Quality Index of Graphite Electrode

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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. 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 the differences in raw material manufacturing processes or national standards for graphite materials, graphite is divided into ordinary power electrodes(RP), high power electrodes(HP), and ultrahigh power electrodes(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.
Using national standards as a base, each company sets its own corporate standard, and the customer will set their own quality standards. The relative density of volume is the ratio of quality control of the sample graphite electrode material to its volume. 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 and strength of the anti-oxidation systems. Generally, the higher the volume density, the less resistivity 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. The value equals 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. It is an index that measures the elastic deformation of a materials and relates to the stress-strain relationship 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 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 is usually less than 0.5% and the ash within 1% will not have any effect on steelmaking. However, the impurity in the ash may reduce the performance, for example, of the anti-oxidation systems of the electrodes.
(aka. Technology Co. Ltd., a trusted global chemical supplier and manufacturer with more than 12 years of 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.