EP3600721B1 - Installation and method for the semi-continuous casting of slabs - Google Patents

Installation and method for the semi-continuous casting of slabs Download PDF

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Publication number
EP3600721B1
EP3600721B1 EP18720106.6A EP18720106A EP3600721B1 EP 3600721 B1 EP3600721 B1 EP 3600721B1 EP 18720106 A EP18720106 A EP 18720106A EP 3600721 B1 EP3600721 B1 EP 3600721B1
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Prior art keywords
strand
slab
caster
mould
pivotable
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EP18720106.6A
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German (de)
French (fr)
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EP3600721A1 (en
Inventor
Adolf Gustav Zajber
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Primetals Technologies Austria GmbH
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Primetals Technologies Austria GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • B22D11/141—Plants for continuous casting for vertical casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • B22D11/147—Multi-strand plants
    • 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
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields
    • 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
    • B22D11/1281—Vertical removing

Definitions

  • the present invention relates on the one hand to a plant for the semi-continuous continuous casting of billets with a single or multi-strand first casting plant for continuous casting of at least one first billet and a single or multi-strand second casting plant for continuous casting of at least one second billet.
  • the invention relates to a method for semi-continuous continuous casting of billets in a plant, comprising a single or multi-strand first casting plant for continuously casting at least one first billet and a single or multi-strand second casting plant for continuously casting at least one second billet.
  • WO 2016/131437 A2 a method and a system for producing steel strands is known.
  • the hot strand is guided vertically down from the mold by means of a cold strand into a support segment with strand support rollers and then brought into a downstream vertical strand guide area in which the hot strand is cooled.
  • the hot strand is grasped with the aid of a transport trolley and extended to the side.
  • a semi-continuous continuous caster for steel strands is known.
  • the steel strand is supported and guided by the mold in a secondary cooling system and then conveyed on to a tertiary cooling zone.
  • the cooled strand is conveyed laterally out of the tertiary cooling zone.
  • the cast strand can, for example, be placed on a pedestal, with the pedestal and the strand being able to be moved to a further tertiary cooling zone.
  • the tertiary cooling zone can have two brackets that support the strand laterally.
  • the strand can be swiveled out in relation to the vertical, with the strand resting on the bracket.
  • the strand can be placed on a roller table via a swivel drive, via which it can be removed.
  • the object of the present invention is to increase the safety of systems for the semi-continuous continuous casting of ingot strands and, in particular, to simplify the solidification and the subsequent conveying out of the ingot strands. Nevertheless, the system should have a high productivity.
  • the plant according to the invention has at least one single or multi-strand first casting plant for semi-continuous continuous casting of at least one first block strand and one single or multi-strand second casting plant for semi-continuous continuous casting of at least one second block strand.
  • the first casting system is an n-string system and the second casting system is an m-string system, with n ⁇ 1,2,3 ... and m ⁇ 1,2,3 .... So, for example
  • the first casting plant can be a two-strand system and the second casting system can be a single-strand system.
  • the molds of these casting systems are supplied with molten steel by a movable ladle or a movable tundish.
  • the casting systems are supplied with molten steel through a movable distribution channel.
  • the casting speed of each casting system can be controlled or regulated separately, e.g. by means of a slide valve or a stopper.
  • a round block strand with a first diameter is cast on the first strand of the first casting plant
  • a round block strand with a second diameter is cast on the second strand of the first casting plant
  • a rectangular block strand is cast on the single strand of the second casting plant.
  • Each strand of the two casting plants has at least one mold with an oscillator, a first segment, a swiveling strand guide, insulating flaps and a cold strand pull-out system.
  • a partially solid block strand is formed from the molten steel.
  • the adherence of the strand shell of the Block strand to the mold is prevented by an oscillator.
  • the mold is followed in the casting direction by a first segment for supporting and guiding the partially solidified billet.
  • the block strand which has a thin strand shell, is supported and guided by strand guiding devices (for example strand guiding rollers) and preferably further cooled by spray nozzles of a secondary cooling system.
  • the pivotable strand guide has a strand guide frame and one or preferably more strand guide sections, wherein a strand guide section has at least one strand guide device for supporting and guiding the partially or completely solidified block strand and the pivotable strand guide for conveying the block strand out of the casting plant can be pivoted about an axis of rotation.
  • the swiveling strand guide into the casting plant only to convey out the "self-supporting" block strand.
  • the block strand is supported on the cold strand or on the cold strand pull-out system.
  • the cooling of the block strand can be controlled or regulated by means of insulating flaps, which are arranged either on the swiveling strand guide, e.g. the strand guide frame, or the stationary system support frame (mostly technological steel frame or STAKO for short).
  • the cold strand pull-out system is used to pull the cold strand and the subsequent hot strand out of the mold and to support the ingot.
  • the strand is supported by the cold strand or the cold strand extraction system until it has completely solidified and is only then conveyed out. This means that the system can be operated much more safely. Due to the flexible configuration of the n-strand first casting plant and the m-strand second casting plant, the production output can easily be increased if necessary, for example by increasing the number of strands in the first or second casting plant.
  • the pivotable strand guide has a horizontal axis of rotation for tilting and conveying the block strand essentially transversely to the casting direction.
  • the block strand can be conveyed out, for example, by tilting the strand guide frontally or to the side by 90 °.
  • the pivotable strand guide can have a vertical axis of rotation for pivoting out and conveying out the block strand in the casting direction.
  • Block strands that are very variable in size can be held particularly securely if one strand guide roller can be adjusted to the block strand by a linear movement and two further strand guide rollers by pivoting two guide levers.
  • a drive can pivot the insulating flaps about a vertical axis of rotation and, in the closed position, the insulating flaps enclose the string of blocks, preferably completely or essentially completely.
  • molten steel is poured into the mold through a movable tundish or pouring ladle.
  • the movable tundish can sequentially supply the first and second casting systems with molten steel. This feature dramatically lowers costs because the cost of delivering the single mailing list is significantly lower.
  • a billet billet is stirred electromagnetically in the mold and / or during the thermal insulation of the billet billet.
  • a strand agitator is moved into the area of the opened insulating flaps and the strand agitator then electromagnetically stirs the block strand.
  • the strand stirrer is moved out of the area of the open insulating flaps and then afterwards the insulating flaps are closed again or at least partially closed again.
  • the block strand end is at least partially heated by a so-called "hot topping" treatment during the thermal insulation of the block strand.
  • a powder e.g. an exothermic powder
  • the end of the block strand is thermally insulated by the powder and, optionally, by a cap enveloping the strand head. After the block strand has solidified, the cap can be removed again and, if necessary, reused. If necessary, the end of the block strand can also be removed, e.g. outside the system.
  • the Fig 1 shows the simplest form of a system according to the invention for the semi-continuous continuous casting of billets B1, B2 with a single-strand first casting plant GA1 for continuously casting at least one first billet B1 and a single-strand second casting plant GA2 for continuously casting at least one second billet B2.
  • the molds 3 of both casting systems are supplied with molten steel via a casting ladle 1 and a movable tundish 2.
  • the strands of both casting plants GA1, GA2 are essentially constructed identically.
  • a partially solidified block strand B1, B2 with a thin strand shell is formed in the mold 3.
  • the adherence of the strand shell of the respective block strand B1, B2 to the copper plates of the mold 3 is prevented by an oscillator 4.
  • the Partially solidified block strand B1, B2 is pulled out by the cold strand pull-out system with the cold strand cross member 20, the drive 21 and the sprocket 22.
  • the block strand could also be pulled out by a hydraulic cylinder carrying the cold strand 19.
  • a first segment 5 with strand guide rollers 9 (see Fig 2 ) arranged to support and guide the respective block strand B1, B2.
  • the Fig 2 shows the section AA of the strand guide 6 which can be frontally tilted forwards (the tilting direction is shown by an arrow).
  • the block strand B2 is supported in a strand guide section 8 by three strand guide rollers 9.
  • the middle strand guide roller 9 is employed by a hydraulic cylinder 13; the two outer strand guide rollers 9 are each adjusted by a hydraulic cylinder 13 via guide levers 12.
  • spindle drives or the like could also be used.
  • the adjustable thermal insulation of the block strand B2 in a strand guide section 8 is carried out by two insulating flaps 11, which can be opened and closed by a drive. The insulating flaps 11 are not pivoted when the block strand B2 is conveyed out and remain on the system support frame 10.
  • Fig 1 the pivotable strand guide 6 with the strand guide frame 7 and several strand guide sections 8 is also shown.
  • the pivotable strand guide 6 has a horizontal axis of rotation DA and can be tilted by 90 ° by the hydraulic cylinder 13.
  • the block strand is then conveyed out transversely to the casting direction (see Fig 1 , Side elevation).
  • step a shown on the far left, the molds were 3 of the two Casting systems GA1, GA2 already sealed by a cold strand 19, for example in the casting direction by "top feeding” or counter to the casting direction by "bottom feeding”, and the tundish 2 or the casting ladle 1 is located above the first casting system GA1.
  • step b After the pouring of molten steel into the mold 3 of the first casting installation GA1 has started (step b), for example by lifting a plug in the tundish 2, a mold level forms in the mold.
  • step c the block strand B1 has reached its target length or its target weight and the pouring of molten steel was stopped.
  • the block strand B1 is still pulled out of the mold 3, at least until the upper end of the block strand B1 (also called the block strand end) has reached an upper end of the pivotable strand guide 6 (step e).
  • the partially solidified block strand B1 is then cooled in a controlled or regulated manner by insulating flaps 11 until it has completely solidified and is then conveyed out by means of the pivotable strand guide 6.
  • the block strand B1 is supported on the cold strand 19.
  • the conveyance of the solidified first block strand B1 from the first casting plant GA1 - step f - is in the Fig 7 and 8th not explicitly shown, here, for example, the Fig 1 with the position of the pivotable strand guide 6 and the strand guide frame 7 shown in dashed lines, as well as on the Fig 2, 3 (direction of arrow) and Fig 5 referenced.
  • first block strand B1 is not necessarily conveyed out of the first casting installation GA1 before the casting operation of the second casting installation GA2 is started.
  • the second casting plant GA2 takes place in Fig 7 no casting operation has yet taken place.
  • Fig 8 the casting ladle 1 or the tundish 2 was moved to the second casting installation GA2 in the direction of the arrow and is located above the mold 3 of the second casting installation GA2 (step g). It is immaterial here when the mold 3 was actually sealed. It is only essential that the mold is closed as soon as molten steel is poured in.
  • step h analogous to step b, molten steel is poured into the mold 3 of the second casting plant, then the second strand B2 is pulled out of the mold 3 of the second casting plant GA2, supported and guided in the first segment 5 and, if necessary, further cooled, the pouring of molten steel stopped (step i), the pulling out of the second block strand B2 stopped (step k) and then the second block strand B2 is thermally insulated by insulating flaps 11 until complete solidification.
  • the second block strand is conveyed out again by means of the pivotable strand guide 6.
  • the first casting installation GA1 as in FIG Fig 7 and 8th is single-stranded or, for example, two-stranded.
  • two molds would be supplied with melt through a longer distributor channel 2, so that, for example, two first ingot strands B1 are formed in parallel.
  • the Fig 3 shows the pivotable strand guide 6 of a two-strand casting plant with insulating flaps 11.
  • the first and the second block strand B1, B2 can each be pivoted out to the side, the arrows indicating the pivoting direction.
  • the system can be built very compact and, in particular, a short strand spacing 14 can be maintained.
  • the Fig 4 shows one to Fig 3 alternative arrangement of the strand guides 6, the strand spacing 14 between the first and second block strand B1, B2 is much larger than in Fig 3 .
  • the cold strand traverses 20 of the first and second casting systems GA1, GA2 are arranged collinearly, so that a larger strand spacing 14 results.
  • the block strands B1, B2 can each be swiveled forward; the insulating flaps 11 are each connected to the pivotable strand guide 6 of the first and second casting plants GA1, GA2.
  • strand guide 6 is shown with further details.
  • the circular block strand B1 shown in the left view with two different diameters is supported on the circumference by three strand guide rollers 9, one strand guide roller 9 being held by a linearly movable hydraulic cylinder 13 and two further strand guide rollers 9 each by a pivotable guide lever 12.
  • the insulating flaps 11 are pivoted in and out by a drive 23.
  • the Fig 5 shows the conveyance of a block strand B1 from the first casting plant GA1 by means of a pivotable strand guide 6.
  • the strand guide frame 7 of the pivotable strand guide 6 has a vertical axis of rotation DA, so that the block strand B1 with the strand guide rollers 9 holding it can be pivoted out.
  • the block strand B1 can either be taken directly from the pivotable strand guide 6 by a crane, the strand guide rollers 9 released and the block strand B1 transported away, or the block strand B1 is lowered by a further manipulator 18 and then conveyed out.
  • a side elevation of a system according to the invention is shown.
  • the cold strand 19 and the cold strand traverse 20 are driven via two drives 21 and associated spindles.
  • the distribution channel 2 with two plugs can supply a two-strand first casting plant GA1 and a single-strand second casting plant GA2.
  • the pivotable strand guide 6 with the strand guide frame 7 is pivoted via a hydraulic cylinder 13 (see arrow for the pivoting direction);
  • the strand guide frame 7 can be moved linearly in the swiveled-out state, so that the block strand B1 can easily be removed.

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

Description

Gebiet der TechnikField of technology

Die vorliegende Erfindung betrifft einerseits eine Anlage zum semi-kontinuierlichen Stranggießen von Blocksträngen mit einer ein- oder mehrsträngigen ersten Gießanlage zum Stranggießen mindestens eines ersten Blockstrangs und einer ein- oder mehrsträngigen zweiten Gießanlage zum Stranggießen mindestens eines zweiten Blockstrangs.The present invention relates on the one hand to a plant for the semi-continuous continuous casting of billets with a single or multi-strand first casting plant for continuous casting of at least one first billet and a single or multi-strand second casting plant for continuous casting of at least one second billet.

Andererseits betrifft die Erfindung ein Verfahren zum semi-kontinuierlichen Stranggießen von Blocksträngen in einer Anlage, umfassend eine ein- oder mehrsträngige erste Gießanlage zum Stranggießen mindestens eines ersten Blockstrangs und eine ein- oder mehrsträngige zweite Gießanlage zum Stranggießen mindestens eines zweiten Blockstrangs.On the other hand, the invention relates to a method for semi-continuous continuous casting of billets in a plant, comprising a single or multi-strand first casting plant for continuously casting at least one first billet and a single or multi-strand second casting plant for continuously casting at least one second billet.

Stand der TechnikState of the art

Aus der Veröffentlichung
A. G. Zajber "Diskontinuierliches Stranggießen als Alternative für Spezialstähle", stahl und eisen 136 (2016), Nr. 10, Seiten 62-65
ist eine Anlage zum semi-kontinuierlichen Stranggießen von Blocksträngen bekannt. Gemäß der Figur 4 können nicht durcherstarrte Blockstränge mittels Wägen aus der Gießanlage in eine Strangerstarrungsposition ausgefahren und nach der Durcherstarrung von dort entnommen werden.From the publication
AG Zajber "Discontinuous continuous casting as an alternative for special steels", stahl und eisen 136 (2016), No. 10, pages 62-65
a plant for the semi-continuous continuous casting of ingot strands is known. According to the Figure 4 Block strands that have not fully solidified can be moved out of the casting plant into a strand solidification position by means of weighing and removed from there after solidification.

Nachteilig daran ist, dass das Verfahren von nicht durcherstarrten Blocksträngen aufgrund des flüssigen Blockstrandendes sehr aufmerksam und sorgfältig durchgeführt werden und die Tertiärkühlzone zur Enderstarrung verfahrbar ausgebildet sein muss. Um die Sicherheit der Bedienmannschaft sicherzustellen, muss daher die Anlage relativ komplex aufgebaut sein.The disadvantage of this is that the process of block strands that have not completely solidified can be carried out very carefully and carefully due to the liquid end of the block strand, and the tertiary cooling zone can be moved for final solidification must be trained. In order to ensure the safety of the operating team, the system must therefore have a relatively complex structure.

Aus WO 2016/131437 A2 ist ein Verfahren und eine Anlage zum Erzeugen von Stahlsträngen bekannt. Dabei wird der Warmstrang mittels eines Kaltstrangs aus der Kokille vertikal nach unten in ein Stützsegment mit Strangstützrollen geführt und dann in einen nachgelagerten vertikalen Strangführungsbereich verbracht, in dem der Warmstrang gekühlt wird. Zum Ausbringen des Warmstrangs aus dem Strangführungsbereich wird der Warmstrang mithilfe eines Transportwagens erfasst und seitlich ausgefahren.Out WO 2016/131437 A2 a method and a system for producing steel strands is known. The hot strand is guided vertically down from the mold by means of a cold strand into a support segment with strand support rollers and then brought into a downstream vertical strand guide area in which the hot strand is cooled. To bring the hot strand out of the strand guiding area, the hot strand is grasped with the aid of a transport trolley and extended to the side.

Aus WO 2015/079071 A2 ist eine semi-kontinuierliche Stranggießanlage für Stahlstränge bekannt. Auch bei dieser Anlage wird der Stahlstrang von der Kokille in einer Sekundärkühlung gestützt und geführt und anschließend in eine Tertiärkühlzone weiterbefördert. Der abgekühlte Strang wird seitlich aus der Tertiärkühlzone herausbefördert. Der gegossene Strang kann zum Beispiel auf einem Podest abgestellt werden, wobei das Podest samt dem Strang zu einer weiteren Tertiärkühlzone verfahren werden kann. Die Tertiärkühlzone kann zwei Bügel aufweisen, die den Strang seitlich stützen. Der Strang kann gegenüber der Vertikalen ausgeschwenkt werden, wobei der Strang an den Bügeln aufliegt. Der Strang kann über einen Schwenkantrieb auf einen Rollgang abgelegt werden, über den er entnommen werden kann.Out WO 2015/079071 A2 a semi-continuous continuous caster for steel strands is known. In this system, too, the steel strand is supported and guided by the mold in a secondary cooling system and then conveyed on to a tertiary cooling zone. The cooled strand is conveyed laterally out of the tertiary cooling zone. The cast strand can, for example, be placed on a pedestal, with the pedestal and the strand being able to be moved to a further tertiary cooling zone. The tertiary cooling zone can have two brackets that support the strand laterally. The strand can be swiveled out in relation to the vertical, with the strand resting on the bracket. The strand can be placed on a roller table via a swivel drive, via which it can be removed.

Zusammenfassung der ErfindungSummary of the invention

Die Aufgabe der vorliegenden Erfindung besteht darin, die Sicherheit von Anlagen zum semi-kontinuierlichen Stranggießen von Blocksträngen zu erhöhen und insbesondere die Durcherstarrung und das nachfolgende Ausfördern der Blockstränge zu vereinfachen. Dennoch soll die Anlage eine hohe Produktivität aufweisen.The object of the present invention is to increase the safety of systems for the semi-continuous continuous casting of ingot strands and, in particular, to simplify the solidification and the subsequent conveying out of the ingot strands. Nevertheless, the system should have a high productivity.

Diese Aufgabe wird durch eine Anlage zum semi-kontinuierlichen Stranggießen von Blocksträngen mit einer ein- oder mehrsträngigen ersten Gießanlage zum Stranggießen mindestens eines ersten Blockstrangs und einer ein- oder mehrsträngigen zweiten Gießanlage zum Stranggießen mindestens eines zweiten Blockstrangs nach Anspruch 1 gelöst, wobei jeder Strang der ersten und der zweiten Gießanlage in Gießrichtung folgende Baugruppen umfasst:

  • eine Kokille mit einem Oszillierer zum Oszillieren der Kokille, wobei sich in der Kokille ein teilerstarrter Blockstrang ausbildet;
  • ein erstes Segment zum Stützen und Führen des teilerstarrten Blockstrangs;
  • eine schwenkbare Strangführung mit einem Strangführungsrahmen und zumindest einer Strangführungssektion, wobei die Strangführungssektion zumindest eine Strangführungseinrichtung, bevorzugt drei Strangführungsrollen, zum Stützen und Führen des Blockstrangs aufweist, und die schwenkbare Strangführung zum Ausfördern des Blockstrangs um eine Drehachse schwenkbar ist;
  • Isolierklappen zur einstellbaren Wärmeisolation des Blockstrangs, wobei die Isolierklappen entweder auf der schwenkbaren Strangführung oder einem stationären Anlagentraggerüst angeordnet sind; und
  • ein Kaltstrangauszugssystem zum Ausziehen eines Kaltstrangs und des nachfolgenden Blockstrangs aus der Kokille und zum Abstützen des Blockstrangs.
This object is achieved by a system for the semi-continuous continuous casting of billet strands with a single or multi-strand first casting plant for continuously casting at least one first billet and a single or multi-strand second casting plant for continuously casting at least one second billet according to claim 1, each strand of the The first and the second casting system in the casting direction comprises the following assemblies:
  • a mold with an oscillator for oscillating the mold, a partially solidified block strand being formed in the mold;
  • a first segment for supporting and guiding the partially solidified billet strand;
  • a pivotable strand guide with a strand guide frame and at least one strand guide section, wherein the strand guide section has at least one strand guide device, preferably three strand guide rollers, for supporting and guiding the block strand, and the pivotable strand guide for conveying the block strand is pivotable about an axis of rotation;
  • Insulating flaps for adjustable thermal insulation of the block strand, the insulating flaps being arranged either on the pivotable strand guide or on a stationary system support frame; and
  • a cold strand pull-out system for pulling out a cold strand and the subsequent ingot from the mold and for supporting the ingot.

Die erfindungsgemäße Anlage weist zumindest eine ein- oder mehrsträngige erste Gießanlage zum semi-kontinuierlichen Stranggießen mindestens eines ersten Blockstrangs und eine ein- oder mehrsträngige zweite Gießanlage zum semi-kontinuierlichen Stranggießen mindestens eines zweiten Blockstrangs auf. Mit anderen Worten ist die erste Gießanlage eine n-strängige Anlage und die zweite Gießanlage eine m-strängige Anlage, mit n ∈ 1,2,3 ... und m ∈ 1,2,3 .... So kann bspw. die erste Gießanlage eine zweisträngige Anlage und die zweite Gießanlage eine einsträngige Anlage sein.The plant according to the invention has at least one single or multi-strand first casting plant for semi-continuous continuous casting of at least one first block strand and one single or multi-strand second casting plant for semi-continuous continuous casting of at least one second block strand. In other words, the first casting system is an n-string system and the second casting system is an m-string system, with n ∈ 1,2,3 ... and m ∈ 1,2,3 .... So, for example The first casting plant can be a two-strand system and the second casting system can be a single-strand system.

Handelt es sich bei der ersten und der zweiten Gießanlage um einsträngige Anlagen, so werden die Kokillen dieser Gießanlagen durch eine verfahrbare Gießpfanne oder eine verfahrbare Verteilerrinne mit Stahlschmelze versorgt. Ist jedoch eine der Gießanlagen mehrsträngig, ist bevorzugt, dass die Gießanlagen durch eine verfahrbare Verteilerrinne mit Stahlschmelze versorgt werden. In diesem Fall kann die Gießgeschwindigkeit jeder Gießanlage separat, z.B. durch einen Schieberverschluss oder einen Stopfen, gesteuert bzw. geregelt werden. Demnach ist es möglich, dass auf dem ersten Strang der ersten Gießanlage ein runder Blockstrang mit einem ersten Durchmesser, auf dem zweiten Strang der ersten Gießanlage ein runder Blockstrang mit einem zweiten Durchmesser und auf dem einzigen Strang der zweiten Gießanlage ein rechteckiger Blockstrang gegossen wird.If the first and second casting systems are single-strand systems, the molds of these casting systems are supplied with molten steel by a movable ladle or a movable tundish. However, if one of the casting systems has multiple strands, it is preferred that the casting systems are supplied with molten steel through a movable distribution channel. In this case, the casting speed of each casting system can be controlled or regulated separately, e.g. by means of a slide valve or a stopper. Accordingly, it is possible that a round block strand with a first diameter is cast on the first strand of the first casting plant, a round block strand with a second diameter is cast on the second strand of the first casting plant and a rectangular block strand is cast on the single strand of the second casting plant.

Jeder Strang der beiden Gießanlagen weist zumindest eine Kokille mit einem Oszillierer, ein erstes Segment, eine schwenkbare Strangführung, Isolierklappen und ein Kaltstrangauszugsystem auf. In der Kokille, typischerweise eine gekühlte Platten- oder Rohrkokille aus Kupferwerkstoff, bildet sich aus der Stahlschmelze ein teilerstarrter Blockstrang aus. Das Anhaften der Strangschale des Blockstrangs an die Kokille wird durch einen Oszillierer verhindert. Der Kokille folgt in Gießrichtung ein erstes Segment zum Stützen und Führen des teilerstarrten Blockstrangs nach. Dabei wird der eine dünne Strangschale aufweisende Blockstrang durch Strangführungseinrichtungen (z.B. Strangführungsrollen), gestützt und geführt und bevorzugt durch Spritzdüsen einer Sekundärkühlung weiter abgekühlt. Anstelle oder zusätzlich zu den Spritzdüsen kann ein freier Bereich zwischen dem ersten Segment und der schwenkbaren Strangführung vorgesehen sein, sodass der Blockstrang durch Strahlung bzw. Konvektion weiter abkühlt. Durch die schwenkbare Strangführung kann der Blockstrang gestützt und geführt und aus der Gießanlage ausgefördert werden. Hierzu weist die schwenkbare Strangführung einen Strangführungsrahmen und eine oder bevorzugt mehrere Strangführungssektionen auf, wobei eine Strangführungssektion zumindest eine Strangführungseinrichtung zum Stützen und Führen des teil- oder durcherstarrten Blockstrangs aufweist und die schwenkbare Strangführung zum Ausfördern des Blockstrangs aus der Gießanlage um eine Drehachse schwenkbar ist. Insbesondere bei runden oder polygonalen Strängen mit abgerundeten Kanten ist es möglich, die schwenkbare Strangführung nur zum Ausfördern des "selbstragenden" Blockstrangs in die Gießanlage einzufahren. Während des Stranggießens und Wärmeisolierens stützt sich der Blockstrang auf dem Kaltstrang bzw. auf dem Kaltstrangauszugsystem ab. Durch Isolierklappen, die entweder auf der schwenkbaren Strangführung, z.B. dem Strangführungsrahmen, oder dem stationären Anlagentraggerüst (meist technologisches Stahlgerüst oder kurz STAKO genannt), angeordnet sind, kann die Abkühlung des Blockstrangs gesteuert oder geregelt werden. Das Kaltstrangauszugsystem dient zum Ausziehen des Kaltstrangs und des nachfolgenden Warmstrangs aus der Kokille und zum Abstützen des Blockstrangs.Each strand of the two casting plants has at least one mold with an oscillator, a first segment, a swiveling strand guide, insulating flaps and a cold strand pull-out system. In the mold, typically a cooled plate or pipe mold made of copper material, a partially solid block strand is formed from the molten steel. The adherence of the strand shell of the Block strand to the mold is prevented by an oscillator. The mold is followed in the casting direction by a first segment for supporting and guiding the partially solidified billet. The block strand, which has a thin strand shell, is supported and guided by strand guiding devices (for example strand guiding rollers) and preferably further cooled by spray nozzles of a secondary cooling system. Instead of or in addition to the spray nozzles, a free area can be provided between the first segment and the pivotable strand guide so that the block strand cools down further through radiation or convection. Due to the swiveling strand guide, the ingot strand can be supported and guided and conveyed out of the casting plant. For this purpose, the pivotable strand guide has a strand guide frame and one or preferably more strand guide sections, wherein a strand guide section has at least one strand guide device for supporting and guiding the partially or completely solidified block strand and the pivotable strand guide for conveying the block strand out of the casting plant can be pivoted about an axis of rotation. Particularly in the case of round or polygonal strands with rounded edges, it is possible to move the swiveling strand guide into the casting plant only to convey out the "self-supporting" block strand. During the continuous casting and thermal insulation, the block strand is supported on the cold strand or on the cold strand pull-out system. The cooling of the block strand can be controlled or regulated by means of insulating flaps, which are arranged either on the swiveling strand guide, e.g. the strand guide frame, or the stationary system support frame (mostly technological steel frame or STAKO for short). The cold strand pull-out system is used to pull the cold strand and the subsequent hot strand out of the mold and to support the ingot.

In der erfindungsgemäßen Anlage wird der Strang bis zur vollständigen Durcherstarrung durch den Kaltstrang bzw. das Kaltstrangauszugsystem gestützt und erst dann ausgefördert. Dadurch kann die Anlage wesentlich sicherer betrieben werden. Durch die flexible Konfiguration der n-strängigen ersten Gießanlage und der m-strängigen zweiten Gießanlage kann die Produktionsleistung bei Bedarf einfach erhöht werden, z.B. durch eine Erhöhung der Strangzahl bei der ersten oder zweiten Gießanlage.In the system according to the invention, the strand is supported by the cold strand or the cold strand extraction system until it has completely solidified and is only then conveyed out. This means that the system can be operated much more safely. Due to the flexible configuration of the n-strand first casting plant and the m-strand second casting plant, the production output can easily be increased if necessary, for example by increasing the number of strands in the first or second casting plant.

Bei einer bevorzugten Ausführungsform weist die schwenkbare Strangführung eine horizontale Drehachse zum Kippen und Ausfördern des Blockstrangs im Wesentlichen quer zur Gießrichtung auf. Dadurch kann der Blockstrang bspw. durch frontales oder seitliches Kippen der Strangführung um 90° ausgefördert werden.In a preferred embodiment, the pivotable strand guide has a horizontal axis of rotation for tilting and conveying the block strand essentially transversely to the casting direction. As a result, the block strand can be conveyed out, for example, by tilting the strand guide frontally or to the side by 90 °.

Alternativ dazu kann die schwenkbare Strangführung eine vertikale Drehachse zum Aussschwenken und Ausfördern des Blockstrangs in Gießrichtung aufweisen.Alternatively, the pivotable strand guide can have a vertical axis of rotation for pivoting out and conveying out the block strand in the casting direction.

Insbesondere bei großformatigen Blocksträngen mit einer Querschnittsabmessung > 500 mm ist es vorteilhaft, wenn die schwenkbare Strangführung nur Losseiten aufweist, sodass der Mittelpunkt des Blockstrangs bei einem Formatwechsel konstant bleibt. Dies hat u.a. den Vorteil, dass sich unterschiedlich große Blockstränge stets zentrisch am Kaltstrang abstützen.In particular in the case of large-format block strands with a cross-sectional dimension> 500 mm, it is advantageous if the pivotable strand guide only has loose sides so that the center of the block strand remains constant when the format is changed. This has the advantage, among other things, that billet strands of different sizes are always supported centrally on the cold strand.

Stark größenvariable Blockstränge können besonders sicher gehalten werden, wenn eine Strangführungsrolle durch lineares Verfahren und zwei weitere Strangführungsrollen durch Verschwenken von zwei Führungshebeln an den Blockstrang anstellbar sind.Block strands that are very variable in size can be held particularly securely if one strand guide roller can be adjusted to the block strand by a linear movement and two further strand guide rollers by pivoting two guide levers.

Außerdem ist es vorteilhaft, wenn ein Antrieb die Isolierklappen um eine vertikale Drehachse verschwenken kann und die Isolierklappen in der geschlossenen Stellung den Blockstrang, vorzugsweise vollständig oder im Wesentlichen vollständig, umschließen.In addition, it is advantageous if a drive can pivot the insulating flaps about a vertical axis of rotation and, in the closed position, the insulating flaps enclose the string of blocks, preferably completely or essentially completely.

Weiters ist es günstig, wenn die Bewegung von zwei radial gegenüberliegenden Isolierklappen durch ein Synchronisierungsmittel, z.B. ein Zahnrad, synchronisiert wird.It is also advantageous if the movement of two radially opposite insulating flaps is synchronized by a synchronization means, for example a gear.

Die erfindungsgemäße Aufgabe wird ebenfalls durch ein Verfahren zum semi-kontinuierlichen Stranggießen von Blocksträngen in einer Anlage umfassend eine ein- oder mehrsträngige erste Gießanlage zum Stranggießen mindestens eines ersten Blockstrangs und eine ein- oder mehrsträngige zweite Gießanlage zum Stranggießen mindestens eines zweiten Blockstrangs nach Anspruch 9 gelöst, aufweisend die Schritte:

  • Verschließen einer Kokille der ersten Gießanlage, sodass ein Kaltstrang die Kokille fluiddicht verschließt;
  • Eingießen von Stahlschmelze aus einer Verteilerrinne oder einer Gießpfanne in die Kokille, wodurch sich in der Kokille ein teilerstarrter erster Blockstrang ausbildet;
  • Ausziehen des ersten Blockstrangs aus der Kokille mittels eines Kaltstrangauszugsystems, wobei der erste Blockstrang zumindest in einem ersten Segment der ersten Gießanlage gestützt und geführt wird;
  • Stoppen des Eingießens von Stahlschmelze in die Kokille, wodurch sich ein Blockstrangende ausbildet;
  • Stoppen des Ausziehens frühestens nachdem das Blockstrangende ein oberes Ende einer um eine Drehachse schwenkbaren Strangführung der ersten Gießanlage erreicht hat;
  • Wärmeisolieren bis zur vollständigen Durcherstarrung des ersten Blockstrangs durch Isolierklappen;
  • Ausfördern des durcherstarrten ersten Blockstrangs aus der ersten Gießanlage durch die schwenkbare Strangführung;
  • Verschließen einer Kokille der zweiten Gießanlage, sodass ein Kaltstrang die Kokille fluiddicht verschließt;
  • Verfahren der Verteilerrinne oder der Gießpfanne zur zweiten Gießanlage;
  • Eingießen von Stahlschmelze in die Kokille der zweiten Gießanlage, wodurch sich in der Kokille ein teilerstarrter zweiter Blockstrang ausbildet;
  • Ausziehen des zweiten Blockstrangs aus der Kokille der zweiten Gießanlage mittels eines Kaltstrangauszugsystems, wobei der zweite Blockstrang zumindest in einem ersten Segment der zweiten Gießanlage gestützt und geführt wird;
  • Stoppen des Eingießens von Stahlschmelze in die Kokille der zweiten Gießanlage, wodurch sich ein Blockstrangende ausbildet;
  • Stoppen des Ausziehens frühestens nachdem das Blockstrangende ein oberes Ende einer um eine Drehachse schwenkbaren Strangführung der zweiten Gießanlage erreicht hat, wobei zumindest ein Schritt, bevorzugt zwei oder mehr als zwei Schritte, besonders bevorzugt alle Schritte, aus der Gruppe
  • Verfahren der Verteilerrinne oder der Gießpfanne,
  • Eingießen von Stahlschmelze in die Kokille der zweiten Gießanlage,
  • Ausziehen des zweiten Blockstrangs,
  • Stoppen des Eingießens, und
  • Stoppen des Ausziehens,
während des Wärmeisolierens des ersten Blockstrangs in der ersten Gießanlage durchgeführt werden,
  • Wärmeisolieren bis zur vollständigen Durcherstarrung des zweiten Blockstrangs durch Isolierklappen,
  • Ausfördern des durcherstarrten zweiten Blockstrangs aus der zweiten Gießanlage durch die schwenkbare Strangführung.
The object according to the invention is also achieved by a method for the semi-continuous continuous casting of billets in a plant comprising a single or multi-strand first casting plant for continuously casting at least one first billet and a single or multi-strand second casting plant for continuously casting at least one second billet , comprising the steps:
  • Closing a mold of the first casting installation so that a cold strand closes the mold in a fluid-tight manner;
  • Pouring molten steel from a tundish or a pouring ladle into the mold, as a result of which a partially solidified first block strand is formed in the mold;
  • Pulling the first billet out of the mold by means of a cold billet extraction system, the first billet being supported and guided at least in a first segment of the first casting plant;
  • Stopping the pouring of molten steel into the mold, whereby an ingot end is formed;
  • Stopping the pulling out at the earliest after the end of the block strand has reached an upper end of a strand guide of the first casting plant that is pivotable about an axis of rotation;
  • Thermal insulation until the first block strand has completely solidified by insulating flaps;
  • Conveying the solidified first block strand out of the first casting installation by the pivotable strand guide;
  • Closing a mold of the second casting plant so that a cold strand closes the mold in a fluid-tight manner;
  • Moving the tundish or the ladle to the second caster;
  • Pouring molten steel into the mold of the second casting plant, as a result of which a partially solidified second block strand is formed in the mold;
  • Extracting the second strand of blocks from the mold of the second casting installation by means of a cold strand extraction system, the second strand of blocks being supported and guided at least in a first segment of the second casting installation;
  • Stopping the pouring of molten steel into the mold of the second caster, whereby an ingot end is formed;
  • Stopping the pulling out at the earliest after the block strand end has reached an upper end of a strand guide pivotable about an axis of rotation of the second casting plant, at least one step, preferably two or more than two steps, particularly preferably all steps, from the group
  • Moving the tundish or ladle,
  • Pouring molten steel into the mold of the second casting plant,
  • Pulling out the second block strand,
  • Stop pouring, and
  • Stopping undressing,
be carried out during the thermal insulation of the first block strand in the first casting plant,
  • Thermal insulation until the second block strand is completely solidified by insulating flaps,
  • The solidified second block strand is conveyed out of the second casting plant by the swiveling strand guide.

Hierbei ist wesentlich, dass das Eingießen von Stahlschmelze in die Kokille durch eine verfahrbaren Verteilerrinne oder Gießpfanne erfolgt. Somit kann z.B. die verfahrbare Verteilerrinne sequentiell die erste und die zweite Gießanlage mit Stahlschmelze versorgen. Dieses Merkmal senkt die Kosten dramatisch, da die Kosten für die Zustellung des einzigen Verteilers deutlich niedriger sind.It is essential that molten steel is poured into the mold through a movable tundish or pouring ladle. Thus, for example, the movable tundish can sequentially supply the first and second casting systems with molten steel. This feature dramatically lowers costs because the cost of delivering the single mailing list is significantly lower.

Auch ein zweites Merkmal ist besonders wesentlich, dass nämlich zumindest ein Schritt, bevorzugt zwei oder mehr als zwei Schritte, besonders bevorzugt alle Schritte, aus der Gruppe

  • Verfahren der Verteilerrinne oder der Gießpfanne,
  • Eingießen von Stahlschmelze in die Kokille der zweiten Gießanlage,
  • Ausziehen des zweiten Blockstrangs,
  • Stoppen des Eingießens und
  • Stoppen des Ausziehens des zweiten Blockstrangs, während, d.h. zeitlich parallel, zum Wärmeisolieren des ersten Blockstrangs bis zur Durcherstarrung des Blockstrangs in der ersten Gießanlage durchgeführt werden. Dadurch kann trotz der relativ langen Zeit für das Wärmeisolieren der Blockstränge die Produktionsleistung hoch gehalten werden.
A second feature is also particularly essential, namely that at least one step, preferably two or more than two steps, particularly preferably all steps, from the group
  • Moving the tundish or ladle,
  • Pouring molten steel into the mold of the second casting plant,
  • Pulling out the second block strand,
  • Stop pouring and
  • Stopping the pulling out of the second strand of blocks while, that is to say at the same time as the thermal insulation of the first strand of blocks, is carried out until the strand of blocks solidifies in the first casting plant. As a result, the production output can be kept high despite the relatively long time for the thermal insulation of the block strands.

Da beim erfindungsgemäßen Verfahren stets nur durcherstarrte Blockstränge ausgefördert werden, kann die Anlage sehr sicher betrieben werden.Since with the method according to the invention only solidified block strands are always conveyed out, the system can be operated very safely.

Vorteilhaft ist es, wenn das Ausfördern durch ein Kippen der schwenkbaren Strangführung um eine horizontale Drehachse erfolgt und anschließend der Blockstrang im Wesentlichen quer zur Gießrichtung ausgefördert wird, oder wenn das Ausfördern durch ein Ausschwenken der schwenkbaren Strangführung um eine vertikale Drehachse erfolgt und anschließend der Blockstrang in Gießrichtung ausgefördert wird.It is advantageous if the conveyance takes place by tilting the pivotable strand guide about a horizontal axis of rotation and then the block strand is conveyed essentially transversely to the casting direction, or if the conveyance takes place by pivoting the pivotable strand guide around a vertical axis of rotation and then the block strand in Casting direction is conveyed out.

Für die Innenqualität der Blockstränge ist es vorteilhaft, wenn ein Blockstrang in der Kokille und/oder während des Wärmeisolierens des Blockstrangs elektromagnetisch gerührt wird.For the internal quality of the billet billets, it is advantageous if a billet billet is stirred electromagnetically in the mold and / or during the thermal insulation of the billet billet.

Um den Abstand zwischen dem Strangrührer und dem Blockstrang gering zu halten, ist es günstig, wenn die Isolierklappen geöffnet werden, ein Strangrührer in den Bereich der geöffneten Isolierklappen eingefahren wird und anschließend der Strangrührer den Blockstrang elektromagnetisch rührt.In order to keep the distance between the strand agitator and the block strand small, it is advantageous if the insulating flaps are opened, a strand agitator is moved into the area of the opened insulating flaps and the strand agitator then electromagnetically stirs the block strand.

Weiters ist es vorteilhaft, wenn nach dem elektromagnetischen Rühren des Blockstrangs der Strangrührer aus dem Bereich der geöffneten Isolierklappen ausgefahren wird und anschließend die Isolierklappen wieder geschlossen oder zumindest teilweise wieder geschlossen werden.Furthermore, it is advantageous if, after the electromagnetic stirring of the block strand, the strand stirrer is moved out of the area of the open insulating flaps and then afterwards the insulating flaps are closed again or at least partially closed again.

Durch beide Maßnahmen wird der Abstand zwischen dem Rührer und dem Blockstrang kurz gehalten, sodass der Wirkungsgrad des elektromagnetischen Rührens hoch ist.Both measures keep the distance between the stirrer and the block strand short, so that the efficiency of the electromagnetic stirring is high.

Um ein Blockstrangende eines Blockstrangs länger flüssig zu halten, ist es vorteilhaft, wenn das Blockstrangende zumindest teilweise während des Wärmeisolierens des Blockstrangs durch eine sog. "hot topping" Behandlung erwärmt wird. Dabei wird ein Pulver (z.B. ein exothermes Pulver) auf das Blockstrangende aufgebracht und hat den Effekt, dass sich Einschlüsse und Verunreinigungen am Blockstrangende ansammeln und der Rest des Blockstrangs eine höhere Reinheit aufweist. Durch das Pulver und optional durch eine den Strangkopf umhüllende Kappe wird das Blockstrangende thermisch isoliert. Nach der Durcherstarrung des Blockstrangs kann die Kappe wieder entfernt und ggf. wiederverwendet werden. Falls notwendig kann das Blockstrangende ebenfalls entfernt werden, z.B. außerhalb der Anlage.In order to keep the end of a block strand liquid longer, it is advantageous if the block strand end is at least partially heated by a so-called "hot topping" treatment during the thermal insulation of the block strand. A powder (e.g. an exothermic powder) is applied to the block strand end and has the effect that inclusions and impurities accumulate at the block strand end and the rest of the block strand has a higher purity. The end of the block strand is thermally insulated by the powder and, optionally, by a cap enveloping the strand head. After the block strand has solidified, the cap can be removed again and, if necessary, reused. If necessary, the end of the block strand can also be removed, e.g. outside the system.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der Beschreibung nicht einschränkender Ausführungsbeispiele. Die nachfolgenden schematisch dargestellten Figuren zeigen:

  • Fig 1 einen Aufriss und einen Seitenriss einer Anlage zum semi-kontinuierlichen Stranggießen von Blocksträngen mit einer einsträngigen ersten Gießanlage zum Stranggießen mindestens eines ersten Blockstrangs und einer einsträngigen zweiten Gießanlage zum Stranggießen mindestens eines zweiten Blockstrangs
  • Fig 2 den Schnitt A-A aus Fig 1 mit einer Strangführung und Isolierklappen zur frontalen Ausförderung durch Kippen
  • Fig 3 einen Grundriss einer Strangführung für zwei Blockstränge mit Isolierklappen zur seitlichen Ausförderung durch Kippen
  • Fig 4 einen Grundriss einer Strangführung für zwei Blockstränge mit Isolierklappen zur frontalen Ausförderung durch Kippen
  • Fig 5 einen Aufriss und einen Seitenriss einer einsträngigen Anlage zur Ausförderung durch Ausschwenken der Strangführung und zwei Schnittdarstellungen der Strangführung
  • Fig 6 einen Grundriss einer Strangführung für einen Blockstrang mit Isolierklappen und eine Schnittdarstellung
  • Fig 7 und 8 Verfahrensschritte bei der Durchführung des erfindungsgemäßen Verfahrens
  • Fig 9 eine Seitenansicht einer erfindungsgemäßen Anlage mit einer seitlich kippbaren Strangführung
Further advantages and features of the present invention emerge from the description of non-limiting exemplary embodiments. The following schematically represented figures show:
  • Fig 1 an elevation and a side elevation of a plant for semi-continuous continuous casting of billet strands with a single-strand first casting plant for continuously casting at least one first billet strand and a single-strand second casting plant for continuously casting at least one second billet strand
  • Fig 2 the section AA Fig 1 with a strand guide and insulating flaps for frontal discharge by tilting
  • Fig 3 a floor plan of a strand guide for two block strands with insulating flaps for lateral conveyance by tilting
  • Fig 4 a floor plan of a strand guide for two block strands with insulating flaps for frontal discharge by tilting
  • Fig 5 an elevation and a side elevation of a single-strand system for conveying out by pivoting the strand guide and two sectional views of the strand guide
  • Fig 6 a floor plan of a strand guide for a block strand with insulating flaps and a sectional view
  • Fig 7 and 8th Method steps in carrying out the method according to the invention
  • Fig 9 a side view of a system according to the invention with a laterally tiltable strand guide

Beschreibung der AusführungsformenDescription of the embodiments

Die Fig 1 zeigt die einfachste Form einer erfindungsgemäßen Anlage zum semi-kontinuierlichen Stranggießen von Blocksträngen B1, B2 mit einer einsträngigen ersten Gießanlage GA1 zum Stranggießen mindestens eines ersten Blockstrangs B1 und einer einsträngigen zweiten Gießanlage GA2 zum Stranggießen mindestens eines zweiten Blockstrangs B2. Die Kokillen 3 beider Gießanlagen werden über einen Gießpfanne 1 und eine verfahrbare Verteilerrinne 2 mit Stahlschmelze versorgt. Die Stränge beider Gießanlagen GA1, GA2 sind im Wesentlichen identisch aufgebaut. In der Kokille 3 bildet sich ein teilerstarrter Blockstrang B1, B2 mit einer dünnen Strangschale aus. Das Anhaften der Strangschale des jeweiligen Blockstrangs B1, B2 an den Kupferplatten der Kokille 3 wird durch einen Oszillierer 4 verhindert. Der teilerstarrte Blockstrang B1, B2 wird durch das Kaltstrangauszugsystem mit der Kaltstrangtraverse 20, dem Antrieb 21 und dem Kettenrad 22 ausgezogen. Selbstverständlich könnte der Blockstrang auch durch einen den Kaltstrang 19 tragenden Hydraulikzylinder ausgezogen werden. Unterhalb der Kokille 3 ist ein erstes Segment 5 mit Strangführungsrollen 9 (siehe Fig 2) zum Stützen und Führen des jeweiligen Blockstrangs B1, B2 angeordnet.The Fig 1 shows the simplest form of a system according to the invention for the semi-continuous continuous casting of billets B1, B2 with a single-strand first casting plant GA1 for continuously casting at least one first billet B1 and a single-strand second casting plant GA2 for continuously casting at least one second billet B2. The molds 3 of both casting systems are supplied with molten steel via a casting ladle 1 and a movable tundish 2. The strands of both casting plants GA1, GA2 are essentially constructed identically. A partially solidified block strand B1, B2 with a thin strand shell is formed in the mold 3. The adherence of the strand shell of the respective block strand B1, B2 to the copper plates of the mold 3 is prevented by an oscillator 4. The Partially solidified block strand B1, B2 is pulled out by the cold strand pull-out system with the cold strand cross member 20, the drive 21 and the sprocket 22. Of course, the block strand could also be pulled out by a hydraulic cylinder carrying the cold strand 19. Below the mold 3 is a first segment 5 with strand guide rollers 9 (see Fig 2 ) arranged to support and guide the respective block strand B1, B2.

Die Fig 2 zeigt den Schnitt A-A der nach vorne frontal kippbaren Strangführung 6 (die Kipprichtung ist durch einen Pfeil dargestellt). Der Blockstrang B2 wird in einer Strangführungssektion 8 durch drei Strangführungsrollen 9 gestützt. Die mittlere Strangführungsrolle 9 wird durch einen Hydraulikzylinder 13 angestellt; die beiden äußeren Strangführungsrollen 9 werden jeweils von einem Hydraulikzylinder 13 über Führungshebel 12 angestellt. Anstelle von Hydraulikzylindern 13 könnten aber auch Spindelantriebe o.ä. verwendet werden. Die einstellbare Wärmeisolierung des Blockstrangs B2 in einer Strangführungssektion 8 erfolgt durch zwei Isolierklappen 11, die durch einen Antrieb geöffnet und geschlossen werden können. Die Isolierklappen 11 werden beim Ausfördern des Blockstrangs B2 nicht mitgeschwenkt und verbleiben am Anlagentraggerüst 10.The Fig 2 shows the section AA of the strand guide 6 which can be frontally tilted forwards (the tilting direction is shown by an arrow). The block strand B2 is supported in a strand guide section 8 by three strand guide rollers 9. The middle strand guide roller 9 is employed by a hydraulic cylinder 13; the two outer strand guide rollers 9 are each adjusted by a hydraulic cylinder 13 via guide levers 12. Instead of hydraulic cylinders 13, spindle drives or the like could also be used. The adjustable thermal insulation of the block strand B2 in a strand guide section 8 is carried out by two insulating flaps 11, which can be opened and closed by a drive. The insulating flaps 11 are not pivoted when the block strand B2 is conveyed out and remain on the system support frame 10.

In Fig 1 ist außerdem die schwenkbare Strangführung 6 mit dem Strangführungsrahmen 7 und mehreren Strangführungssektionen 8 dargestellt. Die schwenkbare Strangführung 6 weist eine horizontale Drehachse DA auf und kann durch den Hydraulikzylinder 13 um 90° gekippt werden. Das Ausfördern des Blockstrangs erfolgt dann quer zur Gießrichtung (siehe Fig 1, Seitenriss).In Fig 1 the pivotable strand guide 6 with the strand guide frame 7 and several strand guide sections 8 is also shown. The pivotable strand guide 6 has a horizontal axis of rotation DA and can be tilted by 90 ° by the hydraulic cylinder 13. The block strand is then conveyed out transversely to the casting direction (see Fig 1 , Side elevation).

Der erfindungsgemäße Verfahrensablauf ist in den Fig 7 und 8 anhand einer einsträngigen ersten Gießanlage GA1 und einer einsträngigen zweiten Gießanlage GA2 dargestellt. Im ganz links gezeigten Schritt a wurden die Kokillen 3 der beiden Gießanlagen GA1, GA2 bereits durch einen Kaltstrang 19 abgedichtet, z.B. in Gießrichtung durch "top feeding" oder entgegen der Gießrichtung durch "bottom feeding", und die Verteilerrinne 2 bzw. die Gießpfanne 1 befindet sich oberhalb der ersten Gießanlage GA1. Nachdem das Eingießen von Stahlschmelze in die Kokille 3 der ersten Gießanlage GA1 gestartet wurde (Schritt b), bspw. durch das Anheben eines Stopfens in der Verteilerrinne 2, bildet sich in der Kokille ein Gießspiegel aus. Durch das Erstarren der Stahlschmelze an der Kokille 3 bildet sich ein durcherstarrter Blockstranganfang und ein teilerstarrter erster Blockstrang B1 aus. Der erste Blockstrang B1 wird anschließend durch ein Kaltstrangauszugsystem 20, 21, 22 aus der Kokille 3 ausgezogen und anschließend in einem ersten Segment 5 durch Strangführungsrollen 9 gestützt und geführt sowie durch Spritzdüsen 24 weiter abgekühlt (Schritt c). In Schritt d hat der Blockstrang B1 seine Ziellänge bzw. sein Zielgewicht erreicht und das Eingießen von Stahlschmelze wurde gestoppt. Der Blockstrang B1 wird dennoch weiter aus der Kokille 3 ausgezogen, zumindest so lange, bis das obere Ende des Blockstrangs B1 (auch Blockstrangende genannt) ein oberes Ende der schwenkbaren Strangführung 6 erreicht hat (Schritt e). Der teilerstarrte Blockstrang B1 wird anschließend bis zur vollständigen Durcherstarrung durch Isolierklappen 11 gesteuert bzw. geregelt abgekühlt und anschließend mittels der schwenkbaren Strangführung 6 ausgefördert. Dabei stützt sich der Blockstrang B1 am Kaltstrang 19 ab. Das Ausfördern des durcherstarrten ersten Blockstrangs B1 aus der ersten Gießanlage GA1 - Schritt f - ist in den Fig 7 und 8 nicht explizit gezeigt, hier wird z.B. auf die Fig 1 mit der strichliert dargestellten Stellung der schwenkbaren Strangführung 6 und des Strangführungsrahmens 7, sowie auf die Fig 2, 3 (jeweils Pfeilrichtung) und Fig 5 verwiesen. Hierbei soll jedoch darauf hingewiesen werden, dass nicht notwendigerweise der erste Blockstrang B1 aus der ersten Gießanlage GA1 ausgefördert wird, bevor der Gießbetrieb der zweiten Gießanlage GA2 gestartet wird. In der zweiten Gießanlage GA2 findet in Fig 7 noch kein Gießbetrieb statt.The process sequence according to the invention is shown in Fig 7 and 8th shown on the basis of a single-strand first casting plant GA1 and a single-strand second casting plant GA2. In step a shown on the far left, the molds were 3 of the two Casting systems GA1, GA2 already sealed by a cold strand 19, for example in the casting direction by "top feeding" or counter to the casting direction by "bottom feeding", and the tundish 2 or the casting ladle 1 is located above the first casting system GA1. After the pouring of molten steel into the mold 3 of the first casting installation GA1 has started (step b), for example by lifting a plug in the tundish 2, a mold level forms in the mold. As a result of the solidification of the steel melt on the mold 3, a completely solidified block strand start and a partially solidified first block strand B1 are formed. The first block strand B1 is then pulled out of the mold 3 by a cold strand extraction system 20, 21, 22 and then supported and guided in a first segment 5 by strand guide rollers 9 and further cooled by spray nozzles 24 (step c). In step d, the block strand B1 has reached its target length or its target weight and the pouring of molten steel was stopped. The block strand B1 is still pulled out of the mold 3, at least until the upper end of the block strand B1 (also called the block strand end) has reached an upper end of the pivotable strand guide 6 (step e). The partially solidified block strand B1 is then cooled in a controlled or regulated manner by insulating flaps 11 until it has completely solidified and is then conveyed out by means of the pivotable strand guide 6. The block strand B1 is supported on the cold strand 19. The conveyance of the solidified first block strand B1 from the first casting plant GA1 - step f - is in the Fig 7 and 8th not explicitly shown, here, for example, the Fig 1 with the position of the pivotable strand guide 6 and the strand guide frame 7 shown in dashed lines, as well as on the Fig 2, 3 (direction of arrow) and Fig 5 referenced. It should be pointed out here, however, that the first block strand B1 is not necessarily conveyed out of the first casting installation GA1 before the casting operation of the second casting installation GA2 is started. In the second casting plant GA2 takes place in Fig 7 no casting operation has yet taken place.

In Fig 8 wurde die Gießpfanne 1 bzw. die Verteilerrinne 2 zur zweiten Gießanlage GA2 in Pfeilrichtung verfahren und befindet sich oberhalb der Kokille 3 der zweiten Gießanlage GA2 (Schritt g) Die Kokille 3 wurde wiederum durch einen Kaltstrang 19 abgedichtet. Hierbei ist es unwesentlich, wann die Kokille 3 tatsächlich abgedichtet wurde. Wesentlich ist nur, dass die Kokille verschlossen ist, sobald mit dem Eingießen von Stahlschmelze begonnen wird. In Schritt h wird analog zu Schritt b Stahlschmelze in die Kokille 3 der zweiten Gießanlage eingegossen, anschließen der zweite Blockstrang B2 aus der Kokille 3 der zweiten Gießanlage GA2 ausgezogen, im ersten Segment 5 gestützt und geführt und ggf. weiter abgekühlt, das Eingießen von Stahlschmelze gestoppt (Schritt i), das Ausziehen des zweiten Blockstrangs B2 gestoppt (Schritt k) und anschließen der zweite Blockstrang B2 bis zur vollständigen Durcherstarrung durch Isolierklappen 11 wärmeisoliert. Das Ausfördern des zweiten Blockstrangs erfolgt wiederum mittels der schwenkbaren Strangführung 6.In Fig 8 the casting ladle 1 or the tundish 2 was moved to the second casting installation GA2 in the direction of the arrow and is located above the mold 3 of the second casting installation GA2 (step g). It is immaterial here when the mold 3 was actually sealed. It is only essential that the mold is closed as soon as molten steel is poured in. In step h, analogous to step b, molten steel is poured into the mold 3 of the second casting plant, then the second strand B2 is pulled out of the mold 3 of the second casting plant GA2, supported and guided in the first segment 5 and, if necessary, further cooled, the pouring of molten steel stopped (step i), the pulling out of the second block strand B2 stopped (step k) and then the second block strand B2 is thermally insulated by insulating flaps 11 until complete solidification. The second block strand is conveyed out again by means of the pivotable strand guide 6.

Bei dem erfindungsgemäßen Verfahren spielt es keine Rolle, ob die erste Gießanlage GA1 wie in den Fig 7 und 8 einsträngig oder z.B. zweisträngig ist. Bei einer zweisträngigen ersten Gießanlage GA1 würden zwei Kokillen durch eine längere Verteilerrinne 2 mit Schmelze versorgt, sodass sich z.B. parallel zwei erste Blockstränge B1 ausbilden.In the method according to the invention, it does not matter whether the first casting installation GA1 as in FIG Fig 7 and 8th is single-stranded or, for example, two-stranded. In the case of a two-strand first casting plant GA1, two molds would be supplied with melt through a longer distributor channel 2, so that, for example, two first ingot strands B1 are formed in parallel.

Die Fig 3 zeigt die schwenkbare Strangführung 6 einer zweisträngigen Gießanlage mit Isolierklappen 11. Der erste und der zweite Blockstrang B1, B2 können jeweils seitlich ausgeschwenkt werden, wobei die Pfeile die Ausschwenkrichtung angeben. Durch die angegebene Anordnung der Strangführungen 6 für die beiden Blockstränge B1 und B2 kann die Anlage sehr kompakt gebaut werden und insbesondere ein kurzer Strangabstand 14 eingehalten werden.The Fig 3 shows the pivotable strand guide 6 of a two-strand casting plant with insulating flaps 11. The first and the second block strand B1, B2 can each be pivoted out to the side, the arrows indicating the pivoting direction. As a result of the specified arrangement of the strand guides 6 for the two block strands B1 and B2, the system can be built very compact and, in particular, a short strand spacing 14 can be maintained.

Die Fig 4 zeigt eine zu Fig 3 alternative Anordnung der Strangführungen 6, wobei der Strangabstand 14 zwischen dem ersten und dem zweiten Blockstrang B1, B2 wesentlich größer ist als in Fig 3. In diesem Fall sind die Kaltstrangtraversen 20 der ersten und der zweiten Gießanlage GA1, GA2 kollinear angeordnet, sodass ich ein größerer Strangabstand 14 ergibt. Die Blockstränge B1, B2 sind jeweils nach vorne ausschwenkbar; die Isolierklappen 11 sind jeweils mit der schwenkbaren Strangführung 6 der ersten und der zweiten Gießanlage GA1, GA2 verbunden.The Fig 4 shows one to Fig 3 alternative arrangement of the strand guides 6, the strand spacing 14 between the first and second block strand B1, B2 is much larger than in Fig 3 . In this case, the cold strand traverses 20 of the first and second casting systems GA1, GA2 are arranged collinearly, so that a larger strand spacing 14 results. The block strands B1, B2 can each be swiveled forward; the insulating flaps 11 are each connected to the pivotable strand guide 6 of the first and second casting plants GA1, GA2.

In Fig 6 ist die Strangführung 6 mit weiteren Details dargestellt. Der in der linken Ansicht mit zwei unterschiedlichen Durchmessern dargestellte kreisrunde Blockstrang B1 wird am Umfang durch drei Strangführungsrollen 9 gestützt, wobei eine Strangführungsrollen 9 von einem linear verfahrbaren Hydraulikzylinder 13 und zwei weitere Strangführungsrollen 9 von je einem schwenkbaren Führungshebel 12 gehalten wird. Die Isolierklappen 11 werden von einem Antrieb 23 ein- und ausgeschwenkt.In Fig 6 the strand guide 6 is shown with further details. The circular block strand B1 shown in the left view with two different diameters is supported on the circumference by three strand guide rollers 9, one strand guide roller 9 being held by a linearly movable hydraulic cylinder 13 and two further strand guide rollers 9 each by a pivotable guide lever 12. The insulating flaps 11 are pivoted in and out by a drive 23.

Die Fig 5 zeigt das Ausfördern eines Blockstrangs B1 aus der ersten Gießanlage GA1 mittels einer schwenkbaren Strangführung 6. Konkret weist der Strangführungsrahmen 7 der schwenkbaren Strangführung 6 eine vertikale Drehachse DA auf, sodass der Blockstrang B1 mit den ihn haltenden Strangführungsrollen 9 ausgeschwenkt werden kann. Nach dem Ausschwenken kann der Blockstrang B1 entweder direkt von einem Kran aus der schwenkbaren Strangführung 6 genommen, die Strangführungsrollen 9 gelöst und der Blockstrang B1 abtransportiert werden, oder der Blockstrang B1 wird von einem weiteren Manipulator 18 abgesenkt und anschließend ausgefördert.The Fig 5 shows the conveyance of a block strand B1 from the first casting plant GA1 by means of a pivotable strand guide 6. Specifically, the strand guide frame 7 of the pivotable strand guide 6 has a vertical axis of rotation DA, so that the block strand B1 with the strand guide rollers 9 holding it can be pivoted out. After swinging out, the block strand B1 can either be taken directly from the pivotable strand guide 6 by a crane, the strand guide rollers 9 released and the block strand B1 transported away, or the block strand B1 is lowered by a further manipulator 18 and then conveyed out.

In Fig 9 ist ein Seitenriss einer erfindungsgemäßen Anlage gezeigt. Im Unterschied zu Fig 1 erfolgt der Antrieb des Kaltstrangs 19 und der Kaltstrangtraverse 20 über zwei Antriebe 21 und dazugehörige Spindeln. Die Verteilerrinne 2 mit zwei Stopfen kann eine zweisträngige erste Gießanlage GA1 und eine einsträngige zweite Gießanlage GA2 versorgen. Die schwenkbare Strangführung 6 mit dem Strangführungsrahmen 7 wird über einen Hydraulikzylinder 13 verschwenkt (siehe Pfeil für die Schwenkrichtung); zusätzlich kann der Strangführungsrahmen 7 im ausgeschwenkten Zustand linear verfahren werden, sodass der Blockstrang B1 einfach entnommen werden kann.In Fig 9 a side elevation of a system according to the invention is shown. In contrast to Fig 1 the cold strand 19 and the cold strand traverse 20 are driven via two drives 21 and associated spindles. The distribution channel 2 with two plugs can supply a two-strand first casting plant GA1 and a single-strand second casting plant GA2. The pivotable strand guide 6 with the strand guide frame 7 is pivoted via a hydraulic cylinder 13 (see arrow for the pivoting direction); In addition, the strand guide frame 7 can be moved linearly in the swiveled-out state, so that the block strand B1 can easily be removed.

BezugszeichenlisteList of reference symbols

11
GießpfanneLadle
22
VerteilerrinneDistribution channel
33
KokilleMold
44th
OszilliererOscillator
55
erstes Segmentfirst segment
66th
StrangführungStrand guide
77th
StrangführungsrahmenStrand guide frame
88th
StrangführungssektionStrand guide section
99
StrangführungsrolleStrand guide roller
1010
AnlagentraggerüstPlant support frame
1111
IsolierklappenInsulating flaps
1212th
FührungshebelGuide lever
1313th
HydraulikzylinderHydraulic cylinder
1414th
StrangabstandStrand spacing
1818th
Manipulatormanipulator
1919th
KaltstrangCold strand
2020th
KaltstrangtraverseCold strand traverse
2121
Antriebdrive
2222nd
KettenradSprocket
2323
Antriebdrive
2424
SpritzdüsenSpray nozzles
B1B1
erster Blockstrangfirst block strand
B2B2
zweiter Blockstrangsecond block strand
DATHERE
DrehachseAxis of rotation
GA1GA1
erste Gießanlagefirst casting plant
GA2GA2
zweite Gießanlagesecond casting plant

Claims (15)

  1. Installation for the semi-continuous casting of slabs (B1, B2) having a single- or multi-strand first caster (GA1) for the continuous casting of at least one first slab (B1) and a single- or multi-strand second caster (GA2) for the continuous casting of at least one second slab (B2), wherein each strand of the first and second casters (GA1, GA2) comprises the following subassemblies:
    - a mould (3) with an oscillator (4) for oscillating the mould (3), wherein a partially solidified slab (B1, B2) forms in the mould (3);
    - a first segment (5) for supporting and guiding the partially solidified slab (B1, B2);
    - a pivotable strand guide (6) having a strand guiding frame (7) and at least one strand guiding section (8), wherein the strand guiding section (8) has at least one strand guiding device, preferably three strand guiding rollers (9), for supporting and guiding the slab (B1, B2) and the pivotable strand guide (6) is pivotable about a pivot axis (DA) for discharging the slab (B1, B2);
    - insulating flaps (11) for the adjustable thermal insulation of the slab (B1, B2), wherein the insulating flaps are arranged either on the pivotable strand guide (6) or a stationary installation carrying frame (10);
    - a dummy bar withdrawal system (20, 21, 22) for withdrawing a dummy bar (19) from the mould (3) and for supporting the slab (B1, B2).
  2. Installation according to Claim 1, characterized in that the pivotable strand guide (6) has a horizontal pivot axis (DA) for tilting and discharging the slab (B1, B2) substantially transversely to the casting direction.
  3. Installation according to Claim 1, characterized in that the pivotable strand guide (6) has a vertical pivot axis (DA) for pivoting out and discharging the slab (B1, B2) in the casting direction.
  4. Installation according to one of the preceding claims, characterized in that the pivotable strand guide (6) has only loose sides, so that the centre point of the slab (B1, B2) remains constant when there is a change of format.
  5. Installation according to Claim 4, characterized in that a strand guiding roller (9) can be placed against the slab (B1, B2) by linear movement and two further strand guiding rollers (9) can be placed against the slab (B1, B2) by pivoting two guide levers (12).
  6. Installation according to one of the preceding claims, characterized in that a drive can pivot the insulating flaps (11) about a vertical pivot axis and, in the closed position, the insulating flaps (11) enclose the slab (B1, B2).
  7. Installation according to Claim 6, characterized in that the movement of two radially opposite insulating flaps (11) is synchronized by a synchronizing means, for example a gearwheel.
  8. Installation according to one of the preceding claims, characterized in that a free area is arranged between the end of the first segment (5) and the pivotable strand guide (6) in the casting direction.
  9. Method for the semi-continuous casting of slabs (B1, B2) in an installation, preferably according to one of the preceding claims, comprising a single- or multi-strand first caster (GA1) for the continuous casting of at least one first slab (B1) and a single- or multi-strand second caster (GA2) for the continuous casting of at least one second slab (B2), comprising the steps of:
    - closing a mould (3) of the first caster (GA1), so that a dummy bar (19) leaves the mould (3) in a fluidically sealed manner;
    - pouring molten steel into the mould (3) from a distributing launder (2) or a pouring ladle (1), whereby a partially solidified first slab (B1) forms in the mould (3);
    - withdrawing the first slab (B1) from the mould (3) by means of a dummy bar withdrawal system (20, 21, 22) wherein the first slab (B1) is supported and guided at least in a first segment (5) of the first caster (GA1);
    - stopping the pouring of molten steel into the mould (3), whereby an end of the slab forms;
    - stopping the withdrawal at the earliest after the end of the slab has reached an upper end of a strand guide (6) of the first caster (GA1) that is pivotable about a pivot axis (DA);
    - thermally insulating by insulating flaps (11) until the first slab (B1) has completely solidified through;
    - discharging the solidified-through first slab (B1) from the first caster (GA1) by the pivotable strand guide (6);
    - closing a mould (3) of the second caster (GA2), so that a dummy bar (19) leaves the mould (3) in a fluidically sealed manner;
    - moving the distributing launder (2) or the pouring ladle (1) to the second caster (GA2);
    - pouring molten steel into the mould (3) of the second caster (GA2), whereby a partially solidified second slab (B2) forms in the mould (3);
    - withdrawing the second slab (B2) from the mould (3) of the second caster (GA2) by means of a dummy bar withdrawal system (20, 21, 22), wherein the second strand (B2) is supported and guided at least in a first segment (5) of the second caster (GA2);
    - stopping the pouring of molten steel into the mould (3) of the second caster (GA2), whereby an end of the slab forms;
    - stopping the withdrawal at the earliest after the end of the slab has reached an upper end of a strand guide (6) of the second caster (GA2) that is pivotable about a pivot axis (DA), wherein at least one step, preferably two or more than two steps, particularly preferably all of the steps, from the group comprising
    - moving the distributing launder (2) or the pouring ladle (1),
    - pouring molten steel into the mould (3) of the second caster (GA2),
    - withdrawing the second slab (B2),
    - stopping the pouring in and
    - stopping the withdrawal,
    are carried out while thermally insulating the first slab (B1) in the first caster (GA1),
    - thermally insulating by insulating flaps (11) until the second slab (B2) has completely solidified through;
    - discharging the solidified-through second slab (B2) from the first caster (GA2) by the pivotable strand guide (6).
  10. Method according to Claim 9, characterized in that the discharging is performed by tilting the pivotable strand guide (6) about a horizontal pivot axis (DA), and the slab (B1, B2) is subsequently discharged substantially transversely to the casting direction.
  11. Method according to Claim 9, characterized in that the discharging is performed by pivoting out the pivotable strand guide (6) about a vertical pivot axis (DA), and the slab (B1, B2) is subsequently discharged in the casting direction.
  12. Method according to one of Claims 9 to 11, characterized in that the slab (B1, B2) is electromagnetically stirred in the mould (3) and/or
    in that the slab (B1, B2) is electromagnetically stirred during the thermal insulation.
  13. Method according to one of Claims 9 to 12, characterized in that the insulating flaps (11) are opened, a strand stirrer is introduced into the area of the opened insulating flaps, and subsequently the strand stirrer electromagnetically stirs the slab (B1, B2).
  14. Method according to Claim 13, characterized in that, after the electromagnetic stirring of the slab (B1, B2), the strand stirrer is removed from the area of the opened insulating flaps (11), and subsequently the insulating flaps (11) are at least partially closed.
  15. Method according to one of Claims 9 to 14, characterized in that the end of the slab of at least one slab (B1, B2) is at least partially heated during the thermal insulation of the slab (B1, B2) by a "hot topping" treatment.
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AT522265B1 (en) * 2019-03-06 2021-12-15 Primetals Technologies Austria GmbH MODIFICATION OF A CONTINUOUS CASTING PLANT FOR BILLETS OR BLOCKS
CN115194111B (en) * 2022-07-21 2024-04-30 武汉大西洋连铸设备工程有限责任公司 Semi-continuous casting vertical casting process and equipment for large round billets to extra-large round billets

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DE3542518A1 (en) 1985-12-02 1987-06-04 Mannesmann Ag FURNITURE FOR VERTICAL, DISCONTINUOUS CONTINUOUS CASTING OF METALS, ESPECIALLY STEEL
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