Invention Grant
- Patent Title: High-strength steel sheet and production method therefor
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Application No.: US15547876Application Date: 2016-01-27
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Publication No.: US11035019B2Publication Date: 2021-06-15
- Inventor: Hidekazu Minami , Shinjiro Kaneko , Takeshi Yokota , Kazuhiro Seto
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Kenja IP Law PC
- Priority: JPJP2015-019581 20150203
- International Application: PCT/JP2016/000408 WO 20160127
- International Announcement: WO2016/125462 WO 20160811
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C23C2/06 ; C23C2/28 ; C22C38/12 ; C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C23C2/02 ; C22C38/60 ; C21D1/25 ; B32B15/01 ; C21D6/00
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
- US20180179610A9 HIGH-STRENGTH STEEL SHEET AND PRODUCTION METHOD THEREFOR Public/Granted day:2018-06-28
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