Estudo da otimização do perfil refratário do distribuidor para redução da perda metálica no processo do lingotamento contínuo da CSP

Abstract

At Companhia Siderúrgica do Pecém (CSP), the liquid steel that arrives to the continuous casting station to be turned into steel slabs, goes through the solidification process. However, not all the steel content of the teeming ladle becomes slab. In the interval between the steel arrival to the casting station to the moment it effectively becomes into slabs, some of the steel is lost in the process stages. The ratio between the steel volume that becomes slab and the volume of the liquid steel that arrives to the continuous casting is called continuous casting metallic yield. The yield loss in the Tundish is one of the main causes of metallic yield loss in the continuous casting. Therefore, understanding the causes and solutions for the metallic yield loss in this metallurgical reactor is of great interest to the steelmaking industry. At the end sequence in the continuous casting, a solidified steel mass, called tundish skull is discarded inside the tundish. It happens so to avoid vortex formation that takes place at a critical height above the tundish drainage nozzles . Votex produces entrapment of the steel slag and leads it to the mold. This event is both detrimental to the steel quality and to the process safety because it can lead to serious problems like strand breakouts in the continuous casting. Therefore, modify a metallurgical reactor like the tundish requires a great understanding of the correlations between the tundish and the liquid steel; the fluid flow behavior and the role of flow modifiers; the interaction between steel and slag inside the tundish; and the vortex formation phenomenon.