PURPOSE: To provide a steel ingot having no defects such as blow holes, central segregation, etc. by providing a pouring spout into a casting mold, casting a molten steel from a tundish through a nozzle and the pouring spout into the mold and moving horizontally the mold in a specified direction while adjusting the molten metal surface in the mold.
CONSTITUTION: The molten steel in a ladle 1 is received in a tundish 2 and is cast through a nozzle 3 and a pouring spout 4 into a casting mold 7. When the molten metal surface attains a prescribed height, a heat insulating material 14 is supplied onto the molten metal surface and the mold 7 is horizontally and gradually moved in a specified direction. The opening degree of the nozzle 3 is adjusted at the same time to control the rate of pouring, thereby maintaining the molten metal surface at a specified height. On the other hand, water is supplied to water cooling nozzles 12 below a molding board 8 to cool the board 8. When the length of the cast steel ingot attains a prescribed length, the movement of the mold 7 is stopped and at the same time the nozzle 3 is closed to end casting.
HASHIO MORINORI
OKAMOTO SETSUO
