Physical And Mathematical Simulation On Tundish And Mould For Thin Slab Caster Of Ma Steel

It is necessary to know and control the steel flow pattern in the tundish and mold, which is the key point to assure higher efficiency continuous casting technology and improve the quality of the products. The physical and mathematical simulation methods were widely taken to research the rule of flow pattern. In the dissertation, according to the technical parameters (70×1600mm~2, 70×900mm~2, bloom section, 3.0～6.0m/min, casting speed) for tundish and mould of thin slab continuous casting in Ma'anshan Iron & Steel Group Co, different flow control devices for tundish, different submerged entry nozzles and Electromagnetic Braking (EMBr) for mould were designed to research the steel behavior. At the same time, based on the SMS'project, projects were given according to experiments. And the SMS'project about flow control devices and submerged entry nozzle parameters were evaluated. The influence of flow control devices of different sizes and installed positions on fluid flow in tundish of thin slab of Ma Steel were investigated by physical and mathematical simulation. Most methods were adopted to research the steel flow pattern, inclusion trajectories and fluid flow field with and without flow control devices. The result of physical and mathematical simulation showed: there were a short flow route and a large dead zone volume without flow control devices, the average residence time was shorter and the dead zone volume was larger when the flow control devices provided by SMS(case 17) was used. The simulative result of case 5 was the best according to all experiment targets. The measured results of the surface fluctuating, impacting pressure, impacting depth and covering of flux were analyzed through water simulation for nozzles. The results were validated and supplemented by mathematical simulation using the software FLUENT. It was found that the case 5 could satisfy all of the experimental targets. With EMBr technology mold slag entrapment can be reduced and the internal quality of strands can be improved, so the results of flow field distribution were simply discussed with EMBr at last, which can be the foundation of systemic research on flow pattern in mold with different technical parameters when EMBr is used.