What is HP Graphite Electrode?
High Power Graphite Electrodes are a type of graphite electrodes that are designed to withstand higher current densities and more severe operating conditions compared to regular power graphite electrodes. These electrodes are primarily used in electric arc furnaces (EAFs) for steelmaking processes that require higher power inputs and more demanding performance characteristics.
AGRM is a full-process manufacturer, owning the entire process of graphite electrode production including coking, calcination, forming, first baking, impregnation, second baking in tunnel kilns, graphitization, machining, and other processes. The production cycle is 3 to 6 months, and there is inventory in each link of the production process. The long-term inventory is around 10,000 tons, with an annual production capacity of 30,000 tons.
As a professional graphite electrode manufacturer, we also offer RP graphite electrodes and UHP graphite electrodes. The diameter of HP graphite eletrode ranges from 200 mm to 600 mm. It is mainly used for high-power electric arc furnaces with a current density range of 18–25 A/cm2.
The demand for larger diameter electrodes has been on the rise with the increase in size of EAF furnaces. Graphite electrodes with diameters of 500 mm or 600 mm have seen growing popularity in recent years.
Application of Graphite Electrode
Graphite electrodes are widely used for the production of alloy steels, metal and other nonmetallic materials, etc. in different types of furnaces. HP graphite electrodes are usually used in DC electric arc furnace, AC electric arc furnace and submerged arc furnace etc.
Graphite Electrode for AC Arc Furnace
Graphite Electrode for DC Arc Furnace
Electrodes Submerged Arc Furnace
Key Points about High Power Graphite Electrodes
Composition
High Power Graphite Electrodes are manufactured using high-quality petroleum coke, coal tar pitch, and other carbonaceous materials similar to regular power electrodes. However, they are typically produced with higher graphitization levels and more stringent quality control measures to enhance their electrical conductivity and mechanical strength.
Electrical Conductivity
High Power Graphite Electrodes exhibit superior electrical conductivity compared to regular power electrodes, allowing them to efficiently conduct electricity and generate intense heat during the steelmaking process. They are capable of withstanding higher current densities, making them suitable for high-power applications.
Sizes and Specifications
High Power Graphite Electrodes are available in various sizes and specifications to suit different furnace capacities and operating conditions. The diameter, length, and current-carrying capacity of the electrodes can be customized based on the specific requirements of the steelmaking operation.
Mechanical Strength
High Power Graphite Electrodes are engineered to withstand the mechanical stresses and thermal shocks experienced during high-power steelmaking operations. They possess high mechanical strength and resistance to breakage, deformation, and oxidation at elevated temperatures.
Application
High Power Graphite Electrodes are used in EAFs for steelmaking processes that require higher power inputs and more demanding performance characteristics. These electrodes are employed in applications such as ultra-high-power steelmaking, steel refining, and the production of specialty steel grades.
HP Graphite Electrodes Specification
Technical Specification of HP Graphite Electrode
| Diameter | Resistance (≤, µΩ·m) | Density (≥, g/cm3) | Flexure Strength (≥, MPa) | Elastic Modulus (≤, GPa) | Ash Content (≤, %) | CTE (100 °C – 600 °C) (≤, 10-6/°C) | Current Load (A) | Current Density (A/cm2) | |
|---|---|---|---|---|---|---|---|---|---|
| inch | mm | ||||||||
| 8 | 200 | 6.5 | 1.62 | 10.5 | 12 | 0.3 | 2.4 | 5500–9000 | 18–25 |
| 9 | 225 | 6.5 | 1.62 | 10.5 | 12 | 0.3 | 2.4 | 6500–10000 | 18–25 |
| 10 | 250 | 6.5 | 1.62 | 10.5 | 12 | 0.3 | 2.4 | 8000–13000 | 18–25 |
| 12 | 300 | 6.5 | 1.62 | 10.5 | 12 | 0.3 | 2.4 | 13000–17400 | 17–24 |
| 14 | 350 | 6.5 | 1.62 | 10.5 | 12 | 0.3 | 2.4 | 17400–24000 | 17–24 |
| 16 | 400 | 6.5 | 1.62 | 10.5 | 12 | 0.3 | 2.4 | 21000–31000 | 16–24 |
| 18 | 450 | 6.5 | 1.60 | 9.8 | 12 | 0.3 | 2.4 | 25000–40000 | 15–24 |
| 20 | 500 | 6.5 | 1.60 | 9.8 | 12 | 0.3 | 2.4 | 30000–48000 | 15–24 |
| 22 | 550 | 6.5 | 1.60 | 9.8 | 12 | 0.3 | 2.4 | 37000–57000 | 15–23 |
| 24 | 600 | 6.5 | 1.60 | 9.8 | 12 | 0.3 | 2.4 | 44000–67000 | 15–23 |
Graphite Electrode Size & Tolerance
| Diameter (mm) | Length (mm) | ||||||
|---|---|---|---|---|---|---|---|
| Nominal Diameter | Actual Diameter | Nominal Length | Tolerance | Short Length | |||
| (inch) | (mm) | (max.) | (min.) | (rough spot) | |||
| 8 | 200 | 205 | 200 | 197 | 1600 | ±100 | -275 |
| 9 | 225 | 230 | 225 | 222 | 1600 | ||
| 10 | 250 | 256 | 251 | 248 | 1600/1800 | ||
| 12 | 300 | 307 | 302 | 299 | 1600/1800 | ||
| 14 | 350 | 357 | 352 | 349 | 1600/1800 | ||
| 16 | 400 | 409 | 403 | 400 | 1600/1800/2000/2200 | ||
| 18 | 450 | 460 | 454 | 451 | 1600/1800/2000/2200 | ||
| 20 | 500 | 511 | 505 | 502 | 1800/2000/2200/2400 | ||
| 22 | 550 | 562 | 556 | 553 | 1800/2000/2200/2400 | ||
| 24 | 600 | 613 | 607 | 604 | 2000/2200/2400 | ||
| Specification | Defect Dimension Nominal Diameter of Graphite Electrode (mm) | |
|---|---|---|
| 300–400 | 450–600 | |
| Diameter (mm) | 20–40 (< 20 mm should be negligible) | 30–50 (< 30 mm should be negligible) |
| Depth (mm) | 5–10 (< 5 mm should be negligible) | 10–15 (< 10 mm should be negligible) |
| Item | RP Graphite Electrode | HP Graphite Electrode | UHP Graphite Electrode | |||
| Nominal Diameter/mm | Current Carrying Capacity/A | Current Density/(A/cm2) | Current Carrying Capacity/A | Current Density/(A/cm2) | Current Carrying Capacity/A | Current Density/(A/cm2) |
| 150 | 3000-4500 | 16-25 | ||||
| 200 | 5000-6900 | 15-21 | 5500-9000 | 18-25 | ||
| 250 | 7000-10000 | 14-20 | 8000-13000 | 18-25 | ||
| 300 | 10000-13000 | 14-18 | 13000-17400 | 17-24 | 15000-22000 | 20-30 |
| 350 | 13500-18000 | 14-18 | 17400-24000 | 17-24 | 20000-30000 | 20-30 |
| 400 | 18000-23500 | 14-18 | 21000-31000 | 16-24 | 25000-40000 | 19-30 |
| 450 | 22000-270000 | 13-17 | 25000-40000 | 15-24 | 32000-45000 | 19-27 |
| 500 | 25000-32000 | 13-16 | 30000-48000 | 15-24 | 38000-55000 | 18-27 |
| 550 | 28000-34000 | 12-14 | 34000-53000 | 14-22 | 45000-65000 | 18-27 |
| 600 | 30000-36000 | 11-13 | 38000-58000 | 13-21 | 50000-75000 | 18-26 |
| 650 | 32000-39000 | 10-12 | 41000-65000 | 12-20 | 60000-85000 | 18-25 |
| 700 | 34000-42000 | 9-11 | 45000-72000 | 12-19 | 70000-120000 | 18-30 |
