Performance: high hardness, good wear resistance, although the hardness is not as good as PCD and CBN, but much higher than carbide and high-speed steel tools. It has a long service life, reduces the number of tool changes, and greatly improves production efficiency. High temperature resistance, good heat resistance, good chemical stability, not easy to stick to the knife, and corrosion resistance. Mainly used for high-speed machining and semi-finish machining, for high-speed cutting of ordinary steel and cast iron that cannot be machined by carbide inserts, and for processing difficult-to-machine materials.