High-strength cold-rolled steel sheet and manufacturing method therefor

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United States of America Patent

PATENT NO 11473164
APP PUB NO 20210062288A1
SERIAL NO

16981160

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Abstract

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This high-strength cold-rolled steel sheet has a predetermined chemical composition, wherein a microstructure at a ¼ position of a sheet thickness from a surface includes predetermined ranges of volume percentages of tempered martensite, residual austenite, ferrite and bainite, and martensite, wherein a microstructure at a position 25 μm from the surface includes, predetermined ranges of volume percentage of ferrite and bainite, and martensite and tempered martensite, wherein in the position 25 μm from the surface, an average grain size of the martensite and the tempered martensite is 5.0 μm or less, a tensile strength is 1,310 MPa or more, and a uniform elongation is 5.0% or more, and R/t is 5.0 or less, the R/t being a ratio of a limit bend radius R in 90° V-bending to a sheet thickness t.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONCHIYODA-KU TOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akiba, Kojiro Tokyo, JP 8 7
Azuma, Masafumi Tokyo, JP 63 464
Kato, Satoshi Tokyo, JP 130 1118
Narita, Yoshimasa Tokyo, JP 3 14
Nishio, Takuya Tokyo, JP 31 234
Ohno, Kotaro Tokyo, JP 1 0

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