Method for producing a low alloy steel for oil country tubular goods having excellent sulfide stress cracking resistance

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United States of America Patent

PATENT NO 9909198
SERIAL NO

14431394

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Abstract

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The low alloy steel for oil country tubular goods according to the present invention has a chemical composition containing, by mass percent, C: 0.56 to 1.00%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: at most 0.025%, S: at most 0.010%, Al: 0.005 to 0.100%, Mo: 0.40 to 1.00%, V: 0.05 to 0.30%, and O: at most 0.010%, the balance being Fe and impurities, wherein the yield stress thereof is at least 862 MPa, and the half-value width of a [211] crystal surface obtained by X-ray diffraction is at most 0.50°.

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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
Arai, Yuji Amagasaki, JP 213 3514
Kawano, Kaori Neyagawa, JP 26 189
Kondo, Keiichi Wakayama, JP 33 85
Okamura, Kazuo Nishinomiya, JP 113 1423
Omura, Tomohiko Kishiwada, JP 45 341
Sakamoto, Akihiro Kisarazu, JP 34 327
Yamamoto, Kenji Hyogo, JP 666 5727

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