High-speed steel is the main material for manufacturing various cutting tools (or molds) and is currently widely used. When a machined tool is working, due to friction, the temperature of the part where the tool is used will inevitably increase. For example, when the cutting speed of the tool is 10-20M/min, the temperature of the blade is 200-320℃. When the turning speed is 50-80M/min, the blade temperature is 500-600°C. As the processing object changes, in some special cases, the blade will reach 670℃, and even the temperature of some warm extrusion mold parts will reach 700℃. This requires our cutting tools (or tools and moulds) to use corresponding reasonable tool materials, which should have high hardness, high strength, high wear resistance, high red hardness and certain toughness necessary for tool materials. In order to meet the above requirements, the heat treatment of high-speed steel must be strictly controlled from annealing to quenching. According to the service conditions of various tools, the heat treatment process parameters must be reasonably selected to achieve the most ideal performance and minimum deformation. For some tools with special requirements, the surface hardness and wear resistance must be improved by chemical heat treatment.