Abstract: A continuous casting apparatus comprises a mold and a tundish connected to each other by means of a refractory conduit capable of withstanding several cycles of casting operations. Used on the continuous-casting apparatus is a dummy bar assembly whose head is bevelled on both sides thereof adjoining the mold wall. The bevelled portions of the dummy-bar head and the mold wall define a gap expanding in the direction of the withdrawal of the ingot. A sealing material, such as asbestos string, is placed in the gap and tamped therein by a special means.