Continuous casting tundish and assembly
First Claim
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1. An assembly for the continuous casting of molten metal containing liquid lead and wherein said liquid lead is denser than the rest of the molten metal, said assembly including a tundish and comprising:
- a metal tundish shell having a bottom and an opening in said bottom;
a refractory material lining the interior of said shell bottom to form a tundish interior bottom;
a vertically disposed nozzle element separate and discrete from said shell and said lining and extending through said lining material and said opening in the shell;
said tundish having a pair of sidewalls and a pair of endwalls;
an elongated dam resting atop and extending across the interior bottom of said tundish between said pair of tundish sidewalls, said elongated dam being located upstream of said nozzle element;
said dam comprising means for accumulating liquid lead on the upstream side of said dam;
and pressure-relieving means on said dam, for relieving the pressure head of the molten metal on said liquid lead accumulating on the upstream side of said dam to prevent the lead from being squeezed underneath the dam to the downstream side of the dam;
said pressure-relieving means comprising a drain hole located slightly above the highest level at which said liquid lead will accumulate on said upstream side of the dam;
the walls of said tundish having a containment height for containing molten metal having a depth of at least 600 cm;
the ratio of drain hole height on the dam to said containment height of the tundish walls being no greater than about 10/600.
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Abstract
A tundish and associated assembly are employed for the continuous casting of molten steel containing lead. Undissolved lead can accumulate at the bottom of the tundish, work its way through the refractory material lining the tundish interior bottom and weep through the metal tundish shell bottom into a casting mold located below the tundish, which is undesirable. Expedients are provided to minimize such lead weeping.
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Citations
2 Claims
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1. An assembly for the continuous casting of molten metal containing liquid lead and wherein said liquid lead is denser than the rest of the molten metal, said assembly including a tundish and comprising:
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a metal tundish shell having a bottom and an opening in said bottom; a refractory material lining the interior of said shell bottom to form a tundish interior bottom; a vertically disposed nozzle element separate and discrete from said shell and said lining and extending through said lining material and said opening in the shell; said tundish having a pair of sidewalls and a pair of endwalls; an elongated dam resting atop and extending across the interior bottom of said tundish between said pair of tundish sidewalls, said elongated dam being located upstream of said nozzle element; said dam comprising means for accumulating liquid lead on the upstream side of said dam; and pressure-relieving means on said dam, for relieving the pressure head of the molten metal on said liquid lead accumulating on the upstream side of said dam to prevent the lead from being squeezed underneath the dam to the downstream side of the dam; said pressure-relieving means comprising a drain hole located slightly above the highest level at which said liquid lead will accumulate on said upstream side of the dam; the walls of said tundish having a containment height for containing molten metal having a depth of at least 600 cm; the ratio of drain hole height on the dam to said containment height of the tundish walls being no greater than about 10/600.
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2. An assembly for the continuous casting of molten metal containing liquid lead and wherein said liquid lead is denser than the rest of the molten metal, said assembly including a tundish and comprising:
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a metal tundish shell having a bottom and an opening in said bottom; a refractory material lining the interior of said shell bottom to form a tundish interior bottom; a vertically disposed nozzle element separate and discrete from said shell and said lining and extending through said lining material and said opening in the shell; said tundish having a pair of sidewalls and a pair of endwalls; an elongated dam resting atop and extending across the interior bottom of said tundish between said pair of tundish sidewalls, said elongated dam being located upstream of said nozzle element; said dam comprising means for accumulating liquid lead on the upstream side of said dam; and pressure-relieving means on said dam, for relieving the pressure head of the molten metal on said liquid lead accumulating on the upstream side of said dam to prevent the lead from being squeezed underneath the dam to the downstream side of the dam; said pressure-relieving means comprising a drain hole located slightly above the highest level at which said liquid lead will accumulate on said upstream side of the dam; said drain hole being located 3-10 cm above said tundish interior bottom.
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Specification
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Current AssigneeISG Technologies, Inc. (International Business Machines Corporation)
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Original AssigneeInland Steel Company (ArcelorMittal SA)
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InventorsMastervich, Joel C., Pielet, Howard M., Kreevich, William J., Knoepke, John R., Moscoe, Gerald F., Glennon, Roger J., Rellis, Daniel Jr.
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Primary Examiner(s)Seidel, Richard K.
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Application NumberUS07/263,363Time in Patent Office306 DaysField of Search164/134, 164/337, 164/437, 164/488, 164/490, 222/591, 75/46, 75/53, 75/51.7US Class Current164/437CPC Class CodesB22D 11/10 Supplying or treating molte...B22D 11/118 by circulating the metal un...C21C 7/04 Removing impurities by addi...
