Graphite electrode is a non-flammable, high temperature resistant conductive material, used in electric arc furnace steelmaking.
Are graphite electrodes flammable?
• High temperature resistance: The melting point of graphite is 3850±50℃, and the boiling point is 4250℃. Even if burned by ultra-high temperature arc, the weight loss is very small, and the thermal expansion coefficient is also very small. The strength of graphite increases with the increase of temperature. At 2000°C, the strength of graphite doubles.
• Electrical and thermal conductivity: The electrical conductivity of graphite is one hundred times higher than that of general non-metallic minerals. The thermal conductivity exceeds that of metal materials such as steel, iron, and lead. The thermal conductivity decreases with increasing temperature, and even at extremely high temperatures, graphite becomes an insulator. Graphite can conduct electricity because each carbon atom in graphite only forms 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transfer charge.
• Lubrication: The lubrication performance of graphite depends on the size of the graphite flakes. The larger the flakes, the smaller the friction coefficient and the better the lubrication performance.
• Chemical stability: Graphite has good chemical stability at room temperature, and can resist acid, alkali and organic solvent corrosion.
• Plasticity: Graphite has good toughness and can be rolled into very thin flakes.
• Thermal shock resistance: Graphite can withstand drastic changes in temperature without being damaged when used at room temperature. When the temperature changes suddenly, the volume of graphite will not change much and no cracks will occur.
Normal consumption rate of graphite electrodes
Graphite electrodes are consumed every 8 to 10 hours in EAF steel production and are therefore an essential input, the purchase of which alone accounts for 3 to 5% of steel manufacturing costs.
Graphite electrodes should not come into contact why?
Graphite will produce a lot of dust during processing. Whether it is milling, turning, drilling or planing, it will produce dust. If it is inhaled into the lungs for more than a certain level, when the body cannot eliminate these dusts through metabolism, your lungs and bronchi are very difficult. It may be injured and inflamed. Over time, it will induce various respiratory diseases. It is recommended that you wear a mask when you work.
Therefore, inhalation of dust in the graphite electrode production process is harmful to the lungs, but the finished graphite electrode is not harmful and can be contacted normally.