High-strength steel sheet and method for producing the same

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12139771
APP PUB NO 20220081734A1
SERIAL NO

17425453

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Abstract

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A high-strength steel sheet that has a predetermined component composition, that has a steel microstructure in which an area percentage of ferrite ranges from 5% to 50% in a thickness cross-section in a rolling direction, a total area percentage of fresh martensite and retained γ ranges from 2% to 30%, each of the fresh martensite and the retained γ has an average grain size of 5 μm or less, and a ratio of the fresh martensite and the retained γ adjacent only to ferrite with respect to the fresh martensite and the retained γ from a surface to 200 μm in the thickness direction is 30% or less in total area percentage, and that has a yield strength of 550 MPa or more.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATIONTOKYO 100-0011

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nakagaito, Tatsuya Tokyo, JP 80 502
Takeda, Yuki Tokyo, JP 48 310
Yang, Lingling Tokyo, JP 26 203

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