发明申请
- 专利标题： OIL-WELL STEEL PIPE HAVING EXCELLENT SULFIDE STRESS CRACKING RESISTANCE
- 专利标题（中）： 具有优异的耐硫裂纹耐油性能的钢管
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申请号： US14239829申请日： 2012-08-17
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公开(公告)号： US20140205487A1公开(公告)日： 2014-07-24
- 发明人: Atsushi Soma , Tomohiko Omura , Yuji Arai , Misuhiro Numata , Toru Takayama , Masanao Seo
- 申请人： Atsushi Soma , Tomohiko Omura , Yuji Arai , Misuhiro Numata , Toru Takayama , Masanao Seo
- 申请人地址： JP Tokyo
- 专利权人： NIPPON STEEL & SUMITOMO METAL CORPORATION
- 当前专利权人： NIPPON STEEL & SUMITOMO METAL CORPORATION
- 当前专利权人地址： JP Tokyo
- 优先权： JP2011-180207 20110822
- 国际申请： PCT/JP2012/070888 WO 20120817
- 主分类号： C22C38/32
- IPC分类号： C22C38/32 ; C22C38/26 ; C22C38/24 ; C22C38/00 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/28 ; C22C38/22
摘要：
To provide an oil-well steel pipe having excellent SSC resistance. The oil-well steel pipe according to the present invention contains, by mass percent, C: 0.15 to 0.35%, Si: 0.1 to 0.75%, Mn: 0.1 to 1.0%, Cr: 0.1 to 1.7%, Mo: 0.1 to 1.2%, Ti: 0.01 to 0.05%, Nb: 0.010 to 0.030%, Al: 0.01 to 0.1%, P: at most 0.03%, S: at most 0.01%, N: at most 0.007%, and O: at most 0.01%, the balance being Fe and impurities. The Ti content and the Nb content in a residue obtained by bromine-methanol extraction satisfy equation (1): 100×[Nb]/([Ti]+[Nb])≦27.5 (1) where the Ti content (mass %) and the Nb content (mass %) in the residue are substituted for [Ti] and [Nb].
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