Study On Tundish Configuration Optimization In Bloom Continuous Casting

Using law of similarity as the academic base, physical modeling and industrial application have been carried out in the 4-strand bloom tundish in Angang New Steel Co., Ltd by made a tundish model in the lab and at the steelmaking plant of the company, respectively.According to geometric dimensions of the original tunidish, a 1:2.5 scale model was made in the laboratory. Experiments were conducted under the condition of a constant Re between the original tundish and the model. From the experiments, different flow parameters can be obtained in tundishes with different configuration by measuring the liquid flow residence time distribution curves. The results showed a big difference existed between the flow parameters in the two strands lacated in the same side of the original tunidsh. Compared with the inner strand, the outer one had lower minimum residence time, peak concentration time and plug volume fraction, and larger dead zone volume. By adopting the optimized turbulence inhibitor and two newly designed baffles as the tundish flow control devices, the liquid flow parameters can be improved. In addition, the flow characteristics of the outer and the inner strands were nearly the same. The different value of the minimum residence time, peak concentration time and average residence time between the outer strand and the inner one were 1,0 and 18 seconds, respectively.The industrial application results showed that by using the optimized tundish configuration, the size of the inclusions were reduced, and 90 percent of them were less than 10μ m. The results also showed that the turbulence inhibitor could reduce the quantity of the external inclusions. The average inclusion removal degree was increased from 51.25% to 73.46%.