Patent ID: 8911879

Claim:
A hot-dip Zn—Al—Mg—Si—Cr alloy-coated steel material having a coating layer on the surface of a steel material and having an interfacial alloy layer at the interface between said steel material and said coating layer, wherein the average composition of the entire coating layer consisting of said coating layer and said interfacial alloy layer contains, in mass %, Al: from 25 to 75%, Mg: from 0.1 to 10%, Si: more than 1% and 7.5% or less, and Cr: from 0.05 to 5.0%, with the balance being Zn and unavoidable impurities, wherein said interfacial alloy layer is composed of coating layer components and Fe and has a thickness of 0.05 to 10 μm or a thickness of 50% or less of the entire coating layer thickness, wherein said interfacial alloy layer has a multilayer structure consisting of an Al—Fe-based alloy layer and an Al—Fe—Si-based alloy layer, wherein said Al—Fe-based alloy layer contains Al, Fe, less than 2 mass % of Si and 0 mass % of Cr, wherein said Al—Fe—Si-based alloy layer contains Al, Fe, 2 mass % or more of Si and Cr, and wherein said Al—Fe—Si-based alloy layer consists of a layer containing Al, Fe, 2 mass % or more of Si and Cr and a layer containing Al, Fe, 2 mass % or more of Si and 0 mass % of Cr, and wherein the layer containing Al, Fe, 2 mass % or more of Si and Cr is in contact with the coating layer.