Cermet has high room temperature hardness, high temperature hardness and good wear resistance, strong oxidation resistance and good chemical stability. The materials of cermet tools mainly include TiC-based cemented carbide (TiC+Ni or Mo) with high wear resistance, high-toughness TiC-based cemented carbide (TiC+TaC+WC), tough TiN-based cemented carbide and High strength and toughness TiCN-based cemented carbide (TiCN + NbC), etc. The tools made of these alloys can process steel and alloy steel at high speed in the range of υc=300m/min～500m/min, and finish machining cast iron. Cermets can be made into drills, milling cutters and hobs. For example, the cermet hob developed by Japan, υc=600m/min, is about 10-20 times that of the cemented carbide hob, and the machined surface roughness value Rmax is 2μm.