Invention Grant
- Patent Title: High-strength steel, method for manufacturing high-strength steel, steel pipe, and method for manufacturing steel pipe
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Application No.: US15560013Application Date: 2015-03-27
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Publication No.: US10954576B2Publication Date: 2021-03-23
- Inventor: Shusaku Ota , Junji Shimamura , Nobuyuki Ishikawa , Shigeru Endo
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- International Application: PCT/JP2015/001768 WO 20150327
- International Announcement: WO2016/157235 WO 20161006
- Main IPC: C21D9/08
- IPC: C21D9/08 ; C22C38/14 ; C22C38/58 ; C21D8/10 ; C22C38/00 ; C21D8/02 ; C21D9/46 ; C22C38/22 ; C21D6/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/16 ; C22C38/26 ; C22C38/28 ; C22C38/38 ; C22C38/42 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50
Abstract:
A high-strength steel having a specified chemical composition, wherein parameter Peff is 0.050% or more, the relationship (TS0−TS)/TS0≤0.050 is satisfied, wherein TS is defined as tensile strength determined at a temperature of 350° C. after aging has been performed under the condition of a Larson-Miller Parameter (LMP) of 15700, and wherein TS0 is defined as tensile strength determined at a temperature of 350° C. before the aging is performed, and having a toughness represented by a vE−20 of 100 J or more in a weld heat-affected zone, which is formed when welding is performed.
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