Dispensing – Molten metal dispensing – Flow controllers or assists
Patent
1997-09-22
1999-06-29
Kastler, Scott
Dispensing
Molten metal dispensing
Flow controllers or assists
222606, B22D 4150
Patent
active
059164727
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE PRESENT INVENTION
The present invention is directed to an immersed outlet (also referred to as an immersion casting pipe or an immersion nozzle) for casting metal, especially steel, in plants for the continuous casting of thin slabs, with a pour-in part which is fastened at a pour-in or casting vessel and which has a circular cross section, and with a pour-out part which dips into the melt located in a rectangular mold, the mouth of the pour-out part being rectangular in cross section.
BACKGROUND OF THE INVENTION
An immersion nozzle, especially for casting thin slabs, is known from EP 0 630 712. This immersion nozzle is divided into two portion, and the length of its lower shaped brick is substantially greater than its width. The individual portions are formed by separate shaped bricks, wherein the shaped bricks engage in one another at their ends which face one another and a seal is arranged between the meshing ends of the shaped bricks.
The individual shaped bricks have a complicated shaped construction with distinct differences in wall thickness.
DE 37 09 188 A1 likewise discloses a pour-out pipe for metallurgical vessels. The upper longitudinal portion of the pour-out pipe is round in cross section and its lower longitudinal portion is rectangular in cross section. The dimensions in the mouth region have a length-to-width ratio of 20:1 to 80:1. The outlet of the immersion casting pipe is formed by two mouth openings which together have a flow cross section which is not quite as large as the flow cross section at the stopper end.
A ratio of less than 1:1 between the flow cross section in the inlet pipe and at the outlet of the immersion casting pipe is achieved by flow deflection and by narrowing two mouth openings.
SUMMARY OF THE INVENTION
The object of the invention is to provide an immersion nozzle which is easy to manufacture, has a long life, has a construction which is resistant to thermal stresses with respect to manufacture and operation, and enables the liquid metal to flow out in a uniform manner.
The immersion nozzle is constructed from two basic structural component parts, namely a tubular pour-in part and a rectilinear or straight-surface pour-out part. Provided between these two basic structural component parts, which are completely different from one another with respect to shape, is a transition of short overall length.
Surprisingly, transition has virtually no effect on the flow behavior of the liquid steel flowing through the immersion nozzle insofar as the pour-out part is formed from plane-surface wall elements and has a free cross-sectional area which is less than half of the cross-sectional area of the pour-in part.
Regardless of the shape of the transition from the tubular pour-in part to the rectangular pour-out part, the flow of molten steel can be conducted so as to be completely calm insofar as the plane-surface wall elements are arranged virtually parallel to one another.
As a result of the simple shaped elements which are, specifically, either round or rectilinear, the individual structural component parts of the immersion nozzle are adapted to the anticipated high thermal stresses. In addition to the simple geometrical shape, wall elements of identical thickness are used.
Since the transition between the pour-in part and the pour-out part is of secondary importance to the flow ratios, constructional freedom can be exploited for purposes of optimization with respect to freeing the transition part from stresses.
A positive influence can be exercised on the flow ratios especially in the transition region by baffle or deflector elements arranged at the base of the pour-in part.
The complete calming of the flow behavior in the melt which is achieved by the simple shape of the pour-out part enables the required throughput quantities to be produced in the casting of thin slabs while minimizing the free outlet area.
The requirement for small surface area makes it possible to use immersion nozzles for thin-slab molds with parallel side walls and a width of up to
REFERENCES:
patent: 5314099 (1994-05-01), Butz et al.
patent: 5429283 (1995-07-01), Luhrsen et al.
patent: 5547014 (1996-08-01), Bruckner et al.
patent: 5681498 (1997-10-01), Poloni et al.
patent: 5716538 (1998-02-01), Poloni et al.
Forster Herbert
Reichelt Wolfgang
Schemeit Jurgen
Urlau Ulrich
Kastler Scott
Mannesmann Aktiengesellschaft
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