| 摘要 |
PURPOSE:To produce a gear excellent in impact fatigue resistance. CONSTITUTION:A steel having a composition consisting of, by weight, 0.10-0.30% C, <=0.15% Si, <=0.60% Mn, <=0.90% Cr, 0.30-2.00% Mo, 0.010-0.100% Nb, and the balance Fe with inevitable impurities or a steel which has a composition further containing, other than the above components, one or more kinds among six components consisting of <=1.00% Cu, <=3.50% Ni, 0.010-0.100% Al, 0.010-0.100% Ti, 0.01-0.30% V, and 0.0003-0.0050% B and having the balance Fe with inevitable impurities is carburized, heated up to 750-850 deg.C by means of high-frequency induction heating, held at a temp. in this range for 0.1-2.0min, and then forged into a gear, followed by quench-and-temper treatment. |
