Major improvements can be made in the recovery of the additives, and the addition times by improving the charging sequence.
As the molten level rises above the power coil, the stirring diminishes. This is more prominent especially in the case of medium frequency furnace. A carbon recovery of 85% to 95% is reported when the claimed petroleum coke is added along with the charge. The recovery runs down to 75% and below when added above the power coil. The precalculated additions of the master alloys thus should be done along with the charge. When the late additions are unavoidable, the melt level should be kept below the coil level so as to obtain stirring.