Invention Grant
- Patent Title: Hot-stamped steel
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Application No.: US15129640Application Date: 2015-03-31
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Publication No.: US09932652B2Publication Date: 2018-04-03
- Inventor: Akihiro Sengoku , Hiroshi Takebayashi
- Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2014-073814 20140331
- International Application: PCT/JP2015/060235 WO 20150331
- International Announcement: WO2015/152284 WO 20151008
- Main IPC: C22C38/50
- IPC: C22C38/50 ; C22C38/32 ; C22C38/28 ; C22C38/26 ; C22C38/22 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C22C38/54 ; C23C2/06 ; C23C2/40 ; B32B15/01 ; C21D9/46 ; C25D3/22 ; C25D5/36 ; C25D7/00 ; C21D1/18 ; C23C2/28 ; C23C28/02 ; C23C2/00 ; C23C30/00 ; B32B15/04 ; B32B15/18 ; C22C38/58 ; C25D5/50 ; C21D9/00 ; C21D1/673 ; C25D3/24

Abstract:
Hot-stamped steel includes: a base metal that is steel including a tempered portion having hardness corresponding to 85% or less of the highest quenching hardness, the highest quenching hardness being defined as a Vickers hardness at a depth position spaced away from a surface by ¼ times a sheet thickness in a case of performing water quenching after heating at a temperature equal to or higher than an Ac3 point and retention for 30 minutes; and a Zn coating layer that is formed on the tempered portion of the base metal. The Zn coating layer includes a solid-solution layer including a solid-solution phase that contains Fe and Zn that is solid-soluted in Fe, and a lamella layer that includes the solid-solution phase and a capital gamma phase. An area ratio of the lamella layer in the Zn coating layer is 20% or less.
Public/Granted literature
- US20170145532A1 HOT-STAMPED STEEL Public/Granted day:2017-05-25
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