An impact pad for eliminating surface turbulence in a continuous caster tundish, the impact pad having a base for receiving an incoming ladle stream, and one or more sidewalls extending in an upward direction along the periphery of the base. Each upward extending sidewall includes an inner surface having an undercut portion facing the incoming ladle stream. And, each undercut portion extends along the length of the inner surface, and comprises a shaped surface for receiving and reversing the direction of a fluid flow generated by the incoming ladle stream.

Impact pad for a continuous caster tundish

The impact pad (10) comprises a body of refractory material capable of withstanding contact with molten steel in a tundish, the body comprising a base (12) having an impact surface (13), an outer sidewall (14) extending upwardly from the impact surface (13), an annular portion (15) providing a top surface (16) substantially parallel to the impact surface (13) and connected to the sidewall (14) and defining an opening (11) into the pad, the lower face (17) of the annular portion (15), the inner face (18) of the sidewall (14) and the upper surface (19) of the base (12) adjacent the sidewall (14) together providing a continuous curved surface, which surface adjacent its lower end defines a trough (20) around the perimeter of the impact surface (13) of the base (12).

Tundish impact pad

A tundish and, more specifically, an impact pad is formed with a bottom impact surface and includes an outer side wall extending upwardly therefrom which fully encloses an interior space or cavity having an upper opening into which molten metal is directed from a ladle shroud. The outer side wall of the pad includes an inner surface extending from the bottom impact surface to the opening of the pad. The inner side wall surface includes an annular portion which extends inwardly and upwardly toward the opening of the pad. In the preferred embodiment, the inner side wall surface curves continuously from the bottom impact surface to a vertical wall defining the opening of the pad. The pad redirects the pouring stream back into itself causing the counter current flows to slow each other down thereby minimizing turbulence and inhibiting high velocity flow within the tundish. The upward flow is further is advantageously directed away from the incoming pouring stream toward the surface of the bath.

Turbulence inhibiting tundish and impact pad and method of using

A tundish impact pad is provided for use in a tundish vessel. The impact pad has a wavy upper surface which significantly reduces the horizontal surface area in the region of impact where molten iron or steel enters the tundish vessel. This wavy surface substantially reduces the vertical splashing of molten iron or steel entering the vessel, causing a significant reduction in agitation and turbulence within the vessel. The impact pad may exist as a discrete structure or may form an integral part of the structure of the tundish vessel.

A tundish (10) and, more specifically, an impact pad (20) is formed with a bottom impact surface (24) and includes an outer side wall (28) extending upwardly therefrom which fully encloses an interior space or cavity (29) having an upper opening (30) into which molten metal (34) is directed from a ladle shroud (18). The outer side wall (28) of the pad (20) includes an inner surface (28a, 28b) extending from the bottom impact surface (24) to the opening of the pad (20). The inner side wall surface includes an annular portion (28b) which extends inwardly and upwardly toward the opening (30) of the pad (20). In the preferred embodiment, the inner side wall surface (28a, 28b) curves continuously from the bottom impact surface (24) to a vertical wall (30) defining the opening of the pad (20). The pad (20) redirects the pouring stream (34) back into itself causing the counter current flows (34, 36) to slow each other down thereby minimizing turbulence and inhibiting high velocity flow within the tundish (10). The upward flow (36) is further advantageously directed away from the incoming pouring stream toward the surface of the bath (16).

Turbulence inhibiting tundish and impact pad

A continuous caster tundish having refractory wall dams formed as part of a portion of the lining of the interior of the side walls, where each refractory wall dam is characterized by a flange projecting substantially horizontally inwardly to prevent turbulent surface flow as molten metal is poured into the tundish.

Continuous caster tundish having wall dams

This invention is directed to a system for reducing the yield loss from a metallurgical vessel, such as a ladle holding liquid metal having a slag layer thereon, by delaying the onset of slag entrapment in the metal stream during the tapping thereof. More particularly, such system includes a modification to the drain hole and/or bottom of such vessel.

Drain hole design for ladle

Flow control apparatus for enhancing inclusion float out in a continuous caster tundish comprising a dam positioned downstream from an impact pad and an energy source positioned between the dam and the exit nozzle of the tundish. The dam receives an incoming flood of molten metal released from the impact pad and redirects the flood of molten metal into multiple sub-flow currents which carry entrained inclusions toward a slag cover on the surface of the molten metal bath to enhance inclusion float out. The energy source provides means to restore kinetic energy to the sub-flow currents and increase the number of passes below the slag cover, thereby further enhancing inclusion float out.

Apparatus for controlling molten metal flow in a tundish to enhance inclusion float out from a molten metal bath

Disclosed is a tundish apparatus for holding and filtering molten metal, such as steel, prior to the molten metal being continuously cast. An enclosure around the discharge orifice of the tundish accommodates a ceramic filter medium. The enclosure has a removable cover plate to allow continuous discharge of the molten metal in the event the filter medium becomes clogged and to allow access to the tundish nozzle.

Manfred Schmidt

Papers

Impact pad for a continuous caster tundish

Continuous caster tundish having wall dams

Drain hole design for ladle

Apparatus for controlling molten metal flow in a tundish to enhance inclusion float out from a molten metal bath

Metallurgical tundish with filter