Carbon Graphite Electrode RP Hp UHP grade
| Item | Unit | RP | HP | UHP | ||||
| 250-400 | 450-800 | 300-400 | 450-700 | 300-400 | 450-700 | |||
| Electric Resistivity | Electrode | μΩ.m | 7.5-8.6 | 7.5-8.8 | 5.5-6.8 | 5.5-7.0 | 4.6-6.0 | 4.8-6.2 |
| Nipple | 4.5-5.5 | 4.0-5.0 | 3.5-4.5 | |||||
| Bending Strength | Electrode | Mpa | ≥8.0 | ≥11.0 | ≥11.0 | |||
| Nipple | ≥15.0 | ≥16.0 | ≥18.0 | |||||
| Elastic Modulus | Electrode | Gpa | ≤9.0 | ≤11.0 | ≤13.0 | |||
| Nipple | ≤13.0 | ≤14.0 | ≤15.0 | |||||
| Bulk Density | Electrode | g/cm3 | 1.55-1.65 | 1.63-1.73 | 1.65-1.75 | |||
| Nipple | 1.70-1.75 | 1.73-1.80 | 1.75-1.82 | |||||
| Ash | Electrode | % | ≤0.3 | |||||
| Nipple | ||||||||
| CTE(100-600)ºC | Electrode | 10-6/ºC | 2.00-2.50 | 1.80-2.00 | 1.30-1.50 | |||
| Nipple | 1.50-1.80 | 1.50-1.80 | 1.20-1.40 | |||||
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Why are carbon graphite electrodes preferred in RP, HP, and UHP grades for EAFs, and how does carbon content influence their performance?
Carbon graphite is the material of choice for EAF electrodes due to its unique combination of properties:
Electrical Conductivity: Graphite's low resistivity (enhanced in HP/UHP grades) ensures efficient current transfer, critical for generating the high temperatures needed to melt steel.
Thermal Stability: Graphite withstands extreme EAF temperatures (up to 3,000°C) without melting, unlike metals or ceramics. Its thermal shock resistance prevents cracking during rapid heating/cooling cycles.
Mechanical Strength: High-purity graphite (used in HP/UHP) offers superior flexural and compressive strength, essential for handling large-diameter electrodes in heavy-duty EAFs.
The carbon content (typically >99%) directly impacts performance:
RP Grade: Contains slightly higher impurities (e.g., ash, sulfur) and coarser graphite particles, reducing conductivity and strength but lowering production costs.
HP/UHP Grades: Use ultra-high-purity graphite (>99.5% carbon) with minimal impurities, minimizing electron scattering (lower resistivity) and enhancing structural integrity. Finer particle sizes (down to 5–10 μm in UHP) further densify the material, improving thermal and mechanical performance.
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