A hot pressed member that has excellent corrosion resistance after coating, in particular when a zirconium chemical conversion treatment is applied, and with reduced microcracks. The hot pressed member includes a steel sheet, a coated or plated layer containing FeAl, Fe2Al5, and Zn distributed over at least one side of the steel sheet, and a Zn-containing oxide layer distributed over the coated or plated layer. The solute Zn content in the FeAl is less than 10 mass %.
The purpose of the present invention is to provide: an electric resistance welded steel pipe having excellent welded section quality; and a method for manufacturing the same. Provided is an electric resistance welded steel pipe having a base material and an electric resistance welded section, wherein: the base material has a component composition including, in terms of mass%, 0.10-0.50% of C, 0.15-0.35% of Si, 0.60-0.90% of Mn, 0.001-0.1% of Al, 0.03% or less of P, 0.03% or less of S, 0.90-1.20% of Cr, 0.15-0.30% of Mo, and 0.25% or less of Ni, with the balance consisting of Fe and unavoidable impurities; in the component composition, Mn/(Si + Cr) is 0.52-0.85; and formula (1) is satisfied in a flattening test of the electric resistance welded steel pipe. Formula (1): h/D ≤ 0.5, where h is the flat crack height (mm) at which a first crack is found in the electric resistance welded section, and D is the outer diameter (mm) of the steel pipe.
A quenching apparatus that is configured to cool a metal sheet, the quenching apparatus including: a cooling device that is configured to perform quenching by cooling the metal sheet with a cooling fluid; a plurality of shape correction rolls that includes at least a front shape correction roll and a back shape correction roll that are configured to be respectively provided at a front surface and a back surface of the metal sheet and press, in a thickness direction of the metal sheet, the metal sheet before being quenched; and a pressing processor that is configured to set, based on a shape of the metal sheet before quenching, a pressing quantity of each shape correction roll of the plurality of shape correction rolls.
A quenching apparatus that is configured to cool a metal sheet, the quenching apparatus including: a cooling device that includes a plurality of jet nozzles that is configured to spray a cooling fluid onto a front surface and a back surface of the metal sheet; and a flow rate adjustment processor that that is configured to set a flow rate of the cooling fluid that is sprayed from the plurality of jet nozzles onto the front surface and the back surface of the metal sheet based on a shape of the metal sheet before quenching.
A designing method of a press forming die reduces a press forming load and includes: making a die model in which a surface of the press forming die is provided with a virtual thickness by a nonrigid two-dimensional element; setting stiffness distributions of the die model by making a boundary condition of the two-dimensional element vary depending on a portion of the die model; acquiring a press forming load by performing a press forming analysis by using the die model in which the stiffness distributions are set; determining whether the press forming load is within a predetermined range of the press forming load; determining the set stiffness distributions of the die model as design stiffness distributions of the press forming die in a case where it is determined that the press forming load is within the predetermined range of the press forming load.
Provided are: a transport roll regeneration method with which an adhering substance on the outer peripheral surface of a transport roll can be efficiently removed; a steel plate manufacturing method; and a transport roll regeneration device. The transport roll regeneration method is for regenerating a transport roll provided in an annealing furnace in order to transport a steel plate, wherein the outer peripheral surface of the transport roll is formed from ceramic, and an adhering substance on the outer peripheral surface of the transport roll is removed by bringing an alkali aqueous solution into contact with the outer peripheral surface of the transport roll.
SCALE REMOVAL FACILITY FOR STEEL SHEET, PRODUCTION FACILITY FOR STEEL SHEET, METHOD FOR REMOVING SCALES FROM STEEL SHEET, AND METHOD FOR PRODUCING STEEL SHEET
A scale removal facility according to the present invention removes scales from a steel sheet that is being conveyed. The scale removal facility includes, in the order from the upstream side in the conveyance direction of the steel sheet, a first acid pickling device that performs first acid pickling on the steel sheet using a first acid solution, a destruction device that mechanically destroys the scales, and a second acid pickling device that performs second acid pickling on the steel sheet using a second acid solution.
B21B 45/06 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling of strip material
C23G 1/04 - Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
8.
METHOD FOR MANUFACTURING PRESS-FORMED PRODUCT, PRESS-FORMED PRODUCT, AND PRESS FORMING METHOD
Provided is a technology for improving productivity while suppressing defects when forming a high-strength steel sheet. A method for manufacturing a press-formed product according to the present invention is a method for press-forming a blank material to manufacture a press-formed product including a top plate portion having an outer peripheral edge portion including a curved portion, a vertical wall portion continuous with the outer peripheral edge portion of the top plate portion, and a flange portion continuous with the vertical wall portion, characterized in that a step for forming a curved vertical wall portion of the vertical wall portion that is continuous with the curved portion includes: a pre-forming step for generating a curved vertical wall portion having a stepped shape in which a lower vertical wall portion, from a stepped portion provided at a prescribed position in a height direction of the curved vertical wall portion to the flange portion, protrudes to the flange portion side relative to an upper vertical wall portion from the stepped portion to the top plate portion; and a main forming step for using a die having a cam structure to flatten the curved vertical wall portion having a stepped shape to the curved vertical wall portion having a flat shape.
The present invention provides: a welded joint for a floating offshore wind turbine composed of a tower member, a floating body member, and a bracket, wherein the welded joint improves the fatigue strength of a welded part by extending a weld bead on the floating body member; and a method for manufacturing the same. A welded joint according to the present invention has a first weld bead, a second weld bead, and a third weld bead. The first weld bead is formed along one short side of a rectangular contact surface through which the bracket contacts the floating body member. The second weld bead and the third weld bead are formed along both long sides of the rectangular contact surface, and are formed covering a starting end section or a terminal end section of the first weld bead and extended on the floating body member. In addition, M/N, which represents the ratio of the distance M between the leading end of the second weld bead and the leading end of the third weld bead to the length N of an extended part of the second weld bead or the third weld bead, is preferably 2.0 or less.
B23K 31/00 - Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups
The present invention provides a high-strength hot-dip galvanized steel sheet that has excellent plating appearance, plating adhesion during intense processing, and LME cracking resistance. Provided is a method for producing a high-strength hot-dip galvanized steel sheet having, at a plating adhesion amount of 20-120 g/m222 and 0.5-10.0 vol ppm HCl.
C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium 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
C23C 2/02 - Pretreatment of the material to be coated, e.g. for coating on selected surface areas
C23C 2/06 - Zinc or cadmium or alloys based thereon
11.
SURFACE TREATMENT LIQUID FOR GALVANIZED STEEL SHEETS, METHOD FOR PRODUCING GALVANIZED STEEL SHEET WITH SURFACE TREATMENT COATING FILM, AND GALVANIZED STEEL SHEET WITH SURFACE TREATMENT COATING FILM
The present invention provides a surface treatment liquid for galvanized steel sheets, which has excellent storage stability and is capable of producing a galvanized steel sheet with a surface treatment coating film excellent in terms of long-term perspiration resistance, flat plate part corrosion resistance, and the like. A surface treatment liquid for galvanized steel sheets according to the present invention is characterized by including a first surface treatment liquid (X) and a second surface treatment liquid (Y), and is also characterized in that: the first surface treatment liquid (X) contains a silane coupling agent (A) which has a glycidyl group, a tetraalkoxysilane (B), a zirconium carbonate compound (C), sodium silicate (D1), a vanadium compound (E), a molybdic acid compound (F), and water, and the contents of the components satisfy a specific relationship; and the second surface treatment liquid (Y) contains sodium silicate (D2), an anionic polyurethane resin (G), and water, and the contents of the components satisfy a specific relationship.
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
C09D 1/00 - Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
C09D 1/02 - Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
C09D 5/00 - Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects producedFilling pastes
C09D 183/06 - Polysiloxanes containing silicon bound to oxygen-containing groups
C23C 22/60 - 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 alkaline aqueous solutions with pH > 8
Provided is a management method for managing information about a plurality of piles of granular materials or powdered materials, the method comprising: a map generation step (S1, S2) for generating a three-dimensional map representing the positions and shapes of a plurality of piles; an association step (S3 to S7) for associating the positions of the plurality of piles in the three-dimensional map with information about the plurality of piles; and an output step (S8, S9) for, when a display terminal is pointed at a target pile of the plurality of piles, outputting information about the target pile in order to display the information together with an image of the target pile on the display terminal.
Provided is a method of manufacturing a grain-oriented electrical steel sheet with a well-formed base film and excellent magnetic properties. After subjecting a steel sheet to cold rolling and decarburization annealing, an annealing separator containing Ti oxide in a predetermined ratio to MgO is applied to the steel sheet surface and dried, and then the steel sheet is held as a coil in a final annealing furnace and subjected to final annealing, where in a heating process of the final annealing, the atmosphere is set to H2: 100 vol % when the maximum temperature of the coil reaches 1100° C., and within 15 hours after the maximum temperature of the coil reaches 1100° C., and after a temperature difference between the maximum temperature and the minimum temperature of the coil becomes 75° C. or less, the atmosphere is changed to a H2 atmosphere containing 5 vol % or more of N2.
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
14.
CARBON-COATED NON-GRAPHITIZABLE CARBON, LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE, AND LITHIUM ION SECONDARY BATTERY
Carbon-coated non-graphitizable carbon used for a negative electrode for a lithium-ion secondary battery, a negative electrode for a lithium-ion secondary battery using the carbon-coated non-graphitizable carbon, and a lithium-ion secondary battery including the negative electrode for a lithium-ion secondary battery are disclosed. The carbon-coated non-graphitizable carbon is carbon-coated non-graphitizable carbon comprising: non-graphitizable carbon; and a carbon coating layer provided on a surface of the non-graphitizable carbon, wherein an average thickness of the carbon coating layer is 4 nm or more and 30 nm or less, and a minimum value of a thickness of the carbon coating layer is 70% or more of a maximum value of the carbon coating layer.
A crane, a transportation method, and a plate member manufacturing method are disclosed. There is provided a crane for performing handling and transportation of a plate member, and the crane includes: a holding mechanism configured to lift and hold the plate member; a drive mechanism configured to move the holding mechanism at least horizontally; an image acquisition mechanism configured to acquire an image of the plate member such that the image includes a feature portion of the plate member; and a control mechanism configured to detect the feature portion from the image, calculate a position of the plate member from a position of the feature portion, and adjust a horizontal position of the holding mechanism based on the position of the plate member.
Provided are a steel sheet; a related member; and methods for manufacturing the same. The steel sheet has a chemical composition including, in mass %, C: 0.06 to 0.25%, Si: 0.4 to 2.5%, Mn: 1.5 to 3.5%, P: 0.02% or less, S: 0.01% or less, sol. Al: less than 1.0%, and N: less than 0.015%, the balance being Fe and incidental impurities, the steel sheet being such that the steel sheet includes a steel microstructure including, in area fraction, polygonal ferrite: 10% or less (including 0%), tempered martensite: 40% or more, fresh martensite: 20% or less (including 0%), bainitic ferrite having 20 or less internal carbides per 10 μm2: 3 to 40%, and, in volume fraction, retained austenite: 5 to 20%, and the steel sheet has SC≥0.5/SC≥0.3×100 of 20% or more.
With this invention, a deposit under a belt of a belt conveyor provided with a mobile machine is collected and moved to the outside of a rail. Provided is a cleaning device for cleaning a deposit having accumulated under a belt of a belt conveyor, the cleaning device including a collection means which is mounted on a mobile machine traveling on a rail provided along a conveyance direction of the belt conveyor, collects the deposit under the belt, and moves the deposit to the outside of the rail.
B65G 43/02 - Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load- carriers, e.g. for interrupting the drive in the event of overheating
Provided is a pressure vessel for high-pressure hydrogen gas capable of large-capacity hydrogen storage with a single pressure vessel while being easy to produce, transport, and install. A pressure vessel for high-pressure hydrogen gas comprises a steel container that is composed of two or more steel pipes or tubes connected by screw threads.
F17C 1/14 - Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of aluminiumPressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of non-magnetic steel
An information processing device including a target person information acquisition unit configured to acquire target person information about a target person, an exercise evaluation information acquisition unit configured to acquire exercise evaluation information indicating evaluation of an exercise of the target person, a storage unit configured to store a trained model that outputs instruction content in which, when the target person information and the exercise evaluation information are input, evaluation of exercise information of the target person is estimated to be improved, and a report output unit configured to input the target person information and the exercise evaluation information to the trained model and output an instruction report including the instruction content output from the trained model.
C10B 57/04 - Other carbonising or coking processesFeatures of destructive distillation processes in general using charges of special composition
C10L 5/04 - Raw material to be usedPretreatment thereof
G01N 21/27 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection
G01N 21/84 - Systems specially adapted for particular applications
Provided is a non-oriented electrical steel sheet with low high-frequency iron loss without addition of a large amount of alloying elements such as Cr, which causes a decrease in magnetic flux density, and without reduction of the sheet thickness, which causes a decrease in productivity. A non-oriented electrical steel sheet comprises a certain chemical composition containing 0.0005 mass % to 0.0050 mass % of Co, wherein an amount of N existing as AlN in a range from a surface of the non-oriented electrical steel sheet to a depth of 1/20 of a sheet thickness is 0.003 mass % or less, the surface has an oxide layer containing Fe and one or both of Al and Si, and an interface between the oxide layer and a steel substrate has an oxide film consisting of one or both of Al oxide and Si oxide.
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 purpose of the present invention is to provide a method for producing a friction stir welded joint. The present invention is a method for producing a friction stir welded joint, in which a tool tip is inserted into a butt surface of joining workpieces and the tool is moved in the joining direction while being rotated in order to effect stir welding between the joining workpieces. The joining workpieces are steel sheet having a component composition comprising, in mass%, C: 0.01-0.15%, Si: 0.01-0.50%, Mn: 0.05-1.00%, and Ni: 6.5-10.0%. In the friction stir, using A for the tool rotational speed (rpm) and B for the welding speed (mm/min), welding conditions are satisfied at which the value of X, which represents A/B for each pass, is 0 < X ≤ 8.0 and 50 ≤ A ≤ 500.
B23K 20/12 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by frictionFriction welding
Provided is a steel sheet having a TS of 780 MPa or more and less than 1,180 MPa and having high YS and excellent press formability of the inside of the steel sheet and at an edge of the steel sheet. This steel sheet has a base steel sheet having a predetermined composition, and a surface soft layer having a Vickers hardness of 84% or less with respect to the 1/4 position of the sheet thickness from the surface of the base steel sheet and satisfying formula (1), wherein the surface soft layer has a structure within a specific range, the structure at the 1/4 position of the sheet thickness of the base steel sheet is within a specific range, and the steel sheet has a tensile strength of 780 MPa or more and less than 1,180 MPa. Formula (1): 20≤X≤120-3800×[Sb]-1900×[Sn], provided that in formula (1), X is the thickness (μm) of the surface soft layer; and [Sb] and [Sn] are the content (mass%) of Sb and Sn in the steel, respectively.
A press forming method of forming a press formed part including: a top portion having a convex peripheral edge having a whole of or part of an outer peripheral edge curved outward in a convex shape; a side wall portion continuous to the top portion via a punch shoulder R portion; and a flange portion continuous to the side wall portion via a die shoulder R portion, the method includes: (a) forming a metal sheet into a preformed part; and (b) forming the preformed part formed in (a) into the press formed part having a target shape, wherein (a) performs forming such that a bending radius of the die shoulder R portion formed corresponding to at least the convex peripheral edge of the top portion of the preformed part is larger than a bending radius of the die shoulder R portion of the press formed part having the target shape.
A surface inspection method for a metal material according to the present invention is a surface inspection method for material in which a surface defect of the metal material is optically detected, the method including: an irradiating step of irradiating a surface of the metal material with light; an image capturing step of obtaining a plurality of images by capturing reflected light from the surface of the metal material by the light emitted in the irradiating step in two or more different wavelength bands; and a detecting step of detecting a surface defect present on the surface of the metal material from information of a relative signal intensity between the plurality of images obtained from a same position on the surface of the metal material in the image capturing step.
G01N 21/88 - Investigating the presence of flaws, defects or contamination
G01N 21/31 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
An electrical steel sheet provided with an insulating coating is disclosed. A pre-treatment liquid to be used on an electrical steel sheet having a forsterite coating on a surface thereof before applying an insulating coating treatment liquid containing a phosphate is also disclosed. When a phosphate concentration of the pre-treatment liquid is defined as A mass % in terms of H3PO4, a refractive index R of the pre-treatment liquid satisfies Formula (1):
An electrical steel sheet provided with an insulating coating is disclosed. A pre-treatment liquid to be used on an electrical steel sheet having a forsterite coating on a surface thereof before applying an insulating coating treatment liquid containing a phosphate is also disclosed. When a phosphate concentration of the pre-treatment liquid is defined as A mass % in terms of H3PO4, a refractive index R of the pre-treatment liquid satisfies Formula (1):
9.0×10−4×A+1.3340≤R (1).
C23C 22/78 - Pretreatment of the material to be coated
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
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
C23C 28/04 - 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 inorganic non-metallic material
A high strength steel plate having excellent ammonia SCC resistance and low-temperature toughness for use in storage tanks used to contain liquefied gas in energy transport ships. The steel plate has a defined chemical composition, and has hardness properties such that, at a 0.5 mm depth position from the surface of the steel plate, average hardness is 230HV0.1 or less and hardness variation is 30HV0.1 or less, a maximum value of hardness in the thickness direction is at a position 1.0 mm or more and ¼ or less of the thickness of the steel plate from the surface of the steel plate, and hardness variation in the thickness direction is 70HV1 or less. Further, the steel plate has a metallic microstructure where, at a 0.5 mm depth position from the surface of the steel plate, a volume fraction of bainitic microstructure is 90% or more.
A high strength steel plate having excellent ammonia SCC resistance and low-temperature toughness for use in storage tanks and the like used to contain liquefied gas in energy transport ships. The steel plate has a defined chemical composition, in particular including one or more of Cu: 0.01% to 0.5 %, Cr: 0.01% to 1.0%, Sb: 0.01% to 0.50%, or Sn: 0.01% to 0.50%, and the chemical composition satisfies a defined relationship of the Cu, Cr, Sb, and Sn content. Further, a hardness property at a 1.0 mm depth position from the surface of the steel plate is 300 HV or less, and the metallic structure at a ½ thickness position of the steel plate has a volume fraction of bainitic microstructure of 20% or more and a total volume fraction of ferritic microstructure and bainitic microstructure of 60% or more.
This steel sheet is set to have a TS of not less than 1180 MPa but less than 1470 MPa, and to have high YS, excellent ductility, excellent press formability of the inside of the steel sheet and the end part of the steel sheet, and high crack propagation resistance. The steel sheet is composed of a base steel sheet as a predetermined component composition, has Vickers hardness of 84% or less at the 1/4 position in the plate thickness from the surface of the base steel sheet, and has a surface soft layer that satisfies the following formula (1). The structure in the surface soft layer is set in a specific range, and the structure at the 1/4 position in the plate thickness of the base steel sheet is set in a specific range. The crack length progressing from a bent ridge line end part in the ridge line direction as a result of a 90-degree V bending test performed at a bending radius of 0.5 mm is 200 μm or less. The steel sheet exhibits EI of 6.0% or more as a result of a notching tension test performed after subjection to heat treatment at 170°C for 20 minutes, and exhibits El of 5.0% or more as a result of the notching tension test performed after introduction of the nominal tensile strain of 2% and subjection to the heat treatment at 170°C for 20 minutes. (1): 20≤X≤120-3800×[Sb]-1900×[Sn]
Provided is a framework member that has a tensile strength between 980 MPa and 1.8 GPa (both inclusive) and is excellent in axial collapse characteristics. This framework member uses a steel sheet having a base steel sheet. A cross-sectional shape thereof includes a top plate portion extending in the width direction and two vertical wall portions extending from both ends in the width direction of the top plate portion in a direction different from the extension direction of the top plate portion. The base steel sheet of the top plate portion includes, in the surface layer, a surface layer soft layer of which the Vickers hardness is 84% or less of that at a 1/4 sheet thickness position. The thickness of the surface layer soft layer satisfies the following formula (1). The tensile strength of the framework member is between 980 MPa and 1.8 GPa (both inclusive). (1): 20 ≤ X ≤ 0.1 × t - 3800 × [Sb] - 1900 × [Sn] In the formula, X is the thickness (μm) of the surface layer soft layer, t is the thickness (μm) of the base steel sheet, and [Sb] and [Sn] are the contents (mass %) of Sb and Sn in the base steel sheet, respectively.
C22C 18/04 - Alloys based on zinc with aluminium as the next major constituent
30.
CARBON MATERIAL–COATED GRAPHITE PARTICLES, LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE, LITHIUM ION SECONDARY BATTERY, AND PRODUCTION METHOD FOR CARBON MATERIAL–COATED GRAPHITE PARTICLES
There is provided carbonaceous substance-coated graphite particles that are excellent in all of output characteristic, fast charging characteristic, and cycle characteristic when used as a negative electrode material for a lithium ion secondary battery. The carbonaceous substance-coated graphite particles include graphite particles and a carbonaceous substance covering at least part of surfaces of the graphite particles. A mass reduction starting temperature when the carbonaceous substance-coated graphite particles are heated in a water vapor atmosphere is 800°C to 980°C, and a content of the carbonaceous substance is 0.1 to 15.0 parts by mass with respect to 100.0 parts by mass of the graphite particles.
Provided is a high-strength electric resistance welded steel pipe or tube having excellent SSC resistance. An absolute value of circumferential residual stress on a pipe or tube inner surface of the electric resistance welded steel pipe or tube is 10 MPa or more, and an absolute value of shear residual stress on the pipe or tube inner surface is 300 MPa or less. In a steel microstructure at a wall thickness center of a base metal portion of the electric resistance welded steel pipe or tube, a total volume fraction of ferrite and bainite is 90% or more and an average crystal grain size is 9.0 µm or less. In a steel microstructure at a position 0.1 mm radially outward from the pipe or tube inner surface of the base metal portion, a total volume fraction of ferrite and bainite is 95% or more.
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
B21C 37/08 - Making tubes with welded or soldered seams
B21C 37/30 - Finishing tubes, e.g. sizing, burnishing
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
32.
CARBONACEOUS MATERIAL-COATED GRAPHITE PARTICLES, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERIES, LITHIUM ION SECONDARY BATTERY, AND METHOD FOR PRODUCING CARBONACEOUS MATERIAL-COATED GRAPHITE PARTICLES
There is provided carbonaceous substance-coated graphite particles that exhibit an excellent cycle capacity maintaining characteristic when used as a negative electrode material for a lithium ion secondary battery. The carbonaceous substance-coated graphite particles include: graphite particles; and a carbonaceous substance covering at least part of surfaces of the graphite particles. An elastic modulus of the carbonaceous substance-coated graphite particles determined using a scanning probe microscope is not less than 10 GPa.
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 4/587 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
33.
STEEL SHEET FOR HOT PRESS FORMING, METHOD OF PRODUCING STEEL SHEET FOR HOT PRESS FORMING, HOT PRESSED MEMBER, AND METHOD OF PRODUCING HOT PRESSED MEMBER
A steel sheet for hot press forming that can reduce diffusible hydrogen content introduced in hot press forming without controlling the atmosphere dew point, and may be used to obtain a hot pressed member that has excellent post-coating corrosion resistance. The steel sheet includes a base steel sheet and a coated layer on both sides of the base steel sheet. The coated layer has a chemical composition containing Si: 7 mass % to 11 mass %, Mg: 0.6 mass % to 1.9 mass %, one or both of Ca and Sr: in total, 1.0% to 10% of Mg, and Fe: 0 mass % to 30 mass %, with the balance being Al and inevitable impurity. Concentration of Mg solute in Al phase in the coated layer is less than 1 mass %, and average thickness of the coated layer is 10 μm to 30 μm on each side of the base steel sheet.
For a steel sheet for hot pressing having a coating layer to prevent scale formation, adhesion of metals to heating equipment is reduced, liquid metal embrittlement cracking during hot press forming is prevented, and excellent post-painting corrosion resistance is achieved. A coated steel sheet for hot pressing includes: a base steel sheet; and a coating layer of 7 μm to 20 μm in thickness provided on both sides of the base steel sheet, wherein the coating layer is made of Ni or a Ni-based alloy, and a Zn content in the coating layer is 0 mass % to 10 mass %.
An additive manufacturing product including a steel matrix and ceramic particles dispersed in the steel matrix. The steel matrix has a chemical composition containing, in mass %, C: 0.030% or more and 0.800% or less, Si: 0.01% or more and 2.50% or less, Mn: 0.10% or more and 8.00% or less, P: 0.100% or less, S: 0.0200% or less, Al: 0.100% or less, N: 0.1000% or less, and O: 0.5000% or less, with the balance being Fe and inevitable impurity. The steel matrix has a steel microstructure where area fraction of pores is 0.50% or less, area fraction of martensite in a region excluding pores is 90% or more, average aspect ratio of prior austenite grains is 1.5 or more, and LHA/L is 2.0 or more. Melting point of the ceramic particles is 2000° C. or more.
Provided is a steel material having excellent cold forgeability. This steel material has a predetermined component composition and a structure in which the area ratio of martensite is 10.0% or less with the remainder comprising at least bainite, wherein the number density of sulfide-based inclusions having an equivalent circle radius of 1-20 μm is at least 10.0/mm2, and the number density of sulfide-based inclusions having an equivalent circle radius of at least 1 mm is at most 0.10/mm2.
This rolling load distribution calculation method for a rolling mill 10 includes: a step in which the contact arc length of at least an elastic restoration region or an elastic reduction region is calculated on the basis of Hooke's law with a material to be rolled 1 in a state of plane strain, the balance of forces within a roll bite of the rolling mill 10, and the distribution of rolling direction stress approximated by a function dependent on positional coordinates in a rolling direction of the rolling mill 10; and a step in which the rolling load distribution for at least the elastic restoration region or the elastic reduction region is calculated on the basis of the contact arc length.
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
B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
38.
AGING TREATMENT METHOD AND METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Provided is a grain-oriented electrical steel sheet having excellent magnetic properties. In an aging treatment method of subjecting a steel sheet before final cold rolling to aging treatment in a process of producing a grain-oriented electrical steel sheet, a total aging amount of carbon during a period from completion of cooling in annealing before the final cold rolling to biting in the final cold rolling is 0.02 μm to 0.5 μm in terms of diffusion distance of carbon.
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 continuous casting start timing determination method, a continuous casting facility operation method, a slab manufacturing method, a determining device, a continuous casting start determination system, and a display terminal device are provided. A continuous casting start timing determination method for determining a continuous casting start timing includes: a measurement step of measuring temperatures in a copper plate of a casting mold in the continuous casting facility, by use of a plurality of temperature sensors provided in a casting-direction determination position as a predetermined casting-direction position on the copper plate; and a determination step of determining the start timing based on a casting-direction position of a molten metal surface of molten steel, the casting-direction position being estimated based on measurement results in the measurement step and a width of a slab to be cast in the continuous casting facility.
The present invention provides a high-strength hot-dip galvanized steel sheet having a pleasing surface appearance without any missing plating and excellent delayed fracture resistance, and a production method therefor. The hot-dip galvanized steel sheet comprises: a base material steel sheet which has a component composition containing, in mass%, 0.06% to 0.30% C, 0.01% to less than 3.00% Si, 1.5% to 3.5% Mn, 0.1% or less (not including 0%) P, 0.003% or less (not including 0%) S, 0.1% or less (not including 0%) sol. Al, 0.007% or less (not including 0%) N, and 0.003% or less (not including 0%) O, with the remainder consisting of Fe and unavoidable impurities; and a zinc-based plating layer which is formed on the surface of the base material steel sheet and in which the plating coating mass per surface is 20-120 g/m2. The total hydrogen released at 200-350°C is 0.20 mass ppm or less when measured using dynamic temperature analysis.
The present invention provides a hot-dip galvanized steel sheet that is high-strength and that has a pleasing surface appearance without any missing plating and excellent delayed fracture resistance, and a production method therefor. The hot-dip galvanized steel sheet comprises: a base steel sheet which has a component composition containing specific amounts of C, Si, Mn, P, S, sol. Al, N, and O, and further containing specific amounts of specific optional elements, with the remainder consisting of Fe and unavoidable impurities; and a zinc-based plating layer which is formed on a surface of the base steel sheet. The amount of inclusion groups satisfying specific conditions in the base steel sheet is 10 groups/mm2LHH of 0.20 mass ppm or less, and the tensile strength of the hot-dip galvanized steel sheet is 780 MPa or more.
Provided is a steel bar having excellent cold forgeability after being subjected to spheroidizing annealing. In one embodiment, in a steel bar containing predetermined amounts of Cr, Ni, and Cu, the length of the major axis of a specific cementite particle having an aspect ratio of 2.0 or less when the shape of cementite particles observed in m observation fields (m being an integer of 2 or more) in a cross section perpendicular to the length direction is elliptically approximated is 10.0 μm or less in all of the m observation fields, and variations in the Cu content and the Ni content measured in the m observation fields are small. In another embodiment, in a steel bar containing predetermined amounts of Cr, Ni, and Cu, among the equivalent circle diameters of the cementite particles observed in n observation fields (n being an integer of 2 or more) in a cross section perpendicular to the length direction, the maximum value of the equivalent circle diameter is 15.0 μm or less in every observation field, and the variation in the maximum value is small.
A breakout prediction method according to the present invention comprises: a step for inputting the dimensions of a cast slab drawn out from a mold in a continuous casting machine; a step for detecting the temperature of the mold by means of a plurality of thermometers embedded in the mold; a step for executing interpolation processing on the detected temperatures detected by the plurality of thermometers, in accordance with the dimensions of the cast slab; a step for calculating the temperature change amount by comparing the temperature with the temperature before a first period; a step for acquiring a standard deviation of the temperature change amount for each of the thermometers in a second period; a step for standardizing the temperature change by dividing the temperature change amount by the standard deviation; a step for calculating, on the basis of the temperature change amount calculated by executing the interpolation processing, a component in a direction orthogonal to an influence coefficient vector obtained from the principal component analysis as a degree of deviation from a normal operation in which no breakout is occurring; and a step for predicting the breakout on the basis of the degree of deviation.
POWDER PROPERTY-MODIFYING METHOD, PRODUCTION METHOD FOR WATER-CONTAINING BULK MATERIAL, WATER-CONTAINING BULK MATERIAL, AND GRANULATION METHOD FOR RAW MATERIAL FOR SINTERING
Provided are methods for solving various problems that are attributed to moisture contents when handling water-containing powders. One method is a powder property-modifying method used when handling a water-containing bulk material including a mineral ore, coal, and limestone, and includes adding an active component of a chemical agent whose main component is at least one selected from a polymer flocculant, an inorganic flocculant, and a polymer water absorption material, in an amount of 0.001 to 0.07% by mass with respect to the mass of the bulk material, in which water inside the bulk material is retained in a bridge structure formed between the chemical agent and a powder composing the bulk material. Another method is a production method for a water-containing bulk material that is transported via at least one selected from a vessel, a transporter vehicle, a loading heavy machine, a delivering heavy machine, a conveyor belt, and a storage tank. This production method includes modifying such water-containing bulk material with the above modifying method.
Ridging caused when handling steel containing a large amount of alloying elements such as Si and Al in a low-speed hot rolling process is suppressed. A method of producing a hot-rolled steel sheet for a non-oriented electrical steel sheet comprises: producing a steel slab having a certain chemical composition and a thickness of 50 mm to 200 mm by continuous casting; conveying the steel slab to a hot rolling line while maintaining a surface temperature of the steel slab at 800° C. or more; and performing hot rolling in which the steel slab is sequentially subjected to rough rolling, reheating treatment, and finish rolling in the hot rolling line to obtain a hot-rolled steel sheet, wherein the hot rolling is performed under specific conditions.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
A welded joint formed by performing projection welding on a high-strength coated steel sheet and a nut, includes a content of solid solution Mn in a first region in a surface layer of the steel sheet on an outermost periphery of a weld is 40% or less of a content of solid solution Mn in a second region in a central region in a thickness direction of the steel sheet on the outermost periphery of the weld, and a content of solid solution Mn in a third region in the surface layer of the steel sheet on an innermost periphery of the weld is 40% or less of a content of solid solution Mn in a fourth region in the central region in the thickness direction of the steel sheet on the innermost periphery of the weld.
Provided are a method with which it is possible to more accurately evaluate delayed fracture at a shear end surface, and a method for manufacturing a press-molded article using the aforementioned method. A method for evaluation delayed fracture, with which the delayed fracture characteristics of a shear end surface of a metal plate are evaluated, includes: testing whether delayed fracture has occurred in the application of molding strain and load stress to the shear end surface of the metal plate; deriving, on the basis of the test, evaluation information pertaining to whether delayed fracture has occurred with respect to the molding strain and the load stress at each evaluation position from among two or more evaluation positions following the plate direction of the shear end surface; and deriving, from the derived evaluation information, an evaluation standard for a delayed fracture evaluation in which the evaluation position, the molding strain, and the load stress are used as variables.
A method for predicting delayed fracture in a press-molded article according to the present invention comprises: calculating the stress distribution and the strain distribution in a press-molded article (S1); calculating the stress gradient in the direction of crack propagation due to delayed fracture in sites in the press-molded article that are at risk for delayed fracture (S3); setting the hydrogen concentration distribution corresponding to the strain distribution in the press-molded article (S5); performing hydrogen diffusion analysis on the press-molded article on the basis of the stress distribution and the hydrogen concentration distribution, and calculating the hydrogen concentration distribution after hydrogen diffusion (S7); and predicting whether or not delayed fracture occurs in a delayed fracture risk site on the basis of a delay fracture determination condition that is based on stress, strain, and hydrogen concentration at the stress gradient of the delayed fracture risk site, and on the basis of stress, strain, and hydrogen concentration at the delayed fracture risk site (S9).
The present invention provides electric furnace equipment that prevents overheating of molten metal by changing heat transfer between the molten metal and slag from heat conduction to forced convective heat transfer, and that improves production yield without making the equipment oversized. This electric furnace equipment stores molten metal, slag, a metal raw material, and an auxiliary raw material in layers, and enables the discharge of the molten metal and the slag. The electric furnace equipment comprises: an arc furnace having a bottom part, a furnace wall, and a furnace lid; and an electromagnetic stirrer disposed at a prescribed position on the bottom part or a side surface of the arc furnace in order to enable stirring of the molten metal that is in the arc furnace.
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
C21B 11/10 - Making pig-iron other than in blast furnaces in electric furnaces
C21C 5/52 - Manufacture of steel in electric furnaces
A method for operating an electric furnace is provided, in which, when a raw metallic material is melted in the electric furnace to produce a molten metal, high productivity is obtained and the refractory wear is less. The method for operating an electric furnace comprises stacking and accommodating, inside the electric furnace, a molten metal, slag, a raw metallic material, and a subsidiary raw material in this order and continuously discharging a molten metal and slag, wherein: the electric furnace comprises a bottom part, furnace walls, a furnace lid, and a means for molten-metal stirring; and the input power per surface of the molten metal is 300 kW/m2 or greater and the density of the power of stirring the molten metal by the stirring means is in the range of 5-100 W/t.
A method for producing a film according to the present invention comprises: a spectral reflectance calculation step for calculating a spectral reflectance from reflected light obtained by reflecting light by means of a film; an information calculation step for calculating, from the calculated spectral reflectance, information pertaining to the number of extreme values of the spectral reflectance and the wavelength-position relationship between the extreme values in a prescribed wavelength range; and a control step for controlling a film formation condition on the basis of the calculated information.
The present invention provides a method and an apparatus for manufacturing reduced iron briquettes that reuse DRI, fine powder, or the like which failed to be compacted into HBI, and that make it possible to expect improvement of yield of an iron source compared with a related art. A method for producing reduced iron briquettes according to the present invention comprises hot compression molding and briquetting reduced iron clusters composed of pellet-shaped reduced iron containing an iron component, wherein a reduced iron-derived powder is reheated, and the reheated reduced iron-derived powder is returned to the reduced iron clusters. An apparatus for producing reduced iron briquettes according to the present invention is for producing reduced iron briquettes by hot compression molding reduced iron clusters composed of pellet-shaped reduced iron containing an iron component, the apparatus comprising: sieve equipment for sieving the manufactured reduced iron briquettes into reduced iron briquettes as a product and a reduced iron-derived powder that is not the product; and a reheating facility for reheating the reduced iron-derived powder that is not the product and returning the reheated reduced iron-derived powder to the reduced iron clusters.
2325222222222 and that has a liquid phase ratio of 10 mass% or higher at 1000°C is adhered to the surface of a Cu-Sn-containing cast slab such that the mass per unit area is in the range of 50 g/m2to 5000 g/m2, a second flux that has a liquid phase ratio of 0 mass% at 1400°C or lower is adhered to the surface of the Cu-Sn-containing cast slab such that the mass per unit area is in the range of 50 g/m2to 5000 g/m2, and then the Cu-Sn-containing cast slab is heated at a temperature of 1000-1400°C; and a hot working step in which the Cu-Sn-containing cast slab is subjected to hot working.
B21B 45/00 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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
B21B 45/06 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling of strip material
C21D 1/70 - Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
Provided is an operation assistance method, which is used in ironworks having a blast furnace section, a coke section, and an energy section and executed by an information processing device, comprising: inputting data of blast furnace operation specifications influencing the energy section and data of a coke quantity influencing the energy section into a learning model; estimating a total cost by the learning model on the basis of the input data of the blast furnace operation specifications and the input data of the coke quantity; and outputting the estimated total cost. The learning model is a model trained on the basis of record data including records of the blast furnace operation specifications, the coke quantity, and the total cost.
Provided is an operation assistance method, which is used in ironworks having a blast furnace section, a steel manufacturing section, and an energy section and executed by an information processing device, comprising: inputting data of blast furnace operation specifications and ion distribution influencing the steel manufacturing section and energy section into a learning model; estimating a total cost by the learning model on the basis of the input data of the blast furnace operation specifications and ion distribution; and outputting the estimated total cost. The learning model is a model trained on the basis of record data including records of the blast furnace operation specifications and the total cost.
Provided is a non-oriented electrical steel sheet with low high-frequency iron loss without addition of a large amount of alloying elements such as Cr, which causes a decrease in magnetic flux density, and without reduction of the sheet thickness, which causes a decrease in productivity. A non-oriented electrical steel sheet comprises a certain chemical composition containing 0.0005 mass % to 0.0050 mass % of Co, wherein at at least one surface of the non-oriented electrical steel sheet, an amount of N existing as AlN in a range from the surface to a depth of 1/20 of a thickness of the non-oriented electrical steel sheet is 0.003 mass % or less, and the surface has an oxide layer containing one or both of Al and Si and having a thickness of 80 nm to 200 nm.
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 grain-oriented electrical steel sheet with good film adhesion. Among the elements present at grain boundaries between ceramic particles contained in a base film of the grain-oriented electrical steel sheet, either or both of S and Se elements are contained in a range of 0.02 at % to 2.00 at %.
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 highly productive submerged arc welding method ensuring excellent mechanical properties when welding thick steel plates at high heat inputs in the fields of shipbuilding, construction and so on; a weld joint produced using such welding method; and a production method for such weld joint. The welding method is a one-sided submerged arc welding method for welding two butted steel plates, in which grooves are formed on both a front and a back surface side of the steel plates, root faces are formed between the groove on the front surface side and the groove on the back surface side, and welding is performed from the front surface side. It is preferred that a root face height be 2 to 5 mm, and that a groove depth on the back surface side be 2 to 5 mm.
Provided is a method for melting a metal raw material, wherein a condition for melting a metal raw material partially or entirely composed of reduced iron by using a submerged arc furnace (SAF) is set and stable energization is performed, thereby making it possible to melt a large amount of the metal raw material. This method for melting a metal raw material by using an electric furnace includes stacking and accommodating molten iron, molten slag, a metal raw material, and an auxiliary raw material in the electric furnace, and discharging the molten iron and the molten slag, wherein when an electric current is supplied to heat the molten metal by an arc or through the molten slag and the metal raw material, the in-furnace resistivity of the electric furnace is in the range of 0.01-0.02 (Ωm).
C21B 11/10 - Making pig-iron other than in blast furnaces 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
In hot-briquetting of reduced iron, a method which is for producing reduced iron briquettes and which makes it possible to increase the apparent density and strength thereof is proposed. Provided is a method for producing reduced iron briquettes by briquetting, by hot compression molding with molding rollers, a reduced iron group which is constituted by pellet-shaped reduced iron containing an iron component, wherein the rotation speed of the molding rollers and/or the gap between the molding rollers are changed in accordance with the T.Fe content of the pellet-shaped reduced iron, and then the hot compression molding is carried out with respect to the reduced iron group. In a preferred embodiment, with an increasing gangue component ratio, the rotation speed of the molding rollers is changed so as to be slower and/or the gap between the molding rollers is changed so as to be smaller.
Provided is a method for producing reduced iron briquettes enabling improvement of apparent density and strength in briquetting of reduced iron by hot molding. In the method for producing reduced iron briquettes of the present invention, when groups of reduced iron composed of reduced-iron pellets containing an iron component are subjected to hot compression molding, a control step for controlling the particle size distribution of the groups of reduced iron is performed, and then hot compression molding is performed on the groups of reduced iron having the particle size distribution thus controlled. A device for producing reduced iron briquettes of the present invention includes: a reduced iron production facility for producing reduced-iron pellets containing an iron component to form the groups of reduced iron; a pulverizing facility for pulverizing the groups of reduced iron; a classification facility for sieving the groups of pulverized reduced iron by sieves having a plurality of mesh sizes; a mixing facility for mixing the groups of reduced iron having a plurality of levels of grain size after the sieving so as not to be biased for each particle size in a hot compression molding mold; and a reheating facility for heating the mixed groups of reduced iron to a molding temperature required for the hot compression molding.
A method includes measuring three-dimensional coordinates of a point from a remote position even in a case where the point is in a dangerous zone where a person cannot enter and directly measure coordinates. The method is for measuring, from an image, a three-dimensional absolute position of a measurement point present on a plane including any three points on an object to be measured by using a three-dimensional orthogonal coordinate system. The method includes measuring a relative position between a reference point present on the plane and a camera, acquiring an image by imaging the measurement point by the camera, calculating, from the image, three-dimensional relative position coordinates of the measurement point while using a lens position of the camera as an origin, and calculating the three-dimensional absolute position of the measurement point from the relative position and the three-dimensional relative position coordinates.
An estimation method of the depositional shape of a charged material inside a blast furnace formed after coke inside the blast furnace is consumed by using a burner when the blast furnace is caused to start up. The estimation method includes estimating the depositional shape of a charged material inside a blast furnace in a blowing down with lowering stock level, estimating a charged region of coke inside the blast furnace from the estimated depositional shape of the charged material inside the blast furnace and from the shape of a solidified layer on a bottom part inside the blast furnace, estimating an amount of coke inside the blast furnace that is consumed by using the burner, and estimating, from the estimated amount of the coke inside the blast furnace, the depositional shape of a charged material inside the blast furnace formed after consumption of the coke inside the blast furnace.
C10B 57/04 - Other carbonising or coking processesFeatures of destructive distillation processes in general using charges of special composition
C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
68.
ENERGY OPERATION SUPPORT DEVICE, ENERGY OPERATION SUPPORT SYSTEM, ENERGY OPERATION DEVICE, DISPLAY TERMINAL DEVICE, ENERGY OPERATION SUPPORT METHOD, AND STEEL MILL OPERATION METHOD
This energy operation support device is an energy operation support device in a steel mill, and is provided with: an optimization unit that optimizes the operation of energy utilities in facilities within the steel mill; and an upper limit relaxation unit that sets an operational upper limit, which is an upper limit on the operation, for a facility upper limit, which is the upper limit of the facility capacity output of the facilities. The upper limit relaxation unit sets a prescribed ratio to the facility upper limit and thereby sets the operational upper limit at a target time or a target calculation period. The objective function of optimization calculation in the optimization unit includes the total energy operation cost of the steel mill and an adjustment parameter for the energy utilities, which have an upper limit equal to the difference between the facility upper limit and the operational upper limit.
G06Q 10/04 - Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
C10B 57/04 - Other carbonising or coking processesFeatures of destructive distillation processes in general using charges of special composition
C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
The present invention presents a novel index for a biomass-derived raw material that replaces some of coal to be used for the production of coke for use in blast furnaces, and provides a means by which high-strength coke is produced even when the biomass-derived raw material is added to coal. Carbonized biomass having a shrinkage in the temperature range from 600°C to 1000°C of 4.0-10.0% is mixed with a coal blend to produce coke.
C10B 57/04 - Other carbonising or coking processesFeatures of destructive distillation processes in general using charges of special composition
C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
71.
MAKE-UP/BREAK-OUT EVALUATION METHOD FOR THREADED JOINT FOR OIL COUNTRY TUBULAR GOODS
A make-up/break-out evaluation method that makes it possible to evaluate the seizure resistance of a threaded joint for oil country tubular goods accurately without performing a test using a threaded joint with an actual length. When performing test with respect to the threaded joint for oil country tubular goods formed by attaching a pin lower portion to box upper portion with its axis directed vertically, a test pin formed by a pin shorter than an evaluation target pin used as test pin; a weight attached to test pin upper portion; mass of the weight is equal to or greater than a mass obtained by subtracting the test pin mass from the evaluation target pin mass; an initial set position for test pin is set where test pin five crests or ¼ of all test pin crests, whichever is greater, or more are exposed from the box upper end face.
Provided is a polyester film or the like, enabling stable production while saving energy in any manufacturing stages of a film, a laminated metal plate, and a laminated metal container. Also provided is a polyester film or the like, having sufficient corrosion resistance even when subjected to molding processing to form a two-piece can or the like, for example. This polyester film contains a polyester including polyethylene terephthalate as a component. The net strength of the polyester film in a pole figure which is obtained by X-ray diffractometry and which represents a crystal orientation distribution satisfies a predetermined condition.
B29C 55/06 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
B32B 15/09 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising polyesters
A wound core with low transformer iron loss and good magnetic characteristics without using two or more types of materials with different magnetic characteristics. The wound core includes a grain-oriented electrical steel sheet as a material and has a flat surface portion, a corner portion adjacent to the flat surface portion, a lap portion in the flat surface portion, and a bent portion in the corner portion, and the ratio of the length of the outer circumference to the length of the inner circumference (the length of the outer circumference/the length of the inner circumference) is 1.80 or less when viewed from the side, and the grain-oriented electrical steel sheet has a magnetic flux density B8 in the range of 1.84 T to 1.91 T at a magnetic field strength H of 800 A/m and has a specified iron loss deterioration rate of 1.50 or less under compressive stress.
H01F 3/02 - Cores, yokes or armatures made from sheets
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
74.
HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING SAME
A high-strength steel sheet having a tensile strength of 1320 MPa or more is disclosed. The above-described high-strength steel sheet includes a specific component composition including Ti and the like, wherein a diffusible hydrogen amount in steel is 0.50 ppm by mass or less, tempered martensite and bainite are 70.0 to 95.0%, fresh martensite is 15.0% or less, retained austenite is 5.0 to 15.0%, an average grain size of a precipitate A, which is a carbide, nitride, or carbonitride containing at least one selected from the group consisting of Ti, Nb, and V is 0.001 to 0.050 μm, a number density NS of the precipitate A having a major axis of 0.050 μm or less is 10/μm2 or more, and a ratio of the number density NS and a number density NL of the precipitate A having a major axis of more than 0.050 μm is 10.0 or more.
Provided is a galvanized steel sheet having high strength, excellent ductility, excellent strain hardenability in a low strain range, and excellent strain hardenability in a high strain range. A base steel sheet has a defined chemical composition and a steel microstructure as follows: area fraction of ferrite: 20.0% or more and 90.0% or less, area fraction of bainitic ferrite: 4.0 % or more and 60.0% or less, area fraction of tempered martensite: 20.0% or less (including 0%), area fraction of retained austenite: 3.0% or more, area fraction of fresh martensite: 20.0% or less (including 0%), SF+SBF: 55.0% or more and 95.0% or less, SMA1: 4.0% or more, and SMA2: 1.5% or more.
Provided is a pallet monitoring system capable of identifying a grate bar that is likely to fall out before said grate bar falls out. Provided is a pallet monitoring system for monitoring a pallet of a sintering machine in which a floor surface is configured from a plurality of grate bars, said pallet monitoring system comprising: an imaging unit for generating image data by imaging the plurality of grate bars; a calculation unit for calculating angles of inclination of each of the plurality of grate bars from the image data; and a determination unit for determining whether each of the angles of inclination is at or above a predetermined threshold value.
F27B 21/14 - Arrangement of controlling, monitoring, alarm or like devices
C22B 1/20 - SinteringAgglomerating in sintering machines with movable grates
F27B 9/24 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatmentFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path being carried by a conveyor
77.
HOT-ROLLED STEEL SHEET AND METHOD OF PRODUCING SAME, AND ELECTRIC RESISTANCE WELDED STEEL PIPE OR TUBE AND METHOD OF PRODUCING SAME
It is provided a hot-rolled steel sheet as the material of an electric resistance welded steel pipe or tube with high strength and excellent workability and toughness, which is suitable for a machine structural steel pipe or tube used as a part of an automobile, construction machinery, or industrial machinery. The hot-rolled steel sheet has a predetermined chemical composition and has a steel microstructure at the sheet thickness center with a volume fraction of bainite of 90 % or more and the balance containing one or more of ferrite, pearlite, martensite, and austenite. The above steel microstructure at the sheet thickness center further has an average grain size of 10.0 m or less, a volume fraction of crystal grains with a grain size of 40.0 m or more, and a number density of Ti-based inclusions with a long diameter length of 5.0 m or more of 20 pieces/mm2 or less.
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
B21C 37/08 - Making tubes with welded or soldered seams
B22D 11/00 - Continuous casting of metals, i.e. casting in indefinite lengths
B23K 13/00 - Welding by high-frequency current heating
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
C21D 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for welded joints
The present disclosure proposes a grain-oriented electrical steel sheet that reduces iron loss by controlling the magnetic domain structure and can maintain the iron loss reduction effect even after subjection to stress relief annealing. The grain-oriented electrical steel sheet comprising a predetermined chemical composition and a local area having a misorientation angle of 1.5 degrees or more from surrounding crystals and extending linearly in a direction crossing a rolling direction on at least one of front and back surfaces of the steel sheet, wherein the local area has a volume fraction of 0.1% or more and 2.0% or less and a residual stress of 100 MPa or less, and the surface having the local area has an average amount of roughness on a steel substrate being less than 5 μm.
A high-strength steel sheet having a tensile strength of 1320 MPa or more is disclosed. The above-described high-strength steel sheet includes a specific component composition, wherein a diffusible hydrogen in steel is 0.50 ppm by mass or less, tempered martensite and bainite are 70.0% or more, fresh martensite is 15.0% or less, iron-based carbides existing in the tempered martensite and the bainite have an average equivalent circular radius of 0.10 μm or less and an average aspect ratio of 4.5 or less, and a proportion p of tempered martensite and bainite including iron-based carbides, which have major axes facing the same direction within a range of 0 to 10°, at a number density of 7 to 35/μm2 among the tempered martensite and the bainite is 25 to 70%.
Provided are a repair method and a repair device for a coke oven, with which, when bricks that form a wall of a combustion chamber of a coke oven are to be repaired while hot, an adjacent combustion chamber and remaining bricks in a portion not being repaired that are left without being dismantled will not bulge toward a carbonization chamber after the repair. The present invention is a coke oven repair method including: a confirmation step in which an oven wall of a combustion chamber that is adjacent to a combustion chamber to be restacked is examined, using a three-dimensional measuring instrument through an oven port, for unevenness to confirm whether the amount of bulging of the oven wall of the adjacent combustion chamber is less than a prescribed value; a restacking step in which, if it was confirmed in the confirmation step that the amount of bulging of the oven wall of the adjacent combustion chamber is less than the prescribed value, parts requiring repair of an oven wall of the combustion chamber to be restacked are dismantled, and oven wall bricks and binder bricks are stacked anew in the scope of the dismantling; and a step in which a pre-formed oven wall refractory aggregate and a pre-formed ceiling section refractory aggregate are used as a newly stacked oven wall and a ceiling section in the combustion chamber to be restacked.
Provided is a repair method for a coke oven that involves repairing the bricks that constitute the walls of a combustion chamber of a coke oven in a hot state such that adjacent combustion chambers and the remaining bricks of an unrepaired portion that has not been dismantled do not protrude toward carbonization chambers after the repair. According to the present invention, a repair method for a coke oven involves repairing the bricks of a combustion chamber of the coke oven by re-laying two or more oven wall bricks and binder bricks along the longitudinal direction of the oven from an oven opening in a hot state. The repair method includes a confirmation step for observing the evenness of the oven walls of combustion chambers adjacent to the combustion chamber to be re-laid from the oven opening using a three-dimensional measurement apparatus and confirming that the protrusion of the oven walls of the adjacent combustion chambers is below a prescribed value and, when it has been confirmed at the confirmation step that the protrusion of the oven walls of the adjacent combustion chambers is below the prescribed value, a re-laying step for dismantling a portion of the oven wall of the combustion chamber to be re-laid that requires repair and laying new oven wall bricks and binder bricks in the dismantled area.
C10B 29/06 - Preventing or repairing leakages of the brickwork
82.
HOT-ROLLED ANNEALED SHEET FOR NON-ORIENTED ELECTROMAGNETIC STEEL SHEET, METHOD FOR MANUFACTURING SAME, AND METHOD FOR MANUFACTURING NON-ORIENTED ELECTROMAGNETIC STEEL SHEET
According to the present invention, a steel slab containing a predetermined amount of C, Si, Mn, P, S, Al, N, O, Sn, and Sb is heated under a predetermined condition, hot rolled, hot annealed, shot blasted and pickled, or the steel slab is heated under a predetermined condition, hot rolled, hot annealed, brush ground and pickled such that the average grain size in a cross section in the rolling direction of a steel sheet after the pickling is 40-250 μm and the integrated intensity of Fe-Al-based oxides in the surface layer of the steel sheet measured by X-ray diffraction is 200 cps∙degree or less, thereby obtaining a hot-rolled annealed sheet for a non-oriented electromagnetic steel sheet, which enables the prevention of sheet breakage during cold rolling and exhibits excellent magnetic properties after cold-rolled sheet annealing. In addition, a non-oriented electromagnetic steel sheet is manufactured using the hot-rolled annealed 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
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
According to the present invention, a metal material is electrolyzed in a flow of electrolyte solution. This makes it possible to correctly and conveniently extract deposits and/or inclusions (deposits or the like) that are in the metal material. The electrolysis is preferably performed such that the electrolyte solution flows along at least a portion of an electrolysis surface that is a surface of the metal material that contacts the electrolyte solution. The flow speed of the electrolyte solution that flows along the electrolysis surface is preferably at least 0.48 mm/s. The metal material and the electrolyte solution are preferably contained in an electrolytic bath, and the flow of electrolyte solution is preferably produced by infusion and discharge of the electrolyte solution into/from the electrolytic bath.
An automotive component design method according to the present invention comprises: obtaining an automotive component model that models an automotive component that receives a compressive load in the longitudinal direction during an automotive collision (S1); setting a design space for a to-be-designed portion, which is a portion to be designed (S3); generating a to-be-designed-portion model by modeling the set design space with shell elements and/or solid elements (S5); setting, in the automotive component model, an objective function that maximizes the buckling load of the primary buckling mode obtained by linear buckling analysis (S7); performing optimization analysis to find the optimal shape of the to-be-designed-portion model that satisfies the set objective function (S9); and determining the shape of the to-be-designed portion on the basis of the optimal shape of the to-be-designed-portion model (S11).
To provide a method for assessing a slab with which it is possible to assess, from the component concentration of molten steel manufactured by a continuous casting apparatus, the risk of a slab manufactured using the molten steel cracking into two pieces. This method for assessing a slab that contains Ti, C, Si, and Mn as components and that is manufactured using a continuous casting apparatus comprises: a first step for obtaining, using the component concentration of molten steel injected into the mold of the continuous casting apparatus, an index for the liquid phase rate of scale produced in the slab; and a second step for determining, if the index for the liquid phase rate of the scale is equal to or greater than a predetermined threshold value, that the slab has a risk of cracking into two pieces.
This method for repairing a coke oven comprises: a confirmation step for observing, by using a three-dimensional measuring instrument from an oven port, the unevenness of a furnace wall of an adjacent non-replacement combustion chamber adjacent to one side surface of one replacement combustion chamber or a plurality of contiguous replacement combustion chambers, and of a furnace wall of an adjacent non-replacement combustion chamber adjacent to the other side surface, and confirming that the protruding amount of each of the furnace walls of the adjacent non-replacement combustion chambers is less than a prescribed value; a replacement step for, when it is confirmed in the confirmation step that the protruding amount of each of the furnace walls of the adjacent non-replacement combustion chambers is less than the prescribed value, dismantling a portion requiring repair of a furnace wall of the one replacement combustion chamber or the plurality of contiguous replacement combustion chambers, and stacking new furnace wall bricks and binder bricks in the dismantled range; and a step for using a furnace wall refractory aggregate molded in advance and a ceiling part refractory aggregate molded in advance as the furnace wall and a ceiling part for replacement to be new in the replacement combustion chamber.
The purpose of the present invention is to provide: a steel sheet having high strength, high ductility, and low yield elongation; and a method for manufacturing the same. This steel sheet has a component composition containing, in mass%, 0.03-0.15% of C, 0.05% or less of Si, 0.10-0.60% of Mn, 0.025% or less of P, 0.020% or less of S, 0.20% or less of Al, 0.0001-0.0200% of N, and 0.005-0.030% of Nb, the remaining portion being Fe and unavoidable impurities. In the steel sheet, the area percentage of martensite is 0.5-10.0%, the area percentage of the sum of perlite, bainite, and granular cementite is 5-30%, and the remaining portion is ferrite. In the granular cementite, the area percentage of granular cementite having a maximum particle size of 3 µm or less is 1.0% or more with respect to the whole structure.
The purpose of the present invention is to provide: a steel sheet having high strength, high ductility, and low-yield elongation; and a method for manufacturing same. The steel sheet has a composition containing, in mass%, 0.03-0.15% of C, 0.05% or less of Si, 0.10-0.60% of Mn, 0.025% or less of P, 0.020% of less of S, 0.20% or less of Al, 0.0001-0.0200% of N, 0.005-0.030% of Nb, and more than 0.020% and no more than 0.200% of Cu, with the remainder comprising Fe and inevitable impurities, has a microstructure containing 80% or more of ferrite in area fraction, and has a yield strength of 500 MPa or more, a tensile strength of 500 MPa or more, an HR30T of 68 or more, a break elongation of 15% or more, and a yield elongation of 4.5% or less.
A method for recycling a magnesia carbon brick includes bringing a used magnesia carbon brick containing an aluminum-containing substance into contact with water, followed by subjecting the used magnesia carbon brick to a dehydration treatment and pulverizing the used magnesia carbon brick subjected to the dehydration treatment for reusing as a refractory raw material. The corrosion resistance of a refractory made of a used magnesia carbon brick is improved when the used magnesia carbon brick is reused as a refractory raw material.
An analysis accuracy evaluation method includes: generating, based on measurement data obtained by measurement of a shape after die release of an actual press-formed part press-formed with a predetermined tool of press forming by utilization of an actual blank taken from a metal sheet having shape variation; generating an actual blank model having a same shape as the actual blank based on measurement data; acquiring a press-formed part shape after die release as an analysis press-formed part shape by performing, by using the actual blank model, a press-forming analysis of when press forming is performed with a model of a tool of press forming which model has a same shape as the predetermined tool of press forming; and comparing the actual press-formed part shape and the analysis press-formed part shape, obtaining a deviation amount of shape change of the both shapes, and evaluating accuracy of the press-forming analysis.
G06F 119/02 - Reliability analysis or reliability optimisationFailure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
91.
WRINKLE GENERATION DETERMINATION INDEX ACQUISITION METHOD, WRINKLE GENERATION DETERMINATION METHOD, WRINKLE GENERATION DETERMINATION DEVICE, AND WRINKLE GENERATION DETERMINATION PROGRAM FOR PRESS FORMED PART
A wrinkle generation determination method for a press formed part includes acquiring, for each load ratio in in-plane biaxial directions, a relationship between an in-plane biaxial strain generated in a process of inducing out-of-plane buckling in a measurement part and a load, acquiring an in-plane biaxial strain at a point where a primary differential coefficient of an in-plane uniaxial strain on which a compressive load acts becomes local maximum as a stable behavior limit strain, and acquiring a stable behavior limit line that will be an index for wrinkle generation under a biaxial stress condition by plotting, on two-dimensional coordinates, the stable behavior limit strain acquired for each load ratio in a biaxial stress test in which a load in the in-plane biaxial directions is applied to a cruciform test piece for biaxial test so as to induce out-of-plane buckling in the measurement part.
B21D 22/02 - Stamping using rigid devices or tools
G05B 19/4155 - Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by programme execution, i.e. part programme or machine function execution, e.g. selection of a programme
92.
COLD IRON SOURCE MELTING RATIO ESTIMATION DEVICE, CONVERTER-TYPE REFINING FURNACE CONTROL DEVICE, COLD IRON SOURCE MELTING RATIO ESTIMATION METHOD, AND MOLTEN IRON REFINING TREATMENT METHOD
A cold iron source melting ratio estimation device that estimates a melting ratio of a cold iron source charged into a converter-type refining furnace during refining of molten iron in the converter-type refining furnace. The device includes: an input section to which measured values of in-furnace information or estimated values of the in-furnace information is input, the in-furnace information including a molten iron temperature and a carbon concentration in the molten iron during refining; a database section that stores a model equation and parameters related to a refining reaction of the molten iron in the converter-type refining furnace; a computation section that computes the melting ratio of the cold iron source using the measured values or the estimated values input to the input section; and an output section that displays the melting ratio of the cold iron source computed by the computation section.
C21B 13/00 - Making spongy iron or liquid steel, by direct processes
93.
METHOD FOR CONTROLLING SCALE GENERATION AMOUNT OF METAL MATERIAL IN HEATING FURNACE, SCALE GENERATION AMOUNT CONTROL DEVICE, AND HEATING FURNACE OPERATION METHOD
Provided are: a method for controlling a scale generation amount of a metal material to control the scale generation amount to within an appropriate range in a case where a carbon dioxide discharge amount is to be reduced by using hydrogen or ammonia as a fuel gas of a heating furnace for heating the metal material; a scale generation amount control device; and a heating furnace operation method. According to the method for controlling a scale generation amount of a metal material in a heating furnace, the metal material is burner-heated using, as a fuel, a hydrogen-based gas containing in full either one or both of hydrogen and ammonia, the flow rate of the hydrogen-based gas used as the burner heating fuel is set as a heating furnace operating parameter, and the scale generation amount generated on the surface of the metal material is controlled on the basis of the flow rate of the hydrogen-based gas thus set. At least one item selected from a heating time and a heating temperature of the metal material in the heating furnace is also preferably set as a heating furnace operating parameter.
F27D 7/06 - Forming or maintaining special atmospheres or vacuum within heating chambers
C21D 1/00 - General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
F27B 9/04 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
F27D 7/02 - Supplying steam, vapour, gases or liquids
GAS INJECTION DEVICE, FACILITY FOR MANUFACTURING HOT-DIP PLATED METAL STRIP, METHOD FOR MANUFACTURING HOT-DIP PLATED METAL STRIP, AND METHOD FOR CLEANING GAS INJECTION DEVICE
Provided is a gas injection device capable of suppressing the occurrence of chipping even in a case where a non-metal material such as a ceramic is used as the material of a gas wiping nozzle. The gas injection device blows a wiping gas onto a metal strip. The gas injection device has a gas wiping nozzle which is formed of a material having heat resistance to molten metal and which has a gas injection port through which the wiping gas is injected. An edge surface of the gas injection port in which the injection port is formed is a curved surface or is formed such that there is an obtuse angle between the edge surface and a surface adjacent to the edge surface. According to the gas injection device of the present invention, the gas-injection port edge surface in which the injection port is formed is a curved surface or is formed such that there is an obtuse angle between the edge surface and the surface adjacent to the edge surface, and therefore the load received from a cleaning tool or the like can be dispersed, thus enabling chipping of the wiping nozzle to be suppressed.
GAS INJECTION DEVICE, FACILITY FOR MANUFACTURING HOT-DIP PLATED METAL STRIP, METHOD FOR MANUFACTURING HOT-DIP PLATED METAL STRIP, AND METHOD FOR CLEANING GAS INJECTION DEVICE
Provided is a gas injection device capable of suppressing the occurrence of chipping and preventing surface defects on a metal strip that accompany the generation of splashing, even in a case where a non-metal material such as a ceramic is used as the material of a gas wiping nozzle. The gas injection device blows a wiping gas onto a metal strip. The gas injection device has a gas wiping nozzle which is formed of a material having heat resistance to molten metal and which has a gas injection port through which the wiping gas is injected. An edge surface of the gas injection port is a curved surface or is formed such that there is an obtuse angle between the edge surface and a surface adjacent to the edge surface. The edge surface of the injection port is subjected to C surface chamfering of C0.10 or more and less than C1.10, or the edge surface of the injection port is subjected to R chamfering of R0.05 or more and R0.50 or less.
METHOD FOR MANUFACTURING TEST MATERIAL, METHOD FOR MEASURING DIFFUSIBLE HYDROGEN CONTENT, METHOD FOR EVALUATING DELAYED FRACTURE CHARACTERISTIC, METHOD FOR SELECTING METAL MATERIAL, AND METHOD FOR MANUFACTURING MEMBER
Provided is a method for manufacturing a test material with which it is possible for the diffusible hydrogen content of a metal material having a welded portion to be measured accurately. The method for manufacturing a test material for measuring the diffusible hydrogen content of a metal material including a welded portion includes: a blow hole position identification step for identifying a blow hole position in a test material, which is a metal material having a welded portion; and a machining step for machining the blow hole identified in the blow hole position identification step so as not to have a closed structure, or for removing the blow hole.
Provided is a coke oven repairing method for repairing bricks of one combustion chamber or bricks of a plurality of continuous combustion chambers forming a coke oven by relaying two or more furnace wall bricks and binder bricks at high temperatures along the furnace length direction from a furnace opening, the coke oven repairing method comprising: a confirmation step for observing, from the furnace opening using a three-dimensional measuring instrument, irregularities of furnace walls of an adjacent non-relaying combustion chamber located adjacent to one side surface of one relaying combustion chamber or a plurality of continuous relaying combustion chambers and irregularities of furnace walls of an adjacent non-relaying combustion chamber located adjacent to a side surface opposite to the one side surface, and thus confirming whether or not the protrusion amount is less than a predetermined value for each of the furnace walls of the adjacent non-relaying combustion chambers; and a relaying step for dismantling, if the protrusion amount of any of the furnace walls of the non-relaying combustion chambers is confirmed to be less than the predetermined value in the confirmation step, a repair-needed site of the furnace walls of the one relaying combustion chamber or the plurality of continuous relaying combustion chambers, and newly laying furnace wall bricks and binder bricks in the dismantled range.
Provided are a method for manufacturing a carbonaceous material-containing agglomerate ore and a method for manufacturing molten pig iron, with which a highly-reducible raw material can be obtained, and the amount of a reducing material used when manufacturing molten pig iron in a countercurrent moving bed can be reduced. The method of the present invention for manufacturing a carbonaceous material-containing agglomerate ore includes: a step of collecting carbon by bringing a carbon-containing gas that contains carbon monoxide into contact with a porous material; and an agglomeration step of performing agglomeration by mixing a carbon-containing raw material that contains the carbon collected into an ironcontaining raw material.
An electrical steel strip friction stir welding method is provided that is able to inhibit the occurrence of coil joint fracture on a production line caused by deterioration of mechanical properties and shape of the coil joint. Diameter D (mm) of shoulders of rotating tools satisfies the relationship of the following Expression (1), and rotation speed RS (r/min) of the rotating tools, the diameter D (mm), and joining speed JS (mm/min), expressed as RS×D3/JS, satisfy the relationship of the following Expression (2).
An electrical steel strip friction stir welding method is provided that is able to inhibit the occurrence of coil joint fracture on a production line caused by deterioration of mechanical properties and shape of the coil joint. Diameter D (mm) of shoulders of rotating tools satisfies the relationship of the following Expression (1), and rotation speed RS (r/min) of the rotating tools, the diameter D (mm), and joining speed JS (mm/min), expressed as RS×D3/JS, satisfy the relationship of the following Expression (2).
4
×
TJ
≤
D
≤
10
×
TJ
(
1
)
200
×
TJ
≤
RS
×
D
3
/
JS
≤
2
000
×
TJ
(
2
)
B23K 20/12 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by frictionFriction welding
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
H01F 41/00 - 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
