POSCO Holdings Inc.
HETEROGENEOUS COATED STEEL SHEET HAVING EXCELLENT WORKABILITY AND CORROSION RESISTANCE, AND METHOD FOR MANUFACTURING SAME

Abstract:

Provided is a coated steel sheet which can be used in vehicles, home appliances, construction materials, and the like, and more specifically, to a heterogeneous coated steel sheet having a zinc coating layer formed on one surface thereof and a zinc-magnesium coating layer formed on the other surface thereof. The heterogeneous coated steel sheet includes: a steel sheet; a zinc coating layer attached to one side of the steel sheet; and a zinc-magnesium alloy coating layer attached to the other side of the steel sheet, wherein a coating adhesion amount of the zinc coating layer is 5 to 60 g/m.sup.2, a coating adhesion amount of the zinc-magnesium alloy coating layer is 10 to 40 g/m.sup.2, and a magnesium content of the zinc-magnesium alloy coating layer is 8 to 30 wt %.