Invention Grant
- Patent Title: Steel sheet, coated steel sheet, method for producing steel sheet, and method for producing coated steel sheet
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Application No.: US16087468Application Date: 2017-03-07
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Publication No.: US10941461B2Publication Date: 2021-03-09
- Inventor: Hidekazu Minami , Yoshimasa Funakawa
- Applicant: JFE Steel Corporation
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JPJP2016-070748 20160331,JPJP2016-232542 20161130
- International Application: PCT/JP2017/008956 WO 20170307
- International Announcement: WO2017/169560 WO 20171005
- Main IPC: C22C38/20
- IPC: C22C38/20 ; C22C38/14 ; C22C38/12 ; C22C38/10 ; C22C38/08 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; B32B15/01 ; C21D9/46 ; C21D8/02 ; C21D6/00 ; C23C2/06 ; C22C38/60 ; C25D5/50 ; C23C2/40 ; C23C2/12 ; C23C2/28 ; C25D7/06 ; C22C38/30 ; C22C38/32 ; C22C38/52 ; C22C38/16 ; C23C30/00 ; C22C38/28 ; C22C38/48 ; C22C38/40 ; C22C38/22 ; C22C38/24 ; C22C38/54 ; C22C38/42 ; C22C38/26 ; C23C2/00 ; C22C38/18 ; C22C38/44 ; C22C38/50 ; C23C2/04 ; C22C38/46 ; B32B15/04 ; B32B15/18
Abstract:
A steel sheet is provided, having a tensile strength of 340 MPa or more, a particular composition and a steel structure in which ferrite has an average crystal grain size of 5 μm or more and 25 μm or less, 40% or more of cementite in terms of area fraction precipitates in ferrite grain boundaries, and the ferrite has a texture in which an inverse intensity ratio of γ-fiber to α-fiber is 0.8 or more and 7.0 or less.
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