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EP1385656A1 - Method and device for continuously casting ingots, slabs or thin slabs - Google Patents

Method and device for continuously casting ingots, slabs or thin slabs

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Publication number
EP1385656A1
EP1385656A1 EP02769128A EP02769128A EP1385656A1 EP 1385656 A1 EP1385656 A1 EP 1385656A1 EP 02769128 A EP02769128 A EP 02769128A EP 02769128 A EP02769128 A EP 02769128A EP 1385656 A1 EP1385656 A1 EP 1385656A1
Authority
EP
European Patent Office
Prior art keywords
casting
strand
section
reduction
thickness
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
EP02769128A
Other languages
German (de)
French (fr)
Other versions
EP1385656B1 (en
Inventor
Hans Streubel
Axel Weyer
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 Siemag AG
Original Assignee
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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP1385656A1 publication Critical patent/EP1385656A1/en
Application granted granted Critical
Publication of EP1385656B1 publication Critical patent/EP1385656B1/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
    • B22D11/12—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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands

Definitions

  • the invention relates to a process for the continuous casting of blocks, slabs or thin slabs in a continuous casting installation which has, under a mold, strand guide segments which can be set at a mutual distance from one another, for example with pairs of rollers which can be acted upon by position or position-controlled hydraulic cylinders, the casting strand by conical placement of at least one of its strand guide segments is reduced in thickness in a soft reduction section reaching to the top of the swamp.
  • the invention also relates to an apparatus for performing the method.
  • the soft reduction process (SR process) is used to reduce the core porosity and increase the brake.
  • the soft reduction is preferably carried out in the directional driver area.
  • a prerequisite for an improvement in the internal structure quality is that the final solidification of the strand takes place in the conically adjusted soft reduction (SR section).
  • SR section conically adjusted soft reduction
  • the conical roller adjustment of the strand guide segments takes place either by means of a fixed adjustment by means of hydraulic cylinders and spacers, or by means of flexible adjustment, for example using position-controlled hydraulic cylinders.
  • the so-called operating window of the continuous caster for example the adjustment of the casting speed and other casting parameters, the intensity of the spray cooling or the steel quality, is predetermined by the number of SR roller pairs and the type of employment. As the number of rolls increases, the operating window can be enlarged. However, this increase is disproportionate to the additional costs it causes. Furthermore, it is only possible to influence the top of the sump by spray cooling to a limited extent.
  • the strand runs through a soft reduction section, at the entry of which it has not yet solidified, but at the end of which it should be solidified, for which purpose.
  • the casting speed represents an essential operating parameter.
  • a thickness reduction for example for thin slabs, of between 0.5 and 3 mm per meter of casting length is carried out.
  • the pairs of rollers of individual segments in the soft reduction section are adjusted more closely beyond the shrinkage behavior of the strand, in order to achieve an improvement in the inner strand quality in the area of residual solidification by structural compression.
  • EP 0 834 364 A1 describes a method and a device for high-speed continuous casting plants with a strand thickness reduction during solidification, the strand cross-section being linearly reduced over a minimum length of the strand guide directly under the mold after the so-called casting rolling, followed by a further strand -Reduction over the remaining strand guidance, the "soft reduction", until just before the final solidification or bottom tip.
  • This procedural measure prescribes the reduction of the strand cross section so that a critical deformation of the strand shell is not exceeded, taking into account the high casting speed and steel quality.
  • EP 0 177 796 B1 discloses a method for guiding and straightening a casting strand in the drawing and discharge area of a continuous sheet casting installation, wherein oppositely arranged rollers are held at a distance which can be adapted to the casting method by a spring force against the ferrous pressure of the casting strand. A cast strand area of increased strength is traced away and when it passes between opposing rollers the respective spring force is reduced by a low counterforce.
  • the slabs or blocks produced in continuous casting plants in accordance with the aforementioned documents serve as the starting material for rolling mill products for producing sheets or strips.
  • the object of the invention is to achieve an adaptation or enlargement of the operating window of a continuous casting installation to changing casting parameters and to obtain a comparatively uniform structure in the cast strand by influencing the bottom tip position.
  • the proposed reduction in thickness of the casting strand with a liquid core is used to set the format dimension such that the bottom of the sump is largely independent of the casting parameters in a section of the soft reduction section which leads to the required improvement of the internal quality of the casting strand leads.
  • the format thickness is reduced in such a way that the position of the swamp tip in the SR section is kept practically constant. So that's in a big one Casting speed range with a low level of mechanical engineering ensures a consistently good internal quality of the casting strand.
  • the size reduction of the strand with a liquid core can be set so that regardless of the steel quality, the intensity of the spray cooling and the casting speed, the position of the sump tip in the SR section is kept approximately constant.
  • An embodiment of the method according to the invention further provides that the number of roller pairs and their more or less close mutual adjustment in the region of the liquid core of the strand allows the casting process to be flexibly adapted to the casting speed.
  • the method provides that the arrangement and / or adjustment of the rolls for the reduction in thickness in the area of the liquid core of the casting strand are determined in accordance with the casting cross section or format cross section of the casting strand.
  • the method according to the invention provides that the thickness reduction is carried out directly in front of the SR section in the directional driver.
  • a continuous caster for carrying out the method according to the invention is designed on the device side such that the pairs of rollers for reducing the thickness of the casting strand 5 with a liquid core are arranged at different positions within and / or behind the strand support, but in front of the SR section.
  • FIG. 1 shows in a purely schematic representation a strand guide below a mold with an embodiment according to the invention and with a soft reduction section SR.
  • a first strand guide segment 2.1 for parallel strand guidance is located below the mold.
  • the sketch of the strand 5 below the melt inlet 6 into the mold 1 shows a first approach of a strand shell 8 that is being formed.
  • the strand 5 is subjected to a format reduction in the region of its liquid core 7 between the mold 1 and the soft reduction section SR by at least one pair of rollers 4, 4 '.
  • the format reduction by the roller pairs 4, 4 ' is followed by a strand guide segment 2.2 for parallel strand guidance of the casting strand 5.
  • the roller pairs 4, 4' are each away from or position-controlled hydraulic cylinders, not shown, so that they overcome the hydrostatic pressures of the melt 8 and thereby local size reduction or thickness reduction in the strand 5 z.
  • Another strand guide segment 2.3 for parallel strand guidance is arranged in the casting direction below the soft reduction section.
  • the number and pitch of the roller pairs 4, 4 'in the region of the liquid core 7 of the casting strand 5 allow the casting process to be flexibly adapted to the casting speed or a change thereof.
  • the format dimension is always set such that the sump tip 9 is largely independent of the aforementioned casting parameters in a section of the SR section which corresponds to the required Improvements in the internal quality of the casting strand leads.
  • the format thickness is reduced so that the position of the sump tip 9 in the SR section is kept practically constant. This ensures a consistently good internal quality of the cast product in a large casting speed range with little mechanical expenditure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Silicon Compounds (AREA)

Abstract

A continuously cast strand is subjected to soft reduction between the guide rollers below the mold and between the soft reduction stretch and the mold the strand is subjected to format or thickness reduction between at least one pair of position controlled guide rollers so that independently of the quality of the steel, the casting speed and the spray cooling, the position of the type of the mold cavity and hence the molten steel therein is maintained constant along the soft reduction stretch.

Description

Verfahren und Vorrichtung zum Stranggießen von Blöcken, Brammen oder DünnbrammenMethod and device for the continuous casting of blocks, slabs or thin slabs
Die Erfindung betrifft ein Verfahren zum Stranggießen von Blöcken, Brammen oder von Dünnbrammen in einer Stranggießanlage, die unterhalb einer Kokille im gegenseitigen Abstand einstellbare Strangfuhrungssegmente mit beispielsweise von weg- bzw. positionsgeregelten Hydraulikzylindern beaufschlagbaren Rollenpaaren aufweist, wobei der Gießstrang durch konisches Anstellen mindestens eines seiner Strangfuhrungssegmente in einer bis zur Sumpfspitze reichenden Soft-Reduktions-Strecke in der Dicke reduziert wird. Die Erfindung betrifft auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a process for the continuous casting of blocks, slabs or thin slabs in a continuous casting installation which has, under a mold, strand guide segments which can be set at a mutual distance from one another, for example with pairs of rollers which can be acted upon by position or position-controlled hydraulic cylinders, the casting strand by conical placement of at least one of its strand guide segments is reduced in thickness in a soft reduction section reaching to the top of the swamp. The invention also relates to an apparatus for performing the method.
Bei Stranggußanlagen für Brammen wird zur Reduktion der Kernporosität und der Kemseigerung unter anderem das Soft-Reduktion-Verfahren (SR- Verfahren) eingesetzt.In continuous casting plants for slabs, the soft reduction process (SR process) is used to reduce the core porosity and increase the brake.
Bei Blockanlagen erfolgt die Soft-Reduction vorzugsweise im Richttreiberbe- reich. Voraussetzung für eine Verbesserung der inneren Gefügequalität ist, daß die Enderstarrung des Stranges in der konisch angestellten Soft-Reduction (SR-Strecke) erfolgt. Eine Enderstarrung vor oder hinter der SR-Strecke führt nicht nur zu keiner Verbesserung der Innenqualität, sondern fallweise zu einer Verschlechterung.In the case of block systems, the soft reduction is preferably carried out in the directional driver area. A prerequisite for an improvement in the internal structure quality is that the final solidification of the strand takes place in the conically adjusted soft reduction (SR section). A final solidification in front of or behind the SR section not only does not lead to an improvement in the interior quality, but also in some cases to a deterioration.
Die konische Rollenanstellung der Strangfuhrungssegmente erfolgt entweder durch eine feste Einstellung mittels Hydraulikzylinder und Distanzstücken, oder mittels flexibler Anstellung, beispielsweise über positionsgeregelte Hydraulikzylinder. Das sogenannte Betriebsfenster der Stranggießanlage, beispielsweise die Anpassung der Gießgeschwindigkeit sowie anderer Gießparameter, die Intensität der Spritzkühlung bzw. die Stahlqualität, ist durch die Anzahl der SR- Rollenpaare und die Art der Anstellung vorgegeben. Mit zunehmender Rollenzahl kann, das Betriebsfenster vergrößert werden. Diese Vergrößerung steht jedoch in keinem Verhältnis zu den dadurch verursachten Mehrkosten. Weiterhin ist auch eine Beeinflussung der Sumpfspitzenlage durch die Spritzkühlung nur eingeschränkt möglich.The conical roller adjustment of the strand guide segments takes place either by means of a fixed adjustment by means of hydraulic cylinders and spacers, or by means of flexible adjustment, for example using position-controlled hydraulic cylinders. The so-called operating window of the continuous caster, for example the adjustment of the casting speed and other casting parameters, the intensity of the spray cooling or the steel quality, is predetermined by the number of SR roller pairs and the type of employment. As the number of rolls increases, the operating window can be enlarged. However, this increase is disproportionate to the additional costs it causes. Furthermore, it is only possible to influence the top of the sump by spray cooling to a limited extent.
Bei einem bekannten Verfahren gemäß der DE 41 38 740 A1 , durchläuft der Strang eine Soft-Reduktions-Strecke, bei deren Eintritt er noch nicht durcherstarrt ist, an deren Ende er jedoch durcherstarrt sein soll, wofür u. a. die Gießgeschwindigkeit einen wesentlichen Betriebsparameter darstellt. Im Bereich der Enderstarrung wird dabei eine Dickenreduktion, beispielsweise für Dünnbrammen, zwischen 0,5 und 3 mm pro Meter Gießlänge durchgeführt. Hierfür wer- den in der Soft-Reduktions-Strecke die Rollenpaare einzelner Segmente über das Schrumpfverhalten des Stranges hinausgehend enger eingestellt, um im Bereich der Resterstarrung durch Gefügeverdichtung eine Verbesserung der Strang-Innenqualität zu erzielen.In a known method according to DE 41 38 740 A1, the strand runs through a soft reduction section, at the entry of which it has not yet solidified, but at the end of which it should be solidified, for which purpose. a. the casting speed represents an essential operating parameter. In the area of final solidification, a thickness reduction, for example for thin slabs, of between 0.5 and 3 mm per meter of casting length is carried out. For this purpose, the pairs of rollers of individual segments in the soft reduction section are adjusted more closely beyond the shrinkage behavior of the strand, in order to achieve an improvement in the inner strand quality in the area of residual solidification by structural compression.
Die EP 0 834 364 A1 beschreibt ein Verfahren und eine Vorrichtung für Hoch- geschwindigkeits-Stranggießanlagen mit einer Strangdickenreduktion während der Erstarrung, wobei nach dem sogenannten Gießwalzen der Strangquerschnitt linear über eine Mindestlänge der Strangführung unmittelbar unter der Kokille reduziert wird, mit sich anschließender weiterer Strang-Reduktion über die restliche Strangführung, der "Soft-Reduktion", bis unmittelbar vor der Enderstarrung bzw. Sumpfspitze. Durch diese verfahrenstechnische Maßnahme wird die Strangquerschnittsreduktion so vorgegeben, daß eine kritische Deformation der Strangschale unter Berücksichtigung der hohen Gießgeschwindigkeit und Stahlgüte nicht überschritten wird. Die EP 0 177 796 B1 offenbart ein Verfahren zum Führen und Richten eines Gießstranges im Rieht- und Auslaufbereich einer Bogenstranggießanlage, wobei gegenüberliegend angeordnete Rollen von einer Federkraft gegen den fer- rosstatischen Druck des Gießstranges in einem dem Gießverfahren anpassbaren Abstand gehalten werden. Dabei wird ein Gießstrangbereich erhöhter Fe- stigkeit wegverfolgt und bei dessen Durchlauf zwischen gegenüberliegenden Rollen die jeweilige Federkraft durch eine geringe Gegenkraft reduziert.EP 0 834 364 A1 describes a method and a device for high-speed continuous casting plants with a strand thickness reduction during solidification, the strand cross-section being linearly reduced over a minimum length of the strand guide directly under the mold after the so-called casting rolling, followed by a further strand -Reduction over the remaining strand guidance, the "soft reduction", until just before the final solidification or bottom tip. This procedural measure prescribes the reduction of the strand cross section so that a critical deformation of the strand shell is not exceeded, taking into account the high casting speed and steel quality. EP 0 177 796 B1 discloses a method for guiding and straightening a casting strand in the drawing and discharge area of a continuous sheet casting installation, wherein oppositely arranged rollers are held at a distance which can be adapted to the casting method by a spring force against the ferrous pressure of the casting strand. A cast strand area of increased strength is traced away and when it passes between opposing rollers the respective spring force is reduced by a low counterforce.
Die in Stranggießanlagen entsprechend den vorgenannten Dokumenten hergestellten Brammen oder Blöcke dienen als Ausgangsmaterial für Walzwerkspro- dukte zum Erzeugen von Blechen oder Bändern.The slabs or blocks produced in continuous casting plants in accordance with the aforementioned documents serve as the starting material for rolling mill products for producing sheets or strips.
Der Erfindung liegt die Aufgabe zugrunde, eine Anpassung bzw. Vergrößerung des Betriebsfensters einer Stranggießanlage an sich ändernde Gießparameter zu erzielen und durch Beeinflussung der Sumpfspitzenlage ein vergleichsweise gleichbleibend optimales Gefüge im Gußstrang zu erhalten.The object of the invention is to achieve an adaptation or enlargement of the operating window of a continuous casting installation to changing casting parameters and to obtain a comparatively uniform structure in the cast strand by influencing the bottom tip position.
Zur Lösung der Aufgabe wird bei einem Verfahren der im Oberbegriff von Anspruch 1 genannten Art mit der Erfindung vorgeschlagen, daß der Gießstrang im Bereich seines flüssigen Kerns zwischen Kokille und der Soft-Reduktions- Strecke (SR-Strecke) durch wenigstens ein Rollenpaar einer Formatreduzierung unterworfen wird.To achieve the object is proposed in a method of the type mentioned in the preamble of claim 1 with the invention that the casting strand in the region of its liquid core between the mold and the soft reduction section (SR section) is subjected to a format reduction by at least one pair of rollers becomes.
In Abhängigkeit von den Gießparametern wird mittels der vorgeschlagenen Dik- kenreduzierung des Gießstranges mit flüssigem Kern die Formatabmessung so eingestellt, daß die Sumpfspitze weitestgehend unabhängig von den Gießparametern in einem Abschnitt der Soft-Reduktions-Strecke liegt, der zu der geforderten Verbesserung der Innenqualität des Gießstranges führt. Hierbei wird trotz zunehmender Gießgeschwindigkeit und/oder geänderter Spritzkühlung beispielsweise die Formatdicke derart reduziert, daß die Lage die Sumpfspitze in der SR-Strecke praktisch konstant gehalten wird. Damit ist in einem großen Gießgeschwindigkeitsbereich bei geringem maschinentechnischem Aufwand eine gleichbleibend gute Innenqualität des Gießstranges gewährleistet.Depending on the casting parameters, the proposed reduction in thickness of the casting strand with a liquid core is used to set the format dimension such that the bottom of the sump is largely independent of the casting parameters in a section of the soft reduction section which leads to the required improvement of the internal quality of the casting strand leads. Here, despite increasing casting speed and / or changed spray cooling, for example the format thickness is reduced in such a way that the position of the swamp tip in the SR section is kept practically constant. So that's in a big one Casting speed range with a low level of mechanical engineering ensures a consistently good internal quality of the casting strand.
Weitere Ausgestaltungen des Verfahrens nach der Erfindung sind entsprechend den Unteransprüchen vorgesehen.Further refinements of the method according to the invention are provided in accordance with the subclaims.
Dabei kann die Formatreduzierung des Stranges mit flüssigem Kern so eingestellt werden, daß unabhängig von der Stahlqualität, der Intensität der Spritzkühlung und der Gießgeschwindigkeit, die Lage der Sumpfspitze in der SR- Strecke annähernd konstant gehalten wird.The size reduction of the strand with a liquid core can be set so that regardless of the steel quality, the intensity of the spray cooling and the casting speed, the position of the sump tip in the SR section is kept approximately constant.
Damit wird trotz sich ändernder Betriebsparameter während des Gießprozesses ein gleichbleibend optimales Gefüge des gegossenen Stranges erzielt und eine unnötig erhöhte Belastung von Rollen und ihren Lagerungen innerhalb der Strangführung vermieden.In spite of changing operating parameters during the casting process, a consistently optimal structure of the cast strand is achieved and an unnecessarily increased load on rollers and their bearings within the strand guide is avoided.
Eine Ausgestaltung des Verfahrens nach der Erfindung sieht weiter vor, daß durch die Anzahl der Rollenpaare und ihre mehr oder weniger enge gegenseitige Anstellung im Bereich des flüssigen Kerns des Stranges eine flexible Anpassung des Gießprozesses an die Gießgeschwindigkeit vorgenommen wird.An embodiment of the method according to the invention further provides that the number of roller pairs and their more or less close mutual adjustment in the region of the liquid core of the strand allows the casting process to be flexibly adapted to the casting speed.
Und weiterhin sieht das Verfahren vor, daß Anordnung und/oder Anstellung der Rollen für die Dickenreduktion im Bereich des flüssigen Kerns des Gießstranges nach Maßgabe vom Gießquerschnitt bzw. Formatquerschnitt des Gießstranges bestimmt werden.Furthermore, the method provides that the arrangement and / or adjustment of the rolls for the reduction in thickness in the area of the liquid core of the casting strand are determined in accordance with the casting cross section or format cross section of the casting strand.
Und schließlich sieht das erfindungsgemäße Verfahren vor, daß die Dickenreduzierung unmittelbar vor der SR-Strecke im Richttreiber vorgenommen wird.And finally, the method according to the invention provides that the thickness reduction is carried out directly in front of the SR section in the directional driver.
Damit wird eine Anpassung bzw. Vergrößerung des Betriebsfensters der Stranggießanlage an sich ändernde Gießparameter kostengünstig erreicht, und insbesondere wird eine Beeinflussung der Sumpfspitzenlage weitestgehend unabhängig von den Gießparametern in der Weise gewährleistet, daß die Sumpfspitze stets in einem Abschnitt der SR-Strecke liegt, der zu der geforderten Verbesserung der Innenqualität des Gießstranges führt. Damit ist in einem großen Gießgeschwindigkeitsbereich bei geringem maschinentechnischen Aufwand ein gleichbleibend gutes Gußstranggefüge gewährleistet.In this way, an adaptation or enlargement of the operating window of the continuous casting installation to changing casting parameters is achieved in a cost-effective manner, and in particular an influencing of the bottom tip position is largely possible independent of the casting parameters in such a way that the bottom of the sump is always in a section of the SR section, which leads to the required improvement of the internal quality of the casting strand. This ensures a consistently good cast strand structure in a large casting speed range with little mechanical expenditure.
Eine Stranggießanlage zur Durchführung des erfindungsgemäßen Verfahrens ist vorrichtungsseitig so gestaltet, daß die Rollenpaare zur Dickenreduktion des Gießstranges 5 mit flüssigem Kern an verschiedenen Positionen innerhalb und/oder hinter der Strangstützung, jedoch vor der SR-Strecke angeordnet sind.A continuous caster for carrying out the method according to the invention is designed on the device side such that the pairs of rollers for reducing the thickness of the casting strand 5 with a liquid core are arranged at different positions within and / or behind the strand support, but in front of the SR section.
Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles.Details, features and advantages of the invention emerge from the following explanation of an exemplary embodiment shown schematically in the drawing.
Die Figur 1 zeigt in rein schematischer Darstellung eine Strangführung unterhalb einer Kokille mit einer Ausgestaltung nach der Erfindung sowie mit einer Soft-Reduktions-Strecke SR.FIG. 1 shows in a purely schematic representation a strand guide below a mold with an embodiment according to the invention and with a soft reduction section SR.
Im Anlagenteil der Strangführung .gemäß Figur 1 befindet sich unterhalb der Kokille ein erstes Strangführungssegment 2.1 zur parallelen Strangführung.In the plant part of the strand guide. According to FIG. 1, a first strand guide segment 2.1 for parallel strand guidance is located below the mold.
Die skizzenmäßige Darstellung des Stranges 5 unterhalb des Schmelzeneinlaufes 6 in die Kokille 1 zeigt einen ersten Ansatz einer sich bildenden Strang- schale 8.The sketch of the strand 5 below the melt inlet 6 into the mold 1 shows a first approach of a strand shell 8 that is being formed.
Erfindungsgemäß wird der Strang 5 im Bereich seines flüssigen Kerns 7 zwischen der Kokille 1 und der Soft-Reduktions-Strecke SR durch wenigstens ein Rollenpaar 4, 4' einer Formatreduzierung unterworfen. Der Formatreduzierung durch die Rollenpaare 4, 4' folgt ein Strangführungssegment 2.2 zur parallelen Strangführung des Gießstranges 5. Die Rollenpaare 4, 4' sind jeweils von weg- bzw. positionsgeregelten, nicht näher gezeigten Hydraulikzylindern beaufschlagt, so daß sie die hydrostatischen Drücke der Schmelze 8 überwinden und dadurch eine örtliche Formatreduzierung bzw. Dickenreduktion im Strang 5 z. B. 10 mm/m in Gießrichtung vor der Soft-Reduktions-Strecke SR mit einer Dik- kenreduzierung von beispielsweise 1 mm/m verursachen. In Gießrichtung un- terhalb der Soft-Reduktionsstrecke ist ein weiteres Strangführungssegment 2.3 zur parallelen Strangführung angeordnet.According to the invention, the strand 5 is subjected to a format reduction in the region of its liquid core 7 between the mold 1 and the soft reduction section SR by at least one pair of rollers 4, 4 '. The format reduction by the roller pairs 4, 4 'is followed by a strand guide segment 2.2 for parallel strand guidance of the casting strand 5. The roller pairs 4, 4' are each away from or position-controlled hydraulic cylinders, not shown, so that they overcome the hydrostatic pressures of the melt 8 and thereby local size reduction or thickness reduction in the strand 5 z. B. 10 mm / m in the casting direction in front of the soft reduction section SR with a thickness reduction of, for example, 1 mm / m. Another strand guide segment 2.3 for parallel strand guidance is arranged in the casting direction below the soft reduction section.
Anzahl und Anstellung der Rollenpaare 4, 4' im Bereich des flüssigen Kerns 7 des Gießstranges 5 erlauben eine flexible Anpassung des Gießprozesses an die Gießgeschwindigkeit bzw. eine Änderung derselben.The number and pitch of the roller pairs 4, 4 'in the region of the liquid core 7 of the casting strand 5 allow the casting process to be flexibly adapted to the casting speed or a change thereof.
Durch die Dickenreduzierung des Stranges 5 mit flüssigem Kern wird in Abhängigkeit von den Gießparametern wie Gießgeschwindigkeit, Stahlqualität, Gießtemperatur die Formatabmessung stets so eingestellt, daß die Sumpfspitze 9 weitestgehend unabhängig von den vorgenannten Gießparametern in einem Abschnitt der SR-Strecke liegt, der zu den geforderten Verbesserungen der Innenqualität des Gießstranges führt. Bei Zunehmender Gießgeschwindigkeit oder reduzierter Spritzkühlung wird beispielsweise die Formatdicke so reduziert, daß die Lage der Sumpfspitze 9 in der SR-Strecke praktisch konstant gehalten wird. Damit ist in einem großen Gießgeschwindigkeitsbereich bei geringem maschinentechnischen Aufwand eine gleichbleibend gute Innenqualität des Gußproduktes gewährleistet. By reducing the thickness of the strand 5 with a liquid core, depending on the casting parameters such as casting speed, steel quality, casting temperature, the format dimension is always set such that the sump tip 9 is largely independent of the aforementioned casting parameters in a section of the SR section which corresponds to the required Improvements in the internal quality of the casting strand leads. With increasing casting speed or reduced spray cooling, for example, the format thickness is reduced so that the position of the sump tip 9 in the SR section is kept practically constant. This ensures a consistently good internal quality of the cast product in a large casting speed range with little mechanical expenditure.

Claims

Patentansprüche claims
1. Verfahren zum Stranggiessen von Blöcken, Brammen, oder Dünnbrammen in einer Stranggießanlage, die unterhalb einer Kokille (1) im gegenseitigen Abstand einstellbare Strangfuhrungssegmente (2.1 bis 2.n) mit beispielsweise von weg- bzw. positionsgeregelten Hydraulikzylindern be- auf schlagbaren Rollenpaaren aufweist (4, 4'), wobei der Gießstrang (5) durch konisches Anstellen mindestens eines seiner Strangfuhrungssegmente in einer bis zur Sumpfspitze reichenden Soft-Reduktions-Strecke in der Dicke reduziert wird, dadurch gekennzeichnet, dass der Gießstrang (5) im Bereich seines flüssigen Kerns (7) zwischen1. Method for the continuous casting of blocks, slabs, or thin slabs in a continuous casting installation which has strand guide segments (2.1 to 2.n) which can be set at a mutual spacing below a mold (1) and which, for example, have stroke or position-controlled hydraulic cylinders that can be struck on roller pairs (4, 4 '), the casting strand (5) being reduced in thickness by conical placement of at least one of its strand guide segments in a soft reduction section extending to the bottom of the sump, characterized in that the casting strand (5) is in the region of its liquid Kerns (7) between
Kokille (1) und der Soft-Reduktions-Strecke (SR-Strecke) durch wenigstens ein Rollenpaar (4, 4') einer Formatreduzierung unterworfen wird.The mold (1) and the soft reduction section (SR section) are subjected to a format reduction by at least one pair of rollers (4, 4 ').
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Formatreduzierung des Gießstranges (5) mit flüssigem Kern so eingestellt wird, dass unabhängig von der Stahlqualität, der Intensität der Spritzkühlung und der Gießgeschwindigkeit, die Lage der Sumpfspitze in der SR-Strecke annähernd konstant gehalten wird.2. The method according to claim 1, characterized in that the format reduction of the casting strand (5) is set with a liquid core so that regardless of the steel quality, the intensity of the spray cooling and the casting speed, the position of the sump tip in the SR section almost constant is held.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass durch die Anzahl der Rollenpaare (4, 4') und ihre mehr oder weniger enge gegenseitige Anstellung im Bereich des flüssigen Kerns (7) des Gießstranges (5) eine flexible Anpassung des Gießprozesses an die3. The method according to claim 1 or 2, characterized in that by the number of pairs of rollers (4, 4 ') and their more or less close mutual adjustment in the region of the liquid core (7) of the casting strand (5) a flexible adaptation of the casting process to the
Gießgeschwindigkeit vorgenommen wird. Casting speed is made.
4. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass Anordnung und/oder Anstellung der Rollenpaare (4, 4') für die Dik- kenreduktion im Bereich des flüssigen Kerns des Gießstranges (5) nach Maßgabe vom Gießquerschnitt bzw. Formatquerschnitt des Gießstranges4. The method according to one or more of claims 1 to 3, characterized in that the arrangement and / or employment of the roller pairs (4, 4 ') for the thickness reduction in the region of the liquid core of the casting strand (5) in accordance with the casting cross section or Format cross section of the casting strand
(5) bestimmt werden.(5) can be determined.
5. Verfahren nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Dickenreduzierung unmittelbar vor der SR-Strecke vorgenommen wird.5. The method according to one or more of claims 1 to 4, characterized in that the thickness reduction is carried out immediately before the SR section.
6. Verfahren nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Rollen zur Dickenreduzierung des Gießstranges in der SR-Strecke positionsgeregelt angestellt werden.6. The method according to one or more of claims 1 to 5, characterized in that the rollers for reducing the thickness of the casting strand in the SR section are position-controlled.
7. Verfahren nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Rollen (4) zur Dickenreduktion im Bereich des flüssigen Kerns des7. The method according to one or more of claims 1 to 6, characterized in that the rollers (4) for reducing the thickness in the region of the liquid core of
Gießstranges positionsgeregelt angestellt werden.Casting strand are adjusted position-controlled.
8. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 7. dadurch gekennzeichnet, daß die Rollenpaare (4 ,4') zur Dickenreduktion des Gießstranges (5) mit flüssigem Kern an verschiedenen Positionen innerhalb und/oder unter der Strangstützung, jedoch vor der SR-Strecke angeordnet sind. 8. Device for performing the method according to one of claims 1 to 7, characterized in that the pairs of rollers (4, 4 ') for reducing the thickness of the casting strand (5) with a liquid core at different positions within and / or under the strand support, but before the SR route are arranged.
EP02769128A 2001-05-07 2002-05-02 Method for continuously casting ingots, slabs or thin slabs Expired - Lifetime EP1385656B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10122118A DE10122118A1 (en) 2001-05-07 2001-05-07 Method and device for the continuous casting of blocks, slabs and thin slabs
DE10122118 2001-05-07
PCT/EP2002/004801 WO2002090019A1 (en) 2001-05-07 2002-05-02 Method and device for continuously casting ingots, slabs or thin slabs

Publications (2)

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EP1385656A1 true EP1385656A1 (en) 2004-02-04
EP1385656B1 EP1385656B1 (en) 2004-12-29

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EP (1) EP1385656B1 (en)
JP (1) JP4846969B2 (en)
KR (1) KR100851899B1 (en)
CN (1) CN1287932C (en)
AT (1) ATE285861T1 (en)
CA (1) CA2446222C (en)
DE (2) DE10122118A1 (en)
ES (1) ES2233864T3 (en)
RU (1) RU2287401C2 (en)
WO (1) WO2002090019A1 (en)

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EP2543454B1 (en) * 2011-07-08 2019-09-04 Primetals Technologies Germany GmbH Process and apparatus for the manufacturing of long steel products in a continuous casting
RU2494834C1 (en) * 2012-06-27 2013-10-10 Открытое акционерное общество "Магнитогорский металлургический комбинат" Method of producing continuously-cast steel billets
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BR102015009492B1 (en) * 2015-01-30 2021-05-04 Jfe Steel Corporation continuous steel casting method
DE102017219464A1 (en) * 2017-10-30 2019-05-02 Sms Group Gmbh Continuous casting plant with single roll adjustment
CN109465415A (en) * 2018-12-07 2019-03-15 东北大学 A Sector Section Roller Structure at the End of Continuous Casting Solidification with Double Single-point Heavy Pressure

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RU2287401C2 (en) 2006-11-20
RU2003135621A (en) 2005-05-27
WO2002090019A1 (en) 2002-11-14
CN1287932C (en) 2006-12-06
JP4846969B2 (en) 2011-12-28
JP2004528987A (en) 2004-09-24
KR100851899B1 (en) 2008-08-13
DE50201906D1 (en) 2005-02-03
US20040129405A1 (en) 2004-07-08
CN1529643A (en) 2004-09-15
KR20030090778A (en) 2003-11-28
DE10122118A1 (en) 2002-11-14
US7025118B2 (en) 2006-04-11
CA2446222A1 (en) 2002-11-14
EP1385656B1 (en) 2004-12-29
ES2233864T3 (en) 2005-06-16
ATE285861T1 (en) 2005-01-15
CA2446222C (en) 2009-07-14

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