CONTINUOUS CASTING METHOD OF HOLLOW ROUND BLOOM

摘要

PURPOSE:To cast continuously and efficiently a hollow round bloom by using a free-cutting steel pipe as a core, casting simultaneously a molten steel to cast continuously the bloom together with said core by an insert-casting method then machining away the core thereby removing quickly the core. CONSTITUTION:The molten steel in a ladle 8 is cast through a tundish 6 and an immersion nozzle 9 into a casting mold 3. The free-cutting steel pipe is at the same time supplied as the core 2 under the tension exerted thereto by tension rolls 4 to the casting mold 3 while said pipe is welded by a core connector 5 consisting of flash butt welding machine. The continuous casting of the insert-casting method is thus executed. The billet drawn from the mold 3 by pinch rolls 7 is cut to a prescribed length by a torch 10 and the insert-cast core 2 is machined away after cooling. The hollow round bloom 1 is thus efficiently and continuously cast and the consumption of the tool for machining is decreased.