What is the difference between high speed tool steel and carbide tool?
High-speed steel cutters have excellent strength and toughness, while Carbide tool are superior with higher hardness and red hardness (ability to maintain hardness at high cutting temperatures). In general, the cutting speed of a solid carbide tool can be at least 4 times higher than that of a HSS tool, and the tool life is longer. However, compared to high-speed steel tools, carbide tools have poor fracture toughness, which limits their application in certain processing areas (especially tapping).
High-speed tool steels are mainly used to make high-efficiency cutting tools. Due to its high red hardness, good wear resistance, and high strength, it is also used to manufacture molds, rolls, high-temperature bearings, and high-temperature springs that require high performance. The hardness of the high-speed tool steel after heat treatment can reach HRC63 or more, and the hardness can be maintained at a working temperature of about 600°C, and the toughness, wear resistance and heat resistance are good. The main alloying elements of the annealed high-speed tool steel are tungsten, molybdenum, chromium, vanadium, and some high-speed tool steels include cobalt, aluminum and other elements. This type of steel is a high-carbon, high-alloy, leaded steel. One of its main organizational characteristics is the presence of large amounts of carbides. The carbides in the as-cast high-speed tool steel are eutectic carbides, which are broken into granules and distributed in the steel after the hot press processing. These carbides are called primary carbides; the carbides precipitated from the austenite and martensite matrix are called For secondary carbides. These carbides have a great influence on the properties of high-speed tool steels, especially secondary carbides, which have a great influence on the austenite grain size and secondary hardening properties of the steel. The quantity and type of carbides are related to the chemical composition of the steel, while the grain size and distribution of the carbides are related to the amount of deformation of the steel. Tungsten and molybdenum are the main alloying elements of high-speed tool steels and play an important role in the secondary hardening of steel and other properties. Chromium plays an important role in the hardenability, oxidation resistance and wear resistance of steel, and also has a certain effect on secondary hardening. Vanadium plays an important role in the secondary hardening and wear resistance of the steel, but reduces the grinding performance.
The advantages of cemented carbide
Carbide has a high hardness, strength, wear resistance and corrosion resistance, known as "industrial teeth" for the manufacture of tools, knives, cobalt and wear parts, widely used in military, aerospace, machining , Metallurgy, oil drilling, mining tools, electronic communications, construction and other fields, with the development of the downstream industry, the demand for the carbide market continues to increase. In the future, the manufacture of high-tech weaponry, cutting-edge scientific and technological advances, and the rapid development of nuclear energy will greatly increase the demand for high-tech, high-quality and stable hard alloy products.