| 摘要 |
PROBLEM TO BE SOLVED: To provide steel for a cold-formed spring in which high strength and toughness and the characteristic of corrosion-resistant fatigue strength are satisfied, and cold formability and quench crack resistance are enhanced. SOLUTION: The steel for the cold-formed spring consists mainly of Fe, and contains, by mass,≥0.36% and≤0.46% C,≥1.8% and≤2.6% Si,≥0.2% and≤1.2% Mn,≤0.015% P,≤0.01% S,≥0.1% and≤0.5% Cu,≥0.1% and≤1.5% Ni,≥0.05% and≤1% Cr, and≥0.002% and≤0.012% N. In the steel for the cold-formed spring, WC + WMn + WCr is≥1.2% and≤2%, WSi/3 + WCr/2 + WMn is≥1.4% and≤2.1%, and WCu + WNi is≥0.4%, where WC is C content, WMn is Mn content, WCr is Cr content, WSi is Si content, WNi is Ni content. COPYRIGHT: (C)2004,JPO&NCIPI
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