Wire Rod And Steel Wire For Spring, Spring With Improved Strength And Fatigue Limit, And Method For Manufacturing Same

Abstract: Disclosed are a wire rod and a steel wire for a spring, a spring with improved strength and fatigue limit, and a method for manufacturing same. The disclosed wire rod for a spring with improved strength and fatigue limit, according to one embodiment, comprises, in percentage by weight: C: 0.6-0.7%; Si: 2.0-2.5%; Mn: 0.2-0.7%; Cr: 0.9-1.5%; P: 0.015% or less; S: 0.01% or less; Al: 0.01% or less; N: 0.01% or less; Mo: 0.25% or less; W: 0.25% or less; V: 0.05-0.2% or less; Nb: 0.05% or less; and the balance consisting of Fe and unavoidable impurities, wherein Mn+Cr=1.8% may be satisfied, and 0.05 at%=Mo+W=0.15 at% may be satisfied.

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