| abstract |
Disclosed is a high-strength Zn-Al coated steel wire for bridges with excellent corrosion resistance and fatigue properties, the Zn-Al coated steel wire includes: a steel wire; and a Zn-Al coating having a coating body layer and an Fe-Al alloy layer formed in an interface between a surface layer of the steel wire and the coating body layer, wherein a chemical composition of a core material of the steel wire includes, by mass %: C : 0.70% to 1.2%; Si : 0.01 % to 2.5%; Mn : 0.01 % to 0.9%; P : limited to 0.02% or less; S : limited to 0.02% or less; N : limited to 0.01 % or less; and the balance including Fe and unavoidable impurities, wherein wire-drawn pearlite is most abundant microstructure among microstructures of the core material of the steel wire; wherein an average composition of the Zn-Al coating includes, by mass %, Al : 3.0 to 15.0%; and Fe : limited to 3.0% or less, and wherein the Fe-Al alloy layer has a thickness of 5 µm or less. |