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Quality Index of Graphite Electrode |

Graphite electrodes are used primarily in the EAF steelmaking process, to melt scrap metal. The electrodes are made of graphite as it is able to withstand high temperature. In an electric furnace, the tip can reach 3,000° Fahrenheit. That is half of the temperature at the surface of the sun. The diameter of the electrode can vary from 75 mm up to 750 mm. Its maximum length is 2800 mm. The main indicators that determine the quality of graphite are: bulk density, electrical resistance, bending force, elastic modulus, thermal expansion coefficient, and ash percentage. Based on these graphite indicators, and the differences in raw material manufacturing processes or national standards for graphite materials, graphite is divided into three categories: ordinary power graphite (RP), high-power graphite (HP), and Ultra-high Power graphite (UHP). In order to meet the needs of various users, the production line for post-graphite electrodes can also add high-density and quasi super-high graphite (SHP) electrodes.

Each company sets its own corporate standard based upon national standards. Customers will then set their own quality standards. The relative density of a sample of graphite electromaterial is the ratio of its volume to the quality of its management. The unit is grams per cubic centimeter. The higher the volume density the denser and stronger the electrode. This is directly related to the performance of anti-oxidation systems. The lower its resistance is, in general, the more volume density influences the same electrode type.

It is used as a parameter to measure the conductivity of electrodes. It is the resistance that the conductor has to current flowing through it. The value equals the resistance of a 1m long conductor with 1m2 of cross-sectional space at a specified temperature. This reduces consumption.

The flexural force is a parameter which characterizes performance of mechanical system in graphite material. This is also known as the flexural resistance. This means that the object will bend up to its instantaneous limit to resist risk when the external force perpendicularly crosses the axis. MPa is the unit of capacity. The network is less likely to be damaged by electrodes or joints with high strength.

The modulus elasticity is a key aspect of mechanical properties. It is a way to measure a material’s ability to deform elastically. It measures the stress-strain relationship within the elastic range. The greater modulus, and therefore the greater stress, is required to cause elastic deformation.

The thermal coefficient of graphite used as an electrode can be a critical parameter for thermal performance. The higher the value of the coefficient, the better the thermal stability. The more oxidation resistant the product, the better the performance. Less fracture and less consumption would result in less loss.

Ash can refer to solids other than carbon graphite. Graphite’s ash content is directly affected the ash of the raw materials. The ash level of petroleum coke neocoke is very low. As a result, the ash of graphite that is passed through the electrode has a maximum ash level of 0.5%. Ash levels within 1% have no impact on steelmaking. Obviously, the impurities in the ash reduce the performance, for example, of the anti-oxidation systems of the electrodes.

(aka. Technology Co. Ltd., a trusted global chemical supplier & manufacturer has over 12 year’s experience in providing high-quality Nanomaterials and chemicals. Our company produces graphite with high purity, small particles and low impurities. If you require a lower grade, please do not hesitate to contact us.
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