Graphite Electrode
Technical Properties of Graphite Electrodes
Items |
Unit |
NoMin..al Diameter(mm) |
Regular Power |
Impregnated Electrodes |
75-130 |
150-200 |
250-350 |
400-500 |
150-500 |
Resistivity
|
M ax.. |
Electrode
Nipple |
|
8.5 |
9.0 |
9.0 |
9.0 |
8 |
8.5 |
8.5 |
8.5 |
8.5 |
7 |
Elastic Strength
|
M in. |
Electrode
Nipple |
Mpa |
9.8 |
9.8 |
7.8 |
6.4 |
9.8 |
12.7 |
12.7 |
12.7 |
12.7 |
14.0 |
Elastic Modulus
|
M ax. |
Electrode
Nipple |
Gpa |
9.3 |
9.3 |
9.3 |
9.3 |
12.0 |
13.7 |
13.7 |
13.7 |
13.7 |
14.0 |
Bulk Density
|
M in. |
Electrode
Nipple |
G/cm 3 |
1.58 |
1.52 |
1.52 |
1.52 |
1.60 |
1.63 |
1.63 |
1.68 |
1.68 |
1.70 |
Ash |
Max. |
|
% |
0.5 |
0.5 |
0.5 |
0.5 |
0.3 |
C.T.E 100-600¡ã C
|
M ax. |
Electrode
Nipple |
m k -1
|
2.9 |
2.9 |
2.9 |
2.9 |
2.2 |
3.0 |
3.0 |
3.2 |
3.2 |
2.4 |
Technical Properties of Graphite Electrodes
Items |
Unit |
NoMin.al Diameter(mm) |
High Power |
Ultra High Power |
300-500 |
400-600 |
Resistivity
|
M ax. |
Electrode
Nipple |
|
7 |
6.5 |
6.5 |
5.5 |
Bending Strength
|
M in. |
Electrode
Nipple |
Mpa |
9.8 |
10.0 |
14.0 |
15.0 |
Elastic Modulus
|
M ax. |
Electrode
Nipple |
Gpa |
12.0 |
14.0 |
14.0 |
15.0 |
Bulk Density
|
M in. |
Electrode
Nipple |
G/cm 3 |
1.62 |
1.65 |
1.70 |
1.70 |
Ash |
Max. |
|
% |
0.3 |
0.3 |
C.T.E 100-600¡ã C
|
M ax. |
Electrode
Nipple |
m k -1
|
2.2 |
1.40 |
2.4 |
1.60 |
Specifications & Allowance of Graphite Electrodes
Diameter |
Length |
Diameter |
Actual Diameter |
Length |
Allowance mm |
inch |
mm |
Max. |
Min. |
3 |
75 |
77 |
74 |
1000 |
+50
-75 |
4 |
100 |
102 |
99 |
1200 |
5 1/8 |
130 |
131 |
128 |
6 |
150 |
154 |
151 |
1600 |
¡À 100 |
8 |
200 |
204 |
201 |
10 |
250 |
256 |
252 |
1600
1800 |
12 |
300 |
307 |
303 |
14 |
350 |
357 |
353 |
16 |
400 |
408 |
404 |
1800
2000 |
18 |
450 |
459 |
455 |
20 |
500 |
510 |
506 |
22 |
550 |
561 |
557 |
2000-2500 |
24 |
600 |
612 |
608 |
Current Carrying Capacity and Current Density of Graphite Electrodes
NoMin.al Diameter
mm |
Regular Power |
High Power |
Ultra High Power |
Current Carrying Capacity
A |
Current Density
A/cm 2 |
Current Carrying Capacity
A |
Current Density
A/cm 2 |
Current Carrying Capacity
A |
Current Density
A/cm 2 |
75 |
1000-1400 |
22-31 |
- |
- |
- |
- |
100 |
1500-2400 |
19-30 |
- |
- |
- |
- |
130 |
2200-3400 |
17-26 |
- |
- |
- |
- |
150 |
3000-4500 |
16-25 |
- |
- |
- |
- |
200 |
5000-6900 |
15-21 |
- |
- |
- |
- |
250 |
7000-10000 |
14-20 |
- |
- |
- |
- |
300 |
10000-13000 |
14-18 |
13000-17400 |
17-24 |
- |
- |
350 |
13500-18000 |
14-18 |
17400-24000 |
17-24 |
- |
- |
400 |
18000-23500 |
14-18 |
21000-31000 |
16-24 |
25000-40000 |
19-30 |
450 |
22000-27000 |
13-17 |
25000-40000 |
15-24 |
32000-45000 |
19-27 |
500 |
25000-32000 |
13-16 |
30000-48000 |
15-24 |
38000-55000 |
18-27 |
550 |
30000-42000 |
13-18 |
44000-58000 |
18-24 |
48000-66000 |
20-28 |
600 |
40000-53000 |
14-19 |
52000-67000 |
18-24 |
55000-76000 |
19-27 |
Dimensions of Tapered Nipples
|
Diameter |
Nipple mm |
Socket mm |
Pitch
mm |
inch |
mm |
D |
L |
d 2 |
l |
d 1 |
H |
|
3TPI
|
10
12
14
16
18
20
22
24 |
250
300
350
400
450
500
550
600 |
155.58
177.17
215.90
241.30
273.05
298.45
298.45
336.55 |
0
-0.50 |
220.10
270.90
304.80
338.60
355.60
372.50
372.50
457.20 |
0
-1 |
103.80
116.90
150.00
169.80
198.70
221.30
221.72
245.70 |
0
-3 |
10 |
147.14
168.73
207.47
232.87
264.62
290.02
290.02
328.11 |
+0.50 |
113.05
138.45
155.40
172.30
180.80
189.25
189.25
231.60 |
+7
0 |
8.47 |
|
Diameter |
Nipple mm |
Socket mm |
Pitch
mm |
inch |
mm |
D |
L |
d 2 |
l |
d 1 |
H |
|
4TPI
|
3
4
5 1/8
6
8
10
12
14
16
18
20
22
24 |
75
100
130
150
200
250
300
350
400
450
500
550
600 |
46.04
69.85
79.38
92.08
122.24
152.40
177.80
203.20
222.25
241.30
269.88
298.45
317.50 |
0
-0.50 |
76.20
101.60
127.00
139.70
177.80
190.50
215.90
254.00
304.80
304.80
355.60
355.60
355.60 |
0
-1 |
20.80
40.30
45.60
56.20
80.00
108.00
129.20
148.20
158.80
177.90
198.00
223.36
242.41 |
0
-3 |
6 |
39.72
63.53
73.06
85.76
115.92
146.08
171.48
196.88
215.93
234.98
263.56
292.13
311.18 |
+0.50
0 |
41.10
53.80
66.50
72.85
91.90
101.30
114.00
133.00
158.40
158.40
183.80
183.80
183.80 |
+7
0 |
6.35 |
Moment for reference for connecting nipples and electrodes
Diameter of Electrode |
Moment |
Diameter of Electrode |
Moment |
In |
mm |
ft-1bs |
kgs-m |
in |
mm |
ft-1bs |
kgs-m |
3 |
75 |
22 |
3 |
12 |
300 |
720 |
100 |
4 |
100 |
43 |
6 |
14 |
350 |
1190 |
165 |
5 |
130 |
72 |
10 |
16 |
400 |
1450 |
200 |
6 |
150 |
110 |
15 |
17 |
425 |
1660 |
230 |
7 |
175 |
160 |
22 |
18 |
450 |
1800 |
250 |
8 |
200 |
230 |
32 |
20 |
500 |
2310 |
320 |
9 |
225 |
330 |
45 |
22 |
550 |
2750 |
380 |
10 |
250 |
430 |
60 |
24 |
600 |
3110 |
430 |
Directions for use of graphite electrodes
1. When choosing diameter of the graphite electrodes for electric steel-making furnace, please refer to the current carrying capacity of the electrodes.
2. The transport and storage of the graphite electrodes must be kept away from being moistened or wetted by rain, snow and water. Be sure to dry them up before use.
3. During loading, unloading and transportation, the graphite electrodes must be handled with great care to protect the threads from being damaged by collision. in the course of loading, unloading and hoisting, it is advisable to use special hoist tools.
4. Before the electrodes are connected to the nipples, it is necessary to blow the electrode threads thoroughly clean with compressed air and screw the nipples tightly according to requirement for using moment spanner.
5. The terMinal faces or the two electrodes tightly screwconnected must be kept in close contact.
6. When the elevator of the electric arc furnace is hoisting the electrodes, no swinging so as to avoid the electrode joints being loosened and dislocated .
7. The holder devices of the electrodes should not hold the electrodes near the area of nipple sockets.
8. In order to prevent the breakage of the electrodes in case of scrap cave-ins, lift the electrodes in time according to the melting conditions dump the unmelted waste steel into the pool.
9. Charging the furnace, put the large scrap steel lumps at the bottom and the small ones at the top.
10.In order to prevent dislocation after the electrodes being jointed, we provide binding paste and pins which are easily to be applied.
For making constant improvement of our electrodes quality so as to serve our customers better, please always keep us informed of your comments and requirements. |