The main components of cemented carbide are carbides and binders. The carbides are mainly WC, TiC, TaC, NbC, VC, etc. The binder is mainly cobalt (Co). Compared with tool steel, cemented carbide has higher hardness (up to 87 ~ 91HRA), good hot hardness (good abrasion resistance at about 1000 ℃). When used as a tool, the cutting speed is 4-7 times higher than that of high-speed steel, and the service life is increased by 5 ~ 8 times. Its disadvantages are that the hardness is too high, the brittleness is difficult to be machined. Therefore, it is often made into blades and inlaid on the tool holder. Cemented carbide is mainly used for machining tools; various molds, including drawing Extending die, drawing die, cold heading die; mining tools, geology and petroleum development use a variety of drill bits, etc.