Date: 2013-08-06

Bearing material properties chart

Items	Units	Bearing Steel	Stainless Steel	Ceramic Si3N4	Ceramic ZrO2	Ceramic Al 2O3
Density	g/cm3	7.85	7.90	3.20~3.30	6.00	3.95
Coefficient of linear expansion	10-6/ K	10.0	11.0	3.2	10.5	8.5
Youngs Modulus	GPa	208	200	300~320	210	380
Poissons ratio	--	0.30	0.30	0.26	0.30	0.22
Hardness	Hv10HRc	700 62	66	1500~1800 75~80	1200 70	1800 80
Bending strength	MPa	2400	--	800~1000	950~1200	300~500
Fracture toughness	MPam-1/2	25	--	6.0~7.0	10.0	3~4
Thermal conductivity	W/mk	30~40	15	35	2~3	30
Special electrical resistance	Omm2/m	0.1~1	0.75	1018	1015	1018
Heat resistance	C	120	300	800	--	--
Corrosion resistance	--	Low	Medium	High	High	High
Stress cycles(50% failed)	--	1007	--	1007	1005	nbsp;
Nonlubrication friction	--	High	High	Low	--	--
Magnetism	--	magnetic	magnetic	non- magnetic	non- magnetic	non- magnetic
Centrifugal force	--	Very high	Very high	Very low	High	medium
Operate temperature increasing	--	high	high	low	--	--
Size stability	--	Low	Low	High	High	High
Conductivity	--	conductor	conductor	insulator	insulator	insulator

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Product Model	Inside Diameter	Outside Diameter	Thickness
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