Hot stamped article, method of producing hot stamped article, energy absorbing member, and method of producing energy absorbing member

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United States of America Patent

PATENT NO 10023925
APP PUB NO 20140037980A1
SERIAL NO

14112584

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A hot stamped article has a component composition containing, in terms of % by mass, 0.002% to 0.1% of C, 0.01% to 0.5% of Si, 0.5% to 2.5% of Mn+Cr, 0.1% or less of P, 0.01% or less of S, 0.05% or less of t-Al, 0.005% or less of N, and 0.0005% to 0.004% of B which is optionally contained in a case where the Mn+Cr is 1.0% or more, the remainder being Fe and unavoidable impurities. The hot stamped article has a microstructure composed of, in terms of an area ratio, 0% or more and less than 90% of martensite, 10% to 100% of bainite, and less than 0.5% of unavoidable inclusion structures, or a microstructure composed of, in terms of an area ratio, 99.5% to 100% of bainitic ferrite, and less than 0.5% of unavoidable inclusion structures.

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Patent Owner(s)

  • NIPPON STEEL & SUMITOMO METAL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawasaki, Kaoru Tokyo, JP 42 556

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