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Alloy Steel Round Bar 52100 SUJ2 Diameter 300mm To Produce Bearing
Alloy Steel 52100, as known as AISI 52100, contains a high level of carbon and chromium. This alloy offers users good machinability, as well as forming through conventional methods. The hardening of Alloy Steel 52100 can be achieved by cold working, heating, and quenching. The automotive and aircraft industry use Alloy Steel 52100 for a number of different applications including:
To be sold as Alloy Steel 52100 must contain specific amounts of certain chemicals. This list includes:
2. Relevant Steel Specification of ASTM 52100 Bearing Steel
| Country | USA | German | Japan | British |
| Standard | ASTM A295 | DIN 17230 | JIS G4805 | BS 970 |
| Grades | 52100 | 100Cr6/1.3505 | SUJ2 | 535A99/EN31 |
3. Chemical Composition of 52100 Bearing Steel and Equivalents
| Standard | Grade | C | Mn | P | S | Si | Ni | Cr | Cu | Mo |
| ASTM A295 | 52100 | 0.93-1.05 | 0.25-0.45 | 0.025 | 0.015 | 0.15-0.35 | 0.25 | 1.35-1.60 | 0.30 | 0.10 |
| DIN 17230 | 100Cr6/1.3505 | 0.90-1.05 | 0.25-0.45 | 0.030 | 0.025 | 0.15-0.35 | 0.30 | 1.35-1.65 | 0.30 | – |
| JIS G4805 | SUJ2 | 0.95-1.10 | 0.50 | 0.025 | 0.025 | 0.15-0.35 | – | 1.30-1.60 | – | – |
| BS 970 | 535A99/EN31 | 0.95-1.10 | 0.40-0.70 | – | – | 0.10-0.35 | – | 1.20-1.60 | – | – |
4. Mechanical Properties of ASTM A295 52100 Bearing Steel
| Properties | Metric | Imperial |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Hardness, Brinell | – | – |
| Hardness, Knoop (converted from Rockwell C hardness) | 875 | 875 |
| Hardness, Rockwell C (quenched in oil from 150°C tempered) | 62 | 62 |
| Hardness, Rockwell C (quenched in water from 150°C tempered) | 64 | 64 |
| Hardness, Rockwell C (quenched in oil) | 64 | 64 |
| Hardness, Rockwell C (quenched in water) | 66 | 66 |
| Hardness, Vickers (converted from Rockwell C hardness) | 848 | 848 |
| Machinability (spheroidized annealed and cold drawn. Based on 100 machinability for AISI 1212 steel) | 40 | 40 |
| Properties | Metric | Imperial |
| Density | 7.81 g/cm3 | 0.282 lb/in³ |
| Melting point | 1424°C | 2595°F |
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (@ 23-280°C/73.4- 36°F, annealed) | 11.9 µm/m°C | 6.61 µin/in°F |
| Thermal conductivity (typical steel) | 46.6 W/mK | 323 BTU in/hr.ft².°F |
5. Forging of A295 52100 Bearing Steel
AISI 52100 alloy steel is forged at 927 to 1205°C, and should not be forged below 925ºC. A post-forge equalization treatment is recommended at 745ºC for 4-6 hours followed by air cooling for SAE/AISI 52100 steel.
