Immersion nozzle
AssigneeToshiba Ceramics Co., Ltd.
InventorsHiroshi Ohtsuka, Etuhiro Hasebe, Kouji Enomoto
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Abstract
The invention presents an immersion nozzle having corrosion resistance to steel of high oxygen content or type of steel treated with calcium, and capable of preventing adheres and deposits of molten steel and oxide inclusions on the nozzle inner wall, in which at least a part of its portion contacting with molten steel is composed of a refractory material containing 50 wt. % or more of a principal component including one or more types of magnesia, alumina, spinel, zirconia, mullite, and silica, and also 0.3 to 15 wt. % of boron nitride, and an organic binder.
Claims6
An immersion nozzle comprising at least one surface for contacting molten metal wherein at least a portion of said surface consists essentially of a refractory material and wherein said refractory material consists essentially of an organic binder, 80 to 90 weight % of one or more of magnesia, alumina, spinel, mullite and silica, and also 0.3 to 15 weight % of boron nitride.
Dependencies are inferred from the claim text.