Shift, it pulls and the steel wire material for the spring, pulls shift and the wire drawing material for the spring and pulls shift and the spring and pulls shift production manner null

摘要

PROBLEM TO BE SOLVED: To provide a steel wire rod and a wire drawing rod for a spring for producing a hard-drawn spring which exhibits excellent fatigue strength and permanent set resistance in fatigue equal to those of a spring using an oil tempered steel wire, the hard-drawn spring, a useful method for producing the hard-drawn spring at a low cost and the like.;SOLUTION: The steel wire rod for a hard-drawn spring has a composition containing, by mass, 0.5 to 0.7% C, 1.6 to 3% Si, 0.5 to 1.5% Mn, 0.05 to 0.5% Ni, 0.05 to 1.5% Cr and 0.05 to 0.25% V, and in which the area ratio Rp of the pearlitic structure satisfies the following inequality (1): Rp (area %)≥55×[C]+61...(1); wherein, [C] denotes the content (mass%) of C.;COPYRIGHT: (C)2002,JPO