Quality Index of Graphite Electrode

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Graphite electrodes are used in the EAF steelmaking process primarily to melt scrap metal. The electrodes are made of graphite as it is able to withstand high temperature. The electrode tip can reach 3,000° Fahrenheit in an electric furnace. That is half the temperature of the sun’s surface. 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 strength and elastic modulus. According to these graphite indicators and differences between national standards, manufacturing processes and raw materials used in the production of graphite electrodes, graphite can be divided into ordinary power electrodes (RP), ultra-high power electrodes(UHP) and high power electrodes(HP). 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.
Customers will order quality standards on the basis of their company’s corporate standards. The relative density of a sample of graphite electromaterial is the ratio of its volume to the quality of the material. The unit is grams per cubic centimeter. The higher the volume density the denser and stronger the electrode. This is directly related to the strength of the system. The lower the resistance of an electrode is, in general, the more volume density it has.
It is a parameter used to measure the conductivity of electrodes. It is the resistance that the conductor has to current flowing through it. This value is the resistance of a conductor of length 1m with a cross sectional area of 1m2, 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. The MPa unit represents capacity. The network is less likely to be damaged by electrodes or joints with high strength.
The modulus of elastic is an important part of mechanical properties. The modulus is a measure of the elastic deformation capacity of a material. It refers to the strain-stress ratio within the elastic deformation spectrum. The greater modulus, and therefore the higher 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 greater the resistance to oxidation, the better the performance, and the lower the fractures, consumption, and loss.
Ash can refer to solids other than carbon graphite. As graphite’s ash content is directly influenced by the ash contents of the raw material used, the graphite electrode will be affected. The ash level of petroleum coke and needle coke are low. As a result, the ash of graphite passing the electrode is usually less than 0.5%. The ash within 1% will have no effect on the steelmaking process. 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. The graphite produced by our company is high-purity, with fine particles and low impurity levels. If you require a lower grade, please do not hesitate to contact us.