According toSprocketsGear requirements: If the impact is small case small can be surface carburizing, nitriding and other technologies! So that the surface hardness is higher, while the base hardness is lower, good wear resistance, and not easy to fracture. If the impact load is large, due to the tempering treatment, that is, high-temperature tempering.
45# steel quenching temperature at about 580 degrees, holding time has a formula, depending on your equipment, the size of the workpiece, shape, and then quenching, and then with a temperature of about 500-600 high-temperature tempering, air-cooling, and then in the heating 200 degrees air-cooling, this step is mainly to eliminate stress, after the precision of the gears rely on him to ensure that, and then in Finishing up!
Gear steel is a generic term for the steel that can be used to process and manufacture gears. Generally there are low carbon steel such as 20# steel, low carbon alloy steel such as: 20Cr, 20CrMnTi, etc., medium carbon steel: 35# steel, 45# steel, etc., medium carbon alloy steel: 40Cr, 42CrMo, 35CrMo, etc., can be called gear steel.
This type of steel usually has good strength, hardness, and toughness after heat treatment according to the requirements of use, or the surface is wear-resistant and the heart has good toughness and impact resistance.