Abstract: Effects of different spheroidizing processes on mechanical properties of 16MnCrS5 steel for cold forging gear were studied, and the effects of four spheroidizing processes on hardness, strength and elongation of the 16MnCrS5 gear steel were analyzed. The experimental results show that holding at 760 ℃ for 4 h, cooling to 710 ℃ at a rate of 12 ℃/h and holding for 3 h, then cooling to 680 ℃ at a rate of 12 ℃/h and holding for 2 h, and furnace cooling to 500 ℃, with this process, the hardness of the material reaches the minimum 123 HBW, the elongation reaches 39%, and the reduction of area exceeds 70%, which can meet the high plasticity requirements of the cold forging materials, and can provide a process reference for the heat treatment of 16MnCrS5 steel for cold forging gear.

Key words: 16MnCrS5 steel, spheroidizing, hardness, cold forging