POSCO Holdings Inc.
High manganese hot dip aluminum-plated steel sheet having excellent sacrificial corrosion resistance and platability and manufacturing method therefor

Abstract:

Provided are a high manganese hot dip aluminum-plated steel sheet and a method for manufacturing the same, the steel sheet including: a base steel comprising, by wt %, 0.3-0.9% of C, 10-25% of Mn, 0.01-0.5% of Ti, 0.01-0.2% of Sn, 0.01-0.1% of Sb, and the balance of Fe and inevitable impurities; a hot dip aluminum-based steel plated layer formed on the base steel sheet and comprising 0.1 wt % or more of a sum of one or more types among Li, Na, and K, and the balance of Al and inevitable impurities; and an Al--Fe--Si--Mn based alloy layer formed between the base steel sheet and the aluminum-based plated layer, and having a dual structure with different average Fe amounts.