Quality tool steel is subdivided into carbon and alloyed steels.
Carbon tool steel is produced per GOST 1435-74 .
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.
Alloyed tool steel is produced per GOST 5950-2000 .
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.
- hot-rolled rounds per GOST 2590-88 ;
- hot-rolled squares per GOST 2591-88 ;
- forged rounds and squares per GOST 1133-88 ;
- hot-rolled strips per GOST 4405-75 .
Gauge of carbon and alloyed tool steel is in the following conformity:
For more details see GOST norms & Technical Requirements section.