Technical specifications for SMB bearing steels

(a) Chemical composition of bearing steel

	Spec	C %	Si %	Mn %	P %	S %	Cr %	Mo %	Ni	Hardness
Chrome Steel	SAE52100 100Cr6 SUJ2	0.95 ~ 1.10	0.15-0.35	0.50 max	0.025 max	0.025 max	1.30 ~ 1.60			64 HRC max
Stainless Steel	AISI440C SUS440C X105CrMo17	0.95 ~ 1.20	1.00 max	1.00 max	0.04 max	0.03 max	16.0 ~18.0	0.75 max		58 HRC max
	KS440 ACD34 X65Cr13	0.60 ~ 0.75	1.00 max	1.00 max	0.03 max	0.02 max	11.5 ~13.0	0.3 max		60 HRC max
	AISI420 SUS420 X20Cr13	0.26 ~ 0.35	1.00 max	1.50 max	0.04 max	0.03 max	12.0 ~14.0			55 HRC max
	AISI304 SUS304 X5CrNi1810	0.08 max	0.75 max	2.00 max	0.045 max	0.03 max	18.0 ~20.0		8.0 ~ 10.5	39 HRC max
	AISI316 SUS316 X5CrNiMo17-12-2	0.08 max	1.00 max	2.00 max	0.045 max	0.03 max	16.0 ~18.0	2.0 ~ 3.0	10.0 ~14.0	39 HRC max

(b) Steel grades for EZO Japan bearings

Bearing Material Tables