2008 Volume 48 Issue 1 Pages 28-37
In this study, the steel grade transition during the ladle change in a continuous casting process is simulated by presenting a new mathematical model. First, the mixing process in a non-isotherm tundish is investigated by a water modeling system. Then, heat transfer mechanisms and solidification process are simulated for a continuous casting machine and the geometric shape of the liquid pool is predicted considering different conditions. The mixing process in the liquid pool of strand is also investigated by a mixing model. Finally, when the solidification process in the strand is completed, the variations of chemical composition in the final product are calculated. To verify the results of the intermix model, several samples are taken from the different positions of the slab and chemical composition of several elements are measured using a spectrometry technique. The model results show that the weight of mixed grade steel are affected by parameters such as molten steel volume in the tundish at the time of new ladle opening, slab dimensions, rate of casting and non-isothermal effect on the tundish. The obtained results also show that the effect of mixing process on the extent of mixing regions in the liquid pool of strand is more significant than the mixing in the tundish.