| 摘要 |
PROBLEM TO BE SOLVED: To provide spring steel with which a spring having hostile-environment resistance capable of sufficiently meeting the recent demand for the required characteristics under severe service environment and heavy load can be manufactured. SOLUTION: The spring steel has a composition containing 0.35-0.6% C, 1.4-2.6% Si, 0.6-1% Mn, 0.15-0.7% Cu, 0.15-1.5% Ni, <=0.25% (including 0%) Cr, 0.02-0.09% Ti and <=0.05% (including 0%) Al and satisfying inequality [Cr]<=([Cu]+[Ni])/2 (where [Cr], [Cu] and [Ni] represent respective contents (mass%) of Cr, Cu and Ni).
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