There are three important reasons for the cracking of bearing steel balls

1. The bearing steel ball splits during the entire process of application after being installed inside the rolling self-aligning roller bearing, and the direction of cracking is in the direction of cold rolling of the raw material.

2. There are obvious loose and miscellaneous bands in the center of the bearing steel ball, with strip shaped cementite exceeding the standard and abnormal elements such as oxygen, calcium, magnesium found on the surface. In addition, the deep layer of the mixed zone is about 0.25mm, which establishes that there is shrinkage residue at the center of the bearing steel ball, which is a defect in the steel industry. This is also an important reason for the cracking of the bearing steel ball during the entire process of use.

3. The overheating of the quenching heat treatment structure of bearing steel balls causes their ductility to expand, reduces their compressive strength, and makes bearing steel balls more prone to cracking.