Steel U8A for tools operating under conditions without heating of cutting edge. Foreign analogue C80U.
up to 100mm
Tool carbon steel-steel with a carbon content of 0.7% or more. This steel is characterized by high hardness and strength (after final heat treatment) and is used for the manufacture of tools. Produced according to GOST 1435-99 in the following grades: u7; U8; U8G; U9; U10; 11; U12; U7A; U8A; U8GA; U9A; U10A; У11А; U12A. The standard applies to carbon tool steel hot-rolled, forged, calibrated steel, Serebrianka.
Tool carbon steel is divided into high quality and high quality. The content of sulfur and phosphorus in high — quality tool steel — 0.03% and 0.035 %, high-quality-0.02% and 0.03%, respectively. To the group of high-quality steels are steel grades without the letter A (at the end of the marking), the group of high-quality steel with low sulfur and phosphorus and harmful impurities of other elements of the brand began with the letter A. The letters and figures in the designation of these grades of steel mean: Y — carbon, the following figure — the average carbon content in tenths of a percent, Y — high manganese content, and — high quality.
The advantage of carbon tool steel consists mainly in their low cost and relatively high hardness compared with other tool steels. The disadvantages include low wear resistance and low heat resistance — when heating the cutting edge of the tool above 250-300 °C quenching occurs with loss of hardness.
Available in the form of round bars, square and hexagonal cross-section, coils of wire, sheets, strips.