STEEL FOR INDUCTION HARDENING, SHAPED MATERIAL OF INDUCTION HARDENING COMPONENT AND INDUCTION HARDENING COMPONENT

摘要

To provide a steel for induction hardening having excellent machinability, surface fatigue strength and bending fatigue strength.SOLUTION: A steel for induction hardening comprises, in mass%, C: 0.40-0.70%, Si: 0.15-2.10%, Mn: 0.30-1.15%, Cr: 0.01-less than 0.50%, S: 0.005-0.070%, N: 0.0020-0.0200%, Al: 0.005-0.100%, P: less than 0.050%, with the balance being Fe and impurities, its chemical composition satisfying the following formulae, and its ferrite volume fraction being 40% or less. 290C+50Si+430≥631.0. C+(1/7) Si+(1/5) Mn+(1/9) Cr+V+(1/25) Mo≤0.900. (1+0.7Si)×(1+3.3333Mn)×(1+2.16Cr)×(1+3.00Mo)×(1+1.73 V)×(1+0.365Cu)×(1+0.363 Ni)≥3.80. 9.7Mn+32.4Cr≤25.9.SELECTED DRAWING: Figure 3