Invention Grant
- Patent Title: High strength stainless steel pipe for use in oil well having superior corrosion resistance and manufacturing method thereof
- Patent Title (中): 用于具有优异耐腐蚀性的油井的高强度不锈钢管及其制造方法
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Application No.: US10568154Application Date: 2004-08-11
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Publication No.: US07767037B2Publication Date: 2010-08-03
- Inventor: Mitsuo Kimura , Takanori Tamari , Yoshio Yamazaki , Ryosuke Mochizuki
- Applicant: Mitsuo Kimura , Takanori Tamari , Yoshio Yamazaki , Ryosuke Mochizuki
- Applicant Address: JP
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP
- Agency: DLA Piper LLP (US)
- Priority: JP2003-295163 20030819; JP2004-016076 20040123; JP2004-071640 20040312; JP2004-135974 20040430; JP2004-210904 20040720
- International Application: PCT/JP2004/011809 WO 20040811
- International Announcement: WO2005/017222 WO 20050224
- Main IPC: C22C38/22
- IPC: C22C38/22 ; C22C38/24 ; C22C38/00 ; C22C38/18

Abstract:
A stainless steel pipe for use in oil wells which has a high strength having a YS of 654 MPa or more and superior corrosion resistance even in a severe corrosive environment in which CO2 and are present and the temperature is high, such as up to 230° C. The pipe contains on a mass percent basis: 0.005% to 0.05% of C; 0.05% to 0.5% of Si; 0.2% to 1.8% of Mn; 0.03% or less of P; 0.005% or less of S; 15.5% to 18% of Cr; 1.5% to 5% of Ni; 1% to 3.5% of Mo; 0.02% to 0.2% of V; 0.01% to 0.15% of N; 0.006% or less of 0; and the balance being Fe and unavoidable impurities, in which Cr+0.65Ni+0.6Mo+0.55Cu−20C≧19.5 and Cr+Mo+0.3Si−43.5C−0.4Mn−Ni−0.3Cu−9N≧11.5 are satisfied (where Cr, Ni, Mo, Cu, C, Si, Mn, and N represent the respective contents on a mass percent basis). In addition, quenching treatment and tempering treatment are preferably performed, so that the pipe preferably has a texture containing a martensite phase as a primary phase and 10 to 60 percent by volume of a ferrite phase, or further containing 30 percent by volume or less of an austenite phase. Furthermore, at least one of Al, Cu, Nb, Ti, Zr, W, B, and Ca may also be contained.
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