FIELD: ferrous metallurgy. SUBSTANCE: high temperature heaters are installed over the dome of open-heart furnace. Heater nozzles vertically enter through the dome into working space of the furnace. Heating members of the heaters may be made in the form of linear electric bulbs in heat-resistant sapphire shell or in the form of high temperature solid electric resistance heaters on the base of silicon carbide or molybdenum disilicide. The heaters may be connected to the feed system of oxygen or inert gas. EFFECT: open-heart furnace of high efficiency. 5 cl, 3 dwg
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