Invention Grant
- Patent Title: Steel sheet and method for producing the same
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Application No.: US17285375Application Date: 2019-10-16
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Publication No.: US12043876B2Publication Date: 2024-07-23
- Inventor: Yoshihiko Ono , Junya Tobata , Hiroyuki Akimoto , Yoichiro Matsui , Shinjiro Kaneko
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP 18196149 2018.10.17 JP 19165000 2019.09.11
- International Application: PCT/JP2019/040662 2019.10.16
- International Announcement: WO2020/080401A 2020.04.23
- Date entered country: 2021-04-14
- Main IPC: C21D1/22
- IPC: C21D1/22 ; C21D6/00 ; C21D8/02 ; C21D9/46 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/12 ; C22C38/14 ; C22C38/42 ; C22C38/44 ; C22C38/50 ; C22C38/54 ; C22C38/58
Abstract:
A steel sheet having a specified chemical composition and a method for producing the steel sheet. The steel sheet has a microstructure comprising ferrite: 5% or less, and at least one of upper bainite, fresh martensite, tempered martensite, lower bainite, and retained γ: 95% to 100%, and retained γ: 5% to 20%. Retained γUB has a specified area percentage SγUB, retained γLB has a specified distribution number NγLB, and at least one of (i) fresh martensite has a specified equivalent circular grain diameter and aspect ratio and (ii) retained γ grains has a specified equivalent circular grain diameter and aspect ratio.
Public/Granted literature
- US20220010397A1 STEEL SHEET AND METHOD FOR PRODUCING THE SAME Public/Granted day:2022-01-13
Information query
