EP0996513A1 - Method and device for producing slabs - Google Patents

Method and device for producing slabs

Info

Publication number
EP0996513A1
EP0996513A1 EP98934867A EP98934867A EP0996513A1 EP 0996513 A1 EP0996513 A1 EP 0996513A1 EP 98934867 A EP98934867 A EP 98934867A EP 98934867 A EP98934867 A EP 98934867A EP 0996513 A1 EP0996513 A1 EP 0996513A1
Authority
EP
European Patent Office
Prior art keywords
melt
mold
casting
section
supplied
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
EP98934867A
Other languages
German (de)
French (fr)
Other versions
EP0996513B1 (en
Inventor
Ulrich Urlau
Hans Jürgen SCHEMEIT
Gerhard Böcher
Peter Müller
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.)
Salzgitter AG
SMS Siemag AG
Original Assignee
Salzgitter AG
SMS Demag 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 Salzgitter AG, SMS Demag AG filed Critical Salzgitter AG
Publication of EP0996513A1 publication Critical patent/EP0996513A1/en
Application granted granted Critical
Publication of EP0996513B1 publication Critical patent/EP0996513B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D11/0408—Moulds for casting thin slabs
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0406—Moulds with special profile
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • 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 method for producing slabs, with a thickness D> 100 mm at casting speeds v ⁇ 3m / min, in a continuous casting installation in which a mold is supplied with melt from a storage container via an immersion spout and from the mouth side the strand shell encompassing a sump is withdrawn into a strand guide frame, in particular a continuous sheet casting installation, and a corresponding device for this.
  • FIG. 4 a baffle element is provided at the mouth of the immersion nozzle, which deflects the liquid melt to two openings on the narrow sides of the immersion nozzle.
  • FIG. 5 shows that two partial flows are created which, with high energy of each individual thread, lead to swirling of the melt.
  • an immersion nozzle in particular for thin slab casting, which has a lower section made of parallel side walls. Before entering the lower section, a transverse web is provided, which guides the melt flow in the direction of the extension of the lower flow shaft deflects. The narrow sides of this immersion nozzle, which is provided in particular for thin slab plants, are guided in parallel.
  • the diving nozzles known from the cited documents produce a pouring jet which flows into the depths at a relatively high speed
  • the invention has set itself the goal of creating a method and a corresponding device for producing slabs, in which concentrations of impurities are avoided and, in particular, acid-gas-resistant steel grades can also be cast on sheet-continuous casting plants.
  • the invention achieves the aim through the characterizing features of method claim 1 and device claim 5.
  • the liquid melt supplied to the mold enters the liquid sump of the slab in a broad front at speeds which are not significantly higher than the strand withdrawal speed.
  • the supplied melt has a rectangular profile and already has the same speed as the slab at a depth of not more than 2 m in the sump.
  • the immersion spout used for this purpose has narrow side walls that open conically at an angle ⁇ of 15 to 30 ° with respect to the center axis.
  • the inside width d of the casting part behaves
  • the profile produced by the proposed process in the mold also has a positive influence on the movement of the melt in the region of the melt level in the mold and on its behavior with regard to the mold powder.
  • the proposed method enables the production of slabs for steel grades with high demands both on the non-metallic degree of purity and on the freedom from segregation, as are required, for example, with acid gas-resistant steel grades.
  • the solidification time is reduced by the reduced inflow speed of the steel into the sump located in the strand shell.
  • the specific casting performance of the plants can be increased, on the one hand, or the specific, on the other hand
  • Secondary cooling can be reduced with a view to improved surface quality.
  • the shows 1 shows the area of immersion pouring / mold of a continuous casting device
  • FIG. 1 side view of a continuous caster
  • FIG. 1 shows a storage container 11 to which an immersion spout 12 is attached.
  • the immersion spout 12 has a tubular part 13 and on the mouth side a spade-shaped part 14 with the narrow sides 16 and the broad sides 17.
  • a throttle 15 is provided in the transition area between the two immersion pouring parts.
  • the spade-shaped part 14 extends to a depth T ⁇ into a mold 21 filled with melt S, which has narrow sides 22 and broad sides 23.
  • the current threads of the melt S are shown with the supplied melt Sz and the sump S B. It can be seen that the current threads penetrate into the melt S enveloped by a strand shell K with a view of the broad sides to a depth L.
  • the supplied current threads have a speed v ⁇ .
  • the flow threads In the area of the narrow sides 16 of the immersion nozzle, the flow threads have an angle ⁇ to the central axis I and move relatively early towards the narrow sides 22 of the mold and strive in the area of the level P of the melt to the center of the mold 21.
  • the view AA is shown with the mold 21, which has the narrow sides 22 and the broad sides 23, which form a rectangle with the width B and the thickness D and the area A.
  • the immersion nozzle 12 is arranged centrally in the cavity of the mold 21 with the broad sides 17 and the narrow sides 16, which form a rectangle with the width b and the thickness d and the area a.
  • FIG. 2 schematically shows a section through the continuous casting installation, here an arc continuous casting installation, with the storage container 11 and the immersion spout 12 with the tubular part 13 and the spade-shaped part 14, here the broad sides 17.
  • a throttle 15 arranged in the transition area of the immersion pouring parts 13, 14 in the transition area of the immersion pouring parts 13, 14 .
  • the mouth of the immersion pouring part 14 projects into the melt S located in the mold 21 to a depth T ⁇ .
  • the broad side walls 23 of the mold 21 are shown, the mouth-side end of which has formed a strand shell K from the slab, which envelops the melt S up to the sump tip S s .
  • the strand guide rollers 24 are arranged downstream of the mold 21.
  • the supplied melt S s penetrates at a speed v 'into the sump SB located in the mold, namely at a depth T with respect to the broad sides 23. Then the sump has a speed v B that the

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Forging (AREA)
  • Multi-Process Working Machines And Systems (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

The invention relates to a method for producing slabs having a thickness D of > 100 mm at casting speeds v < 3m/min. in a continuous casting installation, in which melt is fed to a casting die from a container by means of a submerged nozzle, from which a casting cup encompassing a crater is drawn out into a strand guide frame on the mouth side, specially a bow-type continuous casting machine. According to the invention the fed melt enters the casting die at a speed (vK) which, in relation to the strand draw-out speed VB, is vk : vB = 6 : 1 - 60 : 1 and the flow filaments of the fed melt are guided in such a way that they penetrate the crater at a depth L < 2 m in relation to the melt level in the form of a large face with a rectangular profiled cross-section. The invention also relates to a device for producing slabs.

Description

Verfahren und Vorrichtung zum Erzeugen von BrammenMethod and device for producing slabs
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zum Erzeugen von Brammen, mit einer Dicke D > 100 mm bei Gießgeschwindigkeiten v < 3m/min, in einer Stranggießanlage, bei der eine Kokille aus einem Vorratsbehälter über einen Tauchausguß Schmelze zugeführt und aus der mündungsseitig die einen Sumpf umgreifende Strangschale in ein Strangführungsgerüst, insbesondere einer Bogenstranggießanlage, abgezogen wird, und eine entsprechende Vorrichtung dazu.The invention relates to a method for producing slabs, with a thickness D> 100 mm at casting speeds v <3m / min, in a continuous casting installation in which a mold is supplied with melt from a storage container via an immersion spout and from the mouth side the strand shell encompassing a sump is withdrawn into a strand guide frame, in particular a continuous sheet casting installation, and a corresponding device for this.
Aus steel research 66 (1995) No. 7, Seite 287 bis 293 „Flow dynamics in thin slab caster moulds" ist ein Versuchsaufbau bekannt, bei dem ein an einem tundisch befestigter Tauchausguß in eine Kokille hineinragt. Die hier eingesetzte Kokille ist mit einer Dicke von etwa 60 mm das typische Maß für eine Anlage zum Erzeugen von Dünnbrammen und zeigt beim Einsatz eines eine offene Mündung aufweisenden Tauchausgußes (Fig. 10) einen zentralen Strahl, der tief in den Sumpf der Bramme hineinragt.From steel research 66 (1995) No. 7, pages 287 to 293, "Flow dynamics in thin slab caster molds", an experimental setup is known in which a diving nozzle attached to a tundish protrudes into a mold. The mold used here, with a thickness of about 60 mm, is the typical measure for one Plant for producing thin slabs and, when using an immersion spout with an open mouth (FIG. 10), shows a central jet which extends deep into the bottom of the slab.
In einer weiteren Ausgestaltung (Figur 4) ist an der Mündung des Tauchausgußes ein Prallelement vorgesehen, die die Flüssigschmelze zu zwei Öffnungen an den Schmalseiten des Tauchausgußes ablenkt. Die Figur 5 zeigt, daß zwei Teilströme entstehen, die mit hoher Energie jedes einzelnen Stromfadens zur Verwirbelung der Schmelze führen.In a further embodiment (FIG. 4), a baffle element is provided at the mouth of the immersion nozzle, which deflects the liquid melt to two openings on the narrow sides of the immersion nozzle. FIG. 5 shows that two partial flows are created which, with high energy of each individual thread, lead to swirling of the melt.
Aus DE 43 20 723 ist ein Eintauchausguß, insbesondere zum Dünnbrammengießen, bekannt, der einen unteren Abschnitt aus parallel geführten Seitenwänden aufweist. Vor Eintritt in den unteren Abschnitt ist ein Quersteg vorgesehen, welcher die Schmelzenströmung in Richtung der Weiterung des unteren Strömungsschachtes auslenkt. Die Schmalseiten dieses insbesondere für Dünnbrammenanlagen vorgesehenen Tauchausgußes sind parallel geführt.From DE 43 20 723 an immersion nozzle, in particular for thin slab casting, is known which has a lower section made of parallel side walls. Before entering the lower section, a transverse web is provided, which guides the melt flow in the direction of the extension of the lower flow shaft deflects. The narrow sides of this immersion nozzle, which is provided in particular for thin slab plants, are guided in parallel.
Die aus den genannten Schriften bekannten Tauchausgüsse erzeugen einen Gießstrahl, der mit relativ hoher Geschwindigkeit bis in entsprechende Tiefen in denThe diving nozzles known from the cited documents produce a pouring jet which flows into the depths at a relatively high speed
Sumpf eindringt.Swamp penetrates.
In Kenntnis des genannten Standes der Technik hat sich die Erfindung das Ziel gesetzt, ein Verfahren und eine entsprechende Vorrichtung zum Erzeugen von Brammen zu schaffen, bei der Konzentrationen von Verunreinigungen vermieden und insbesondere sauergasfeste Stahlgüten auch auf Bogenstranggießaniagen gießbar sind.Knowing the prior art mentioned, the invention has set itself the goal of creating a method and a corresponding device for producing slabs, in which concentrations of impurities are avoided and, in particular, acid-gas-resistant steel grades can also be cast on sheet-continuous casting plants.
Die Erfindung erreicht das Ziel durch die kennzeichnenden Merkmale des Verfahrensanspruchs 1 und des Vorrichtungsanspruchs 5.The invention achieves the aim through the characterizing features of method claim 1 and device claim 5.
Erfindungsgemäß tritt die der Kokille zugeführte flüssige Schmelze in breiter Front mit nicht wesentlich höhere Geschwindigkeiten im Vergleich zur Strangabzugsgeschwindigkeit in den flüssigen Sumpf der Bramme ein. Bezogen auf den Querschnitt weist die zugeführte Schmelze ein Rechteckprofil auf und besitzt bereits in einer Tiefe nicht größer als 2 m im Sumpf die gleiche Geschwindigkeit wie die Bramme.According to the invention, the liquid melt supplied to the mold enters the liquid sump of the slab in a broad front at speeds which are not significantly higher than the strand withdrawal speed. In relation to the cross-section, the supplied melt has a rectangular profile and already has the same speed as the slab at a depth of not more than 2 m in the sump.
Die Geschwindigkeit vκ der zugeführten Schmelze, welche in die Kokille eintritt, verhält sich zu der Strangabzugsgeschwindigkeit vB wie K : vB = 6 : 1 bis 60 : 1.The speed v κ of the supplied melt, which enters the mold, is related to the strand withdrawal speed v B as K: v B = 6: 1 to 60: 1.
In einer vorteilhaften Ausgestaltung der Erfindung wird die zugeführte flüssige Schmelze mit einem Eintrittsprofil in den Sumpf geführt, der als ein Rechteck ausgebildet ist, wobei sich die lichte Weite d des Rechtecks zur Schmalseite der Kokille D wie d : D = 1 : 3 bis 1 : 40 und die Breite b des Rechtecks zur Breitseite derIn an advantageous embodiment of the invention, the supplied liquid melt is guided into the sump with an entry profile which is designed as a rectangle, the inside width d of the rectangle facing the narrow side of the mold D being d: D = 1: 3 to 1: 40 and the width b of the rectangle to the broad side of the
Kokille B sich wie b : B = 1 : 7 bis 1 : 1 ,2 verhält.Mold B behaves like b: B = 1: 7 to 1: 1, 2.
Die den Tauchausguß verlassenden Stromfäden strömen in einem Breitenwinkel von α = 15 bis 30° zur Brammenabzugsrichtung in den Sumpf ein. Bezogen auf die Seite D der Kokillenschmalseite trifft die zugeführte flüssige Schmelze auf den Sumpf in einer Tiefe T = 0,1 bis 1 ,5 x D. Der hierzu eingesetzte Tauchausguß besitzt Schmalseitenwände, die bezogen auf die Mittenachse sich konisch unter einem Winkel α von 15 bis 30° öffnen. Der freie Querschnitt a der Mündung des Gießteils des Tauchausgusses verhält sich zum Innenquerschnitt A der Kokille wie a:A = 1:30 bis 1:300. Hierbei verhält sich die lichte Weite d des Gießteiis desThe stream threads leaving the dipping spout flow into the swamp at a width angle of α = 15 to 30 ° to the slab withdrawal direction. In relation to side D of the mold narrow side, the liquid melt supplied hits the sump in a depth T = 0.1 to 1.5 x D. The immersion spout used for this purpose has narrow side walls that open conically at an angle α of 15 to 30 ° with respect to the center axis. The free cross-section a of the mouth of the pouring part of the immersion spout relates to the inner cross-section A of the mold as a: A = 1:30 to 1: 300. Here, the inside width d of the casting part behaves
Tauchausgusses zur Schmalseite D der Kokille wie d:D = 1:2 bis 1:40.Immersion spout to the narrow side D of the mold as d: D = 1: 2 to 1:40.
Das durch das vorgeschlagene Verfahren in der Kokille erzeugte Profil hat darüber hinaus positiven Einfluß auf die Bewegung der Schmelze im Bereich des Schmelzenpegels in der Kokille und auf sein Verhalten bezüglich des Gießpulvers.The profile produced by the proposed process in the mold also has a positive influence on the movement of the melt in the region of the melt level in the mold and on its behavior with regard to the mold powder.
Bei dem erfindungsgemäßen Vergießen wurde überraschend festgestellt, daß die bekannten Konzentrationsunterschiede über den Brammenquerschnitt nicht auftraten und der Reinheitsgrad, bezogen auf nicht metallische Einschlüsse, im wesentlichen verbessert wurde.In the casting according to the invention, it was surprisingly found that the known concentration differences over the slab cross-section did not occur and the degree of purity, based on non-metallic inclusions, was substantially improved.
Durch das vorgeschlagene Verfahren wird die Erzeugung von Brammen für Stahlgüten mit hohen Anforderungen sowohl an den nicht metallischen Reinheitsgrad als auch an die Seigerungsfreiheit, wie sie beispielsweise bei sauergasbeständigen Stahlgüten gefordert werden, möglich.The proposed method enables the production of slabs for steel grades with high demands both on the non-metallic degree of purity and on the freedom from segregation, as are required, for example, with acid gas-resistant steel grades.
Weiterhin wird bei dem erfindungsgemäßen Vergießen durch die reduzierte Einströmgeschwindigkeit des Stahls in den sich in der Strangschale befindenden Sumpf die Durcherstarrungszeit reduziert. Hierdurch kann einerseits die spezifische Gießleistung der Anlagen erhöht werden oder andererseits die spezifischeFurthermore, in the casting according to the invention, the solidification time is reduced by the reduced inflow speed of the steel into the sump located in the strand shell. In this way, the specific casting performance of the plants can be increased, on the one hand, or the specific, on the other hand
Sekundärkühlung im Hinblick auf eine verbesserte Oberflächenqualität reduziert werden.Secondary cooling can be reduced with a view to improved surface quality.
Ein Beispiel der Erfindung ist in der beigefügten Zeichnung dargelegt.An example of the invention is set out in the accompanying drawing.
Dabei zeigt die Figur 1 den Bereich Tauchausguß/Kokille einer StranggießeinrichtungThe shows 1 shows the area of immersion pouring / mold of a continuous casting device
Figur 2 seitliche Ansicht einer BogenstranggießanlageFigure 2 side view of a continuous caster
Die Figur 1 zeigt einen Vorratsbehälter 11 , an dem ein Tauchausguß 12 befestigt ist.FIG. 1 shows a storage container 11 to which an immersion spout 12 is attached.
Der Tauchausguß 12 besitzt einen rohrförmigen Teil 13 und mündungsseitig einen spatenförmigen Teil 14 mit den Schmalseiten 16 und den Breitseiten 17. Im Übergangsbereich beider Tauchausgußteile ist eine Drossel 15 vorgesehen.The immersion spout 12 has a tubular part 13 and on the mouth side a spade-shaped part 14 with the narrow sides 16 and the broad sides 17. A throttle 15 is provided in the transition area between the two immersion pouring parts.
Mündungsseitig reicht der spatenförmige Teil 14 bis zu einer Tiefe Tτ in eine mit Schmelze S gefüllte Kokille 21, die Schmalseiten 22 und Breitseiten 23 besitzt.On the mouth side, the spade-shaped part 14 extends to a depth T τ into a mold 21 filled with melt S, which has narrow sides 22 and broad sides 23.
Im oberen Teil sind die Stromfäden der Schmelze S dargestellt mit der zugeführten Schmelze Sz und dem Sumpf SB. Es zeigt sich, daß die Stromfäden mit Blick auf die Breitseiten bis in eine Tiefe L in die von einer Strangschale K umhüllten Schmelze S eindringen. Die zugeführten Stromfäden haben eine Geschwindigkeit vκ. Im Bereich der Schmalseiten 16 des Tauchausgusses weisen die Stromfäden einen Winkel α zur Mittenachse I auf und bewegen sich relativ früh hin zu den Schmalseiten 22 der Kokille und streben im Bereich des Pegels P der Schmelze zum Zentrum der Kokille 21.In the upper part, the current threads of the melt S are shown with the supplied melt Sz and the sump S B. It can be seen that the current threads penetrate into the melt S enveloped by a strand shell K with a view of the broad sides to a depth L. The supplied current threads have a speed v κ . In the area of the narrow sides 16 of the immersion nozzle, the flow threads have an angle α to the central axis I and move relatively early towards the narrow sides 22 of the mold and strive in the area of the level P of the melt to the center of the mold 21.
Im unteren Bereich ist die Ansicht AA dargestellt mit der Kokille 21, die die Schmalseiten 22 und die Breitseiten 23 aufweisen, die ein Rechteck bilden mit der Breite B sowie der Dicke D und der Fläche A.In the lower area, the view AA is shown with the mold 21, which has the narrow sides 22 and the broad sides 23, which form a rectangle with the width B and the thickness D and the area A.
Zentrisch in den Hohlraum der Kokille 21 ist der Tauchausguß 12 angeordnet mit den Breitseiten 17 und den Schmalseiten 16, die ein Rechteck bilden mit der Breite b sowie der Dicke d und der Fläche a.The immersion nozzle 12 is arranged centrally in the cavity of the mold 21 with the broad sides 17 and the narrow sides 16, which form a rectangle with the width b and the thickness d and the area a.
Die Figur 2 zeigt schematisch einen Schnitt durch die Stranggießanlage, hier eine Bogenstranggießanlage, mit dem Vorratsbehälter 11 und dem Tauchausguß 12 mit dem rohrförmigen Teil 13 und dem spatenförmigen Teil 14, hier die Breitseiten 17. Im Übergangsbereich der Tauchausgußteile 13, 14 ist eine Drossel 15 angeordnet. Die Mündung des Tauchausgußteils 14 ragt in die sich in der Kokille 21 befindliche Schmelze S bis in eine Tiefe Tτ hinein. Von der Kokille 21 sind die Breitseitenwände 23 dargestellt, deren mündungsseitigen Ende sich von der Bramme eine Strangschale K gebildet hat, die die Schmelze S umhüllt bis hin zur Sumpfspitze Ss.FIG. 2 schematically shows a section through the continuous casting installation, here an arc continuous casting installation, with the storage container 11 and the immersion spout 12 with the tubular part 13 and the spade-shaped part 14, here the broad sides 17. In the transition area of the immersion pouring parts 13, 14 there is a throttle 15 arranged. The mouth of the immersion pouring part 14 projects into the melt S located in the mold 21 to a depth T τ . The broad side walls 23 of the mold 21 are shown, the mouth-side end of which has formed a strand shell K from the slab, which envelops the melt S up to the sump tip S s .
Der Kokille 21 nachgeordnet sind die Strangführungsrollen 24.The strand guide rollers 24 are arranged downstream of the mold 21.
Die zugeführte Schmelze Ss dringt mit einer Geschwindigkeit v« in den sich in der Kokille befindlichen Sumpf SB ein und zwar in einer Tiefe T bezogen auf die Breitseiten 23. Danach besitzt der Sumpf eine Geschwindigkeit vB, die derThe supplied melt S s penetrates at a speed v 'into the sump SB located in the mold, namely at a depth T with respect to the broad sides 23. Then the sump has a speed v B that the
Abzugsgeschwindigkeit der Bramme und damit auch der Strangschale K entspricht. Pull-off speed of the slab and thus also the strand shell K corresponds.
- 6 -- 6 -
PositionslistePosition list
SchmelzenzufuhrMelt supply
11 Vorratsbehälter 12 Tauchausguß11 reservoir 12 immersion spout
13 Rohrförmiger Teil13 tubular part
14 Spatenförmiger Teil14 Spade-shaped part
15 Drossel15 choke
16 Schmalseiten Tauchausguß 17 Breitseiten Tauchausguß16 narrow sides immersion spout 17 broad sides immersion spout
StranggießeinrichtungContinuous caster
21 Kokille21 mold
22 Kokillenschmalseite 23 Kokillenbreitseite22 mold narrow side 23 mold wide side
24 Strangführungsrollen24 strand guide rollers
I MittenachseI center axis
K Strangschale P PegelK strand shell P level
S SchmelzeS melt
Sz SchmelzenzufuhrSz melt feed
SB SumpfS B swamp
Ss Sumpfspitze T Eindringtiefe Schmelze SchmalseiteS s swamp tip T penetration depth melt narrow side
Tτ Tauchtiefe TauchausgußT τ immersion depth immersion nozzle
L Eindringtiefe Schmelze Breitseite vκ Strömungsgeschwindigkeit Schmelzenzufuhr vB Strömungsgeschwindigkeit Sumpf α Öffnungswinkel a Freier Querschnitt Mündung TauchausgußL Penetration depth of melt broadside v κ Flow velocity melt feed v B Flow velocity sump α Opening angle a Free cross section Mouth of immersion nozzle
A Innenquerschnitt Kokille d Lichte Weite GießteilA Internal cross section of mold d Clear width of casting
D Lichte Weite Schmalseitenkokille D Clear width narrow side mold

Claims

Patentansprüche claims
1. Verfahren zum Erzeugen von Brammen, mit einer Dicke D > 100 mm bei Gießgeschwindigkeiten v < 3m/min, in einer Stranggießanlage, bei der eine Kokille aus einem Vorratsbehälter über einen Tauchausguß Schmelze zugeführt und aus der mündungsseitig eine einen Sumpf umgreifende Strangschale in ein Strangführungsgerüst, insbesondere eine Bogenstranggießanlage, abgezogen wird, dadurch gekennzeichnet, daß die zugeführte Schmelze in die Kokille mit einer Geschwindigkeit (vκ) eintritt, die sich zur Strangabzugsgeschwindigkeit (vB) verhält wie vκ : vB = 6 : 1 bis 60 : 1 und daß die Stromfäden der zugeführten Schmelze in einer Weise geführt werden, daß sie bezogen auf den Schmelzenpegel in breiter Front im Querschnitt ein Rechteckprofii aufweisend in einer Länge L < 2 m in den Sumpf eindringen.1.Procedure for producing slabs, with a thickness D> 100 mm at casting speeds v <3m / min, in a continuous casting installation in which a mold is supplied with melt from a storage container via an immersion spout and a strand shell encompassing a sump from the mouth side Strand guiding stand, in particular a continuous sheet casting installation, is drawn off, characterized in that the supplied melt enters the mold at a speed (v κ ) which is related to the strand withdrawal speed (v B ) like v κ : v B = 6: 1 to 60: 1 and that the current threads of the supplied melt are guided in such a way that, based on the melt level, they penetrate the cross section of a rectangular profile having a length L <2 m into the swamp in a broad front.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die zugeführte flüssige Schmelze mit einem als Rechteck ausgebildeten Eintrittsprofil in den Sumpf einströmt, wobei sich die lichte Weite (d) des2. The method according to claim 1, characterized in that the liquid melt supplied flows with an inlet profile formed as a rectangle into the sump, the inside width (d) of the
Rechtecks zur Schmalseite der Kokille (D) wie d : D = 1:3 bis 1:40 und die Breite (b) des Rechtecks zur Breitseite der Kokille (B) wie b : B_= 1:7 bis 1:1,2 verhält.Rectangle to the narrow side of the mold (D) as d: D = 1: 3 to 1:40 and the width (b) of the rectangle to the broad side of the mold (B) as b: B_ = 1: 7 to 1: 1.2 .
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die den Schmalseiten (D) der Kokille zugewandten Stromfäden unter einem Winkel (α) von α = 15 bis 30° zur Brammenabzugsrichtung in den Sumpf einströmen. 3. The method according to claim 1 or 2, characterized in that the narrow sides (D) of the mold flow streams flow into the sump at an angle (α) of α = 15 to 30 ° to the slab withdrawal direction.
4. Verfahren nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß die über den Tauchausguß zugeführte flüssige Schmelze in einer Tiefe (T) auf den Sumpf trifft mit T = 0,1 bis 1 ,5 x D.4. The method according to any one of the preceding claims, characterized in that the liquid melt supplied via the immersion spout meets the bottom at a depth (T) with T = 0.1 to 1.5 x D.
5. Stranggießeinrichtung zum Erzeugen von nach Verfahrensanspruch 1 herstellten Brammen mit einem Vorratsbehälter, aus dem die Schmelze über einen Tauchausguß in eine Kokille mit einer lichten Weite (D) mit D > 100 mm geführt wird und dieser Tauchausguß mindestens ein Gießteil mit einem länglichen Querschnitt besitzt einschließlich eines Drosselelementes, das den in diesen Gießteil eintretende Hauptstrom der Schmelze in Geschwindigkeit und Strömungsform verringert, dadurch gekennzeichnet, daß der einen länglichen Querschnitt besitzende Gießteil in der Weise ausgestaltet ist, daß die Schmalseitenwände zur Mittenachse einen sich in Strömungsrichtung öffnenden Winkel α = 15 bis 30° aufweisen.5. Continuous casting device for producing slabs produced according to process claim 1 with a storage container, from which the melt is guided via a dip spout into a mold with a clear width (D) with D> 100 mm and this dip spout has at least one casting with an elongated cross section including a throttle element which reduces the main flow of the melt entering this casting part in terms of speed and flow, characterized in that the casting part, which has an elongated cross section, is designed in such a way that the narrow side walls form an angle α = 15 to Have 30 °.
6. Stranggießeinrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der freie Querschnitt (a) der Mündung des Gießteils des Tauchausgußes sich zum Innenquerschnitt (A) der Kokille verhält wie a : A = 1:30 bis 1:300, wobei die lichte Weite (d) des Gießteils des Tauchausgußes sich zur Schmalseite (D) der Kokille verhält wie d : D = 1 :2 bis 1:40. 6. Continuous casting device according to claim 5, characterized in that the free cross-section (a) of the mouth of the casting part of the immersion nozzle to the inner cross-section (A) of the mold behaves as a: A = 1:30 to 1: 300, the clear width ( d) the casting of the immersion nozzle to the narrow side (D) of the mold behaves like d: D = 1: 2 to 1:40.
EP98934867A 1997-06-03 1998-06-03 Method and device for producing slabs Expired - Lifetime EP0996513B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19724232A DE19724232C2 (en) 1997-06-03 1997-06-03 Method and device for producing slabs
DE19724232 1997-06-03
PCT/DE1998/001544 WO1998055250A1 (en) 1997-06-03 1998-06-03 Method and device for producing slabs

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EP0996513A1 true EP0996513A1 (en) 2000-05-03
EP0996513B1 EP0996513B1 (en) 2001-10-17

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KR (1) KR100585413B1 (en)
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BR (1) BR9810422A (en)
CA (1) CA2292473A1 (en)
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HU (1) HU221712B1 (en)
PL (1) PL337129A1 (en)
SK (1) SK166399A3 (en)
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AT408962B (en) * 2000-05-31 2002-04-25 Voest Alpine Ind Anlagen METHOD FOR PRODUCING A CONTINUOUS PRE-PRODUCT
AT507590A1 (en) † 2008-11-20 2010-06-15 Siemens Vai Metals Tech Gmbh METHOD AND CONTINUOUS CASTING SYSTEM FOR MANUFACTURING THICK BRAMMS
EP2100676B1 (en) * 2008-12-17 2012-06-06 Peter Kovác Continuous cast method
MY177954A (en) * 2014-06-11 2020-09-28 Arvedi Steel Eng S P A Thin slab nozzle for distributing high mass flow rates
CN110695349B (en) * 2019-11-21 2024-03-12 辽宁科技大学 CSP sheet billet continuous casting high-pulling-speed submerged nozzle and manufacturing method thereof
EP4374986A1 (en) * 2022-11-25 2024-05-29 SMS Concast AG Continuous casting installation, in particular for casting metallurgical long products, and a casting tube

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AU8433298A (en) 1998-12-21
DE19724232A1 (en) 1998-12-24
TR199903016T2 (en) 2000-07-21
ES2162461T3 (en) 2001-12-16
PL337129A1 (en) 2000-07-31
US6626229B2 (en) 2003-09-30
TW404867B (en) 2000-09-11
BR9810422A (en) 2000-07-25
CZ9904328A3 (en) 2002-03-13
KR100585413B1 (en) 2006-06-02
CA2292473A1 (en) 1998-12-10
JP2002501438A (en) 2002-01-15
JP4542631B2 (en) 2010-09-15
KR20010013247A (en) 2001-02-26
DE59801802D1 (en) 2001-11-22
US20030150588A1 (en) 2003-08-14
DK0996513T3 (en) 2001-11-19
HUP0004067A1 (en) 2001-03-28
DE19724232C2 (en) 1999-04-15
HU221712B1 (en) 2002-12-28
HUP0004067A3 (en) 2001-05-28
WO1998055250A1 (en) 1998-12-10
SK166399A3 (en) 2000-07-11
EP0996513B1 (en) 2001-10-17
ATE206971T1 (en) 2001-11-15
UA51790C2 (en) 2002-12-16

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