連続鋳造モールド内浸漬ノズル近傍でのモールドパウダー巻き込みに及ぼす浸漬ノズルの濡れ性の影響

抄録

Mold powder entrapment in a continuous casting mold is harmful for producing clean steel. As the immersion nozzle is poorly wetted by molten steel in the real processes, the effect of the surface wettability of the nozzle on the descent of mold powder due to pressure difference along the nozzle was investigated in this model study. Concerning a poorly wetted immersion nozzle, mold powder descended most deeply on the surface of the nozzle, while for a highly wetted immersion nozzle the deepest mold powder-molten steel interface appeared at a position away from the nozzle. The poorly wetted immersion nozzle promoted the descent of mold powder significantly compared with the highly wetted immersion nozzle. Accordingly, the mold powder would be more entrapped at the ports of the poorly wetted nozzle. An empirical equation was proposed for the descent of the mold powder.