High-strength hot-rolled steel sheet having excellent local deformability and manufacturing method thereof

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United States of America Patent

PATENT NO 9988697
APP PUB NO 20140124101A1
SERIAL NO

14110896

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Abstract

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This high-strength hot-rolled steel sheet having excellent local deformability contains, in mass %, C: 0.07% to 0.20%; Si: 0.001% to 2.5%; Mn: 0.01% to 4.0%; P: 0.001% to 0.15%; S: 0.0005% to 0.03%; Al: 0.001% to 2.0%; N: 0.0005% to 0.01%; and O: 0.0005% to 0.01%; and a balance being composed of iron and inevitable impurities, in which an area ratio of bainite in a metal structure is 95% or more, at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100}<011> to {223}<110> orientation group is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 5.0 or less, and a mean volume diameter of crystal grains in the metal structure is 10 μm or less.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujita, Nobuhiro Tokyo, JP 59 688
Hayashi, Kunio Tokyo, JP 72 521
Nakano, Kazuaki Tokyo, JP 20 139
Okamoto, Riki Tokyo, JP 59 364
Sano, Kohichi Tokyo, JP 37 358
Suwa, Yoshihiro Tokyo, JP 15 62

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