The commonly used steels for making construction machinery gears are quenched and tempered steel, hardened steel, carburized and hardened steel and nitrided steel. The strength of cast steel gear is slightly lower than that of forged steel gear, and it is often used for large-scale gears ,gray cast iron has poor mechanical properties and can be used in light-load open gear transmission, ductile iron can partially replace steel to make gears.
In the future, construction machinery gears are developing in the direction of heavy load, high speed, high precision and excellent efficiency, and strive to be small in size, light in weight, long in life and economical reliability.
