IMMERSION NOZZLE FOR CONTINUOUS CASTING OF STEEL AND METHOD FOR CONTINUOUS CASTING OF STEEL USING THE IMMERSION NOZZLE

摘要

A nozzle for continuous casting of a clean steel capable of eliminating the adhesion of Al2O3 inclusions to the wall surface of a nozzle inside hole and sufficiently developing the effect of a swing vane as a measure against the drift of molten steel flow flowing down in the nozzle inside hole in the continuous casting of molten steel. The nozzle is formed of a refractory manufactured by controlling a CaO/MgO weight percent and an apparent porosity, and the swing vane is installed in the inside hole in which an inner layer of 3 to 20 mm in thickness is formed as an annular refractory. Thus, the adhesion of Al2O3 inclusions to the wall surface of the inside hole and the swing vane can be effectively prevented and the drift of the molten steel can be effectively prevented over a long period. Since inert gas is jetted between the upper nozzle and the upper position of the swing vane, the mixing of Al2O3 inclusions into the molten steel can be suppressed by promoting the rise of the inclusions to stably perform the operation and provide excellent highly clean steel quality.