Effect of complex electromagnetic stirring on inner quality of high carbon steel bloom

To obtain a better internal quality of high carbon steel bloom, complex electromagnetic stirring combined M-EMS with F-EMS was designed. In order to find a proper location for positioning the F-EMS stirrer, the solid shell thickness profile of a continuous casting bloom was computed. It was found that the F-EMS stirrer should be placed 11.39 m below the meniscus. Based on the finding, an industrial plant trial was conducted on the operating bloom casting machine at Baotou Iron and Steel (Group) Corp. The results show that the problem of inner porosity and composition segregation can be solved with the complex electromagnetic stirring technique. The ratio and index of central segregation and porosity can be reduced significantly. Therefore, good casting technique, optimum mould design and final electromagnetic stirring are all important for improving the inner quality of high carbon steel.