POSCO Holdings Inc.
ALLOY COATED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Abstract:

The present invention relates to an alloy-coated steel sheet comprising: a steel sheet, and Al--Mg--Si--Zn alloy layer positioned on the steel sheet, wherein the Al--Mg--Si--Zn alloy layer comprises a Mg--Zn alloy phase, and wherein the Mg--Zn alloy phase comprises MgZn.sub.2 and Mg.sub.2Zn.sub.11, and the Mg--Zn alloy phase further comprises at least one of MgZn, Mg.sub.21Zn.sub.25, Mg.sub.51Zn.sub.20 and Mg.sub.2Zn.sub.3.