Method of continuous casting

A method for automatic pouring of molten metal between a ladle and a tundish, said tundish is provided with a level detector, and employing circuit means designed for feedback of signals supplied from the level detector, said ladle including a rotary opening and closing means together with a plurality of large and small diameter nozzles, and control means for controlling said rotary opening and closing means through feedback signals from said circuit, automatically selecting a small diameter nozzle when the molten metal level in the tundish exceeds an upper level, and automatically selecting the larger diameter nozzle with full opening when said lever has lowered to below a lower level, selection of said respective nozzle diameters being responsive to signals received from said level detector;

• comprising the steps of:
• employing a plurality of pouring nozzles with at least one of a first nozzle having a pouring rate at full opening larger than the rate necessary for maintaining a reference level in a tundish and at least one of a second nozzle from the first nozzle to provide a pouring rate at full opening smaller than a rate necessary for maintaining a reference pouring rate, selectively controlling said pouring nozzles by full opening or closing in response to the level of molten metal in the tundish and selecting from a plurality of pouring nozzles of different diameters, a large nozzle having a pouring rate at wide open pouring greater than that required to maintain said reference level, and a small nozzle having a pouring rate at wide open pouring slightly greater than that required to maintain said reference level during an initial pouring period, said small nozzle pouring rate becoming, after said initial period smaller than that required to maintain said reference level and switching back and forth for a plurality of times, each of said respective nozzles during the pouring cycle.