Patent ID: 11873561
Assignee: POSCO CO., LTD
Field: Surface technology, coating (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 0:
1. A method of manufacturing a hot-dip galvanized steel sheet having excellent press formability and image clarity after painting, comprising:
manufacturing a hot-dip galvanized steel sheet by hot-dip zinc coating a matrix steel sheet; and
charging the hot-dip galvanized steel sheet in a skin-pass mill and skin-pass-rolling the hot-dip galvanized steel sheet,
wherein the skin-pass-rolling uses a roll having roughness skewness (Rsk) of −0.2 or lower, average roughness (Ra) of 2 μm or less, excluding 0, and the number of peaks (RPc) in each unit length of 140 count/cm or higher.