POSCO Holdings Inc.
ALUMINUM-BASED ALLOY PLATED STEEL SHEET HAVING EXCELLENT PROCESSING PART CORROSION RESISTANCE

Abstract:

Provided is an aluminum-based alloy plate steel sheet, which comprises a base steel sheet, an interfacial alloy layer, and an aluminum-based plated layer comprising a Mg--Si-based alloy phase, and in which b/a is 1-5 when the area fraction of the Mg--Si-based alloy phase contained in the aluminum-based plated layer is a and the area fraction of the Mg--Si-based alloy phase contained in the region of the lower 20% in the thickness direction of the aluminum-based plated layer is b.