The bubbles movement behavior in mold with cast speed 1.1 m/min

nozzle submerged depth 160 mm and gas flow rate in nozzle 0～15 L/min

and the effect of bubbles movement on impact depth

liquid level fluctuation and surface naked of mold powder have been studied by physical model in the ratio 0.4 to 1300 mm × 230 mm slab mold. Test results showed that with increasing gas flow rate in nozzle all the amount and size of bubbles in mold increased

the bubbles horizontal dispersion in liquid steel enlarged and the bubbles maximum penetration depth increased; as the gas flow rate in nozzle increased to 5 L/min

the flow pattern of gas bubbles at liquid surface changed from all movement towards nozzle to dispersion movement at the concentration escape position.