Compared with HP and RP electrodes, UHP graphite electrodes have more advantages as follows:
*Lower electrical resistivity, the lower the resistivity, the better the conductivity and consumption
*Heat tolerance and oxidation resistance, reducing physical and chemical loss in practice, especially at high temperature in practice.
*Smaller coefficient of thermal expansion,the lower the coefficient, the stronger the thermal stability of the product and the higher the oxidation resistance.
*Low ash content, which will get oxidation resistance improved much.
| Properties | Position | Unit | UHP | |
| 300-600mm | 650-800mm | |||
| Specific Resistance | Body | μΩm | 4.8-5.8 | 4.6-5.8 |
| Nipple | 3.8-4.5 | 3.8-4.5 | ||
| Bending Strengh | Body | Mpa | 10.0-14.0 | 10.0-14.0 |
| Nipple | 20.0-26.0 | 20.0-26.0 | ||
| Young's Modulus | Body | Gpa | 9.0-13.0 | 10.0-14.0 |
| Nipple | 15.0-18.0 | 15.0-18.0 | ||
| Bulk Density | Body | g/cm3 | 1.68-1.74 | 1.70-1.74 |
| Nipple | 1.77-1.82 | 1.78-1.84 | ||
| CTE(100-600°C) | Body | ×10 -6/ﾟC | 1.1-1.4 | 1.1-1.4 |
| Nipple | 0.9-1.2 | 0.9-1.2 |
For the purpose of reducing electrode consumption and improving production efficiency, we should make furnace capacity, transformer capacity and graphite electrode match with each other in a reasonable proportion, the following chart shows the relation among them for your reference.
|
Furnace |
Graphite Electrode Diameter(mm) |
Graphite Electrode Diameter(mm) |
|||
|
Capacity(t) |
Diameter(m) |
RP |
HP |
UHP |
|
|
10 |
3.35 |
5 |
7.5 |
10 |
300/350 |
|
15 |
3.65 |
6 |
10 |
12 |
350 |
|
20 |
3.95 |
7.5 |
12 |
15 |
350/400 |
|
25 |
4.3 |
10 |
15 |
18 |
400 |
|
30 |
4.6 |
12 |
18 |
22 |
400/450 |
|
40 |
4.9 |
15 |
22 |
27 |
450 |
|
50 |
5.2 |
18 |
25 |
30 |
450 |
|
60 |
5.5 |
20 |
27 |
35 |
500 |
|
70 |
6.8 |
22 |
30 |
40 |
500 |
|
80 |
6.1 |
25 |
35 |
45 |
500 |
|
100 |
6.4 |
27 |
40 |
50 |
500 |
|
120 |
6.7 |
30 |
45 |
60 |
550/600 |
|
150 |
7 |
35 |
50 |
70 |
600 |
|
170 |
7.3 |
/ |
60 |
80 |
600 |
|
200 |
7.6 |
/ |
70 |
100 |
600/700 |
|
250 |
8.2 |
/ |
/ |
120 |
700 |
|
300 |
8.8 |
/ |
/ |
150 |
700 |
◆ Low electrical resistance * DC electric arc furnace.
◆ High conductivity * AC electric arc furnace.
◆ Strong chemical stability * Submerged arc furnace.
◆ High resistance to oxidation and thermal shock * Ladle furnace.
◆ High machining accuracy, good surface finishing
Manufacturing process
Graphite electrode production is a complicted process, usually it have to get through calcinations, kneading, forming, baking, graphitizing and machining, finally to be finished products, shipped to customers after careful package.
