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650mm / 700mm UHP Graphite Electrode
The 650mm and 700mm UHP graphite electrodes are essential for large-scale EAF and LF operations, enabling efficient scrap melting and precise steel refining. Their superior electrical conductivity, thermal resistance, and mechanical strength ensure reliable performance under extreme industrial conditions, making them critical for improving output and steel quality in modern metallurgy.
Description
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Basic Description
The 650mm and 700mm Ultra High Power (UHP) graphite electrodes represent the highest standard in large-scale steelmaking and non-ferrous refining, specifically engineered for ultra-high current applications in electric arc furnaces (EAF) and ladle furnaces (LF). These large-diameter electrodes offer outstanding electrical conductivity, excellent thermal shock resistance, and robust mechanical strength under extreme industrial conditions.
Key Technical Specifications:
650mm UHP Electrode
| Parameter | Unit | Electrode | Nipple |
| Resistivity | μΩ·m | 4.5 ~ 5.4 | 3.0 ~ 3.6 |
| Bending Strength | MPa | ≥ 10.0 | ≥ 24.0 |
| Elastic Modulus | GPa | ≤ 13.0 | ≤ 20.0 |
| Bulk Density | g/cm³ | 1.68 ~ 1.72 | 1.80 ~ 1.86 |
| Thermal Expansion Coefficient | 10⁻⁶/°C | ≤ 1.2 | ≤ 1.0 |
| Ash Content | % | ≤ 0.2 | ≤ 0.2 |
| Allowable Current | A | — | 70000 ~ 86000 |
| Current Density | A/cm² | — | 21 ~ 25 |
| Actual Diameter | mm | 650 | — |
| Actual Length (Customizable) | mm | 2200 - 2700 | — |
| Length Tolerance | mm | ±100 | — |
| Short Ruler Length | mm | -300 | — |
700mm UHP Electrode
| Parameter | Unit | Electrode | Nipple |
| Resistivity | μΩ·m | 4.5 ~ 5.4 | 3.0 ~ 3.6 |
| Bending Strength | MPa | ≥ 10.0 | ≥ 24.0 |
| Elastic Modulus | GPa | ≤ 13.0 | ≤ 20.0 |
| Bulk Density | g/cm³ | 1.68 ~ 1.72 | 1.80 ~ 1.86 |
| Thermal Expansion Coefficient | 10⁻⁶/°C | ≤ 1.2 | ≤ 1.0 |
| Ash Content | % | ≤ 0.2 | ≤ 0.2 |
| Allowable Current | A | — | 73000 ~ 96000 |
| Current Density | A/cm² | — | 18 ~ 24 |
| Actual Diameter | mm | 700 | — |
| Actual Length (Customizable) | mm | 2200 - 2700 | — |
| Length Tolerance | mm | ±100 | — |
| Short Ruler Length | mm | — | — |
Manufacturing Process & Quality Control
These UHP electrodes are manufactured through a rigorous process involving high-purity needle coke, followed by calcination, molding, baking, high-pressure impregnation, and high-temperature graphitization (above 2800°C). Precision machining of both electrodes and nipples ensures tight dimensional tolerance, low joint resistance, and arc stability during high-power operations.
Application Scenarios:
● Electric Arc Furnace (EAF) Steelmaking
Ideal for ultra-high power steel melting using scrap or DRI in large-scale mills. These electrodes handle continuous operation with high arc temperatures and massive electrical loads.
● Ladle Furnace (LF) Refining
Critical in secondary metallurgy for temperature control, alloy adjustments, and inclusion removal—ensuring clean, high-quality steel output.
● Non-Ferrous High-Temperature Smelting
Also used in aluminum, copper, and nickel melting, where arc consistency and purity are essential to product quality and furnace efficiency.
Key Advantages:
● High Electrical Conductivity → Enhances energy efficiency and arc stability
● Excellent Thermal Shock Resistance → Reliable performance under cyclic thermal stress
● High Mechanical Strength → Reduces risk of breakage during handling and operation
● Low Ash and Impurities → Preserves melt purity and end-product quality
● Long Service Life → Lowers total consumption per ton of steel
Conclusion
650mm and 700mm UHP graphite electrodes are indispensable for high-output, energy-intensive metallurgical operations. Their superior structural properties ensure stable performance under extreme load conditions, making them the ideal choice for modern steel producers seeking reliability, energy efficiency, and lower operating costs.
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