Details of UHP HP RP graphite electrode parameters

Details of UHP HP RP graphite electrode parameters

Graphite electrode is mainly made of petroleum coke and needle coke as raw materials, coal tar pitch is used as a binder, and it is made by calcination, batching, kneading, pressing, roasting, graphitization, and machining. It is released in the form of electric arc in an electric arc furnace. The electric energy heats and melts the charge.

According to its quality index, it can be divided into ordinary power graphite electrode (RP), high power graphite electrode (HP) and ultra high power graphite electrode (UHP).

Common technical parameters of graphite electrodes are as follows:

1 Resistivity: Resistivity is a physical quantity used to express the resistance characteristics of various substances. The resistance of a conductor made of a certain material with a length of 1 meter and a cross-sectional area of 1 square meter is equal to the resistance of this material in value. rate. In the International System of Units, the unit of resistivity is ohm-meter2/meter, and common units are also ohm-millimeter2/meter.

2 Flexural strength: Flexural strength refers to the ultimate breaking stress when a material unit area bears a bending moment. Also known as flexural strength and modulus of rupture.

3 Elastic modulus: Generally speaking, when an external force is applied to the elastic body, the shape of the elastic body will change (called "deformation"). The general definition of "modulus of elasticity" is: the stress divided by the unidirectional stress state Strain in that direction. In the stage of elastic deformation of the material, its stress and strain become proportional (that is, in accordance with Hooke's law), and its proportional coefficient is called the elastic modulus. "Elasticity modulus" is a physical quantity that describes the elasticity of a material. It is a general term. It can be expressed as "Young's modulus", "shear modulus", "bulk modulus", etc.

4 Bulk density: refers to the weight of a given volume of material divided by the volume it occupies

5 Ash: Inorganic, it can be the residue after calcining or the residue after drying. But ash must be the solid part of a substance, not the gas or liquid part. At high temperatures, a series of physical and chemical changes occur, and finally the organic components volatilize and escape, while the inorganic components (mainly inorganic salts and oxides) remain. These residues are called ash.

6 Coefficient of thermal expansion: Objects expand and contract due to temperature changes. Its change ability is expressed by the change of the length value caused by the unit temperature change under equal pressure (p constant), that is, the coefficient of thermal expansion.