Foreign tap material is M35 (ie W6Mo5Cr4V2Co5) or GV3, M3 (ie W6Mo5Cr4V3) and other high-performance high-speed steel and powder high-speed steel containing cobalt or high vanadium, and China's current tap is still the traditional process of ordinary high-speed steel M2 (ie W6Mo5Cr4V2) Mainly

The quenching and tempering hardness, red hardness, flexural strength and cutting performance of M3, M2 and M35 steel were compared. The results show that the quenching and tempering hardness and red hardness of M3 steel and M35 steel are significantly higher than those of M2 steel, and the quenching and tempering hardness and hardness of M3 steel and M35 steel are not significantly different. The bending strength of M2 steel is higher than that of M3 steel and M35 steel. In 1160 ~ 1180 ℃ quenching, M3 steel and M35 steel bending strength difference is very small, in 1180 ~ 1240 ℃ quenching, M3 steel bending strength is less than M35 steel; above 1220 ℃ quenching, three kinds of material bending strength are sharp decline. Used for tap, M2 steel and M35 steel quenching temperature range than M3 steel width; M3 steel wire cutting performance is higher than M2 steel and M35 steel; with M3 steel toughness and grinding performance improvement, M3 steel is expected to become a new tap Special high speed steel.