Invention Grant
- Patent Title: Hot-dip galvanized steel sheet with excellent surface quality and resistance to low temperature brittle fracture
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Application No.: US16062945Application Date: 2016-12-22
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Publication No.: US11078564B2Publication Date: 2021-08-03
- Inventor: Sang-Heon Kim
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Cantor Colburn LLP
- Priority: KR10-2015-0184111 20151222
- International Application: PCT/KR2016/015075 WO 20161222
- International Announcement: WO2017/111484 WO 20170629
- Main IPC: B32B15/01
- IPC: B32B15/01 ; C23C2/06 ; C23C2/40 ; C22C18/04 ; C22C38/00 ; C22C18/00 ; C23C2/26 ; C23C2/02 ; C21D9/46

Abstract:
Provided is a hot-dip galvanized steel sheet including a base steel sheet and a hot-dip zinc-based plating layer formed on the base steel sheet. The hot-dip zinc-based plating layer includes a Zn single phase having an average equivalent circular diameter of 120 μm or less as a microstructure. In the Zn single phase, a Zn single phase having a crystal structure of which a {0001} plane is parallel to a surface of the steel sheet, is provided in an area fraction of 70% or less.
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