High-strength spring steel having excellent wire-rod rolling properties

Abstract

The present invention relates to a high-strength spring steel having excellent wire-rod rolling properties, consisting essentially of, in terms of mass %: C: 0.40% to 0.65%; Si: 1.20% to 2.80%; Mn: 0.30% to 1.20%; P: 0.020% or less; S: 0.020% or less; Cu: 0.40% or less; Ni: 0.80% or less; Cr: 0.70% or less; Ti: 0.060% to 0.140%; Al: 0.10% or less; N: 0.010% or less; and O: 0.0015% or less, and optionally: B: 0.0005% to 0.0050%, with the remainder being Fe and inevitable impurities, in which the contents in terms of mass % of the specified chemical components satisfy the following Expressions (1) to (3): X1=0.14×[Si]−0.11×[Mn]−0.05×[Cu]−0.11×[Ni]−0.03×[Cr]+0.02≦0.2   Expression (1) X2=(α−500)/β≧3.0   Expression (2) α=912−231×[C]+32×[Si]−20×[Mn]−40×[Cu]−18×[Ni]−15×[Cr] β=10̂(0.322−0.538×[C]+0.018×[Si]+1.294×[Mn]+0.693×[Cu]+0.609×[Ni]+0.847×[Cr]) X3=31×[C]+2.3×[Si]+2.3×[Mn]+1.25×[Cu]+2.68×[Ni]+3.57×[Cr]−6×[Ti]≧24.0   Expression (3).

Dependencies are inferred from the claim text.