Invention Publication
- Patent Title: STEEL SHEET, MEMBER, AND METHODS FOR MANUFACTURING THE SAME
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Application No.: US18277874Application Date: 2022-01-28
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Publication No.: US20240132986A1Publication Date: 2024-04-25
- Inventor: Katsuya Hata , Shimpei Yoshioka , Shinjiro Kaneko
- Applicant: JFE Steel Corporation
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Priority: JP 21032530 2021.03.02
- International Application: PCT/JP2022/003320 2022.01.28
- Date entered country: 2023-08-17
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D1/18 ; C21D6/00 ; C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/16 ; C22C38/22 ; C22C38/24 ; C22C38/28 ; C22C38/34 ; C22C38/38 ; C22C38/60

Abstract:
A steel sheet has a chemical composition containing, by mass %, C: 0.20% or more and 0.40% or less, Si: more than 1.0% and 3.0% or less, Mn: 1.5% or more and 3.5% or less, P: 0.002% or more and 0.010% or less, S: 0.0002% or more and 0.0020% or less, sol. Al: 0.40% or less (not including 0%), and N: 0.0100% or less, with the balance being Fe and incidental impurities; and a steel microstructure containing, in area fraction, tempered martensite: 45% or more and 83% or less, bainite: 15% or more and 53% or less, and retained austenite: 2% or more. Carbides in the tempered martensite have an average particle size of 0.40 μm or less, an average amount of C in the retained austenite is 0.5% by mass or more, and a tensile strength is 1,470 MPa or more.
Public/Granted literature
- US20240229180A9 STEEL SHEET, MEMBER, AND METHODS FOR MANUFACTURING THE SAME Public/Granted day:2024-07-11
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