EP0254909B1 - Refractory pouring nozzle - Google Patents

Refractory pouring nozzle Download PDF

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Publication number
EP0254909B1
EP0254909B1 EP87109646A EP87109646A EP0254909B1 EP 0254909 B1 EP0254909 B1 EP 0254909B1 EP 87109646 A EP87109646 A EP 87109646A EP 87109646 A EP87109646 A EP 87109646A EP 0254909 B1 EP0254909 B1 EP 0254909B1
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EP
European Patent Office
Prior art keywords
pouring spout
pouring
guide element
spout according
outflow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP87109646A
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German (de)
French (fr)
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EP0254909A1 (en
Inventor
Hermann Dipl.-Ing. Lax
Karl-Ulrich Dipl.-Ing. Köhler
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Thyssen Stahl AG
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Thyssen Stahl AG
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Application filed by Thyssen Stahl AG filed Critical Thyssen Stahl AG
Priority to AT87109646T priority Critical patent/ATE41339T1/en
Priority to IN523/CAL/87A priority patent/IN165890B/en
Publication of EP0254909A1 publication Critical patent/EP0254909A1/en
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Publication of EP0254909B1 publication Critical patent/EP0254909B1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the invention relates to a fireproof pouring tube for the continuous casting of molten metals, in particular liquid steel into thin slabs in a mold which is preferably funnel-shaped in the middle in the upper region and has outflow openings opposite one another in front of a closed bottom in the tube wall and facing the narrow sides of the mold.
  • Such a known pouring tube (Stahleisen-Schriften, Issue 8, "The Continuous Casting of Steel", page 21) is more advantageous compared to a pouring tube that is open at the bottom because, as a result of the division and deflection of the pouring jet, turbulence harmful to the solidification develops the mold can be avoided. It is disadvantageous, however, that when the mold is filled, metal splashes up and cakes to the upper regions of the mold wall, as a result of which the formation of strand shells is prevented and breakthroughs can be caused. In addition, the distribution of the molten metal is not optimal. Too little molten metal gets into the upper areas, so that there is a temperature gradient towards these areas. This creates an uneven solidification front across the cross section of the strand to be cast.
  • molten metal can also be brought into areas of the mold that are further away from the pouring tube, but then there is an area in the immediate vicinity of the pouring tube in which molten metal is not directly from the pouring tube can reach.
  • the invention has for its object to provide a pouring tube of the type mentioned, in which there is no splashing and caking of metal splashes on the cooled mold wall at the start of pouring and in normal casting operation the molten metal over the cross section of the mold better than in known pouring tubes is distributed.
  • outflow openings each have a roof-shaped guide element starting from the tube wall and a tear-off edge formed by the bottom and / or the tube wall in the lower region.
  • the guide element Because of the guide element, it is prevented that molten metal splashes up to the upper areas of the cooled mold wall and fills there when it is filled. When the mold is filled, the guide element ensures that molten metal also reaches the upper areas on the narrow sides of the mold wall and that no zone of lower temperature is formed here. Because of the tear-off edge in the lower area, molten metal also gets directly into the area below the pouring tube, so that the result is that the molten metal is evenly distributed over the entire cross section of the mold.
  • each roof-shaped guide element on both sides of each outflow opening extends to the lower tear-off edge.
  • an embodiment is particularly advantageous in which the distance of the free edge of the lateral parts of the guide element from the tube wall from the upper region of the guide element to the tear-off edge provided in the lower region of the outflow opening becomes, in particular, continuously smaller.
  • each tear-off edge lies in a plane running perpendicular to the pipe axis.
  • the outflow openings should be arched in the upper area.
  • the guide element itself is preferably adapted to the shape of the associated outflow opening.
  • the uniform distribution of the molten metal can be further improved in that the clear width of each outflow opening increases from the upper region to the tear-off edge.
  • the tear-off edge should extend over the entire inside width of the pipe.
  • the part of the guide element lying above the outflow opening forms an acute angle with the part of the tube wall lying above it.
  • An angle that is greater than 70 ° has proven to be expedient.
  • the clear width of the outflow openings is at most equal to the distance between the broad side walls of the mold in its lower region, which determines the strand format.
  • the pouring tube in order to be able to introduce enough molten metal into the mold in the case of molds for wide thin slabs, the pouring tube, as is known per se, can have an oval cross section.
  • the outflow openings are provided on the wall areas with the smaller radius of curvature.
  • a pouring tube 2 with a conical head piece 2 ' is held in the bottom of a distribution vessel 1 for liquid metal.
  • the pouring tube 2 projects with its lower end into a mold 3 for casting thin slabs of the order of magnitude of preference wise 20-100 mm.
  • the mold 3 is formed by two opposite broad side walls 4 and two opposite narrow side walls 5.
  • the wide side walls 4 and the narrow side walls 5 are provided with cooling channels 6.
  • the broad side walls 4 form in the middle above a format-determining parallel section 7 an upwardly funnel-shaped pouring area 8 for receiving the lower end of the pouring tube 2.
  • the pouring tube 2 has an oval flow cross section and is closed at its lower end by a base plate 13. Immediately above the base plate 13 on the narrow sides of the tube wall, arched outlet openings 1 are provided on opposite sides.
  • the lower edge 11 'of the outflow opening 11, formed by the base plate 13, lies in a plane perpendicular to the axis of the pouring tube 2 and acts as a tear-off edge.
  • the maximum width b of the outflow opening 11 at the tear-off edge 11 ' is equal to or smaller than the clear distance d between the wide side walls 4 of the mold 3 in the format-determining parallel section 7.
  • the inside of the base plate 13 is arched into a vertex 14 in an arc shape towards the inside of the pouring tube 2. From the apex 14 of this bulge, guide surfaces 14 'fall in an arc towards the tear-off edges 11'.
  • a roof-shaped guide element 15 connects to the lateral edges and the upper edge of the outlet opening 11 shaped like an archway.
  • the free edges 15 "of the side parts 15 'of this roof-shaped guide element 15 are chamfered from the upper, most distant part 15" to the tear-off edge 11' in the lower region of the outflow opening 11.
  • the molten metal flowing into the pouring tube 2 is divided by the apex 14 and the guide surface 14 'of the bulge of the base plate 13 and exits through the outflow openings 11. Since the mold is not yet filled with the flow-damping molten metal in this phase, the guide element 15 prevents metal from splashing upwards and to the sides and caking on the cooled broad side walls 4 and narrow side walls 5.
  • the molten metal flowing out into the mold 3 solidifies on the wall of the mold 3 and connects to a start-up head 9 which closes the mold 3 from below. As soon as the rising mold level 10 exceeds the lateral openings 11, it is covered with mold powder.
  • each guide element 15 prevent molten metal from flowing directly against the nearby broad side walls 4 and, together with the upper, far preferred part 15 ", guide the flow of the molten metal into the upper regions near the narrow side walls 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Description

Die Erfindung betrifft ein feuerfestes Gießrohr zum Stranggießen schmelzflüssiger Metalle, insbesondere flüssigen Stahls zu dünnen Brammen in einer vorzugsweise in der Mitte im oberen Bereich trichterförmigen Kokille mit vor einem geschlossenen Boden seitlich in der Rohrwandung sich gegenüberliegenden und den Schmalseiten der Kokille zugewandten Ausflußöffnungen.The invention relates to a fireproof pouring tube for the continuous casting of molten metals, in particular liquid steel into thin slabs in a mold which is preferably funnel-shaped in the middle in the upper region and has outflow openings opposite one another in front of a closed bottom in the tube wall and facing the narrow sides of the mold.

Ein solches bekanntes Gießrohr (Stahleisen-Schriften, Heft 8, "Das Stranggießen von Stahl", Seite 21) ist im Vergleich zu einem nach unten offenen Gießrohr vorteilhafter, weil sich in Folge der Aufteilung und Ablenkung des Gießstrahls eine für die Erstarrung schädliche Turbulenz in der Kokille vermeiden läßt. Nachteilig ist jedoch, daß beim Füllen der Kokille Metall zu den oberen Bereichen der Kokillenwandung hochspritzt und anbackt, wodurch die Strangschalenbildung behindert und Durchbrüche verursacht werden können. Darüber hinaus ist die Verteilung der Metallschmelze nicht optimal. Vor allem in die oberen Bereiche gelangt zu wenig schmelzflüssiges Metall, so daß sich zu diesen Bereichen hin ein Temperaturgefälle ergibt. Dadurch entsteht eine ungleichmäßige Erstarrungsfront über den Querschnitt des zu gießenden Stranges.Such a known pouring tube (Stahleisen-Schriften, Issue 8, "The Continuous Casting of Steel", page 21) is more advantageous compared to a pouring tube that is open at the bottom because, as a result of the division and deflection of the pouring jet, turbulence harmful to the solidification develops the mold can be avoided. It is disadvantageous, however, that when the mold is filled, metal splashes up and cakes to the upper regions of the mold wall, as a result of which the formation of strand shells is prevented and breakthroughs can be caused. In addition, the distribution of the molten metal is not optimal. Too little molten metal gets into the upper areas, so that there is a temperature gradient towards these areas. This creates an uneven solidification front across the cross section of the strand to be cast.

Mit in den Austrittsöffnungen eingesetzten Verteilrohren (DE-PS 2 250 048) läßt sich zwar schmelzflüssiges Metall auch in vom Gießrohr entferntere Bereiche der Kokille bringen, doch ergibt sich dann in unmittelbarer Nähe des Gießrohres ein Bereich, in den schmelzflüssiges Metall nicht unmittelbar aus dem Gießrohr gelangen kann.With distribution pipes inserted in the outlet openings (DE-PS 2 250 048), molten metal can also be brought into areas of the mold that are further away from the pouring tube, but then there is an area in the immediate vicinity of the pouring tube in which molten metal is not directly from the pouring tube can reach.

Der Erfindung liegt die Aufgabe zugrunde, ein Gießrohr der eingangs genannten Art zu schaffen, bei dem es bei Gießbeginn nicht zum Hochspritzen und Anbacken von Metallspritzern an der gekühlten Kokillenwandung kommt und beim normalen Gießbetrieb das schmelzflüssige Metall über den Querschnitt der Kokille besser als bei bekannten Gießrohren verteilt wird.The invention has for its object to provide a pouring tube of the type mentioned, in which there is no splashing and caking of metal splashes on the cooled mold wall at the start of pouring and in normal casting operation the molten metal over the cross section of the mold better than in known pouring tubes is distributed.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Ausflußöffnungen im oberen Bereich jeweils ein von der Rohrwandung ausgehendes, dachförmiges Leitelement und im unteren Bereich eine vom Boden und/oder der Rohrwandung gebildete Abreißkante aufweisen.This object is achieved in that the outflow openings each have a roof-shaped guide element starting from the tube wall and a tear-off edge formed by the bottom and / or the tube wall in the lower region.

Wegen des Leitelementes wird verhindert, daß beim Füllen schmelzflüssiges Metall zu den oberen Bereichen der gekühlten Kokillenwandung hochspritzt und dort anbackt. Bei gefüllter Kokille sorgt das Leitelement dafür, daß auch in die oberen Bereiche an den Schmalseiten der Kokillenwandung schmelzflüssiges Metall gelangt und hier keine Zone geringerer Temperatur entsteht. Wegen der Abreißkante im unteren Bereich gelangt schmelzflüssiges Metall aber auch direkt in den Bereich unterhalb des Gießrohres, so daß im Ergebnis das schmelzflüssige Metall gleichmäßig über den gesamten Querschnitt der Kokille verteilt wird.Because of the guide element, it is prevented that molten metal splashes up to the upper areas of the cooled mold wall and fills there when it is filled. When the mold is filled, the guide element ensures that molten metal also reaches the upper areas on the narrow sides of the mold wall and that no zone of lower temperature is formed here. Because of the tear-off edge in the lower area, molten metal also gets directly into the area below the pouring tube, so that the result is that the molten metal is evenly distributed over the entire cross section of the mold.

Die gleichmäßige Verteilung des schmelzflüssigen Metalls und damit auch eine gleichmäßige Temperaturverteilung über den Querschnitt der Kokille kann nach einer Ausgestaltung der Erfindung dadurch begünstigt werden, daß jedes dachförmige Leitelement an beiden Seiten jeder Ausflußöffnung sich bis zu der unteren Abreißkante erstreckt. Dabei ist insbesondere eine Ausgestaltung vorteilhaft, bei der der Abstand der freien Kante der seitlichen Teile des Leitelementes von der Rohrwandung vom oberen Bereich des Leitelementes zu der im unteren Bereich der Ausflußöffnung vorgesehenen Abreißkante insbesondere kontinuierlich kleiner wird.The uniform distribution of the molten metal and thus also a uniform temperature distribution over the cross section of the mold can be favored according to one embodiment of the invention in that each roof-shaped guide element on both sides of each outflow opening extends to the lower tear-off edge. In this case, an embodiment is particularly advantageous in which the distance of the free edge of the lateral parts of the guide element from the tube wall from the upper region of the guide element to the tear-off edge provided in the lower region of the outflow opening becomes, in particular, continuously smaller.

Bei einer zweckmäßigen Ausführung liegt jede Abreißkante in einer senkrecht zur Rohrachse verlaufenden Ebene. Die Ausflußöffnungen sollten im oberen Bereich torbogenartig ausgebildet sein. Das Leitelement selbst ist vorzugsweise der Form der zugehörigen Ausflußöffnung angepaßt.In an expedient embodiment, each tear-off edge lies in a plane running perpendicular to the pipe axis. The outflow openings should be arched in the upper area. The guide element itself is preferably adapted to the shape of the associated outflow opening.

Die gleichmäßige Verteilung des schmelzflüssigen Metalls kann weiter dadurch verbessert werden, daß die lichte Weite jeder Ausflußöffnung vom oberen Bereich zur Abreißkante hin sich vergrößert. Die Abreißkante sollte sich über die gesamte lichte Weite des Rohres erstrecken.The uniform distribution of the molten metal can be further improved in that the clear width of each outflow opening increases from the upper region to the tear-off edge. The tear-off edge should extend over the entire inside width of the pipe.

Um die oberen Bereiche an den Schmalseiten der Kokille besser mit schmelzflüssigem Metall erreichen zu können, ist nach einer Ausgestaltung der Erfindung vorgesehen, daß das oberhalb der Ausflußöffnung liegende Teil des Leitelementes mit dem darüberliegenden Teil der Rohrwandung einen spitzen Winkel einschließt. Als zweckmäßig hat sich ein Winkel erwiesen, der größer als 70° ist.In order to be able to better reach the upper areas on the narrow sides of the mold with molten metal, it is provided according to one embodiment of the invention that the part of the guide element lying above the outflow opening forms an acute angle with the part of the tube wall lying above it. An angle that is greater than 70 ° has proven to be expedient.

Strömungstechnisch günstig ist es, wenn der Boden in der Mitte zum Rohrinneren hin unter Bildung von zu den Ausflußöffnungen abfallenden Leitflächen aufgewölbt ist.From a fluidic point of view, it is favorable if the bottom is curved in the middle towards the inside of the pipe, forming guide surfaces sloping towards the outflow openings.

Nach weiteren Ausgestaltungen ist die lichte Weite der Ausflußöffnungen höchstens gleich dem Abstand der Breitseitenwandungen der Kokille in ihrem unteren, das Strangformat bestimmenden Bereich.According to further refinements, the clear width of the outflow openings is at most equal to the distance between the broad side walls of the mold in its lower region, which determines the strand format.

Um bei Kokillen für breite dünne Brammen genügend schmelzflüssiges Metall in die Kokille einbringen zu können, kann das Gießrohr, wie an sich bekannt, einen ovalen Querschnitt haben. In diesem Fall sind die Ausflußöffnungen an den Wandbereichen mit dem kleineren Krümmungsradius vorgesehen.In order to be able to introduce enough molten metal into the mold in the case of molds for wide thin slabs, the pouring tube, as is known per se, can have an oval cross section. In this case, the outflow openings are provided on the wall areas with the smaller radius of curvature.

Im folgenden wird die Erfindung anhand einer ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Im einzelnen zeigen:

  • Fig. 1 eine Kokille zum Stranggießen einer dünnen Bramme mit einem Gießrohr im Längsschnitt durch die Schmalseitenwände der Kokille,
  • Fig. 2 die Kokille gemäß Fig. 1 im Längsschnitt durch die Breitseitenwände der Kokille,
  • Fig. 3 das Gießrohr aus Fig. 1 im Axialschnitt,
  • Fig. 4 das Gießrohr gemäß Fig. 3 in Teilansicht in Richtung einer Ausflußöffnung,
  • Fig. 5 das Gießrohr gemäß Fig. 3 im Querschnitt nach Linie V-V der Fig. 3.
The invention is explained in more detail below with the aid of a drawing representing an exemplary embodiment. In detail show:
  • 1 is a mold for the continuous casting of a thin slab with a pouring tube in longitudinal section through the narrow side walls of the mold,
  • 2 shows the mold according to FIG. 1 in longitudinal section through the broad side walls of the mold,
  • 3 shows the pouring tube from FIG. 1 in axial section,
  • 4 is a partial view of the pouring tube according to FIG. 3 in the direction of an outflow opening,
  • 3 in cross section along line VV of FIG .. 3

Im Boden eines Verteilergefäßes 1 für flüssiges Metall ist ein Gießrohr 2 mit einem konischen Kopfstück 2' gehalten. Das Gießrohr 2 ragt mit seinem unteren Ende in eine Kokille 3 zum Gießen von dünnen Brammen in der Größenordnung von vorzugsweise 20-100 mm. Die Kokille 3 wird von zwei gegenüberliegenden Breitseitenwänden 4 und zwei gegenüberliegenden Schmalseitenwänden 5 gebildet. Die Breitseitenwände 4 und die Schmalseitenwände 5 sind mit Kühlkanälen 6 versehen. Die Breitseitenwände 4 bilden in der Mitte oberhalb eines formatbestimmenden Parallelabschnittes 7 einen sich nach oben trichterförmig erweiternden Eingießbereich 8 zur Aufnahme des unteren Endes des Gießrohres 2.A pouring tube 2 with a conical head piece 2 'is held in the bottom of a distribution vessel 1 for liquid metal. The pouring tube 2 projects with its lower end into a mold 3 for casting thin slabs of the order of magnitude of preference wise 20-100 mm. The mold 3 is formed by two opposite broad side walls 4 and two opposite narrow side walls 5. The wide side walls 4 and the narrow side walls 5 are provided with cooling channels 6. The broad side walls 4 form in the middle above a format-determining parallel section 7 an upwardly funnel-shaped pouring area 8 for receiving the lower end of the pouring tube 2.

Das Gießrohr 2 hat einen ovalen Durchflußquerschnitt und ist an seiner unteren Stirnseite durch eine Bodenplatte 13 abgeschlossen. Unmittelbar über der Bodenplatte 13 an den Schmalseiten der Rohrwandung sind auf gegenüberliegenden Seiten torbogenartige Ausflußöffnungen 1 vorgesehen. Die untere, von der Bodenplatte 13 gebildete Kante 11' der Ausflußöffnung 11 liegt in einer Ebene senkrecht zur Achse des Gießrohres 2 und wirkt als Abreißkante. Die maximale Weite b der Ausflußöffnung 11 an der Abreißkante 11' ist gleich oder kleiner als der lichte Abstand d der Breitseitenwände 4 der Kokille 3 im formatbestimmenden Parallelabschnitt 7. Die Innenseite der Bodenplatte 13 ist zu einem Scheitel 14 bogenförmig zum Inneren des Gießrohres 2 aufgewölbt. Vom Scheitel 14 dieser Aufwölbung fallen Leitflächen 14' bogenförmig zu den Abreißkanten 11' ab.The pouring tube 2 has an oval flow cross section and is closed at its lower end by a base plate 13. Immediately above the base plate 13 on the narrow sides of the tube wall, arched outlet openings 1 are provided on opposite sides. The lower edge 11 'of the outflow opening 11, formed by the base plate 13, lies in a plane perpendicular to the axis of the pouring tube 2 and acts as a tear-off edge. The maximum width b of the outflow opening 11 at the tear-off edge 11 'is equal to or smaller than the clear distance d between the wide side walls 4 of the mold 3 in the format-determining parallel section 7. The inside of the base plate 13 is arched into a vertex 14 in an arc shape towards the inside of the pouring tube 2. From the apex 14 of this bulge, guide surfaces 14 'fall in an arc towards the tear-off edges 11'.

An den seitlichen Rändern und dem oberen Rand der torbogenartig geformten Ausflußöffnung 11 schließt sich ein dachförmiges Leitelement 15 an. Die freien Kanten 15" der Seitenteile 15' dieses dachförmigen Leitelementes 15 sind vom oberen, am weitesten von der Rohrwand entfernten Teil 15" zur Abreißkante 11' im unteren Bereich der Ausflußöffnung 11 abgeschrägt. Der obere Teil 15" des dachförmigen Leitelementes 15 ist schräg nach oben gerichtet und schließt mit der Achse des Gießrohres einen spitzen Winkel von mehr als 90°-a=70° ein.A roof-shaped guide element 15 connects to the lateral edges and the upper edge of the outlet opening 11 shaped like an archway. The free edges 15 "of the side parts 15 'of this roof-shaped guide element 15 are chamfered from the upper, most distant part 15" to the tear-off edge 11' in the lower region of the outflow opening 11. The upper part 15 "of the roof-shaped guide element 15 is directed obliquely upwards and includes an acute angle of more than 90 ° -a = 70 ° with the axis of the pouring tube.

Bei Gießbeginn wird das in das Gießrohr 2 einströmende schmelzflüssige Metall durch den Scheitel 14 und die Leitfläche 14' der Aufwölbung der Bodenplatte 13 geteilt und tritt durch die Ausflußöffnungen 11 aus. Da in dieser Phase die Kokille noch nicht mit die Strömung dämpfendem schmelzflüssigem Metall gefüllt ist, verhindert das Leitelement 15, daß Metall nach oben und zu den Seiten spritzt und an den gekühlten Breitseitenwänden 4 und Schmalseitenwänden 5 anbackt. Das in die Kokille 3 ausströmende schmelzflüssige Metall erstarrt an der Wand der Kokille 3 und verbindet sich mit einem die Kokille 3 von unten verschließenden Anfahrkopf 9. Sobald der ansteigende Gießspiegel 10 die seitlichen Öffnungen 11 übersteigt, wird er mit Gießpulver abgedeckt. An den gekühlten Breitseitenwänden 4 und Schmalseitenwänden 5 erstarrt der Stahl zu Brammenschalen 12, deren Dicke nach unten kontinuierlich zunimmt. Durch die von der Bodenplatte 13 gebildete Abreißkante 11' kann das aus den Austrittsöffnungen 11 ausströmende schmelzflüssige Metall direkt nach unten strömen. Die Seitenteile jedes Leitelementes 15 verhindern, daß schmelzflüssiges Metall direkt gegen die nahen Breitseitenwände 4 strömt und bewirken zusammen mit dem oberen weit vorgezogenen Teil 15" eine Führung der Strömung des schmelzflüssigen Metalls in die oberen nahe der Schmalseitenwänden 5 liegenden Bereiche. Insgesamt wird auf diese Art und Weise eine optimale Verteilung des schmelzflüssigen Metalls zu den Seitenbereichen während des normalen Gießbetriebes erreicht, während zu Gießbeginn Verspritzungen schmelzflüssigen Metalls und Anbacken an den gekühlten Seitenwandungen verhindert wird. Das bedeutet, daß die Brammenschalen 12 über den gesamten Umfang gleichmäßig erstarren können. Schließlich wird durch die besondere Strömungsleitung des schmelzflüssigen Metalls nach oben eine Ausscheidung von Einschlüssen im Schmelzbad zum Gießspiegel 10 hin ermöglicht.At the start of pouring, the molten metal flowing into the pouring tube 2 is divided by the apex 14 and the guide surface 14 'of the bulge of the base plate 13 and exits through the outflow openings 11. Since the mold is not yet filled with the flow-damping molten metal in this phase, the guide element 15 prevents metal from splashing upwards and to the sides and caking on the cooled broad side walls 4 and narrow side walls 5. The molten metal flowing out into the mold 3 solidifies on the wall of the mold 3 and connects to a start-up head 9 which closes the mold 3 from below. As soon as the rising mold level 10 exceeds the lateral openings 11, it is covered with mold powder. On the cooled broad side walls 4 and narrow side walls 5, the steel solidifies into slab trays 12, the thickness of which continuously increases downwards. The melted metal flowing out of the outlet openings 11 can flow directly downwards through the tear-off edge 11 ′ formed by the base plate 13. The side parts of each guide element 15 prevent molten metal from flowing directly against the nearby broad side walls 4 and, together with the upper, far preferred part 15 ", guide the flow of the molten metal into the upper regions near the narrow side walls 5. Overall, in this way and an optimal distribution of the molten metal to the side areas is achieved during normal casting operation, while at the start of the pouring process molten metal splashes and caking on the cooled side walls are prevented. This means that the slab trays 12 can solidify evenly over the entire circumference the special flow conduction of the molten metal upwards allows inclusions in the molten pool to be separated out towards the casting level 10.

Claims (13)

1. Pouring spout for the continuous casting of molten metals, especially liquid steel, into thin slabs in a mould which is funnel-shaped preferably in the centre in the upper region, with outflow orifices which are located opposite one another laterally in the spout wall in front of a closed bottom and which face the narrow sides of the mould, characterized in that the outflow orifices (11) have, in the upper region, a roof-shaped guide element (15) projecting from the spout wall and, in the lower region, a breakaway edge (11') formed by the bottom (13) and/or the spout wall.
2. Pouring spout according to Claim 1, characterized in that each roof-shaped guide element (15) has, at the sides of each outflow orifice, lateral parts (15') extending to the breakaway edge (11') of the latter.
3. Pouring spout according to Claim 2, characterized in that the distance of the free edges (11") of the lateral parts (15') of the guide element (15) from the spout wall decreases from the upper region of the guide element (15) to the breakaway edge (11') located in the lower region.
4. Pouring spout according to one of Claims 1 to 3, characterized in that each breakaway edge (11') is in a plane extending perpendicularly to the spout axis.
5. Pouring spout according to one of Claims 1 to 4, characterized in that the outflow orifices (11) are made archway-like in the upper region.
6. Pouring spout according to one of Claims 1 to 5, characterized in that the guide element (15) is matched to the shape of the associated outflow orifice (11).
7. Pouring spout according to one of Claims 1 to 6, characterized in that the clear width of each outflow orifice (11) increases from the upper region towards the breakaway edge (11').
8. Pouring spout according to one of Claims 1 to 7, characterized in that the breakaway edge (11') extends over the entire clear width of the spout.
9. Pouring spout according to one of Claims 1 to 8, characterized in that the part of the guide element (15) located above the outflow orifice (11) forms an acute angle with the part of the spout wall located above it.
10. Pouring spout according to Claim 9, characterized in that the angle (90°-a) is greater than 70°.
11. Pouring spout according to one of Claims 1 to 10, characterized in that the bottom (13) is curved upwards towards the spout interior in the centre, to form guide surfaces (14') descending to the outflow orifices (11).
12. Pouring spout according to one of Claims 1 to 11, characterized in that the clear width (b) of the outflow orifice (11) is at most equal to the distance (d) between the wide sidewalls (4) of the mould in its lower part (7) determining the casting format.
13. Pouring spout according to one of Claims 1 to 12, characterized in that the pouring spourt (2) has an oval cross-section, the outflow orifices (11) being located in its wall regions having the smaller radius of curvature.
EP87109646A 1986-07-12 1987-07-04 Refractory pouring nozzle Expired EP0254909B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT87109646T ATE41339T1 (en) 1986-07-12 1987-07-04 FIRE RESISTANT POURING PIPE.
IN523/CAL/87A IN165890B (en) 1986-07-12 1987-07-08

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863623660 DE3623660A1 (en) 1986-07-12 1986-07-12 FIREPROOF PIPE
DE3623660 1986-07-12

Publications (2)

Publication Number Publication Date
EP0254909A1 EP0254909A1 (en) 1988-02-03
EP0254909B1 true EP0254909B1 (en) 1989-03-15

Family

ID=6305111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109646A Expired EP0254909B1 (en) 1986-07-12 1987-07-04 Refractory pouring nozzle

Country Status (10)

Country Link
US (1) US4819840A (en)
EP (1) EP0254909B1 (en)
JP (1) JPS6372454A (en)
KR (1) KR880001352A (en)
CN (1) CN87104752A (en)
BR (1) BR8703549A (en)
DE (2) DE3623660A1 (en)
ES (1) ES2007301B3 (en)
GR (1) GR3000021T3 (en)
ZA (1) ZA875017B (en)

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DE3811751A1 (en) * 1988-04-08 1989-10-19 Schloemann Siemag Ag SUBMERSIBLE PIPE FOR INLETING METAL MELT INTO A METAL BAND MOLDING CHOCOLATE
DE3918228C2 (en) * 1989-06-03 1996-11-07 Schloemann Siemag Ag Immersion pouring tube for introducing molten steel into a continuous casting mold
US5205343A (en) * 1989-06-03 1993-04-27 Sms Schloemann-Siemag Aktiengesellschaft Pouring tube for feeding molten steel into a continuous casting mold
DE4032624A1 (en) * 1990-10-15 1992-04-16 Schloemann Siemag Ag SUBMERSIBLE PIPE FOR INLETING STEEL MELT IN A CONTINUOUS MOLD
US5944261A (en) * 1994-04-25 1999-08-31 Vesuvius Crucible Company Casting nozzle with multi-stage flow division
US5785880A (en) * 1994-03-31 1998-07-28 Vesuvius Usa Submerged entry nozzle
IT1267242B1 (en) * 1994-05-30 1997-01-28 Danieli Off Mecc UNLOADER FOR THIN SLABS
US5879721A (en) * 1996-08-28 1999-03-09 Ebaa Iron, Inc. Movable pouring basin
UA51734C2 (en) * 1996-10-03 2002-12-16 Візувіус Крусібл Компані Immersed cup for liquid metal passing and method for letting liquid metal to path through it
DE19802809A1 (en) * 1998-01-27 1999-07-29 Km Europa Metal Ag Liquid-cooled mold
KR100488988B1 (en) * 2000-06-21 2005-05-11 주식회사 포스코 Submerged entry nozzle
US6543656B1 (en) 2000-10-27 2003-04-08 The Ohio State University Method and apparatus for controlling standing surface wave and turbulence in continuous casting vessel
SK5142003A3 (en) * 2000-10-27 2003-09-11 Univ Ohio State Method and apparatus for controlling standing surface wave and turbulence in continuous casting vessel
US7090918B2 (en) * 2001-01-11 2006-08-15 Vesuvius Crucible Company Externally glazed article
US6932250B2 (en) * 2003-02-14 2005-08-23 Isg Technologies Inc. Submerged entry nozzle and method for maintaining a quiet casting mold
ES2250796T3 (en) * 2003-08-01 2006-04-16 Hof Te Fiennes N.V. SYSTEM AND PROCEDURE OF COLADA OF NON-FERRIC METALS.
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US8225845B2 (en) * 2009-12-04 2012-07-24 Nucor Corporation Casting delivery nozzle
EP2444177A1 (en) * 2010-10-20 2012-04-25 Vesuvius Group S.A Pouring tube for liquid metal
JP5578112B2 (en) * 2011-03-02 2014-08-27 新日鐵住金株式会社 Induction heating device cooling method
CN104325126A (en) * 2014-10-13 2015-02-04 上海大学 Submersed nozzle for controlling metal fluid to flow in slab continuous casting process
CN111974981B (en) 2019-05-23 2023-08-29 维苏威集团有限公司 Casting nozzle

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Also Published As

Publication number Publication date
ES2007301B3 (en) 1990-08-16
DE3760064D1 (en) 1989-04-20
KR880001352A (en) 1988-04-22
JPS6372454A (en) 1988-04-02
CN87104752A (en) 1988-03-02
EP0254909A1 (en) 1988-02-03
DE3623660A1 (en) 1988-01-14
BR8703549A (en) 1988-03-22
US4819840A (en) 1989-04-11
ZA875017B (en) 1988-01-13
GR3000021T3 (en) 1989-10-31

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