In the steel industry, the use of bearings is harsh. In addition to being subjected to fine iron powder, moisture, and high temperature, it must withstand high loads, shock loads, strong vibrations, and periodic rapid acceleration and rapid deceleration. It is generally required to have long bearing life and reliability. High in order to meet the needs of customers, Delk has been committed to the development of bearing materials and bearing structures, thereby improving the working life and reliability of bearings.