Steel sheet
AssigneeNippon Steel Corporation
InventorsYasuaki TANAKA, Hitoshi NIKAIDO, Hiroyuki KAWATA, Natsuko SUGIURA
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Abstract
There is provided a steel sheet including a chemical composition consisting of, in mass %: C: 0.03 to 0.25%, Si: 0.1 to 2.0%, Mn: 1.0 to 3.0%, P: 0.200% or less, S: 0.0500% or less, Al: 0.01 to 1.00%, N: 0.0100% or less, and Ti: 0.01 to 0.25%, with the balance: Fe and impurities, and a steel micro-structure containing, in area %: ferrite: 50 to 85%, the balance being one or more kinds selected from martensite, bainite, and retained austenite, and an intensity of γ-fiber is more than 4.0 times in terms of random intensity ratio, and an average KAM value of grains having crystal orientations that form angles within 10° from γ-fiber is 1.30° or less.
Claims8
A steel sheet having
- a chemical composition consisting of, in mass %:
- C:
- 0.03 to 0.25%,
- Si:
- 0.1 to 2.0%,
- Mn:
- 1.0 to 3.0%,
- P:
- 0.200% or less,
- S:
- 0.0500% or less,
- Al:
- 0.01 to 1.00%,
- N:
- 0.0100% or less,
- Ti:
- 0.01 to 0.25%,
- Cr:
- 0 to 0.50%,
- Ni:
- 0 to 0.50%,
- Cu:
- 0 to 0.50%,
- Nb:
- 0 to 0.050%,
- V:
- 0 to 0.15%,
- Zr:
- 0 to 0.15%,
- Mo:
- 0 to 0.15%,
- W:
- 0 to 0.15%,
- one or more elements selected from Sn, Sb, and Te:
- 0 to 0.100% in total,
- one or more elements selected from Ca, Mg, and REM:
- 0 to 0.0050% in total,
- B:
- 0 to 0.0050%,
- with the balance:
- Fe and impurities, and
- a steel micro-structure containing, in area %:
- ferrite:
- 50 to 85%,
- with the balance being one or more kinds selected from martensite, bainite, and retained austenite, wherein
- an intensity of γ-fiber is more than 4.0 times in terms of random intensity ratio, and an average KAM value of grains having crystal orientations that form angles within 10° from γ-fiber is 1.30° or less.
A steel sheet comprising a chemical composition comprising, in mass %:
- C:
- 0.03 to 0.25%,
- Si:
- 0.1 to 2.0%,
- Mn:
- 1.0 to 3.0%,
- P:
- 0.200% or less,
- S:
- 0.0500% or less,
- Al:
- 0.01 to 1.00%,
- N:
- 0.0100% or less,
- Ti:
- 0.01 to 0.25%,
- Cr:
- 0 to 0.50%,
- Ni:
- 0 to 0.50%,
- Cu:
- 0 to 0.50%,
- Nb:
- 0 to 0.050%,
- V:
- 0 to 0.15%,
- Zr:
- 0 to 0.15%,
- Mo:
- 0 to 0.15%,
- W:
- 0 to 0.15%,
- one or more elements selected from Sn, Sb, and Te:
- 0 to 0.100% in total,
- one or more elements selected from Ca, Mg, and REM:
- 0 to 0.0050% in total,
- B:
- 0 to 0.0050%,
- with the balance:
- Fe and impurities, and
- a steel micro-structure containing, in area %:
- ferrite:
- 50 to 85%,
- with the balance being one or more selected from martensite, bainite, and retained austenite, wherein
- an intensity of γ-fiber is more than 4.0 times in terms of random intensity ratio, and an average KAM value of grains having crystal orientations that form angles within 10° from γ-fiber is 1.30° or less.
Dependencies are inferred from the claim text.