Wuxi Xingye Group Steel Co., Ltd

Applications
Roller bearings with thickness up to 50 mm. 

Description
Medium alloy, oil-hardening tooling steel, which is hard-wearing.

Quality Standard:

DIN 17230-1980 Ball and Roller Bearing Steels

Chemical Composition(%)

C	Si	Mn	P	S	Cr	Ni	Cu
0.90-1.05	0.50-0.70	1.00-1.20	0.030 max	0.025 max	1.40-1.65	0.30 max	0.30 max

HEAT TREATMENT:

Soft Annealing
Heat to 760-800^oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 217.

Normalizing
Normalizing temperature: 860-900^oC.

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to approx. 650^oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Hardening
Harden from a temperature of 830-890^oC followed by oil quenching. Hardness after quenching is approx. 64 HRC.

Tempering
Tempering temperature: 150-180^oC.

Forging
Hot forming temperature: 1100-850^oC.