Hot-pressed member, cold-rolled steel sheet for hot pressing, and manufacturing methods therefor

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12215405
APP PUB NO 20220186339A1
SERIAL NO

17432218

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Provided is a hot-pressed member that combines both high strength of 1850 MPa or more in TS and excellent delayed fracture resistance. A hot-pressed member comprises: a predetermined chemical composition; a microstructure in which a prior austenite average grain size is 8 μm or less, a volume fraction of martensite is 95% or more, and a volume fraction of granular carbide of 0.1 μm or more in grain size is 0.10% to 4.0%; a Ni diffusion region of 2.0 μm or more in a depth direction in a surface layer; and a tensile strength of 1850 MPa or more.

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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
Sakurai, Michitaka Tokyo, JP 20 89
Takashima, Katsutoshi Tokyo, JP 73 236
Tanaka, Minoru Tokyo, JP 228 3271

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