POSCO Holdings Inc.
COLD-ROLLED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AND FORMABILITY, AND METHOD FOR MANUFACTURING SAME

Abstract:

Disclosed are a cold rolled steel sheet and a method for manufacturing same, the cold-rolled steel sheet: comprising, by wt %, 0.01% or less of C, 0.5% or less of Si, 0.1-0.5% of Mn, 0.1% or less of Al, 0.01% or less of P, 0.01% or less of S, 0.005% or less of N and 0.2-0.8% of Nb; comprising one or more of 0.5% or less of Sb, 3.0% or less of Cr, 1.0% or less of Mo and 0.5% or less of W; comprising the balance of Fe and inevitable impurities; and satisfying the following relation 1. [relation 1] 0.2.ltoreq.[Sb]/0.5+[Cr]/3.0+[Mo]/1.0+[W]/0.5.ltoreq.1.5 (Here, [Sb], [Cr], [Mo], and [W] respectively mean the amounts (wt %) of the corresponding elements contained.)