Current carrying capacity of graphite electrode
| Nomina diameter | RP | HP | UHP | ||||
| Current Carrying Capacity | Current Density | Current Carrying Capacity | Current Density | Current Carrying Capacity | Current Density | ||
| in | mm | A | A/cm2 | A | A/cm2 | A | A/cm2 |
| 12 | 300 | 10000-13000 | 14-18 | 13000-17400 | 17-24 | 15000-22000 | 20-30 |
| 14 | 350 | 13500-18000 | 14-18 | 17400-24000 | 17-24 | 20000-30000 | 20-30 |
| 16 | 400 | 18000-23500 | 14-18 | 21000-31000 | 16-24 | 25000-40000 | 19-30 |
| 18 | 450 | 22000-27000 | 13-17 | 25000-40000 | 15-24 | 32000-45000 | 19-27 |
| 20 | 500 | 25000-32000 | 13-16 | 30000-48000 | 15-24 | 38000-55000 | 18-27 |
| 22 | 550 | 32000-40000 | 13-16 | 35000-55000 | 14-22 | 42000-64000 | 17-26 |
| 24 | 600 | 35000-41000 | 13-15 | 41000-61000 | 14-21 | 50000-73000 | 17-25 |
| 28 | 700 | 39000-48000 | 10-12 | 55000-82000 | 14-21 | 67000-99000 | 17-25 |
| 32 | 800 | 43000-54000 | 8-10 | / | / | / | / |
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What are the advantages of Eaf Graphite Electrodes?
Eaf Graphite Electrodes are widely used in industrial production, metallurgy, and other industries. They are convenient to use and have a low cost, bringing significant benefits to industrial production. What other advantages do graphite electrodes have? Why are they so popular?
Faster processing speed: Under normal circumstances, the mechanical processing speed of graphite processing can be 2 to 5 times faster than that of copper; and the discharge processing speed is 2 to 3 times faster than that of copper; the material is less likely to deform: it has obvious advantages in the processing of thin rib electrodes; the softening point of copper is around 1000 degrees, which is easily deformed by heat; the sublimation temperature of graphite is 3650 degrees; the thermal expansion coefficient is only 1/30 of that of copper.
Lighter weight: the density of graphite is only 1/5 of that of copper. When large electrodes are subjected to discharge processing, it can effectively reduce the burden on machine tools (EDM): it is more suitable for application on large molds.
Less discharge consumption: Since spark oil also contains C atoms, during discharge processing, the high temperature causes the C atoms in the spark oil to be decomposed and form a protective film on the surface of the graphite electrode, compensating for the loss of the Eaf Graphite Electrodes.
No burrs: After copper electrodes are processed, they still need to be manually trimmed to remove burrs, while graphite electrodes are burr-free after processing, which saves a lot of costs and is easier to achieve automated production.
Graphite is easier to grind and polish: The cutting resistance of many graphite products is only 1/5 of that of copper, making them easier to grind and polish manually.
Lower material costs and more stable prices: Due to the rise in copper prices in recent years, the price of isotropic graphite is now lower than that of copper. Under the same volume, the price of Toyo Tanso's general graphite products is 30% to 60% lower than that of copper, and the price is more stable, with very little short-term price fluctuation. It is precisely because of this incomparable advantage that graphite has gradually replaced copper as the material for EDM electrodes.
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