发明授权
- 专利标题: High-strength steel pipe and producing method thereof
- 专利标题(中): 高强度钢管及其制造方法
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申请号: US13261070申请日: 2010-06-10
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公开(公告)号: US08685182B2公开(公告)日: 2014-04-01
- 发明人: Kensuke Nagai , Yasuhiro Shinohara , Shinya Sakamoto , Takuya Hara , Hitoshi Asahi
- 申请人: Kensuke Nagai , Yasuhiro Shinohara , Shinya Sakamoto , Takuya Hara , Hitoshi Asahi
- 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
- 代理机构: Kenyon & Kenyon LLP
- 优先权: JP2009-140280 20090611
- 国际申请: PCT/JP2010/003866 WO 20100610
- 国际公布: WO2010/143433 WO 20101216
- 主分类号: C22C38/48
- IPC分类号: C22C38/48 ; C22C38/50 ; C21D8/10
摘要:
This high-strength steel pipe includes, by mass %, C: 0.02% to 0.09%, Mn: 0.4% to 2.5%, Cr: 0.1% to 1.0%, Ti: 0.005% to 0.03%, Nb: 0.005% to 0.3%, and a balance consisting of Fe and inevitable impurities, in which Si, Al, P, S, and N are limited to 0.6% or less, 0.1% or less, 0.02% or less, 0.005% or less, 0.008% or less, respectively, the bainite transformation index BT is 650° C. or less, and the microstructure thereof is a single bainite microstructure including first bainite and second bainite, the first bainite being a gathered microstructure of bainitic ferrite including no carbide, and the second bainite being a mixed microstructure of bainitic ferrite including no carbide and cementite between the bainitic ferrites.
公开/授权文献
- US20120118425A1 High-strength steel pipe and producing method thereof 公开/授权日:2012-05-17