EDM Graphite Grades - POCO - Entegris

EDM Graphite Grades - POCO - Entegris

Each of our EDM graphite grades has been meticulously engineered for specific electrode applications, delivering benchmarked performance characteristics.

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With over 50 years of industry expertise, we have perfected the balance of metal removal rates, low electrode wear, and superior surface finishes. Our EDM electrode materials ensure excellent total cost of ownership due to our tightly controlled manufacturing processes, which guarantee consistent performance from block to block, year after year. Our skilled applications engineers are ready to help you with grade selection and machine parameters tailored to your specific needs.

We offer our graphite grades in various forms, including billets, semi-finished rods, blocks, and plates.

Grades of Graphite Electrodes

Understanding Graphite Electrodes

Graphite electrodes are resistant electrodes made from petroleum coke and pitch coke as aggregates, with coal pitch acting as a binder. These electrodes go through processes like calcining, crushing, grinding, batching, kneading, shaping, roasting, impregnation, graphitization, and mechanical processing to become high-temperature conductive materials.

They conduct electricity to generate heat, which melts scrap iron or other raw materials in furnaces to produce steel and other metal products. The ability to withstand thermal gradients in an electric arc furnace makes them indispensable for steelmaking and other high-temperature applications such as smelting yellow phosphorus, industrial silicon, and abrasives.

Specific Grades of Graphite Electrodes

Graphite electrodes are classified into three main grades: Regular Power (RP), High Power (HP), and Ultra High Power (UHP), depending on their quality indicators.

1. Regular Power Graphite Electrodes (RP) are made from ordinary-grade petroleum coke. Due to their lower graphitization temperature, they have higher resistivity, higher linear expansion coefficients, and poorer thermal shock resistance, which limits their allowable current density.

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2. High Power Graphite Electrodes (HP) are produced with high-quality petroleum coke or low-level needle coke. Sometimes the electrode body is impregnated to enhance its properties. They have better physical and mechanical properties compared to RP grades, such as lower resistivity and a higher allowable current density.

3. Ultra High Power Graphite Electrodes (UHP) are made using high-grade needle coke, and the graphitization heat treatment is performed in in-line graphitization furnaces at temperatures as high as 2800-3000°C. This results in very low resistivity, high allowable current density, small linear expansion coefficients, and excellent thermal shock resistance.

These three grades find applications across various industries, such as metallurgy, chemical industry, electric power, glass industry, and semiconductor industry, playing indispensable roles.

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