We use the national standard No. 45 steel for the wheel axle of the electric track bullet train. This steel is a kind of carbon structural steel. It is steel that is frequently used by foundry manufacturers when processing large castings. Compared with other steels, No. 45 steel has higher hardness than carburized and quenched steel, and the deformation after heat treatment is small, so it can be widely used in the processing of steel castings. The use of No. 45 steel to produce large steel castings can ensure the plasticity, toughness, and wear resistance of castings, improve the quality of steel castings, make castings obtain good mechanical properties in subsequent use, and prolong the service life of steel castings. Reduce scrap rate.