Using coal pitch as binder, the graphite electrode which is mainly made of petroleum coke and needle coke is being made through the process of calcination, compounding, kneading, pressing, baking,impregnation, graphitization and machining. It is a conductor that release electrical energy to heat and melt the charge in the form of an electric arc in an electric arc furnace, and has the characteristics of low electrical resistivity, good electrical conductivity, low ash content, uniform structure, good oxidation resistance and high mechanical strength.
Item | Unit | RP | HP | UHP | ||||
200-400 | 450-600 | 200-400 | 450-600 | 300-400 | 450-600 | |||
Electric Resistivity(≤) | Electrode | μΩ·m | 8.5 | 9.0 | 7.0 | 7.5 | 6.2 | 6.5 |
Nipple | 6.5 | 6.5 | 6.5 | 6.5 | 5.5 | 5.5 | ||
Bending Strength (≥) | Electrode | MPa | 9.8 | 9.8 | 10.5 | 9.8 | 10.5 | 10.0 |
Nipple | 13.0 | 13.0 | 14.0 | 14.0 | 16.0 | 16.0 | ||
Elastic Modulus (≤) | Electrode | GPa | 9.3 | 9.3 | 12.0 | 12.0 | 14.0 | 14.0 |
Nipple | 14.0 | 14.0 | 16.0 | 16.0 | 18.0 | 18.0 | ||
Bulk Density (≥) | Electrode | g/cm3 | 1.58 | 1.58 | 1.60 | 1.60 | 1.65 | 1.64 |
Nipple | 1.63 | 1.63 | 1.70 | 1.70 | 1.72 | 1.70 | ||
Ash(≤) | Electrode | % | 0.5 | 0.5 | 0.3 | 0.3 | 0.3 | 0.3 |
Nipple | ||||||||
C.T.E.(≤) | Electrode | 10-6/°C | 2.9 | 2.9 | 2.4 | 2.4 | 1.5 | 1.5 |
Nipple | 2.7 | 2.7 | 2.2 | 2.2 | 1.4 | 1.4 | ||
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