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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 tip can reach 3,000° Fahrenheit. That’s half the temperature 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 strength and elastic modulus. These graphite indicators and differences between national standards, manufacturing processes and raw materials are used to divide graphite into power electrodes of ordinary graphite (RP), ultra-high power electrodes of ultra-high graphite power (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 graphite sample 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. 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. 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. Capacity is measured in MPa. 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 a way to measure elasticity of a material. It measures the stress-strain relationship within the elastic deformation area. The greater modulus, and therefore the greater stress, is required to cause elastic deformation. Simply put, the greater modulus, the more elastic the material.
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 passing the electrode is usually less than 0.5%. Ash levels within 1% have no impact on steelmaking. The impurity elements will affect the performance of anti-oxidation systems of the electrodes, etc.
(aka. Technology Co. Ltd., a global chemical supplier & manufacturer that has over 12 year’s experience in providing high-quality Nanomaterials and chemicals. Our company produces graphite with high purity, small particles and low impurity levels. If you require a lower grade, please do not hesitate to contact us.

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