White of the United States.miniature deep groove ball bearing steel with high hardness, high wear resistance and high heat resistance, also known as high speed tool steel or front steel. General-purpose high-speed steel: mainly used to manufacture cutting tools (such as drills, taps, saw blades) and precision tools (such as hobs, gear shapers, and broaches) for metal materials with a cutting hardness of HB≦300.
The commonly used steel grades are W18Cr4V ﹑ W6Mo5Cr4V2 etc. According to different purposes, high-speed steel can be divided into general purpose and special purpose. Special purpose high-speed steel: Including cobalt high-speed steel and super-hard high-speed steel (hardness HRC68～70), which are mainly used to make tools for cutting difficult-to-machine metals (such as high-temperature alloys, titanium alloys, and high-strength steels). and M. General-purpose high-speed steel: mainly used to manufacture cutting tools (such as drills, taps, saw blades) and precision tools (such as hobs, gear shapers, and broaches) for metal materials with a cutting hardness of HB≦300. Commonly used steel grades are W12Cr4V5Co5, W2Mo9Cr4VCo8, etc. Commonly used steel grades are W12Cr4V5Co5, W2Mo9Cr4VCo8, etc.
In order to increase the service life of high-speed steel tools, the surface can be strengthened, such as low-temperature cyanidation, nitriding, sulfur and nitrogen co-infiltration, etc. Increasing the quenching temperature can increase the red hardness of steel. High-speed steel was created in 1898 by Taylor, F.
Containing more alloying elements, the total amount can reach 10-25%. One way to measure the red hardness is to first heat the steel to 580～650℃, keep it warm for 1 hour, then cool it, and then measure its hardness after repeated 4 times. Its advantage is to avoid the segregation of carbides caused by the smelting method to cause mechanical properties and heat treatment deformation.65%. The quenching temperature of high-speed steel is generally close to the melting point of steel, such as 1210～1240℃ for tungsten high-speed steel and 1180～1210℃ for high-molybdenum high-speed steel. Type High-speed steel is a complex steel with carbon content generally between 0.
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