本文通过20CrMo钢的渗碳渗硼再淬火复合处理,讨论了渗层的硬度分布和耐磨性能;对渗层的接触疲劳性能进行了对比试验.试验表明,经过渗碳渗硼的复合处理,接触疲劳寿命有显著提高,为牙轮钻头渗碳渗硼新工艺提供了机械性能方面的重要依据.用上述工艺试制了一批牙轮钻头,现场试验表明,钻头使用寿命可提高40～60%. In this paper, through the carburizing and boronizing re-quenching composite treatment of 20CrMo steel, the hardness distribution and wear resistance of the infiltration layer are discussed, and the contact fatigue performance of the infiltration layer is compared.Experiments show that after carburizing and boronizing compound treatment, Contact fatigue life has been significantly improved, which provides an important basis for the mechanical properties of the new technology of carburizing and boronizing cone bit.A batch of roller cone bits were trial-produced by the above process, and field tests show that the service life of the bit can be increased by 40-60% .