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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.

Harden from a temperature of 830-870°C followed by oil quenching. Hardness after quenching is 64 HRC.

Tempering between 150-180°C is not advised as tempering within this range will seriously reduce the impact value.

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