High-speed steel: It is high-carbon and high-alloy steel. According to chemical composition, it can be divided into tungsten series and molybdenum series steel. According to cutting performance, it can be divided into ordinary high speed steel and high performance high speed steel. High-speed steel must be strengthened by heat treatment. In the quenched state, the iron, chromium, part of tungsten and carbon in the high-speed steel form extremely hard carbides, which can improve the wear resistance of the steel (hardness can reach HRC64-68). The other part of tungsten is dissolved in the matrix, increasing the red hardness of high-speed steel to 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, complex-shaped tools.
Cemented carbide: It is a micron-order refractory high-hardness metal carbide powder, which is made by firing at high temperature and high pressure with cobalt, molybdenum, nickel, etc. as a binder. The content of high-temperature carbides in cemented carbide exceeds that of high-speed steel, with high hardness (HRC75-80) and good wear resistance.
The red hardness of cemented carbide can reach 800-1000 degrees.
The cutting speed of cemented carbide is 4-7 times higher than that of high-speed steel. High cutting efficiency.
The disadvantages are low bending strength, poor impact toughness, high brittleness, low impact resistance and low vibration resistance.
热门资讯
