The effect of position

diameter

inclination angle and elevation angle of retaining wall guide flow holes

dam and turbulence controller on average residence time and proportion of dead zone in a 32 t tundish for eight-strand casting has been studied with geometry similarity 1-3.5 water model and orthogonal test method. Test results show that the consistence of residence time with using optimized trapezoidal structure and V type structure of retaining wall is better than that of empty tundish and original tundish retaining wall structure； the effect of average residence time and proportion of dead zone with using V type retaining wall is better than that with using trapezoidal retaining wall； the comprehensive effect of trapezoidal retaining wall scheme with height of three flow guide holes- 500/300/400 mm

diameter of h

oles 80 mm

inclination angle 60°/65°/80° and elevation angle 0° is best. The commercial production test by desulphurized metal- 100 t top and bottom combined blown converter- LF- CC process indicated that with using the optimized V type retaining wall scheme the average total oxygen content in casting bloom decreases to 50. 5 X 10

-6

from 55. 6 x 10

-6

with original tundish.