CASTING NOZZLE FOR STEEL MAKING

PURPOSE:To prevent the nozzle clogging arising from the alumina in a molten metal and the change of a casting speed by using a material which forms a low melting compd. by reacting with alumina to form the upper half of a casting nozzle for steel making where the flow rate is relatively low and usin...

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Bibliographische Detailangaben
1. Verfasser:	TATE MASAHISA
Format:	Patent
Sprache:	eng
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:	PURPOSE:To prevent the nozzle clogging arising from the alumina in a molten metal and the change of a casting speed by using a material which forms a low melting compd. by reacting with alumina to form the upper half of a casting nozzle for steel making where the flow rate is relatively low and using a heat resistant material to form the lower part thereof. CONSTITUTION:The upper half of the casting nozzle for steel making where the flow rate is relatively low and the fine Al2O3 in the molten steel is liable to deposit is formed of the CaO-MgO-Al2O3 refractories which form the low melting compd. by reacting with Al2O3. The lower half where the flow rate is high and Al2O3 does not deposit is formed of the alumina or zirconia refractories which are highly resistant to heat and wear and are free from the change of the pore diameter. Such combined nozzle prevents the nozzle clogging and the change of the casting speed and has therefore the longer life.