What is RP Graphite Electrode?
RP graphite electrode refers to Regular Power Graphite Electrodes. Regular Power Graphite Electrodes are a type of graphite electrodes commonly used in electric arc furnaces (EAFs) for steelmaking. These electrodes are made from high-quality petroleum coke, coal tar pitch, and other carbonaceous materials, which are processed and graphitized to achieve the desired electrical conductivity and mechanical strength.
As a professional graphite electrode manufacturer, we also offer HP graphite electrodes and UHP graphite electrodes. The main differences between RP (Regular Power), HP (High Power), and UHP (Ultra High Power) graphite electrodes lie in their composition, electrical conductivity, mechanical strength, and suitability for different steelmaking applications.
Application of Graphite Electrode
Graphite electrodes are widely used in various industrial applications, primarily in electric arc furnaces (EAFs) for steelmaking. Graphite electrodes are essential components in a wide range of industrial processes where high temperatures, electrical conductivity, and resistance to thermal and mechanical stress are required. Their versatility and reliability make them indispensable in the production of metals, alloys, chemicals, and other essential products.
Regular Power Graphite Electrodes play a critical role in the steelmaking process, providing reliable and efficient electrical energy transfer for melting scrap steel and producing high-quality steel products in electric arc furnaces.
RP Graphite Electrode for EAF Steelmaking
RP Graphite Electrodes for Regular Power EAFs
Electric Arc Furnace Graphite Electrodes
Key Points about Regular Power Graphite Electrodes
Composition
Composition: Regular Power Graphite Electrodes are typically composed of approximately 70-80% petroleum coke, 20-30% coal tar pitch, and small amounts of additives. These materials are mixed, extruded into the desired shape, and then baked and graphitized at high temperatures.
Electrical Conductivity
Graphite electrodes exhibit excellent electrical conductivity, allowing them to efficiently conduct electricity and generate intense heat through the electric arc formed between the electrode tip and the charged materials in the EAF.
Sizes and Specifications
Regular 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
Regular Power Graphite Electrodes are engineered to withstand the mechanical stresses and thermal shocks experienced during the steelmaking process. They possess high mechanical strength and resistance to breakage, deformation, and oxidation at elevated temperatures.
Application
Regular Power Graphite Electrodes are primarily used in EAFs for the production of steel through the electric arc furnace route. They are employed to supply electrical energy to the melting process and facilitate the melting of scrap steel or direct reduced iron (DRI) into liquid steel.
RP Graphite Electrodes Specification
Technical Specification of RP Graphite Electrode
| Dia. (inch) | Resistance (≤, µΩ·m) | Density (≥, g/cm3) | Flexure Strength (≥, MPa) | Elastic Modulus (≤, GPa) | Ash Content (≤, %) | CTE (100 °C – 60 °C) (≤, 10-6/°C) | Current Load (A) | Current Density (A/cm2) |
|---|---|---|---|---|---|---|---|---|
| 8 | 8.5 | 1.53 | 8.5 | 9.3 | 0.5 | 2.9 | 5000–6900 | 15–21 |
| 9 | 8.5 | 1.53 | 8.5 | 9.3 | 0.5 | 2.9 | 6100–8600 | 15–21 |
| 10 | 8.5 | 1.53 | 8.5 | 9.3 | 0.5 | 2.9 | 7000–10000 | 14–20 |
| 12 | 8.5 | 1.53 | 8.5 | 9.3 | 0.5 | 2.9 | 10000–13000 | 14–18 |
| 14 | 8.5 | 1.52 | 7.0 | 9.3 | 0.5 | 2.9 | 13500–18000 | 14–18 |
| 16 | 8.5 | 1.52 | 7.0 | 9.3 | 0.5 | 2.9 | 18000–23500 | 14–18 |
| 18 | 8.5 | 1.52 | 7.0 | 9.3 | 0.5 | 2.9 | 22000–27000 | 13–17 |
| 20 | 8.5 | 1.52 | 7.0 | 9.3 | 0.5 | 2.9 | 25000–32000 | 13–16 |
| 22 | 8.5 | 1.52 | 7.0 | 9.3 | 0.5 | 2.9 | 32000–40000 | 13–16 |
| 24 | 8.5 | 1.52 | 7.0 | 9.3 | 0.5 | 2.9 | 38000–47000 | 13–16 |
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) |
