Bearing steels
Bearing steels are high-carbon steels designed for rolling-element bearings and other components exposed to repeated contact loading. They are characterised by high hardness, wear resistance and resistance to rolling-contact fatigue after suitable heat treatment. They are used for bearing rings, races and rolling elements where reliable operation under cyclic loads is required.
| Grade | Material no. | C | Si | P | S | Cr | Mn |
|---|---|---|---|---|---|---|---|
| SUJ3 | — | 0.95 - 1.1 | 0.4 - 0.7 | max 0.025 | max 0.025 | 0.9 - 1.2 | 0.9 - 1.15 |
| STB5 | — | 0.95 - 1.1 | 0.4 - 0.7 | max 0.025 | max 0.025 | 0.9 - 1.2 | 0.9 - 1.15 |
| STB4 | — | 0.95 - 1.1 | 0.15 - 0.35 | max 0.025 | max 0.025 | 1.3 - 1.6 | max 0.5 |
| SUJ5 | — | 0.95 - 1.1 | 0.4 - 0.7 | max 0.025 | max 0.025 | 0.9 - 1.2 | 0.9 - 1.15 |
| SUJ4 | — | 0.95 - 1.1 | 0.15 - 0.35 | max 0.025 | max 0.025 | 1.3 - 1.6 | max 0.5 |
| 100Cr2 | 1.3501 | 0,90-1,05 | 0,15-0,35 | 0,03 | 0,025 | 0,40-0,60 | 0,25-0,45 |
| 105Cr4 | 1.3503 | 1,00-1,10 | 0,15-0,35 | 0,03 | 0,025 | 0,90-1,15 | 0,25-0,40 |
| 1.3505 | 1.3505 | 0,93-1,05 | 0,15-0,35 | 0,025 | 0,015 | 1,35-1,60 | 0,25-0,45 |
| 100CrMnSi6-4 | 1.3520 | 0,93-1,05 | 0,45-0,75 | 0,025 | 0,015 | 1,40-1,65 | 1,00-1,20 |
| 100CrMo7-3 | 1.3536 | 0,93-1,05 | 0,15-0,35 | 0,025 | 0,015 | 1,65-1,95 | 0,60-0,80 |
| 100CrMnMoSi8-4-6 | 1.3539 | 0,93-1,05 | 0,40-0,60 | 0,025 | 0,015 | 1,80-2,05 | 0,80-1,10 |
| X108CrMo17 | 1.3543 | 0,95-1,20 | ≤1,00 | 0,04 | 0,015 | 16,0-18,0 | ≤1,00 |
| S44004 | 1.3544 | 0,95-1,10 | ≤1,00 | 0,025 | 0,015 | 16,0-18,0 | ≤1,00 |
| X89CrMoV18-1 | 1.3549 | 0,85-0,95 | ≤1,00 | 0,04 | 0,015 | 17,0-19,0 | ≤1,00 |
| 80MoCrV42-16 | 1.3551 | 0,77-0,85 | ≤0,40 | 0,025 | 0,015 | 3,90-4,30 | 0,15-0,35 |
| X82WMoCrV6-5-4 | 1.3553 | 0,78-0,86 | ≤0,40 | 0,025 | 0,015 | 3,90-4,30 | ≤0,40 |
| 1.3554 | 1.3554 | 0,78-0,86 | ≤0,40 | 0,015 | 0,015 | 3,80-4,50 | ≤0,40 |
Standards covering this category
23Property ranges
15| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 590 | 730 | 2 |
| Re | N/mm² | 370 | 410 | 2 |
| A5 | % | 15 | 20 | 2 |
| Z | % | 40 | 45 | 2 |
| KCU | kJ/m² | 440 | 490 | 2 |
| HB | — | 179 | 229 | 7 |
| HRC | — | 58 | 58 | 1 |
| HRB | — | 94 | 95 | 2 |
| rho | g/cm³ | 7.56 | 7.85 | 12 |
| E | GPa | 211 | 211 | 1 |
| alpha | 10^-6/K | 13.4 | 13.6 | 1 |
| Ac1 | °C | 715 | 750 | 2 |
| Ac3 | °C | 735 | 910 | 2 |
| Ar3 | °C | 710 | 710 | 1 |
| Ar1 | °C | 635 | 688 | 2 |
Derived from 12 grades in this category with a recorded value.
Composition range
13| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.77 | 1.2 | 17 |
| O | % | 0.0015 | 0.0015 | 4 |
| Al | % | 0.05 | 0.05 | 4 |
| Si | % | 0.15 | 1 | 17 |
| P | % | 0.015 | 0.04 | 17 |
| S | % | 0.015 | 0.025 | 17 |
| V | % | 0.07 | 2 | 4 |
| Cr | % | 0.4 | 19 | 17 |
| Mn | % | 0.15 | 1.2 | 17 |
| Ni | % | 0.25 | 0.5 | 5 |
| Cu | % | 0.2 | 0.3 | 10 |
| Mo | % | 0.08 | 5.2 | 14 |
| W | % | 0.25 | 6.7 | 3 |
Derived from 17 grades in this category with a recorded value.
Heat treatment
3| Operation | MinTemperature (°C) | MaxTemperature (°C) | Grades |
|---|---|---|---|
| quenching | 830 | 860 | 1 |
| annealing | — | — | 1 |
| spheroidize_annealing | — | — | 1 |