High-speed steel roll ring manufacturers: What are the commonly used high-speed steels?
High-performance high-speed steel, by adjusting the basic chemical composition and adding other alloying elements, can be used to cut high-strength steel, high-temperature alloys, titanium alloys and other difficult-to-machine materials, improving its performance compared to ordinary high-speed steel. The main types are:
High-speed steel roll ring manufacturers: High-carbon high-speed steel
The mass fraction of high-speed steel is increased to 0.9%-1.05%, allowing the alloying elements in the steel to form carbides, thereby increasing the steel's hardness, wear resistance, and heat resistance. However, its strength and toughness are slightly reduced.
High-speed steel roll ring manufacturers: High-vanadium high-speed steel
The mass fraction of vanadium in high-vanadium high-speed steel is increased to 3%-5%. Due to the increase in vanadium carbide, the wear resistance of the steel is improved, and it is generally used for cutting high-strength steel. However, this steel is more difficult to sharpen than ordinary high-speed steel.
High-speed steel roll ring manufacturers: Cobalt high-speed steel
Cobalt high-speed steel is a type of high-speed steel containing cobalt, which can improve the high-temperature hardness and oxidation resistance of high-speed steel. Therefore, the cutting speed can be increased. The most widely used brand is M42, which has good comprehensive performance, high hardness, and good grindability. It can be used for cutting high-temperature alloys, stainless steel, and other refractory materials.
High-speed steel roll ring manufacturers: Aluminum high-speed steel
Aluminum high-speed steel is a new type of steel. Adding a small amount of aluminum to high-speed steel can improve the steel's heat resistance and wear resistance, and can also prevent the decrease in strength and toughness caused by high carbon. The performance of aluminum high-speed steel is close to that of the foreign cobalt high-speed steel M42, but the price is much cheaper. However, aluminum high-speed steel has a narrow quenching temperature range and a serious tendency towards oxidation and decarburization, so the heat treatment process must be strictly controlled.
High-speed steel roll ring manufacturers: Advantages and disadvantages of high-speed steel
High-speed steel: is a high-carbon, high-alloy steel. According to its chemical composition, it can be divided into tungsten steel and molybdenum steel; according to its cutting performance, it can be divided into ordinary high-speed steel and high-performance high-speed steel. High-speed steel should be strengthened through heat treatment. In the quenched state, the iron, chromium, part of the tungsten, and carbon in the high-speed steel form extremely hard carbides, which can improve the wear resistance of the steel (hardness can reach HRC 64-68). Another part of the tungsten dissolves in the matrix, increasing the red hardness of the steel.
The red hardness of high-speed steel can reach 650 degrees.
High-speed steel has good strength and toughness, a sharp cutting edge after sharpening, stable quality, and is generally used to manufacture small and complex-shaped tools.
Cemented carbide: is a powder of micrometer-sized refractory, high-hardness metal carbides, made of cobalt, molybdenum, nickel, etc., used as a binder and sintered at high temperature and high pressure. The content of high-temperature carbides in cemented carbide exceeds that of high-speed steel, with high hardness (HRC 75-80) 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, and low resistance to impact and vibration.