Roller bearings with thickness up to 50 mm.
Medium alloy, oil-hardening tooling steel, which is hard-wearing.
DIN 17230-1980 Ball and Roller Bearing Steels
|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 to 760-800oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 217.
Normalizing temperature: 860-900oC.
Stress relieving to remove machining stresses should be carried out by heating to approx. 650oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Harden from a temperature of 830-890oC followed by oil quenching. Hardness after quenching is approx. 64 HRC.
Tempering temperature: 150-180oC.
Hot forming temperature: 1100-850oC.