- Patent Title: Hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet with excellent aging resistance properties and bake hardenability, and method for manufacturing same
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Application No.: US15743490Application Date: 2016-06-16
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Publication No.: US10907233B2Publication Date: 2021-02-02
- Inventor: Sang-Ho Han , Je-Woong Lee
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Cantor Colburn LLP
- Priority: KR10-2016-0041648 20160405
- International Application: PCT/KR2016/006398 WO 20160616
- International Announcement: WO2017/018659 WO 20170202
- Main IPC: C23C2/06
- IPC: C23C2/06 ; C22C38/04 ; C21D9/46 ; B32B15/01 ; C21D8/02 ; C23C2/28 ; C22C38/06 ; C22C38/22 ; C22C38/32 ; C22C38/38 ; C22C38/18 ; C23C2/02 ; C22C38/00 ; C21D6/00 ; C23C2/40

Abstract:
Provided are a hot-dip galvanized steel sheet and a hot-dip galvannealed steel sheet with excellent aging-resistance properties and bake hardenability, and a method for manufacturing the same. The hot-dip galvanized steel sheet has a molten zinc plated layer on the surface of a base steel sheet, wherein the base steel sheet comprises: 0.002-0.012 wt % of carbon (C); 1.6-2.7 wt % of manganese (Mn); 0.03 wt % or less (excluding 0 wt %) of phosphorus (P); 0.01 wt % or less (excluding 0 wt %) of sulfur (S); 0.01 wt % or less (excluding 0 wt %) of nitrogen (N); 0.02-0.06 wt % of aluminum (sol.Al); 1.0 wt % or less (excluding 0 wt %) of chromium (Cr), with the remainder being iron and inevitable impurities; the base steel sheet satisfies the relation of 1.3≤Mn(wt %)/(1.15×Cr(wt %))≤20.5; Mneq defined by relational expression 1 satisfies 1.9≤Mneq≤3.9.
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