What materials need to be prepared when making bearings

The ferrules and rolling bodies of needle slide bearings bear high contact pressure repeatedly while making rolling contact with sliding. The retainer is in sliding contact with both sides of the ferrule and the tumbling body, or one side thereof, and bears the tensile force and the compressive force. Therefore, the material, performance, and main requirements for bearing rings, rolling bodies and cages are as follows.
　　The required performance of ferrule and rolling body material:
　　 high rolling fatigue strength 　 high hardness 　 high abrasion resistance required performance of cage material:
　　 Good dimensional stability, high mechanical strength, and good workability. Depending on the application, there are also requirements for good impact resistance, heat resistance, and corrosion resistance.
　　 Material of ferrule and rolling body:
　　 Ferrules and rolling bodies usually use high carbon chromium bearing steel. Most of the bearings use SUJ2 in JIS steel grade. SUJ3 is used for large bearings.
　　 The chemical composition of SUJ2 has been standardized as a bearing material in various countries around the world. For example: AISL52100 (USA), DIN100Cr6 (West Germany), BS535A99 (UK), etc. are all of the same kind of steel.
　　 When further impact resistance is required, chromium steel, chromium-molybdenum steel, nickel-chromium-molybdenum steel, and carburizing and quenching are used as bearing materials to make the steel have a hardened layer from the surface to the appropriate depth. Carburized bearings with proper hardening depth, fine structure, proper hardness of surface and core hardness, have better impact resistance than bearings using bearing steel, and the chemical composition of general carburized bearing steel.
　　Sanjia bearings are vacuum degassed, so the materials used have high cleanliness, low oxygen content and good quality. Furthermore, proper heat treatment is adopted to significantly increase the life of the bearing's rolling fatigue.
　　In addition to the above-mentioned steel grades, high-speed steel with excellent heat resistance and stainless steel with good corrosion resistance are also used for special applications.
　　 Cage material:
　　The material of the stamping cage is low-carbon steel. Depending on the application, brass plates and stainless steel plates are also used. The material for cutting the cage is made of high-strength brass, carbon steel, and synthetic resin.