Petroleum coke and needle coke are the main raw materials used, along with coal pitch as binder. The material is then carbonized in a baking furnace and afterwards graphitized in an electric arc furnace. There are different quality levels available dividing electrodes into UHP, HP and RP grades. Graphite electrodes are the most suitable material to melt scraps, DRI, etc. by arc energy.
Items | Position | Unit | RP | HP | UHP |
Bulk Density | Body | g/cm3 | 1.54-1.65 | 1.60-1.70 | 1.64-1.76 |
Nipple | 1.64-1.69 | 1.70-1.80 | 1.70-1.80 | ||
Resistivity | Body | μΩ·m | 8.5-11.0 | 6.5-7.5 | 5.5-6.5 |
Nipple | 7.0-9.0 | 6.0-6.5 | 4.5-5.5 | ||
Ash | Body | % | 0.2-0.5 | 0.2-0.5 | 0.2-0.5 |
Nipple | 0.2-0.5 | 0.2-0.5 | 0.2-0.5 | ||
Bending Strength | Body | MPa | 6.5-10.0 | 10.0-12.0 | 10.0-12.0 |
Nipple | 13.0-15.0 | 14.0-16.0 | 16.0-17.0 | ||
Compressive Strength | Body | GPa | 8.5-9.5 | 10.0-12.0 | 12.0-14.0 |
Nipple | 12.0-14.0 | 14.0-16.0 | 16.0-18.0 | ||
Thermal Expansion(100-600°C) | Body | ×10-6/°C | 2.8-2.9 | 2.2-2.4 | 1.4-1.5 |
Nipple | 2.7-2.8 | 2.0-2.2 | 1.3-1.4 | ||
Diameter | Body | mm | 75-600 | 200-600 | 300-600 |
Length | Nipple | mm | 1600-1800 | 1800-2400 | 1800-2400 |
Screw | IEC,ISO,NEMA Standard,or per orders |