EP0254909A1 - Refractory pouring nozzle - Google Patents

Refractory pouring nozzle Download PDF

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Publication number
EP0254909A1
EP0254909A1 EP87109646A EP87109646A EP0254909A1 EP 0254909 A1 EP0254909 A1 EP 0254909A1 EP 87109646 A EP87109646 A EP 87109646A EP 87109646 A EP87109646 A EP 87109646A EP 0254909 A1 EP0254909 A1 EP 0254909A1
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EP
European Patent Office
Prior art keywords
pouring tube
edge
tube according
tear
guide element
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Granted
Application number
EP87109646A
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German (de)
French (fr)
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EP0254909B1 (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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    • 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, a turbulence harmful to solidification occurs 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 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 uniformly above the entire cross section of the mold is distributed.
  • 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 width of the pipe.
  • the part of the guide element located 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 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 held with a conical head piece 2 ⁇ .
  • the pouring tube 2 projects with its lower end into a mold 3 for casting thin slabs of the order of magnitude of preferably 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 von 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 to a vertex 14 in an arc shape toward 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 from the top, most distant from the tube wall Part 15 ⁇ beveled 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.

Abstract

Ein feuerfestes Gießrohr (2) zum Stranggießen schmelzflüssiger Metalle, insbesondere schmelzflüssigen Stahls in einer Kokille für dünne Brammen, ist an seiner unteren Stirnseite durch eine Bodenplatte 13 abgedeckt und weist zwei gegenüberliegende Ausflußöffnungen 11 auf. Während der Rand des Bodens 13 eine Abreißkante 11' für das schmelzflüssige Metall bildet, schließt sich an den übrigen Rand der insbesondere torbogenartig ausgebildeten Ausflußöffnung 11 ein dachförmiges Leitelement 15 an, dessen Seitenteile 15' von der äußeren Kante des oberen Teiles 15" des Leitelementes 15 ausgehende schräg nach unten zur unteren Abreißkante 11' verlaufende freie Kanten 15" haben.A fireproof pouring tube (2) for the continuous casting of molten metals, in particular molten steel in a mold for thin slabs, is covered on its lower end face by a base plate 13 and has two opposite outlet openings 11. While the edge of the base 13 forms a tear-off edge 11 'for the molten metal, a roof-shaped guide element 15 adjoins the remaining edge of the outflow opening 11, which is designed in particular in the manner of an arch, the side parts 15' of which of the guide element 15 extend from the outer edge of the upper part 15 " outgoing oblique downward to the lower tear-off edge 11 'have free edges 15 ".

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 Turbolenz 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, a turbulence harmful to solidification occurs 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 22 50 048) 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 used in the outlet openings (DE-PS 22 50 048), 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 guiding element, it is prevented that molten metal splashes up to the upper regions of the cooled mold wall and fills up there. 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 uniformly above the entire cross section of the mold is distributed.

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 liche 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 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 oberehalb 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 located 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.In terms of flow technology, it is favorable if the floor in the Center is bulged towards the inside of the tube to form guide surfaces sloping towards the outflow openings.

Nach weiteren Ausgestaltungen ist die liche Weite der Ausflußöffnungen höchstens gleich dem Abstand der Breitseitenwandungen der Kokille in ihrem unteren, das Strangformat bestimmenden Bereich.According to further refinements, the 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 Strangießen 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 V - V of FIG. 3rd

Im Boden eines Verteilergefäßes 1 für flüssiges Metall ist ein Gießrohr 2 mit einem konischen Kopfstück 2ʹ 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.In the bottom of a distribution vessel 1 for liquid metal a pouring tube 2 held with a conical head piece 2ʹ. The pouring tube 2 projects with its lower end into a mold 3 for casting thin slabs of the order of magnitude of preferably 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 11ʹ 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 11ʹ 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 14ʹ bogenförmig zu den Abreißkanten 11ʹ 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 von 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 11ʹ 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 to a vertex 14 in an arc shape toward 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 15ʺ der Seitenteile 15ʹ dieses dachförmigen Leitelementes 15 sind vom oberen, am weitesten von der Rohrwand entfernten Teil 15ʺ zur Abreißkante 11ʹ im unteren Bereich der Ausflußöffnung 11 abgeschrägt. Der obere Teil 15ʺ des dachförmigen Leitelementes 15 ist schräg nach oben gerichtet und schließt mit der Achse des Gießrohres einen spitzen Winkel von mehr als 90° -α = 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 15ʺ of the side parts 15ʹ of this roof-shaped guide element 15 are from the top, most distant from the tube wall Part 15ʺ beveled to the tear-off edge 11ʹ in the lower region of the outflow opening 11. The upper part 15ʺ of the roof-shaped guide element 15 is directed obliquely upwards and includes an acute angle of more than 90 ° -α = 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 14ʹ 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 11ʹ 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 15ʺ 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 14ʹ 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. Through the tear-off edge 11ʹ formed by the base plate 13, the molten metal flowing out of the outlet openings 11 can flow directly downward. 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 15ʺ, guide the flow of the molten metal into the upper regions near the narrow side walls 5. Overall, an optimal distribution of the molten metal to the side areas during normal casting operation is achieved in this way, while splashes become molten at the start of casting Metal and caking on the cooled side walls is prevented. This means that the slab trays 12 can solidify evenly over the entire circumference. Finally, the special flow conduction of the molten metal enables the inclusion of inclusions in the molten bath towards the casting level 10.

Claims (13)

1. 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,
dadurch gekennzeichnet, daß die Ausflußöffnungen (11) im oberen Bereich ein von der Rohrwandung ausgehendes, dachförmiges Leitelement (15) und im unteren Bereich eine vom Boden (13) und/oder der Rohrwandung gebildete Abreißkante (11ʹ) aufweisen.1. Pouring tube for the continuous casting of molten metals, in particular liquid steel into thin slabs in a mold, preferably funnel-shaped in the middle in the upper area, with outflow openings opposite a closed bottom laterally in the tube wall and facing the narrow sides of the mold,
characterized in that the outflow openings (11) have a roof-shaped guide element (15) extending from the tube wall in the upper region and a tear-off edge (11ʹ) formed by the bottom (13) and / or the tube wall in the lower region. 2. Gießrohr nach Anspruch 1,
dadurch gekennzeichnet, daß jedes dachförmige Leitelement (15) an den Seiten jeder Ausflußöffnung bis zu deren Abreißkante (11ʹ) seitliche Teile (15ʹ) aufweist.2. pouring tube according to claim 1,
characterized in that each roof-shaped guide element (15) has lateral parts (15ʹ) on the sides of each outflow opening up to its tear-off edge (11ʹ). 3. Gießrohr nach Anspruch 2,
dadurch gekennzeichnet, daß der Abstand der freien Kanten (11ʺ) der seitlichen Teile (15ʹ) des Leitelementes (15) von der Rohrwandung vom oberen Bereich des Leitelementes (15) zur im unteren Bereich vorgesehenen Abreißkante (11ʹ) kleiner wird.3. pouring tube according to claim 2,
characterized in that the distance between the free edges (11ʺ) of the lateral parts (15ʹ) of the guide element (15) from the tube wall from the upper region of the guide element (15) to the tear-off edge (11ʹ) provided in the lower region becomes smaller. 4. Gießrohr nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß jede Abreißkante (11ʹ) in einer senkrecht zur Rohrachse verlaufenden Ebene liegt.4. pouring tube according to one of claims 1 to 3,
characterized in that each tear-off edge (11ʹ) lies in a plane running perpendicular to the tube axis. 5. Gießrohr nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß die Ausflußöffnungen (11) im oberen Bereich torbogenartig ausgebildet sind.5. pouring tube according to one of claims 1 to 4,
characterized in that the outflow openings (11) are formed like an arch in the upper region. 6. Gießrohr nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß das Leitelement (15) der Form der zugehörigen Ausflußöffnung (11) angepaßt ist.6. pouring tube according to one of claims 1 to 5,
characterized in that the guide element (15) is adapted to the shape of the associated outflow opening (11). 7. Gießrohr nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, daß die lichte Weite jeder Ausflußöffnung (11) sich vom oberen Bereich zur Abreißkante (11ʹ) hin vergößert.7. pouring tube according to one of claims 1 to 6,
characterized in that the clear width of each outflow opening (11) increases from the upper region to the tear-off edge (11ʹ). 8. Gießrohr nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, daß die Abreißkante (11ʹ) sich über die gesamte lichte Weite des Rohres erstreckt.8. pouring tube according to one of claims 1 to 7,
characterized in that the tear-off edge (11ʹ) extends over the entire inside width of the tube. 9. Gießrohr nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, daß das oberhalb der Ausflußöffnung (11) liegende Teil des Leitelementes (15) mit dem darüberliegenden Teil der Rohrwandung einen spitzen Winkel einschließt.9. pouring tube according to one of claims 1 to 8,
characterized in that the part of the guide element (15) lying above the outflow opening (11) forms an acute angle with the part of the tube wall lying above it. 10. Gießrohr nach Anspruch 9,
dadurch gekennzeichnet, daß der Winkel (90° -α) größer als 70° ist.10. pouring tube according to claim 9,
characterized in that the angle (90 ° -α) is greater than 70 °. 11. Gießrohr nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet, daß der Boden (13) in der Mitte unter Bildung von zu den Ausflußöffnungen (11) abfallenden Leitflächen (14ʹ) zum Rohrinneren hin aufgewölbt ist.11. Pouring tube according to one of claims 1 to 10,
characterized in that the base (13) is arched towards the inside of the tube, forming guide surfaces (14ʹ) sloping towards the outflow openings (11). 12. Gießrohr nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet, daß die lichte Weite (b) der Ausflußöffnung (11) höchstens gleich dem Abstand (d) der Breitseitenwände (4) der Kokille in ihrem unteren, das Strangformat bestimmenden Teil (7) ist.12. Pouring tube according to one of claims 1 to 11,
characterized in that the clear width (b) of the outflow opening (11) is at most equal to the distance (d) of the broad side walls (4) of the mold in its lower part (7) which determines the strand format. 13. Gießrohr nach einem der Ansprüche 1 bis 12,
dadurch gekennzeichnet, daß das Gießrohr 2 einen ovalen Querschnitt hat, an dessen Wandbereichen mit dem kleineren Krümmungsradius die Ausflußöffnungen (11) vorgesehen sind.13. Pouring tube according to one of claims 1 to 12,
characterized in that the pouring tube 2 has an oval cross section, on the wall areas of which the smaller radius of curvature provides the outflow openings (11).
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 true EP0254909A1 (en) 1988-02-03
EP0254909B1 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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Publication number Priority date Publication date Assignee Title
EP0352346A1 (en) 1987-06-05 1990-01-31 Toshiba Ceramics Co., Ltd. A submerged nozzle for steel casting
EP0403808A1 (en) * 1989-06-03 1990-12-27 Sms Schloemann-Siemag Aktiengesellschaft Submerged nozzle for pouring molten steel into a continuous casting mould
EP0482423A1 (en) * 1990-10-15 1992-04-29 Sms Schloemann-Siemag Aktiengesellschaft Immersion casting pipe for the introduction of molten steel in a continuous casting mould
WO1995029025A1 (en) * 1994-04-25 1995-11-02 Vesuvius Usa Submergent entry nozzle
EP0685282A1 (en) * 1994-05-30 1995-12-06 DANIELI & C. OFFICINE MECCANICHE S.p.A. Submerged nozzle for continuous casting
US5944261A (en) * 1994-04-25 1999-08-31 Vesuvius Crucible Company Casting nozzle with multi-stage flow division
US6027051A (en) * 1994-03-31 2000-02-22 Vesuvius Crucible Company Casting nozzle with diamond-back internal geometry and multi-part casting nozzle with varying effective discharge angles

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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
US5205343A (en) * 1989-06-03 1993-04-27 Sms Schloemann-Siemag Aktiengesellschaft Pouring tube for feeding molten steel into a continuous casting mold
US5879721A (en) * 1996-08-28 1999-03-09 Ebaa Iron, Inc. Movable pouring basin
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
WO2002034434A1 (en) * 2000-10-27 2002-05-02 The Ohio State University 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
SI1506827T1 (en) * 2003-08-01 2006-02-28 Hof Te Fiennes N V Casting system and method of casting non-ferrous metals
CN100398229C (en) * 2004-01-23 2008-07-02 住友金属工业株式会社 Immersion nozzle for continuous casting and continuous casting method using the immersion nozzle
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
CN214161385U (en) 2019-05-23 2021-09-10 维苏威集团有限公司 Pouring gate

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352346A1 (en) 1987-06-05 1990-01-31 Toshiba Ceramics Co., Ltd. A submerged nozzle for steel casting
EP0403808A1 (en) * 1989-06-03 1990-12-27 Sms Schloemann-Siemag Aktiengesellschaft Submerged nozzle for pouring molten steel into a continuous casting mould
TR24409A (en) * 1989-06-03 1991-11-01 Schloemann Siemag Ag SHOULD SUBMIT THE INTERMEDIATE OF MELT TO THE END OF A ENDLESS DOEKUEM FRAGRANCE
EP0482423A1 (en) * 1990-10-15 1992-04-29 Sms Schloemann-Siemag Aktiengesellschaft Immersion casting pipe for the introduction of molten steel in a continuous casting mould
US5785880A (en) * 1994-03-31 1998-07-28 Vesuvius Usa Submerged entry nozzle
US6027051A (en) * 1994-03-31 2000-02-22 Vesuvius Crucible Company Casting nozzle with diamond-back internal geometry and multi-part casting nozzle with varying effective discharge angles
WO1995029025A1 (en) * 1994-04-25 1995-11-02 Vesuvius Usa Submergent entry nozzle
US5944261A (en) * 1994-04-25 1999-08-31 Vesuvius Crucible Company Casting nozzle with multi-stage flow division
US6464154B1 (en) 1994-04-25 2002-10-15 Versuvius Crucible Company Casting nozzle with diamond-back internal geometry and multi-part casting nozzle with varying effective discharge angles and method for flowing liquid metal through same
EP0685282A1 (en) * 1994-05-30 1995-12-06 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Submerged nozzle for continuous casting
CN1042504C (en) * 1994-05-30 1999-03-17 丹尼利机械厂联合股票公司 Discharge nozzle for continuous casting

Also Published As

Publication number Publication date
ZA875017B (en) 1988-01-13
GR3000021T3 (en) 1989-10-31
CN87104752A (en) 1988-03-02
DE3760064D1 (en) 1989-04-20
DE3623660A1 (en) 1988-01-14
JPS6372454A (en) 1988-04-02
KR880001352A (en) 1988-04-22
US4819840A (en) 1989-04-11
EP0254909B1 (en) 1989-03-15
ES2007301B3 (en) 1990-08-16
BR8703549A (en) 1988-03-22

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