Invention Publication
- Patent Title: HOT-PRESSED MEMBER, STEEL SHEET FOR HOT PRESSING, AND METHODS FOR PRODUCING THE HOT-PRESSED MEMBER AND THE STEEL SHEET FOR HOT PRESSING
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Application No.: US18032298Application Date: 2021-08-18
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Publication No.: US20230392226A1Publication Date: 2023-12-07
- Inventor: Shuhei OGAWA , Minoru TANAKA , Rinta SATO , Daisuke MIZUNO , Seiji NAKAJIMA
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Priority: JP 20179397 2020.10.27
- International Application: PCT/JP2021/030091 2021.08.18
- Date entered country: 2023-04-17
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D8/02 ; C22C18/04 ; C21D7/02 ; C22C38/60 ; C22C38/32 ; C22C38/28 ; C22C38/26 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00

Abstract:
A hot-pressed member, a steel sheet for hot pressing, and methods for producing the hot-pressed member and the steel sheet for hot pressing. The hot-pressed member includes a steel sheet and a Zn-based alloy coated layer disposed on at least one surface of the steel sheet. The Zn-based alloy coated layer includes a solid solution phase including Zn with the balance being Fe and incidental impurities, an intermetallic compound phase including Fe with the balance being Zn and incidental impurities, and an oxide layer including Zn. The oxide layer serves as an uppermost layer of the Zn-based alloy coated layer and splits the intermetallic compound phase. The split density in at least one cross-section of the oxide layer per unit cross-section is 10 split positions/mm or more.
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