EP3593923A1 - Method for continuous casting, in particular for a vertical casting installation for pouring steel - Google Patents

Method for continuous casting, in particular for a vertical casting installation for pouring steel Download PDF

Info

Publication number
EP3593923A1
EP3593923A1 EP18183322.9A EP18183322A EP3593923A1 EP 3593923 A1 EP3593923 A1 EP 3593923A1 EP 18183322 A EP18183322 A EP 18183322A EP 3593923 A1 EP3593923 A1 EP 3593923A1
Authority
EP
European Patent Office
Prior art keywords
mold
tubular element
strand
casting
immersed
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.)
Granted
Application number
EP18183322.9A
Other languages
German (de)
French (fr)
Other versions
EP3593923B1 (en
Inventor
Thomas Meier
Stephan Feldhaus
Flurin Heini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Concast AG
Original Assignee
SMS Concast AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Concast AG filed Critical SMS Concast AG
Priority to EP18183322.9A priority Critical patent/EP3593923B1/en
Priority to PCT/EP2019/063964 priority patent/WO2020011444A1/en
Priority to CN201980046246.3A priority patent/CN112512725A/en
Publication of EP3593923A1 publication Critical patent/EP3593923A1/en
Application granted granted Critical
Publication of EP3593923B1 publication Critical patent/EP3593923B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • B22D11/141—Plants for continuous casting for vertical casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices

Definitions

  • the invention relates to a process for continuous or semi-continuous continuous casting, in particular in a vertical casting installation for casting steel, in which the strand is lowered in a cooled mold at the end of the casting after the melt supply has stopped in a cooled mold.
  • Such vertical casting plants are known to be used for the production of relatively short strands with larger cross-sectional formats. It melts metal from a metallurgical vessel, as from a pan or an intermediate container, fed through a pouring tube into a water-cooled mold, for example made of copper material. The strand that forms is poured vertically downwards until a defined length is reached. The output of these relatively short strands is determined in each case by the volume reduction of the potted material, in particular steel, during the solidification. This reduction in volume leads to the formation of a funnel at the upper end of the solidified strand without suitable countermeasures. Various methods are proposed to reduce or even prevent this funnel and thereby increase the output of the continuously or semi-continuously cast strands.
  • a method in such a vertical casting system according to the document WO-A-2015/101 553 Known, in which liquid metal is supplied to a certain extent after the regular casting process has ended.
  • a heating device positioned around the upper end region of the strand can also be provided, which controls the liquid metal reservoir at the top inside the strand. At least the shrinkage of the molten metal that occurs during solidification can thus be compensated for and the shrinkage cavity that is formed in the upper strand area can be shortened.
  • the invention has for its object to largely overcome these disadvantages and to provide a method of the type mentioned, which is characterized by simple handling in the continuous or semi-continuous casting of relatively short large-sized strands and a higher yield rate of the usable strand by lower shrinkage cavities and consequently also enables cost savings.
  • the system according to the invention has the advantage that it is only necessary to immerse the tubular element in the mold and, if necessary, to add insulating casting or covering powder over the molten metal after the casting process has ended. This simple procedure enables better output rates due to the shorter top strand end to be cut away.
  • the invention provides that the outer dimensions of the tubular element are slightly smaller than the inner dimensions of the mold, the gap formed between them being dimensioned in this way is that the gap dimension is, for example, approximately the thickness of the strand shell formed in the mold in the normal casting process corresponds or is chosen smaller.
  • the melt in this gap solidifies at a solidification rate predetermined by the mold cooling.
  • a connection between the outer strand shell and the tube material can simultaneously serve as a holding element for the tube element, while in the interior of the tube element the solidification process of the molten metal is continued at a greatly reduced rate of solidification due to the insulating effect of the tube element.
  • the strand which is still liquid in the mold is advantageously lowered to such an extent that the melt displaced to the outside after the insertion of the tube element does not flow out over the mold, but rather rises to approximately the same level as when casting.
  • the outer contour of the tubular element is adapted to the inner contour of the mold in such a way that the gap formed between them is uniformly dimensioned over the entire circumference.
  • tubular element has a uniform wall thickness over the entire length.
  • an inwardly projecting ring shoulder can be assigned to its lower end.
  • tube element can also be advantageous for the tube element to be composed of different tube segments, for example to modularly construct tube elements for different casting formats from segment parts.
  • Fig. 1 schematically shows the mold area with a mold 1 of a vertical casting plant 10, which is used by continuous or semi-continuous continuous casting for the production, in particular, of short, large-format strands.
  • a strand 5 which runs vertically downward from the mold 1 is produced, which is supported from below and can have a length of, for example, a few meters to 20 meters.
  • Conventional cooling zones for solidifying the strand are arranged below the mold, but are not illustrated in any more detail.
  • Fig. 3a shows the mold 1 during the casting of molten steel through a pouring tube 13 from a metallurgical not shown Vessel, such as from a pan or from a distributor serving as an intermediate container.
  • the molten steel is continuously poured in a conventional manner at a given fill level 15 at the upper end of the mold by an adjustable closing element, such as a stopper or a sliding closure, and the strand 5 is correspondingly lowered from the mold at a withdrawal speed.
  • the vessel with the pouring tube 13 is removed and as in Fig. 3b is illustrated, the strand 5 and thus the fill level 15 'in the mold is lowered. However, before the fill level 15 'has reached the lower end of the mold 1, the strand is stopped.
  • a pipe element 2 for example with a weight 19, is inserted into the mold 1 by means of a manipulator (not shown in more detail).
  • a manipulator not shown in more detail.
  • fastening or coupling means in the form of, for example, retractable and extractable bolts 9 or the like are provided, which detachably engage in corresponding bores in the tubular element.
  • this tube element 2 is immersed with its lower end 2 ′ into the molten metal in the mold 1 in such a way that the fill level of the molten metal rises almost to the upper end of the mold 1 as in casting.
  • the pipe element 2 is weighted, if necessary, by means of the weight 19, and a liquid metal reservoir 12 is formed in this pipe element, which can be covered at the top with a heat-insulating material, preferably covering powder 11.
  • Fig. 2 is the tubular element 2 as a sleeve-shaped body made of refractory material, the dimensions of which are slightly narrower than the internal dimensions of the mold 1. It is formed over the entire circumference of the mold 1, a gap 7 which is dimensioned such that the tube element 2 is within a strand shell 5 'forming during casting in the mold, while in the interior of the tube element the solidification process of the molten steel due to the insulating Effect of the tubular element is continued with a greatly reduced solidification speed compared to the conditions outside the tubular element.
  • the outer contour of the tubular element 2 is adapted to the inner contour of the mold 1 so that the gap 7 between them is dimensioned with an approximately uniform thickness d over the entire circumference.
  • the melt displaced when the tube element is immersed in the gap after it has solidified forms an optimal retaining ring for the tube element, which also has a uniform wall thickness.
  • This formed gap 7 is advantageously dimensioned approximately between 1 and 10% of the inner dimensions of the mold 1, so that an optimal condition can be achieved by this retaining ring comprising the tubular element.
  • the mold and the tubular element are rectangular in cross section. Of course, they could also be designed differently, such as round, square, polygonal or other formats.
  • the tube element 2 is immersed in the mold 1 after the end of the melt supply, as from Fig. 3c can be seen that its lower end 2 'approximately the depth 14 of the shrinking funnel 12 that forms at the upper end of the strand after the strand 5 solidifies and the melt within the tubular element equivalent.
  • the melting volume inside the tubular element compensates for the volume shrinkage due to the solidification of the strand located below the tubular element, whereby it must be ensured that the not yet solidified melt from the inner tube volume into the can flow into the lower strand.
  • the tube element 2 is preferably dimensioned with its wall thickness in such a way that, in the immersed state, it has such an immersed volume at the defined depth that the fill level 15 of the molten metal, as during casting, results approximately up to the upper end of the mold.
  • this tube element 2 has a length such that it can protrude beyond the mold 1 at the opposite upper end in the defined immersed depth.
  • a weight 19 which prevents the lighter refractory material of the tubular element from floating in the melt and can also serve as a connecting means with the tubular element for coupling with the manipulator or a crane. This allows it to be brought into the mold and then immersed in it.
  • this heat-insulating material, preferably covering powder 11, can be filled onto the molten metal 12 in this projecting region of the tubular element.
  • Fig. 4 shows a variant of a tubular element 22 in FIG Fig. 3c explained casting phase. It differs from the tubular element 2 only in that an inwardly projecting ring extension 18 is assigned at its lower end.
  • Fig. 5 shows a tube element 24 composed of several tube segments 25, 26 in the mold 1 in cross section.
  • the outer contour of the tubular element 24 is in turn adapted to the inner contour of the mold 1 in such a way that there is a uniformly thick gap 7 between them over the entire circumference.
  • These tube segments 25, 26 are, for example, flat-walled or corner-shaped, as illustrated, and advantageously mortared to one another. Depending on the size, more or fewer such pipe segments could also be used.
  • this ceramic tube element could be immersed in the melt after the melt supply has stopped while the strand is being lowered in the mold. This would only slightly reduce the level.
  • the ceramic tube element could be provided with a taper in cross-section in the casting direction in its outer and / or inner shape.
  • the tapering of the outer shape could be chosen so that it is adapted to the solidified strand shell, which increases in the casting direction. In this way, the space between the tubular element and the inner shape of the strand could be optimized.
  • the pipe element could theoretically also be made of metal, for example steel, or partly made of ceramic material and partly made of steel be made.
  • a design partially made of steel advantageously on the outside of the tubular element allows the tubular element to fuse with the melt located in the gap 7 between the tubular element and the mold, which, due to the solidification determined by the mold cooling, leads to a firm connection between the tubular element and the outer strand shell in the gap 7 , so that the weight 19 can be removed at a very early stage after the casting is finished.
  • the pipe element could also be pushed into the mold without this gap 7 and in this case have approximately the internal dimensions of the mold.
  • the heat-insulating effect of the tubular element in connection with the possible task of the insulating powder is advantageously selected such that, despite slowly progressing solidification within the tubular element, a liquid reservoir is held so long that the volume shrinkage in the strand located below the tubular element due to the solidification progressing faster there than can be approximately or completely compensated for in the melt located within the tube element.

Abstract

Bei einem Verfahren zum kontinuierlichen oder semi-kontinuierlichen Stranggiessen insbesondere bei einer Vertikalgiessanlage zum Abgiessen von Stahl wird der Strang (5) bei Giessende nach dem Anhalten der Schmelzenzufuhr in einer gekühlten Kokille (1) abgesenkt. Der Strang (5) wird dabei angehalten bevor der Füllstand (15') das untere Ende der Kokille (1) erreicht. Ein Rohrelement (2) wird mit seinem unteren Ende (2') derart in die Metallschmelze in der Kokille (1) eingetaucht, dass der Füllstand (15') der Metallschmelze annähernd bis zum oberen Ende der Kokille wie beim Giessen ansteigt. Durch diese einfache Verfahrensweise werden bessere Ausbringungsraten aufgrund des kürzeren wegzuschneidenden oberen Strangendes ermöglicht.In a method for continuous or semi-continuous continuous casting, in particular in a vertical casting installation for casting steel, the strand (5) is lowered in a cooled mold (1) after the melt has stopped supplying. The strand (5) is stopped before the fill level (15 ') reaches the lower end of the mold (1). A pipe element (2) is immersed with its lower end (2 ') in the molten metal in the mold (1) in such a way that the fill level (15') of the molten metal rises approximately to the upper end of the mold as in casting. This simple procedure enables better output rates due to the shorter top strand end that has to be cut away.

Description

Die Erfindung betrifft ein Verfahren zum kontinuierlichen oder semi-kontinuierlichen Stranggiessen insbesondere bei einer Vertikalgiessanlage zum Abgiessen von Stahl, bei dem bei Giessende nach dem Anhalten der Schmelzenzufuhr in einer gekühlten Kokille der Strang abgesenkt wird.The invention relates to a process for continuous or semi-continuous continuous casting, in particular in a vertical casting installation for casting steel, in which the strand is lowered in a cooled mold at the end of the casting after the melt supply has stopped in a cooled mold.

Derartige Vertikalgiessanlagen werden bekanntlich zur Herstellung von verhältnismässig kurzen Strängen mit grösseren Querschnittsformaten eingesetzt. Es wird dabei Metallschmelze aus einem metallurgischen Gefäss, wie aus einer Pfanne oder einem Zwischenbehälter, durch ein Giessrohr in eine wassergekühlte Kokille zum Beispiel aus Kupfermaterial zugeführt. Der sich darin bildende Strang wird vertikal nach unten bis zum Erreichen einer definierten Länge gegossen. Das Ausbringen dieser relativ kurzen Stränge wird jeweils durch die Volumenreduktion des vergossenen Materials, insbesondere von Stahl, bei der Erstarrung bestimmt. Diese Volumenreduktion führt dazu, dass sich ohne geeignete Gegenmassnahmen ein Trichter am oberen Ende des erstarrten Stranges bildet. Um diesen Trichter zu verringern oder gar zu verhindern und dadurch das Ausbringen der kontinuierlich oder semi-kontinuierlich vergossenen Stränge zu erhöhen, werden verschiedenen Verfahren vorgeschlagen.Such vertical casting plants are known to be used for the production of relatively short strands with larger cross-sectional formats. It melts metal from a metallurgical vessel, as from a pan or an intermediate container, fed through a pouring tube into a water-cooled mold, for example made of copper material. The strand that forms is poured vertically downwards until a defined length is reached. The output of these relatively short strands is determined in each case by the volume reduction of the potted material, in particular steel, during the solidification. This reduction in volume leads to the formation of a funnel at the upper end of the solidified strand without suitable countermeasures. Various methods are proposed to reduce or even prevent this funnel and thereby increase the output of the continuously or semi-continuously cast strands.

Zum Beispiel ist ein Verfahren bei einer solchen Vertikalgiessanlage gemäss der Druckschrift WO-A-2015/101 553 bekannt, bei dem nach dem Beenden des regulären Giessvorgangs weiter flüssiges Metall in einem bestimmten Ausmass zugeführt wird. Es kann zudem eine um den oberen Endbereich des Strangs positionierte Heizeinrichtung vorgesehen sein, die das flüssige Metallreservoir oben im Innern des Strangs steuert. Mindestens die bei der Erstarrung auftretende Schrumpfung der Metallschmelze kann damit ausgeglichen und der entstehende Schwindungshohlraum im oberen Strangbereich verkürzt werden.For example, a method in such a vertical casting system according to the document WO-A-2015/101 553 Known, in which liquid metal is supplied to a certain extent after the regular casting process has ended. A heating device positioned around the upper end region of the strand can also be provided, which controls the liquid metal reservoir at the top inside the strand. At least the shrinkage of the molten metal that occurs during solidification can thus be compensated for and the shrinkage cavity that is formed in the upper strand area can be shortened.

Es ist auch bekannt, auf die Kokille einen Hülsenkörper aus feuerfestem Material aufzusetzen und damit Raum für ein thermisch isoliertes Schmelzreservoir zu bilden, aus dem die Schmelze dann in den darunter befindlichen Kokillenbereich absinkt, in dem die Erstarrung des Strangs beginnt. Nach Beendigung der Schmelzenzufuhr kann aus diesem Reservoir die Volumenschrumpfung infolge der Erstarrung des Giessstranges ausgeglichen werden.It is also known to place a sleeve body made of refractory material on the mold and thus to form space for a thermally insulated melt reservoir, from which the melt then sinks into the mold area below, where the solidification of the strand begins. After the melt feed has ended, the volume shrinkage due to the solidification of the casting strand can be compensated for from this reservoir.

Diese bekannten Verfahren zum Verringern des Schwindungshohlraums bei Strängen oder Giessblöcken haben jedoch den Nachteil eines verhältnismässig sehr aufwendigen Aufbaus. Experimentelle Untersuchungen zum zweiten Verfahren haben gezeigt, dass der Übergang von der thermisch isolierten "Reservoirzone" zu der gekühlten Kokille kaum betriebssicher gestaltet werden kann.However, these known methods for reducing the shrinkage cavity in strands or casting blocks have the disadvantage of being relatively complex. Experimental investigations of the second method have shown that the transition from the thermally insulated "reservoir zone" to the cooled mold can hardly be made reliable.

Der Erfindung liegt die Aufgabe zugrunde, diese Nachteile weitgehend zu beheben und ein Verfahren nach der eingangs genannten Art zu schaffen, welches sich beim kontinuierlichen oder halbkontinuierlichen Giessen von relativ kurzen grossformatigen Strängen durch eine einfache Handhabung auszeichnet und eine höhere Ausbringungsrate des verwendbaren Strangs durch geringere Schwindungshohlräume und demzufolge auch Kostenersparnisse ermöglicht.The invention has for its object to largely overcome these disadvantages and to provide a method of the type mentioned, which is characterized by simple handling in the continuous or semi-continuous casting of relatively short large-sized strands and a higher yield rate of the usable strand by lower shrinkage cavities and consequently also enables cost savings.

Diese Aufgabe wird erfindungsgemäss nach den Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the features of claim 1.

Die erfindungsgemässe Anlage hat den Vorteil, dass nur ein Eintauchen des Rohrelementes in die Kokille und allenfalls eine Zugabe von isolierendem Giess- oder Abdeckpulver über die Metallschmelze nach Ende des Giessprozesses erforderlich ist. Durch diese einfache Verfahrensweise werden bessere Ausbringungsraten aufgrund des kürzeren wegzuschneidenden oberen Strangendes ermöglicht.The system according to the invention has the advantage that it is only necessary to immerse the tubular element in the mold and, if necessary, to add insulating casting or covering powder over the molten metal after the casting process has ended. This simple procedure enables better output rates due to the shorter top strand end to be cut away.

Damit das vorteilhaft aus feuerfestem Material bestehende Rohrelement nach dem Ende der Schmelzzufuhr in die Kokille einfach in dieselbe eingebracht werden kann, ist gemäss der Erfindung vorgesehen, dass die Aussenabmessungen des Rohrelementes geringfügig kleiner als die Innenabmessungen der Kokille sind, wobei der dazwischen gebildete Spalt so bemessen ist, dass das Spaltmass zum Beispiel ungefähr der Dicke der im normalen Giessprozess in der Kokille gebildeten Strangschale entspricht oder aber kleiner gewählt wird. Die in diesem Spalt befindliche Schmelze erstarrt mit einer durch die Kokillenkühlung vorgegebenen Erstarrungsgeschwindigkeit. Eine Verbindung zwischen der äusseren Strangschale und dem Rohrmaterial kann gleichzeitig als Halteelement für das Rohrelement dienen, während im Inneren des Rohrelementes der Erstarrungsprozess der Metallschmelze aufgrund der isolierenden Wirkung des Rohrelementes mit stark reduzierter Erstarrungsgeschwindigkeit fortgesetzt wird.So that the tubular element, which is advantageously made of refractory material, can simply be introduced into the mold after the melt has been supplied, the invention provides that the outer dimensions of the tubular element are slightly smaller than the inner dimensions of the mold, the gap formed between them being dimensioned in this way is that the gap dimension is, for example, approximately the thickness of the strand shell formed in the mold in the normal casting process corresponds or is chosen smaller. The melt in this gap solidifies at a solidification rate predetermined by the mold cooling. A connection between the outer strand shell and the tube material can simultaneously serve as a holding element for the tube element, while in the interior of the tube element the solidification process of the molten metal is continued at a greatly reduced rate of solidification due to the insulating effect of the tube element.

Vorteilhaft wird nach Giessende der oben noch flüssige Strang in der Kokille soweit abgesenkt, dass sich die nach dem Einsetzen des Rohrelementes zur Aussenseite desselben verdrängte Schmelze nicht über die Kokille hinausfliesst, sondern sich annähernd bis zum gleichen Füllstand wie beim Abgiessen anhebt.After the end of the casting, the strand which is still liquid in the mold is advantageously lowered to such an extent that the melt displaced to the outside after the insertion of the tube element does not flow out over the mold, but rather rises to approximately the same level as when casting.

Es ist dabei vorteilhaft, wenn die Aussenkontur des Rohrelementes der innenkontur der Kokille so angepasst ist, dass der dazwischen gebildete Spalt im gesamten Umfang gleichmässig dimensioniert ist.It is advantageous if the outer contour of the tubular element is adapted to the inner contour of the mold in such a way that the gap formed between them is uniformly dimensioned over the entire circumference.

Es ist fertigungstechnisch zweckmässig, wenn das Rohrelement eine über die gesamte Länge gleichmässige Wandstärke aufweist. Zur Steigerung seiner Stabilität in der Kokille und zur weiteren Erhöhung des Ausbringens kann seinem unteren Ende ein nach innen vorstehender Ringansatz zugeordnet sein.In terms of production technology, it is expedient if the tubular element has a uniform wall thickness over the entire length. To increase its stability in the mold and to further increase the output, an inwardly projecting ring shoulder can be assigned to its lower end.

Es kann auch vorteilhaft sein, dass das Rohrelement aus verschiedenen Rohrsegmenten zusammengesetzt wird, um zum Beispiel Rohrelemente für unterschiedliche Giessformate aus Segmentteilen modular aufzubauen.It can also be advantageous for the tube element to be composed of different tube segments, for example to modularly construct tube elements for different casting formats from segment parts.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher erläutert. Es zeigen:

Fig. 1
einen Längsschnitt vereinfacht und schematisch des Kokillenbereichs einer Vertikalgiessanlage mit einem Rohrelement vor dem Eintauchen in die Metallschmelze;
Fig. 2
einen schematischen Querschnitt einer rechteckigen Kokille und dem darin befindlichen Rohrelement;
Fig. 3a
bis Fig. 3d Längsschnitte des Kokillenbereichs nach dem erfindungsgemässen Verfahren, ebenfalls vereinfacht und schematisch dargestellt;
Fig. 4
einen Längsschnitt des Kokillenbereichs nach Fig. 1 mit einer Variante eines Rohrelementes im eingetauchten Zustand; und
Fig. 5
einen schematischen Querschnitt einer rechteckigen Kokille und einem darin befindlichen mehrteiligen Rohrelement.
The invention is explained in more detail below using an exemplary embodiment with reference to the drawing. Show it:
Fig. 1
a longitudinal section simplified and schematic of the mold area of a vertical casting plant with a tubular element before immersion in the molten metal;
Fig. 2
a schematic cross section of a rectangular mold and the tube element located therein;
Fig. 3a
to Fig. 3d Longitudinal sections of the mold area according to the inventive method, also simplified and shown schematically;
Fig. 4
a longitudinal section of the mold area Fig. 1 with a variant of a tubular element in the immersed state; and
Fig. 5
a schematic cross section of a rectangular mold and a multi-part tubular element located therein.

Fig. 1 zeigt schematisch den Kokillenbereich mit einer Kokille 1 einer Vertikalgiessanlage 10, weiche durch kontinuierliches oder semi-kontinuierliches Stranggiessen zum Herstellen insbesondere von kurzen grossformatigen Strängen dient. Bei semi-kontinuierliches Stranggiessen wird dabei ein vertikal nach unten aus der Kokille 1 auslaufender Strang 5 erzeugt, welcher von unten gestützt ist und eine Länge von beispielsweise einigen Metern bis 20 Metern aufweisen kann. Unterhalb der Kokille sind übliche Kühlzonen für das Erstarren des Strangs angeordnet, die jedoch nicht näher veranschaulicht sind. Fig. 1 schematically shows the mold area with a mold 1 of a vertical casting plant 10, which is used by continuous or semi-continuous continuous casting for the production, in particular, of short, large-format strands. In the case of semi-continuous continuous casting, a strand 5 which runs vertically downward from the mold 1 is produced, which is supported from below and can have a length of, for example, a few meters to 20 meters. Conventional cooling zones for solidifying the strand are arranged below the mold, but are not illustrated in any more detail.

Die erfindungsgemässe Verfahrensweise nach dem Ende der Schmelzenzufuhr in die Kokille, dem Giessende der Vertikalgiessanlage 10, ist in Fig. 3a bis Fig. 3d schematisch veranschaulicht, wie nachfolgend erläutert ist:
Fig. 3a zeigt die Kokille 1 während dem Giessen von Stahlschmelze durch ein Giessrohr 13 aus einem nicht näher gezeigten metallurgischen Gefäss, wie beispielsweise aus einer Pfanne oder aus einem als Zwischenbehälter dienenden Verteiler. Die Stahlschmelze wird dabei auf herkömmliche Weise bei einem gegebenen Füllstand 15 beim oberen Kokillenende fortwährend durch ein verstellbares Verschlussorgan, wie ein Stopfen oder ein Schiebeverschluss, geregelt eingegossen und entsprechend wird der Strang 5 mit einer Abzugsgeschwindigkeit aus der Kokille abgesenkt.The procedure according to the invention after the melt has been fed into the mold, the pouring end of the vertical casting system 10, is shown in 3a to 3d schematically illustrated as explained below:
Fig. 3a shows the mold 1 during the casting of molten steel through a pouring tube 13 from a metallurgical not shown Vessel, such as from a pan or from a distributor serving as an intermediate container. The molten steel is continuously poured in a conventional manner at a given fill level 15 at the upper end of the mold by an adjustable closing element, such as a stopper or a sliding closure, and the strand 5 is correspondingly lowered from the mold at a withdrawal speed.

Nach dem Giessende, bei dem der Strang 5 mit der vorgegebenen Länge gegossen ist, wird das Gefäss mit dem Giessrohr 13 entfernt und wie in Fig. 3b veranschaulicht ist, wird der Strang 5 und damit der Füllstand 15' in der Kokille abgesenkt. Bevor jedoch der Füllstand 15' am unteren Ende der Kokille 1 angelangt ist, wird der Strang angehalten.After the end of casting, in which the strand 5 is cast with the predetermined length, the vessel with the pouring tube 13 is removed and as in Fig. 3b is illustrated, the strand 5 and thus the fill level 15 'in the mold is lowered. However, before the fill level 15 'has reached the lower end of the mold 1, the strand is stopped.

Im nächsten Verfahrensschritt, wie dies aus Fig. 1 hervorgeht, wird ein Rohrelement 2 zum Beispiel mit einem Gewicht 19 mittels eines nicht näher gezeigten Manipulators in die Kokille 1 eingesetzt. Zum Verbinden des Rohrelementes mit dem darauf liegenden Gewicht sind Befestigungs- bzw. Kupplungsmittel in der Gestalt von beispielsweise ein- und ausziehbaren Bolzen 9 oder dergleichen vorgesehen, die in entsprechende Bohrungen des Rohrelementes lösbar hineingreifen.In the next step, like this Fig. 1 a pipe element 2, for example with a weight 19, is inserted into the mold 1 by means of a manipulator (not shown in more detail). To connect the tubular element with the weight lying thereon, fastening or coupling means in the form of, for example, retractable and extractable bolts 9 or the like are provided, which detachably engage in corresponding bores in the tubular element.

Wie aus Fig. 3c ersichtlich ist, wird dieses Rohrelement 2 erfindungsgemäss mit seinem unteren Ende 2' derart in die Metallschmelze in der Kokille 1 eingetaucht, dass der Füllstand der Metallschmelze wie beim Giessen annähernd bis zum oberen Ende der Kokille 1 ansteigt. Das Rohrelement 2 wird gegebenenfalls mittels des Gewichts 19 beschwert, und es bildet sich in diesem Rohrelement ein flüssiges Metallreservoir 12, welches oben mit einem wärmeisolierenden Material, vorzugsweise Abdeckpulver 11, abgedeckt werden kann.How out Fig. 3c It can be seen that this tube element 2 is immersed with its lower end 2 ′ into the molten metal in the mold 1 in such a way that the fill level of the molten metal rises almost to the upper end of the mold 1 as in casting. The pipe element 2 is weighted, if necessary, by means of the weight 19, and a liquid metal reservoir 12 is formed in this pipe element, which can be covered at the top with a heat-insulating material, preferably covering powder 11.

Gemäss Fig. 2 ist das Rohrelement 2 als hülsenförmiger Körper aus feuerfestem Material hergestellt, dessen Abmessungen geringfügig schmäler als die Innenabmessungen der Kokille 1 sind. Es ist dabei über den gesamten Umfang der Kokille 1 ein Spalt 7 gebildet, der so bemessen ist, dass sich das Rohrelement 2 innerhalb einer beim Giessen in der Kokille bildenden Strangschale 5' befindet, während im Inneren des Rohrelementes der Erstarrungsprozess der Stahlschmelze aufgrund der isolierenden Wirkung des Rohrelementes mit gegenüber den Gegebenheiten ausserhalb des Rohrelementes stark reduzierter Erstarrungsgeschwindigkeit fortgesetzt wird.According to Fig. 2 is the tubular element 2 as a sleeve-shaped body made of refractory material, the dimensions of which are slightly narrower than the internal dimensions of the mold 1. It is formed over the entire circumference of the mold 1, a gap 7 which is dimensioned such that the tube element 2 is within a strand shell 5 'forming during casting in the mold, while in the interior of the tube element the solidification process of the molten steel due to the insulating Effect of the tubular element is continued with a greatly reduced solidification speed compared to the conditions outside the tubular element.

Dabei ist die Aussenkontur des Rohrelementes 2 der Innenkontur der Kokille 1 so angepasst, dass der Spalt 7 zwischen ihnen im gesamten Umfang mit einer annähernd gleichmässigen Dicke d dimensioniert ist. Dadurch bildet die beim Eintauchen des Rohrelementes in den Spalt verdrängte Schmelze nach deren Erstarrung einen optimalen Haltering für das Rohrelement, welcher eine ebenfalls gleichmässige Wandstärke aufweist. Vorteilhaft ist dieser gebildete Spalt 7 etwa zwischen 1 und 10% der Innenabmessungen der Kokille 1 dimensioniert, damit ein optimaler Zustand durch diesen das Rohrelement umfassenden Haltering erzielt werden kann.The outer contour of the tubular element 2 is adapted to the inner contour of the mold 1 so that the gap 7 between them is dimensioned with an approximately uniform thickness d over the entire circumference. As a result, the melt displaced when the tube element is immersed in the gap after it has solidified forms an optimal retaining ring for the tube element, which also has a uniform wall thickness. This formed gap 7 is advantageously dimensioned approximately between 1 and 10% of the inner dimensions of the mold 1, so that an optimal condition can be achieved by this retaining ring comprising the tubular element.

Die Kokille und das Rohrelement sind im Querschnitt rechteckig ausgebildet. Sie könnten aber selbstverständlich auch andersförmig ausgestaltet sein, wie zum Beispiel rund, quadratisch, polygonal oder andersformatig.The mold and the tubular element are rectangular in cross section. Of course, they could also be designed differently, such as round, square, polygonal or other formats.

Das Rohrelement 2 wird nach Beendigung der Schmelzenzufuhr um eine solche Länge in die Kokille 1 eingetaucht, wie aus Fig. 3c entnommen werden kann, dass sein unteres Ende 2' annähernd der sich bildenden Tiefe 14 des Schrumpfungstrichters 12 beim oberen Strangende nach dem Erstarren des Strangs 5 und der Schmelze innerhalb des Rohrelementes entspricht. Unter Berücksichtigung der Erstarrung des Stranges als auch derjenigen innerhalb des Rohrelementes gleicht das im Innern des Rohrelementes befindliche Schmelzvolumen den Volumenschrumpf infolge Erstarrung des sich unterhalb des Rohrelementes befindlichen Stranges aus, wobei gewährleistet sein muss, dass die noch nicht erstarrte Schmelze aus dem inneren Rohrvolumen in den unteren Strang nachfliessen kann.The tube element 2 is immersed in the mold 1 after the end of the melt supply, as from Fig. 3c can be seen that its lower end 2 'approximately the depth 14 of the shrinking funnel 12 that forms at the upper end of the strand after the strand 5 solidifies and the melt within the tubular element equivalent. Taking into account the solidification of the strand as well as that within the tubular element, the melting volume inside the tubular element compensates for the volume shrinkage due to the solidification of the strand located below the tubular element, whereby it must be ensured that the not yet solidified melt from the inner tube volume into the can flow into the lower strand.

Das Rohrelement 2 ist vorzugsweise mit seiner Wandstärke derart bemessen, dass es im eingetauchten Zustand in der definierten Tiefe ein solches eingetauchtes Volumen aufweist, dass sich der Füllstand 15 der Metallschmelze wie beim Giessen annähernd bis zum oberen Ende der Kokille ergibt.The tube element 2 is preferably dimensioned with its wall thickness in such a way that, in the immersed state, it has such an immersed volume at the defined depth that the fill level 15 of the molten metal, as during casting, results approximately up to the upper end of the mold.

Darüberhinaus weist dieses Rohrelement 2 eine solche Länge auf, dass es im Zustand in der definierten eingetauchten Tiefe am gegenüberliegenden oberen Ende über die Kokille 1 hinaus vorstehen kann. An seinem oberen Ende ist es vorteilhaft mit einem Gewicht 19 beaufschlagt, welches ein Aufschwimmen des leichteren Feuerfestmaterials des Rohrelementes in der Schmelze verhindert und zudem als Verbindungsmittel mit dem Rohrelement zum Kuppeln mit dem Manipulator oder einem Kran dienen kann. Damit kann es von diesem über die Kokille herangeführt und anschliessend in diese hineingetaucht werden kann. Zudem kann in diesem vorstehenden Bereich des Rohrelementes dieses wärmeisolierende Material, vorzugsweise Abdeckpulver 11, auf die Metallschmelze 12 gefüllt werden.In addition, this tube element 2 has a length such that it can protrude beyond the mold 1 at the opposite upper end in the defined immersed depth. At its upper end it is advantageously loaded with a weight 19, which prevents the lighter refractory material of the tubular element from floating in the melt and can also serve as a connecting means with the tubular element for coupling with the manipulator or a crane. This allows it to be brought into the mold and then immersed in it. In addition, this heat-insulating material, preferably covering powder 11, can be filled onto the molten metal 12 in this projecting region of the tubular element.

Abschliessend wird gemäss Fig. 3d der Strang 5 zusammen mit dem Rohrelement 2 aus der Kokille herausgeführt und, nach Erstarren der Schmelze innerhalb des Rohrelementes 2, der Oberteil 12 des Strangs 5 mit dem darin eingetauchten Rohrelement 2 getrennt. Damit kann der mit dem Erstarren des gegossenen Metalls entstehende Schwindungshohlraum 14 kurz gehalten werden.Finally, according to Fig. 3d the strand 5 is led out of the mold together with the tube element 2 and, after the melt has solidified within the tube element 2, the upper part 12 of the strand 5 with the tube element 2 immersed therein is separated. So that with the shrinkage cavity 14 resulting from the solidification of the cast metal can be kept short.

Fig. 4 zeigt eine Variante eines Rohrelementes 22 in der mit Bezug auf Fig. 3c erläuterten Giessphase. Es unterscheidet sich vom Rohrelement 2 lediglich dadurch, dass an seinem unteren Ende ein nach innen vorstehender Ringansatz 18 zugeordnet ist. Fig. 4 shows a variant of a tubular element 22 in FIG Fig. 3c explained casting phase. It differs from the tubular element 2 only in that an inwardly projecting ring extension 18 is assigned at its lower end.

Fig. 5 zeigt ein aus mehreren Rohrsegmenten 25, 26 zusammengesetztes Rohrelement 24 in der Kokille 1 im Querschnitt. Die Aussenkontur des Rohrelementes 24 ist wiederum der Innenkontur der Kokille 1 so angepasst, dass ein gleichmässig dicker Spalt 7 zwischen ihnen über den gesamten Umfang vorhanden ist. Diese Rohrsegmente 25, 26 sind zum Beispiel wie dargestellt flachwandig bzw. eckförmig ausgebildet und vorteilhaft aneinander gemörtelt. Es könnten auch je nach Grösse mehr oder weniger solcher Rohrsegmente verwendet werden. Fig. 5 shows a tube element 24 composed of several tube segments 25, 26 in the mold 1 in cross section. The outer contour of the tubular element 24 is in turn adapted to the inner contour of the mold 1 in such a way that there is a uniformly thick gap 7 between them over the entire circumference. These tube segments 25, 26 are, for example, flat-walled or corner-shaped, as illustrated, and advantageously mortared to one another. Depending on the size, more or fewer such pipe segments could also be used.

Die Erfindung ist mit dem erläuterten Ausführungsbeispiel ausreichend dargetan. Als Variante könnte dieses keramische Rohrelement bereits nach dem Anhalten der Schmelzenzufuhr während dem Absenken des Strangs in der Kokille in die Schmelze eingetaucht werden. Damit würde sich der Füllstand nur geringfügig absenken.The invention is sufficiently demonstrated with the illustrated embodiment. As a variant, this ceramic tube element could be immersed in the melt after the melt supply has stopped while the strand is being lowered in the mold. This would only slightly reduce the level.

Das keramische Rohrelement könnte im Prinzip bei seiner Aussen- und/oder Innenform mit einer Verjüngung im Querschnitt in Giessrichtung versehen sein. Die Verjüngung der Aussenform könnte so gewählt sein, dass diese der erstarrten Strangschale, welche in Giessrichtung zunimmt, angepasst ist. So könnte der Zwischenraum vom Rohrelement und der Stranginnenform optimiert werden.In principle, the ceramic tube element could be provided with a taper in cross-section in the casting direction in its outer and / or inner shape. The tapering of the outer shape could be chosen so that it is adapted to the solidified strand shell, which increases in the casting direction. In this way, the space between the tubular element and the inner shape of the strand could be optimized.

Das Rohrelement könnte theoretisch auch aus Metall, zum Beispiel Stahl, oder teilweise aus keramischem Material und teilweise aus Stahl gefertigt sein. Eine Ausführung teilweise aus Stahl vorteilhaft auf der Aussenseite des Rohrelementes erlaubt eine Verschmelzung des Rohrelementes mit der im Spalt 7 zwischen Rohrelement und Kokille befindlichen Schmelze, was aufgrund der durch die Kokillenkühlung bestimmten Erstarrung zu einer festen Verbindung zwischen Rohrelement und der aussenseitigen Strangschale im Spalt 7 führt, so dass das Gewicht 19 zu einem sehr frühen Zeitpunkt nach dem Beenden des Giessens entfernt werden kann.The pipe element could theoretically also be made of metal, for example steel, or partly made of ceramic material and partly made of steel be made. A design partially made of steel advantageously on the outside of the tubular element allows the tubular element to fuse with the melt located in the gap 7 between the tubular element and the mold, which, due to the solidification determined by the mold cooling, leads to a firm connection between the tubular element and the outer strand shell in the gap 7 , so that the weight 19 can be removed at a very early stage after the casting is finished.

Das Rohrelement könnte auch ohne diesen Spalt 7 in die Kokille hineinschiebbar sein und dabei annähernd die Innenabmessungen der Kokille aufweisen.The pipe element could also be pushed into the mold without this gap 7 and in this case have approximately the internal dimensions of the mold.

Die wärmeisolierende Wirkung des Rohrelementes im Zusammenhang mit der allfälligen Aufgabe des isolierenden Pulvers ist vorteilhaft so gewählt, dass trotz langsam fortschreitender Erstarrung innerhalb des Rohrelementes ein Flüssigkeitsreservoir so lange gehalten wird, dass der Volumenschrumpf im unterhalb des Rohrelementes befindlichen Strang aufgrund der dort schneller fortscheitenden Erstarrung als in der innerhalb der Rohrelementes befindlichen Schmelze annähernd oder vollständig ausgeglichen werden kann.The heat-insulating effect of the tubular element in connection with the possible task of the insulating powder is advantageously selected such that, despite slowly progressing solidification within the tubular element, a liquid reservoir is held so long that the volume shrinkage in the strand located below the tubular element due to the solidification progressing faster there than can be approximately or completely compensated for in the melt located within the tube element.

Claims (13)

Verfahren zum kontinuierlichen oder semi-kontinuierlichen Stranggiessen insbesondere bei einer Vertikalgiessanlage zum Abgiessen von Stahl, bei dem der Strang (5) bei Giessende nach dem Anhalten der Schmelzenzufuhr in einer gekühlten Kokille (1) abgesenkt wird, dadurch gekennzeichnet, dass
der Strang (5) angehalten wird bevor der Füllstand (15') das untere Ende der Kokille (1) erreicht und dabei ein Rohrelement (2) mit seinem unteren Ende (2') derart in die Metallschmelze in der Kokille (1) eingetaucht wird, dass der Füllstand (15') der Metallschmelze annähernd bis zum oberen Ende der Kokille wie beim Giessen ansteigt.Process for continuous or semi-continuous continuous casting, in particular in a vertical casting installation for casting steel, in which the strand (5) is lowered in a cooled mold (1) at the end of the casting after the melt supply has stopped, characterized in that
the strand (5) is stopped before the fill level (15 ') reaches the lower end of the mold (1) and a pipe element (2) with its lower end (2') is immersed in the molten metal in the mold (1) that the fill level (15 ') of the molten metal rises almost up to the upper end of the mold as during casting. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass
die Aussenabmessungen des Rohrelements (2) geringfügig schmäler als die Innenabmessungen der Kokille (1) sind, wobei der dazwischen gebildete Spalt (7) über den gesamten Umfang der Kokille so bemessen ist, dass sich das Rohrelement (2) innerhalb einer beim Giessen in der Kokille bildenden Strangschale (5') befindet, während im Inneren des Rohrelements (2) der Erstarrungsprozess der Metallschmelze normal oder mit reduzierter Erstarrungsgeschwindigkeit fortgesetzt wird.A method according to claim 1, characterized in that
the outer dimensions of the tubular element (2) are slightly narrower than the inner dimensions of the mold (1), the gap (7) formed between them being dimensioned over the entire circumference of the mold in such a way that the tubular element (2) is within one during casting in the Mold shell forming strand shell (5 ') is located, while in the interior of the tubular element (2) the solidification process of the molten metal is continued normally or at a reduced solidification rate. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass
die Aussenabmessungen des Rohrelementes (2) den Innenabmessungen der Kokille (1) im Querschnitt gesehen so angepasst sind, dass der dazwischen gebildete Spalt (7) über den gesamten Umfang mit einer gleichmässigen Dicke (d) etwa zwischen 1 und 10% der Innenabmessungen der Kokille (1) versehen ist.A method according to claim 2, characterized in that
the outer dimensions of the tubular element (2) are adapted to the inner dimensions of the mold (1) seen in cross section so that the gap (7) formed between them over the entire circumference with a uniform thickness (d) between about 1 and 10% of the inner dimensions of the mold (1) is provided. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass
das Rohrelement (2) nach Beendigung der Schmelzenzufuhr um eine solche Länge in die Kokille (1) eingetaucht wird, dass sein unteres Ende (2') annähernd der sich bildenden Schrumpfungstiefe (14) beim oberen Strangende nach dem Erstarren des Strangs (5) entspricht.Method according to one of claims 1 to 3, characterized in that
the tube element (2) is immersed in the mold (1) by a length such that its lower end (2 ') approximately corresponds to the depth of shrinkage (14) that forms at the upper end of the strand after the strand (5) has solidified , Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass
das Rohrelement (2) mit seiner Wandstärke derart bemessen ist, dass es im eingetauchten Zustand in der definierten Tiefe ein solches eingetauchtes Volumen aufweist, dass sich der Füllstand (15) der Metallschmelze wie beim Giessen annähernd bis zum oberen Ende der Kokille einstellt.Method according to one of claims 1 to 4, characterized in that
the tube element (2) is dimensioned with its wall thickness in such a way that in the immersed state it has such an immersed volume in the defined depth that the fill level (15) of the molten metal adjusts itself almost to the upper end of the mold as during casting. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass
das Rohrelement (2) eine solche Länge aufweist, dass es im Zustand in der definierten eingetauchten Tiefe am gegenüberliegenden oberen Ende über der Kokille vorsteht und es an seinem oberen Ende mit einem Verbindungsmittel versehen ist, damit es von einem Manipulator über die Kokille herangeführt und anschliessend in diese hineingetaucht werden kann.Method according to one of claims 1 to 5, characterized in that
the tube element (2) has such a length that it protrudes in the defined immersed depth at the opposite upper end above the mold and is provided with a connecting means at its upper end so that it is brought over the mold by a manipulator and then can be immersed in them. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass
das Rohrelement (2) eine solche Länge aufweist, dass es im Zustand in der definierten eingetauchten Tiefe am gegenüberliegenden oberen Ende über der Kokille vorsteht und in diesem Bereich ein wärmeisolierendes Material, vorzugsweise Abdeckpulver (11), auf die Metallschmelze gefüllt wird.Method according to one of claims 1 to 5, characterized in that
the tube element (2) has such a length that it protrudes in the defined immersed depth at the opposite upper end above the mold and in this area a heat-insulating material, preferably covering powder (11), is filled onto the molten metal. Verwendung eines Rohrelementes für das Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass
das Rohrelement (2) mit seinen Aussenabmessungen im Querschnitt gesehen bzw. in seiner Länge den Innenabmessungen der Kokille (1) bzw. der Schrumpfungstiefe (14) angepasst ist.Use of a tubular element for the method according to one of claims 1 to 7, characterized in that
the tubular element (2) is seen in cross-section with its outer dimensions or its length is adapted to the inner dimensions of the mold (1) or the depth of shrinkage (14). Verwendung eines Rohrelementes nach Anspruch 8, dadurch gekennzeichnet, dass
das Rohrelement (2) aus einem keramischen feuerfesten Material hergestellt ist.Use of a tubular element according to claim 8, characterized in that
the tubular element (2) is made of a ceramic refractory material. Verwendung eines Rohrelementes nach Anspruch 8, dadurch gekennzeichnet, dass
das Rohrelement (2) aus einer Kombination aus einem Feuerfestmaterial und einem Stahlmantel hergestellt ist.Use of a tubular element according to claim 8, characterized in that
the tubular element (2) is made from a combination of a refractory material and a steel jacket. Verwendung eines Rohrelementes nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass
das Rohrelement (2) zylindrisch ausgebildet ist und über die gesamte Länge eine gleichmässige Wandstärke aufweist, oder dass an seinem einen Ende ein nach innen vorstehender Ringansatz (18) zugeordnet ist.Use of a tubular element according to claim 8 or 9, characterized in that
the tubular element (2) is cylindrical and has a uniform wall thickness over the entire length, or that an inwardly projecting ring extension (18) is associated at one end. Verwendung eines Rohrelementes nach Anspruch 8 bis 11, dadurch gekennzeichnet, dass
das Rohrelement (24) aus verschiedenen Rohrsegmenten (25, 26) zusammengesetzt ist.Use of a tubular element according to claim 8 to 11, characterized in that
the pipe element (24) is composed of different pipe segments (25, 26). Verwendung eines Rohrelementes nach Anspruch 8 bis 12, dadurch gekennzeichnet, dass
die wärmeisolierende Wirkung des Rohrelementes (2) so bemessen ist, dass die Erstarrung im Inneren des Rohrelementes so erfolgt, dass aus der Schmelze im Inneren des Rohrelementes der Volumenschrumpf aufgrund der Erstarrung im unterhalb des Rohrelementes befindlichen Stranges (5) annähernd oder vollständig ausgeglichen werden kann.Use of a tubular element according to claim 8 to 12, characterized in that
the heat-insulating effect of the tubular element (2) is dimensioned such that the solidification takes place in the interior of the tubular element such that the volume shrinkage due to the solidification in the strand (5) located below the tubular element can be approximately or completely compensated for from the melt in the interior of the tubular element ,
EP18183322.9A 2018-07-13 2018-07-13 Method for continuous casting, in particular for a vertical casting installation for pouring steel Active EP3593923B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18183322.9A EP3593923B1 (en) 2018-07-13 2018-07-13 Method for continuous casting, in particular for a vertical casting installation for pouring steel
PCT/EP2019/063964 WO2020011444A1 (en) 2018-07-13 2019-05-29 Method for strand casting, especially in a vertical casting plant for casting steel
CN201980046246.3A CN112512725A (en) 2018-07-13 2019-05-29 Continuous casting method for casting steel, in particular in vertical casting plants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18183322.9A EP3593923B1 (en) 2018-07-13 2018-07-13 Method for continuous casting, in particular for a vertical casting installation for pouring steel

Publications (2)

Publication Number Publication Date
EP3593923A1 true EP3593923A1 (en) 2020-01-15
EP3593923B1 EP3593923B1 (en) 2021-10-13

Family

ID=62951896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18183322.9A Active EP3593923B1 (en) 2018-07-13 2018-07-13 Method for continuous casting, in particular for a vertical casting installation for pouring steel

Country Status (3)

Country Link
EP (1) EP3593923B1 (en)
CN (1) CN112512725A (en)
WO (1) WO2020011444A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115283631B (en) * 2022-09-01 2023-08-01 一重集团大连工程技术有限公司 Thermal insulation riser device and control method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1546796A (en) * 1924-01-03 1925-07-21 Saunders Malcolm Apparatus and process for casting steel ingots
WO1981001810A1 (en) * 1979-12-26 1981-07-09 Sylvester Enterprises Inc Process and apparatus for casting rounds,slabs and the like
AU547236B2 (en) * 1981-12-24 1985-10-10 Uralsky Politekhnichesky Institut Imeni S.M.Kirova Semicontinuous casting process
JPH07144255A (en) * 1993-11-22 1995-06-06 Kobe Steel Ltd Vertical semicontinuous casting device for large cross section cast slab and carrying out method of cast slab
WO2002047850A1 (en) * 2000-12-12 2002-06-20 Netanya Plasmatec Ltd. Treating molten metals by moving electric arc
KR20110074153A (en) * 2009-12-24 2011-06-30 주식회사 포스코 Apparatus for casting of vertical type and method for casting using it
WO2015101553A2 (en) 2013-12-30 2015-07-09 Inteco Special Melting Technologies Gmbh Method and plant for the production of long ingots having a large cross-section

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60152349A (en) * 1984-01-18 1985-08-10 Nippon Steel Corp Casting method of terminal billet in continuous casting
JPS626737A (en) * 1985-07-01 1987-01-13 Nippon Steel Corp Continuous casting mold for steel
JPS63157744A (en) * 1986-12-19 1988-06-30 Kobe Steel Ltd Reducing method for top crop in continuous casting
JPH05245600A (en) * 1992-03-06 1993-09-24 Sumitomo Metal Ind Ltd Method for casting end part of cast slab in continuous casting
JP3289118B2 (en) * 1994-02-17 2002-06-04 新日本製鐵株式会社 Shrinkage hole reduction device in continuous casting
JP3256793B2 (en) * 1994-04-22 2002-02-12 新日本製鐵株式会社 Method and apparatus for preventing component mixing and reducing shrinkage holes in continuous casting of dissimilar steels
JPH08206801A (en) * 1995-02-01 1996-08-13 Kobe Steel Ltd Heat insulation method for finally solidified part in large cross sectional continuously cast bloom
DE10259335B4 (en) * 2002-12-18 2005-04-14 Refratechnik Holding Gmbh Covering agent for a top slag, process for its preparation and use of the covering agent
CN201913204U (en) * 2010-12-24 2011-08-03 中冶京诚工程技术有限公司 Crystallizer, casting blank production device, casting blank and ultra-large-section casting blank

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1546796A (en) * 1924-01-03 1925-07-21 Saunders Malcolm Apparatus and process for casting steel ingots
WO1981001810A1 (en) * 1979-12-26 1981-07-09 Sylvester Enterprises Inc Process and apparatus for casting rounds,slabs and the like
AU547236B2 (en) * 1981-12-24 1985-10-10 Uralsky Politekhnichesky Institut Imeni S.M.Kirova Semicontinuous casting process
JPH07144255A (en) * 1993-11-22 1995-06-06 Kobe Steel Ltd Vertical semicontinuous casting device for large cross section cast slab and carrying out method of cast slab
WO2002047850A1 (en) * 2000-12-12 2002-06-20 Netanya Plasmatec Ltd. Treating molten metals by moving electric arc
KR20110074153A (en) * 2009-12-24 2011-06-30 주식회사 포스코 Apparatus for casting of vertical type and method for casting using it
WO2015101553A2 (en) 2013-12-30 2015-07-09 Inteco Special Melting Technologies Gmbh Method and plant for the production of long ingots having a large cross-section

Also Published As

Publication number Publication date
EP3593923B1 (en) 2021-10-13
CN112512725A (en) 2021-03-16
WO2020011444A1 (en) 2020-01-16

Similar Documents

Publication Publication Date Title
DE3322424C2 (en)
DE1926867A1 (en) Die-casting process for casting metals with a high melting point and a casting machine for this
CH624861A5 (en)
EP3593923B1 (en) Method for continuous casting, in particular for a vertical casting installation for pouring steel
DE2104616A1 (en) Continuous casting device
DE2162977A1 (en) METHOD AND DEVICE FOR MANUFACTURING METAL RODS IN CONTINUOUS CASTING AND CONTINUOUSLY CAST METAL BAR MANUFACTURED BY THIS PROCESS
EP0231520B2 (en) Method and device for connecting a new continuously cast ingot in a continuous-casting machine
DE2442469C3 (en) Device for starting up a strand in horizontal continuous casting
DE1758681A1 (en) Device and method for casting metals
EP0083745B1 (en) Elongated outlet nozzle for a tundish
DE3502532C2 (en) Device for the continuous casting of a hollow metallic strand
DE60205168T2 (en) Method and device for vertical casting of rough blocks and ingot produced in this way
DE1252375B (en) Process for casting steel alloys using the low-pressure casting process and further processing of the cast parts
EP0398378A2 (en) Arrangement for connecting a new cast strand in continuous casting
DE19710887C2 (en) Use of a mold for the production of bars from light metal or a light metal alloy, in particular from magnesium or a magnesium alloy
DE751355C (en) Device and method for the continuous casting of hollow bolts or pipes made of metal
DE2457422C3 (en) Device for continuous casting from layers of metallic melt
EP3427863A1 (en) Method and system for the production of cast blocks from metal
DE2208494B2 (en) PROCESS FOR SEALING THE STARTING HEAD IN A CONTINUOUS CASTING CLOSURE
EP0325792B1 (en) Method for casting a steel strip in a steel strip plant
DE1931206A1 (en) Method and device for the continuous casting of metal
EP3351317A1 (en) Method and device for producing cast blocks
DE2208296C3 (en)
DE2024747C3 (en) Process for semicontinuous continuous casting, in particular of steel, and device for carrying out the process *
DE3216205C2 (en) Process for the continuous casting of metals and device for its implementation

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20200707

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20210720

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502018007414

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1437800

Country of ref document: AT

Kind code of ref document: T

Effective date: 20211115

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20211013

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220113

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220213

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220214

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220113

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220114

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502018007414

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20220714

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211013

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20220713

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20220731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220713

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220731

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220731

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220713

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220713

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20230724

Year of fee payment: 6

Ref country code: AT

Payment date: 20230712

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20230822

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20180713