Invention Application
- Patent Title: HOT-PRESSED MEMBER, METHOD FOR MANUFACTURING THE SAME, AND METHOD FOR MANUFACTURING STEEL SHEET FOR HOT-PRESSED MEMBER
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Application No.: US17432349Application Date: 2019-11-21
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Publication No.: US20220056552A1Publication Date: 2022-02-24
- Inventor: Shimpei YOSHIOKA , Yoshihiko ONO , Katsutoshi TAKASHIMA , Takayuki FUTATSUKA , Kentaro SATO
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Priority: JP2019-030344 20190222
- International Application: PCT/JP2019/045678 WO 20191121
- Main IPC: C21D9/48
- IPC: C21D9/48 ; C21D8/02 ; C21D6/00 ; B32B15/01 ; C23C2/40 ; C22C38/38 ; C22C38/28 ; C22C38/26 ; C22C38/60 ; C22C38/16 ; C22C38/12 ; C22C38/08 ; C22C38/10 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00

Abstract:
A hot-pressed member having excellent bending collapsibility, a method for manufacturing the same, and a method for manufacturing a steel sheet for the hot-pressed member. The hot-pressed member includes a steel sheet as a base material, the steel sheet having a specified chemical composition. The hot-pressed member has a microstructure in which a martensite microstructure is present in a volume fraction of 70% or greater, and a number density of inclusions having a longest diameter of 25 μm or greater is 0.02/mm2 or less. The hot-pressed member has a tensile strength of 1.8 GPa or greater.
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