WO2010139438A1 - Method and device for guiding and orienting a strand in a continuous casting facility for large-sized round sections - Google Patents

Method and device for guiding and orienting a strand in a continuous casting facility for large-sized round sections Download PDF

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Publication number
WO2010139438A1
WO2010139438A1 PCT/EP2010/003273 EP2010003273W WO2010139438A1 WO 2010139438 A1 WO2010139438 A1 WO 2010139438A1 EP 2010003273 W EP2010003273 W EP 2010003273W WO 2010139438 A1 WO2010139438 A1 WO 2010139438A1
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WO
WIPO (PCT)
Prior art keywords
strand
straightening
heated
jacket
exhaust gases
Prior art date
Application number
PCT/EP2010/003273
Other languages
German (de)
French (fr)
Inventor
Thomas Meier
Klaus Von Eynatten
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 CN2010800250384A priority Critical patent/CN102481624A/en
Priority to US13/266,210 priority patent/US20120037331A1/en
Priority to RU2011153214/02A priority patent/RU2011153214A/en
Priority to JP2012513501A priority patent/JP5608224B2/en
Priority to CA2760254A priority patent/CA2760254A1/en
Priority to MX2011012527A priority patent/MX2011012527A/en
Publication of WO2010139438A1 publication Critical patent/WO2010139438A1/en

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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
    • B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
    • 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
    • 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
    • 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
    • B22D11/12—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
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
    • 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
    • B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening strands
    • 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
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • 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
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • 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
    • B22D11/16—Controlling or regulating processes or operations

Definitions

  • the invention relates to a method and a device for guiding and straightening the strand in a continuous casting plant for large-sized round profiles made of steel or similar materials.
  • Round profiles are products with approximately round or oval cross-section, which have a continuous curved surface and thus, unlike profiles with polygonal cross-section, are edge-free. This results in different conditions for them than for profiles with a polygonal strand cross-section.
  • This danger is largely independent of the format size of the profile, and it is especially in the transition from the radius to the stretch of the strand.
  • it is necessary to heat the edge regions of the profile by deliberately supplying heat energy along the entire guide track. Such a method is disclosed in WO 2007/131584 A1.
  • the emerging from the mold strand is bent over one or more reference points from the vertical direction at the mold exit in the horizontal direction.
  • the smallest possible bending radius is sought.
  • this leads to high compressive stresses on the underside or to corresponding tensile stresses on the upper side of the casting strand.
  • large-format profiles exists because the described temperature conditions within the strand cross-section the risk that the tensile stresses cause cracks on the top of the strand jacket, although these areas are exposed to the same uniform cooling as the rest of the strand jacket.
  • casting speeds are also very low. This increases the risk of cracking because the surface temperature of the strand is lower due to slow casting.
  • the invention has for its object to avoid these disadvantages and to provide a method and a device of the type mentioned, which ensures the crack-free bending of the casting along the straightening even with large-sized round profiles.
  • the stresses occurring there can be reduced so far that the strand during straightening withstands the same without cracking, while the strand core largely retains the degree of solidification achieved in each case.
  • the strand jacket is largely free of tension on the side.
  • the invention nevertheless provides for heating the strand casing in its entirety.
  • the heating power can be adapted to the stresses locally occurring in the strand casing along the straightening path. In this way it is possible to optimize the operation of the system procedurally.
  • the strand shell arranged in several preferably evenly - A -
  • Subzones of the guideline is heated.
  • the heating power is adaptable to the different requirements in the individual alignment sections.
  • the invention provides to heat the strand jacket preferably in the entire straightening section.
  • the invention also provides that the strand shell is heated by burning an air / gas mixture in a porous structure and bubbles of the resulting hot exhaust gases on the strand shell. This results in a flameless, volumetric combustion with a well controllable and stable combustion of the energy carrier, a high degree of conversion of the energy into radiant energy, a large control range of the introduced heating energy as well as exhaust gases flowing over a large area.
  • the device according to the invention for carrying out the method has at least one pore burner with a reactor filled with ceramic foam or similar structures, the hot exhaust gas of which flows around the strand jacket in its entirety. Since the risk of cracking according to the invention is greater on the upper side of the strand casing, it is expedient to direct the outlet opening of the reactor in a targeted manner there, so that the hot exhaust gases can first heat up the strand region which is the most susceptible to cracking.
  • the invention provides for equipping the device with a plurality of preferably uniformly distributed porous burners, which are incorporated into the intermediate spaces are set up between the straightening roller pairs of Richtrichtreiber issued.
  • a device saves space and, on the other hand, permits finely tuned heating of the cast strand.
  • the purposes of the invention to additionally provide the device with at least one pore burner arranged in front of the straightening device. This avoids the risk of cracking over a longer section of the strand guide.
  • Fig. 2 shows a pore burner for the device of FIG. 1, also schematically shown in section and enlarged.
  • the guiding and straightening device 1 shown in Fig. 1 is part of a continuous casting plant for producing large-sized round profiles made of steel or a similar material.
  • the molten steel is fed to a mold 2, at the Kokillenaustritt 3 a strand guide 4 is followed.
  • the casting strand 5 emerging from the mold 2 is guided in the upper section of the guide path through elongate tunnel elements 6a to 6d, in which the casting strand 5 is insulated or heated as the case may be.
  • These tunnel elements 6a to 6d can be completely closed or advantageously designed to be open at the bottom.
  • the first three tunnel elements 6a to 6c can be designed, for example, such that a cooling of the strand running through them takes place, while in the case of a subsequent tunnel element 6d insulation without cooling or even heating of the strand is effected.
  • a straightening device 7 with straightening roller pairs 7a to 7h is arranged in the adjoining section of the guide track. Between these, further narrow tunnel elements 8a to 8g are installed.
  • the now stiffened outside casting strand 5 is there addressed with the straightening roller pairs 7a to 7h and fed to a subsequent thereto Reduzierwalzwerk 9.
  • the tunnel elements 8b, 8d and 8f are equipped with pore burners 10.
  • One of these burners is shown schematically in FIG.
  • the tunnel elements 8b, 8d and 8f have an upper ceiling wall 11, on which the respective pore burner 10 is placed.
  • a wall not shown in detail which is advantageously provided with openings or the like, is provided, so that these tunnel elements insulate better.
  • This pore burner 10 consists essentially of a fuel gas and air supply port 12 and an adjoining reactor cell 13 which is filled with a filling 14 of porous ceramic foam. There the combustion reaction of the premixed fuel gas / air mixture takes place, with the result of a flameless volumetric combustion.
  • the exhaust gas flowing out of the reactor cell 13 completely flows around the casting strand 5 and advantageously heats the strand jacket 15 more in the upper region than on the lower side, without heating up the strand core 16 to any appreciable extent.
  • the pore burners 10 allow a very well controllable and stable combustion of the energy carrier, a very high degree of conversion of the energy into radiant energy, a uniform and large outflow exhaust gas and a very high control range of the integrated brought heating energy, so that the heating power of the individual burners is well adapted to the locally given requirements.
  • an additional pore burner 17 is arranged in the elongated tunnel element 6d of the strand guide. He is just like the pore burner 10 of the straightening device 7 is formed and has as well as this the function of heating the strand shell 15, to avoid the risk of cracking there. Since this danger increases with the progress of the solidification process, it is expedient in any case to arrange the pore burners 10 or 17 in the outlet-side region of the strand guide, in which the strand casing is already stiffened to a considerable extent. In this sense, of course, other burner arrangements are conceivable inside and outside the straightening device, in each case in adaptation to the respective conditions.
  • the embodiment described has the advantage that the hot exhaust gases flowing out of the reactor 13 directly heat the top of the strand, which is the most susceptible to cracking, while the lower side, which is less susceptible to cracking, is heated up by not so hot exhaust gases.
  • the control of the burner power takes place at the individual burners depending on their location in the guideline.
  • temperature sensors 18 are provided along the strand guide.
  • the plant described is equipped with a Kokillenaustritt 3 to the exit from the straightening device 7 continuously bent strand guide.
  • the invention is of course also applicable to systems whose strand guide after the Kokillenausstory initially runs vertically, only to then pass into a curved guide track.
  • a heating of the strand jacket could be done only on its upper side, so as to reduce at least these resulting in stretching the strand tensile stresses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Articles (AREA)
  • Tunnel Furnaces (AREA)
  • Gas Burners (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)

Abstract

The invention relates to a method and a device for guiding and orienting a strand (5) in a continuous casting facility for large-sized round sections made of steel or a similar material. In order to prevent the formation of cracks while the strand is oriented, the outer surface (15) of the strand is heated from above and from below inside the orienting track. For this purpose, porous burners (10, 17) are arranged in the discharge section of the directing track, the hot gas emitted from said burners flowing entirely around the outer surface (15) of the strand.

Description

Verfahren und Einrichtung zum Führen und Richten des Strangs in einer Stranggiessanlage für grossformatige Rundprofile Method and device for guiding and straightening the strand in a continuous casting plant for large-format round profiles
Die Erfindung betrifft ein Verfahren und eine Einrichtung zum Führen und Richten des Strangs in einer Stranggiessanlage für grossformatige Rundprofile aus Stahl oder ähnlichen Werkstoffen.The invention relates to a method and a device for guiding and straightening the strand in a continuous casting plant for large-sized round profiles made of steel or similar materials.
Rundprofile sind Erzeugnisse mit annährend rundem oder ovalem Querschnitt, die eine durchgehend gekrümmte Mantelfläche aufweisen und somit, anders als Profile mit polygonalem Querschnitt, kantenfrei sind. Daraus ergeben sich für sie andere Voraussetzungen als bei Profilen mit polygonalem Strangquerschnitt. Bei letzteren ist es hauptsächlich problematisch, dass sich der Giessstrang beim Erstarrungsprozess schneller an den Kanten als an den Breitseiten abkühlt, was die Gefahr von Rissbildungen in den Kantenbereichen mit sich bringt. Diese Gefahr besteht weitgehend unabhängig von der Formatgrösse des Profils, und sie besteht aber insbesondere beim Übergang vom Radius zur Streckung des Stranges. Um die Rissbildung zu vermeiden, ist es erforderlich, die Kantenbereiche des Profils durch gezieltes Zuführen von Wärmeenergie entlang der gesamten Führungsstrecke zu erwärmen. Ein solches Verfahren ist in der WO 2007/131584 A1 offenbart.Round profiles are products with approximately round or oval cross-section, which have a continuous curved surface and thus, unlike profiles with polygonal cross-section, are edge-free. This results in different conditions for them than for profiles with a polygonal strand cross-section. In the case of the latter, it is mainly problematic that the cast strand cools faster during the solidification process at the edges than at the broad sides, which entails the risk of cracking in the edge regions. This danger is largely independent of the format size of the profile, and it is especially in the transition from the radius to the stretch of the strand. In order to avoid the cracking, it is necessary to heat the edge regions of the profile by deliberately supplying heat energy along the entire guide track. Such a method is disclosed in WO 2007/131584 A1.
Bei kantenlosen Profilen ist diese Problematik nicht gegeben, weil ihre Masse umfänglich gleichmässig verteilt ist und keine Kanten vorhanden sind, die von zwei Seiten gekühlt werden. In dieser Hinsicht ist das Stranggiessen runder oder ovaler Profile prinzipiell unproblematisch. Bei grossformatigen Rundprofilen ergibt sich jedoch in der Strangführung das Problem, das bei ihnen die Abkühlung und Verfestigung der Schmelze am Aussenmantel des Strangs im Verhältnis zum Strangkern schneller erfolgt. Der Strang muss nämlich einerseits sehr stark abgekühlt werden, damit sich auch der Strangkern ausreichend abkühlt und verfestigt. Dadurch wird aber umso stärker die äussere Mantelsicht des Stranges abgekühlt.In edgeless profiles, this problem is not given, because their mass is circumferentially evenly distributed and no edges are present, which are cooled from two sides. In this respect, the continuous casting of round or oval profiles is basically unproblematic. In the case of large-format round profiles, however, the problem arises in the strand guide that the cooling and solidification of the melt on the outer casing of the strand takes place more rapidly in relation to the strand core. On the one hand, the strand must, on the one hand, be cooled very strongly so that the strand core also cools and solidifies sufficiently. As a result, however, the outer shell view of the strand is all the more cooled.
Der aus der Kokille austretende Strang wird über eine oder mehrere Richtpunkte von der senkrechten Richtung am Kokillenausgang in die horizontale Richtung umgebogen. Um den Platzbedarf und die Anlagenkosten klein zu halten, wird ein möglichst kleiner Biegeradius angestrebt. Das führt beim Richtvorgang zu hohen Druckspannungen auf der Unterseite bzw. zu entsprechenden Zugspannungen auf der Oberseite des Giessstrangs. Insbesondere bei grossformatigen Profilen besteht wegen der geschilderten Temperaturverhältnisse innerhalb des Strangquerschnittes die Gefahr, dass die Zugspannungen Risse auf der Oberseite des Strangmantels verursachen, obwohl diese Bereiche an sich der gleichen gleichmässigen Kühlung wie der restliche Strangmantel ausgesetzt sind. Bei sehr grossen Rundprofilen sind zudem die Giessgeschwindig- keiten sehr klein. Dadurch wird die Gefahr von Rissbildungen erhöht, weil die Oberflächentemperatur des Strangs infolge des langsamen Giessens tiefer ist.The emerging from the mold strand is bent over one or more reference points from the vertical direction at the mold exit in the horizontal direction. In order to keep the space requirement and the equipment costs small, the smallest possible bending radius is sought. During the straightening process, this leads to high compressive stresses on the underside or to corresponding tensile stresses on the upper side of the casting strand. Especially with large-format profiles exists because the described temperature conditions within the strand cross-section the risk that the tensile stresses cause cracks on the top of the strand jacket, although these areas are exposed to the same uniform cooling as the rest of the strand jacket. With very large round profiles, casting speeds are also very low. This increases the risk of cracking because the surface temperature of the strand is lower due to slow casting.
Der Erfindung liegt die Aufgabe zugrunde, diese Nachteile zu vermeiden und ein Verfahren und eine Einrichtung der eingangs genannten Art zu schaffen, die auch bei grossformatigen Rundprofilen das rissfreie Umbiegen des Giessstrangs entlang der Richtstrecke gewährleistet.The invention has for its object to avoid these disadvantages and to provide a method and a device of the type mentioned, which ensures the crack-free bending of the casting along the straightening even with large-sized round profiles.
Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass der Strangmantel innerhalb der Richtstrecke zumindest oberseitig aufgeheizt wird.This object is achieved according to the invention in that the strand casing is heated within the straightening path, at least on the upper side.
Dadurch können insbesondere die dort auftretenden Zuspannungen soweit abgebaut werden, dass der Strang beim Richten desselben ohne Rissbildung standhält, während der Strangkern den jeweils erreichten Erstarrungsgrad weitgehend unverändert beibehält. Der Strangmantel ist seitlich weitgehend spannungsfrei. Zwecks einer einfachen Betriebsweise sieht die Erfindung dennoch vor, den Strangmantel vollumfänglich aufzuheizen.As a result, in particular, the stresses occurring there can be reduced so far that the strand during straightening withstands the same without cracking, while the strand core largely retains the degree of solidification achieved in each case. The strand jacket is largely free of tension on the side. For the purpose of a simple mode of operation, the invention nevertheless provides for heating the strand casing in its entirety.
Die Heizleistung kann erfindungsgemäss den im Strangmantel entlang der Richtstrecke örtlich auftretenden Spannungen angepasst werden. Auf diese Weise ist es möglich, die Betriebsweise der Anlage verfahrenstechnisch zu optimieren.According to the invention, the heating power can be adapted to the stresses locally occurring in the strand casing along the straightening path. In this way it is possible to optimize the operation of the system procedurally.
In diesem Sinne ist es auch gemäss der Erfindung vorgesehen, dass der Strangmantel in mehreren vorzugsweise gleichmässig angeordneten - A -In this sense, it is also provided according to the invention that the strand shell arranged in several preferably evenly - A -
Teilzonen der Richtstrecke aufgeheizt wird. Dadurch ist die Heizleistung den unterschiedlichen Anforderungen in den einzelnen Richtstreckenabschnitten anpassbar.Subzones of the guideline is heated. As a result, the heating power is adaptable to the different requirements in the individual alignment sections.
Die beim Richten des Strangs auftretenden Spannungen sind naturge- mäss im Bereich der Streckung der Strangführung besonders gross. Aus diesem Grund sieht die Erfindung vor, den Strangmantel vorzugsweise im gesamten Richtstreckenabschnitt aufzuheizen.The stresses occurring during straightening of the strand are, of course, particularly great in the area of the stretch of the strand guide. For this reason, the invention provides to heat the strand jacket preferably in the entire straightening section.
Zwecks einer gleichmässigen, feinfühlig steuerbaren und die Strangoberfläche schonenden Aufheizung sieht die Erfindung auch vor, dass der Strangmantel durch Verbrennen eines Luft/Gas-Gemisches in einem porösen Gefüge und Blasen der entstehenden heissen Abgase auf den Strangmantel aufgeheizt wird. Daraus ergibt sich eine flammenlose, vo- lumetrische Verbrennung mit einer gut kontrollierbaren und stabilen Verbrennung des Energieträgers, einem hohen Umwandlungsgrad der Energie in Strahlungsenergie, einem grossen Regelbereich der eingebrachten Heizenergie sowie grossflächig ausströmenden Abgasen.For the purpose of a uniform, sensitive controllable and the strand surface gentle heating, the invention also provides that the strand shell is heated by burning an air / gas mixture in a porous structure and bubbles of the resulting hot exhaust gases on the strand shell. This results in a flameless, volumetric combustion with a well controllable and stable combustion of the energy carrier, a high degree of conversion of the energy into radiant energy, a large control range of the introduced heating energy as well as exhaust gases flowing over a large area.
Die erfindungsgemässe Einrichtung zur Durchführung des Verfahrens weist mindestens einen Porenbrenner mit einem mit Keramikschaum oder ähnlichen Strukturen gefüllten Reaktor auf, dessen heissen Abgase den Strangmantel vollumfänglich umströmen. Da die Rissgefahr erfah- rungsgemäss auf der Oberseite des Strangmantels grösser ist, ist es zweckmässig, die Austrittsöffnung des Reaktors gezielt dorthin zu richten, damit die heissen Abgase zuerst den am stärksten rissgefährdeten Strangbereich aufheizen können.The device according to the invention for carrying out the method has at least one pore burner with a reactor filled with ceramic foam or similar structures, the hot exhaust gas of which flows around the strand jacket in its entirety. Since the risk of cracking according to the invention is greater on the upper side of the strand casing, it is expedient to direct the outlet opening of the reactor in a targeted manner there, so that the hot exhaust gases can first heat up the strand region which is the most susceptible to cracking.
Da die Rissgefahr insbesondere innerhalb der Richttreibereinrichtung im auslaufseitigen Strangführungsbereich am grössten ist, sieht die Erfindung vor, die Einrichtung mit mehreren vorzugsweise gleichmässig verteilt angeordneten Porenbrennern auszustatten, die in den Zwischen- räumen zwischen den Richtwalzenpaaren der Richttreibereinrichtung aufgestellt sind. Eine solche Einrichtung ist einerseits platzsparend und ermöglicht andererseits eine fein abgestimmte Aufheizung des Giess- strangs.Since the risk of cracking is greatest, especially within the straightening device in the outlet-side strand guide region, the invention provides for equipping the device with a plurality of preferably uniformly distributed porous burners, which are incorporated into the intermediate spaces are set up between the straightening roller pairs of Richtrichtreibereinrichtung. On the one hand, such a device saves space and, on the other hand, permits finely tuned heating of the cast strand.
Bei besonders grossen Formaten ist es im Sinne der Erfindung zweck- mässig, die Einrichtung zusätzlich mit mindestens einem vor der Richttreibereinrichtung angeordneten Porenbrenner zu versehen. Damit wird der Rissbildungsgefahr über einen längeren Abschnitt der Strangführung vorgebeugt.For particularly large formats, it is expedient for the purposes of the invention to additionally provide the device with at least one pore burner arranged in front of the straightening device. This avoids the risk of cracking over a longer section of the strand guide.
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher erläutert. Es zeigen:The invention will be explained in more detail with reference to an embodiment with reference to the drawing. Show it:
Fig. 1 die erfindungsgemässe Führungs- und Richteinrichtung, in derFig. 1, the inventive guide and straightening device in the
Seitenansicht schematisch dargestellt, und Fig. 2 einen Porenbrenner für die Einrichtung aus Fig. 1 , ebenfalls schematisch, im Schnitt und vergrössert dargestellt.Side view shown schematically, and Fig. 2 shows a pore burner for the device of FIG. 1, also schematically shown in section and enlarged.
Die in Figu.1 gezeigte Führungs- und Richteinrichtung 1 ist Teil einer Stranggiessanlage zum Erzeugen grossformatiger Rundprofile aus Stahl oder einem ähnlichen Werkstoff. Der geschmolzene Stahl wird einer Kokille 2 zugeführt, an deren Kokillenaustritt 3 eine Strangführung 4 sich anschliesst. Der aus der Kokille 2 austretende Giesstrang 5 wird im oberen Abschnitt der Führungsstrecke durch längliche Tunnelelemente 6a bis 6d hindurchgeführt, in welchen der Giessstrang 5 je nachdem isoliert oder erwärmt wird. Diese Tunnelelemente 6a bis 6d können rundum geschlossen oder vorteilhaft unten offen ausgestaltet sein. Die ersten drei Tunnelelemente 6a bis 6c können zum Beispiel so ausgebildet sein, dass eine Abkühlung des durch diese laufenden Stranges erfolgt, indessen bei einem nachfolgenden Tunnelelement 6d eine Isolierung ohne Abkühlung bzw. sogar ein Heizen des Stranges bewirkt wird. In dem sich daran anschliessenden Abschnitt der Führungsstrecke ist eine Richttreibereinrichtung 7 mit Richtwalzenpaaren 7a bis 7h angeordnet. Zwischen diesen sind weitere schmale Tunnelelemente 8a bis 8g eingebaut. Der mittlerweile aussen versteifte Giessstrang 5 wird dort mit den Richtwalzenpaaren 7a bis 7h gerichtet und einem sich daran anschliessenden Reduzierwalzwerk 9 zugeführt.The guiding and straightening device 1 shown in Fig. 1 is part of a continuous casting plant for producing large-sized round profiles made of steel or a similar material. The molten steel is fed to a mold 2, at the Kokillenaustritt 3 a strand guide 4 is followed. The casting strand 5 emerging from the mold 2 is guided in the upper section of the guide path through elongate tunnel elements 6a to 6d, in which the casting strand 5 is insulated or heated as the case may be. These tunnel elements 6a to 6d can be completely closed or advantageously designed to be open at the bottom. The first three tunnel elements 6a to 6c can be designed, for example, such that a cooling of the strand running through them takes place, while in the case of a subsequent tunnel element 6d insulation without cooling or even heating of the strand is effected. In the adjoining section of the guide track, a straightening device 7 with straightening roller pairs 7a to 7h is arranged. Between these, further narrow tunnel elements 8a to 8g are installed. The now stiffened outside casting strand 5 is there addressed with the straightening roller pairs 7a to 7h and fed to a subsequent thereto Reduzierwalzwerk 9.
Die Tunnelelemente 8b, 8d und 8f sind mit Porenbrennern 10 ausgerüstet. Einer dieser Brenner ist schematisch in Figur 2 dargestellt. Die Tunnelelemente 8b, 8d und 8f weisen eine obere Deckenwand 11 auf, auf welcher der jeweilige Porenbrenner 10 aufgestellt ist. Vorzugsweise ist jeweils auch auf der unteren Seite dieser Tunnelelemente 8b, 8d und 8f eine nicht näher gezeigte Wand, die mit Vorteil mit Öffnungen oder dergleichen ist, vorgesehen, so dass diese Tunnelelemente besser isolieren.The tunnel elements 8b, 8d and 8f are equipped with pore burners 10. One of these burners is shown schematically in FIG. The tunnel elements 8b, 8d and 8f have an upper ceiling wall 11, on which the respective pore burner 10 is placed. Preferably, in each case also on the lower side of these tunnel elements 8b, 8d and 8f, a wall not shown in detail, which is advantageously provided with openings or the like, is provided, so that these tunnel elements insulate better.
Dieser Porenbrenner 10 besteht im wesentlichen aus einem Brenngas- und Luftzufuhranschluss 12 und einer sich daran anschliessenden Reaktorzelle 13, die mit einer Füllung 14 aus porösem Keramikschaum ausgefüllt ist. Dort läuft die Verbrennungsreaktion des vorgemischten Brenngas/Luft-Gemisches ab, mit dem Ergebnis einer flammenlosen volumetri- schen Verbrennung. Das aus der Reaktorzelle 13 ausströmende Abgas umströmt den Giesstrang 5 vollumfänglich und erhitzt den Strangmantel 15 vorteilhaft im oberen Bereich mehr als auf der unteren Seite, ohne in nennenswertem Mass den Strangkern 16 gleichzeitig aufzuheizen.This pore burner 10 consists essentially of a fuel gas and air supply port 12 and an adjoining reactor cell 13 which is filled with a filling 14 of porous ceramic foam. There the combustion reaction of the premixed fuel gas / air mixture takes place, with the result of a flameless volumetric combustion. The exhaust gas flowing out of the reactor cell 13 completely flows around the casting strand 5 and advantageously heats the strand jacket 15 more in the upper region than on the lower side, without heating up the strand core 16 to any appreciable extent.
Die Porenbrenner 10 ermöglichen eine sehr gut kontrollierbare und stabile Verbrennung des Energieträgers, einen sehr hohen Umwandlungsgrad der Energie in Strahlungsenergie, ein gleichmässig und grossflächig ausströmendes Abgas sowie einen sehr hohen Regelbereich der einge- brachten Heizenergie, so dass die Heizleistung der einzelnen Brenner gut den örtlich gegebenen Anforderungen anpassbar ist.The pore burners 10 allow a very well controllable and stable combustion of the energy carrier, a very high degree of conversion of the energy into radiant energy, a uniform and large outflow exhaust gas and a very high control range of the integrated brought heating energy, so that the heating power of the individual burners is well adapted to the locally given requirements.
Vor der Richttreibereinrichtung 7 ist ein zusätzlicher Porenbrenner 17 im länglichen Tunnelelement 6d der Strangführung angeordnet. Er ist genauso wie die Porenbrenner 10 der Richttreibereinrichtung 7 ausgebildet und hat ebenso wie diese die Funktion, den Strangmantel 15 aufzuheizen, um auch dort die Gefahr von Rissbildungen zu vermeiden. Da diese Gefahr mit dem Fortschreiten des Erstarrungsprozesses zunehmend wächst, ist es jedenfalls zweckmässig, die Porenbrenner 10 bzw. 17 im auslaufseitigen Bereich der Strangführung anzuordnen, in welcher der Strangmantel bereits in erheblichem Masse versteift ist. In diesem Sinne sind selbstverständlich innerhalb und ausserhalb der Richttreibereinrichtung andere Brenneranordnungen denkbar, jeweils in Anpassung an die jeweiligen Bedingungen.In front of the straightening device 7, an additional pore burner 17 is arranged in the elongated tunnel element 6d of the strand guide. He is just like the pore burner 10 of the straightening device 7 is formed and has as well as this the function of heating the strand shell 15, to avoid the risk of cracking there. Since this danger increases with the progress of the solidification process, it is expedient in any case to arrange the pore burners 10 or 17 in the outlet-side region of the strand guide, in which the strand casing is already stiffened to a considerable extent. In this sense, of course, other burner arrangements are conceivable inside and outside the straightening device, in each case in adaptation to the respective conditions.
Es ist ebenfalls im Rahmen der Erfindung möglich, die Brenner abweichend von der beschriebenen Ausführung zu gestalten, sofern sie dazu geeignet sind, die Ober- und Unterseite des Strangmantels umfänglich gleichmässig aufzuheizen. In dieser Hinsicht hat die beschriebene Ausführung den Vorteil, dass die aus dem Reaktor 13 ausströmenden hei- ssen Abgase direkt die am stärksten rissgefährdete Oberseite des Strangs aufheizen, während die weniger rissgefährdete Unterseite erst nachfolgend durch nicht ganz so heisse Abgase aufgeheizt wird.It is also possible within the scope of the invention to design the burner differently from the described embodiment, provided that they are suitable for uniformly heating the upper and lower sides of the strand casing circumferentially. In this respect, the embodiment described has the advantage that the hot exhaust gases flowing out of the reactor 13 directly heat the top of the strand, which is the most susceptible to cracking, while the lower side, which is less susceptible to cracking, is heated up by not so hot exhaust gases.
Die Steuerung der Brennerleistung erfolgt bei den einzelnen Brennern in Abhängigkeit von ihrer Lage in der Richtstrecke. Zu diesem Zweck sind entlang der Strangführung Temperatursensoren 18 vorgesehen.The control of the burner power takes place at the individual burners depending on their location in the guideline. For this purpose, temperature sensors 18 are provided along the strand guide.
Die beschriebene Anlage ist mit einer vom Kokillenaustritt 3 bis zum Austritt aus der Richttreibereinrichtung 7 durchgehend gebogenen Strangführung ausgerüstet. Die Erfindung ist aber selbstverständlich auch bei Anlagen anwendbar, deren Strangführung nach dem Kokillenaustritt zunächst senkrecht verläuft, um erst anschliessend in eine gebogene Führungsstrecke überzugehen.The plant described is equipped with a Kokillenaustritt 3 to the exit from the straightening device 7 continuously bent strand guide. However, the invention is of course also applicable to systems whose strand guide after the Kokillenaustritt initially runs vertically, only to then pass into a curved guide track.
Theoretisch könnte auch eine Aufheizung des Strangmantels nur auf seiner Oberseite erfolgen, damit zumindest diese beim Strecken des Stranges entstehenden Zugspannungen zu reduzieren. Theoretically, a heating of the strand jacket could be done only on its upper side, so as to reduce at least these resulting in stretching the strand tensile stresses.

Claims

PATENTANSPRÜCHE
1. Verfahren zum Führen und Richten des Strangs in einer Strang- giessanlage für grossformatige Rundprofile aus Stahl oder ähnlichen Werkstoffen, dadurch gekennzeichnet, dass der Strangmantel (15) innerhalb der Richtstrecke aufgeheizt wird.1. A method for guiding and straightening the strand in a continuous casting plant for large-sized round profiles made of steel or similar materials, characterized in that the strand jacket (15) is heated within the straightening.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der Strangmantel (15) vollumfänglich aufgeheizt wird.2. The method according to claim 1, characterized in that the strand casing (15) is heated to the full extent.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Heizleistung den im Strangmantel (15) entlang der Richtstrecke örtlich auftretenden Dehnungen angepasst wird. 3. The method according to claim 1 or 2, characterized in that the heating power is adapted in the strand casing (15) along the straightening line locally occurring strains.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Strangmantel (15) in mehreren vorzugsweise gleichmässig angeordneten Teilzonen (8b, 8d, 8f) der Richtstrecke aufgeheizt wird.4. The method according to any one of claims 1 to 3, characterized in that the strand casing (15) is heated in a plurality of preferably uniformly arranged sub-zones (8b, 8d, 8f) of the straightening path.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Strangmantel (15) durch Verbrennen eines Luft/Gas-Gemisches in einem porösen Gefüge (14) und Blasen der heissen Abgase auf den Strangmantel (15) aufgeheizt wird.5. The method according to any one of claims 1 to 4, characterized in that the strand jacket (15) by burning an air / gas mixture in a porous structure (14) and blowing the hot exhaust gases on the strand shell (15) is heated.
6. Einrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sie mindestens einen Porenbrenner (10, 17) mit einem mit Keramikschaum oder ähnlichen Strukturen gefüllten Reaktor (13) aufweist, dessen heissen Abgase den Strangmantel (15) zumindest auf seiner Oberseite beaufschlagen.6. Device for carrying out the method according to one of claims 1 to 5, characterized in that it comprises at least one pore burner (10, 17) with a ceramic foam or similar structures filled reactor (13), the hot exhaust gases, the strand shell (15) at least act on its top.
7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Austrittsöffnung der Reaktorzelle (13) auf die Oberseite des Strangmantels (15) gerichtet ist, so dass auf der Oberseite des Strangmantels eine grossere Erwärmung als auf dessen Unterseite erfolgt.7. Device according to claim 6, characterized in that the outlet opening of the reactor cell (13) is directed to the upper side of the strand jacket (15), so that on the upper side of the strand jacket a greater heating than on its underside takes place.
8. Einrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass sie eine im auslaufseitigen Strangführungsbereich befindliche Richttreibereinrichtung (7) mit mehreren vorzugsweise gleichmässig verteilt angeordneten Porenbrennern (10) aufweist, die in Zwischenräumen zwischen den Richtwalzenpaaren (7a bis 7h) der Richttreibereinrichtung (7) eingebaut sind. 8. Device according to claim 6 or 7, characterized in that it comprises a straightening device (7) located in the outlet side strand guide region with a plurality of preferably uniformly distributed porous burners (10), which are arranged in intermediate spaces between the straightening roller pairs (7a to 7h) of the straightening drive device (7 ) are installed.
9. Einrichtung nach Anspruch 8, dadurch gekennzeichnet, dass sie mit mindestens einem zusätzlich vor der Richttreibereinrichtung (7) angeordneten Porenbrenner (17) versehen ist.9. Device according to claim 8, characterized in that it is provided with at least one additionally in front of the straightening device (7) arranged pore burner (17).
10. Einrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass dem mindestens einen Porenbrenner (10, 17) jeweils ein den Strangmantel (15) zumindest teilweise umgebendes Tunnelelement (8b, 8d und 8f) zugeordnet ist, durch welches diese Abgase um den Strangmantel herum geleitet werden.10. Device according to one of claims 6 to 9, characterized in that the at least one pore burner (10, 17) in each case a strand jacket (15) at least partially surrounding tunnel element (8b, 8d and 8f) is assigned, by which these exhaust gases to to be routed around the strand jacket.
11. Einrichtung nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, dass der aus der Kokille (2) austretende Giesstrang (5) im oberen Abschnitt der Führungsstrecke durch vorzugsweise mehrere längliche Tunnelelemente (6a bis 6d) hindurchgeführt wird, in welchen der Giessstrang (5) je nachdem isoliert oder erwärmt wird. 11. Device according to one of claims 6 to 10, characterized in that from the mold (2) exiting casting strand (5) in the upper portion of the guide track is preferably passed through a plurality of elongated tunnel elements (6a to 6d), in which the Giessstrang ( 5) is insulated or heated as appropriate.
PCT/EP2010/003273 2009-06-03 2010-05-30 Method and device for guiding and orienting a strand in a continuous casting facility for large-sized round sections WO2010139438A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN2010800250384A CN102481624A (en) 2009-06-03 2010-05-30 Method and device for guiding and orienting billets in a continuous casting installation for large-size round profiles
US13/266,210 US20120037331A1 (en) 2009-06-03 2010-05-30 Method and Device for Guiding and Orienting a Strand in a Continuous Casting Facility for Large-Sized Round Profiles
RU2011153214/02A RU2011153214A (en) 2009-06-03 2010-05-30 METHOD AND DEVICE FOR DIRECTION AND RECTIFICATION OF PROCESSING IN INSTALLATION OF CONTINUOUS CASTING FOR ROUND PROFILES OF LARGE FORMAT
JP2012513501A JP5608224B2 (en) 2009-06-03 2010-05-30 Method and apparatus for heating steel slabs in a continuous casting facility for circular molds
CA2760254A CA2760254A1 (en) 2009-06-03 2010-05-30 Method and device for guiding and orienting a strand in a continuous casting facility for large-sized round profiles
MX2011012527A MX2011012527A (en) 2009-06-03 2010-05-30 Method and device for guiding and orienting a strand in a continuous casting facility for large-sized round sections.

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EP20090405092 EP2263816A1 (en) 2009-06-03 2009-06-03 Method and apparatus for guiding and straightening a strand in a continuous acsting machine for round billets of large cross-section
EP09405092.9 2009-06-03

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CN106475539A (en) * 2015-08-31 2017-03-08 鞍钢股份有限公司 Device and method for reducing corner cracks of casting blank
CN112059129A (en) * 2020-07-15 2020-12-11 金龙精密铜管集团股份有限公司 Production method of low-alloy-content copper pipe

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