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Bearing Steels
HG 3505 (DIN 100Cr6, GCr15, E52100, SUJ2)
1) Chemical Composition and its permissible allowance as per DIN EN ISO4957: %
| C | Mn | Si | P | S | Cr |
| 0.95-1.05 | 0.25-0.45 | 0.15-0.35 | ≤0.025 | ≤0.025 | 1.40-1.64 |
| +/-0.03 | +/-0.04 | +/-0.03 | +/-0.005 | +/-0.005 | +/-0.07 |
2) Application
Principal applications are those for bearings in rotating machinery. Balls, rollers and rings for roller bearings, diameter up to 30 mm.
3) Size range
| Hot rolled, mm | Forged, mm | Tolerance | |
| Round | Dia6-Dia90 XRL | Dia80-Dia503X RL | EN10060 for hot rolled; DIN7527/6 for forged black; En10278 H9 or H11 for peeled round; +3mm/-0 for forged turned |
| Flat & block | 6-90X60-805XRL | 90-450X90-610XRL | EN10058 for hot rolled; +5mm/-0 in thickness and +15/-0 in width for forged black; +3mm/-0 in thickness and +10/-0 in width for forged black for Forged milled |
4) Forging
Preheat carefully, then raise temperature to 920-1200°C for forging. Do not forge below 950°C.
5) Heat treatment
Soft Annealing
Heat to 760-800°C, cool slowly in furnace. This will produce a maximum Brinell hardness of 207.
Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 650°C, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening
Harden from a temperature of 830-870°C followed by oil quenching. Hardness after quenching is 64 HRC.
Tempering
Tempering between 150-180°C is not advised as tempering within this range will seriously reduce the impact value.