High-strength steel sheet and method for producing same

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United States of America Patent

PATENT NO 11136643
APP PUB NO 20190161822A1
SERIAL NO

16320864

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Abstract

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A high-strength steel sheet having a specified chemical composition and a method for producing the same. The steel sheet including a multi-phase structure including, by volume fraction, ferrite of 35% to 65%, residual austenite of 7% or less (including 0%), martensite of 20% to 60%, bainite of 20% or less (including 0%), the ferrite having an average crystal grain size of 8 μm or less and an average aspect ratio of 3.5 or less, the martensite having an average crystal grain size of 3 μm or less, and the bainite having an average crystal grain size of 3 μm or less when contained. A standard deviation of Vickers hardness of the steel sheet being 30 or less when measured at 200 μm intervals from a position of 100 μm from a surface to a central portion in a thickness direction of the sheet.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATION2-3 UCHISAIWAI-CHO 2-CHOME CHIYODA-KU 100-0011

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ikeda, Rinsei Tokyo, JP 51 219
Kobayashi, Takashi Tokyo, JP 692 7856
Matsuda, Hiroshi Tokyo, JP 474 5592
Takashima, Katsutoshi Tokyo, JP 73 236
Taniguchi, Koichi Tokyo, JP 102 573

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