| 摘要 |
A hot-dip galvanized steel sheet comprising a base steel sheet and a hot-dip galvanizing layer, the hot-dip galvanized steel sheet having a hot-dip galvanizing layer in which columnar crystals comprising 5% or less of Fe, 1.0% or less of Al, and a ζ phase are interposed in 20% or more of the entire interface of the plating layer and the steel sheet on the surface of a base steel sheet in which a ferrite phase constitutes 50% or less and a hard structure constitutes 50% or more in terms of volume ratio in a range of 1/8 thickness to 3/8 thickness from the surface of the base steel sheet, and, in a range to a depth of 20 µm in the base steel sheet starting from the interface of the plating layer and the base steel sheet, the volume ratio of residual austenite is 3% or less and the volume ratio of the hard structure is 0.10-0.90 times the volume ratio thereof in the range of 1/8 thickness to 3/8 thickness, the hot-dip galvanized steel sheet having a refined layer on the interface side of the base steel sheet, and the average thickness of the refined layer, the average grain size of a ferrite phase in the refined layer, and the maximum diameter of oxides included in the refined layer each being prescribed. |
