OBTAINING THE SPHEROIDAL GRAPHITE IN CAST IRON BY ELECTROLYSIS OF THE SLAG OF THE MGO–MGF2–CAF2–NAF SYSTEM IN THE ELECTROSLAG PROCESSING OF MOLTEN CAST IRON

The results of electrochemical research of the processes occurring in the molten metal-slag system during electroslag treatment of cast iron have been presented. It is established that electrolysis of slags is of practical importance for electroslag processing. Upon electroslag remelting at high current densities, electrolysis of slags allows for transfer of various (mainly alloying and modifying) elements into the metal from the slag. The role of electrolysis in the electroslag process has been shown. Author has proposed and implemented a new method of electrolysis, according to which, the surface of slag is isolated from the oxidizing atmosphere by the layer of carbonaceous materials. A method for producing high-strength nodular cast iron using electrolysis of slag containing magnesium oxides and fluorides has been suggested and tested. The possibility of obtaining the spheroidal graphite in cast iron by electrolysis of slag for the first time has been proved experimentally.