SUBMERGED ENTRY NOZZLE FOR FORMING MULTIPLE MOLTEN STEEL FLOWS

摘要

PURPOSE: A submerged entry nozzle for forming multiple molten steel flows is provided to reduce stagnation zone of molten steel by improving fluidity of molten steel in such a way that different up flows are generated in central part and side surface of flow of molten steel supplied through the submerged entry nozzle. CONSTITUTION: In a submerged entry nozzle(4) for injecting molten steel into mold from tundish in the continuous casting process, the submerged entry nozzle for forming multiple molten steel flows is characterized in that a discharge port(5) is formed at a lower part of the submerged entry nozzle in such a shape that a central part(9) of the lower surface of the discharge port has an upward inclination angle, and a side surface part(10) at left and right sides of the central part of the lower surface of the discharge port has an upward inclination angle steeper than the inclination angle of the central part of the lower surface of the discharge port so that the lower surface of the discharge port of the submerged entry nozzle is formed in multistep, wherein the upward angle of the side surface part of the discharge port of the submerged entry nozzle is 5 degrees larger than the upward angle of the central part of the discharge port of the submerged entry nozzle, wherein the central part of the discharge port of the submerged entry nozzle is formed to an upward angle of 5 degrees, and the side surface part formed at both sides of the central part of the discharge port of the submerged entry nozzle is formed to an upward angle of 10 degrees, and wherein the discharge port of the submerged entry nozzle is getting widened as it goes from the center to the outer side of the discharge port.