Steel sheet for hot stamping member and method of producing same
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsHiroyuki Tanahashi, Jun Maki
Life of this patent
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Abstract
A steel sheet for a hot stamping member contains, as a chemical composition, 0.10 mass % to 0.35 mass % of C; 0.01 mass % to 1.0 mass % of Si; 0.3 mass % to 2.3 mass % of Mn; 0.01 mass % to 0.5 mass % of Al; limited to 0.03 mass % or less of P; limited to 0.02 mass % or less of S; limited to 0.1 mass % or less of N; and a balance consisting of Fe and unavoidable impurities, in which a standard deviation of diameters of iron carbides which are contained in a region from a surface to a ¼ thickness position of the steel sheet is less than or equal to 0.8 μm.
Claims18
A steel sheet for producing a hot stamping member, the steel sheet comprising, as a chemical composition:
- 0.10 mass % to 0.35 mass % of C;
- 0.01 mass % to 1.0 mass % of Si;
- 0.3 mass % to 2.3 mass % of Mn;
- 0.01 mass % to 0.5 mass % of Al;
- limited to 0.03 mass % or less of P;
- limited to 0.02 mass % or less of S;
- limited to 0.1 mass % or less of N;
- and
- a balance of Fe and unavoidable impurities,
- wherein a standard deviation of diameters of iron carbides which are contained in a region from a surface to a ¼ thickness position of the steel sheet is less than or equal to 0.8 μm and an average value of a size of the iron carbides which are contained in the region from the surface to the ¼ thickness position of the steel sheet is 1.0 μm or more and 2.0 μm or less.
Dependencies are inferred from the claim text.