Study On Flow Field And Application On No.3 Billet Caster Tundish At Chonggang

In order to improve the continuous casting (CC) efficiency and satisfied the requirement of high qualitative products, In recent years, the metallurgist have taken a serious action on strengthening and enlarging the tundish metallurgical function. One of the important measures was that the appropriate flow control devices were installed to form the reasonable flow pattern, which not only made the inclusions well floated but also created the advantageous condition to uniform the liquid steel temperature and composition. In this paper, according to the fact of No.3 billet CC tundish at Chongqing Iron and Steel Company, the mathematical and physical simulation method were investigated to make certain the best flow control device.The experiment model, which was 1/3 of the prototype and was made of Plexiglas, was built and the experiments were done based on the Froude similarity by similarity principle. The mathematical model, describing the flow phenomena in the tundish, was established according as the continuity equation and momentum equation, meanwhile the FLUENT commercial software was used to calculate. It was found that the control flow devices had an important effect on the flow pattern in No.3 billet CC tundish by mathematical and physical simulation. The reasonable flow pattern was come into being and the metallurgical effect was fully exerted by setting the right control flow device. In the all of the flow control devices, the number 13 is the best one, which can effectively control inclusions motion and remove them to top surface, and uniform the temperature distribution for each strand. So, the case of No.13 was applied to No.3 billet CC tundish in Chonggang for industry producing. Based on the research, some operation parameters was set: the depth of melt in tundish was 740mm in the steady state, and the depth of melt in tundish must be keep above 67mm at the end of casting. During the ladle changing periods, the depth of melt in tundish was set to 400～735mm aim at different changing time (2～7min).