C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
39/104, 53/75, 2
C21C 7/00 (2006.01) B22D 11/10 (2006.01) B22D 11/119 (2006.01) B22D 41/00 (2006.01) B22D 43/00 (2006.01) C22B 9/05 (2006.01)
Patent
CA 1285773
ABSTRACT PURIFYING STEEL A method of purifying steel in a tundish, especially to remove alumina inclusions. comprises passing the steel through at least one refractory board having apertures through it and introducing inert gas into the steel at the upstream side of the foot of the board to cause a stream of bubbles to flow over the upstream side of the board. One of the boards may comprise a ceramic filter element. The boards may be non-vertical and have integral gas supply means. The apertures may taper, may have axes angled from perpendicular to the board's plane and may have high alumina content surfaces. The upstream side of the board may have an exothermic layer.
530990
Foseco International Limited
Gowling Lafleur Henderson Llp
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