THE MANUFACTURING METHOD FOR WIRE ROD WITH EXCELLENT WIRE DRAWING PROPERTY

摘要

PURPOSE: A method for manufacturing a high strength wire rod having superior drawability of rod is provided to manufacture a wire rod representing a high strength of 220 kg/mm2 or more and satisfactory ductility without intermediate heat treatment by properly controlling alloy constituents of steel and a cooling rate of the hot rolled wire rod. CONSTITUTION: The method comprises the processes of hot rolling a steel comprising 0.65 to 0.85 wt.% of C, 0.1 to 0.5 wt.% of Mn, 0.1 to 0.5 wt.% of Si, a balance of Fe and other inevitable impurities, and one or more elements selected from the group consisting of 0.1 to 1.0 wt.% of Ni, 0.1 to 1.0 wt.% of Cu and 0.2 wt.% or less of Cr; manufacturing the cooled steel into a wire rod by cooling the hot rolled steel in a cooling rate of 18 to 25 deg.C/sec; and wire drawing the wire rod to a drawing ratio of 2.5 or more.