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Help CenterDIN 17230 Material 100Cr6 Chrome Bearing Seamless Steel Tube
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1. Relevant Steel Specification of 100Cr6 Bearing Steel
| Country | USA | German | Japan | British |
| Standard | ASTM A295 | DIN 17230 | JIS G4805 | BS 970 |
| Grades | 52100 | 100Cr6/1.3505 | SUJ2 | 535A99/EN31 |
2. Chemical Composition of 100Cr6 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 | – | – |
3. Mechanical Properties of DIN 100Cr6 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 |
- 100Cr6 Steel Physical Properties
| Properties | Metric | Imperial |
| Density | 7.81 g/cm3 | 0.282 lb/in³ |
| Melting point | 1424°C | 2595°F |
- DIN 100Cr6 Alloy Steel Thermal Properties
| 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 |
4. Forging of DIN 100Cr6 Bearing Steel
DIN 100Cr6 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.
5. Heat Treatment for DIN 100Cr6 Bearing Steel
DIN 100Cr6 alloy bearing steel is heated at 816°C followed by quenching in oil. Before performing this process, it is subjected to normalizing heat treatment at 872°C followed by slowly cooling in order to reduce the machining stress.
Hot Working
DIN 100Cr6 bearing steels alloy can be hot worked at 205 to 538°C.
Cold Working
DIN 100Cr6 bearing steel can be cold worked using conventional techniques in the annealed or normalized conditions.
Annealing
For spheroidize anneale, the following isothermal anneal is recommended:
- 1500ºF (815ºC) for 3 hours
- 1350ºF (735ºC) for 4 hours
- 1250ºF (675ºC) for 3 hours
- Slow cool to 1000ºF (540ºC) then air cool.
Quenching
DIN 100Cr6 alloy bearing steel could be hardened by quenching in water from 801-829 degree or quench in oil from 816-842 degree.
Tempering
Temper to desired hardness as indicated by tempering curves after water or oil quench.
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Alloy Seamless Tube: ASME SA-335 (P5, P9, P11, P22 P91) A213 -T22/T12 etc.
Hollow seamless bar :AISI 4130 ,ASTM 4140 etc.
Carbon steel pipe :ASTM A106 Gr.B
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Hollow section :S235JR, S275JR, S355JR, P265GH, P355N
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