Abstract: A weld structure includes a first stainless steel member and a second stainless steel member. A crevice made by welding is defined by welding an end of the first stainless steel member and a portion other than an end of the second stainless steel member. A portion close to the end of the first stainless steel member is formed as a weld metal portion by performing welding heat input on the portion close to the end of the first stainless steel member. In the crevice made by welding, a length LB from a boundary between the weld metal portion and a raw material portion to a crevice deepest portion and a crevice length LC from the crevice deepest portion to a 40 ?m-width position satisfy LC<LB.

Abstract: A ferritic stainless steel sheet for an automobile brake disc rotor includes: 0.001 to 0.05 mass % of C; 0.001 to 0.05 mass % of N; 0.3 to 4.0 mass % of Si; 0.01 to 2.0 mass % of Mn; 0.01 to 0.05 mass % of P; 0.0001 to 0.02 mass % of S; 10 to 20 mass % of Cr; one or both of 0.001 to 0.5 mass % of Ti and 0.01 to 0.8 mass % of Nb; and a balance consisting of Fe and impurities. After a hot stamping treatment, a crystal grain size is in a range from 100 to 200 ?m, and precipitates each having a grain size of 500 nm or less are present at a density of 0.01 to 20 pieces per square micrometer.

Abstract: This clear-coated stainless steel sheet (10) includes a stainless steel sheet (20), and a clear-coated film (30) formed on at least one surface (20a) of the stainless steel sheet (20) and having an average film thickness of 0.05 ?m or more and 3.00 ?m or less.

Abstract: A ferritic stainless steel and a heat exchanger using the ferritic stainless steel are provided. The ferritic stainless steel includes, in mass %, C: 0.030% or less, N: 0.020% or less, Si: 0.5% or less, Mn: 1.0% or less, P: 0.05% or less, S: 0.01% or less, Cr: 16% to 25%, Nb: 0.05% to 1.0%, Al: 0.003% to 0.20%, and a balance comprising Fe and unavoidable impurities. The Al oxide is present on the surface of the material, the surface coverage ratio by the Al oxide is 5% to 70%, the surface roughness in Ra measured by red laser is 0.010-0.15 ?m, and the thickness from the surface to the point, which includes the value of a half peak of the Al content on the surface, satisfies 300 nm or less, the value of a half peak of the Al content in an elemental profile expressed by a cation ratio.

Abstract: One aspect of this ferritic stainless steel sheet contains, by mass %, C: 0.03% or less, N: 0.05% or less, Si: 1% or less, Mn: 1.2% or less, Cr: 14% or more and 28% or less, Nb: 8(C +N) or more and 0.8% or less, and Al: 0.1% or less, with a balance being Fe and inevitable impurities, in which a film satisfying Expression 1 is formed in a surface thereof. Expression 1 is df×Crf+5(Sif+3Alf)?2.0. In Expression 1, df represents a thickness (nm) of the film, Crf represents a Cr cationic fraction in the film, Sif represents a Si cationic fraction in the film, and Alf represents an Al cationic fraction in the film.

Abstract: A ferritic stainless steel, which has excellent heat exchange properties, corrosion resistance and brazing property of the heat exchanger component, and a heat exchanger using the ferritic stainless steel are provided. The ferritic stainless steel includes, in a mass %, C: 0.030% or less, N: 0.020% or less, Si: 0.5% or less, Mn: 1.0% or less, P: 0.05% or less, 5: 0.01% or less, Cr: 16% to 25%, Nb: 0.05% to 1.0%, Al: 0.003% to 0.20%, and a balance composed of Fe and unavoidable impurities. The Al oxide is present on the surface of the material, the surface coverage ratio by the Al oxide is 5% to 70%, the surface roughness in Ra measured by red laser is 0.010 ?m to 0.15 ?m, and the thickness from the surface to the point, which includes the value of a half peak of the Al content on the surface, satisfies 300 nm or less, the value of a half peak of the Al content being obtained from an elemental profile expressed by a cation ratio.

Abstract: One aspect of this ferritic stainless steel sheet contains, by mass %, C: 0.03% or less, N: 0.05% or less, Si: 1% or less, Mn: 1.2% or less, Cr: 14% or more and 28% or less, Nb: 8(C+N) or more and 0.8% or less, and Al: 0.1% or less, with a balance being Fe and inevitable impurities, in which a film satisfying Expression 1 is formed in a surface thereof. df×Crf+5(Sif+3Alf)?2.0??(Expression 1) In Expression 1, df represents a thickness (nm) of the film, Crf represents a Cr cationic fraction in the film, Sif represents a Si cationic fraction in the film, and Alf represents an Al cationic fraction in the film.

Abstract: This ferrite stainless steel includes: by mass %, C: 0.020% or less; N: 0.025% or less; Si: 1.0% or less; Mn: 0.5% or less; P: 0.035% or less; S: 0.01% or less; Cr: 16% to 25%; Al: 0.15% or less; Ti: 0.05% to 0.5%; and Ca: 0.0015% or less, with the balance being Fe and inevitable impurities, wherein the following formula (1) is fulfilled, BI=3Al+Ti+0.5Si+200Ca?0.8??(1) (wherein Al, Ti, Si, and Ca in the formula (1) represent contents (mass %) of the respective components in the steel).

Abstract: Ferritic stainless steel excellent in corrosion resistance of the weld zone, in particular the corrosion resistance to crevice corrosion, even if eliminating the Ar gas shield at the time of TIG welding and, furthermore, excellent in weld zone strength and a structure of the same are provided. By making the ingredient system one satisfying the following formula (1) in ferritic stainless steel which has predetermined contents of ingredients by mass % under a usual corrosive environment, it is possible to raise the corrosion resistance. Furthermore, under a severely corrosive environment, by making the relationship between the back surface exposed width of the weld bead and the steel sheet thickness satisfy the formula (2) in addition to the relationship of the ingredients prescribed in formula (1), it is possible to obtain a welded structure strong in crevice corrosion.

Abstract: The present invention provides austenitic stainless steel which is not only excellent in brazeability, but is also excellent in corrosion resistance in an environment where condensation of combustion exhaust gas causes formation of condensed water which contains nitric acid ions or sulfuric acid ions and which is low in pH or in an environment of an aqueous solution which contains chloride ions, which contains, by mass %, C: 0.080% or less, Si: 1.2 to 3.0%, Mn: 0.4 to 2.0%, P: 0.03% or less, S: 0.003% or less, Ni: 6.0 to 12.0%, Cr: 16.0 to 20.0%, Cu: 0.2 to 3.0%, Al: 0.002 to 0.10%, N: 0.030 to 0.150%, and Mo: 0.1 to 1.0%, has a balance of Fe and unavoidable impurities, and satisfies Formula (A): 1.6?[Cu]×[Si?]4.4 and Formula (B): 0.16?2[N]+[Mo?]1.0.

Abstract: A ferritic stainless steel that generates only a small amount of black spots in weld zone, the steel containing, in mass %, 0.020% or less of C, 0.025% or less of N, 1.0% or less of Si, 1.0% or less of Mn, 0.035% or less of P, 0.01% or less of S, 16.0 to 25.0% of Cr, 0.12% or less of Al, 0.05 to 0.35% of Ti, and 0.0015% or less of Ca, and the balance consisting of Fe and unavoidable impurities, wherein the following formula 1 is satisfied. BI=3Al+Ti+0.5Si+200Ca?0.8??(1) where Al, Ti, Si, and Ca in the formula 1 each denotes an amount of each element in mass % of the steel.

Abstract: The present invention provides a ferritic stainless steel exhibiting excellent corrosion resistance in a condensed water environment arising from a hydrocarbon combustion exhaust gas typified by the use environment of a structural member of a secondary heat exchanger, which stainless steel is a ferritic stainless steel comprising, in mass %, C: 0.030% or less, N: 0.030% or less, Si: 0.4% or less, Mn: 0.01 to 0.5%, P: 0.05% or less, S: 0.01% or less, Cr: 16 to 24%, Mo: 0.30 to 3%, Ti: 0.05 to 0.25%, Nb: 0.05 to 0.50%, Al: 0.01 to 0.2%, and Cu: 0.4% or less, the balance being Fe and unavoidable impurities, and satisfying Expression (A): Cr+Mo+10Ti?18 and Expression (B): Si+Cu?0.5.

Abstract: This ferrite stainless steel includes: by mass %, C: 0.020% or less; N: 0.025% or less; Si: 1.0% or less; Mn: 0.5% or less; P: 0.035% or less; S: 0.01% or less; Cr: 16% to 25%; Al: 0.15% or less; Ti: 0.05% to 0.5%; and Ca: 0.0015% or less, with the balance being Fe and inevitable impurities, wherein the following formula (1) is fulfilled, BI=3Al+Ti+0.5Si+200Ca?0.8??(1) (wherein Al, Ti, Si, and Ca in the formula (1) represent contents (mass %) of the respective components in the steel).