Molten steel pouring nozzle

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 41/54 (2006.01) C04B 35/10 (2006.01) C04B 35/52 (2006.01) C04B 35/66 (2006.01)

Patent

CA 2104717

A molten steel pouring nozzle which comprises: a nozzle body comprising an alumina-graphite refractory, having, along the axis thereof, a bore through which molten steel flows; and an outer refractory layer arranged on an outside portion of the nozzle body so as to be integral with the nozzle body and to be flush with an outer surface thereof, the outer refractory layer being arranged on a portion of the outside portion of the nozzle body, which portion is in contact, when a lower portion of the molten steel pouring nozzle is immersed into molten steel, with the open air without being immersed into the molten steel, and -the outer refractory layer consisting essentially of: alumina (Al2O3) : from 40 to 75 wt.%, carbon (C) : from 10 to 30 wt.%, silica (SiO2) : from 1 to 30 wt.%, silicon carbide (SiC) : from 1 to 20 wt.%, and low-melting glass : from 1 to 10 wt.%.

Cette invention concerne une busette de coulée dont le corps en alumine-graphite réfractaire présente un alésage le long de son grand axe et comporte un revêtement réfractaire noyé dans une partie de sa surface extérieure, ladite partie étant en contact avec l'air ambiant lorsque l'extrémité inférieure de la busette de coulée est immergée dans l'acier fondu. Cette couche réfractaire extérieure se compose essentiellement : d'alumine (Al2O3), à raison de 40 à 75 % en poids; de carbone (C), à raison de 10 à 30 % en poids; d'oxyde de silicium (SiO2), à raison de 1 à 30 % en poids; de carbure de silicium (SiC), à raison de 1 à 20% en poids; et de verre à bas point de fusion, à raison de 1 à 10 % en poids.

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