According to the data of "production and marketing demand forecast and transformation and upgrading analysis report of China's bearing manufacturing industry", the total industrial output value of China's bearing manufacturing industry increased year by year from 2009 to 2013. In 2013, the total industrial output value of the industry reached 249.363 billion yuan, a year-on-year increase of 12.92%.

Under the action of the periodic load, the contact surface of the bearing is easily damaged by fatigue, that is, cracking and spalling, which is an important damage situation of the bearing. Therefore, in order to improve the service life of bearing, bearing steel must have high contact strength.

In terms of its function, it should be a support, which is literally used to support the shaft, but it is only a part of its function. The essence of support is to be able to bear radial load. It can also be understood that it is used to fix the shaft. Bearing fast easy excellent automation selection has been included.