The selection of shaft parts materials is mainly determined according to the strength, rigidity, wear resistance and manufacturing process of the shaft, and strives to be economical and reasonable.
1. Ordinary carbon steels such as Q235 and Q255 can also be used for shafts with small or less important loads, such as our wheelie bin axles
2. Alloy steel can be used for larger forces, limited axial size and weight, or some special requirements. For example, 40Cr alloy steel can be used in medium-precision, high-speed working occasions, and the material has better comprehensive mechanical properties after quenching and tempering treatment;
3. The use of Cr15, 65Mn and other alloy steels can be used for high precision and poor working conditions. These materials have good wear resistance and fatigue strength after quenching and tempering and surface quenching;
4. For shaft parts that work under high-speed and heavy-load conditions, use low-carbon steel such as 20Cr, 20CrMnTi, 20Mn2B, or 38CrMoA1A carburized steel. These steels will not only have a high surface after carburizing and quenching or nitriding. Hardness, and its core strength is also greatly improved, so it has good wear resistance, impact toughness and fatigue strength.
5. Ductile cast iron and high-strength cast iron are often used in the manufacture of shafts with complex shapes and structures due to their good casting properties and vibration damping properties. In particular, the rare earth magnesium spheroidal graphite cast iron developed in my country has good impact resistance and toughness. It also has the advantages of friction reduction, vibration absorption, and low sensitivity to stress concentration. It has been used in the manufacture of important shaft parts for automobiles, tractors, and machine tools. .