Heat-treated steel sheet member and method for producing the same

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United States of America Patent

PATENT NO 11041225
APP PUB NO 20180171429A1
SERIAL NO

15563989

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Abstract

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A heat-treated steel sheet member having a chemical including, by mass %: C: 0.05 to 0.50%; Si: 0.50 to 5.0%; Mn: 1.5 to 4.0%; P: 0.05% or less; S: 0.05% or less; N: 0.01% or less; Ti: 0.01 to 0.10%; B: 0.0005 to 0.010%; Cr: optional amounts of Ni, Cu, Mo, V, Ca, Al, Nb, and REM, with the balance: Fe and impurities. The steel sheet member has a microstructure comprising: mainly martensite; and retained austenite of which a volume ratio is 5.0% or higher, a number density of retained carbide in the steel sheet member having circle-equivalent diameters of 0.1 mm or larger is 4.0×103/mm2 or lower, [(log fg0−log fg(0.02))/0.02<20.0] is satisfied when mechanical properties are measured using a sheet specimen specified in ASTM E8, a tensile strength is 1.4 GPa or higher, and a total elongation is 8.0% or higher.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONCHIYODA-KU TOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Azuma, Masafumi Tokyo, JP 63 464
Hikida, Kazuo Tokyo, JP 48 111
Suwa, Yoshihiro Tokyo, JP 15 62
Tabata, Shinichiro Tokyo, JP 27 74

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