EP0558018B1 - Refractory ceramic prefabricated element for mounting in a tundish - Google Patents

Refractory ceramic prefabricated element for mounting in a tundish Download PDF

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Publication number
EP0558018B1
EP0558018B1 EP93103026A EP93103026A EP0558018B1 EP 0558018 B1 EP0558018 B1 EP 0558018B1 EP 93103026 A EP93103026 A EP 93103026A EP 93103026 A EP93103026 A EP 93103026A EP 0558018 B1 EP0558018 B1 EP 0558018B1
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EP
European Patent Office
Prior art keywords
frame
part according
tundish
prefabricated part
porous plug
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Expired - Lifetime
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EP93103026A
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German (de)
French (fr)
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EP0558018A1 (en
Inventor
Franz Maier
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Veitsch Radex GmbH and Co OG
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Veitsch Radex GmbH and Co OG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/118—Refining the metal by circulating the metal under, over or around weirs

Definitions

  • the invention relates to a refractory ceramic prefabricated component for vertical installation in a distributor, also called tundish.
  • Such distributors fulfill the function of an intermediate container in continuous casting plants for the treatment of metallurgical melts.
  • the molten metal is guided from a ladle via a spout into the distribution channel, the distribution channel usually having a pouring area, which is delimited from the other sections of the distributor by a so-called "dam" which is used to calm the supplied metal melt on its way along the Distribution channel is used for pouring.
  • the molten metal flows over the dam.
  • the dams are placed on the bottom of the distributor and are limited in height so that they end below the level of the molten metal. Their primary task is to redirect the flow of the molten metal.
  • Weirs are arranged in the upper section of the distributor, transverse to the flow direction of the melt, and end at a distance from the bottom of the distributor. Their primary task is to hold back slag floating on the molten metal.
  • the flushing elements mentioned are ceramic, gas-permeable components which are arranged in the bottom of the distributor (the distributor channel).
  • a gas for example an inert gas such as argon, is injected into the molten metal through the flushing elements via a gas supply.
  • the flushing elements have the task of separating non-metallic inclusions within the molten metal.
  • a refractory ceramic component is known from EP 0 312 549 B1, which consists of a frame-shaped, dense ceramic receiving part, in which a porous section made of an open-cell, ceramic molded body is arranged.
  • the known component also has a gas line running in the receiving part, which serves to supply an inert gas in the direction of the porous section.
  • the known component fulfills a filter function in that the molten metal is passed through the porous section, whereby on the one hand there is a calming of the molten metal due to a slowdown in the flow rate and at the same time undesirable impurities within the molten metal are discharged from the molten metal with the inert gas flow to the surface of the molten bath become.
  • Another filter element is known from US-A-4,277,281, which is used for installation in a distribution channel, the filter element having a recess on the bottom into which a gas supply line, which is arranged in the bottom of the distributor, projects, via which a treatment gas is guided into the filter element .
  • the filter elements described above also fulfill a kind of "dam function", but only to the extent that they contribute to calming the flow of the molten metal.
  • FR-A-2 642 679 describes a device for eliminating non-metallic inclusions from a steel bath of a distributor. It consists of several components such as a flushing element and baffles. The distance between the baffles should be smaller than the width of the flushing element.
  • the invention is based on the object of demonstrating a possibility with which the treatment of a molten metal in a secondary metallurgical vessel, such as a tundish (a distribution channel), can be simplified in terms of apparatus without foregoing the advantages achieved with the known weirs, dams and dishwashers have to.
  • a secondary metallurgical vessel such as a tundish (a distribution channel)
  • the invention is based on the knowledge that this goal can be achieved by a refractory ceramic prefabricated component in which the functions of a dam, a weir and a flushing device are combined.
  • the basic idea of the invention is to combine a weir, a dam and a flushing element in a single prefabricated component.
  • the invention in its most general embodiment proposes a refractory ceramic prefabricated component for vertical installation in a distributor with the features of claim 1.
  • the frame consists of an upper and a lower horizontal part and two vertical parts connecting them.
  • the upper, horizontal part takes over the function of the well-known weirs, while the lower, horizontal part has the function of a dam.
  • the main difference compared to the filter elements described at the outset is that the frame has a central opening through which the molten metal can flow, whereby it is flow-guided by the dam and weir functions described and slag floating on the surface is retained.
  • the mean residence time of the melt in the distributor can be increased.
  • a surface flow profile of the molten metal is possible.
  • a laminar flow zone behind the dam is achieved by the lower horizontal part of the frame, which takes over the dam function, while - viewed in the flow direction of the melt - a homogenization zone is formed in front of the component.
  • the prefabricated component according to the invention also takes on the function of the flushing elements known from the prior art and used as separate components in the floor.
  • the flushing element is namely integrated in the area of the central opening (through opening) of the component, so that overall a compact component is created which takes over three functions simultaneously.
  • the flushing element should rest on the lower, horizontal frame part. It is preferably firmly anchored there, for example glued or mortared.
  • the rinsing element can be designed with directional or non-directional porosity. In the case of directed porosity, it is formed with individual through-channels which - starting from the gas supply line - extend into the area of the free surfaces of the flushing element and thus enable gas supply from the gas supply line to the molten metal.
  • the through-channels can be formed by appropriate measures in the manufacture of the flushing element. For this purpose, it is advisable to integrate combustible elements into the flushing element during manufacture, which are later burned out. However, it is also possible, for example, to subsequently drill the through-channels and, if necessary, to stabilize them with inserted metal tubes.
  • the through channels can either run directly vertically, so that they run out in the horizontal upper end face of the flushing element; but it is also possible to arrange them inclined so that they end at least partially in the vertical, lateral surfaces of the flushing element.
  • the latter case also makes it possible to direct the gas supply in front of and behind the component, which additionally facilitates the removal of non-metallic inclusions.
  • the flushing element can also - viewed in the direction of flow - project beyond the frame.
  • an essential advantage of the prefabricated component is that a flow profile that is compatible with the surface can be set, that is to say that the molten metal is always directed in the direction of the upper bath level.
  • a flow profile is advantageous because it allows non-metallic inclusions to be removed particularly effectively and deposited on the surface. These non-metallic inclusions are then deposited, for example, using known masking compounds.
  • an advantageous embodiment of the invention provides for the lower, horizontal part of the frame and / or the flushing element to be designed with a corresponding lateral inclined surface, so that the flow of the molten metal is given an upward flow direction. In this way, dead zones behind the horizontal sections of the component can be minimized or prevented altogether. If an exclusively vertical flow direction of the treatment gases supplied is desired, this can be additionally supported by the fact that the vertically running surfaces of the flushing element be formed with a gas-tight coating. Ceramic sizes can be used for this purpose, for example.
  • the dimensions of the prefabricated component described are placed on the associated distributor.
  • the external dimensions of the component correspond to the internal dimensions of the distributor.
  • the component is mortared or glued in the distributor, for example.
  • the positioning of the component can be additionally secured by mounting or reinforcement elements.
  • the distributor is designed with corresponding groove-shaped depressions in the side walls, so that the component can be inserted into these grooves and locked at the same time.
  • a corresponding groove formation is of course also possible and advantageous in the bottom area of the distributor.
  • the component has a height that exceeds the overall height of the distributor.
  • the external connection for the gas supply line can be formed in that section of the component which projects beyond the distributor, so that structural changes to the distributor are not required.
  • the assembly and disassembly of the component or the connected flushing element is made considerably easier. This applies in particular to known, flushing elements arranged in the bottom of the distributor.
  • the component In order to facilitate the assembly of the component, it can be formed in the region of the upper, horizontally running frame part with corresponding assembly devices, for example brackets or the like. Such assembly devices can be cast directly in the manufacture of the frame.
  • the component which can have a considerable weight depending on the size (depending on the distributor), can be easily brought to the desired position in the distributor and positioned there, for example with an appropriate crane system.
  • the frame can consist of a high-alumina mass that is cast, pressed or preferably isostatically pressed.
  • the frame should be designed in such a way that it is largely sealed and can therefore perform the dam and weir functions described.
  • the receiving part of the filter according to EP 0 312 549 B1 is said to be leak-proof, it can for example consist of an isostatically pressed component; however, it cannot assume the function of a weir because the filter has no free passage area for the molten metal and there is no flow control or slag retention function.
  • the main advantage of the prefabricated component described is that it combines the functions of the dams, weirs and flushers used as three separate components in the prior art and at the same time enables the metallurgical advantages described. At the same time, there are manufacturing simplifications, simplifications in assembly and associated cost advantages.
  • the prefabricated component shown in Figure 1 consists of a frame 10 with an upper, horizontal part 10a, a lower, horizontally running part 10b and two vertical legs 10c, d.
  • the frame 10 consists of a dense, high-alumina mass.
  • the frame - in the lateral view - has approximately the shape of a trapezoid, corresponding to the inner cross section of a distributor in which the component is to be inserted.
  • the frame parts 10a to d enclose a central opening 12, which also has an approximately trapezoidal cross-sectional area.
  • the flushing block 14 On the lower, horizontal frame part 10b there is a gas-permeable flushing block 14 which is glued to the corresponding surface sections of the frame parts 10b, c, d.
  • the flushing block consists of a gas-permeable, high-alumina mass with so-called undirected porosity.
  • a gas line (not shown) runs in the flushing block 14, which has a large number of openings through which a treatment gas, for example argon, enters the porous flushing block and from there into the molten metal can be blown.
  • a treatment gas for example argon
  • the section (not shown) of the gas line in the flushing block 14 continues on the connection side in a gas line 16 which leads along the frame part 10c into the frame part 10a and from there to the outside, where it can later be connected to a gas source.
  • the figure finally shows two brackets 18, which are firmly anchored in the upper frame part 10a and represent an assembly aid when the prefabricated component is in the in the figure 2 schematically shown position is used in a distributor.
  • the lower frame part 10b fulfills three functions at the same time: while the upper frame part 10a acts as a weir, i.e. serves to hold back slag and to direct the flow, the lower frame part 10b fulfills a dam function, i.e. it supports the flow deflection of the molten metal, which is shown schematically in FIG. 2 by arrows is.
  • the prefabricated component acts as a flushing device by blowing inert gas into the molten metal via the gas supply line 16 and the flushing block 14.
  • the contact between the inert gas and the molten metal is particularly intense because the molten metal must flow through the central opening 12 and thus immediately above the flushing device.
  • the molten metal can be drawn off later in a laminar flow via a spout 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Continuous Casting (AREA)

Abstract

The invention relates to a refractory ceramic prefabricated element for vertical installation in a tundish, with a gastight frame matched to the vertical internal cross-section of the tundish and having a central opening 12, with a gas feed line 16 extending along one frame section 10c, 10a and emerging with its gas-outlet end into a bubbler element 14 which is gas-permeable at least in the direction of the central opening 12 and is arranged between the vertical parts 10c, 10d of the frame 10. <IMAGE>

Description

Die Erfindung betrifft ein feuerfestes keramisches Fertigbauteil zum vertikalen Einbau in einem Verteiler, auch Tundish genannt.The invention relates to a refractory ceramic prefabricated component for vertical installation in a distributor, also called tundish.

Derartige Verteiler erfüllen die Funktion eines Zwischenbehälters in Stranggießanlagen zur Behandlung metallurgischer Schmelzen.Such distributors fulfill the function of an intermediate container in continuous casting plants for the treatment of metallurgical melts.

Dabei wird die Metallschmelze aus einer Gießpfanne über einen Ausguß in die Verteilerrinne geführt, wobei die Verteilerrinne üblicherweise einen Eingießbereich aufweist, der gegenüber den weiteren Abschnitten des Verteilers durch einen sogenannten "Damm" abgegrenzt wird, der zur Beruhigung der zugeführten Metallschmelze auf ihrem Weg entlang der Verteilerrinne zu deren Ausgüssen dient.The molten metal is guided from a ladle via a spout into the distribution channel, the distribution channel usually having a pouring area, which is delimited from the other sections of the distributor by a so-called "dam" which is used to calm the supplied metal melt on its way along the Distribution channel is used for pouring.

Dabei überströmt die Metallschmelze den Damm.The molten metal flows over the dam.

Weiterhin ist es bekannt, entlang des weiteren Weges der Metallschmelze zu den verschiedenen Ausgüssen weitere Dämme, sogenannte "Wehre" und "Spülelemente" anzuordnen.Furthermore, it is known to arrange further dams, so-called "weirs" and "flushing elements", along the further path of the molten metal to the different spouts.

Die Dämme werden auf dem Boden des Verteilers angeordnet und sind in ihrer Höhe so begrenzt, daß sie unterhalb des Spiegels der Metallschmelze enden. Sie haben in erster Linie die Aufgabe einer Strömungsumlenkung der Metallschmelze.The dams are placed on the bottom of the distributor and are limited in height so that they end below the level of the molten metal. Their primary task is to redirect the flow of the molten metal.

Wehre werden im oberen Abschnitt des Verteilers, quer zur Strömungsrichtung der Schmelze angeordnet und enden mit Abstand zum Boden des Verteilers. Sie haben in erster Linie die Aufgabe, auf der Metallschmelze schwimmende Schlacke zurückzuhalten.Weirs are arranged in the upper section of the distributor, transverse to the flow direction of the melt, and end at a distance from the bottom of the distributor. Their primary task is to hold back slag floating on the molten metal.

Bei den genannten Spülelementen handelt es sich um keramische, gasdurchlässige Bauteile, die im Boden des Verteilers (der Verteilerrinne) angeordnet werden. Über eine Gaszuführung wird ein Gas, beispielsweise ein Inertgas wie Argon, durch die Spülelemente in die Metallschmelze eingedüst. Die Spülelemente haben die Aufgabe, nichtmetallische Einschlüsse innerhalb der Metallschmelze abzuscheiden.The flushing elements mentioned are ceramic, gas-permeable components which are arranged in the bottom of the distributor (the distributor channel). A gas, for example an inert gas such as argon, is injected into the molten metal through the flushing elements via a gas supply. The flushing elements have the task of separating non-metallic inclusions within the molten metal.

Aus der EP 0 312 549 B1 ist ein feuerfestes keramisches Bauteil bekannt, das aus einem rahmenförmig ausgebildeten, dichten keramischen Aufnahmeteil besteht, in dem ein poröser Abschnitt aus einem offenzelligen, keramischen Formkörper angeordnet ist. Das bekannte Bauteil weist ferner eine im Aufnahmeteil verlaufende Gasleitung auf, die zur Zuführung eines Inertgases in Richtung auf den porösen Abschnitt dient.A refractory ceramic component is known from EP 0 312 549 B1, which consists of a frame-shaped, dense ceramic receiving part, in which a porous section made of an open-cell, ceramic molded body is arranged. The known component also has a gas line running in the receiving part, which serves to supply an inert gas in the direction of the porous section.

Das bekannte Bauteil erfüllt eine Filterfunktion, indem die Metallschmelze durch den porösen Abschnitt hindurchgeführt wird, wobei es einerseits zu einer Beruhigung der Metallschmelze aufgrund einer Verlangsamung der Durchströmgeschwindigkeit kommt und gleichzeitig unerwünschte Verunreinigungen innerhalb der Metallschmelze mit dem Inertgasstrom aus der Metallschmelze an die Oberfläche des Schmelzbades abgeführt werden.The known component fulfills a filter function in that the molten metal is passed through the porous section, whereby on the one hand there is a calming of the molten metal due to a slowdown in the flow rate and at the same time undesirable impurities within the molten metal are discharged from the molten metal with the inert gas flow to the surface of the molten bath become.

Eine ähnliche Filtereinrichtung offenbart auch die EP 0 239 257 B1.A similar filter device is also disclosed in EP 0 239 257 B1.

Aus der US-A-4,277,281 ist ein weiteres Filterelement bekannt, das zum Einbau in eine Verteilerrinne dient, wobei das Filterelement bodenseitig eine Aussparung aufweist, in die eine, im Boden des Verteilers angeordnete Gaszuführleitung hineinragt, über die ein Behandlungsgas in das Filterelement geführt wird.Another filter element is known from US-A-4,277,281, which is used for installation in a distribution channel, the filter element having a recess on the bottom into which a gas supply line, which is arranged in the bottom of the distributor, projects, via which a treatment gas is guided into the filter element .

Zwar erfüllen die vorstehend beschriebenen Filterelemente nach der Lehre der EP 0 312 549 B1 auch eine Art "Dammfunktion", aber lediglich insoweit, als sie zu einer Beruhigung der Strömung der Metallschmelze beitragen.According to the teaching of EP 0 312 549 B1, the filter elements described above also fulfill a kind of "dam function", but only to the extent that they contribute to calming the flow of the molten metal.

Die FR-A-2 642 679 beschreibt eine Einrichtung zur Elimination nicht metallischer Einschlüsse aus einem Stahlbad eines Verteilers. Es besteht aus mehreren Bauteilen wie einem Spülelement und Schikanen. Dabei soll der Abstand zwischen den Schikanen kleiner sein als die Breite des Spülelements.FR-A-2 642 679 describes a device for eliminating non-metallic inclusions from a steel bath of a distributor. It consists of several components such as a flushing element and baffles. The distance between the baffles should be smaller than the width of the flushing element.

Wenngleich sich die genannten Filterelemente grundsätzlich bewährt haben, so haftet ihnen doch ein Nachteil dahingehend an, daß die porösen Filterabschnitte relativ leicht verstopfen können, was einen vorzeitigen Austausch erforderlich macht und damit zusätzlichen Arbeitsaufwand und Kosten erfordert.Although the filter elements mentioned have proven themselves in principle, they have a disadvantage in that the porous filter sections can clog relatively easily, which necessitates an early replacement and thus requires additional work and costs.

Darüber hinaus können die bekannten Filterelemente nicht die Funktion der genannten Wehre übernehmen.In addition, the known filter elements can not take over the function of the weirs mentioned.

Der Erfindung liegt insoweit die Aufgabe zugrunde, eine Möglichkeit aufzuzeigen, mit der die Behandlung einer Metallschmelze in einem sekundärmetallurgischen Gefäß, wie einem Tundish (einer Verteilerrinne) apparativ vereinfacht werden kann, ohne auf die mit den bekannten Wehren, Dämmen und Spülern erreichten Vorteile verzichten zu müssen.In this respect, the invention is based on the object of demonstrating a possibility with which the treatment of a molten metal in a secondary metallurgical vessel, such as a tundish (a distribution channel), can be simplified in terms of apparatus without foregoing the advantages achieved with the known weirs, dams and dishwashers have to.

Der Erfindung liegt die Erkenntnis zugrunde, daß dieses Ziel durch ein feuerfestes keramisches Fertigbauteil erreicht werden kann, in dem die Funktionen eines Damms, eines Wehrs und eines Spülers vereinigt sind.The invention is based on the knowledge that this goal can be achieved by a refractory ceramic prefabricated component in which the functions of a dam, a weir and a flushing device are combined.

Grundgedanke der Erfindung ist es insoweit, ein Wehr, einen Damm und ein Spülelement in einem einzigen Fertigbauteil zu vereinigen.In this respect, the basic idea of the invention is to combine a weir, a dam and a flushing element in a single prefabricated component.

Insoweit schlägt die Erfindung in ihrer allgemeinsten Ausführungsform ein feuerfestes keramisches Fertigbauteil zum vertikalen Einbau in einem Verteiler mit den Merkmalen des Anspruchs 1 vor.In this respect, the invention in its most general embodiment proposes a refractory ceramic prefabricated component for vertical installation in a distributor with the features of claim 1.

Betrachtet man zunächst den Rahmen für sich, so besteht dieser aus einem oberen und einem unteren horizontalen Teil und zwei, diese verbindenden vertikalen Teilen.If you first consider the frame as such, it consists of an upper and a lower horizontal part and two vertical parts connecting them.

Dabei übernimmt der obere, horizontale Teil die Funktion der bekannten Wehre, während der untere, horizontale Teil die Funktion eines Damms hat.The upper, horizontal part takes over the function of the well-known weirs, while the lower, horizontal part has the function of a dam.

Gegenüber den eingangs beschriebenen Filterelementen besteht der wesentliche Unterschied darin, daß der Rahmen eine Mittenöffnung hat, durch die die Metallschmelze hindurchströmen kann, wobei sie durch die beschriebenen Damm- und Wehrfunktionen strömungsmäßig gelenkt und auf der Oberfläche aufschwimmende Schlacke zurückgehalten wird.The main difference compared to the filter elements described at the outset is that the frame has a central opening through which the molten metal can flow, whereby it is flow-guided by the dam and weir functions described and slag floating on the surface is retained.

Auf diese Weise kann die mittlere Verweilzeit der Schmelze im Verteiler erhöht werden. Außerdem ist ein oberflächengängiges Strömungsprofil der Metallschmelze möglich.In this way, the mean residence time of the melt in the distributor can be increased. In addition, a surface flow profile of the molten metal is possible.

Durch den, die Dammfunktion übernehmenden unteren horizontalen Teil des Rahmens wird eine laminare Strömungszone hinter dem Damm erreicht, während - in Strömungsrichtung der Schmelze betrachet - vor dem Bauteil eine Homogenisierungszone ausgebildet wird.A laminar flow zone behind the dam is achieved by the lower horizontal part of the frame, which takes over the dam function, while - viewed in the flow direction of the melt - a homogenization zone is formed in front of the component.

Dadurch, daß Damm und Wehr in einem einzigen Bauteil miteinander kombiniert werden, lassen sich darüber hinaus Totzonen hinter dem Damm und dem Wehr (in Strömungsrichtung der Schmelze betrachtet) minimieren.Because the dam and weir are combined in a single component, dead zones behind the dam and weir (viewed in the direction of the melt flow) can also be minimized.

Gleichzeitig übernimmt das erfindungsgemäße Fertigbauteil aber auch die Funktion der aus dem Stand der Technik bekannten, als separate Bauteile im Boden eingesetzten Spülelemente. Das Spülelement wird nämlich im Bereich der Mittenöffnung (Durchgangsöffnung) des Bauteils integriert, so daß insgesamt ein kompaktes Bauteil entsteht, das drei Funktionen gleichzeitig übernimmt.At the same time, however, the prefabricated component according to the invention also takes on the function of the flushing elements known from the prior art and used as separate components in the floor. The flushing element is namely integrated in the area of the central opening (through opening) of the component, so that overall a compact component is created which takes over three functions simultaneously.

Das Spülelement soll auf dem unteren, horizontalen Rahmenteil aufliegen. Es wird dort vorzugsweise fest verankert, beispielsweise eingeklebt oder eingemörtelt. Das Spülelement kann mit gerichteter oder ungerichteter Porosität ausgebildet sein. Im Fall gerichteter Porosität ist es mit einzelnen Durchgangskanälen ausgebildet, die - ausgehend von der Gaszuführleitung - bis in den Bereich der freien Oberflächen des Spülelementes verlaufen und so eine Gaszuführung von der Gaszuführleitung in die Metallschmelze ermöglichen. Die Durchgangskanäle können durch entsprechende Maßnahmen bei der Herstellung des Spülelementes ausgebildet werden. Dazu bietet es sich an, verbrennbare Elemente bei der Herstellung in das Spülelement zu integrieren, die später ausgebrannt werden. Ebenso ist es aber beispielsweise auch möglich, die Durchgangskanäle nachträglich zu bohren und gegebenenfalls durch eingesetzte Metallröhrchen zu stabilisieren.The flushing element should rest on the lower, horizontal frame part. It is preferably firmly anchored there, for example glued or mortared. The rinsing element can be designed with directional or non-directional porosity. In the case of directed porosity, it is formed with individual through-channels which - starting from the gas supply line - extend into the area of the free surfaces of the flushing element and thus enable gas supply from the gas supply line to the molten metal. The through-channels can be formed by appropriate measures in the manufacture of the flushing element. For this purpose, it is advisable to integrate combustible elements into the flushing element during manufacture, which are later burned out. However, it is also possible, for example, to subsequently drill the through-channels and, if necessary, to stabilize them with inserted metal tubes.

Die Durchgangskanäle können entweder unmittelbar vertikal verlaufen, so daß sie in der horizontalen oberen Stirnfläche des Spülelementes auslaufen; es ist aber ebenso möglich, sie geneigt anzuordnen, so daß sie zumindest teilweise auch in den vertikalen, seitlichen Oberflächen des Spülelementes enden. Der letztgenannte Fall ermöglicht es, die Gaszuführung auch vor und hinter das Bauteil zu lenken, wodurch die Ableitung von nichtmetallischen Einschlüssen zusätzlich erleichtert wird. Zu diesem Zweck kann das Spülelement den Rahmen auch - in Strömungsrichtung betrachtet - überragen.The through channels can either run directly vertically, so that they run out in the horizontal upper end face of the flushing element; but it is also possible to arrange them inclined so that they end at least partially in the vertical, lateral surfaces of the flushing element. The latter case also makes it possible to direct the gas supply in front of and behind the component, which additionally facilitates the removal of non-metallic inclusions. For this purpose, the flushing element can also - viewed in the direction of flow - project beyond the frame.

Vorstehend wurde bereits darauf hingewiesen, daß ein wesentlicher Vorteil des Fertigbauteils darin besteht, daß ein oberflächengängiges Strömungsprofil eingestellt werden kann, das heißt, daß die Metallschmelze stets in Richtung des oberen Badspiegels gelenkt wird. Ein solches Strömungsprofil ist deshalb vorteilhaft, weil dadurch nichtmetallische Einschlüsse besonders effektiv abgeleitet und auf der Oberfläche abgeschieden werden können. Eine Abscheidung dieser nichtmetallischen Einschlüsse erfolgt dann beispielsweise über bekannte Abdeckmassen.It has already been pointed out above that an essential advantage of the prefabricated component is that a flow profile that is compatible with the surface can be set, that is to say that the molten metal is always directed in the direction of the upper bath level. Such a flow profile is advantageous because it allows non-metallic inclusions to be removed particularly effectively and deposited on the surface. These non-metallic inclusions are then deposited, for example, using known masking compounds.

In diesem Sinne sieht eine vorteilhafte Ausführungsform der Erfindung vor, den unteren, horizontalen Teil des Rahmens und/oder das Spülelement mit einer entsprechenden seitlichen Schrägfläche auszubilden, so daß der Strömung der Metallschmelze eine Strömungsrichtung nach oben vorgegeben wird. Hierdurch lassen sich gleichzeitig Totzonen hinter den horizontalen Abschnitten des Bauteils minimieren oder ganz verhindern. Sofern eine ausschließlich vertikale Strömungsrichtung der zugeführten Behandlungsgase gewünscht wird, kann diese zusätzlich dadurch unterstützt werden, daß die vertikal verlaufenden Oberflächen des Spülelementes mit einer gasdichten Beschichtung ausgebildet werden. Hierzu können beispielsweise keramische Schlichten verwendet werden.In this sense, an advantageous embodiment of the invention provides for the lower, horizontal part of the frame and / or the flushing element to be designed with a corresponding lateral inclined surface, so that the flow of the molten metal is given an upward flow direction. In this way, dead zones behind the horizontal sections of the component can be minimized or prevented altogether. If an exclusively vertical flow direction of the treatment gases supplied is desired, this can be additionally supported by the fact that the vertically running surfaces of the flushing element be formed with a gas-tight coating. Ceramic sizes can be used for this purpose, for example.

Die Abmessungen des beschriebenen Fertigbauteils werden auf den jeweils zugehörigen Verteiler abgestellt. Im einfachsten Fall entsprechen die Außenabmessungen des Bauteils den Innenabmessungen des Verteilers. In diesem Fall wird das Bauteil zum Beispiel im Verteiler eingemörtelt oder verklebt. Durch Halterungs- oder Armierungselemente kann die Positionierung des Bauteils zusätzlich gesichert werden.The dimensions of the prefabricated component described are placed on the associated distributor. In the simplest case, the external dimensions of the component correspond to the internal dimensions of the distributor. In this case, the component is mortared or glued in the distributor, for example. The positioning of the component can be additionally secured by mounting or reinforcement elements.

Ebenso ist es aber auch möglich, das Bauteil gegenüber dem inneren Querschnitt des Verteilers breiter auszubilden. In diesem Fall wird der Verteiler mit entsprechenden nutförmigen Vertiefungen in den seitlichen Wänden gestaltet, so daß das Bauteil in diesen Nuten eingesetzt und gleichzeitig arretiert werden kann. Eine entsprechende Nutausbildung ist selbstverständlich auch im Bodenbereich des Verteilers möglich und vorteilhaft.However, it is also possible to make the component wider than the inner cross section of the distributor. In this case, the distributor is designed with corresponding groove-shaped depressions in the side walls, so that the component can be inserted into these grooves and locked at the same time. A corresponding groove formation is of course also possible and advantageous in the bottom area of the distributor.

Nach einer weiteren Ausführungsform der Erfindung ist vorgesehen, daß das Bauteil eine Höhe aufweist, die die Bauhöhe des Verteilers übersteigt. Hierdurch kann der externe Anschluß für die Gaszuführleitung in dem, den Verteiler überragenden Abschnitt des Bauteils ausgebildet werden, so daß konstruktive Änderungen am Verteiler entfallen. Darüber hinaus wird die Montage und Demontage des Bauteils beziehungsweise des angeschlossenen Spülelementes wesentlich erleichtert. Dies gilt insbesondere gegenüber bekannten, im Boden des Verteilers angeordneten Spülelementen.According to a further embodiment of the invention, it is provided that the component has a height that exceeds the overall height of the distributor. As a result, the external connection for the gas supply line can be formed in that section of the component which projects beyond the distributor, so that structural changes to the distributor are not required. In addition, the assembly and disassembly of the component or the connected flushing element is made considerably easier. This applies in particular to known, flushing elements arranged in the bottom of the distributor.

Um die Montage des Bauteils zu erleichtern, kann dieses im Bereich des oberen, horizontal verlaufenden Rahmenteils mit entsprechenden Montageeinrichtungen,zum Beispiel Bügeln oder dergleichen, ausgebildet werden. Derartige Montageeinrichtungen können bei der Herstellung des Rahmens direkt mit eingegossen werden. Das Bauteil, das je nach Größe (abhängig vom Verteiler) ein erhebliches Gewicht aufweisen kann, läßt sich auf diese Weise leicht,beispielsweise mit einer entsprechenden Krananlage, an die gewünschte Stelle im Verteiler bringen und dort positionieren.In order to facilitate the assembly of the component, it can be formed in the region of the upper, horizontally running frame part with corresponding assembly devices, for example brackets or the like. Such assembly devices can be cast directly in the manufacture of the frame. The component, which can have a considerable weight depending on the size (depending on the distributor), can be easily brought to the desired position in the distributor and positioned there, for example with an appropriate crane system.

Es können unterschiedlichste feuerfeste Materialien für das Bauteil verwendet werden. So kann der Rahmen beispielsweise aus einer hochtonerdehaltigen Masse bestehen, die gegossen, gepreßt oder vorzugsweise isostatisch gepreßt wird. Auf jeden Fall soll der Rahmen so gestaltet werden, daß er weitestgehend dicht ist und damit die beschriebenen Damm- und Wehrfunktionen erfüllen kann.A wide variety of refractory materials can be used for the component. For example, the frame can consist of a high-alumina mass that is cast, pressed or preferably isostatically pressed. In any case, the frame should be designed in such a way that it is largely sealed and can therefore perform the dam and weir functions described.

Zwar soll auch der Aufnahmeteil des Filters nach der EP 0 312 549 B1 dicht sein, und er kann beispielsweise aus einem isostatisch gepreßten Bauteil bestehen; er kann aber dennoch nicht die Funktion eines Wehrs übernehmen, weil der Filter keinen freien Durchgangsbereich für die Metallschmelze aufweist und insoweit eine Strömungslenkung beziehungsweise eine Schlackenrückhaltefunktion nicht gegeben ist.Although the receiving part of the filter according to EP 0 312 549 B1 is said to be leak-proof, it can for example consist of an isostatically pressed component; however, it cannot assume the function of a weir because the filter has no free passage area for the molten metal and there is no flow control or slag retention function.

Als Werkstoff für das Spülelement können bekannte Werkstoffe verwendet werden.Known materials can be used as the material for the flushing element.

Der wesentliche Vorteil des beschriebenen Fertigbauteils besteht darin, daß er die Funktionen der im Stand der Technik als drei separate Bauteile eingesetzten Dämme, Wehre und Spüler in sich vereinigt und gleichzeitig die beschriebenen metallurgischen Vorteile ermöglicht. Gleichzeitig ergeben sich herstellungstechnische Vereinfachungen, Vereinfachungen bei der Montage und damit verbunden Kostenvorteile.The main advantage of the prefabricated component described is that it combines the functions of the dams, weirs and flushers used as three separate components in the prior art and at the same time enables the metallurgical advantages described. At the same time, there are manufacturing simplifications, simplifications in assembly and associated cost advantages.

Weitere Merkmale der Erfindung sind aus den Merkmalen der Unteransprüche sowie den sonstigen Anmeldungsunterlagen entnehmbar.Further features of the invention can be found in the features of the subclaims and the other application documents.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert.The invention is explained in more detail below using an exemplary embodiment.

Dabei zeigen

Figur 1:
eine perspektivische Ansicht eines erfindungsgemäßen Fertigbauteils
Figur 2:
einen Längsschnitt durch einen Verteiler mit dem Fertigbauteil nach Figur 1,
jeweils in stark schematisierter Darstellung.Show
Figure 1:
a perspective view of a prefabricated component according to the invention
Figure 2:
2 shows a longitudinal section through a distributor with the finished component according to FIG. 1,
each in a highly schematic representation.

Das in Figur 1 dargestellte Fertigbauteil besteht aus einem Rahmen 10 mit einem oberen, horizontalen Teil 10a, einem unteren, horizontal verlaufenden Teil 10b und zwei vertikalen Schenkeln 10c, d.The prefabricated component shown in Figure 1 consists of a frame 10 with an upper, horizontal part 10a, a lower, horizontally running part 10b and two vertical legs 10c, d.

Der Rahmen 10 besteht aus einer dichten, hochtonerdehaltigen Masse.The frame 10 consists of a dense, high-alumina mass.

Wie die Figur erkennen läßt, weist der Rahmen - in der seitlichen Ansicht - in etwa die Form eines Trapezes auf, entsprechend dem Innenquerschnitt eines Verteilers, in den das Bauteil eingesetzt werden soll. Die Rahmenteile 10a bis d umschließen eine Mittenöffnung 12, die ebenfalls eine etwa trapezförmige Querschnittsfläche aufweist.As can be seen from the figure, the frame - in the lateral view - has approximately the shape of a trapezoid, corresponding to the inner cross section of a distributor in which the component is to be inserted. The frame parts 10a to d enclose a central opening 12, which also has an approximately trapezoidal cross-sectional area.

Auf dem unteren, horizontalen Rahmenteil 10b liegt ein gasdurchlässiger Spülblock 14 auf, der mit den korrespondierenden Flächenabschnitten der Rahmenteile 10b, c, d verklebt ist. Der Spülblock besteht aus einer gasdurchlässigen, hochtonerdehaltigen Masse mit sogenannter ungerichteter Porosität.On the lower, horizontal frame part 10b there is a gas-permeable flushing block 14 which is glued to the corresponding surface sections of the frame parts 10b, c, d. The flushing block consists of a gas-permeable, high-alumina mass with so-called undirected porosity.

In Längsrichtung des Spülblocks (also etwa parallel zum Rahmenteil 10b), verläuft eine (nicht dargestellte) Gasleitung im Spülblock 14, die eine Vielzahl von Durchbrechungen aufweist, über die ein Behandlungsgas, zum Beispiel Argon, in den porösen Spülblock und von dort in die Metallschmelze eingeblasen werden kann.In the longitudinal direction of the flushing block (i.e. approximately parallel to the frame part 10b), a gas line (not shown) runs in the flushing block 14, which has a large number of openings through which a treatment gas, for example argon, enters the porous flushing block and from there into the molten metal can be blown.

Der (nicht dargestellte) Abschnitt der Gasleitung im Spülblock 14 setzt sich anschlußseitig in einer Gasleitung 16 fort, die entlang des Rahmenteils 10c in den Rahmenteil 10a und von dort nach außen führt, wo sie später an eine Gasquelle angeschlossen werden kann.The section (not shown) of the gas line in the flushing block 14 continues on the connection side in a gas line 16 which leads along the frame part 10c into the frame part 10a and from there to the outside, where it can later be connected to a gas source.

Die Figur zeigt schließlich noch zwei Bügel 18, die im oberen Rahmenteil 10a fest verankert sind und eine Montagehilfe darstellen, wenn das Fertigbauteil in die in Figur 2 schematisch dargestellte Position in einen Verteiler eingesetzt wird.The figure finally shows two brackets 18, which are firmly anchored in the upper frame part 10a and represent an assembly aid when the prefabricated component is in the in the figure 2 schematically shown position is used in a distributor.

Es erfüllt dort gleichzeitig drei Funktionen: während der obere Rahmenteil 10a als Wehr wirkt, also der Schlackenrückhaltung und der Strömungslenkung dient, erfüllt der untere Rahmenteil 10b eine Dammfunktion, das heißt, er unterstützt die Strömungsumlenkung der Metallschmelze, die in Figur 2 schematisch durch Pfeile dargestellt ist.It fulfills three functions at the same time: while the upper frame part 10a acts as a weir, i.e. serves to hold back slag and to direct the flow, the lower frame part 10b fulfills a dam function, i.e. it supports the flow deflection of the molten metal, which is shown schematically in FIG. 2 by arrows is.

Ergänzend wirkt das Fertigbauteil als Spüler, indem über die Gaszuführleitung 16 und den Spülblock 14 Inertgas in die Metallschmelze eingeblasen wird. Dabei ist der Kontakt Inertgas/Metallschmelze besonders intensiv, weil die Metallschmelze durch die Mittenöffnung 12 hindurch und damit unmittelbar oberhalb der Spüleinrichtung entlangströmen muß.In addition, the prefabricated component acts as a flushing device by blowing inert gas into the molten metal via the gas supply line 16 and the flushing block 14. The contact between the inert gas and the molten metal is particularly intense because the molten metal must flow through the central opening 12 and thus immediately above the flushing device.

In Figur 2 ist angedeutet, daß der untere Rahmenteil 10b und der Spülblock 14 stirnseitig etwas angeschrägt sind. Hierdurch wird die Strömungsumlenkung begünstigt und ein oberflächengängiges Strömungsprofil erreicht.In Figure 2 it is indicated that the lower frame part 10b and the flushing block 14 are slightly beveled on the end. This favors the flow deflection and achieves a flow profile that is compatible with the surface.

Gleichzeitig kann die Metallschmelze in laminarer Strömung über einen Ausguß 20 später abgezogen werden.At the same time, the molten metal can be drawn off later in a laminar flow via a spout 20.

Claims (11)

  1. A prefabricated refractory ceramic part for vertical installation in a tundish, having:
    1.1 a dense frame (10) adapted to the inner cross section of the tundish and having a central opening (12),
    1.2 a gas feeding pipe (16) extending along a frame portion (10c, 10a),
    1.3 the gas outlet end of which runs into a porous plug (14), gaspermeable at least in the direction of the central opening (12), which
    1.4 is located between the vertical parts (10c, 10d) of the frame (10),
    1.5 the porous plug (14) being supported on the lower horizontal part (10b) of the frame.
  2. A prefabricated part according to claim 1, wherein the porous plug (14) is formed with a nondirectional porosity.
  3. A prefabricated part according to claim 1 or 2, wherein the porous plug is formed with a plurality of substantially vertically running through conduits, an end of which is respectively connected to the gas feeding pipe, and the other end of which runs respectively into the free surface of the porous plug.
  4. A prefabricated part according to claim 3, wherein the through conduits turn out in all three free surfaces of the porous plug.
  5. A prefabricated part according to any of claims 1 to 4, wherein the vertically running surfaces of the porous plug are formed with a gastight coating.
  6. A prefabricated part according to any of claims 1 to 5, wherein the parts (10a to d) of the and/or the porous plug (14) is (are) bevelled in the flow direction of the molten bath.
  7. A prefabricated part according to any of claims 1 to 6 having an overall height exceeding the inner vertical height of the tundish.
  8. A prefabricated part according to any of claims 1 to 7 having a width exceeding the inner dimensions of the tundish.
  9. A prefabricated part according to claim 7 or 8, wherein the gas feeding pipe (16) runs into the tundish at a frame part (10a) rising above it.
  10. A prefabricated part according to any of claims 1 to 9 having mounting means (18) in the region of the upper free, horizontally running part (10a) of the frame.
  11. A prefabricated part according to any of claims 1 to 10 wherein the frame (10) consists of a isostaticly pressed material.
EP93103026A 1992-02-26 1993-02-26 Refractory ceramic prefabricated element for mounting in a tundish Expired - Lifetime EP0558018B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4205853A DE4205853C1 (en) 1992-02-26 1992-02-26 Refractory ceramic prefabricated component for installation in a distributor
DE4205853 1992-02-26

Publications (2)

Publication Number Publication Date
EP0558018A1 EP0558018A1 (en) 1993-09-01
EP0558018B1 true EP0558018B1 (en) 1995-09-27

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EP93103026A Expired - Lifetime EP0558018B1 (en) 1992-02-26 1993-02-26 Refractory ceramic prefabricated element for mounting in a tundish

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EP (1) EP0558018B1 (en)
AT (1) ATE128393T1 (en)
DE (1) DE4205853C1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5551672A (en) * 1995-01-13 1996-09-03 Bethlehem Steel Corporation Apparatus for controlling molten metal flow in a tundish to enhance inclusion float out from a molten metal bath
GB9903937D0 (en) * 1999-02-22 1999-04-14 Foseco Int Tundish impact pad
US11338357B2 (en) * 2019-08-19 2022-05-24 Harbisonwalker International, Inc. Diffusion article

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277281A (en) * 1979-08-16 1981-07-07 Southwire Company Continuous filter for molten copper
US4667939A (en) * 1986-03-26 1987-05-26 Foseco International Limited Purifying steel
DE3642201C1 (en) * 1986-12-10 1988-06-16 Radex Deutschland Ag Refractory ceramic component
FR2642679B3 (en) * 1988-12-22 1990-11-30 Unimetall Sa DEVICE FOR ELIMINATING NON-METALLIC INCLUSIONS IN A CONTINUOUS CASTING DISTRIBUTOR OF STEEL
US5018710A (en) * 1990-10-15 1991-05-28 Magneco/Metrel, Inc. Method and devices for removing alumina and other inclusions from steel contained in tundishes

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ATE128393T1 (en) 1995-10-15
EP0558018A1 (en) 1993-09-01
DE4205853C1 (en) 1993-10-14

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