Wire Rod And Steel Wire For Spring, Spring, Having Improved Fatigue Resistance And Nitrification Properties, And Methods For Manufacturing Same

Abstract: Disclosed are a wire rod and a steel wire for a spring, a spring, having improved fatigue resistance and nitrification treatment properties, and methods for manufacturing same. The wire rod for a spring, having improved fatigue resistance and nitrification treatment characteristics, according to the present invention comprises, in wt%: 0.6 to 0.7% of C; 2.0 to 2.5% of Si; 0.2 to 0.5% of Mn; 0.9 to 1.6% of Cr; 0.015% or less of P; 0.01% or less of S; 0.01% or less of Al; 0.007% or less of N; 0.1 to 0.25% of Mo; 0.1 to 0.25% of V; and the balance of Fe and inevitable impurities, wherein Cr+Mn is 1.8% or less, Mo/V is 1.5 or less, and the microstructure includes a pearlite structure of 60% or more in the C section.

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