Invention Grant
- Patent Title: Low-yield ratio high-strength electric resistance welded steel pipe, steel strip for electric resistance welded steel pipes, and methods of manufacturing them
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Application No.: US14390514Application Date: 2012-04-09
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Publication No.: US09765417B2Publication Date: 2017-09-19
- Inventor: Yasuhiro Matsuki , Tomohiro Inoue
- Applicant: Yasuhiro Matsuki , Tomohiro Inoue
- Applicant Address: JP
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP
- Agency: DLA Piper LLP (US)
- International Application: PCT/JP2012/060194 WO 20120409
- International Announcement: WO2013/153676 WO 20131017
- Main IPC: C22C38/06
- IPC: C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C22C38/16 ; B23K11/16 ; B23K11/087 ; F16L9/02 ; C22C38/18 ; C22C38/08 ; C21D8/02 ; C21D8/10 ; C21D9/08 ; F16L9/16
Abstract:
A low-yield ratio high-strength electric resistance welded steel pipe has a yield ratio of 80% or less and a TS of 655 MPa or more. A steel material has a composition containing 0.38% to 0.45% C, 0.1% to 0.3% Si, 1.0% to 1.8% Mn, 0.03% or less P, 0.03% or less S, 0.01% to 0.07% sol. Al, and 0.01% or less N on a mass basis.
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