Effect of flow modifiers on liquid metal cleanliness in four-strand delta shaped billet caster tundish

Mathematical modelling was performed on a full scale aqueous model of a delta shaped four-strand billet caster tundish that is in operation at the RTIT (QIT) plant in Sorel-Tracy, Que., Canada. The tundish already uses a large and shallow impact pad designed by the McGill Metals Processing Centre (MMPC) and has proved to be quite successful. In the present study, 12 different combinations of flow modifiers were researched, each of which consisted of the standard impact pad (SIP) and two dams located in between the inner and outer strands. In addition, the size of the SIP was varied in four steps, and its performance was evaluated. The residual ratio of inclusion (RRI) was calculated for all 18 designs, and the best configuration was identified. Mathematically predicted RRI values were verified with existing water model data for a couple of designs.