Steel sheet, member, and method for producing them

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United States of America Patent

PATENT NO 12098439
APP PUB NO 20230127243A1
SERIAL NO

17915739

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Abstract

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A steel sheet having a tensile strength (TS) of 1180 MPa or more, high LME resistance, and good weld fatigue properties. The steel sheet has a specific chemical composition and a specific steel microstructure. Crystal grains containing an oxide of Si and/or Mn in a region within 4.9 μm in a thickness direction from a surface of the steel sheet have an average grain size in the range of 3 to 10 μm, the lowest Si concentration LSi and the lowest Mn concentration LMn in the region within 4.9 μm in the thickness direction from the surface of the steel sheet and a Si concentration TSi and a Mn concentration TMn at a quarter thickness position of the steel sheet satisfy a specified formula.

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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
Hoshino, Katsuya Tokyo, JP 32 28
Kawasaki, Yoshiyasu Tokyo, JP 77 447
Nakagaito, Tatsuya Tokyo, JP 80 502
Takeda, Yuki Tokyo, JP 48 310
Terashima, Shotaro Tokyo, JP 13 3
Yamamoto, Shunsuke Tokyo, JP 61 74
Yang, Lingling Tokyo, JP 26 203

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