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550mm RP Graphite Electrode — High-Performance Solution for Large-Capacity Electric Arc Furnaces
Ideal for large-capacity electric arc furnaces (EAF), ladle furnaces (LF), and submerged arc furnaces (SAF). Widely used in high-output steel plants and ferroalloy production, especially for facilities exceeding 700,000 tons annually aiming to reduce electrode consumption and improve process stability.
Description
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Main Description
The 550mm Regular Power (RP) graphite electrode is engineered for large-scale electric arc furnace (EAF) applications, delivering superior electrical conductivity, mechanical strength, and thermal stability. Optimized for standard power use, it offers an excellent balance of cost-efficiency and operational reliability, making it ideal for high-volume carbon steel and ferroalloy production.
RP Graphite Electrodes Parameters — 550mm
| Parameter | Unit | Electrode | Nipple |
| Resistivity | μΩ·m | 7.5 ~ 8.5 | 5.8 ~ 6.5 |
| Bending Strength | MPa | ≥ 8.5 | ≥ 16.0 |
| Elastic Modulus | GPa | ≤ 9.3 | ≤ 13.0 |
| Bulk Density | g/cm³ | 1.55 ~ 1.63 | ≥ 1.74 |
| Thermal Expansion Coefficient (CTE) | 10⁻⁶/°C | ≤ 2.4 | ≤ 2.0 |
| Ash Content | % | ≤ 0.3 | ≤ 0.3 |
| Allowable Current | A | — | 28000 ~ 34000 |
| Current Density | A/cm² | — | 12 ~ 14 |
| Actual Diameter | mm | Max: 562 Min: 556 | — |
| Actual Length | mm | 1800 ~ 2400 (Customizable) | — |
| Length Tolerance | mm | ±100 | — |
| Short Ruler Length | mm | -275 | — |
Raw Materials & Manufacturing Process:
The 550mm RP electrodes are produced using premium petroleum coke combined with a controlled ratio of high-quality needle coke to enhance electrical conductivity and mechanical strength. The manufacturing process includes:
● High-temperature calcination (up to 1350 °C) to reduce volatile content and increase carbon purity
● Precision blending with specially modified coal tar pitch for uniform filler dispersion
● High-pressure extrusion and molding to achieve dense, defect-free structures
● Initial baking at 800–900 °C to establish strong carbon bonding
● Vacuum pitch impregnation and secondary baking to reduce porosity and improve oxidation resistance
● High-temperature graphitization at 2800–3000 °C for low resistivity and excellent crystalline alignment
This process results in electrodes with outstanding thermal shock resistance, mechanical durability, and consistent quality, ideal for continuous, heavy-duty steelmaking operations.
Application Areas:
● Large electric arc furnaces (EAFs) with heavy current and thermal load demands
● Ladle furnaces (LFs) for secondary refining and alloying
● Submerged arc furnaces (SAFs) used in ferroalloy smelting (e.g., ferrosilicon, ferromanganese)
● Steel plants with annual outputs exceeding 700,000 tons seeking to optimize electrode consumption and operational costs
Operational Considerations:
This RP electrode is designed for regular power EAFs and is not recommended for Ultra High Power (UHP) furnaces. Strict arc control, current management, and regular joint inspection are essential to prevent thermal cracking and extend electrode lifespan.
Performance Benefits:
● Supports high current loads for large-scale melts
● Superior oxidation resistance and thermal shock durability
● Up to 1.2 kg reduction in electrode consumption per ton of steel
● Enhanced mechanical strength minimizes cracking and extends service life
● Cost-effective alternative to UHP electrodes in standard power applications
Summary
The 550mm RP graphite electrode offers a reliable, cost-effective solution for large-scale steelmaking facilities. Its superior conductivity, mechanical integrity, and thermal stability make it ideal for heavy-duty applications, helping steel plants reduce electrode consumption and improve process efficiency.
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