IMMERSION NOZZLE FOR CONTINUOUS CASTING

摘要

An immersion nozzle for continuous casting is adapted to discharge molten steel into a mold for continuous steel casting and has a tubular nozzle body which is provided with four molten steel discharge ports consisting of left upper, left lower, right upper and right lower ports which open into a lower end portion of the nozzle body to be immersed into the molten steel in the mold. The two left discharge ports and the two right discharge ports have substantially symmetrical shape with respect to an axis of the nozzle. The left discharge ports are opposed to the inner wall of the left minor side of the mold and the right discharge ports are opposed to the inner wall of the right minor side of the mold. The area of the openings of the lower discharge ports is smaller than the area of the openings of the upper discharge ports. The ratio of the area of the openings of the lower discharge ports to the area of a sum of the areas of the openings of the upper and lower discharge ports is not less than 0.2 but not more than 0.4.