Dispensing – Molten metal dispensing – With subjacent flow guide
Patent
1997-04-07
1998-07-07
Kastler, Scott
Dispensing
Molten metal dispensing
With subjacent flow guide
222606, 164437, B22D 1110
Patent
active
057755523
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an pouring spout or a submerged nozzle for delivering molten steel into a continuous casting mold with longitudinal and transverse sides, especially for casting thin slabs, which is connected at one end to a casting vessel and at the other end extends so far into the mold that its opening is immersed during casting into the molten steel in the mold.
2. Description of Related Art
Typically, pouring spouts have a round, substantially circular or elliptical shape at their connection to the casting vessel. This shape may continue to the opening region of the pouring spout or may change into a different shape, for example, a rectangular shape. For example, a pouring spout is known and described in German patent publication OS 24 42 187 in which at least the section that is immersed into the melt has substantially rectangular outer and inner cross-sections. The longitudinal edges of this pouring spout are parallel to the longitudinal sides of the continuous casting mold, so that, particularly in the case of rectangular strand cross-sections, an optimal space is used for the flow cross-section.
The flow cross-section that is available between the transverse side of the mold and the outer wall of the pouring spout in the case of normal slabs does not exist in molds for manufacturing thin slabs. Furthermore, given the casting outputs required today, the molten steel fed through the pouring spout is supplied at significantly higher casting speeds than were usual for the mold described in the patent. The flow of molten steel is so great that distinct bath surface movements occur, especially in the region between the pouring spout and the longitudinal sides of the mold.
It is known from WIPO patent publication 89/12519 to use pouring spouts whose section for immersion into the melt is shaped like a flattened tube with side walls that run parallel to each other. This wide-mouthed spout section has openings that, alone or together with flow guiding elements, guide the outflow of molten steel from the pouring spout so that individual streams of molten metal intersect each other and thus reduce the flow.
In addition, a pouring spout for introducing molten steel into a mold is described in patent publication 41 42 447 C2 in which the inner wall of the section where the spout cross-section expands and the wall sections opposite thereto of the bottom piece together form flow channels. This pouring spout exercises an influence on the melt that flows through it, and in particular, on the emergence impulse of the casting stream.
When pouring spouts in known shapes are used, the flow of steel creates turbulence and whirlpools, especially in the corner areas in the transverse-side region of the mold. As a result, wave crests and valleys occur in the longitudinal-side region of the pouring spout. The disadvantageous consequence is an uneven supply of slag in the region of the free mold cross-section in the shadow of the pouring spout. This leads to uneven lubrication and irregular heat transfer between the strand shell being formed from the molten steel and the mold wall, which in turn results in slag and casting powder being drawn below the bath surface.
The object of the present invention, therefore, is to provide a pouring spout with a simple design which; breaksdown the Kinetic energy of the molten steel in the region between tile section of the spout immersed into the melt and the longitudinal sides of the mold and to influences in a predeterminable manner the flow formation of the molten steel in the mold in the region of the bath surface.
SUMMARY OF THE INVENTION
The present invention relates to a pouring spout or submerged nozzle for delivering molten steel into a continuous casting mold with longitudinal and transverse sides, particularly for casting thin slabs, which is connected at one end to a casting vessel and at the other end extends so far into the mold that, during casting, the mouth is immersed into the molten steel in the
REFERENCES:
patent: 5402993 (1995-04-01), Hofmann et al.
patent: 5603860 (1997-02-01), Hohenbichler
Kastler Scott
Mannesmann Aktiengesellschaft
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