用W6Mo5Cr4V2钢做50Mn钢链条片推刀出现早期崩刃,对脆断原因进行了失效分析。碳化物偏聚是失效的主要原因。改用LM1,LM2新型模具钢,对其锻造、热处理、表面强化技术进行了探索。解决了推刀早期失效问题,推刀使用寿命提高了32～34倍,取得了显著的经济效益。 Use W6Mo5Cr4V2 steel to do 50Mn steel chain blade push knife early collapse, the cause of brittle fracture failure analysis. Carbide segregation is the main reason for failure. Switch to LM1, LM2 new die steel, forging, heat treatment, surface hardening technology was explored. The utility model solves the problem of early failure of a push knife, increases the service life of a push knife by 32 to 34 times and achieves remarkable economic benefits.