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  • Product name: Graphite electrode
  • Product Number: 005
  • Added time: 2010-05-06
  • Views : 557

 

Applications
● Electrodes in electric arc furnace and ladle refining furnace for steel making;
● Electrodes in electric smelting furnace for producing industrial silicon, yellow phosphorus,
  corundum and so on.

Programmable properties
● Good electrical conductivity
● High resistance to thermal shock
● High mechanical strength

Grades
● Regular power (RP)
● Impregnated
● High power (HP)
● Super high power (SHP)
● Ultra high power (UHP)

All graphite electrodes are offered with tapered nipples, i.e. 3 or 4 threads per inch, and meet the internationally accepted tolerances as per NEMA CG 1/ IEC 60239 / JIS R7201 standards.

Typical Sizes

Diameter
Length
 
 
Nominal Diameter
Actual Diameter ( mm )

Nominal Length

Tolerance

Short Length

mm
inch
Max.
Min.
Low Spot

mm

mm

mm

75
3
78
73
72
1000
Max. +50
Min. -50
 
 
Max. -50
Min. -225
 
 
100
4
103
98
97
1200
 
130
5-1/8
132
127
126
150
6
154
149
146
1600
Max. +100
Min. -100
 
 
 
 
 
Max. -100
Min. -275
 
 
 
 
 
200
8
205
200
197
225
9
230
225
222
250
10
256
251
248
1600,1800
300
12
307
302
299
350
14
357
352
349
400
16
409
403
400
1600,1800,
2000,2200
450
18
460
454
451
500
20
511
505
502
1800,2000,
2200,2400
550
22
562
556
553
600
24
613
607
604
2000,2200,2400

 

Specifications

Item
Unit
Regular-power
Impregnated
φ75-
130
φ150-
225
φ250-
300
φ350-
500
φ75-
200
φ250-
350
φ400-
500
Specific Resistance (≤)
Electrode
μ Ω·m
8.5
9.0
9.0
9.0
8.0
8.0
8.0
Nipple
8.0
8.0
8.0
8.0
7.5
7.5
7.5
Bending Strength (≥)
 
Electrode
MPa
 
9.8
9.8
7.8
6.4
10.0
9.0
8.0
Nipple
13.0
13.0
13.0
13.0
15.0
15.0
15.0
Elastic Modulus (≤)
 
Electrode
GPa
 
9.3
9.3
9.3
9.3
12.0
12.0
12.0
Nipple
14.0
14.0
14.0
14.0
14.0
14.0
14.0
Bulk Density (≥)
 
Electrode
g/cm3
 
1.58
1.52
1.52
1.52
1.58
1.58
1.58
Nipple
1.63
1.63
1.68
1.68
1.68
1.68
1.68
C.T.E.(≤)
(100-600℃)
 
Electrode
10-6/
 
2.9
2.9
2.9
2.9
2.7
2.7
2.7
Nipple
2.7
2.7
2.8
2.8
2.5
2.5
2.5
Ash(≤)
 
%
0.5
0.5
0.5
0.5
0.3
0.3
0.3

 

Item
Unit
High-power
Super high-power
Ultra high-power
φ200-400
φ450-500
φ350-400
φ450-500
φ300-400
φ450-500
Specific Resistance(≤)
Electrode
μ Ω·m
7.0
7.5
6.5
7.0
6.2
6.5
Nipple
6.5
6.5
6.0
6.0
5.5
5.5
Bending Strength (≥)
 
Electrode
MPa
 
10.5
9.8
10.5
10.0
10.5
10.0
Nipple
15.0
15.0
16.0
16.0
16.0
16.0
Elastic Modulus (≤)
 
Electrode
GPa
 
12.0
12.0
13.0
13.0
14.0
14.0
Nipple
16.0
16.0
17.0
17.0
18.0
18.0
Bulk Density (≥)
 
Electrode
g/cm3
 
1.60
1.60
1.62
1.62
1.65
1.64
Nipple
1.70
1.70
1.71
1.71
1.72
1.72
C.T.E.(≤)
(100-600℃)
 
Electrode
10-6/
 
2.4
2.4
2.2
2.2
1.5
1.5
Nipple
2.2
2.2
1.8
1.8
1.4
1.4
Ash(≤)
 
%
0.3
0.3
0.3
0.3
0.3
0.3

 

Suggested Current-carrying Capacities of Graphite Electrodes

Nominal Diameter
Suggested Current-Carrying Capacities ( A )
mm
Inch
Regular-Power
Impregnated
High-Power
Ultra High-Power
75
3
1000-1400
1300-2000
 
 
100
4
1500-2400
1800-3000
 
 
130
5-1/8
2200-3400
2800-4200
 
 
150
6
3000-4500
4000-5000
 
 
200
8
5000-6900
4800-9000
5500-9000
 
225
9
 
 
6500-10000
 
250
10
7000-10000
8000-12000
8000-13000
 
300
12
10000-13000
11000-16000
13000-17400
15000-22000
350
14
13500-18000
15000-22000
17400-24000
20000-30000
400
16
18000-23500
20000-28000
21000-31000
25000-40000
450
18
22000-27000
24000-34000
25000-40000
32000-45000
500
20
25000-32000
28000-42000
30000-48000
38000-55000
550
22
 
 
34000-55000
45000-65000
600
24
 
 
38000-61000
50000-75000

* The operating current ranges in this table are only for AC EAF. DC EAF or LF can run at a reasonable
 higher current lever with the electrode.
** The values mentioned in this table are only for reference and not committed to any contract.

Remarks
● It is essential to select electrode carefully for each particular furnace. The primary factor is the
  maximum current intensity of the furnace. However, other conditions should also be considered,
  such as the characteristics of the furnace, type of charge, tap to tap time, oxygen blowing,
  mechanical requirement, furnace regulation, etc.
● Generally, specifications for electrodes of most grades have been standardized. Variation of
  physical characteristics with temperature, however, should be taken into account whenever using
  the electrodes.

Precautions to the use of graphite electrodes
● The capacities of the furnace and the transformer determine whether the grade and diameter of the
  electrode suitable to the furnace or not.
● In order to prevent the electrode column from being hit by the collapsed furnace loads, large and
  heavy scraps should be loaded onto the bottom of the furnace. Do not put significant quantity of
  insulating materials such as lime and so on just under the electrode column, otherwise it would be
  difficult to power on the electrode column, or even break it.

● Electrode column may be hurt when it moves up and down if the furnace cover is out of the position.
● When making a connection, lost or damaged pitch plugs must be replaced.
● The reason must be found out if a gap appears between two electrodes after connection. The
  electrode column can only be loaded after the gap being eliminated.
● The electrode column must be strictly perpendicular to the ground lever. Oblique column is not
  allowed during operation.
● The holder must be placed between the two safety marks on the top electrode, otherwise the
  column may be broken.
● Generally, different manufacturers may make their electrodes with different raw materials and
  processes, therefore the physical and chemical properties of their electrodes are usually different.
  Please do not fit electrodes and nipples made by different manufacturers together.