The mold liquid surface fluctuation

impact depth

distribution of flow field and powder covering condition with using original submerged nozzle (lower hole diameter 78 mm

side hole long axis 80 mm and short axis 66 mm) and with using optimized submerged nozzle of reduced hole dimension (lower hole diameter 65 mm

side hole long axis 75 mm and short axis 60 mm) for mold of 230 mm x 1 250 mm casting slab have been studied by using geometric similarity 1: 2 water model. Results show that in same working procedure condition with using optimized submerged nozzle the liquid surface fluctuation is more active

the thickness liquid slag layer is relative uniform

i. e. reducing side hole area of nozzle is available to increase the velocity of flow at outlet and favorable to melt the mold powder. By measured the thickness of liquid slag layer in mold for casting 230 mm x 1 250 mm slab of steel DP600 at steelworks the results show that with nozzle submerged depth 130 mm and steel flow rate 2. 8 t/min

by using the original nozzle the liquid surface in mold is less active and the difference of thickness of liquid slag layer in mold is 12 ~ 13 mm

but the liquid surface in mold is rather active and the difference of thickness of liquid slag layer is 3 〜5 mm by using optimized nozzle.