| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength steel for induction hardening, having superior machinability and workability and excellent in static strength, bending fatigue strength, and rolling contact fatigue strength. SOLUTION: This steel has a composition consisting of, by weight, 0.45-0.80% C, 0.15-1.00% Si, 0.10-1.50% Mn, 0.10-1.00% Cr, 0.0005-0.0050% B, 0.005-0.050% Ti, 0.015-0.050% sol.Al, and the balance Fe with impurities and containing, if necessary, either or both of <=0.20% S and <=0.10% Te and also has a hardenability index satisfying (hardenability index)=1.2-1.4×C(%)-0.28×Mn(%)-0.49×Cr(%)<=0.3. By this method, high rolling contact fatigue strength and high induction hardenability can be obtained without causing deterioration in machinability and workability.
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