Invention Grant
- Patent Title: High-strength steel sheet and production method therefor
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Application No.: US15547659Application Date: 2016-01-27
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Publication No.: US10472697B2Publication Date: 2019-11-12
- Inventor: Hidekazu Minami , Shinjiro Kaneko , Takeshi Yokota , Kazuhiro Seto
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Chiyoda-ku, Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Chiyoda-ku, Tokyo
- Agency: Kenja IP Law PC
- Priority: JP2015-019562 20150203
- International Application: PCT/JP2016/000407 WO 20160127
- International Announcement: WO2016/125461 WO 20160811
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C22C38/02 ; C22C38/60 ; C22C38/06 ; C22C38/12 ; C22C38/14 ; C22C38/04 ; C23C2/02 ; C23C2/06 ; C23C2/28
Abstract:
A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 μm or less. An inverse intensity ratio of γ-fiber to α-fiber in the ferrite is 1.00 or more and an inverse intensity ratio of γ-fiber to α-fiber in the martensite and the tempered martensite is 1.00 or more.
Public/Granted literature
- US20180023161A1 HIGH-STRENGTH STEEL SHEET AND PRODUCTION METHOD THEREFOR Public/Granted day:2018-01-25
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