Optimization Of Tundish Structure In Four-Strand Billet Continuous Caster By Physical Modeling

There is deficiency on the quality of billets in the No.2 steel plant of Anyang Iron & Steel. Therefore the lumber recovery is low when rolled. To improve this situation and increase the quality of billets, after investigating by technicians, it is found that the higher content of inclusion in billets is the main reasons resulting in billet deficiency. Taking small billet into account, the effective measures to reduce inclusion are taken by optimizing the tundish structure.Using physical simulation, the flow field of tundish is systematically studied and the structure of tundish in the No.2 steel plant of Anyang Iron & Steel is optimally designed. According to the physical simulation of tundish for billets, the flow, mixing and residence of molten steel were researched. Based on improving the average residence time, the dam setting was optimized, the best design for the dam was determined and at the same time, the flow uniformity of nozzle in central and side sections was retained. After optimizing the flow control device, the average residence time was prolonged to about 37 seconds and the dead area ratio was decreased about 32%. In the end, the float behavior of the larger inclusions was simulated with polythene particles. The controlling effects on the fluid flow of various devices were analyzed. The optimization project was confirmed, that is, the critical height for tundish is more than 138mm at high casting speed.The calculation results were tested and analyzed in the practical operation, which showed that it is instructive for production in continuous casting. In 2005, the waste decrease by 2.1% and the economic performance is significant.