The contact stress in rolling bearing is usually between 2000MPA and 4000MPa. The ring and rolling body material must have the following characteristics: high contact fatigue strength, high hardness, high purity, good wear resistance, good structure stability and good machining performance. We mainly use the following materials:

（1）High carbon chromium bearing steel

GCrl5, GCr15SiMn, GCr15SiMo, GCr18Mo

（2）Carburized bearing steel

G20Cr2Ni4, G20CrMo, G20CrNiMo, G20CrNi2Mo, G10CrNi3Mo, G20Cr2Mn2Mo

（3）Stainless bearing steel

9Cr18, 9Cr18Mo

（4）High temperature bearing steel

Cr4Mo4V, Cr15Mo4, W9Cr4V2Mo, W18Cr4V, W6Mo5Cr4V2