Steel sheet and production method for same

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12252758
APP PUB NO 20220154302A1
SERIAL NO

17437369

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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This steel sheet has a predetermined chemical composition, a microstructure contains, in terms of a volume fraction, ferrite: 10% to 75%, martensite: 20% to 90%, retained austenite: 0% to 5%, bainite and bainitic ferrite in total: 0% to 50%, and pearlite: 0% to 5%, a proportion of unrecrystallized ferrite in the ferrite is 0% to 25%, cementite that is contained in the martensite satisfies a predetermined relational expression, a density of transition carbide included in the martensite is 1.0×1013 pieces/m3 or more, a density of coarse inclusion having an equivalent circle diameter of 10 μm or more is 0.50 pieces/mm2 or less, in a surface parallel to the surface at a position ¼ of the sheet thickness deep from the surface in the sheet thickness direction, a ratio of a maximum value Hvmax of Vickers hardness to a minimum value Hvmin of the Vickers hardness is 1.40 or less, and an average value of minimum distances between peaks of the Vickers hardness in a distribution map of the Vickers hardness is 1.00 mm or less.

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Patent Owner(s)

  • 501 NIPPON STEEL CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawata, Hiroyuki Tokyo, JP 104 1026

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