EP3223979B1 - Continuous casting installation for thin slabs - Google Patents

Continuous casting installation for thin slabs Download PDF

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Publication number
EP3223979B1
EP3223979B1 EP15801184.1A EP15801184A EP3223979B1 EP 3223979 B1 EP3223979 B1 EP 3223979B1 EP 15801184 A EP15801184 A EP 15801184A EP 3223979 B1 EP3223979 B1 EP 3223979B1
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EP
European Patent Office
Prior art keywords
furnace
strand
bending
rollers
straightening
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EP15801184.1A
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German (de)
French (fr)
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EP3223979A1 (en
Inventor
Thomas Heimann
Markus Reifferscheid
Uwe Plociennik
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SMS Group GmbH
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SMS Group 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
    • B22D11/12—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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • 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
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting

Definitions

  • the invention relates to a device for continuous casting of thin slabs with a strand guide arranged in the casting direction behind a mold, an adjoining bending / straightening area for deflecting the cast strand, a cutting device for cutting the strand in thin slabs and a furnace for temperature compensation in the strand is provided.
  • a plant for the casting of thin slabs goes for example from the WO 2007/101685 A1 out.
  • the cast strand is guided vertically downwards by means of a strand guide.
  • the strand leaves the strand guide, it is solidified.
  • the cast strand is bent and straightened only after solidification to avoid undesirable strand elongation and cracking. Due to the vertically downwardly directed leadership of the strand and the adjoining Deflection in the horizontal, this type of plant is also called vertical turning plant. After bending and straightening the strand follows a temperature compensation furnace, which is not discussed in detail in the WO document.
  • the FIG. 1a shows a vertical turning plant of the prior art.
  • the reference numeral 10 denotes a funnel mold, from which the cast steel emerges vertically as strand 1 downwards.
  • the thus formed strand 1 is then guided along a strand guide 20 (further vertically downwards) and cooled by means of cooling segments 30.
  • the cooling segments 30 form the so-called secondary cooling.
  • the strand 1 is completely solidified.
  • the strand 1 then passes below the strand guide 20 in the bending region 40, where it is exposed to bending forces and on the other hand actively driven in the conveying direction. This is done by means of rollers and roller pairs 41, whose location from the FIG. 1a evident.
  • the bending region 40 is followed by the straightening region 50, in which the strand 1 is brought into horizontal alignment.
  • rollers 51 are provided.
  • One or more of the rollers 41, 51 are drive rollers and drive the strand in the transport direction, other rollers 41, 51 serve to guide and align the strand 1.
  • the rollers 41 and 51 form means for driving and bending the strand.
  • the strand 1 is cut into thin slabs by means of a cutting device 60 (sometimes simply called scissors in the figures).
  • the isolated slabs are in the FIG. 1a not shown separately.
  • the slabs then pass into a furnace 70, the inlet of which is designated by the reference numeral 71.
  • the furnace 70 is designed as a tunnel furnace and serves as a connection of the casting machine with a rolling mill, not shown, and to compensate for the thin slab temperature (seen in the cross-sectional direction of the slab).
  • the transport direction of the strand 1 or the slabs is indicated by an arrow line T.
  • FIG. 1b An exemplary temperature profile of the strand 1 along the transport direction is in the FIG. 1b shown.
  • the graph shows the temperature profile on the surface of the strand 1, in the core and the average temperature as a function of the distance, starting from the mold level of the mold, for a low-carbon material with a slab dimension of 1,600 mm x 60 mm at a casting speed of 5.2 m / min.
  • the solidification is about 7.4 m, about 0.5 m before the last roll of the cooling segments 30.
  • the average temperature of the strand 1 between the end of the cooling segments 30 decreases - over bending range 40, straightening area 50 and cutting device 60 - strongly down to the kiln inlet 71.
  • the average temperature drops from about 1.247 ° C after the cooling segments 30 by about 200 ° C to about 1041 ° C from.
  • FIG. 2a An alternative, more compact design of the CSP plant is in the FIG. 2a shown.
  • An exemplary temperature profile of the strand 1 along the transport direction is derived from the FIG. 2b out.
  • Analogous to FIG. 1b shows the graphic of the FIG. 2b the temperature profile on the surface of the strand 1, in the core and the average temperature as a function of the distance, starting from the casting mirror on the mold, for a low-carbon material with a slab dimension of 1,350 mm x 40 mm at a casting speed of 4 m / minute
  • the strand guide 20 is designed to be shorter overall.
  • the system is characterized by fewer segments and has an overall lower overall height.
  • the solidification point is just before the last roll of the cooling segments 30.
  • the average temperature drops by approx. 200 ° C from 1.246 ° C to 1.041 ° C.
  • An object of the invention is to provide a device for continuous casting of thin slabs with improved energy efficiency and / or reduced size.
  • the device according to the invention is designed for the continuous casting of thin slabs.
  • thin slabs are in particular slabs with a thickness between 35 mm and 90 mm, preferably between 40 mm and 60 mm into consideration.
  • the casting of thin slabs was technically unsolved for a long time because the thin material is susceptible to stretching and cracking.
  • the redirecting and straightening of the thin strand was the subject of research and development. A comparison with plants for casting thick slabs is therefore not readily possible.
  • the device according to the invention has a strand guide which follows a funnel-shaped casting mold in the casting direction. From the mold the still molten steel in the core and solidifies from outside to inside, while it is guided by the strand guide.
  • one or more cooling segments are preferably provided.
  • the strand guide and the cooling segments are aligned along a first direction, which is preferably vertically parallel to the direction of gravity vertically from top to bottom. At the end or just before the end of the strand guide or the cooling segments of the strand is completely solidified. Subsequently, there is a bending / straightening area, which has means for urging and bending the strand in a second direction, which differs from the first direction.
  • the mentioned means for driving and bending preferably comprise rollers and / or roller pairs that may be at least partially actively driven to convey the strand along the transport direction.
  • the second direction is preferably provided substantially horizontally, so that the strand can be continued in this way to a rolling mill, which is not part of the device described here.
  • the strand is cut by means of a cutting device in thin slabs.
  • the device further comprises a first furnace, which is provided for temperature compensation in the strand, more precisely along the cross section perpendicular to the longitudinal extent thereof.
  • the first furnace extends arcuately at least partially over the bending / straightening area and partly along the second direction.
  • the oven is preferably designed as a tunnel oven.
  • the cutting device is preferably located behind the first oven in order to move the oven as far forward as possible towards the mold.
  • a technical effect of the invention is that the average temperature of the strand between the outlet from the last cooling segment to the cutting device decreases less, since the strand enters the temperature compensation furnace earlier due to the forwardly extended and bent first furnace.
  • An extension of the furnace forward is a technical innovation, which refrains from the earlier idea that no oven should be provided in the bending and / or straightening area; on the one hand, in order to leave this neuralgic area accessible, on the other hand, in order to make no temperature compensation in the strand during the bending and straightening of the strand.
  • a positive consequence of the innovation presented here are lower energy costs. This is enhanced if the furnace only needs to be heated prior to casting and at low casting speeds and otherwise can be used for passive heat balance.
  • the temperature does not drop so much, less precipitates occur, which reduces the risk of cracking and improves the mechanical properties of the slabs.
  • the Low-oxygen furnace atmosphere reduces scale growth, resulting in higher output. Overall, the furnace can be made more compact and thus the production hall shorter.
  • one or more cooling segments for cooling the strand are preferably provided in the region of the strand guide. These accelerate cooling and also allow better control over the cooling process. At or shortly before the end of the last cooling segment, the strand is solidified and can be deflected by the bending / straightening area.
  • the first furnace is preferably bent in a range between 10 ° and 80 °. Even a small extension of 10 ° forward in the directional area into it creates a reduction in the temperature drop of the strand. An extension beyond 80 ° is technically difficult to achieve. A distance between the end of the strand guide and between the end of the last cooling segment and the kiln inlet is desirable for maintenance and other reasons. However, the oven should tend to grow as close as possible to the end of the strand guide or cooling since the hot strand emits much heat, especially at high temperatures.
  • a second oven is provided behind the first oven and the cutter is provided between two ovens according to a further preferred embodiment.
  • the second oven preferably extends completely along the second direction and is not bent.
  • the second furnace can in many cases be made shorter than the first furnace, since this may be responsible only for compensating for the temperature gradient that has built up on the short open path on the cutting device.
  • the bending / straightening range of a bending area with bending rollers and a straightening area is constructed with straightening rollers, wherein one or more of the bending rollers and / or straightening rollers are arranged in the first furnace.
  • the open guidance in the bending / straightening area had long been regarded as indispensable in the casting of thin slabs.
  • the means for driving and bending the strand can be provided partially or completely in the furnace, without this technical measure having a negative effect on the quality of the thin slabs.
  • the means, such as the rollers, for driving and bending the strand, which are located in the oven must be made of a heat-resistant material.
  • a cooling device may also be provided for cooling the corresponding means.
  • the technical measures mentioned (cooling and / or heat-resistant material) are particularly preferred for the so-called straightening rollers in the directional range.
  • a Wasserabstreifer is provided for the removal of spray before entering the first furnace. Extending the stove forward and bending it upwards prevents water from entering the oven.
  • the water scraper can be realized by means of one or more stripping plates and / or air pressure and / or water radiation and / or by means of a suction device.
  • the area at the inlet of the first furnace is preferably designed such that a strand, for example the cold strand and / or the strand in the event of an accident, can be conducted past the furnace. This can be achieved by beveling the kiln inlet. Alternatively or additionally, the kiln inlet or the front portion of the first furnace is at least on the Bottom formed movable.
  • one or more heat-resistant cameras are preferably provided in the first furnace.
  • one or more rollers are preferably provided movable in the bending / straightening area. This is especially preferred for the rolls in the area of the kiln inlet.
  • the FIG. 1a shows a conventional CSP plant with horizontal furnace; the FIG. 1b shows temperature profiles of a strand cast therewith as a function of the distance from the casting mirror.
  • FIG. 2a shows a conventional CSP compact system with horizontal furnace; the FIG. 2b shows temperature profiles of a strand cast therewith as a function of the distance from the casting mirror.
  • FIG. 3 shows a CSP plant according to a bent furnace embodiment.
  • FIG. 4 shows an enlarged section of the kiln inlet of the embodiment of FIG. 3 .
  • FIG. 5a shows a CSP plant according to another embodiment with two ovens; the FIG. 5b shows a temperature profile of a strand cast therewith as a function of the distance from the casting mirror.
  • FIG. 6a shows a CSP compact system according to another embodiment with two ovens; the FIG. 6b shows a temperature profile of a strand cast therewith as a function of the distance from the casting mirror.
  • the FIG. 3 shows a vertical turning plant according to a first embodiment.
  • the reference numeral 10 denotes a funnel mold, from which the cast steel emerges vertically as strand 1 downwards.
  • the thus formed strand 1 is then guided along a strand guide 20 (further vertically downwards) and cooled by means of cooling segments 30.
  • the cooling segments 30 form the so-called secondary cooling.
  • the strand 1 is completely solidified.
  • the strand 1 then passes below the Strand guide 20 in the bending region 40, where it is exposed to bending forces. This is done by means of rollers and roller pairs 41, whose location from the FIG. 1a evident.
  • the bending region 40 is followed by the straightening region 50, in which the strand 1 is brought into horizontal alignment.
  • rollers 51 are provided.
  • One or more of the rollers 41, 51 are drive rollers and drive the strand in the transport direction, other rollers 41, 51 serve to guide and align the strand 1.
  • the rollers 41 and 51 form means for driving and bending the strand.
  • the oven 80 has a horizontal portion 85 (generally, a portion along the second direction) and a bent portion 86 extending at least partially over the bending / straightening area 40 , 50 stretches. Compared to the plant of FIG. 1a the oven 80 is thus extended towards the mold 10 forward in or beyond the straightening region 50 addition.
  • the furnace 80 is preferably designed as a tunnel furnace and serves to equalize the temperature in the strand. Subsequently, the strand 1 is cut by means of the cutting device 60, not shown, in thin slabs. The transport direction of the strand 1 is shown with an arrow line T.
  • the arc length of the section 86 of the furnace is preferably in the range of 10 ° to 80 °. Even a small extension of 10 ° in the directional range 50 into it creates a significant reduction in the temperature drop of the strand 1. An extension beyond 80 ° is technically difficult to achieve.
  • the strand 1 should preferably be completely solidified before the kiln inlet 81, on the other hand, a distance between the end of the strand guide 20 and between the end of the last cooling segment 30 and the kiln inlet 81 for maintenance and other reasons, which will become apparent below , desirable.
  • oven 80 should tend to stick as far as possible to the End of the cooling 30 be grown, as the hot strand 1 radiates much heat especially at high temperatures.
  • the strand 1 by means of in the FIG. 3 not shown cutting device 60 cut into thin slabs. That the positioning of the cutting device 60 is also possible otherwise, shows the FIG. 5a , which except for the execution of the furnace 80 and the position of the cutter 60 of the plant FIG. 3 like. In the FIG. 5a the cutter maintains its conventional position (compared to the installation of the FIG. 1a ).
  • the cutting device 60 is located in a space between the oven 80, which is also referred to in this context as the first oven, and a second oven 90.
  • the second oven is provided completely horizontally or along the second direction.
  • a water scraper (not shown) is preferably provided in front of the kiln inlet 81.
  • the water scraper can be realized by means of one or more stripping plates and / or air pressure and / or water radiation and / or by means of a suction device.
  • the kiln inlet 81 is preferably designed such that the cold strand can be guided past the kiln 80, in particular during removal (not shown in the figures) or the strand 1 in the event of an accident. This can be achieved by beveling the kiln inlet 81, as shown in the FIG. 4 is shown.
  • the furnace inlet 81 or the front region of the furnace 80 is designed to be movable at least on the underside, which also includes any pivoting movement.
  • cold strand is meant that strand which is introduced into the casting plant before casting. On this cold strand, the liquid material is poured.
  • the cold strand is used to ensure that the still liquid at the start of casting material is not fast through the Cooling segments 30 flows, but only forms a solid strand shell and then slowly pulled together with the dummy strand through the secondary cooling 30. After cooling, the material is solidified and can be continued without cold strand.
  • This cold strand is to be separated according to this embodiment in front of the furnace 80 from the real strand 1 and removed vertically downwards.
  • the cold strand can be manufactured as a cold strand chain.
  • one or more of the rollers 41, 51 are slidably provided.
  • the positions of the two inlet rollers, which are designated by the reference numeral 82, are preferably provided changeable.
  • Such movability can also be provided for other rollers, in particular the straightening rollers 51.
  • the oven 80 must provide sufficient space to the top so that the straightening rollers 51 can be opened wide enough for strand guide 20.
  • the adjustment of the respective rollers 41, 51 in the oven 80, the moving apart of pairs of rollers, etc. can be realized by means of a hydraulic control.
  • one or more heat-resistant cameras are installed in the oven 80.
  • the furnace 80 may be designed as a passive furnace which will only actively heat when casting or at low casting speeds (lower average temperature); otherwise it serves as good isolation. Whether the kiln 80 is operated as an active or passive kiln can vary individually and depends heavily on the concrete casting conditions. Examples will be discussed below.
  • the straightening rollers 51 are preferably cooled.
  • the rollers 51 are made of a high-strength and heat-resistant material, so that no heat is released through the rollers 51.
  • FIG. 5a shows an embodiment that the the FIG. 3 is similar. Instead of a furnace 80, however, two furnaces 80 and 90 are provided, between which the cutting device 60 is arranged.
  • FIG. 5b An exemplary temperature profile of the strand 1 along the transport direction is in the FIG. 5b shown.
  • the graph shows the temperature profile on the surface of the strand 1, in the core and the average temperature as a function of the distance, starting from the mold level of the mold, for a low-carbon material with a slab dimension of 1,600 mm x 60 mm at a casting speed of 5.2 m / min.
  • the 60 mm thick strand is cast in the CSP plant with a metallurgical length of about 8 m.
  • a low-carbon material with a liquidus temperature of 1,529 ° C and solidus temperature of 1,499 ° C solidifies at an overheating of 25 ° C after about 7.4 m.
  • the first furnace 80 in this example is about 6 meters long and does not need to actively heat the strand 1 at this casting speed. At least, however, it has to be raised to 1,200 ° C before the first casting.
  • the straightening rollers 51 located in the first oven 80 substantially remove no heat from the strand 1.
  • the furnace outlet which is designated by the reference numeral 84
  • the temperature has balanced in the strand 1 and is at each cross-sectional position about 1,200 ° C.
  • the Cutting device 60 are located. Due to the free heat radiation and roller contact, the average temperature of the strand 1 decreases by about 50 ° C to about 1,150 ° C from.
  • the strand 1 now passes into the second furnace 90. Therein a renewed temperature compensation takes place.
  • the temperature in the strand 1 has again compensated if necessary without active heating, and the strand 1 can directly in running in the subsequent rolling mill.
  • ovens 80, 90 can be built much longer and the position of cutter 60 could be placed farther back.
  • FIG. 6a An alternative embodiment, which relates to the compact system of FIG. 2a is in the FIG. 6a shown.
  • the temperature course of the plant goes out of the FIG. 6b out.
  • Analogous to FIG. 2b shows the graphic of the FIG. 6b the temperature profile on the surface of the strand 1, in the core and the average temperature as a function of the distance, starting from the casting mirror on the mold, for a low-carbon material with a slab dimension of 1,350 mm x 40 mm at a casting speed of 4 m / minute
  • the structure of the individual components and their functions remain valid, and a repetitive description is omitted to avoid redundancy.
  • a positive consequence is lower energy costs. This is enhanced when the oven 80 and / or 90 just before casting and at low Casting speeds must be heated and otherwise can be used for passive heat balance. Since the temperature does not drop so much, less precipitates occur, which reduces the risk of cracking and improves the mechanical properties of the slabs.
  • the low-oxygen furnace atmosphere reduces scale growth, resulting in higher output. Overall, the furnace can be made more compact and thus the production hall shorter.
  • the average strand temperature is also high enough for the subsequent rolling mill when installing a cutting device between two ovens 80 and 90 (about 3 m free radiation).

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Description

Technisches GebietTechnical area

Die Erfindung betrifft eine Vorrichtung zum Stranggießen von Dünnbrammen mit einer in Gießrichtung hinter einer Kokille angeordneten Strangführung, einem sich daran anschließenden Biege-/Richtbereich zum Umlenken des gegossenen Strangs, einer Schneideinrichtung zum Schneiden des Strangs in Dünnbrammen und einem Ofen, der zum Temperaturausgleich im Strang vorgesehen ist.The invention relates to a device for continuous casting of thin slabs with a strand guide arranged in the casting direction behind a mold, an adjoining bending / straightening area for deflecting the cast strand, a cutting device for cutting the strand in thin slabs and a furnace for temperature compensation in the strand is provided.

Hintergrund der ErfindungBackground of the invention

Ende der achtziger Jahre ist ein Verfahren zum Stranggießen von Dünnbrammen vorgestellt worden, das in der Fachwelt unter der Bezeichnung "Compact Strip Production" (CSP) bekannt geworden ist. Ziel war es damals, das herkömmliche Stranggießen zum "endabmessungsnahen" Gießen weiterzuentwickeln, d.h. die Brammen letztlich so dünn zu gießen, dass im Walzwerk nur noch die aus werkstoff- und verformungstechnischen Gründen notwendigen Mindestverformungen aufgebracht werden müssen und damit der Umfang der Walzstufe reduziert werden kann.At the end of the eighties, a process was presented for the continuous casting of thin slabs, which has become known in the art as "Compact Strip Production" (CSP). At that time, the aim was to further develop conventional continuous casting to "near-net-shape" casting, i. Finally, the slabs are cast so thinly that in the rolling mill only the minimum deformations necessary for material and deformation-technical reasons have to be applied and thus the circumference of the rolling stage can be reduced.

Eine Anlage zum Gießen von Dünnbrammen geht beispielsweise aus der WO 2007/101685 A1 hervor. Im Anschluss an die Kokille wird der gegossene Strang mittels einer Strangführung vertikal nach unten geführt. Wenn der Strang die Strangführung verlässt, ist er durcherstarrt. Der gegossene Strang wird erst nach der Durcherstarrung gebogen und gerichtet, um eine unerwünschte Strangdehnung und Rissbildung zu vermeiden. Aufgrund der senkrecht nach unten gerichteten Führung des Strangs und der sich daran anschließenden Umlenkung in die Horizontale wird dieser Anlagentyp auch Senkrecht-Abbiegeanlage genannt. Nach Biegen und Richten des Strangs folgt ein Temperaturausgleichsofen, auf den in der WO-Schrift nicht näher eingegangen wird.A plant for the casting of thin slabs goes for example from the WO 2007/101685 A1 out. Following the mold, the cast strand is guided vertically downwards by means of a strand guide. When the strand leaves the strand guide, it is solidified. The cast strand is bent and straightened only after solidification to avoid undesirable strand elongation and cracking. Due to the vertically downwardly directed leadership of the strand and the adjoining Deflection in the horizontal, this type of plant is also called vertical turning plant. After bending and straightening the strand follows a temperature compensation furnace, which is not discussed in detail in the WO document.

Die Figur 1a zeigt eine Senkrecht-Abbiegeanlage aus dem Stand der Technik. Mit dem Bezugszeichen 10 ist eine Trichterkokille bezeichnet, aus welcher der gegossene Stahl als Strang 1 vertikal nach unten austritt. Der so ausgeformte Strang 1 wird anschließend entlang einer Strangführung 20 (weiterhin vertikal nach unten) geführt und mittels Kühlsegmenten 30 gekühlt. Die Kühlsegmente 30 bilden die sogenannte Sekundärkühlung. Am oder kurz vor dem Ende des letzten Kühlsegments 30 ist der Strang 1 vollständig erstarrt. Der Strang 1 gelangt anschließend unterhalb der Strangführung 20 in den Biegebereich 40, wo er zum einen Biegekräften ausgesetzt und zum anderen aktiv in Förderrichtung getrieben wird. Dies geschieht mittels Rollen und Rollenpaaren 41, deren Lage aus der Figur 1a hervorgeht. An den Biegebereich 40 schließt sich der Richtbereich 50 an, in dem der Strang 1 in die horizontale Ausrichtung gebracht wird. Auch hier sind Rollen 51 vorgesehen. Eine oder mehrere der Rollen 41, 51 sind Antriebsrollen und treiben den Strang in Transportrichtung vor, andere Rollen 41, 51 dienen der Führung und Ausrichtung des Strangs 1. Insofern bilden die Rollen 41 und 51 Mittel zum Treiben und Biegen des Strangs. Anschließend wird der Strang 1 mittels einer Schneideinrichtung 60 (in den Figuren teilweise auch einfach Schere genannt) in Dünnbrammen geschnitten. Die vereinzelten Brammen sind in der Figur 1a nicht gesondert eingezeichnet. Die Brammen laufen anschließend in einen Ofen 70, dessen Einlauf mit dem Bezugszeichen 71 bezeichnet ist. Der Ofen 70 ist als Tunnelofen ausgeführt und dient als Verbindung der Gießmaschine mit einem nicht dargestellten Walzwerk und zum Ausgleich der Dünnbrammentemperatur (in Querschnittsrichtung der Bramme gesehen). Die Transportrichtung des Strangs 1 bzw. der Brammen ist mit einer Pfeillinie T eingezeichnet.The FIG. 1a shows a vertical turning plant of the prior art. The reference numeral 10 denotes a funnel mold, from which the cast steel emerges vertically as strand 1 downwards. The thus formed strand 1 is then guided along a strand guide 20 (further vertically downwards) and cooled by means of cooling segments 30. The cooling segments 30 form the so-called secondary cooling. At or shortly before the end of the last cooling segment 30, the strand 1 is completely solidified. The strand 1 then passes below the strand guide 20 in the bending region 40, where it is exposed to bending forces and on the other hand actively driven in the conveying direction. This is done by means of rollers and roller pairs 41, whose location from the FIG. 1a evident. The bending region 40 is followed by the straightening region 50, in which the strand 1 is brought into horizontal alignment. Again, rollers 51 are provided. One or more of the rollers 41, 51 are drive rollers and drive the strand in the transport direction, other rollers 41, 51 serve to guide and align the strand 1. In this respect, the rollers 41 and 51 form means for driving and bending the strand. Subsequently, the strand 1 is cut into thin slabs by means of a cutting device 60 (sometimes simply called scissors in the figures). The isolated slabs are in the FIG. 1a not shown separately. The slabs then pass into a furnace 70, the inlet of which is designated by the reference numeral 71. The furnace 70 is designed as a tunnel furnace and serves as a connection of the casting machine with a rolling mill, not shown, and to compensate for the thin slab temperature (seen in the cross-sectional direction of the slab). The transport direction of the strand 1 or the slabs is indicated by an arrow line T.

Ein beispielhaftes Temperaturprofil des Strangs 1 entlang der Transportrichtung ist in der Figur 1b gezeigt. Die Grafik zeigt den Temperaturverlauf auf der Oberfläche des Strangs 1, im Kern und die Durchschnittstemperatur als Funktion vom Abstand, ausgehend von dem Gießspiegel an der Kokille, für einen Low-Carbon-Werkstoff mit einer Brammenabmessung von 1.600 mm x 60 mm bei einer Gießgeschwindigkeit von 5,2 m/min. Die Durcherstarrung liegt bei ca. 7,4 m, etwa 0,5 m vor der letzten Rolle der Kühlsegmente 30. Durch Strahlung und den Kontakt mit den Rollen 41, 51 sinkt die Durchschnittstemperatur des Strangs 1 zwischen dem Ende der Kühlsegmente 30 - über Biegebereich 40, Richtbereich 50 und Schneideinrichtung 60 - bis zum Ofeneinlauf 71 stark ab. Die Durchschnittstemperatur sinkt von ca. 1.247 °C nach den Kühlsegmenten 30 um ca. 200 °C auf etwa 1.041 °C ab.An exemplary temperature profile of the strand 1 along the transport direction is in the FIG. 1b shown. The graph shows the temperature profile on the surface of the strand 1, in the core and the average temperature as a function of the distance, starting from the mold level of the mold, for a low-carbon material with a slab dimension of 1,600 mm x 60 mm at a casting speed of 5.2 m / min. The solidification is about 7.4 m, about 0.5 m before the last roll of the cooling segments 30. By radiation and contact with the rollers 41, 51, the average temperature of the strand 1 between the end of the cooling segments 30 decreases - over bending range 40, straightening area 50 and cutting device 60 - strongly down to the kiln inlet 71. The average temperature drops from about 1.247 ° C after the cooling segments 30 by about 200 ° C to about 1041 ° C from.

Eine alternative, kompaktere Bauform der CSP-Anlage ist in der Figur 2a gezeigt. Ein beispielhaftes Temperaturprofil des Strangs 1 entlang der Transportrichtung geht aus der Figur 2b hervor. Analog zur Figur 1b zeigt die Grafik der Figur 2b den Temperaturverlauf auf der Oberfläche des Strangs 1, im Kern und die Durchschnittstemperatur als Funktion vom Abstand, ausgehend von dem Gießspiegel an der Kokille, für einen Low-Carbon-Werkstoff mit einer Brammenabmessung von 1.350 mm x 40 mm bei einer Gießgeschwindigkeit von 4 m/min. Im Unterschied zur Bauform der Figur 1a sind hier nur zwei Kühlsegmente 30 vorgesehen, und die Strangführung 20 ist insgesamt kürzer ausgebildet. Die Anlage kommt dadurch mit weniger Segmenten aus und weist eine insgesamt geringere Bauhöhe auf. Der Erstarrungspunkt liegt kurz vor der letzten Rolle der Kühlsegmente 30. Auch hier sinkt die Durchschnittstemperatur um ca. 200 °C von 1.246 °C auf 1.041 °C ab.An alternative, more compact design of the CSP plant is in the FIG. 2a shown. An exemplary temperature profile of the strand 1 along the transport direction is derived from the FIG. 2b out. Analogous to FIG. 1b shows the graphic of the FIG. 2b the temperature profile on the surface of the strand 1, in the core and the average temperature as a function of the distance, starting from the casting mirror on the mold, for a low-carbon material with a slab dimension of 1,350 mm x 40 mm at a casting speed of 4 m / minute In contrast to the design of the FIG. 1a only two cooling segments 30 are provided here, and the strand guide 20 is designed to be shorter overall. The system is characterized by fewer segments and has an overall lower overall height. The solidification point is just before the last roll of the cooling segments 30. Here, too, the average temperature drops by approx. 200 ° C from 1.246 ° C to 1.041 ° C.

Darstellung der ErfindungPresentation of the invention

Eine Aufgabe der Erfindung besteht darin, eine Vorrichtung zum Stranggießen von Dünnbrammen mit verbesserter Energieeffizienz und/oder verringerter Baugröße anzugeben.An object of the invention is to provide a device for continuous casting of thin slabs with improved energy efficiency and / or reduced size.

Die Aufgabe wird mit einer Vorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen folgen aus den Unteransprüchen, der nachfolgenden Darstellung der Erfindung sowie der Beschreibung bevorzugter Ausführungsbeispiele.The object is achieved with a device having the features of claim 1. Advantageous developments follow from the subclaims, the following description of the invention and the description of preferred embodiments.

Die erfindungsgemäße Vorrichtung ist zum Stranggießen von Dünnbrammen ausgelegt. Als Dünnbrammen kommen insbesondere Brammen mit einer Dicke zwischen 35 mm und 90 mm, bevorzugt zwischen 40 mm und 60 mm, in Betracht. Das Gießen von Dünnbrammen war lange Zeit technisch ungelöst, da das dünne Material dehnungs- und rissanfällig ist. Neben anderen Aspekten war das Umlenken und Richten des dünnen Strangs Gegenstand von Forschung und Entwicklung. Ein Vergleich mit Anlagen zum Gießen von Dickbrammen ist daher nicht ohne weiteres möglich.The device according to the invention is designed for the continuous casting of thin slabs. As thin slabs are in particular slabs with a thickness between 35 mm and 90 mm, preferably between 40 mm and 60 mm into consideration. The casting of thin slabs was technically unsolved for a long time because the thin material is susceptible to stretching and cracking. Among other aspects, the redirecting and straightening of the thin strand was the subject of research and development. A comparison with plants for casting thick slabs is therefore not readily possible.

Die erfindungsgemäße Vorrichtung weist eine Strangführung auf, die einer trichterförmigen Gießkokille in Gießrichtung folgt. Aus der Kokille tritt der im Kern noch geschmolzene Stahl und erstarrt von außen nach innen, während er von der Strangführung geführt wird. Zur rascheren Abkühlung sind vorzugsweise ein oder mehrere Kühlsegmente vorgesehen. Die Strangführung und die Kühlsegmente sind entlang einer ersten Richtung ausgerichtet, die vorzugsweise im Wesentlichen parallel zur Schwerkraftrichtung vertikal von oben nach unten verläuft. Am Ende oder kurz vor dem Ende der Strangführung bzw. der Kühlsegmente ist der Strang vollständig erstarrt. Im Anschluss daran befindet sich ein Biege-/Richtbereich, der Mittel zum Treiben und Biegen des Strangs in eine zweite Richtung, die sich von der ersten Richtung unterscheidet, aufweist. Die angesprochenen Mittel zum Treiben und Biegen umfassen vorzugsweise Rollen und/oder Rollenpaare, die wenigstens zum Teil aktiv angetrieben sein können, um den Strang entlang der Transportrichtung zu befördern. Die zweite Richtung ist vorzugsweise im Wesentlichen horizontal vorgesehen, damit der Strang auf diese Weise zu einem Walzwerk, das nicht Teil der hier beschriebenen Vorrichtung ist, weitergeführt werden kann. Auf dem Weg dorthin wird der Strang mittels einer Schneideinrichtung in Dünnbrammen geschnitten.The device according to the invention has a strand guide which follows a funnel-shaped casting mold in the casting direction. From the mold the still molten steel in the core and solidifies from outside to inside, while it is guided by the strand guide. For faster cooling, one or more cooling segments are preferably provided. The strand guide and the cooling segments are aligned along a first direction, which is preferably vertically parallel to the direction of gravity vertically from top to bottom. At the end or just before the end of the strand guide or the cooling segments of the strand is completely solidified. Subsequently, there is a bending / straightening area, which has means for urging and bending the strand in a second direction, which differs from the first direction. The mentioned means for driving and bending preferably comprise rollers and / or roller pairs that may be at least partially actively driven to convey the strand along the transport direction. The second direction is preferably provided substantially horizontally, so that the strand can be continued in this way to a rolling mill, which is not part of the device described here. On the way there, the strand is cut by means of a cutting device in thin slabs.

Die Vorrichtung weist ferner einen ersten Ofen auf, der zum Temperaturausgleich im Strang, genauer gesagt entlang des Querschnitts senkrecht zur Längserstreckung desselben, vorgesehen ist. Der erste Ofen erstreckt sich bogenförmig wenigstens teilweise über den Biege-/Richtbereich und zum Teil entlang der zweiten Richtung. Der Ofen ist vorzugsweise als Tunnelofen ausgebildet. Die Schneideinrichtung befindet sich hierbei vorzugsweise hinter dem ersten Ofen, um den Ofen so weit wie möglich nach vorn in Richtung Kokille verschieben zu können.The device further comprises a first furnace, which is provided for temperature compensation in the strand, more precisely along the cross section perpendicular to the longitudinal extent thereof. The first furnace extends arcuately at least partially over the bending / straightening area and partly along the second direction. The oven is preferably designed as a tunnel oven. The cutting device is preferably located behind the first oven in order to move the oven as far forward as possible towards the mold.

Eine technische Wirkung der Erfindung besteht darin, dass die Durchschnittstemperatur des Strangs zwischen dem Auslauf aus dem letzten Kühlsegment bis zur Schneideinrichtung weniger stark abfällt, da der Strang aufgrund des nach vorn verlängerten und gebogenen ersten Ofens früher in den Temperaturausgleichsofen eintritt. Eine Verlängerung des Ofens nach vorn ist eine technische Neuerung, die von der früheren Vorstellung Abstand nimmt, dass im Biege- und/oder Richtbereich kein Ofen vorgesehen sein soll; zum einen, um diesen neuralgischen Bereich zugänglich zu lassen, zum anderen, um während des Biegens und Richtens des Strangs keinen Temperaturausgleich im Strang vorzunehmen. Eine positive Folge der hier dargestellten Neuerung sind geringere Energiekosten. Dies wird verstärkt, wenn der Ofen nur vor dem Angießen und bei geringen Gießgeschwindigkeiten geheizt werden muss und ansonsten zum passiven Wärmeausgleich genutzt werden kann. Da die Temperatur nicht so stark abfällt, entstehen weniger Ausscheidungen, wodurch die Rissgefahr sinkt und die mechanischen Eigenschaften der Brammen verbessert werden. Durch die sauerstoffarme Ofenatmosphäre verringert sich das Zunderwachstum, was zu einer höheren Ausbringung führt. Insgesamt kann der Ofen kompakter und damit die Fertigungshalle kürzer gebaut werden.A technical effect of the invention is that the average temperature of the strand between the outlet from the last cooling segment to the cutting device decreases less, since the strand enters the temperature compensation furnace earlier due to the forwardly extended and bent first furnace. An extension of the furnace forward is a technical innovation, which refrains from the earlier idea that no oven should be provided in the bending and / or straightening area; on the one hand, in order to leave this neuralgic area accessible, on the other hand, in order to make no temperature compensation in the strand during the bending and straightening of the strand. A positive consequence of the innovation presented here are lower energy costs. This is enhanced if the furnace only needs to be heated prior to casting and at low casting speeds and otherwise can be used for passive heat balance. Since the temperature does not drop so much, less precipitates occur, which reduces the risk of cracking and improves the mechanical properties of the slabs. By the Low-oxygen furnace atmosphere reduces scale growth, resulting in higher output. Overall, the furnace can be made more compact and thus the production hall shorter.

Im Bereich der Strangführung sind, wie bereits erwähnt, vorzugsweise ein oder mehrere Kühlsegmente zum Abkühlen des Strangs vorgesehen. Diese beschleunigen das Abkühlen und ermöglichen darüber hinaus auch eine bessere Kontrolle über den Abkühlvorgang. Am oder kurz vor dem Ende des letzten Kühlsegments ist der Strang durcherstarrt und kann durch den Biege-/Richtbereich umgelenkt werden.As already mentioned, one or more cooling segments for cooling the strand are preferably provided in the region of the strand guide. These accelerate cooling and also allow better control over the cooling process. At or shortly before the end of the last cooling segment, the strand is solidified and can be deflected by the bending / straightening area.

Der erste Ofen ist vorzugsweise in einem Bereich zwischen 10° und 80° gebogen. Bereits eine kleine Verlängerung von 10° nach vorn in den Richtbereich hinein schafft eine Minderung des Temperaturabfalls des Strangs. Eine Verlängerung über 80° hinaus ist technisch schwer realisierbar. Ein Abstand zwischen dem Ende der Strangführung bzw. zwischen dem Ende des letzten Kühlsegments und dem Ofeneinlauf ist aus wartungstechnischen und anderen Gründen wünschenswert. Tendenziell sollte der Ofen jedoch so weit wie möglich an das Ende der Strangführung bzw. Kühlung herangebaut werden, da der heiße Strang gerade bei hohen Temperaturen viel Wärme abstrahlt.The first furnace is preferably bent in a range between 10 ° and 80 °. Even a small extension of 10 ° forward in the directional area into it creates a reduction in the temperature drop of the strand. An extension beyond 80 ° is technically difficult to achieve. A distance between the end of the strand guide and between the end of the last cooling segment and the kiln inlet is desirable for maintenance and other reasons. However, the oven should tend to grow as close as possible to the end of the strand guide or cooling since the hot strand emits much heat, especially at high temperatures.

Um die Erfindung einfach in bestehende Anlagen integrieren zu können (beispielsweise um ein Umsetzten der Schneideinrichtung zu vermeiden), ist gemäß einem weiteren bevorzugten Ausführungsbeispiel hinter dem ersten Ofen ein zweiter Ofen und zwischen beiden Öfen die Schneideinrichtung vorgesehen. Der zweite Ofen erstreckt sich vorzugsweise vollständig entlang der zweiten Richtung und ist nicht gebogen. Der zweite Ofen kann in vielen Fällen kürzer ausgeführt sein als der erste Ofen, da dieser ggf. lediglich zum Ausgleich des Temperaturgefälles, das sich auf der kurzen offenen Wegstrecke an der Schneideinrichtung aufgebaut hat, verantwortlich ist.In order to be able to easily integrate the invention into existing systems (for example in order to avoid a conversion of the cutting device), a second oven is provided behind the first oven and the cutter is provided between two ovens according to a further preferred embodiment. The second oven preferably extends completely along the second direction and is not bent. The second furnace can in many cases be made shorter than the first furnace, since this may be responsible only for compensating for the temperature gradient that has built up on the short open path on the cutting device.

Vorzugsweise wird der Biege-/Richtbereich von einem Biegebereich mit Biegerollen und einem Richtbereich mit Richtrollen aufgebaut, wobei eine oder mehrere der Biegerollen und/oder Richtrollen im ersten Ofen angeordnet sind. Die offene Führung im Biege-/Richtbereich war beim Gießen von Dünnbrammen lange Zeit als unabdingbar angesehen worden. Dieses technische Vorurteil wird hiermit überwunden; insbesondere können die Mittel zum Treiben und Biegen des Strangs teilweise oder vollständig im Ofen vorgesehen sein, ohne dass sich diese technische Maßnahme negativ auf die Qualität der Dünnbrammen auswirkt. Dazu müssen die Mittel, etwa die Rollen, zum Treiben und Biegen des Strangs, die sich im Ofen befinden, aus einem hitzebeständigen Material gefertigt sein. Alternativ oder zusätzlich dazu kann auch eine Kühleinrichtung zum Kühlen der entsprechenden Mittel vorgesehen sein. Die genannten technischen Maßnahmen (Kühlung und/oder hitzebeständiges Material) gelten besonders bevorzugt für die sogenannten Richtrollen im Richtbereich.Preferably, the bending / straightening range of a bending area with bending rollers and a straightening area is constructed with straightening rollers, wherein one or more of the bending rollers and / or straightening rollers are arranged in the first furnace. The open guidance in the bending / straightening area had long been regarded as indispensable in the casting of thin slabs. This technical prejudice is hereby overcome; In particular, the means for driving and bending the strand can be provided partially or completely in the furnace, without this technical measure having a negative effect on the quality of the thin slabs. For this purpose, the means, such as the rollers, for driving and bending the strand, which are located in the oven must be made of a heat-resistant material. Alternatively or additionally, a cooling device may also be provided for cooling the corresponding means. The technical measures mentioned (cooling and / or heat-resistant material) are particularly preferred for the so-called straightening rollers in the directional range.

Vorzugsweise ist vor dem Einlauf in den ersten Ofen ein Wasserabstreifer zur Entfernung von Spritzwasser vorgesehen. Indem der Ofen nach vorn verlängert und nach oben gebogen ist, kann so verhindert werden, dass Wasser in den Ofen eindringt. Der Wasserabstreifer kann etwa mittels eines oder mehrerer Abstreifbleche und/oder Luftdruck und/oder Wasserstrahlung und/oder mittels einer Absaugeinrichtung realisiert sein.Preferably, a Wasserabstreifer is provided for the removal of spray before entering the first furnace. Extending the stove forward and bending it upwards prevents water from entering the oven. The water scraper can be realized by means of one or more stripping plates and / or air pressure and / or water radiation and / or by means of a suction device.

Indem der Bereich der Umlenkung und des Richtens zum Temperaturausgleich im Strang genutzt wird, ist der Biege-/Richtbereich von außen möglicherweise schwerer zugänglich und schwer einsehbar. Um Schwierigkeiten, die sich daraus ergeben, zu überwinden, können verschiedene technische Maßnahmen vorgesehen sein. Beispielweise ist der Bereich am Einlauf des ersten Ofens vorzugsweise so gestaltet, dass ein Strang, etwa der Kaltstrang und/oder der Strang bei einer Havarie, am Ofen vorbeigeleitet werden kann. Dies kann durch Abschrägung des Ofeneinlaufs erreicht werden. Alternativ oder zusätzlich dazu ist der Ofeneinlauf oder der vordere Bereich des ersten Ofens wenigstens auf der Unterseite verfahrbar ausgebildet. Um den Prozessverlauf bequem überwachen und das Einfädeln des Strangs in den Biege-/Richtbereich einfacher gestalten zu können, sind vorzugsweise eine oder mehrere hitzebeständige Kameras im ersten Ofen vorgesehen. Aus dem gleichen Grund sind vorzugsweise eine oder mehrere Rollen im Biege-/Richtbereich verfahrbar vorgesehen. Dies gilt besonders bevorzugt für die Rollen im Bereich des Ofeneinlaufs.By using the area of deflection and straightening in the strand, the bending / straightening area may be difficult to access from the outside and difficult to see. In order to overcome difficulties resulting therefrom, various technical measures may be provided. For example, the area at the inlet of the first furnace is preferably designed such that a strand, for example the cold strand and / or the strand in the event of an accident, can be conducted past the furnace. This can be achieved by beveling the kiln inlet. Alternatively or additionally, the kiln inlet or the front portion of the first furnace is at least on the Bottom formed movable. In order to conveniently monitor the course of the process and make the threading of the strand into the bending / straightening area easier, one or more heat-resistant cameras are preferably provided in the first furnace. For the same reason, one or more rollers are preferably provided movable in the bending / straightening area. This is especially preferred for the rolls in the area of the kiln inlet.

Wenngleich die vorliegende Erfindung im technischen Umfeld von Dünnbrammenstranggießanlagen zum Einsatz kommt, kann die Erfindung ggf. auch in anderen Bereichen umgesetzt werden. Darüber hinaus sind weitere Vorteile und Merkmale der vorliegenden Erfindung aus der folgenden Beschreibung bevorzugter Ausführungsbeispiele ersichtlich. Die dort beschriebenen Merkmale können alleinstehend oder in Kombination mit einem oder mehreren der oben erwähnten Merkmale umgesetzt werden, insofern sich die Merkmale nicht widersprechen. Die folgende Beschreibung bevorzugter Ausführungsbeispiele erfolgt dabei unter Bezugnahme auf die begleitenden Zeichnungen.Although the present invention is used in the technical environment of thin slab continuous casting plants, the invention may possibly be implemented in other areas as well. In addition, other advantages and features of the present invention will become apparent from the following description of preferred embodiments. The features described therein may be implemented alone or in combination with one or more of the features mentioned above insofar as the features are not contradictory. The following description of preferred embodiments is made with reference to the accompanying drawings.

Kurze Beschreibung der FigurenBrief description of the figures

Die Figur 1a zeigt eine herkömmliche CSP-Anlage mit horizontalem Ofen; die Figur 1b zeigt Temperaturprofile eines damit gegossenen Strangs als Funktion des Abstands vom Gießspiegel.The FIG. 1a shows a conventional CSP plant with horizontal furnace; the FIG. 1b shows temperature profiles of a strand cast therewith as a function of the distance from the casting mirror.

Die Figur 2a zeigt eine herkömmliche CSP-Kompaktanlage mit horizontalem Ofen; die Figur 2b zeigt Temperaturprofile eines damit gegossenen Strangs als Funktion des Abstands vom Gießspiegel.The FIG. 2a shows a conventional CSP compact system with horizontal furnace; the FIG. 2b shows temperature profiles of a strand cast therewith as a function of the distance from the casting mirror.

Die Figur 3 zeigt eine CSP-Anlage gemäß einem Ausführungsbeispiel mit gebogenem Ofen.The FIG. 3 shows a CSP plant according to a bent furnace embodiment.

Die Figur 4 zeigt einen vergrößerten Ausschnitt am Ofeneinlauf des Ausführungsbeispiels der Figur 3.The FIG. 4 shows an enlarged section of the kiln inlet of the embodiment of FIG. 3 ,

Die Figur 5a zeigt eine CSP-Anlage gemäß einem weiteren Ausführungsbeispiel mit zwei Öfen; die Figur 5b zeigt ein Temperaturprofil eines damit gegossenen Strangs als Funktion des Abstands vom Gießspiegel.The FIG. 5a shows a CSP plant according to another embodiment with two ovens; the FIG. 5b shows a temperature profile of a strand cast therewith as a function of the distance from the casting mirror.

Die Figur 6a zeigt eine CSP-Kompaktanlage gemäß einem weiteren Ausführungsbeispiel mit zwei Öfen; die Figur 6b zeigt ein Temperaturprofil eines damit gegossenen Strangs als Funktion des Abstands vom Gießspiegel.The FIG. 6a shows a CSP compact system according to another embodiment with two ovens; the FIG. 6b shows a temperature profile of a strand cast therewith as a function of the distance from the casting mirror.

Detaillierte Beschreibung bevorzugter AusführungsbeispieleDetailed description of preferred embodiments

Im Folgenden werden beispielhafte Ausführungsformen der Erfindung im Detail mit Bezug auf die Zeichnungen beschrieben. Es sei darauf hingewiesen, dass die hierin beschriebenen Ausführungsbeispiele nicht dazu beabsichtigt sind, die Erfindung zu beschränken, sondern der Erläuterung der Erfindung dienen, wobei die dargelegten Merkmale oder Merkmalskombinationen der Ausführungsbeispiele nicht immer essentiell für die Erfindung sein müssen.Hereinafter, exemplary embodiments of the invention will be described in detail with reference to the drawings. It should be understood that the embodiments described herein are not intended to limit the invention but to serve to explain the invention, and the features or combinations of features of the embodiments may not always be essential to the invention.

Die Figur 3 zeigt eine Senkrecht-Abbiegeanlage gemäß einem ersten Ausführungsbeispiel. Mit dem Bezugszeichen 10 ist eine Trichterkokille bezeichnet, aus welcher der gegossene Stahl als Strang 1 vertikal nach unten austritt. Der so ausgeformte Strang 1 wird anschließend entlang einer Strangführung 20 (weiterhin vertikal nach unten) geführt und mittels Kühlsegmenten 30 gekühlt. Die Kühlsegmente 30 bilden die sogenannte Sekundärkühlung. Am oder kurz vor dem Ende des letzten Kühlsegments 30 ist der Strang 1 vollständig erstarrt. Der Strang 1 gelangt anschließend unterhalb der Strangführung 20 in den Biegebereich 40, wo er Biegekräften ausgesetzt ist. Dies geschieht mittels Rollen und Rollenpaaren 41, deren Lage aus der Figur 1a hervorgeht. An den Biegebereich 40 schließt sich der Richtbereich 50 an, in dem der Strang 1 in die horizontale Ausrichtung gebracht wird. Auch hier sind Rollen 51 vorgesehen. Eine oder mehrere der Rollen 41, 51 sind Antriebsrollen und treiben den Strang in Transportrichtung vor, andere Rollen 41, 51 dienen der Führung und Ausrichtung des Strangs 1. Insofern bilden die Rollen 41 und 51 Mittel zum Treiben und Biegen des Strangs.The FIG. 3 shows a vertical turning plant according to a first embodiment. The reference numeral 10 denotes a funnel mold, from which the cast steel emerges vertically as strand 1 downwards. The thus formed strand 1 is then guided along a strand guide 20 (further vertically downwards) and cooled by means of cooling segments 30. The cooling segments 30 form the so-called secondary cooling. At or shortly before the end of the last cooling segment 30, the strand 1 is completely solidified. The strand 1 then passes below the Strand guide 20 in the bending region 40, where it is exposed to bending forces. This is done by means of rollers and roller pairs 41, whose location from the FIG. 1a evident. The bending region 40 is followed by the straightening region 50, in which the strand 1 is brought into horizontal alignment. Again, rollers 51 are provided. One or more of the rollers 41, 51 are drive rollers and drive the strand in the transport direction, other rollers 41, 51 serve to guide and align the strand 1. In this respect, the rollers 41 and 51 form means for driving and bending the strand.

Im Unterschied zur Anlage der Figur 1a ist in der Figur 3 keine Schneideinrichtung 60 dargestellt, denn diese befindet sich hinter dem Ofen 80. Der Ofen 80 weist einen horizontalen Abschnitt 85 (allgemein, einen Abschnitt entlang der zweiten Richtung) sowie einen gebogenen Abschnitt 86 auf, der sich wenigstens teilweise über den Biege-/Richtbereich 40, 50 erstreckt. Im Vergleich zur Anlage der Figur 1a ist der Ofen 80 somit in Richtung Kokille 10 nach vorn in den oder über den Richtbereich 50 hinaus verlängert. Der Ofen 80 ist vorzugsweise als Tunnelofen ausgeführt und dient zum Ausgleich der Temperatur im Strang. Anschließend wird der Strang 1 mittels der nicht dargestellten Schneideinrichtung 60 in Dünnbrammen geschnitten. Die Transportrichtung des Strangs 1 ist mit einer Pfeillinie T eingezeichnet.In contrast to the investment of FIG. 1a is in the FIG. 3 no cutter 60 is shown because it is behind the oven 80. The oven 80 has a horizontal portion 85 (generally, a portion along the second direction) and a bent portion 86 extending at least partially over the bending / straightening area 40 , 50 stretches. Compared to the plant of FIG. 1a the oven 80 is thus extended towards the mold 10 forward in or beyond the straightening region 50 addition. The furnace 80 is preferably designed as a tunnel furnace and serves to equalize the temperature in the strand. Subsequently, the strand 1 is cut by means of the cutting device 60, not shown, in thin slabs. The transport direction of the strand 1 is shown with an arrow line T.

Die Bogenlänge des Abschnitts 86 des Ofens liegt vorzugsweise im Bereich von 10° bis 80°. Bereits eine kleine Verlängerung von 10° in den Richtbereich 50 hinein schafft eine deutliche Minderung des Temperaturabfalls des Strangs 1. Eine Verlängerung über 80° hinaus ist technisch schwer realisierbar. Zum einen soll der Strang 1 vorzugsweise vor dem Ofeneinlauf 81 vollständig erstarrt sein, zum anderen ist ein Abstand zwischen dem Ende der Strangführung 20 bzw. zwischen dem Ende des letzten Kühlsegments 30 und dem Ofeneinlauf 81 aus wartungstechnischen und anderen Gründen, die weiter unten deutlich werden, wünschenswert. Tendenziell sollte der Ofen 80 jedoch so weit wie möglich an das Ende der Kühlung 30 herangebaut werden, da der heiße Strang 1 gerade bei hohen Temperaturen viel Wärme abstrahlt.The arc length of the section 86 of the furnace is preferably in the range of 10 ° to 80 °. Even a small extension of 10 ° in the directional range 50 into it creates a significant reduction in the temperature drop of the strand 1. An extension beyond 80 ° is technically difficult to achieve. On the one hand, the strand 1 should preferably be completely solidified before the kiln inlet 81, on the other hand, a distance between the end of the strand guide 20 and between the end of the last cooling segment 30 and the kiln inlet 81 for maintenance and other reasons, which will become apparent below , desirable. However, oven 80 should tend to stick as far as possible to the End of the cooling 30 be grown, as the hot strand 1 radiates much heat especially at high temperatures.

Im Anschluss an den Ofen 80 wird der Strang 1 mittels der in der Figur 3 nicht dargestellten Schneideinrichtung 60 in Dünnbrammen geschnitten. Dass die Positionierung der Schneideinrichtung 60 auch anders möglich ist, zeigt die Figur 5a, die bis auf die Ausführung des Ofens 80 und die Position der Schneideinrichtung 60 der Anlage der Figur 3 gleicht. In der Figur 5a behält die Schneideinrichtung ihre herkömmliche Position (im Vergleich zur Anlage der Figur 1a). Dazu befindet sich die Schneideinrichtung 60 in einem Zwischenraum zwischen dem Ofen 80, der in diesem Zusammenhang auch als erster Ofen bezeichnet wird, und einem zweiten Ofen 90. Der zweite Ofen ist vollständig horizontal bzw. entlang der zweiten Richtung vorgesehen.Following the oven 80, the strand 1 by means of in the FIG. 3 not shown cutting device 60 cut into thin slabs. That the positioning of the cutting device 60 is also possible otherwise, shows the FIG. 5a , which except for the execution of the furnace 80 and the position of the cutter 60 of the plant FIG. 3 like. In the FIG. 5a the cutter maintains its conventional position (compared to the installation of the FIG. 1a ). For this purpose, the cutting device 60 is located in a space between the oven 80, which is also referred to in this context as the first oven, and a second oven 90. The second oven is provided completely horizontally or along the second direction.

Indem der Ofen 80 nach vorn verlängert und nach oben gebogen ist, kann nicht gänzlich ausgeschlossen werden, dass Restspritzwasser in den Ofen 80 eindringen kann. Aus diesem Grund ist vorzugsweise ein (nicht dargestellter) Wasserabstreifer vor dem Ofeneinlauf 81 vorgesehen. Der Wasserabstreifer kann etwa mittels eines oder mehrerer Abstreifbleche und/oder Luftdruck und/oder Wasserstrahlung und/oder mittels einer Absaugeinrichtung realisiert sein.By extending the furnace 80 forward and bending it up, it can not be completely ruled out that residual splash water can enter the furnace 80. For this reason, a water scraper (not shown) is preferably provided in front of the kiln inlet 81. The water scraper can be realized by means of one or more stripping plates and / or air pressure and / or water radiation and / or by means of a suction device.

Der Ofeneinlauf 81 ist vorzugsweise so ausgebildet, dass der Kaltstrang insbesondere beim Ausfädeln (in den Figuren nicht dargestellt) oder der Strang 1 bei einer Havarie am Ofen 80 vorbeigeführt werden kann. Dies kann durch Abschrägung des Ofeneinlaufs 81 erreicht werden, wie es in der Figur 4 gezeigt ist. Alternativ oder zusätzlich dazu ist der Ofeneinlauf 81 oder der vordere Bereich des Ofens 80 wenigstens auf der Unterseite verfahrbar ausgebildet, worunter auch eine etwaige Schwenkbewegung fällt. Unter "Kaltstrang" wird hierbei jener Strang verstanden, der vor dem Angießen in die Gießanlage eingeführt wird. Auf diesen Kaltstrang wird das flüssige Material gegossen. Der Kaltstrang dient dazu, dass das beim Gießbeginn noch flüssige Material nicht schnell durch die Kühlsegmente 30 fließt, sondern erst eine feste Strangschale ausbildet und anschließend zusammen mit dem Kaltstrang langsam durch die Sekundärkühlung 30 gezogen wird. Nach der Kühlung ist das Material durcherstarrt und kann ohne Kaltstrang weitergeführt werden. Dieser Kaltstrang soll gemäß dieser Ausführungsform vor dem Ofen 80 vom echten Strang 1 getrennt werden und senkrecht nach unten entfernt werden. Der Kaltstrang kann als Kaltstrangkette gefertigt werden.The kiln inlet 81 is preferably designed such that the cold strand can be guided past the kiln 80, in particular during removal (not shown in the figures) or the strand 1 in the event of an accident. This can be achieved by beveling the kiln inlet 81, as shown in the FIG. 4 is shown. Alternatively or additionally, the furnace inlet 81 or the front region of the furnace 80 is designed to be movable at least on the underside, which also includes any pivoting movement. By "cold strand" is meant that strand which is introduced into the casting plant before casting. On this cold strand, the liquid material is poured. The cold strand is used to ensure that the still liquid at the start of casting material is not fast through the Cooling segments 30 flows, but only forms a solid strand shell and then slowly pulled together with the dummy strand through the secondary cooling 30. After cooling, the material is solidified and can be continued without cold strand. This cold strand is to be separated according to this embodiment in front of the furnace 80 from the real strand 1 and removed vertically downwards. The cold strand can be manufactured as a cold strand chain.

Um das Einfädeln des Strangs 1 in den Ofen 80 zu unterstützen sind eine oder mehrere der Rollen 41, 51 verschiebbar vorgesehen. Insbesondere die Positionen der beiden Einlaufrollen, die mit dem Bezugszeichen 82 bezeichnet sind, sind vorzugsweise veränderbar vorgesehen. Eine derartige Verfahrbarkeit kann aber auch für andere Rollen, insbesondere die Richtrollen 51, vorgesehen sein. Der Ofen 80 muss dazu nach oben hin ausreichend Platz bieten, damit die Richtrollen 51 zur Strangführung 20 weit genug geöffnet werden können. Die Einstellung der betreffenden Rollen 41, 51 im Ofen 80, das auseinanderfahren von Rollenpaaren usw. kann mittels einer hydraulischen Steuerung realisiert werden. Um das Einfädeln von außen beobachten zu können, sind im Ofen 80 vorzugsweise eine oder mehrere hitzebeständige Kameras (nicht dargestellt) eingebaut.To assist in threading the strand 1 into the furnace 80, one or more of the rollers 41, 51 are slidably provided. In particular, the positions of the two inlet rollers, which are designated by the reference numeral 82, are preferably provided changeable. However, such movability can also be provided for other rollers, in particular the straightening rollers 51. The oven 80 must provide sufficient space to the top so that the straightening rollers 51 can be opened wide enough for strand guide 20. The adjustment of the respective rollers 41, 51 in the oven 80, the moving apart of pairs of rollers, etc. can be realized by means of a hydraulic control. In order to observe the threading from the outside, preferably one or more heat-resistant cameras (not shown) are installed in the oven 80.

Der Ofen 80, oder ein Teil davon, kann als Passivofen ausgelegt sein, der nur beim Angießen oder bei kleinen Gießgeschwindigkeiten (geringere Durchschnittstemperatur) aktiv heizt; andernfalls dient er als gute Isolation. Ob der Ofen 80 als Aktiv- oder Passivofen betrieben wird, kann individuell verschieden sein und hängt stark von den konkreten Gießbedingungen ab. Beispiele dazu werden weiter unten besprochen.The furnace 80, or part of it, may be designed as a passive furnace which will only actively heat when casting or at low casting speeds (lower average temperature); otherwise it serves as good isolation. Whether the kiln 80 is operated as an active or passive kiln can vary individually and depends heavily on the concrete casting conditions. Examples will be discussed below.

Um zu vermeiden, dass die Richtrollen 51 durch die hohen Umgebungstemperaturen beschädigt werden, werden diese vorzugsweise gekühlt. Alternativ sind die Rollen 51 aus einem hochfesten und hitzebeständigen Material gefertigt, damit keine Wärme über die Rollen 51 abgegeben wird. Diese Ausführungsbeispiele können analog für andere Rollen aus dem Biege-/Richtbereich Anwendung finden.In order to avoid that the straightening rollers 51 are damaged by the high ambient temperatures, they are preferably cooled. Alternatively, the rollers 51 are made of a high-strength and heat-resistant material, so that no heat is released through the rollers 51. These Embodiments can be used analogously for other roles from the bending / straightening area application.

Die oben eingeführte Figur 5a zeigt ein Ausführungsbeispiel, das dem der Figur 3 ähnlich ist. Statt eines Ofens 80 sind jedoch zwei Öfen 80 und 90 vorgesehen, zwischen denen die Schneideinrichtung 60 angeordnet ist.The above introduced FIG. 5a shows an embodiment that the the FIG. 3 is similar. Instead of a furnace 80, however, two furnaces 80 and 90 are provided, between which the cutting device 60 is arranged.

Im Folgenden soll eine spezielle Betriebskonfiguration dieser Anlage beschrieben werden. Ein beispielhaftes Temperaturprofil des Strangs 1 entlang der Transportrichtung ist dazu in der Figur 5b gezeigt. Die Grafik zeigt den Temperaturverlauf auf der Oberfläche des Strangs 1, im Kern und die Durchschnittstemperatur als Funktion vom Abstand, ausgehend von dem Gießspiegel an der Kokille, für einen Low-Carbon-Werkstoff mit einer Brammenabmessung von 1.600 mm x 60 mm bei einer Gießgeschwindigkeit von 5,2 m/min.In the following, a special operating configuration of this system will be described. An exemplary temperature profile of the strand 1 along the transport direction is in the FIG. 5b shown. The graph shows the temperature profile on the surface of the strand 1, in the core and the average temperature as a function of the distance, starting from the mold level of the mold, for a low-carbon material with a slab dimension of 1,600 mm x 60 mm at a casting speed of 5.2 m / min.

Gemäß diesem Beispiel wird der 60 mm dicke Strang in der CSP-Anlage mit einer metallurgischen Länge von etwa 8 m gegossen. Ein Low-Carbon-Werkstoff mit Liquidustemperatur von 1.529 °C und Solidustemperatur von 1.499 °C erstarrt bei einer Überhitzung von 25 °C nach etwa 7,4 m. Die Durchschnittstemperatur beträgt am Ende der Kühlsegmente 30 bei ca. 8 m etwa 1.250 °C und sinkt durch Strahlung und den Kontakt mit den Biegerollen 41 bis zum Ofeneinlauf 81 bei ca. 11 m auf etwa 1.200 °C ab. Der erste Ofen 80 ist in diesem Beispiel etwa 6 m lang und muss den Strang 1 bei dieser Gießgeschwindigkeit nicht aktiv erwärmen. Er muss zumindest aber vor dem ersten Guss auf 1.200 °C hochgefahren werden. Ferner ist er für geringere Gießgeschwindigkeiten oder bei dünnerem Material des Strangs 1 als Aktivofen ausgelegt. Des Weiteren wird angenommen, dass die im ersten Ofen 80 befindlichen Richtrollen 51 dem Strang 1 im Wesentlichen keine Wärme entziehen. Beim Ofenauslauf, der mit dem Bezugszeichen 84 bezeichnet ist, nach ca. 17 m hat sich die Temperatur im Strang 1 ausgeglichen und beträgt an jeder Querschnittsposition etwa 1.200 °C. Auf den nächsten 3 m kann sich die Schneideinrichtung 60 befinden. Durch die freie Wärmestrahlung und durch Rollenkontakt sinkt die Durchschnittstemperatur des Strangs 1 um ca. 50 °C auf etwa 1.150 °C ab. Der Strang 1 gelangt nun in den zweiten Ofen 90. Darin findet ein neuerlicher Temperaturausgleich statt. Hinter dem zweiten Ofen 90, der in der Regel kürzer als der erste Ofen 80 ist und im vorliegenden Beispiel eine Länge von 5 m aufweist, hat sich die Temperatur im Strang 1 erneut ggf. ohne aktives Aufheizen ausgeglichen, und der Strang 1 kann direkt in das anschließende Walzwerk einlaufen. Für geringere Temperaturen nach der Sekundärkühlung und um bei Störungen genügend Sicherheitszonen zu haben, können die Öfen 80, 90 wesentlich länger gebaut werden und die Position der Schneideinrichtung 60 könnte weiter nach hinten platziert werden.According to this example, the 60 mm thick strand is cast in the CSP plant with a metallurgical length of about 8 m. A low-carbon material with a liquidus temperature of 1,529 ° C and solidus temperature of 1,499 ° C solidifies at an overheating of 25 ° C after about 7.4 m. The average temperature at the end of the cooling segments 30 at about 8 m about 1,250 ° C and drops by radiation and the contact with the bending rollers 41 to the kiln inlet 81 at about 11 m to about 1,200 ° C from. The first furnace 80 in this example is about 6 meters long and does not need to actively heat the strand 1 at this casting speed. At least, however, it has to be raised to 1,200 ° C before the first casting. Furthermore, it is designed for lower casting speeds or thinner material of the strand 1 as an active furnace. Furthermore, it is assumed that the straightening rollers 51 located in the first oven 80 substantially remove no heat from the strand 1. When the furnace outlet, which is designated by the reference numeral 84, after about 17 m, the temperature has balanced in the strand 1 and is at each cross-sectional position about 1,200 ° C. On the next 3 m can the Cutting device 60 are located. Due to the free heat radiation and roller contact, the average temperature of the strand 1 decreases by about 50 ° C to about 1,150 ° C from. The strand 1 now passes into the second furnace 90. Therein a renewed temperature compensation takes place. Behind the second oven 90, which is usually shorter than the first oven 80 and in the present example has a length of 5 m, the temperature in the strand 1 has again compensated if necessary without active heating, and the strand 1 can directly in running in the subsequent rolling mill. For lower temperatures after secondary cooling and to have enough safety zones in case of disturbances, ovens 80, 90 can be built much longer and the position of cutter 60 could be placed farther back.

Ein alternatives Ausführungsbeispiel, das sich an die Kompaktanlage der Figur 2a anlehnt, ist in der Figur 6a gezeigt. Der Temperaturverlauf der Anlage geht aus der Figur 6b hervor. Analog zur Figur 2b zeigt die Grafik der Figur 6b den Temperaturverlauf auf der Oberfläche des Strangs 1, im Kern und die Durchschnittstemperatur als Funktion vom Abstand, ausgehend von dem Gießspiegel an der Kokille, für einen Low-Carbon-Werkstoff mit einer Brammenabmessung von 1.350 mm x 40 mm bei einer Gießgeschwindigkeit von 4 m/min. Darüber hinaus behalten der Aufbau der einzelnen Komponenten und deren Funktionen ihre Gültigkeit, und auf eine wiederholende Beschreibung wird zur Vermeidung von Redundanz verzichtet.An alternative embodiment, which relates to the compact system of FIG. 2a is in the FIG. 6a shown. The temperature course of the plant goes out of the FIG. 6b out. Analogous to FIG. 2b shows the graphic of the FIG. 6b the temperature profile on the surface of the strand 1, in the core and the average temperature as a function of the distance, starting from the casting mirror on the mold, for a low-carbon material with a slab dimension of 1,350 mm x 40 mm at a casting speed of 4 m / minute In addition, the structure of the individual components and their functions remain valid, and a repetitive description is omitted to avoid redundancy.

Alle Ausführungsbeispiele haben gemeinsam, dass die Durchschnittstemperatur des Strangs 1 zwischen dem Auslauf aus dem letzten Kühlsegment 30 bis zur Schneideinrichtung 60 weniger stark abfällt, als es etwa mit Anlagen gemäß den Figuren 1a und 2a der Fall ist. Das geht deutlich aus einem Vergleich der entsprechenden Temperaturprofile hervor.All embodiments have in common that the average temperature of the strand 1 between the outlet from the last cooling segment 30 to the cutter 60 drops less than it is about with systems according to the FIGS. 1a and 2a the case is. This is clearly evident from a comparison of the corresponding temperature profiles.

Eine positive Folge sind geringere Energiekosten. Dies wird verstärkt, wenn der Ofen 80 und/oder 90 nur vor dem Angießen und bei geringen Gießgeschwindigkeiten geheizt werden muss und ansonsten zum passiven Wärmeausgleich genutzt werden kann. Da die Temperatur nicht so stark abfällt, entstehen weniger Ausscheidungen, wodurch die Rissgefahr sinkt und die mechanischen Eigenschaften der Brammen verbessert werden. Durch die sauerstoffarme Ofenatmosphäre verringert sich das Zunderwachstum, was zu einer höheren Ausbringung führt. Insgesamt kann der Ofen kompakter und damit die Fertigungshalle kürzer gebaut werden. Die durchschnittliche Strangtemperatur ist auch beim Einbau einer Schneideinrichtung zwischen zwei Öfen 80 und 90 (ca. 3 m freie Strahlung) hoch genug für das anschließende Walzwerk.A positive consequence is lower energy costs. This is enhanced when the oven 80 and / or 90 just before casting and at low Casting speeds must be heated and otherwise can be used for passive heat balance. Since the temperature does not drop so much, less precipitates occur, which reduces the risk of cracking and improves the mechanical properties of the slabs. The low-oxygen furnace atmosphere reduces scale growth, resulting in higher output. Overall, the furnace can be made more compact and thus the production hall shorter. The average strand temperature is also high enough for the subsequent rolling mill when installing a cutting device between two ovens 80 and 90 (about 3 m free radiation).

Soweit anwendbar, können alle einzelnen Merkmale, die in den Ausführungsbeispielen dargestellt sind, miteinander kombiniert und/oder ausgetauscht werden, ohne den Bereich der Erfindung zu verlassen.Where applicable, all individual features illustrated in the embodiments may be combined and / or interchanged without departing from the scope of the invention.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Strangstrand
1010
Kokillemold
2020
Strangführungstrand guide
3030
Kühlsegmentecooling segments
4040
Biegebereichbending area
4141
Rollen des BiegebereichsRolling the bending area
5050
Richtbereichleveling range
5151
Richtrollenstraightening rollers
6060
Schneideinrichtungcutter
7070
Ofenoven
7171
Ofeneinlaufkiln inlet
8080
erster Ofenfirst oven
8181
Ofeneinlaufkiln inlet
8282
Einlaufrollenfeed rollers
8484
Ofenauslaufkiln outlet
8585
Ofenabschnitt entlang der zweiten RichtungOven section along the second direction
8686
gebogener Ofenabschnittcurved oven section
9090
zweiter Ofensecond oven
TT
Transportrichtung des Strangs bzw. der DünnbrammenTransport direction of the strand or thin slabs

Claims (12)

  1. Device for continuous casting of thin slabs with a strip guide (20), which is arranged behind a mould (10) in casting direction and which guides the strip (1), which has exited the mould (10), along a first direction, a bending/straightening region (40, 50) which is connected therewith and which comprises means for driving and bending the strip (1) in a second direction differing from the first direction, a cutting device (60) which cuts the strip (1) into thin slabs and a first furnace (80) provided for temperature equalisation in the strip (1),
    characterised in that
    the first furnace (80) extends curvilinearly at least partly over the bending/straightening region (40, 50) and in part along the second direction.
  2. Device according to claim 1, characterised in that one or more cooling segments (30) for cooling the strip (1) are provided in the region of the strip guide (20).
  3. Device according to claim 1 or 2, characterised in that the first furnace (80) is curved in a range between 10° and 80°.
  4. Device according to any one of the preceding claims, characterised in that the device is designed for casting thin slabs with a thickness between 35 millimetres and 90 millimetres, preferably 40 millimetres to 60 millimetres.
  5. Device according to any one of the preceding claims, characterised in that the cutting device (60) is arranged behind the first furnace (80).
  6. Device according to any one of the preceding claims, characterised in that a second furnace (90) is provided behind the first furnace (80) and the cutting device (60) is provided between the two furnaces.
  7. Device according to any one of the preceding claims, characterised in that the bending/straightening region (40, 50) is constructed with a bending region (40) with bending rollers (41) and a straightening region (50) with straightening rollers (51), wherein one or more of the bending rollers (41) and/or straightening rollers (51) are arranged in the first furnace (80).
  8. Device according to any one of the preceding claims, characterised in that a water stripper for removal of spray water is provided in front of the inlet (81) into the first furnace (80).
  9. Device according to any one of the preceding claims, characterised in that the region at the inlet (81) of the first furnace (80) is so formed that a strip, preferably the cold strip and/or the strip (1) in the case of an accident, can be conducted past the first furnace (80).
  10. Device according to claim 9, characterised in that the front region of the furnace (80) is constructed to movable and/or pivotable.
  11. Device according to any one of the preceding claims, characterised in that one or more heat-resistant cameras are provided in the first furnace (80).
  12. Device according to any one of the preceding claims, characterised in that one or more rollers in the bending/straightening region (40, 50) are movable.
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US20170341135A1 (en) 2017-11-30
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KR20170088386A (en) 2017-08-01
CN107107171B (en) 2020-11-13
WO2016083574A1 (en) 2016-06-02
CN107107171A (en) 2017-08-29
EP3223979A1 (en) 2017-10-04
DE102014224390A1 (en) 2016-06-02
US10610927B2 (en) 2020-04-07

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