Invention Grant
- Patent Title: Hot-pressed steel sheet member and method for producing same
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Application No.: US16762501Application Date: 2018-11-07
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Publication No.: US11339452B2Publication Date: 2022-05-24
- Inventor: Katsutoshi Takashima , Takayuki Futatsuka , Kentaro Sato , Shimpei Yoshioka , Yoshihiko Ono , 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: Kenja IP Law PC
- Priority: JPJP2017-218304 20171113
- International Application: PCT/JP2018/041381 WO 20181107
- International Announcement: WO2019/093384 WO 20190516
- Main IPC: C22C38/58
- IPC: C22C38/58 ; C22C38/54 ; C22C38/52 ; C22C38/50 ; C22C38/48 ; C22C38/46 ; C22C38/44 ; C22C38/42 ; C22C38/06 ; C22C38/02 ; C22C38/00 ; C22C38/60 ; B32B15/01 ; C21D6/00 ; C21D8/02 ; C21D9/46 ; C23C2/06 ; C23C2/12 ; C21D1/18 ; C22C38/04 ; C22C38/12 ; C23C2/26 ; C23C2/40 ; C23C2/28 ; C23C30/00 ; B32B15/04 ; B32B15/18 ; C22C38/26 ; C22C38/18 ; C22C38/28 ; C22C38/34 ; C22C38/24 ; C22C38/14 ; C22C38/30 ; C22C38/20 ; C22C38/32 ; C22C38/40 ; C22C38/10 ; C22C38/22 ; C22C38/38 ; C22C38/16
Abstract:
Disclosed is a hot-pressed steel sheet member having a tensile strength of 1780 MPa or more and excellent bending collapsibility. The hot-pressed steel sheet member includes: a specific chemical composition; a microstructure in which an average grain size of prior austenite grains is 8 μm or less, a volume fraction of martensite is 90% or more, and a solute C content is 25% or less of a total C content; and a tensile strength of 1780 MPa or more.
Public/Granted literature
- US20210130919A1 HOT-PRESSED STEEL SHEET MEMBER AND METHOD FOR PRODUCING SAME Public/Granted day:2021-05-06
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