The graphs below show the recommended values of current load on graphite electrodes by different grades and diameters. Operating conditions exceeding the recommended range for the grade concerned may cause increased electrode consumption depending on the individual furnace conditions. Not considering breakage loss for mechanical reasons, the consumption rate of electrodes depends primarily on electrical and thermal loads to which they are subject.
Consumption on the tip of the electrode results from the carbon sublimation (transition solid – gaseous) in the arc, lateral consumption (oxidation) is the consequence of the chemical reaction with oxygen. If, in practice, there is a high thermal loading, we recommend operation in the centre band of the electrical load range for electrodes as shown in the figure below as well as the application of our coated electrodes.