Electrodes


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