Patent ID: 8192562

Claim:
A spring steel wire excellent in fatigue characteristic and wire drawability wherein: said spring steel wire contains C: 0.50%-0.70%, Si: 1.0%-2.5%, Mn: 0.5%-1.5%, Cr: 0.5%-1.5%, Ti: 0.005%-0.10%, B: 0.0010%-0.0050%, N: 0.005% or less, P: 0.015% or less, S: 0.015% or less, Al: 0.03% or less, and O: 0.0015% or less; wherein for each chemical component, % means mass %; the contents (mass %) of B, Ti, and N satisfy the expression (1): 0.03≦B/(Ti/3.43−N)≦5.0 (1); the amount of solid solute B is in the range of 0.0005% to 0.0040%; the remainder in said spring steel wire is composed of Fe and unavoidable impurities; when the diameter of said steel wire is represented by D, the ferrite fraction at a position ¼ D in depth from the surface is 1 area % or less; and said solid solute B concentrates at the grain boundaries of pearlite nodules, and wherein the spring steel wire contains TiC.