Through to observing the section microstructure, and according to Fe-W-Mo-Cr-V-C the high-speed steel Fe-C micro dual phase diagram, the reason of vacuum gas quenching the high-speed steel melting accident was analyzed.

W18Cr4V steel was heat-treated by vacuum gas quenching and conventional oil quenching respectively.

Service conditions,Processes of vacuum gas quenching and vacuum tempering as well as vacuum stress relief annealing processes realized respectively before quenching and during service as well as after repair welding for the die-casting die parts of 4Cr5MoSiV1 steel were discribed.

Describes the experience in making of brake-valves for double-room vacuum gas quenching furnace especially the working principle of its sealings,function transmission and the technological processes of its key components(valve body,linkage and valve plate),with a force analysis made to the linkage in detail.

Based on the M1 key injection process research and quality control, implementation of cleaner production verification, inspection of its stabilities, industrialization of the M1 injection has been achieved, specific studies are as follows:1) Study of the key process of M1 sodium injection preparation.