Different materials and heat treatments are used for bearings in different parts, such as heat treatment methods to improve the mechanical properties of 40CrMo steel at low temperatures (ambient temperature -40℃∽-30℃, bearing operating temperature around -20℃) such as impact energy, and control of the hardened layer depth, surface hardness, soft zone width and surface cracks of surface induction quenching.

The speed increaser bearing is made of steel equivalent to foreign STF and HTF steel and the optimal content of retained austenite is controlled; the spindle bearing is made of electroslag remelting carburizing steel ZG20Cr2Ni4A as the quality of domestic vacuum degassed steel is still far behind.