Abstract: A TIG welding filler metal is provided that has a composition including, by mass %, C: 0.20 to 0.80%, Si: 0.15 to 0.90%, Mn: 15.0 to 30.0%, P: 0.030% or less, S: 0.030% or less, Cr: 6.0 to 15.0%, and N: 0.120% or less, the balance being Fe and incidental impurities. Where necessary, the filler metal may contain one or two selected from Ni and Mo, may further contain one, or two or more selected from V, Ti, and Nb, and may additionally contain one, or two or more selected from Cu, Al, Ca, and REM. This configuration reduces the occurrence of welding cracks during TIG welding, that is, realizes excellent hot crack resistance, and allows for easy production of a weld joint having high strength and excellent cryogenic impact toughness.

Abstract: A molten iron refining method having, an auxiliary material, and an oxidizing gas supplied through a top-blowing lance, to a cold iron source and molten pig iron that are contained/fed in a converter-type vessel, and molten iron is subjected to a refining process. A pre-charged cold iron source is charged into the converter-type vessel at an amount not larger than 0.15 times. A furnace-top-added cold iron source that's part or all of the cold iron source and added from a furnace top is fed during the refining process. A burner at a leading end of the top-blowing lance that spray holes through which a fuel and a combustion-supporting gas are ejected. During the refining process, a powdery auxiliary material processed into powder that's part of the auxiliary material is blown in, to pass through a flame formed by the burner.

Abstract: A hot-pressed member is disclosed including at least one surface that has a filtered centerline waviness Wca of less than or equal to 1.5 ?m.

Abstract: Proposed is a method for efficiently desulfurizing molten metal in a short time without passing an excessive current when applying a potential difference between slag and metal. Using a direct-current power source, this method for desulfurizing molten metal applies a potential difference between molten slag and molten metal through electrodes, of which one electrode contacting the molten metal serves as a negative electrode and the other electrode contacting only the molten slag serves as a positive electrode. An applied current density Ja is determined according to an equilibrated S concentration [S]e0 before application of a potential difference such that an equilibrated S concentration [S]ea when a potential difference is applied becomes equal to or lower than a target S concentration [S]ft.

Abstract: Disclosed is a method for producing an annealed and pickled steel sheet in a continuous manner by continuously performing: subjecting a cold-rolled steel sheet to annealing to obtain an annealed steel sheet; subjecting the annealed steel sheet to pickling with a mixed acid solution containing a first acid that is oxidizing and a second acid that is non-oxidizing, by feeding the annealed steel sheet into a mixed acid tank holding the mixed acid solution; and subjecting the annealed steel sheet discharged from the mixed acid tank to repickling with an acid solution containing a third acid that is non-oxidizing. Fe concentration in the mixed acid solution in the mixed acid tank is measured, and a lower limit of ferrite fraction in a surface layer of the annealed steel sheet to be subjected to the pickling is set according to the Fe concentration measured.

Abstract: Disclosed is a grain-oriented electrical steel sheet with extremely low iron loss by means of a magnetic domain refining technique. In a grain-oriented electrical steel sheet having a plurality of magnetic domains refined via a local strain introduction portion, when a direct-current external magnetic field is applied to the steel sheet in a rolling direction, for a magnetic flux leaked from the local strain introduction portion at a position 1.0 mm away from a surface of the steel sheet at a side of the local strain introduction portion, a value obtained by dividing an intensity level of a total leakage magnetic flux by an intensity level of a magnetic flux leaked due to causes other than strain is more than 1.2.

Abstract: An insulating coating-attached electrical steel sheet has, on at least one surface, an insulating coating including an insulating tensile coating layer A. A tension applied to the steel sheet by an insulating tensile coating layer having a coating weight of M/2 from a surface of the insulating tensile coating layer A is 0.80×?A or more, where M is a weight of the insulating tensile coating layer A, and ?A is the tension applied to the steel sheet by the insulating tensile coating layer A. The insulating coating-attached electrical steel sheet has excellent adhesion of the insulating coating. A method for manufacturing the insulating coating-attached electrical steel sheet is also provided.

Abstract: It is provided a surface-treated steel sheet that can be produced without using hexavalent chromium and has excellent sulfide staining resistance and coating secondary adhesion. It is a surface-treated steel sheet having: a Sn plating layer; a metallic Cr layer disposed on the Sn plating layer; and a Cr oxide layer disposed on the metallic Cr layer, on at least one surface of a steel sheet, and the surface-treated steel sheet has a water contact angle of 50° or less and a total atomic ratio of K, Na, Mg, and Ca adsorbed on the surface to Cr of 5% or less.

Abstract: Provided are a steel sheet having high strength and high delayed fracture resistance and a method for manufacturing the steel sheet. The steel sheet has a specific chemical composition and a microstructure in which the area fraction of martensite is 95% to 100%, with the balance being one or more of bainite, ferrite, and retained austenite. In the steel sheet, prior-austenite grains have an average grain size of 18 ?m or less, 90 mass % or more of the total content of Nb and Ti contained is present as a carbonitride having an equivalent circular diameter of 100 nm or more, and a Nb carbonitride and a Ti carbonitride, having an equivalent circular diameter of 1.0 ?m or more, are present at a rate of 800 pieces/mm2 or less in total. The steel sheet has a tensile strength of 1310 MPa or more.

Abstract: A press forming method for suppressing wall camber of a side wall portion due to springback of a press-formed product including a top portion, the side wall portion and a flange portion includes: a first forming step of press-forming a preformed part including a flange portion having height continuously changed in an axial direction to have a concave shape, a convex shape or a concavo-convex shape more largely than a target shape of the press-formed product in a height direction to provide a height difference; and a second forming step of press-forming the preformed part into the press-formed product having the target shape to reduce the height difference of the flange portion of the preformed part.

Abstract: Proposed is a molten iron refining method capable of securing an in-flame staying time period of a heat transfer medium without being influenced by height adjustments of a blowing-purpose oxygen-blowing lance. As far as to a position lower than an upper end inside a converter-type vessel 1, a blowing-purpose oxygen-blowing lance 3 that supplies oxidizing gas and is capable of ascending and descending and at least one burner lance 4 capable of ascending and descending independently of the blowing-purpose oxygen-blowing lance are inserted. From the blowing-purpose oxygen-blowing lance, either oxidizing gas or oxidizing gas and CaO-containing refining agent are blown onto the molten iron. Also, a flame is formed by causing the burner lance to discharge fuel gas and combustion supporting gas. Powder particles discharged from the burner lance are caused to pass through the flame and to be blown onto the molten iron in a heat-transferred state, so that the molten iron is thermally compensated.

Abstract: Disclosed is a component for solid oxide fuel cells that is excellent in both electrical conductivity and chromium poisoning resistance. As a substrate, a ferritic stainless steel having a chemical composition containing, in mass %, Cr: 14.0% to 32.0% and Al: 2.50% to 7.00% is used. Precious metal particles are coated on a surface of the substrate. The precious metal particles have: an average particle size of 1 ?m or more and 10 ?m or less; a coating thickness of 0.5 ?m or more and 10 ?m or less; and a surface coverage of 1.0% or more.

Abstract: A converter steelmaking method has molten pig iron subjected to dephosphorization process for dephosphorized molten iron, dephosphorized molten iron is subjected to decarburization process for molten steel. For dephosphorization process, a first cold iron source in amount meeting Formula (1) is charged into first converter-type vessel, then undephosphorized molten pig iron is charged and subjected to dephosphorization process. Dephosphorized molten iron is discharged and held in molten metal receiving vessel. After second cold iron source is charged into first converter-type vessel in which dephosphorization process has been performed, the dephosphorized molten iron held in molten metal receiving vessel is charged and subjected to decarburization process. % Ws0?0.1186T?134 (% Ws0?0) . . . (1), where % Ws0: a ratio (%) of first cold iron source to sum of first cold iron source and charge amount of undephosphorized molten pig iron, and T: a temperature (° C.) of undephosphorized molten pig iron.

Abstract: Provided is a high-strength steel sheet having excellent ductility, bendability, and TS of 500 MPa or more, in particular, a high-strength thin steel sheet for cans having a sheet thickness of 0.1 to 0.8 mm, the steel sheet having a chemical composition containing C: 0.03-0.15%, Si: 0.01-0.05%, Mn: more than 0.6% and 1.5% or less, P: 0.025% or less, S: 0.02% or less, Al: 0.01-0.10%, N: 0.0005-0.0100%, Ti: 0.005-0.020%, B: 0.0005-0.0100%, and Nb: 0.0050-0.0200% with the balance being Fe and inevitable impurities, in which the steel sheet has a metallic structure containing, in area ratio, 85% or more of ferrite and 1-10% of martensite, the martensite has a grain size of 5 ?m or less, and a ratio of martensite having a grain size of 2 ?m or less is 80% or more.

Abstract: A resistance spot welding method comprises: performing test welding; and performing actual welding after the test welding, wherein the test welding is performed under each of two or more welding conditions. In the test welding, for each of the welding conditions, an electrode force parameter from when electrode force application to parts to be welded starts to when a set electrode force is reached before start of current passage and a time variation curve of an instantaneous amount of heat generated and a cumulative amount of heat generated are stored.

Abstract: A method of producing a coal mixture includes blending a plurality of coals, wherein formula (1) and formula (2) are satisfied: ? calc = ? i N ? ? i × x i ( 1 ) ?calc?1.2×10?10 (mol/g-coal)??(2) wherein ?calc is a hydrogen ion release capacity per unit mass (mol/g-coal) of the coal mixture, ?i is the hydrogen ion release capacity per unit mass (mol/g-coal) of a coal i, xi is a blending ratio of the coal i blended in the coal mixture, and N is a total number of brands of coal contained in the coal mixture.

Abstract: A method for identifying a variation factor portion of a springback amount, including: performing press forming analysis under first press forming conditions, and calculating a residual stress distribution in a press formed part; performing springback analysis on the press formed part, and calculating a first springback amount; performing press forming analysis under second press forming conditions, and calculating a residual stress distribution in the press formed part; replacing a value of residual stress in a partial area of the residual stress distribution; performing springback analysis on the press formed part for which the value of the residual stress has been replaced, and calculating a second springback amount; obtaining a difference between the second springback amount and the first springback amount; and identifying a portion in the press formed part that is a factor for variation in springback amount of the press formed part based on the obtained difference.

Abstract: Provided is a chromium-containing steel sheet for a current collector of a nonaqueous electrolyte secondary battery. The chromium-containing steel sheet for a current collector of a nonaqueous electrolyte secondary battery has a chemical composition containing Cr in an amount of 10% by mass or more. A parameter Sa defined in ISO 25178 is from 0.15 ?m to 0.50 ?m inclusive, and a parameter Ssk defined in ISO 25178 is more than 0.

Abstract: A molten iron refining method that prevents a cold iron source from remaining unmelted even under the condition of a high ratio of the cold iron source. An auxiliary material is added, and an oxidizing gas is supplied, to cold iron source and molten pig iron that are contained or fed in converter-type vessel, and molten iron is subjected to refining process. Prior to refining process, a pre-charged cold iron source that is charged all at once into the converter-type vessel before the molten pig iron is charged into the converter-type vessel is charged in an amount not larger than 0.15 times the sum of an amount of the pre-charged cold iron source and a charge amount of the molten pig iron, or is not charged. A furnace-top-added cold iron source that is added from a furnace top of the converter-type vessel is fed into converter-type vessel during refining process.

Abstract: A resistance spot welding method comprises: performing test welding; and performing actual welding after the test welding, wherein in the test welding, 0.2?Vtp/Vtm?1.5 is satisfied where Vtm is an average value of a voltage between the electrodes in main current passage in the test welding and Vtp is an average value of a voltage between the electrodes in subsequent current passage in the test welding, and in each of main current passage and subsequent current passage in the actual welding, a time variation curve of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume that are stored in a corresponding one of the main current passage and the subsequent current passage in the test welding are set as a target, and adaptive control welding is performed to control a current passage amount according to the target.