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Tool steel

Quality tool steel is subdivided into carbon and alloyed steels.

    Carbon tool steel is marked with the letter У, this denoting a carbon steel, and a number to indicate the carbon content in percent centesimals.

    Letters and digits in steel grade designation denote: digit – average carbon content in percent decimals, Х – chrome-doped, В – tungsten-doped, Г – manganese-doped. The amount of chrome, tungsten and manganese in steel is determined by GOST.

For more details see GOST norms & Technical Requirements section.