Abstract: By simplifying reasonably the heat transfer boundary conditions of molten pool in twinroll strip casting， the temperature field model of molten pool was deduced by thermal balance method. The effects of casting temperature， casting speed， gap and casting rolls temperature on molten pool temperature field were considered in the model. The model’s computing speed and accuracy satisfied the requirement of realtime online control. The main factors that affect the molten pool were discussed based on the calculation results and the online control rules in twinroll strip casting were obtained. The correctness of model was verified in twinroll strip casting experiments.

Key words: twinroll strip casting, molten pool, temperature field, casting speed, solidification end point