Invention Grant
- Patent Title: Hot-dip galvanized steel sheet
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Application No.: US16635499Application Date: 2017-07-31
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Publication No.: US11426975B2Publication Date: 2022-08-30
- Inventor: Atsushi Morishita , Taihei Kaneto , Satoshi Uchida , Tatsuya Nakada , Yuji Yamaguchi
- Applicant: NIPPON STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- International Application: PCT/JP2017/027659 WO 20170731
- International Announcement: WO2019/026116 WO 20190207
- Main IPC: B32B15/01
- IPC: B32B15/01 ; C22C38/00 ; C22C38/02 ; C22C38/06 ; C22C38/08 ; C22C38/16 ; C22C38/22 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/38 ; C21D6/00 ; C21D8/02 ; C21D9/46 ; C23C2/06 ; C23C2/40

Abstract:
In a thickness range of which center is a ¼ thickness from the surface of a base steel sheet, a volume fraction of a ferrite phase is 0% to less than 50%, a volume fraction of the total of a hard structure composed of one or more of a bainite structure, a bainitic ferrite phase, a fresh martensite phase, and a tempered martensite phase is 50% or more, a volume fraction of a retained austenite phase is 0-8%, and a volume fraction of the total of a pearlite phase and a coarse cementite phase is 0-8%, at an interface between a plating layer and the base steel sheet, a Fe—Al alloy layer is provided, the Fe—Al alloy layer having an average thickness of 0.1-2.0 μm and a difference between a maximum thickness and a minimum thickness in the width direction of the steel sheet being within 0.5 μm.
Public/Granted literature
- US20200230918A1 HOT-DIP GALVANIZED STEEL SHEET Public/Granted day:2020-07-23
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