24 July 2021 Ball Bearing Steel Bar
E52100 Ball Bearing Steel Bar
E52100 is a precision special bearing steel which produced by electroslag remelting(ESR ) process. It has the characteristics of high purity, high density, good carbide uniformity and better fatigue performance than ordinary bearing steel. Suitable for manufacturing military bearing products, special bearings, aero-engine bearings, precision instruments, precision spindle bearings, etc.
Chemical Composition:
| C(%) | Si(%) | Mn(%) | P(%) | S(%) | Cr(%) | Ni(%) | Cu(%) |
| 0.95-1.10 | 0.15-0.35 | 0.20-0.40 | ≦0.027 | ≦0.020 | 1.3-1.6 | ≦0.30 | ≦0.25 |
Physcial Properties:
| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Density | 7.81 g/cc | 0.282 lb/in³ | annealed |
| Mechanical Properties | Metric | English | Comments |
| Hardness, Rockwell B | 55 @Temperature 593 °C | 55 @Temperature 1100 °F | |
| Hardness, Rockwell C | 62 | 62 | quenched in oil from 150°C tempered. (after 1 hour at tempering temperature) |
| 64 | 64 | quenched in water from 150°C tempered. (after 1 hour at tempering temperature) | |
| 64 | 64 | quenched in oil | |
| 66 | 66 | quenched in water | |
 | 11 @Temperature 471 °C | 11 @Temperature 880 °F | |
| 20 @Temperature 427 °C | 20 @Temperature 800 °F | ||
| 42 @Temperature 316 °C | 42 @Temperature 600 °F | ||
| 53 @Temperature 204 °C | 53 @Temperature 400 °F | ||
| 59 @Temperature 93.3 °C | 59 @Temperature 200 °F | ||
| 61 @Temperature -17.8 °C | 61 @Temperature 0.000 °F | ||
| Hardness, Vickers | 100 @Temperature 588 °C | 100 @Temperature 1090 °F | |
| 140 @Temperature 538 °C | 140 @Temperature 1000 °F | ||
| 250 @Temperature 427 °C | 250 @Temperature 800 °F | ||
| 420 @Temperature 316 °C | 420 @Temperature 600 °F | ||
| 580 @Temperature 204 °C | 580 @Temperature 400 °F | ||
| 690 @Temperature 93.3 °C | 690 @Temperature 200 °F | ||
| 710 @Temperature -17.8 °C | 710 @Temperature 0.000 °F | ||
| Modulus of Elasticity | 210 GPa | 30500 ksi | |
| Bulk Modulus | 160 GPa | 23200 ksi | Typical for steels. |
| Poissons Ratio | 0.30 | 0.30 | Calculated |
| Fracture Toughness | 15.4 - 18.7 MPa-m½ | 14.0 - 17.0 ksi-in½ | cracks originating in case; case depth 0.30 to 0.35 in. |
| Machinability | 40 % | 40 % | spheroidized annealed and cold drawn. Based on 100% machinability for AISI 1212 steel. |
| Shear Modulus | 80.0 GPa | 11600 ksi | Typical for steel |
| Electrical Properties | Metric | English | Comments |
| Electrical Resistivity | 0.0000219 ohm-cm | 0.0000219 ohm-cm | Typical 5000 series steel |
| Thermal Properties | Metric | English | Comments |
| CTE, linear | 11.9 µm/m-°C @Temperature 23.0 - 280 °C | 6.61 µin/in-°F @Temperature 73.4 - 536 °F | annealed |
| 12.5 µm/m-°C @Temperature 23.0 - 280 °C | 6.94 µin/in-°F @Temperature 73.4 - 536 °F | hardened | |
| Specific Heat Capacity | 0.475 J/g-°C | 0.114 BTU/lb-°F | Typical 5000 series steel |
| Thermal Conductivity | 46.6 W/m-K | 323 BTU-in/hr-ft²-°F | Typical steel |
| Component Elements Properties | Metric | English | Comments |
| Carbon, C | 0.98 - 1.1 % | 0.98 - 1.1 % | |
| Chromium, Cr | 1.3 - 1.6 % | 1.3 - 1.6 % | |
| Iron, Fe | 96.5 - 97.32 % | 96.5 - 97.32 % | As remainder |
| Manganese, Mn | 0.25 - 0.45 % | 0.25 - 0.45 % | |
| Phosphorus, P | <= 0.025 % | <= 0.025 % | |
| Silicon, Si | 0.15 - 0.30 % | 0.15 - 0.30 % | |
| Sulfur, S | <= 0.025 % | <= 0.025 % | |