The characteristics of liquid steel-slag interfacial profile and liquid field in mold with original nozzle for 304 stainless steel 200 mm × 1 550 mm slab have been studied by numerical simulation. Results show that in mold with original nozzle the upper returning flow is strong
led to liquid steel-slag interfacial profile unstable
thin slag layer at narrow side of mold
anil easier occurring slag entrapment and liquid exposed ; the optimum nozzle structure is to modify the V-type bottom of original nozzle to concave type
increase the taper of nozzle outlet with upward angle 10°.