The bearing industry uses different materials for the production of the various bearing components. The materials are processed to achieve desirable properties to maximize bearing performance and life.Generally rolling mill bearing parts are made of high-carbon chromium steel. The parts are martensite quenched when they carry less or no impact load. Bainite quenching should be used when parts carry high impact load. The parts are not only made of carburizing steel but also according carburzation and carbonitridion if they will carry high impact load.

Class	Steel No.	Application
Carburizing Bearing Steel	G20CrMo / G20CrNiMo	Small and medium-size bearings carry impact load
	G20CrNi2Mo / G10CrNi3Mo	Medium and large size bearing carry high impact load
	G20Cr2Ni4	Extra large size bearing carry high impact load
High Carbon Chromium Bearing Steel	Gcr15	Small and medium-size bearings carry less or no impact load
	GCr15SiMn	Large size bearing on mill rolling, no impact load
	GCr18Mo	According bainite quenching, the bearing used in mill rolling can carry certain impact load and sustain high temperture