The materials generally used for axles are as follows: 1. Carbon steel: 35, 45, 50 and other high-quality carbon structural steels have high comprehensive mechanical properties and are widely used, among which 45 steel is the most widely used. In order to improve its mechanical properties, normalizing or tempering treatment should be carried out. For unimportant or less stressed shafts, carbon structural steels such as Q235 and Q275 can be used. 2. Alloy steel: Alloy steel has high mechanical properties, but it is more expensive and is mostly used for shafts with special requirements. For example, high-speed shafts using sliding bearings often use low-carbon alloy structural steels such as 20Cr and 20CrMnTi. After carburizing and quenching, the wear resistance of the journal can be improved; the rotor shaft works under high temperature, high speed and heavy load conditions, and must have good high-temperature mechanical properties. Alloy structural steels such as 40CrNi and 38CrMoAlA are often used.
