High-speed steel hardening temperatures generally close to the melting point of steel, such as tungsten high speed steel for the 1210 ~ 1240 ℃, high-molybdenum high speed steel for the 1180 ~ 1210 ℃. After quenching generally need between 540 ~ 560 ℃ tempering 3 times. Improve the quenching temperature can increase the red hardness of steel. In order to improve high-speed steel tool life can be enhanced to its surface treatment, such as low temperature nitride cyanide and other sulfur and nitrogen permeation. With high wear resistance and high hardness, high-heat resistance of tool steel, also known as high-speed tool steel or steel front. High-speed steel is the United States Taylor, FW and M. White was created in 1898.High-speed steel process performance, with good strength and toughness, so mainly used to manufacture complex Boren and impact resistance of the metal cutting tools, but also high-temperature bearings and cold extrusion dies and so on. In addition to using high-speed steel produced by melting method, the 1960s and later appeared in powder metallurgy high speed steel, it has the advantage of avoiding the melting caused by the production of carbide segregation performance degradation caused by mechanical deformation and heat treatment.
Types of high-speed steel is a complex of steel, carbon content is generally between 0.70 ~ 1.65%.  According to the different alloying elements contained can be divided into: Tungsten High Speed Steel (tungsten-9 ~ 18%); Tungsten molybdenum high speed steel (5 ~ 12% of tungsten, molybdenum 2-6%); high molybdenum high speed steel ( 0 to 2% tungsten, molybdenum 5 ~ 10%); vanadium high speed steel, according to the amount of vanadium is generally divided into different vanadium content (1-2% vanadium) and high vanadium content (2.5 to 5 vanadium %) of high-speed steel; cobalt high speed steel (cobalt 5 ~ 10%). By use of different high-speed steel can be divided into general-purpose and special purpose two. General-purpose high-speed steel: mainly used in the manufacture of cutting hardness HB ≦ 300 of the metal cutting tools (such as the tap drill saw blade) and precision tools (such as hob broach shaper cutters), commonly used in steel have W18Cr4V ﹑ W6Mo5Cr4V2 and so on. Special-purpose high-speed steel: including cobalt high speed steel and super-hard high-speed steel (hardness HRC68 ~ 70), mainly used in the manufacture of cutting difficult to machine metals (such as high temperature and high strength steel alloys such as titanium) tool, used with steel W12Cr4V5Co5 ﹑ W2Mo9Cr4VCo8 and so on.
Performance with high-speed steel cutting tools, in addition to its high hardness, high-wear resistance and sufficient toughness, there is an important factor is a red hard. Red hardness is high-speed cutting tool, the blade red hot state in the ability to resist softening. A measure of red hardness of steel is first heated to 580 ~ 650 ℃, heat 1 hour, then cooled, so that repeated 4 times to measure the hardness value.
High-speed steel hardening temperatures generally close to the melting point of steel, such as tungsten high speed steel for the 1210 ~ 1240 ℃, high-molybdenum high speed steel for the 1180 ~ 1210 ℃. After quenching generally need between 540 ~ 560 ℃ tempering 3 times. Improve the quenching temperature can increase the red hardness of steel. In order to improve high-speed steel tool life can be enhanced to its surface treatment, such as low temperature nitride cyanide and other sulfur and nitrogen permeation.