Invention Grant
- Patent Title: High-strength cold-rolled steel sheet
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Application No.: US16077266Application Date: 2017-02-15
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Publication No.: US11008635B2Publication Date: 2021-05-18
- Inventor: Shimpei Yoshioka , Yoshihiko Ono , Yusuke Kimata , Hiroyuki Masuoka
- 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: JPJP2016-028881 20160218
- International Application: PCT/JP2017/005467 WO 20170215
- International Announcement: WO2017/141953 WO 20170824
- Main IPC: C22C38/16
- IPC: C22C38/16 ; C22C38/60 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/10 ; C22C38/12 ; C22C38/14 ; C22C38/20 ; C22C38/34 ; C22C38/32 ; C22C38/38 ; C21D9/46 ; C21D6/00 ; C21D8/02

Abstract:
Provided is a high-strength cold-rolled steel sheet has a chemical composition containing, by mass %, C: 0.10% or more and 0.6% or less, Si: 1.0% or more and 3.0% or less, Mn: more than 2.5% and 10.0% or less, P: 0.05% or less, S: 0.02% or less, Al: 0.01% or more and 1.5% or less, N: 0.005% or less, Cu: 0.05% or more and 0.50% or less, and the balance being Fe and inevitable impurities, and a tensile strength of 1180 MPa or more, in which a steel sheet surface coverage of oxides mainly containing Si is 1% or less, a steel sheet surface coverage of iron-based oxides is 40% or less, CuS/CuB is 4.0 or less, and a tensile strength is 1180 MPa or more, where CuS denotes a Cu concentration in a surface layer of a steel sheet and CuB denotes a Cu concentration in base steel.
Public/Granted literature
- US20190040490A1 HIGH-STRENGTH COLD-ROLLED STEEL SHEET Public/Granted day:2019-02-07
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