Invention Application
- 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.: US20180016656A1Publication Date: 2018-01-18
- 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
- Priority: JP2015-019581 20150203
- International Application: PCT/JP2016/000408 WO 20160127
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C23C2/06 ; C22C38/12 ; C22C38/06 ; C21D6/00 ; C22C38/02 ; B32B15/01 ; C22C38/00 ; C21D8/02 ; C23C2/28 ; C22C38/04
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
- US11035019B2 High-strength steel sheet and production method therefor Public/Granted day:2021-06-15
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