MOLTEN METAL DISCHARGING DEVICE

摘要

PURPOSE:To obtain an ingot having a good surface characteristic without entailing the closing of passage holes by using porous refractories for the upper part and dense refractories for the lower part to constitute the refractories around the passage hole of a sationary plate. CONSTITUTION:A molten metal discharging device is constituted of the upper sationary plate 1, sliding plate 2 and lower sationary plate 3 which respectively have the passage holes for a molten steel. The body of the upper sationary plate 1 consists of the dense refractories and the circumference in the upper part of the passage hole thereof is the gas supplying refractories constituted of the upper porous refractories 4 and the lower dense refractories 5. A gas pressure equalizing body 6 is provided between such gas supplying refractories and the body of the upper sationary plate 1. The ratio of the height between the porous refractories 4 and dense refractories 5 to constitute the gas supplying refractories is designed to about 2:1 and after both refractories are simultaneously molded, the refractories are subjected to a tar impregnation treatment or caulking treatment.