Ark® Electrodes

Since 1984 Superior Graphite has been the leading producer of small diameter graphite electrodes. Our Russellville, Arkansas USA facility specializes in the production of 200 mm – 400 mm (8” - 16”) diameter high power (HP) and ultra-high power (UHP) ARK electrodes, offered in 3 TPI, 4 TPI, and male / female joining systems. Specializing in the small diameter market enables Superior Graphite to focus our years of experience of graphite manufacturing knowledge toward our customer’s applications: primary melting, ladle metallurgy, and specialty furnace applications worldwide.

Superior Graphite utilizes unique, continuous in-line graphitization furnaces allowing us to assure consistent, uniform properties throughout the entire electrode. This uniformity results in the lower consumption and enhanced performance required by our demanding customers.

ARK electrodes are machined to exact dimensions and tolerances following NEMA, JIS, or IEC industrial standards. Once machined, ARK electrodes are packaged and shipped to our customers’ doorsteps throughout the world.

  

Electrode Nominal Size & Weight

Grade – HP
NOMINAL SIZE
3 TPI
4 TPI
M / F
in.
mm
lbs.
kgs.
lbs.
kgs.
lbs.
kgs.
8 x 48
200 x 1200
-
-
135
61
-
-
8 x 60
200 x 1500
-
-
175
79
165
75
8 x 72
200 x 1800
-
-
215
98
205
93
9 x 60
225 x 1500
225
102
-
-
-
-
9 x 72
225 x 1800
270
123
-
-
260
118
10 x 60
250 x 1500
280
127
280
127
270
123
10 x 72
250 x 1800
335
152
330
150
320
145
12 x 60
300 x 1500
400
181
400
181
-
-
12 x 72
300 x 1800
485
220
485
220
-
-
14 x 60
350 x 1500
525
238
525
238
-
-
14 x 72
350 x 1800
650
295
650
295
-
-
14 x 84
350 x 2100
750
340
-
-
-
-
16 x 60
400 x 1500
-
-
-
-
-
-
16 x 72
400 x 1800
-
-
-
-
-
-
16 x 84
400 x 2100
-
-
-
-
-
-
16 x 96
400 x 2400
-
-
-
-
-
-
Grade – UHP-LCD & UHP-HCD
NOMINAL SIZE
3 TPI
4 TPI
M / F
in.
mm
lbs.
kgs.
lbs.
kgs.
lbs.
kgs.
8 x 48
200 x 1200
-
-
150
68
140
64
8 x 60
200 x 1500
-
-
190
86
180
82
8 x 72
200 x 1800
-
-
225
102
215
98
9 x 60
225 x 1500
235
107
235
107
-
-
9 x 72
225 x 1800
280
127
280
127
270
123
10 x 60
250 x 1500
285
129
285
129
275
125
10 x 72
250 x 1800
350
160
350
160
340
154
12 x 60
300 x 1500
420
191
420
191
-
-
12 x 72
300 x 1800
505
229
505
229
-
-
14 x 60
350 x 1500
565
256
565
256
-
-
14 x 72
350 x 1800
675
306
675
306
-
-
14 x 84
350 x 2100
775
352
775
352
-
-
16 x 60
400 x 1500
715
324
715
324
-
-
16 x 72
400 x 1800
880
399
880
399
-
-
16 x 84
400 x 2100
1000
454
1000
454
-
-
16 x 96
400 x 2400
1200
544
1200
544
-
-

Electrode Joining Systems

3 TPI TAPERED CONNECTING PIN
Nominal Diameter of Electrode
Diameter (Maximum)
Length (Maximum)
Average Weight of Pin
Industrial Standard
in.
mm
in.
mm
in.
mm
lbs.
kgs.
9
225
5.500
139.70
8.000
203.20
9.0
4.0
NEMA
JIS
IEC
10
250
5.500
139.70
8.000
203.20
9.0
4.0
NEMA
-
-
10
250
6.125
155.58
8.667
220.13
12.0
5.5
NEMA
JIS
IEC
12
300
6.125
155.58
8.667
220.13
12.0
5.5
NEMA
-
-
12
300
6.975
177.17
10.667
270.93
19.0
8.6
NEMA
JIS
IEC
14
350
6.975
177.17
10.667
270.93
19.0
8.6
NEMA
-
-
14
350
8.500
215.90
12.000
304.80
32.1
14.6
NEMA
JIS
IEC
16
400
8.500
215.90
12.000
304.80
32.1
14.6
NEMA
-
-
16
400
9.500
241.30
13.375
339.73
44.8
20.3
-
-
IEC
16
400
9.500
241.30
14.000
355.60
47.0
21.3
NEMA
JIS
IEC
4 TPI TAPERED CONNECTING PIN
Nominal Diameter of Electrode
Diameter (Maximum)
Length (Maximum)
Average Weight of Pin
Industrial Standard
in.
mm
in.
mm
in.
mm
lbs.
kgs.
8
200
4.813
122.24
7.000
177.80
5.9
2.7
NEMA
JIS
IEC
9
225
5.500
139.70
7.000
177.80
7.8
3.5
-
-
IEC
9
225
5.500
139.70
8.000
203.20
9.0
4.1
-
JIS
-
10
250
6.000
152.40
7.500
190.50
10.5
4.8
-
-
IEC
12
300
7.000
177.80
8.500
215.90
16.2
7.4
-
-
IEC
14
350
8.000
203.20
10.000
254.00
25.0
11.4
-
-
IEC
14
350
8.000
203.20
12.000
304.80
32.1
14.6
-
-
IEC
14,16
350,400
8.750
222.25
14.000
355.60
40.0
18.2
-
-
IEC
16
400
8.750
222.25
12.000
304.80
47.0
21.3
-
-
IEC
MALE / FEMALE JOINT
Nominal Diameter of Electrode
Diameter (Maximum)
Length (Maximum)
Industrial Standard
in.
mm
in.
mm
in.
mm
8
200
4.688
119.06
4.813
122.24
NEMA
-
IEC
9
225
5.188
131.76
5.313
134.94
NEMA
-
IEC
10
250
5.688
144.46
5.813
147.64
NEMA
-
 IEC

Typical Properties

PROPERTY
UNITS
UHP-HCD
UHP-LCD
HP
Pins
Apparent Density
Grams/cm3
1.70 - 1.77
1.69 - 1.75
1.66 - 1.72
1.77 - 1.82
Specific Electrical Resistance (longitudinal)
Micro-ohm - meters
5.0 – 6.1
5.2 – 6.8
6.8 – 8.9
3.6 – 5.6
Flexural Strength (4 - point loading)
Kg/cm2
90 - 170
90 - 170
60 - 140
180 - 270
Coefficient of Thermal Expansion (PATE)
X 10 –6/°C at 25 to 100°C
0.3 – 0.6
0.6 – 0.9
0.3 – 1.1
0.1 – 0.4

The values listed above are typical for the corresponding grade. They should not be considered a specification or a guarantee.

Recommended Current Carrying Capacities

Nomical Diameter - mm (inches)
Peak Secondary Current (KA)
EAF Melting Surface
Ladle Metallurgy Furnace
HP
UHP-LCD
UHP-HCD
HP
UHP-LCD
UHP-HCD
200 (8)
up to 7
5 to 9
7 to 14
up to 8
6 to 10
8 to 15
225 (9)
up to 9
6 to 12
9 to 16
up to 10
7 to 13
10 to 17
250 (10)
up to 11
7 to 14
11 to 18
up to 13
9 to 16
13 to 20
300 (12)
up to 15
9 to 20
15 to 29
up to 18
12 to 23
18 to 32
350 (14)
up to 22
14 to 28
22 to 37
up to 25
17 to 31
25 to 40
400 (16)
up to 28
22 to 36
32 to 46
up to 32
26 to 40
36 to 50

ARK UHP and HP grades are available for all applications, including EAF melting, ladle metallurgy, vacuum de-gassing and other specialized arc furnace applications. The secondary current ranges listed above are for reference only and results may vary depending on other operating conditions. Superior Graphite recommends a review from our technical service staff prior to grade selection to ensure the optimum performance.

 

Recommended Tightening Torque

DIAMETER
TORQUE
 
ft. – lbs.
kg – m
N - M
8" (200 mm)
180
25
250
9" (225 mm)
260
35
350
10" (250 mm)
330
45
450
12" (300 mm)
480
65
650
14" (350 mm)
630
85
850
16" (400 mm)
810
110
1100

Proper Handling Guide
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