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A molten steel pouring nozzle having along the axis thereof an inner bore through which molten steel flows. At least a part of the molten steel pouring nozzle is formed with a refractory consisting of at least 30 wt.% calcium oxide and at least one of magnesium oxide and aluminum oxide such that the...

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Bibliographische Detailangaben
1. Verfasser:	MASAHISA TATE
Format:	Patent
Sprache:	ita
Schlagworte:	ARTIFICIAL STONE CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA METALLURGY PERFORMING OPERATIONS POWDER METALLURGY REFRACTORIES SLAG TRANSPORTING TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	A molten steel pouring nozzle having along the axis thereof an inner bore through which molten steel flows. At least a part of the molten steel pouring nozzle is formed with a refractory consisting of at least 30 wt.% calcium oxide and at least one of magnesium oxide and aluminum oxide such that the melting point of the refractory falls within the region of at least 2,200 DEG C in the CaO-MgO-Al2O3 ternary phase diagram. In use, deposition of Al2O3 from the steel on to such a refractory results in a reaction between the refractory and the deposit, leading to production of low-melting point products which readily dissolve in the steel. Thus, the nozzle does not become clogged. Further, if the nozzle is installed as a flow-regulator in a weir of a tundish, the low-melting point product floats to the surface in the tundish thus making it possible to remove Al2O3 from the steel.