Products Introduce About the size of railway wheel set is mainly determined by the size of the wheel pressure, wheel pressure increased, wheel diameter increased. The material of railway wheel set, for mechanical driving speeds greater than 30m/min, medium and intermediate working types, it is recommended to use cast steel not lower than ZG55, and surface quenching (flame quenching or induction hardening), the hardness is not lower than HB320- 350, quenching depth of not less than 5mm, for human-driven or mechanically driven light-work type, speed less than 30m/min, railway wheel set, surface hardness HB180-240. Products Features 1. Treatment: The heat treatment is quenching or hardening and tempering. 2. Size: Special designs are available, all can customized according to clients' demand. Precise measurement and surface finishes are available. 3. Inspection: All items are checked and tested thoroughly during every working procedure and after the product is finally manufactured to ensure that best quality product goes out in the market.