High-speed tool steel 
 High-speed tool steel is mainly used to manufacture high-efficiency cutting tools. Because of its high red hardness, wear resistance, high strength characteristics, but also for the manufacture of high performance requirements of the mold, roll, high temperature bearings and high temperature springs 
 High-speed tool steel 
 And so on. High-speed tool steel after heat treatment than the use of hardness up to HRC63, at about 600 ℃ work temperature and still maintain a high hardness, and its toughness, wear resistance and heat resistance are good. High-speed tool steel annealed state the main alloying elements tungsten, molybdenum, chromium, vanadium, and some high-speed tool steel added cobalt, aluminum and other elements. These are high-carbon high-alloy steel ledeburite steel, its main feature of the organization is rich in carbon. Cast high-speed tool steel in the eutectic carbide is a carbide, broken by heat stress after processing into granular distributed in the steel, as a carbide; martensite from austenite and carbide precipitation in the matrix that for the secondary carbides. The carbide tool steel for high-speed performance of great impact, especially in the secondary carbides, its steel austenitic grain size and the performance of secondary hardening, etc. have a great impact. Carbon number, type and chemical composition of steel, and carbide particle size and distribution are concerned with the deformation of steel. Tungsten, molybdenum high-speed tool steel is the main alloying elements, secondary hardening of steel and other properties play an important role. Chromium on steel hardenability, wear resistance and oxidation resistance plays an important role in the secondary hardening also has a role. Vanadium on secondary hardening and wear resistance of steel play an important role, but can reduce the grinding performance.