High-strength cold-rolled steel sheet and production method for same

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12241137
APP PUB NO 20220064752A1
SERIAL NO

17420216

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A high-strength cold rolled steel sheet has a specific composition and a steel structure that is, by volume %, 10%-70% ferrite, 1%-10% retained austenite, 10%-60% bainite, and 2%-50% martensite, the average crystal grain size of the ferrite being no more than 6.0 μm, the average crystal grain size of the retained austenite being no more than 4.0 μm, the average crystal grain size of the bainite being no more than 6.0 μm, and the average crystal grain size of the martensite being no more than 4.0 μm. The concentration ratio of the average concentration of Si to a depth of 10 μm from the surface of the high-strength cold-rolled steel sheet to the average concentration of Si throughout the high-strength cold-rolled steel sheet is, by mass ratio, greater than 1.00 but less than 1.30.

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Patent Owner(s)

  • JFE STEEL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Obata, Yoshie Tokyo, JP 13 37
Takashima, Katsutoshi Tokyo, JP 73 236
Yokota, Takeshi Tokyo, JP 110 1019

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