Invention Application
- Patent Title: HOT-DIP GALVANIZED STEEL SHEET
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Application No.: US16635511Application Date: 2017-07-31
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Publication No.: US20200156349A1Publication Date: 2020-05-21
- 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
- International Application: PCT/JP2017/027656 WO 20170731
- Main IPC: B32B15/01
- IPC: B32B15/01 ; C22C38/28 ; C21D9/46 ; C22C38/38 ; C21D6/00 ; C22C38/26 ; C22C38/02 ; C22C38/00 ; C22C38/22 ; C22C38/08 ; C22C38/32 ; C21D8/02 ; C22C38/16 ; C22C38/06

Abstract:
There is provided a hot-dip galvanized steel sheet with a microstructure in a ⅛ thickness to ⅜ thickness range whose middle is a ¼ thickness from a surface of a base steel sheet, the microstructure contains ferrite phase is 50% or more and 97% or less by volume fraction, and a predetermined phase wherein at an interface between a hot-dip galvanizing layer and the base steel sheet, a Fe—Al alloy layer has an average thickness of 0.1 μm to 2.0 μm, and a difference between a maximum thickness and a minimum thickness in a steel sheet width direction is within 0.5 μm, and in a fine-grain layer directly brought into contact with the Fe—Al alloy layer, the fine-grain has a difference between a maximum thickness and a minimum thickness of the fine-grain layer in the steel sheet width direction is within 2.0 μm.
Public/Granted literature
- US10953631B2 Hot-dip galvanized steel sheet Public/Granted day:2021-03-23
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