Patent ID: 7615186

Claim:
A spring steel comprising: C: 0.5 to 0.8% by mass (hereinafter, referred to as %), Si: 1.2 to 2.5%, Mn: 0.2 to 1.5%, Cr: 1.5 to 4.0%, V: 0.5% or less including 0%, P: 0.02% or less excluding 0%, S: 0.02% or less excluding 0%, Al: 0.01% or less excluding 0%, and Fe and inevitable impurities, wherein the Si content and the Cr content satisfy the following formula (2): (0.8×[Si])+[Cr]≧3.0 (2) wherein, [Si] and [Cr] respectively represent the Si content (%) and the Cr content (%).