With revamping such as advancing oxygen lances and using modifying process such as charging hot metal for 3 sets of 40 t arc furnace (transformer capacity 15 MVA/set)at Xincheng Special Steel
the tap to tap time of arc furnaces decreases to 60~70 min from original 3 h
electric consumption decreases to 160 kWh/t with oxygen consumption 50 m
3
/t
electrode consumption2.0 kg/t
and the annual output capacity of3 furnaces is up to 850000 t. The operation practice showed that the optimum economical index of 40 t arc furnace was got with 20~25 t hot metal charging per heat.