Hot-rolled steel sheet and method for producing same

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United States of America Patent

PATENT NO 9631265
SERIAL NO

14119124

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Abstract

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A hot-rolled steel sheet satisfies that average pole density of orientation group of {100}<011> to {223}<110> is 1.0 to 5.0 and pole density of crystal orientation {332}<113> is 1.0 to 4.0. Moreover, the hot-rolled steel sheet includes, as a metallographic structure, by area %, ferrite and bainite of 30% to 99% in total and martensite of 1% to 70%. Moreover, the hot-rolled steel sheet satisfies following Expressions 1 and 2 when area fraction of the martensite is defined as fM in unit of area %, average size of the martensite is defined as dia in unit of μm, average distance between the martensite is defined as dis in unit of μm, and tensile strength of the steel sheet is defined as TS in unit of MPa.

description='In-line Formulae' end='lead'dia≦13 μm  (Expression 1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'TS/fM×dis/dia≧500  (Expression 2)description='In-line Formulae' end='tail'

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Patent Owner(s)

  • NIPPON STEEL CORPORATION;NIPPON STEEL & SUMITOMO METAL CORPORATION;SUMITOMO METAL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujita, Nobuhiro Tokyo, JP 59 622
Hayashi, Kunio Tokyo, JP 71 450
Nakano, Kazuaki Tokyo, JP 20 122
Okamoto, Riki Tokyo, JP 59 311
Sano, Kohichi Tokyo, JP 37 307

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