 
Current Carrying Capacity and Current Density of Graphite Electrodes
Nominal diameter,
mm
| Regular Power
| High Power
| Ultra High Power
| Current carrying capacity, kA
| Current density, A/cm2
| Current carrying capacity, kA
| Current density, A/cm2
| Current carrying capacity, kA
| Current density, A/cm2
| 75
| 1-1.4
| 22-31
| -
| -
| -
| -
| 100
| 1.5-2.4
| 19-30
| -
| -
| -
| -
| 130
| 2.2-3.4
| 17-26
| -
| -
| -
| -
| 150
| 3-4.5
| 16-25
| -
| -
| -
| -
| 200
| 5-6.9
| 15-21
| -
| -
| -
| -
| 250
| 7-10
| 14-20
| -
| -
| -
| -
| 300
| 10-13
| 14-18
| 13-17.4
| 17-24
| -
| -
| 350
| 13.5-18
| 14-18
| 17.4-24
| 17-24
| -
| -
| 400
| 18-23.5
| 14-18
| 21-31
| 16-24
| 25-40
| 19-30
| 450
| 22-27
| 13-17
| 25-40
| 15-24
| 32-45
| 19-27
| 500
| 25-32
| 13-16
| 30-48
| 15-24
| 38-55
| 18-27
| 550
| 30-42
| 13-18
| 44-58
| 18-24
| 48-66
| 20-28
| 600
| 40-53
| 14-19
| 52-67
| 18-24
| 55-76
| 19-27
|
Material Properties of Graphite Electrodes
Property
| Regular Power
(RP grade) | High Power
(HP grade) | Ultra High Power
(UHP grade) | Ordinary
electrodes | Impregnated electrodes | Nominal diameter, mm
| 75-130
| 150-200
| 250-350
| 400-500
| 150-500
| 300-500
| 400-600
| Electric Resistivity,
mOhm´m
| Max.
| Electrode
| 8.5
| 9.0
| 9.0
| 9.0
| 8
| 7
| 6.5
| Nipple
| 8.5
| 8.5
| 8.5
| 8.5
| 7
| 6.5
| 5.5
| Bending
Strength,
MPa
| Min.
| Electrode
| 9.8
| 9.8
| 7.8
| 6.4
| 9.8
| 9.8
| 10.0
| Nipple
| 12.7
| 12.7
| 12.7
| 12.7
| 14.0
| 14.0
| 15.0
| Elastic Modulus,
GPa
| Max.
| Electrode
| 9.3
| 9.3
| 9.3
| 9.3
| 12.0
| 12.0
| 14.0
| Nipple
| 13.7
| 13.7
| 13.7
| 13.7
| 14.0
| 14.0
| 15.0
| Bulk density,
g/cm3
| Min.
| Electrode
| 1.58
| 1.52
| 1.52
| 1.52
| 1.60
| 1.62
| 1.65
| Nipple
| 1.63
| 1.63
| 1.68
| 1.68
| 1.70
| 1.7
| 1.7
| Ash content, %
| Max.
| Both
| 0.5
| 0.5
| 0.5
| 0.5
| 0.3
| 0.3
| 0.3
| C.T.E.
100-600 °C
| Max.
| Electrode
| 2.9
| 2.9
| 2.9
| 2.9
| 2.2
| 2.2
| 1.4
| Nipple
| 3.0
| 3.0
| 3.2
| 3.2
| 2.4
| 2.4
| 1.6
|
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