| 摘要 |
PROBLEM TO BE SOLVED: To provide steel for a spring in which embrittlement caused by hydrogen infiltrating therein is securely prevented, and which has improved corrosion fatigue resistance. SOLUTION: The steel for a spring comprising C, Si and Mn has a composition containing, by mass, 0.04 to 0.095% Ti and one or more kinds of metals selected from≤0.3% (exclusive of 0%) V,≤0.3% (exclusive of 0%) Nb,≤0.3% (exclusive of 0%) Zr,≤0.3% (exclusive of 0%) Hf by 0.05 to 0.6% in total, in which the content of Cr is suppressed to≤0.3% (inclusive of 0%), and also satisfying the inequality (1): Cr≤0.35×ä1-Exp(-25×A-0.6)}, wherein A=[Ti]×([Ti]+[V]+[Nb]+[Zr]+[Hf])×100, and [ ] denotes the content (mass%) of each element. COPYRIGHT: (C)2005,JPO&NCIPI
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