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Specification of RP graphite electrodes:
| Unit | Nominal Diameter(mm) | ||
250-400 | 450-600 | |||
Specific Resistance (not over) | Electrode Nipple | μΩ.m | 8.55.0 | 9.05.8 |
Bending Strength (not below) | Electrode Nipple | Mpa | 7.8 13.0 | 7.8 13.0 |
Elastic Modulus (not over) | Electrode Nipple | Gpa | 9.3 14.0 | 9.3 14.0 |
Bulk Density (not below) | Electrode Nipple | g/cm3 | 1.551.72 | 1.55 1.72 |
CTE(100-600)0C (not over) | Electrode Nipple | 10-6/0C | 2.9 2.7 | 2.9 2.7 |
Ash (not over) | Electrode Nipple | % | 0.50.5 | 0.50.5 |
Suggested Current Carrying Capacities of graphite electrodes:
| Diameter | Suggested Current-Carrying Capacities ( A ) | ||
| mm | Inch | A | A/cm2 |
| 250 | 10 | 8000-13000 | 18-25 |
| 300 | 12 | 13000-17400 | 17-24 |
| 350 | 14 | 17400-24000 | 17-24 |
| 400 | 16 | 21000-31000 | 16-24 |
| 450 | 18 | 25000-40000 | 15-24 |
| 500 | 20 | 30000-48000 | 15-24 |
Size of graphite electrode:
| Diameter | Length | |||||
| Nominal | Actual(mm) | Nominal | Tolerance | |||
| mm | inch | Low Spot | Min | Max | mm | mm |
| 1800 | Max+100Min-100 | |||||
| 250 | 10 | 248 | 251 | 256 | ||
| 300 | 12 | 299 | 302 | 307 | ||
| 350 | 14 | 349 | 352 | 357 | ||
| 400 | 16 | 400 | 403 | 409 | 1800 | |
| 450 | 18 | 451 | 454 | 460 | ||
| 500 | 20 | 502 | 505 | 511 | 1800, 2200 | |
Regular Power Graphite Electrodes: