Tiltable arc furnace

Arc furnace having a tiltable vessel whose interior is provided with an extension, the vessel including the extension having a bottom, there being a discharge opening in a portion of the bottom in the extension, the improvement comprising:

• the extension having a lined wall being a part of a lined wall and of an interior enclosing structure of the vessel and being a bay-like extension that is enclosed from above, from all sides as well as at the bottom in that the bottom of the vessel is continued into the extension but an interior of the extension being in unrestricted communication with the interior of the vessel, the vessel being higher than the bay-like extension, said extension providing for laterally unrestricted flow from the vessel interior towards the discharge opening;
• the bottom portion of the extension being substantially at the same level as the remaining portion of the bottom of the vessel except for a slight concavity in a central portion of the bottom of the vessel;
• the discharge opening being plugless in the interior of the vessel;
• and
• further including a closure plate linked to the bottom of the bay-like extension from the outside and provided for selective opening and closing of said discharge opening from the outside of the vessel.