The structure characteristics of a special asymmetrical 12 strand 200 mm x 285 mm bloom 35 t tundish at steel works have been analyzed by geometric similarity 1:3 water model test

it is obtained that the nonsymmetrical degree and structure of original tundish are larger and unreasonable led to poor consistent in each strand and relatively poor whole body mixing effect

so the effect control flow device should be designed to improve its internal liquid flow. Water modelling test results show that by using the designed optimum scheme with relative larger impact region and two guide flow hole

the whole body mixing effect of tundish and consistence of each strand improve obviously

as compared with original tundish its total dead region ratio decreases from original 27.96% to 8.94% and the standard deviation of mean residence time of each strand decreases by 74%.