Experiment results show that removing the surface broken crystal layer of the cold drawn rod can prevent heat treatment induced cracks. 实验结果表明，热处理前去掉冷拉棒表面的碎晶层可以防止它在热处理过程中产生裂纹。
Proper addition of oxygen during the tufftriding and nitriding can accelerate the process of chemical heat-treatment. 在软氮化和氮化时添加适量的氧能加速化学热处理过程。
