Home > News

Selection of graphite electrodes

Pulished on Nov. 23, 2019

Graphite electrodes can be divided into three types: ordinary, high and ultra high power according to the quality. They are conductors made of special materials such as stone tar and needle coke. The development of graphite electrode materials has been very mature, and its application is also very extensive. This is because graphite electrode materials have the incomparable advantages of traditional metal electrode materials such as copper.

First, the graphite is cheaper than the graphite electrodeand copper of the same performance. Especially with the rising price of copper materials in the past two years, graphite material has become the most affordable electrode material on the market.

Although the same volume of graphite material is 30% to 60% cheaper than copper, the performance of graphite is not compromised at all. Metal materials, especially copper, have a certain ductility, are easily deformed, and the copper has a large self-weight, making it unsuitable for many occasions. Graphite is not only structurally stable, but also has a lighter texture. In addition, the discharge rate of graphite can reach two to three times that of copper.

Graphite Electrode Rod For Steel Melting

Graphite Electrode Rod For Steel Melting

At the time of discharge, the graphite surface is also capable of releasing carbon atoms and forming a protective film, which greatly reduces the loss of the graphite material.

The melting point of copper is only about 1000 degrees Celsius, and graphite can be as high as nearly 4,000 degrees Celsius, which makes graphite materials also advantageous in processing, especially when making thin rib electrodes. Graphite has a much lower expansion coefficient and density than copper, so graphite can not only greatly reduce mechanical loss during processing, but also has a wider processing range. While saving a lot of manpower and material resources, it is also easier to achieve mechanization and modern production.

When the graphite electrode supplier selects graphite electrode materials, it is mainly based on four selection criteria. First, the smaller the particles of the graphite electrode material, the more uniform and stable the discharge is, so that a small particle graphite material is preferred in use. Secondly, the flexural coefficient of graphite electrode material is directly related to the strength of the material. For equipment and products with higher precision, the strength requirement is higher.

The Shore hardness of a graphite material is a standard value for measuring its hardness, and the hardness requirement varies depending on the demand. The higher the hardness of the graphite block, the smaller the discharge loss, but at the same time the processing equipment and cost requirements are higher. Finally, the inherent resistivity of the material is also a very important criterion. Under the same conditions, the higher the resistivity, the slower the discharge, and the direct application of the material.