SHANGHAI UNITE STEEL
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20MnCr5/1.7147/1.7149/20MC/5120/20MnCr5 Hot Rolled Steel Bar , High Strength Alloy Roun Bar
1.Specification:
Dia:10-350mm
Length:as your request.
2.All Grades Comparison:
| DIN 17210 | Material No. | AFNOR | SAE | UNI 7846 |
|---|---|---|---|---|
| 20MnCr5 | 1.7147/1.7149 | 20MC | 5120 | 20MnC |
3.Chemical Composition(%)
| C | Mn | Si | P | S | Cr |
|---|---|---|---|---|---|
| 0.17–0.22 | 1.10–1.40 | 0.40 max | 0.035 max | 0.035 max | 1.00–1.30 |
4.Mechanical Properties( T=20°C if not differently stated )
| Heat treatment state | Diameter(mm) | Rm (Mpa) |
|---|---|---|
| QUENCHED AND TEMPERED | 16 max | 1200 min |
| QUENCHED AND TEMPERED | 16-40 | 1000 min |
| QUENCHED AND TEMPERED | 40-100 | 800 min |
| - | TEMPERATURE ° C | Cooling Medium |
|---|---|---|
| Forging or hot rolling | 850-1100 | air |
| Normalizing | 840-870 | air |
| Soft Annealing | 650-700 | furnace 217HB max |
| Carburising | 880-980 | / |
| Core hardening | 860-900 | oil |
| Intermediate annealing | 650-700 | / |
| Case hardening | 780-820 | oil |
| Tempering | 150-200 | / |
