Hot-rolled steel sheet and method for manufacturing the same

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United States of America Patent

PATENT NO 9903004
APP PUB NO 20150284818A1
SERIAL NO

14434835

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Abstract

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A hot-rolled steel sheet having a tensile strength of 900 MPa or more, the hot-rolled steel sheet consisting of, in mass %, C: greater than 0.050% and less than or equal to 0.10%, Si: greater than or equal to 0.1% and less than or equal to 2.0%, Mn: greater than or equal to 1.0% and less than or equal to 3.0%, P: less than or equal to 0.1%, S: less than or equal to 0.01%, Al: greater than or equal to 0.005% and less than or equal to 0.05%, N: less than or equal to 0.01%, Ti: greater than or equal to 0.10% and less than or equal to 0.20%, Nb: greater than or equal to 0% and less than or equal to 0.06%, B: greater than or equal to 0% and less than or equal to 0.03%, Ca: greater than or equal to 0% and less than or equal to 0.005%, and the balance: Fe and impurities. An average crystal grain size is less than or equal to 7.0 μm, and an X-ray random intensity ratio in {211} <011> orientation that is parallel to a rolled surface and a rolling direction is less than or equal to 2.5.

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Patent Owner(s)

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

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Imai, Takeshi Tokyo, JP 93 1188
Takahashi, Takehiro Tokyo, JP 133 694
Toyoda, Takeshi Tokyo, JP 33 196
Yamamoto, Takeshi Tokyo, JP 702 5468

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