adminGraphite electrodes are used primarily in the EAF steelmaking process for melting scrap steel. Because it is resistant to high temperatures, graphite electrodes are made. An electric arc furnace can heat the electrode to 3000 degrees Fahrenheit. That’s half the temperature of the earth. You can find electrode sizes ranging in size from 75 mm to maximum 750 mm and as long as 2800 mm.
These are key indicators for graphite electrode performance and quality: bulk density, electrical resistivity, bending strengths, elastic modulus E and thermal expansion coefficient. These graphite-electrode indicators, as well as the differences among different manufacturing processes and standards in raw materials, are used to determine whether graphite is divided into three types: ordinary power graphite (RP), ultra high power graphite (UHP) and super-high power (UHP). The plant that produces graphite can also produce graphite-electrodes with high density graphite (HD) or quasi-super-high (SHP), according to different functional requirements.
National standards are the foundation of each company’s corporate standards. Customers will create their own quality standards. A relative volume density measures the proportion of graphite material samples that are quality managed to their volumes. Unit: g/cm3. A working electrode’s volume density determines its strength and efficiency. It is generally true that the electrode’s resistivity will be lower if it has a greater volume density.
For measuring conductivity of electrodes, resistance is an indicator. The resistance of the conductor against current is measured when current passes through the conductor. It is the resistance for a conductor of length 1m with cross-sectional area 1m2 at a temperature of certain. This reduces usage during operation.
It is an indicator of how well the mechanical system in graphite structures material performs. Also known as the Flexural Strength, it is a measure of how strong the graphite structure material’s mechanical system performs. The object will bend to the immediate limit set by an external force to resist risk if the force exerted is parallel to its axis. Capacity is measured in MPa. When using the network, high-strength joint and electrodes are less likely break.
Modulus of Elasticity is an important part of mechanical property. The modulus of elastic is an indicator to determine the elastic deformation potential of a material. This refers the stress-strain relationship within the elastic limit. Simply put, the larger the elastic modulus for brittle materials is, the more elastic deformation it will generate.
An important parameter for thermal performance, the thermal expansion coefficient of graphite is an electrode. Chinese products are more stable if their thermal expansion coefficient is lower than it is. Performance can be reflected in the lower consumption of the product and the reduced fractures.
The term ash refers to any other component in solid products than carbon graphite. The raw material used has a direct impact on graphite’s ash contents. Low ash levels are found in petroleum coke needle coalke. This means that the amount of graphite passing through the electro is usually not greater than 0.5% and that ash levels within 1% have no impact on steelmaking. The performance of anti-oxidation systems of working electrodes will be affected by impurities found in the ash.
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