In considering the material ball bearing the main consideration one point: the purity of steel
Ball Bearing in normal operating conditions, when the raceway surface spalling 6mm2, we say that a bearing failure, this time bearing operation is its fatigue life. Mainly because of falling off the production of bearing steel that exist within the non-metallic inclusions. Work in the bearing, non-metallic inclusions in steel can cause internal stress concentration, resulting in weak points, with the bearing running day after day, these weak spots slowly develop into fine cracks, and finally lead to flaking roller. Therefore, the purity of bearing steel is essential, steel particles inside the smaller the size of inclusions, the less the number of particles, the probability of the smaller cracks, the higher the fatigue life of bearings.
With modern smelting technology, world-class brands bearing the purity of bearing steel manufacturers have reached this point a very high standard. Apart from the standard in compliance with ISO and ABMA bearing materials, will be cleaner than the material of steel to do to improve deep groove ball bearing reliability under high loads. Take mine in the truck wheel bearing applications, the bearing load of the power is very high. To 200 tons deadweight, for example, after the vehicle loaded with 350 tons or so, one side rear wheel bearing the force of 120 tons. So if the bearing material selection criteria, and its size will be very large. In order to minimize the wheel size, make the design more compact, this position often used in high-purity materials, precision bearings. Even so, there are 500mm diameter bearing about.
