High-speed steel: It is a high-carbon high-alloy steel. It can be divided into tungsten-based or molybdenum-based steel according to chemical composition. It is divided into ordinary high-speed steel and high-performance high-speed steel according to cutting performance. High speed steel must be strengthened by heat treatment. In the quenched state, iron, chromium, part of tungsten and high carbon in the high-speed steel form extremely hard carbides, which can improve the wear resistance of the steel (hardness up to HRC64--68). Another part of the tungsten is dissolved in the matrix to increase the red hardness of the steel.

High-speed steel red hardness can reach 650 degrees.

High-speed steel has good strength and toughness. After sharpening, the cutting edge is sharp and the quality is stable. It is generally used to manufacture small and complex tools.

Cemented carbide: It is a powder of micron-sized refractory high-hardness metal carbide. It is made of cobalt, molybdenum, nickel, etc. as a binder and fired under high temperature and high pressure. The high-temperature carbide content of cemented carbide exceeds that of high-speed steel, and the hardness is high (HRC75--80), and the wear resistance is good.

Carbide red hardness can reach 800-1000 degrees.

Carbide cutting speed is 4-7 times higher than high speed steel. High cutting efficiency.

The disadvantages are low bending strength, poor impact toughness, high brittleness, and low impact and vibration resistance.