Study On Liquid Steel Behavior In Tundish And Mould For 6-Strand Bloom Continuous Caster

With the development and optimization of the continuous casting (CC) technology, the requirement of quality for the ingot or casting become higher and higher, which is mainly affected by nonmetal inclusion. It was researched that the large-scale inclusion mostly roots in tundish,the measure should be taken to effectively control the nonmetal inclusion and avoid the inclusion entering into mould and removed finally. Mould is the heart of the caster, many nuclear technologies were applied in mould and correlative equipment. It is necessary and essential to know and control the steel flow pattern in the tundish and mould, which is the key point to assure higher efficiency CC technology and improve the steel products' quality. The physical and mathematic simulation methods were widely taken to research the rule of flow pattern. In the article, the different flow control devices for tundish and different immerging nozzle and EMS for mould was designed to research the steel behavior, according to the technical parameter (280×380mm2, 280×325 mm2, bloom section, 0.8m/min, casting speed) for six-strand bloom CC Tundish and mould of Panzhihua Iron & Steel Group Co.Because the natural convection has an important effect on the fluid flow in CC tundish, it should be considered when doing water model and mathematical simulation for fluid flow and inclusion removal in tundish of Panzhihua Iron & Steel Group Co. The non-isothermal condition was adopted to research the steel flow pattern, temperature pattern, inclusion pattern and flow field with and without flow control devices. The generalized "F" curve was tabled through experiment. The temperature field was discussed through multi-point measured. It is necessary to install the flow control devices with the non-isothermal condition by contrasting the steel behavior with isothermal and non-isothermal condition. On this condition, the case 4 of"V" weir and dam was chosen, which was satisfied the entire experimental index. The measured results of the surface fluctuating, impacting pressure, impacting height, and covering of flux and were analyzed through making the water model simulation. The results were validated and supplemented by mathematical simulation using the FLUENT software. It was found that the case 6 of straight channel nozzle and case 11 of four holes (up) nozzle were chosen, which were satisfied all of the experimental requirements . The EMS technology was widely adopted, which can improve the concreting structure of ingot or casting, restrain the form of columnar crystals, make the ingredient uniformity, have the inclusion even distributing, advance the quality of ingot or casting, and reduce the defect- the central shrinkage, the central segregation, the central contraction cavities etc. The results of flow field and temperature distributing were simply discussed with EMS, which were the foundation for systemic research on different technical parameter with EMS. On the basis of foregoing experiments, the sound flow control devices and immerging nozzle were designed, which were the premise of industry experiment and application.