POSCO Holdings Inc.
WIRE ROD AND STEEL WIRE FOR SPRINGS HAVING EXCELLENT CORROSION FATIGUE RESISTANCE PROPERTIES, AND METHOD FOR PRODUCING SAME

Abstract:

An embodiment of the present invention provides a wire rod and a steel wire which are for springs and have excellent corrosion fatigue resistance properties, and a method for producing same, the wire rod and steel wire containing, in wt o, 0.40-0.70% of C, 1.20-2.30% of Si, 0.20-0.80% of Mn, 0.20-0.80% of Cr, 0.015% or less of P, 0.015% or less of S, and 0.010% or less of N, with the remainder comprising Fe and other unavoidable impurities, along with at least one among 0.01-0.20% of V and 0.01-0.10% of Nb, wherein the V and Nb satisfy relational expression 1 below, the average grain size of prior austenite is no greater than 20 pm, and the surface decarburization depth is no greater than 0.1 mm. [Relational expression 1] [V]+[Nb].gtoreq.0.08 (where the V and Nb contents are in wt %)