Patent ID: 6425505
Filing Date: 2002-07-30
Classification: B22D

Abstract:
A pour tube for reducing alumina clogging in continuous casting of a stream of molten metal from an upstream position to a downstream position along a longitudinal center axis, the pour tube comprising an inner surface defining a throughflow bore between the upstream and downstream positions, the bore comprising a plurality of fluidly connected sections, where each section comprises:an inlet having an inlet cross-sectional area perpendicular to the center axis; a sharply converging step downstream of the inlet for directing the stream towards the center axis; a constriction downstream of the converging step having a constriction cross-sectional area perpendicular to the center axis; a slowly diverging portion downstream of the constriction for diffusing the stream, whereby turbulence is generated along the inner surface and alumina clogging is reduced; and an outlet downstream of the diverging portion having an outlet width and an outlet cross-sectional area perpendicular to the center axis.