Molten steel pouring nozzle

B - Operations – Transporting – 22 – D

Patent

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Details

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

Patent

CA 2139372

A molten steel pouring nozzle having, along the axis thereof, a bore through which molten steel flows. At least part of an inner portion of the molten steel pouring nozzle, which inner portion forms the bore, is formed of a refractory consisting essentially of: zirconia clinker comprising calcium zirconate : from 40 to 64.9 wt.%, where, a content of calcium oxide in the zirconia clinker being within a range of from 8 to 35 weight parts relative to 100 weight parts of the zirconia clinker, graphite : from 10 to 35 wt.%, and calcium silicate: from 25.1 to 50 wt.%, where, a content of calcium oxide in the calcium silicate being within a range of from 40 to 54 weight parts relative to 100 weight parts of the calcium silicate.

Busette de coulée pour acier en fusion comportant, dans son axe longitudinal, un alésage permettant l'écoulement de l'acier liquide. Au moins une partie de l'intérieur de la busette de coulée, laquelle définit l'alésage, est formée d'un matériau réfractaire constitué essentiellement de mâchefer de zircone contenant du zirconate de calcium dans une proportion de 40 à 64,9 % en poids, une teneur en oxyde de calcium de l'ordre de 8 à 35 parties pour cent parties de mâchefer de zircone, du graphite dans une proportion de 10 à 35 5 en poids, et du silicate de calcium dans une proportion de 25,1 à 50 % en poids; la teneur en oxyde de calcium dans le silicate de calcium est de l'ordre de 40 à 54 parties pour cent parties de silicate de calcium.

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