| 摘要 |
PROBLEM TO BE SOLVED: To provide high strength spring steel having excellent corrosion fatigue strength which has satisfactory settling resistance, and is free from the problem of ferrite decarburization. SOLUTION: The spring steel has a composition comprising, by weight, 0.38 to 0.48% C, 1.6 to 2.8% Si,≥4.0 Si/C, 0.6 to 1.2% Mn,≤0.015% P,≤0.005% S, 0.15 to 0.45% Cu, 0.05 to 0.30% Ni,≥0.20% Cu+Ni, 0.10 to 0.30% Cr and≤0.0012% O, and the balance substantially Fe. COPYRIGHT: (C)2004,JPO
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