Heat treatment of tool steel

Tool steel is used to make cutting tools, measuring tools, molds and wear-resistant tools. Tool steel has high hardness and can keep high hardness and red hardness at high temperature, as well as high wear resistance and appropriate toughness. Tool steel is generally divided into carbon tool steel, alloy tool steel and high-speed tool steel.
The service life of tool steel is closely related to the quality of heat treatment. The heat treatment of tool steel is characterized by spheroidizing annealing in advance to obtain uniform and moderate spheroidizing structure. The final heat treatment is quenching and low-temperature tempering (high-speed steel is quenching and 560 ℃ tempering for three times) to obtain high hardness with uniform fine carbides distributed on tempered martensite matrix Degree of organization to ensure the wear resistance of tools. The heat treatment of hot forging die steel is different. The pre heat treatment is one-stage annealing, and the final heat treatment is quenching plus medium temperature tempering or high temperature tempering to obtain good comprehensive mechanical properties.