Alloy tool steel mainly includes alloy cutting tool steel, alloy die steel and alloy measuring tool steel.
Alloy cutting tool steel is a steel with a small amount of alloying elements added on the basis of carbon tool steel. For example: 9SiCr steel plate has high hardenability and tempering stability and is suitable for making low-speed cutting tools with thin blades. CrWMn steel plate has high hardness and wear resistance, and is mainly used to make more precise low-speed tools . W18Cr4V steel plate has high thermal hardness, high wear resistance and sufficient strength, and is often used to manufacture tools with high cutting speeds and forming tools with complex shapes and large loads.
Alloy die steel mainly includes cold work die steel and hot work die steel. Cold work die steel has high hardness and wear resistance, and has certain toughness and fatigue resistance. Cold work die steel is mainly used to make molds where metal deforms in cold state, and it has to withstand great pressure, bending force and impact load during work, such as NAK55 and so on.
Hot work die steel has high thermal strength，thermal hardness, high temperature abrasion resistance and high oxidation resistance, high thermal fatigue resistance and thermal conductivity. Hot work die steel is mainly used to make molds that make metals formed at high temperatures, such as HDM5 and so on.
Alloy measuring tool steel generally requires high hardness, high wear resistance, high dimensional stability and sufficient toughness for its working parts. There is no special steel grade for manufacturing measuring tools, which are usually made of carbon tool steel, rolling bearing steel and alloy tool steel, such as T10A, 60Mn, 40cr13, etc.
