RP Hp UHP dia 200 graphite electrode for arc furnaces
| 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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In electrical discharge machining (EDM), graphite electrodes have revolutionized the production of complex metal parts, from aerospace components to medical implants. Unlike copper electrodes, graphite offers unique advantages that make it the material of choice for high-precision, high-efficiency EDM operations.
EDM works by generating sparks between an electrode and a workpiece, eroding material to achieve the desired shape. Graphite excels here due to its high electrical conductivity, low melting point (~3,600°C), and resistance to thermal shock. Unlike copper, which softens at high temperatures, graphite maintains structural integrity during intense sparking, enabling faster material removal rates. For example, graphite electrodes can cut hardened steel 2–3x faster than copper.
Another key benefit is machinability. Graphite is brittle but easy to shape with conventional tools (e.g., diamond-coated cutters), allowing for intricate geometries-even micro-details down to 5 μm. This contrasts with copper, which requires expensive CNC grinding for fine features. Additionally, graphite's low material cost (relative to copper) and minimal post-processing (no burrs, minimal deburring) reduce overall production expenses.
Applications span industries: in mold-making, graphite electrodes create complex cavities for plastic injection molds; in aerospace, they machine turbine blades with tight tolerances. Recent advancements, such as ultra-fine-grain graphite (particle size < 5 μm), have expanded its use to micro-EDM, where precision is paramount. As EDM technology evolves, graphite electrodes continue to set the standard for versatility and cost-effectiveness.
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