'AN IMPROVED SUBMERGED ENTRY NOZZLE ASSEMBLY FOR DELIVERING MOLTEN STEEL BETWEEN A TUNDISH AND A MOLD IN A CONTINUOUS CASTING PROCESS

摘要

Slag entrapment in the mold is one of the major causes of macro nonmetallic inclusions in steel which arises from the disturbances at the melt free surface (meniscus) in the mold. Again appropriate surface flow velocity in mold is required during the casting process because the mold level should keep stable and the covering slag cover well. There are continuous demands for the improvement of the submerged entry nozzle structure to achieve a more desirable flow pattern in the mold. The novel submerged entry nozzle design of the present invention is adapted to reduce turbulence and mold disturbances, thereby producing a more stable, uniform outflow, which will play vital role in reducing the nonmetallic content and inclusions in the casting.