大直径锻造耐磨钢球的热处理工艺

采用二次加热淬火和低温回火工艺改善?120 mm锻造耐磨钢球的使用性能,研究了二次加热淬火工艺中不同升温速率和淬火冷却时间对钢球硬度分布、冲击性能和显微组织的影响.得出钢球的最佳热处理工艺为:以2.8℃/min的速率升温至840℃并保温1 h,出炉空冷至800℃后淬入35℃水中冷却350～400 s,然后出水空冷至80...

Heat treatment process of large diameter forged wear-resistant steel ball

Secondary heating quenching and low temperature tempering processes were used to improve the performance of120 mm forged wear-resistant steel balls,and the effects of heating rates and cooling time in secondary heating quenching process on the hardness distribution,impact property and microstructure of the steel balls were studied.The optimized heat treatment process of the steel ball is as follows:heating to 840℃with the rate of 2.8℃/min and holding for 1 h,air cooling to 800℃,quenching into 35℃water for 350-400 s,and then air cooling to below 80℃;tempering at 200℃for 4 h,furnace cooling to below 80℃,and then air cooling.After treating by the optimized process,the hardness from surface to core of the wear-resistant steel ball is all in the range of 58-60 HRC,the impact absorbed energy at core of the ball at room temperature is≥15 J,and the number of single falling test is more than 5000 times,which proves that this process can improve the quality and life of large-diameter forged wear-resistant steel balls.