Multi-stepped submerged nozzle for continuous casting
AssigneeShinagawa Refractories Co., Ltd.
InventorsYasutoshi Nanba, Kozo Kanamaru, Yukinobu Kurashina
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Abstract
The nozzle for continuous casting has a plurality of steps in the molten steel pouring hole of the nozzle. The dimension of the inside diameters of the steps to the inside diameter d of the main pipe is d.sub.1 >d.sub.2 >d or d.sub.1 >d.sub.2 d.sub.3 >d, the inside diameter d.sub.2 or d.sub.3 immediately above the molten steel pouring outlet is d+10 mm.gtoreq.d.sub.2 or d.sub.3, and the material of the inner peripheral wall near the pouring outlet is boron nitride-carbon.
Claims6
A multi-stepped submerged nozzle for continuous casting comprised of a molten steel pouring hole having a main pipe with an inside diameter d and a molten steel pouring outlet at the bottom of the nozzle characterized in that a plurality of steps having inside diameters d.sub.1 -d.sub.n are provided in the molten steel pouring hole, the dimension of the inside diameters of said steps to the inside diameter d of the main pipe is d.sub.1 >d.sub.2 >d.sub.3 . . . d.sub.n >d, and the inside diameter d of the main pipe is provided in the respective spaces between said steps d.sub.1 -d.sub.n.
Dependencies are inferred from the claim text.