What materials used for the slewing bearing of the crane is the best?

At present, the mainstream selection for slewing bearings is: ensure safety, and secondly to pursue economics, Safety is mainly reflected in the selection of materials, which means that the selected materials should meet the requirements for the performance. After analysis force of the slewing bearing and we found that the slewing bearing was subjected to a high fatigue contact load. At the same time, fatigue is inevitable due to the relative motion of different contacts. Therefore, to ensure the safety of use, the material used for the slewing bearing must have good fatigue contact resistance and wear resistance. The economy is mainly reflected in the following two points:

1. Materials should have sufficient guarantee and the price should reasonable;
2. The material should have good processing and manufacturing properties, especially good harden ability, proper harden ability and high tempering stability.

At present, the slewing ring is made of 50Mn, 42CrMo, 45MnV, 50MnV, 5CrMnMo or other materials with the same properties. Among them, 50Mn and 42CrMo are most commonly used. The rolling elements are mainly made of GCr15 or GCr15SiMn due to less material and more stringent material performance requirements.