Invention Grant
- Patent Title: High tensile strength steel having favorable delayed fracture resistance and method for manufacturing the same
- Patent Title (中): 具有良好延迟耐断裂性的高抗拉强度钢及其制造方法
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Application No.: US12524988Application Date: 2008-01-31
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Publication No.: US08357252B2Publication Date: 2013-01-22
- Inventor: Akihide Nagao , Kenji Oi , Kenji Hayashi , Nobuo Shikanai
- Applicant: Akihide Nagao , Kenji Oi , Kenji Hayashi , Nobuo Shikanai
- Applicant Address: JP
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP
- Agency: DLA Piper LLP (US)
- Priority: JP2007-021573 20070131; JP2007-086296 20070329
- International Application: PCT/JP2008/052002 WO 20080131
- International Announcement: WO2008/093897 WO 20080807
- Main IPC: C21D8/02
- IPC: C21D8/02 ; C22C38/00 ; C22C38/22 ; C22C38/44
Abstract:
High tensile strength steels that have both favorable delayed fracture resistance and a tensile strength of 600 MPa or higher and are suitably used in construction machinery, tanks, penstocks, and pipelines, as well as methods for manufacturing such steels are provided. The safety index of delayed fracture resistance (%) is 100×(X1/X0), where X0: reduction of area of a specimen substantially free from diffusible hydrogen, and X1: reduction of area of a specimen containing diffusible hydrogen.
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