发明名称 |
LOW-ALLOY STEEL FOR OIL WELL PIPES WHICH HAS EXCELLENT SULFIDE STRESS CRACKING RESISTANCE, AND METHOD FOR MANUFACTURING LOW-ALLOY STEEL FOR OIL WELL PIPES |
摘要 |
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°. |
申请公布号 |
EP2915896(A1) |
申请公布日期 |
2015.09.09 |
申请号 |
EP20120887472 |
申请日期 |
2012.11.05 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
OMURA, TOMOHIKO;ARAI, YUJI;KAWANO, KAORI;SAKAMOTO, AKIHIRO;OKAMURA, KAZUO;YAMAMOTO, KENJI;KONDO, KEIICHI |
分类号 |
C22C38/12;C21D1/18;C21D6/00;C21D8/00;C21D8/10;C21D9/08;C22C38/00;C22C38/02;C22C38/04;C22C38/06;C22C38/14;C22C38/22;C22C38/24;C22C38/26;C22C38/28;C22C38/32;F16L9/02 |
主分类号 |
C22C38/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|