Tool steel for cold work

Chemical composition of tool steel for cold work

Explaining more accurately - Chrome affects the depth of hardening, hardness and abrasion resistance, Vanadium - prevents the growth of particles in the structure and supports the formation of carbides, Tungsten - is also responsible for increasing the abrasion resistance and gives the material a machining ability. Tool steels for cold work are used at temperatures of around 200 ℃ and carbon ranges in grades are in the range of 0.40-2.20%.

From Cr-W-Si low carbon grades and other low carbon steel grades, it is expected to have increased ductility, soft core and hard surface are expected, which is used for impact loads.

The chemical composition of tool steels is conducive to the presence of dispersion alloy carbide such as MC, MC, M₇C₃, M₃C, M₄C₃, M₂C, M₂₃C₆, and M₆C w in their structure, which affect the hardness of the materials.

Due to the structure of steel, we distinguish hypereutectoid steels, hypoeutectoid steels, and ledeburitic steel. By dividing them on the basis of the chemical composition, we can name - high-carbon low-allow tool steels, high-alloy tool steels, medium-carbon steels, and high-chromium medium-carbon steels.

The heat treatment is too large to uniformly lay down, but the main assumption is that the tool steel is applied to the martensite structure without grain growth at tempering temperatures in oil or water in the range of 720-1020 ℃ and tempering in the range of 150-450 ℃.