Invention Grant
- Patent Title: Thick-walled high-strength seamless steel pipe with excellent sour resistance for pipe for pipeline, and process for producing same
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Application No.: US14129810Application Date: 2012-06-29
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Publication No.: US09932651B2Publication Date: 2018-04-03
- Inventor: Yasuhide Ishiguro , Mitsuo Kimura , Kenichiro Eguchi , Hiroshi Yokogawa , Tadao Katagiri , Masahito Tanaka
- Applicant: Yasuhide Ishiguro , Mitsuo Kimura , Kenichiro Eguchi , Hiroshi Yokogawa , Tadao Katagiri , Masahito Tanaka
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JP2011-146131 20110630
- International Application: PCT/JP2012/067254 WO 20120629
- International Announcement: WO2013/002418 WO 20130103
- Main IPC: C21D8/08
- IPC: C21D8/08 ; C21D9/08 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/14 ; C22C38/20 ; C22C38/22 ; C22C38/24 ; C22C38/28 ; C22C38/38 ; C22C38/40 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50 ; C22C38/58 ; F16L9/02 ; C21D1/25 ; C21D1/63 ; C21D8/10
Abstract:
A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the Vickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less.
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