Invention Grant
- Patent Title: Steel sheet for crown cap, crown cap and method for producing steel sheet for crown cap
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Application No.: US16628793Application Date: 2018-07-25
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Publication No.: US11359255B2Publication Date: 2022-06-14
- Inventor: Nobusuke Kariya , Takashi Ueno , Yoshihide Yamamoto , Katsumi Kojima , Bungo Tateno
- 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: JPJP2017-148315 20170731
- International Application: PCT/JP2018/027995 WO 20180725
- International Announcement: WO2019/026739 WO 20190207
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C21D8/02 ; C21D6/00 ; B65D41/12

Abstract:
A steel sheet for crown cap having: a chemical composition containing, C, Si, Mn, P, S, Al, N, with the balance being Fe and inevitable impurities; a ferrite phase in a region from a depth of ¼ of a sheet thickness to a mid-thickness part, the ferrite phase having a standard deviation of ferrite grain size of 7.0 μm or less; a yield strength of 560 MPa or more and 700 MPa or less in a rolling direction; and a difference of 25 MPa or more between a yield strength in a 2% strain tensile test and a yield strength in a tensile test after heat treatment at 170° C. for 20 minutes, in the rolling direction.
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