iron) and other inevitable impurities.
Provided is a method of manufacturing a Zn—Mg alloy plated steel having excellent plating adhesion and corrosion resistance. The method includes: sequentially forming a first Zn plating layer, a second Mg plating layer, and a third Zn plating layer on base steel by a physical vapor deposition (PVD) method to provide a plated steel material; heating the plated steel material for alloying heat treatment to provide an alloy plated steel material; and cooling the alloy plated steel material. In the providing of the plated steel material, the second Mg plating layer has a thickness of 30% to 35% of the sum of thicknesses of the first Zn plating layer, the second Mg plating layer, and the third Zn plating layer, and the first Zn plating layer has a thickness of 1.1 to 4 times a thickness of the third Zn plating layer.
C23C 14/16 - Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
C23C 14/54 - Controlling or regulating the coating process
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
C23C 28/02 - 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 only coatings of metallic material
C23C 30/00 - Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
The present invention provides a side sill for a vehicle, the side sill comprising: an inner panel; an outer panel which is coupled to the inner panel in the width direction and forms a hollow part together with the inner panel; and a reinforcement frame which is arranged in the hollow part and in which a plurality of unit reinforcement bodies having shapes corresponding to each other are connected in the longitudinal direction.
B62D 29/00 - Superstructures characterised by material thereof
B62D 27/02 - Connections between superstructure sub-units rigid
37.
PLATED STEEL SHEETS FOR HOT PRESS FORMING HAVING EXCELLENT HYDROGEN BRITTLENESS RESISTANCE AND IMPACT RESISTANCE, HOT PRESS FORMED PARTS, AND MANUFACTURING METHODS THEREOF
Provided are plated steel sheets for hot press forming, hot press formed parts, and manufacturing methods thereof, the plated steel sheets comprising: a base steel sheet comprising, in weight %, C: 0.07 to 0.5%, Si: 0.05 to 1%, Mn: 0.5 to 5%, P: 0.001 to 0.015%, S: 0.0001 to 0.02%, Al: 0.01 to 0.18, Cr: 0.01 to 1%, N: 0.001 to 0.02%, Ti: 0.1% or less, B: 0.01% or less, Sn: 0.01 to 0.1%, and a balance of Fe and inevitable impurities; an aluminum or aluminum alloy plating layer disposed on at least one surface of the base steel sheet; and an Sn-enriched layer provided between the base steel sheet and the plating layer, wherein the Sn-enriched layer satisfies a specific relationship.
Provided is an ultrathick steel material for a flange having excellent strength and low temperature impact toughness, and a manufacturing method therefor. The steel material of the present disclosure comprises, in weight %, C: 0.05-0.2%, Si: 0.05-0.5%, Mn: 1.0-2.0%, Al: 0.005-0.1%, P: 0.01% or less, S: 0.015% or less, Nb: 0.005-0.07%, V: 0.001-0.3%, Ti: 0.001-0.05%, Cr: 0.01-0.3%, Mo: 0.01-0.12%, Cu: 0.01-0.6%, Ni: 0.05-4.0%, Ca: 0.0005-0.004%, and the balance being Fe and other unavoidable impurities, wherein the steel material has a microstructure having a prior austenite crystallite grain size of 35 μm or less and including 90 area % or more of at least one of bainite and martensite, and the remainder of ferrite or pearlite.
A steel sheet according to the present invention comprises, in weight%: 0.008-0.015% of C, 0.200% or less of Si; 1.30-2.00% of Mn; 0.5-1.0% of Cr; 0.030% or less of P; 0.010% or less of S; 0.0020-0.0080% of N; and 0.010-0.060% of Al, the remainder being Fe and inevitable impurities, wherein the value of K defined in relational expression 1 is 0 to 15.000, and the microstructure may include, by area%, 0.30-0.80% of a transformed structure, the remainder being ferrite. [Relational expression 1] K = - 651[C] - 2.42[Mn] + 25.7[Cr] - 220[N] (In the formula, [C], [Mn], [Cr] and [N] are the weight% of the respective elements.)
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
C23C 2/06 - Zinc or cadmium or alloys based thereon
40.
PLATED STEEL SHEET HAVING EXCELLENT PLATING ADHESION AND CORROSION RESISTANCE AFTER HOT PRESS FORMING, PREPARATION METHOD FOR PLATED STEEL SHEET, AND HOT PRESSED FORMING MEMBER
The present disclosure relates to a plated steel sheet for hot press forming, having excellent paint adhesion and corrosion resistance after hot press forming; a preparation method for the plated steel sheet; and a hot press formed member. The plated steel sheet according to an aspect of the present disclosure comprises a base steel sheet and a plating layer consisting of Al—Fe alloy formed on the base steel sheet, wherein the sum of contents of Al and Fe in the plating layer is 80% or more by weight, the average content of Fe in the plating layer is 20% or more by weight, and the product of Ra and RPC of the surface of the plating layer may be 60-150 μm/cm. Here, Ra represents arithmetic mean roughness and the unit thereof is μm, and RPc represents the number of peaks per unit length and the unit thereof is /cm.
Disclosed herein are ferritic stainless steel and a manufacturing method wherein the ferritic stainless steel has magnetic properties improved by controlling alloy components and a manufacturing process in order to increase responsiveness to an externally applied magnetic field. The ferritic stainless steel having improved magnetic properties according to an embodiment of the present invention may comprise, by % by weight, C: 0% (exclusive) to 0.02% (inclusive), N: 0% (exclusive) to 0.02% (inclusive), Si: 0.5% to 2.0% (both inclusive), Mn: 0.1% to 0.3% (both inclusive), Cr: 16.0% to 20.1% (both inclusive), Mo: 1.0% (exclusive) to 2.0% (inclusive), Ti: 0.1% to 0.4% (both inclusive), and the balance of iron (Fe) and inevitable impurities.
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
The disclosure relates to a graphite steel wire rod, steel wire, graphite steel and manufacturing methods therefor to which sulfur is added and which have excellent cutting performance to that conventional free-cutting steel. Specifically, the disclosure relates to a graphite steel wire rod and steel wire, and manufacturing methods therefor, the rod and the wire comprising, by wt %, 0.60-0.90% of carbon (C), 2.0-2.5% of silicon (Si), 0.1-0.6% of manganese (Mn), 0.015% or less of phosphorus (P) (excluding 0), 0.031-0.3% of sulfur (S), 0.10-0.05% of aluminum (Al), 0.005-0.02% of titanium (Ti), 0.005-0.0020% of boron (B), 0.0030-0.0150% of nitrogen (N), and the balance of Fe and inevitable impurities. In addition, the present invention relates to graphite steel and a manufacturing method therefor, the steel comprising is same as above, having, as a microstructure, graphite grains distributed in a ferrite matrix, having a degree of graphitization of 90% or more, and containing 5% or less of MnS inclusions and pearlite in total.
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
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 steel suitable as a material for an automotive structural member and particularly, to a high-strength and thick steel sheet having a low yield ratio and high strength, excellent formability and collision resistance due to excellent hole expandability through improved ductility, and a method thereof.
The present invention pertains to a hot-rolled ferritic stainless steel sheet having excellent formability, which has an R-bar value of at least 1.08 and satisfies TS/YS≤1.5 representing the ratio of tensile strength (TS) to yield strength (YS) after a steel, containing 0.001-0.1% of C, 10.0-14.0% of Cr, 0.001-0.5% of Ti, 0.001-0.5% of Nb, 0.001-1.5% of Ni, 0.001-1.5% of Mn, 0.001-1.0% of Cu, 0.001-2.0% of Si, 0.001-0.1% of N, and 0.1% or less of Al, with the remainder comprising Fe and inevitable impurities, is hot-rolled and then pre-rolled at a reduction ratio of 30% or more.
Provided is a method of controlling coating weight coated on a strip by using an air knife disposed in a travelling direction of the strip in a continuous plating process in which the strip is dipped in a molten metal pot and is coated. The method includes: training a neural network with accumulated operation conditions; and deriving an absolute value of at least one of an air knife gap and an air knife pressure by using the trained neural network based on an input operation condition.
POSTECH ACADEMY-INDUSTRY FOUNDATION (Republic of Korea)
Inventor
Lee, Sea-Woong
De Cooman, Bruno C.
Lee, Kyoo-Young
Seo, Eun-Jung
Lee, Seon-Jong
Ryu, Joo-Hyun
Lee, Won-Hwi
Abstract
One aspect of the present invention relates to an ultrahigh-strength steel sheet having an excellent yield ratio, comprising, by wt %, 0.3-0.5% of C, 2.0% (excluding 0%) of Si, 3.0-6.5% of Mn, 0.02% or less of P, 0.01% or less of S, 0.01-3.0% of Al, 0.02% or less (excluding 0%) of N, and the balance of Fe and other inevitable impurities, and a microstructure comprises 5-30% of remaining austenite by area fraction and comprises 5% or less of secondary martensite.
The present invention relates to: a high-strength cold-rolled steel sheet having excellent quality and low mechanical property deviation; and a manufacturing method therefor. More particularly, the present invention relates to: a high-strength cold-rolled steel sheet that can be suitably used for automotive parts by ensuring high strength and elongation with little surface defects and low mechanical property deviation; and a manufacturing method therefor.
An aspect of the present invention may provide a hot-rolled steel sheet having excellent yield strength, vibration damping ratio, weldability, and low-temperature toughness in a weld zone, and thus having physical properties suitable for application to a tube of a hyperloop vacuum train, and a method for manufacturing the same.
The present invention relates to a technology for printing an image of a letter, a drawing, etc. on the surface of a metallic material and, specifically, to printing equipment and a printing method using same, which can stably print an image on the surface of a metallic material at high speed.
G03G 15/00 - Apparatus for electrographic processes using a charge pattern
G03G 15/01 - Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
G03G 15/16 - Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern
G03G 21/00 - Arrangements not provided for by groups , e.g. cleaning, elimination of residual charge
50.
HIGH-STRENGTH COLD-ROLLED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND LOW MATERIAL VARIATION, AND METHOD FOR MANUFACTURING SAME
Provided is a high-strength cold-rolled steel sheet having excellent surface quality and low material variation, and a method for manufacturing same. More specifically, the present invention pertains to: a high-strength cold-rolled steel sheet which has few surface defects and little material deviation, as well as high strength and elongation, and is thus suitable for use in automotive parts; and a method for manufacturing same.
The present invention provides a steel manufacturing method and a casting method using same, the steel manufacturing method comprising the steps of: providing first molten iron; providing first molten steel having a lower carbon (C) content than the first molten iron; mixing the first molten iron and the first molten steel in a ratio ranging from 20.3:79.7 to 98.6:1.4; charging second molten iron prepared by the mixing step into a refining vessel; and refining the second molten iron to prepare second molten steel. Accordingly, high-grade steel can be efficiently manufactured and carbon emissions can be reduced.
The present invention provides a plated steel sheet excellent in corrosion resistance and excellent in at least one of weldability and phosphatability, and a manufacturing method therefor. And more specifically, the present invention provides a Zn—Mg—Al-based plated steel sheet excellent in corrosion resistance, weldability and phosphatability, and a manufacturing method therefor.
Disclosed are a ultrafine austenitic stainless steel simultaneously satisfying a high strength, a high elongation, and a high yield ratio and a method for manufacturing the same. An austenitic stainless steel according to an embodiment of the present disclosure includes, in percent by weight (wt %), 0.005 to 0.03% of carbon (C), 0.1 to 1.0% of silicon (Si), 0.1 to 2.0% of manganese (Mn), 6.0 to 12.0% of nickel (Ni), 16.0 to 20.0% of chromium (Cr), 0.01 to 0.2% of nitrogen (N), 0.25% or less of niobium (Nb), and the balance of iron (Fe) and inevitable impurities, wherein a thickness central region has an average grain size d of 5 μm or less, and a fraction of a unrecrystallized area in a band form is 10% or less.
The present invention relates to a high-strength steel sheet having excellent surface quality due to improved coatability thereof and a method for manufacturing same.
The present invention relates to a zinc plated steel sheet having excellent surface quality and spot weldability, and a manufacturing method therefore. A zinc plated steel sheet according to one aspect of the present invention comprises a base steel sheet and a zinc-based plating layer formed on the surface of the base steel sheet, wherein the GDOES profile of oxygen, which is measured in the depth direction from the surface of the base steel sheet, has a form in which a local minimum point and a local maximum point alternately appear in the depth direction from the surface, and the difference (a local maximum value−a local minimum value) between the oxygen concentration (a local minimum value) at the local minimum point and the oxygen concentration (a local maximum value) at the local maximum point can be 0.1 wt % or more.
RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY (Republic of Korea)
Inventor
Kim, Jin Hong
Bae, Hong-Youl
Cho, Mun Kyu
Choi, Nam Soon
Lee, Sang-Lag
Bae, Weon-Soo
Lee, Yong Won
Moon, Ji-Woong
Abstract
One embodiment of the present invention relates to a lithium metal anode. Wherein the lithium metal anode comprises a current collector and a lithium metal thin film layer disposed on at least one surface of the current collector and having a thickness in a range of 0.1 to 200 μm and a coating layer disposed on a surface of the lithium metal thin film layer, wherein, the coating layer comprising a Li—N—C—H—O based ionic compound.
The present invention relates to steel suitable for a pressure vessel that can be used as petrochemical manufacturing equipment, a storage tank, and the like, and, more specifically, to steel having excellent hydrogen-induced cracking (HIC) resistance and low-temperature impact toughness and a method for manufacturing same.
The present invention provides a Zn—Mg—Al-based plated steel sheet having excellent in corrosion resistance and whiteness, and a method for manufacturing the same. And more specifically, the present invention provides a Zn—Mg—Al-based plated steel sheet having excellent in corrosion resistance, whiteness and bendability, and a method for manufacturing the same.
The present invention provides a Zn—Mg—Al plated steel sheet having excellent in corrosion resistance and bendability, and a method for manufacturing same. And more specifically, the present invention provides a Zn—Mg—Al-based plated steel sheet having excellent in corrosion resistance, bendability, and plating adhesion, and a method for manufacturing the same.
The present invention provides a cross member for a battery case. The cross member comprises: a first frame part; a second frame part; and a connection frame part arranged between the first frame part and the second frame part to connect the first frame part with the second frame part, wherein the connection frame part is made of a material different from those of the frame part and the second frame part.
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 50/262 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders with fastening means, e.g. locks
61.
SHAPE CHECKING DEVICE FOR BENDING MATERIAL AND CONTINUOUS FORMING MACHINE
The present invention provides a shape checking device for a bending material including: a material fixing unit including a support member in which a first surface of a material including a first surface and a second surface, bent from the first surface is seated, and a pressing member configured to press the first surface of the material; and a distance measuring unit, and measuring a distance to the second surface, wherein the distance measuring unit includes a first distance measuring device for measuring a distance to the second surface, and a second distance measuring device for measuring a distance to a second surface, which is the same as the second surface on which a distance thereof is measured by the first distance measuring device, in a position, spaced apart from the first distance measuring device in a first direction, different from a bending forming direction of a material.
B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses
The present invention relates to: a steel material having high strength and excellent impact toughness, the steel material being usable for a land wind power generator and the like; and a method for manufacturing same.
Provided is a cold-rolled steel sheet including: by weight %, C: 0.10 to 0.16%, Si: 0.3 to 0.8%, Al: 0.01 to 0.5%, Mn: 2.0 to 3.0%, Cr: 0.001 to 0.5%, Mo: 0.001 to 0.5%, B: 0.0001 to 0.001%, Nb: 0.001 to 0.05%, Ti: 0.001 to 0.05%, P: 0.04% or less (excluding 0%), S: 0.01% or less (excluding 0%), N: 0.01% or less (excluding 0%), a remainder of Fe, and other unavoidable impurities, as a microstructure, by area %, ferrite: 10% or less (excluding 0%), retained austenite: more than 1% to 5% or less, martensite: 25% or more but less than 50%, and bainite: 35% or more but less than 70%. An average size of martensite-austenite (MA) in the bainite is 0.35 to 0.55 μm.
Provided is a bilayer composition for surface treatment of a steel plate and a surface-treated steel plate using same. The bilayer composition for surface treatment of a steel plate, comprising an undercoat coating composition including 1 to 12 wt % of a phenoxy resin, 0.001 to 1.0 wt % of colloidal silica, 0.001 to 1.0 wt % of a silane coupling agent, 0.1 to 1.0 wt % of a corrosion inhibitor, 0.001 to 1.0 wt % of a phosphoric acid compound as a long-term corrosion resistance improving agent, and a balance of water; and a topcoat coating composition including 0.1 to 5.0 wt % of an acrylic acid resin, 30 to 50 wt % of colloidal silica, 40 to 60 wt % of alkoxy silane, 5 to 15 wt % of an acrylate-based monomer, 0.01 to 1.00 wt % of an acidity control agent, and a balance of an organic solvent.
B05D 7/14 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
B05D 7/00 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
C09D 133/08 - Homopolymers or copolymers of acrylic acid esters
C09D 171/00 - Coating compositions based on polyethers obtained by reactions forming an ether link in the main chainCoating compositions based on derivatives of such polymers
65.
METHOD FOR MANUFACTURING HIGH-CHROMIUM (CR) MOLTEN STEEL, METHOD FOR MANUFACTURING CAST PIECE, AND METHOD FOR MANUFACTURING PRESS ROLL
An embodiment of the present invention relates to a method for manufacturing high-chromium (Cr) molten steel having a chromium (Cr) content of 4.5 wt% to 5.5 wt%, and the method may comprise the operations of: inserting molten steel into a steel converter used in the process of manufacturing stainless steel; and inputting chromium (Cr)-containing chromium steel alloy into the steel converter such that the content of chromium (Cr) in the molten steel reaches 4.5 wt% to 5.5 wt%. Therefore, according to the embodiments of the present invention, high-chromium (Cr) molten steel can be manufactured by using a steel converter that is used in the steelmaking process of other steel types, without contaminating same. In addition, when raising the temperature of high-chromium (Cr) molten steel or performing degassing to discharge gas, the present invention enables efficiently increasing the temperature of the molten steel and improves degassing efficiency.
The present invention pertains to: a hot-rolled steel plate; a steel tube; and methods for manufacturing the steel plate and steel tube. More specifically, the present invention pertains to: a high manganese hot-rolled steel plate having excellent abrasion resistance; a steel tube manufactured using the hot-rolled steel plate; and methods for manufacturing the steel plate and steel tube.
Disclosed in the present specification are steel and a steel wire, which are for a spring, and manufacturing methods therefor, the steel and the steel wire having excellent resistance to permanent deformation by having increased in-material dislocation density or reduced average grain diameter. The steel wire for a spring, having excellent resistance to permanent deformation, according to one embodiment of the present invention, comprises, by wt %, 0.4-0.7% of C, 1.2-2.3% of Si, 0.2-0.8% of Mn, 0.2-0.8% of Cr, and the balance of Fe (iron) and other inevitable impurities, wherein the dislocation density thereof can be 1.16×1015/m2 or more, and the average grain diameter thereof can be 8.4 μm or less.
C22C 38/34 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
B21C 1/02 - Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
C21D 1/18 - HardeningQuenching with or without subsequent tempering
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
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
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium
C22C 38/26 - Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
68.
ADVANCED HIGH STRENGTH ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND ELECTRICAL RESISTANCE SPOT WELDABILITY AND MANUFACTURING METHOD THEREOF
The present disclosure relates to a high-strength hot-dip galvanized steel sheet having excellent surface quality and electrical resistance spot weldability, and a method for manufacturing the same. A galvanized steel sheet according to an aspect of the present disclosure is a galvanized steel sheet including a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet, wherein a ratio (a/b) of a hardness of a surface layer portion (a) to a hardness of an internal portion (b) of the base steel sheet may be less than 0.95.
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
C21D 1/19 - HardeningQuenching with or without subsequent tempering by interrupted quenching
C21D 1/25 - Hardening, combined with annealing between 300 °C and 600 °C, i.e. heat refining ("Vergüten")
C21D 1/76 - Adjusting the composition of the atmosphere
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
C23C 28/02 - 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 only coatings of metallic material
C23C 30/00 - Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
69.
PLATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE, GALLING RESISTANCE, WORKABILITY AND SURFACE PROPERTY AND METHOD FOR MANUFACTURING SAME
STEEL & CONVERGENCE TECHNOLOGY RESEARCH ASSOCIATION (Republic of Korea)
POSCO COATED & COLOR STEEL CO., LTD. (Republic of Korea)
Inventor
Kim, Sung-Joo
Park, Kyung-Kwan
Hong, Moon-Hi
Kim, Heung-Yun
Park, Tae-Yeul
Kim, Myung-Soo
Sohn, Il-Ryoung
Kim, Tae-Chul
Kang, Dae-Young
Abstract
Provided are a plated steel sheet and a method for manufacturing same, the plated steel sheet comprising: a base steel sheet; a Zn—Mg—Al plating layer provided on at least one surface of the base steel sheet; and an Fe—Al inhibition layer provided between the base steel sheet and the Zn—Mg—Al plating layer. The plating layer comprises, by weight %, 4 to 10% of Mg and 5.1-25% of Al and the remainder being Zn and unavoidable impurities with respect to components not including iron (Fe) diffused from the base steel sheet. The plating layer comprises a 24-50% MgZn2 phase in phase fraction. In the MgZn2 phase, an Al single phase is present in the ratio of 1-30% relative to the cross-sectional area of the total MgZn2 phase.
C23C 2/06 - Zinc or cadmium or alloys based thereon
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
C21D 7/06 - Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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
C23C 28/02 - 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 only coatings of metallic material
C23C 30/00 - Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
70.
STEEL PLATE HAVING EXCELLENT HEAT AFFECTED ZONE TOUGHNESS AND METHOD FOR MANUFACTURING SAME
The present invention relates to a steel plate for use in ships and the like, which has excellent toughness in a heat-affected zone (HAZ), even when a steel material having high strength and high ductility is welded with a certain amount of heat input or more, and to a method for manufacturing same.
Disclosed is an austenitic stainless steel including, in percent by weight (wt %), 0.005 to 0.03% of C, 0.1 to 1% of Si, 0.1 to 2% of Mn, 0.01 to 0.4 of Cu, 0.01 to 0.2 of Mo, 6 to 9% of Ni, 16 to 19% of Cr, 0.01 to 0.2% of N, and the balance of Fe and inevitable impurities, wherein an austenitic stability parameter (ASP) value calculated by 551−462 (C+N)−9.2Si−8.1Mn−13.7Cr−29 (Ni+Cu)−18.5Mo is from 30 to 60, a [100*N]/[Ni+Cu] value is 1.4 or more, an average grain size is less than 5 μm, and a fraction (%) of grains with a grain size of 5 μm or more is less than 10%.
A method of manufacturing a low-density clad steel sheet, including: preparing a base material, a lightweight steel sheet including C: 0.3 to 1.0%, Mn: 4.0 to 16.0%, Al: 4.5 to 9.0%, and Fe; preparing cladding materials, each being martensitic carbon steel including C: 0.1 to 0.45%, Mn: 0.1 to 3.0%, and Fe; disposing the base material between the cladding materials to obtain a laminate; welding an edge of the laminate, and heating the welded laminate to 1050 to 1350° C.; finish-rolling the heated laminate to 750 to 1050° C. with a rolling reduction ratio of 30% or more in a first pass, to obtain a hot-rolled steel sheet; coiling the hot-rolled steel sheet at 400 to 700° C.; applying a cold-reduction ratio of 35 to 90% to obtain a cold-rolled steel sheet; and annealing the cold-rolled steel sheet at 550° C. or higher and A3+200° C. or lower of the cladding materials.
B32B 38/00 - Ancillary operations in connection with laminating processes
B23K 20/04 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a rolling mill
B23K 20/227 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded with ferrous layer
B23K 31/02 - Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups relating to soldering or welding
B23K 101/16 - Bands or sheets of indefinite length
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
C21D 1/18 - HardeningQuenching with or without subsequent tempering
C21D 1/25 - Hardening, combined with annealing between 300 °C and 600 °C, i.e. heat refining ("Vergüten")
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C21D 8/04 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
C21D 9/48 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals deep-drawing sheets
C23C 2/18 - Removing excess of molten coatings from elongated material
C23C 2/34 - Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shapeApparatus therefor characterised by the shape of the material to be treated
C23C 30/00 - Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
A side sill for a vehicle according to one embodiment of the present disclosure comprises: a side sill frame formed to have a hollow portion; a first reinforcing frame disposed in the hollow portion and attached to the side sill; a second reinforcing frame disposed in the hollow portion and attached to the first reinforcing frame and the side sill frame, wherein the first reinforcing frame and the second reinforcing frame are disposed in the hollow portion so as to form a closed cross-section in the hollow portion from a thickness-wise cross-section of the side sill frame.
B62D 21/15 - Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
Disclosed is an austenitic stainless steel with improved corrosion resistance and machinability. The austenitic stainless steel with improved corrosion resistance and machinability may comprise, in percent by weight (wt %), 0.05% or less of C (excluding 0), 2% or less of Si (excluding 0), 2% or less of Mn (excluding 0), 0.01% or less of S, 16 to 22% of Cr, 9 to 15% of Ni, 3% or less of Mo (excluding 0), 0.15 to 0.25% of N, 0.004 to 0.06% of B, and the remainder being Fe and inevitable impurities.
A non-oriented electrical steel sheet, according to one embodiment of the present invention includes, by weight %, Si: 3.0 to 4.0%, Al: 0.3 to 1.5%, Mn: 0.1 to 0.6%, at least one from among Sn and Sb: 0.006 to 0.1%, C: 0.0015 to 0.0040%, Cr. 0.01 to 0.03%, Cu: 0.003 to 0.008%, Mg: 0.0005 to 0.0025%, and a balance of Fe and inevitable impurities.
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 relates to a self-bonding electrical steel sheet and a laminate comprising same, the self-bonding electrical steel sheet comprising an electrical steel sheet and a self-bonding layer positioned on the electrical steel sheet, wherein the amount of inorganic material in the self-bonding layer is 5-35 wt % and the tensile/shear strength of the laminate is 7.5-20 N/mm2.
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
B32B 37/12 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
77.
PLATED STEEL SHEET FOR HOT PRESS FORMING HAVING EXCELLENT HYDROGEN EMBRITTLEMENT RESISTANCE, HOT PRESS FORMED PARTS, AND MANUFACTURING METHODS THEREOF
The present disclosure relates to: a plated steel sheet which is for hot forming, has excellent hydrogen embrittlement resistance, and includes an Al-based plating layer formed on the surface of a base steel sheet, wherein the average Ni content in the Al-based plating layer is 0.05 to 0.35 wt %; and a method for manufacturing same.
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 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron
C23C 28/02 - 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 only coatings of metallic material
78.
STAINLESS STEEL HAVING EXCELLENT CONTACT RESISTANCE OR PEMFC SEPARATOR AN METHOD OF MANUFACTURING SAME
Disclosed are a stainless steel for a fuel cell separator and a method of manufacturing the same. The stainless steel has a low contact resistance as a material for a fuel cell separator and surface roughness parameters that may represent a surface shape of the stainless steel are defined and provided. Specifically, the present disclosure provides a stainless steel for a fuel cell separator with excellent contact resistance and a method of manufacturing the same. The stainless steel includes, in percent by weight (wt %), more than 0 but not more than 0.02% of C, more than 0 but not more than 0.02% of N, more than 0 but not more than 0.4% of Si, more than 0 but not more than 0.3% of Mn, more than 0 but not more than 0.04% of P, more than 0 but not more than 0.02% of S, 15 to 34% of Cr, more than 0 but not more than 1% of Cu, more than 0 but not more than 0.4% of Ni, more than 0 or not more than 0.5% of at least one of Ti and Nb, and the balance of Fe and inevitable impurities, wherein at least one surface has a three-dimensional arithmetic average roughness (Sa) of 0.05 μm or more and a developed interfacial area ratio (Sdr) of 5% or more.
A melt transportation apparatus according to an embodiment of the present invention comprises: a container having an internal space in which melt can be accommodated and an opening through which the melt can be input/output; a cover part which has a cover member capable of closing the opening and which is positioned at the top of the container so as to be movable forward/backward with respect to the opening; and a support part having a rotary body, which can move forward/backward with respect to the cover part at the bottom of the cover part so that the support part can be in contact with the cover part. Therefore, according to embodiments of the present invention, the opening of the container can be easily opened/closed in a limited space. In addition, when the opening is opened/closed by moving the cover part, sagging or tilting of the cover part can be prevented. Thus, the cover part can be easily moved and exposure of at least a portion of the opening to the outside can be prevented. Therefore, a decrease in the temperature of the melt inside the container can be prevented or suppressed.
B22D 41/26 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rotatively movable plate
B22D 41/12 - Travelling ladles or similar containersCars for ladles
80.
PLATED STEEL SHEET FOR HOT PRESS FORMING HAVING EXCELLENT IMPACT PROPERTY, HOT PRESS FORMED PART, AND MANUFACTURING METHOD THEREOF
One implementation of the present disclosure relates to a bonding composition for an electrical steel sheet, comprising an adhesive resin and a bonding additive, wherein the adhesive resin is polyurethane formed by reacting a polyol and a monomer represented by a specific chemical formula.
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
The present invention relates to an electrical steel sheet and a laminate thereof, and provided is an electrical steel sheet including: an electrical steel sheet, and a polyurethane coating layer positioned on the electrical steel shoot, in which the rebound clastic modulus of the polyurethane coating layer is 5% to 30%.
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
H01F 1/147 - Alloys characterised by their composition
83.
COLD-ROLLED STEEL PLATE FOR HOT FORMING, HAVING EXCELLENT CORROSION-RESISTANCE AND SPOT-WELDABILITY, HOT-FORMED MEMBER, AND METHOD FOR MANUFACTURING SAME
An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤ 0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).
Provided are a flash butt welding member with a welding part that is highly formable, and a welding method. The present invention relates to a welding member having excellent formability, and a production method. The welding member has a welding part that results from flash butt welding butt joints of a steel sheet using an electrode, and the average hardness difference is 50 or less in Vickers hardness between the coarse-grained and fine-grained heat-affected areas formed on any one side, left or right, of the welding line (welding interface) of the welding part.
The present invention pertains to a hot press forming member having excellent resistance to hydrogen embrittlement, and a method for manufacturing same. An aspect of the present invention provides a hot press forming member having excellent resistance to hydrogen embrittlement, the hot press forming member comprising a base steel plate and an alloy-plated layer formed on the surface of the base steel plate, wherein the alloy-plated layer contains pores such that pores having a size of 5 μm or less constitute 3-30% of the surface area of the alloy-plated layer as viewed in a cross-section taken in the thickness direction of the member.
C21D 8/04 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
The present disclosure relates to a zinc plated steel sheet having excellent fatigue strength of electrical resistance spot welds and a method for manufacturing the same. According to an aspect of the present disclosure, a zinc plated steel sheet includes a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet, wherein a concentration profile of one or two of oxygen, and silicon and manganese measured in a depth direction from the surface of the base steel sheet has a maximum point in the depth direction from the surface, and an absolute value of a difference between a depth at which the maximum point of the concentration profile of oxygen is formed and a depth at which the maximum point of the concentration profile of one of silicon and manganese is formed is 0.5 μm or less.
A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention contains, by wt %, 0.005% or less (excluding 0%) of C, 1.2 to 2.7% of Si, 0.4 to 2.0% of Mn, 0.005% or less (excluding 0%) of S, 0.3% or less (excluding 0%) of Al, 0.005% or less (excluding 0%) of N, 0.005% or less (excluding 0%) of Ti, and a balance of Fe and inevitable impurities, wherein the non-oriented electrical steel sheet satisfies the following Expression 1, and a volume fraction of grains having an angle of 15° or less between a {112} plane and a rolling plane in the steel sheet is 40 to 60%.
A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention contains, by wt %, 0.005% or less (excluding 0%) of C, 1.2 to 2.7% of Si, 0.4 to 2.0% of Mn, 0.005% or less (excluding 0%) of S, 0.3% or less (excluding 0%) of Al, 0.005% or less (excluding 0%) of N, 0.005% or less (excluding 0%) of Ti, and a balance of Fe and inevitable impurities, wherein the non-oriented electrical steel sheet satisfies the following Expression 1, and a volume fraction of grains having an angle of 15° or less between a {112} plane and a rolling plane in the steel sheet is 40 to 60%.
0.3
≤
(
[
Si
]
+
[
Al
]
-
1
.
5
)
/
[
Mn
]
≤
0
.
8
5
[
Expression
1
]
(In Expression 1, [Si], [Al], and [Mn] represent contents (wt %) of Si, Al, and Mn, 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
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
A side sill for a vehicle according to the present invention may comprises: a side sill frame formed to have a cavity portion; a partition member that passes through the cavity portion and partitions the cavity portion into a first cavity and a second cavity; a first reinforcing frame which is positioned in the first cavity and contacts the side sill frame and the partition member to form a closed section in the first cavity on a thickness-direction cross-section of the side sill frame; and a second reinforcing frame which is positioned in the second cavity and contacts the side sill frame and the partition member to form a closed section in the second cavity on a thickness-direction cross-section of the side sill frame.
B62D 21/15 - Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
B62D 27/02 - Connections between superstructure sub-units rigid
A gas detection device is disclosed. A gas detection device according to an embodiment of the present invention includes a case in which a plurality of grooves are formed in a circumferential surface, an inlet which is coupled to a first groove among the grooves and through which air is introduced into the case, a power button which is coupled to a second groove among the grooves and turns a power source on or off, a gas detector which is provided in the case and detects a gas contained in the introduced air, a light unit which is coupled to a third groove among the grooves and informs a state in which the power source is turned on or off and whether the gas is detected, a battery which supplies power, a beep generator which generates a beep when a gas detection signal is received from the gas detector, and a power switch operated by the power button to turn on or off so as to supply the power from the battery, wherein one or more of the inlet, the power button, and the light unit are coupled to the grooves in a recessed form, the battery, the beep generator, and the power switch are provided inside the case, and the case is formed in a small spherical shape which is carried in a palm of an operator and moved by the operator.
G01N 1/22 - Devices for withdrawing samples in the gaseous state
G08B 5/22 - Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmissionVisible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electromagnetic transmission
G08B 7/06 - Signalling systems according to more than one of groups Personal calling systems according to more than one of groups using electric transmission
90.
BLACK COLOR PLATED STEEL SHEET, AND MANUFACTURING METHOD THEREOF
RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY (Republic of Korea)
Inventor
Kim, Hye Jeong
Lee, Kyung Hwang
Lee, Taek Geun
Abstract
The present disclosure is that plating steel with spangles can be subjected to constant humidity heat treatment. Due to this, the degree of blackening is different depending on the spangle pattern, and then a black plated steel sheet having a marble texture and a beautiful pattern can be obtained when the blackening is completed.
Disclosed are an ultra-thick steel sheet may have excellent strength and impact toughness, and a manufacturing method thereof. The ultra-thick steel sheet comprises, in percent by weight (wt %), 0.06 to 0.1% of C, 0.3 to 0.5% of Si, 1.35 to 1.65% of Mn, 0.015 to 0.04% of AI, 0.015 to 0.04% of Nb, 0.15 to 0.4% of Cr, 0.005 to 0.02% of Ti, 0.3 to 0.5% of Ni, 0.002 to 0.008% of N, 0.01% or less of P, 0.003% or less of S, and the remainder being Fe and inevitable impurities, and a microstructure, by area fraction, comprises 80% or more of polygonal ferrite with an average grain size of 40 μm or less and the remainder of pearlite with an average grain size of 20 μm or less.
Provided is a welding member having a welding portion that has excellent fatigue properties. The present invention can provide, in the automotive industry, a gas shield arc welding member that can ensure excellent fatigue properties.
Provided is a welded member having a weld that has excellent electrodeposition coating and corrosion resistance properties. The present invention can provide, in the automotive industry, a welded member having a gas-shielded arc-welded portion which can ensure excellent electrodeposition coating and corrosion resistance properties.
B23K 35/30 - Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
B23K 35/36 - Selection of non-metallic compositions, e.g. coatings, fluxesSelection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
B23K 9/16 - Arc welding or cutting making use of shielding gas
B23K 101/00 - Articles made by soldering, welding or cutting
94.
ADHESIVE COATING COMPOSITION FOR ELECTRICAL STEEL SHEET, ELECTRICAL STEEL SHEET LAMINATE, AND MANUFACTURING METHOD THEREFOR
The present disclosure relates to a bonding composition for an electrical steel sheet, and a steel sheet and a laminate to which same is applied, the bonding composition comprising polyurethane formed by reacting a diisocyanate monomer and a polyol, wherein the diisocyanate monomer can comprise an aromatic diisocyanate monomer and an aliphatic diisocyanate monomer.
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
The present invention provides a side sill for vehicles, comprising: a side sill frame having a hollow portion; and a reinforcement frame disposed in the hollow portion and arranged in the longitudinal direction of the side sill frame, wherein: the reinforcement frame includes unit sections which are successive in the longitudinal direction of the side sill frame and have changing heights; and the upper and lower surfaces of the reinforcement frame are spaced apart from the side sill frame.
Provided is a steel suitable as a material for automobiles and, specifically, to a high-strength steel sheet having excellent hole expandability and ductility, and a manufacturing method therefor. The high-strength steel sheet of the present invention has a microstructure comprising a hard phase and a soft phase, wherein a martensite phase, which is the hard phase, is evenly distributed in a recrystallized ferrite matrix through optimized cold-rolling and annealing processes, and a nonequilibrium (quasi-equilibrium) ferrite phase is introduced at the interface between the hard phase and the soft phase so as to increase the crack resistance during processing.
The present invention relates to: an electrical steel sheet including: an electrical steel sheet; and a bonding coating layer positioned on the electrical steel sheet, and further including: a first interface layer positioned in the electrical steel sheet and brought into contact with the bonding coating layer; and a second interface layer positioned in the bonding coating layer and brought into contact with the first interface layer, in which 70 mol % or more of total Si content in the bonding coating layer including the second interface layer is present in the second interface layer.
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
C09J 1/00 - Adhesives based on inorganic constituents
RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY (Republic of Korea)
POSTECH Research and Business Development Foundation (Republic of Korea)
Inventor
Oh, Tae Hyun
Ha, Hyunwoo
Park, Sang Hyeok
Lee, Laekyoung
Seo, Jun Young
Abstract
A method of analyzing a motion on the basis of feature tracking is disclosed. The method includes the steps of: capturing image frames; filtering a region of interest (ROI) for the captured image frames; tracking a feature in the captured image frames; removing an extreme value on the basis of an optimum model; and outputting an analysis result.
A method of analyzing a motion on the basis of feature tracking is disclosed. The method includes the steps of: capturing image frames; filtering a region of interest (ROI) for the captured image frames; tracking a feature in the captured image frames; removing an extreme value on the basis of an optimum model; and outputting an analysis result.
Further disclosed is a system of analyzing a motion on the basis of feature tracking, the system comprising a controller configured to perform each step of the method.
G06V 10/25 - Determination of region of interest [ROI] or a volume of interest [VOI]
G06V 10/44 - Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersectionsConnectivity analysis, e.g. of connected components
99.
IRON CORE OF TRANSFORMER, AND MANUFACTURING METHOD THEREFOR
The present invention relates to an iron core of a transformer having low no-load noise and a manufacturing method therefor, and the iron core of a transformer comprises: a pair of yokes, which are formed by stacking a plurality of electrical steel sheets and the pair of yokes are parallel to each other; and a leg, which is formed by stacking a plurality of electrical steel sheets, and the leg connects the pair of yokes, wherein, in a coupling part in which the yokes and the leg are connected, the ends of the electrical steel sheets of the yokes and the ends of the electrical steel sheets of the leg have inclined surfaces corresponding to each other, the inclined surfaces are shape-fitted, one electrical steel sheet of the yokes is stacked, through step lapping, on another electrical steel sheet of the yokes, and one electrical steel sheet of the leg can be stacked, through step lapping, on another electrical steel sheet of the leg.
H01F 27/245 - Magnetic cores made from sheets, e.g. grain-oriented
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
100.
AUSTENITIC STAINLESS STEEL AND MANUFACTURING METHOD THEREOF
Disclosed are aa austenitic stainless steel free of surface cracks and having excellent surface roughness in a bent portion and a manufacturing method thereof. The austenitic stainless steel according to an embodiment of the present disclosure includes, in percent by weight (wt %), 0.005 to 0.03% of C, 0.1 to 1% of Si, 0.1 to 2% of Mn, 6 to 12% of Ni, 16 to 20% of Cr, 0.01 to 0.2% of N, 0.25% or less of Nb, and the balance of Fe and inevitable impurities, wherein an average grain size (d) of a central portion in a thickness direction is 5 μm or less, and a martensite area fraction measured in the bent portion after a 180° bending test is 10% or less.
