POSCO Holdings Inc.
HIGH-STRENGTH HOT-DIP ZINC PLATED STEEL MATERIAL HAVING EXCELLENT PLATING PROPERTIES AND METHOD FOR PREPARING SAME

Abstract:

Provided are a hot-dip zinc plated steel material and a method for preparing same, the hot-dip zinc plated steel material comprising: base iron comprising 0.01-1.6 wt % of Si and 1.2-3.1 wt % of Mn; a Zn--Al--Mg alloy plating layer; and an Al-rich layer formed on the interface of the base iron and Zn--Al--Mg alloy plating layer, wherein the rate of occupied surface area of the Al-rich layer is 70% or higher (including 100%).