34CrNiMo6

34CrNiMo6 is an alloy steel belonging to the group of nickel-chromium-molybdenum steels. It is a high-strength, high-toughness steel commonly used in the manufacture of heavy machine parts, such as gears, shafts and axles.

The designation "34CrNiMo6" indicates that this steel contains approximately 0.34 % carbon, 1 % chromium, 0.25 % molybdenum, 1.5 % nickel and small amounts of other elements such as silicon and manganese. The addition of nickel and molybdenum gives 34CrNiMo6 its high strength and toughness, while the carbon content provides good wear resistance and machinability. This steel is usually supplied in a quenched and tempered condition, which means it is heat treated to improve its properties. This heat treatment process involves heating the steel to a high temperature, followed by cooling in oil or water, and then tempering at a lower temperature to reduce brittleness and improve toughness. 34CrNiMo6 is known for its excellent mechanical properties, including high tensile strength, high yield strength and good fatigue resistance. It is also known for its good weldability, making it suitable for use in welded structures.

All in all, 34CrNiMo6 is a case-hardening steel with very good hardenability and high tensile strength properties that is often used for high-stress components.