Quality Index of Graphite Electrode


Aug 2, 2023

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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 electrode tip can reach 3,000° Fahrenheit. That is about half the temperature of 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 a graphite electrolyte are its bulk density, or db; electrical resistance, or r; bending strength and elastic modulus, E; thermal expansion coefficient, A% and ash. According to the indicators of graphite and the differences in raw materials and national standards, graphite can be divided into three types: ordinary power electrodes (RP), ultra-high power electrodes(UHP), and high power electrodes. 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 standards of quality based upon national standards. Customers will then set their own standards of quality based upon the national standards. The relative density of the sample graphite electrode 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 anti-oxidation performance. Generally, the higher the volume density, the less resistivity it has.
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. This value is the resistance of a conductor of length 1m with a cross sectional area of 1m2 when heated to a certain 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 elasticity is one of the most important mechanical properties. The modulus is an index that measures the elastic deformation of a material. It refers to stress-strain within the elastic deformation spectrum. The greater modulus, and therefore the greater stress, is required to cause elastic deformation. Simply put, the greater modulus, and thus the greater stress, the smaller elastic modulus, of flexible materials.
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 fracture and consumption.
Ash can refer to solids other than carbon graphite. The graphite electrode is directly affected the the ash level of the raw material. The ash level of petroleum coke and needle coke are 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 impurity components in the ash reduce the performance, for example, of the anti-oxidation systems of the working electrode.
(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.