EP3027331A1 - Casting and rolling plant and method for producing slabs - Google Patents

Casting and rolling plant and method for producing slabs

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Publication number
EP3027331A1
EP3027331A1 EP14747587.5A EP14747587A EP3027331A1 EP 3027331 A1 EP3027331 A1 EP 3027331A1 EP 14747587 A EP14747587 A EP 14747587A EP 3027331 A1 EP3027331 A1 EP 3027331A1
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EP
European Patent Office
Prior art keywords
mill
slabs
casting
steckel
cast
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14747587.5A
Other languages
German (de)
French (fr)
Other versions
EP3027331B1 (en
Inventor
Olaf Norman Jepsen
Guido Kleinschmidt
Markus Reifferscheid
Dieter Rosenthal
Jochen Wans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
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SMS Group GmbH
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Publication date
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3027331A1 publication Critical patent/EP3027331A1/en
Application granted granted Critical
Publication of EP3027331B1 publication Critical patent/EP3027331B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill

Definitions

  • the invention relates to a casting and rolling plant with a strip casting machine and a method for producing pre-strip. Specifically, the invention relates to small caster rolling mills, so-called micromill plants, for the production of flat steel with an annual production between 350,000 and 700,000 t of carbon steel.
  • the plant concept according to the invention is characterized by low investment and production costs, rapid project implementation with a short return on investment and a compact plant layout.
  • the plant according to the invention is particularly suitable for steel producers in regions where so far no flat steel production took place and where a specialization to regional requirements should take place.
  • Cast rolling with strip casting machines are known in the art in principle. A comprehensive overview of the basics of strip casting, which is still valid today, can be found in the article by Spitzer et al., Development status in the DSC strip casting process, Stahl and Eisen 121 (2001) No. 5.
  • DSC stands for Direct Strip Casting. From this article strip casting machines are known with a cooled conveyor belt and wherein the range from the steel task to hot rolling is housed, so that a protective gas atmosphere can be adjusted.
  • the casting machine described there has a casting speed of up to 60 m / min. and produces a cast strand with a casting thickness of 8 to 15 mm.
  • the strip casting machine downstream is a roller table and after the roller table follows a continuous in-line rolling. The rolling stand allows a reduction in thickness z. B. to 8 mm. After rolling, the steel strip is wound into a coil. Further state of the art casting toggle systems with strip casting found for. In DE 197 58 108 C1 or in WO 201 1/061262 A
  • WO 2010/066412 A1 discloses a casting and rolling plant with a strip casting machine.
  • the strip casting machine follows in the casting direction a roller table with a temperature homogenization zone, a temperature setting device, a mass flow control, a second temperature setting device and a rolling stand, a pair of scissors and a reel.
  • a disadvantage of this continuous in-line rolling device is that the slab in the rolling mill can only be subjected to a single pass and thus only a reduction in thickness before it is wound up as a pre-strip on the reel.
  • the invention has the object, a casting and a method for producing slabs with the help of a strip casting machine in such a way that the casting rolling mill can be made more compact and that in the manufacturing process time and energy can be saved.
  • the object is achieved by the device technology by the claimed in claim 1 casting rolling.
  • the word “G manstrang” is used for the cast product between the mold and the scissors
  • the word “slab” for the cast product between the scissors and the Steckel mill
  • the word “Vorband” for the cast product between the Steckel mill and the reel
  • the claimed system design offers the advantage that the slabs can be introduced directly into the Steckel mill downstream of the temperature homogenizer, where they can be subjected to a first pass without the slabs being wound up beforehand Pre-scaffolding is not foreseen and is not required
  • the plant can be made more compact and investment costs can be saved
  • this system concept is very energy efficient, because no appreciable temperature losses occur between the temperature homogenizer and the Steckel mill, for example, by interim storage or wrapping of coils, as is known from the prior art.
  • Both Steckel each have only one winding device and are each only designed to wind the pre-strip after a pass of the Steckel mill and for dispensing the pre-strip to the Steckel mill for the subsequent stitch.
  • the winding furnace arranged upstream is not designed to receive the slabs, for example, from the temperature homogenizing device. He has for this purpose no second winding device or no second station, which would allow the winding of the slabs from the temperature homogenizer and which would further allow the implementation of the coils thus produced for feeding the slabs to the Steckel mill.
  • the shears for dividing the cast strand cast by the casting machine into slabs of predetermined length may be disposed between the multi-roll smoother and the entrance of the temperature homogenizer or between the exit of the temperature homogenizer and the Steckel mill.
  • an induction heating device is preferably arranged for heating the slabs to a temperature suitable for the Steckel rollers.
  • the above object of the invention is further achieved by the method claimed in claim 9.
  • the advantages of this process solution correspond to the advantages mentioned above with respect to the claimed cast roll mill.
  • the method provides that the casting strand with a casting belt speed of 5 to 25 m / min. is poured.
  • the method according to the invention and the associated cast roll plant according to the invention are in particular provided for producing carbon steel pre-strips.
  • the invention is a total of 2 figures attached, wherein
  • FIG. 1 shows the cast roll mill according to the invention
  • FIG. 2 shows the strip casting machine according to the invention in detail.
  • FIG. 1 shows the casting and rolling plant 100 according to the invention. It comprises a melt feeding system 105, a strip casting machine 10, a multi-roll smoothing device 120, a shear 130, a temperature homogenizing furnace 140, optionally an induction heating device 150, a roller table 155, a Steckel rolling mill 160, a cooling section 170 and, for example, a reeling device 180.
  • the melt delivery system 105 consists essentially of a refractory lined or separately dumped position Heatable melt container, which the liquid metal, ie the melt, via a discharge nozzle using gravity on the conveyor belt 1 18, see Figure 2, the strip casting machine 1 10 performs.
  • a fill level measuring system ensures a constant melt level in the melt container and thus a constant flow of melt to the strip casting machine 10.
  • the distribution of the melt over the casting width takes place via flow guidance elements (not shown in FIG. 1) in the melt delivery system 105 or via arranged guide systems. These guide systems can conduct the melt with the aid of electromagnetic traveling fields or by the use of gas, which is passed through nozzles on the melt surface. The combination of several melt container with each other is possible.
  • the flow guidance elements also extend beyond the melt delivery system into the region of the circulating conveyor belt 1 18 of the strip casting machine 10.
  • the strip casting machine 10 as shown in FIG. 2, consists essentially of the optionally textured or coated transport belt 1 18 revolving around three rollers.
  • the transport belt 118 is preferably made of steel with a thickness of less than 3 mm.
  • the smaller of the three rollers 1 15 shown in Figure 2 ensures a uniform tension of the tape.
  • the laterally delimiting the strip caster take over two horizontally encircling water-cooled dam block chains, not shown in FIG.
  • the conveyor belt is cooled from below via spray nozzles, also not shown in FIG. 2, in the melt feed region with specific water-loading densities between 80 and 300 l / s / m 2 .
  • the spray-cooling container which is arranged almost airtight beneath the belt and comprises the rollers 15 and support grids, the belt cooling is operated with preferably> 100 m / bar negative pressure.
  • the outside prevailing air pressure thus ensures the flat pressing of the metal strip on the support means between the two large rollers 1 15th
  • the strip casting machine 1 10 according to the invention has a strip contact length of less than 7.5 m, wherein the strip contact length is measured as the distance between the centers of the two large rollers 1 15.
  • the realized with the strip casting machine 1 10 casting speeds are, depending on the casting thickness between 5 and 25 m / min.
  • the strip casting machine 1 10 is the Multirollenglätt issued 120 downstream in the casting direction R.
  • the multi-roll smoothing device 120 the cast strand is guided to improve its flatness with at least three pairs of rolls 124.
  • the pairs of rollers are preferably driven individually. A reduction in the thickness of the casting strand generally does not take place in the multi-roll smoothing device.
  • the example subsequent scissors 130 cuts the cast strand in slabs of predetermined length and decouples the previous casting process from a subsequent rolling process.
  • the temperature homogenizer 140 is arranged, which is typically designed as a tunnel furnace.
  • the inductive heating downstream of the furnace which is provided only as an option, optionally provides for an increase in the temperature of the slabs and / or for a temperature compensation over the length of the slab before the slabs enter the downstream Steckel mill (160).
  • the Steckel mill produces the desired final thickness with three, five, seven or more passes.
  • the Steckel mill (160) is followed, as already mentioned above, in the casting direction by the cooling section 170 and the reel 180 for winding the pre-strips into a collar 250.
  • the casting roll plant according to the invention thus formed has the advantage that the slabs, after passing through the temperature homogenizing device 140, are transported directly into the Steckel mill 160, substantially without loss of time and energy or heat loss Perform a first pass without having to be wound up first.
  • the induction heater 150 and / or the scissors 130 are arranged between the temperature homogenizer 140 and the Steckel mill 160.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

The invention relates to a casting and rolling plant having a strip-casting machine and to a method for producing near-net strips. In addition to the strip-casting machine for casting a cast strand, the casting and rolling plant comprises shears 130 for separating the cast strand into slabs of predetermined length, a temperature-homogenization device 140 and also a Steckel rolling mill to roll the slabs to form near-net strips with a predetermined thickness. In order to make it possible to construct the casting and rolling plant in more compact form and at the same time to make it possible for the production method to be more economical in terms of time and energy, the invention proposes that a multi-roller smoothing device 120 is arranged between the output of the strip-casting machine 110 and the temperature-homogenization device 140 in the casting and rolling plant, and that a roller table is provided between the output of the temperature-homogenization device and the Steckel rolling mill to feed the slabs directly into the Steckel rolling mill (160).

Description

Gießwalzanlage und Verfahren zum Herstellen von Brammen  Cast rolling mill and method for producing slabs
Die Erfindung betrifft eine Gießwalzanlage mit einer Bandgießmaschine und ein Verfahren zum Herstellen von Vorband. Konkret betrifft die Erfindung kleine Gießwalzanlagen, sogenannte Micromillanlagen, zur Herstellung von Flachstahl mit einer Jahresproduktion zwischen 350.000 und 700.000 t Kohlenstoffstahl. Das erfindungsgemäße Anlagenkonzept zeichnet sich aus durch geringe Investitionsund Produktionskosten, eine schnelle Projektrealisierung mit kurzem Return on Invest und durch ein kompaktes Anlagenlayout. Die erfindungsgemäße Anlage eignet sich besonders für Stahlerzeuger in Regionen, wo bisher keine Flachstahlerzeugung stattfand und wo eine Spezialisierung auf regionale Anforderungen erfolgen soll. The invention relates to a casting and rolling plant with a strip casting machine and a method for producing pre-strip. Specifically, the invention relates to small caster rolling mills, so-called micromill plants, for the production of flat steel with an annual production between 350,000 and 700,000 t of carbon steel. The plant concept according to the invention is characterized by low investment and production costs, rapid project implementation with a short return on investment and a compact plant layout. The plant according to the invention is particularly suitable for steel producers in regions where so far no flat steel production took place and where a specialization to regional requirements should take place.
Gießwalzanlagen mit Bandgießmaschinen sind im Stand der Technik grundsätzlich bekannt. Einen auch heute noch gültigen umfassenden Überblick über die Grundlagen des Bandgießens gibt der Artikel von Spitzer et al., Entwicklungsstand beim DSC-Bandgießverfahren, Stahl und Eisen 121 (2001 ) Nr. 5. DSC steht für Direct Strip Casting. Aus diesem Artikel sind Bandgießmaschinen bekannt mit einem gekühlten Transportband und wobei der Bereich von der Stahlaufgabe bis zum Warmwalzen eingehaust ist, so dass eine Schutzgasatmosphäre eingestellt werden kann. Die dort beschriebene Gießmaschine weist eine Gießgeschwindigkeit von bis zu 60 m/min. auf und erzeugt einen Gießstrang mit einer Gießdicke von 8 bis 15 mm. Der Bandgießmaschine nachgeschaltet ist ein Rollgang und nach dem Rollgang folgt ein kontinuierliches In-Line-Walzen. Das Walzgerüst ermöglicht eine Dickenreduktion z. B. auf 8 mm. Nach dem Walzen wird das Stahlband zu einem Coil aufgewickelt. Weiterer Stand der Technik zu Gießwalzanlagen mit Bandgießmaschinen findet sich z. B. in der DE 197 58 108 C1 oder in der WO 201 1/061262 A1 . Cast rolling with strip casting machines are known in the art in principle. A comprehensive overview of the basics of strip casting, which is still valid today, can be found in the article by Spitzer et al., Development status in the DSC strip casting process, Stahl and Eisen 121 (2001) No. 5. DSC stands for Direct Strip Casting. From this article strip casting machines are known with a cooled conveyor belt and wherein the range from the steel task to hot rolling is housed, so that a protective gas atmosphere can be adjusted. The casting machine described there has a casting speed of up to 60 m / min. and produces a cast strand with a casting thickness of 8 to 15 mm. The strip casting machine downstream is a roller table and after the roller table follows a continuous in-line rolling. The rolling stand allows a reduction in thickness z. B. to 8 mm. After rolling, the steel strip is wound into a coil. Further state of the art casting toggle systems with strip casting found for. In DE 197 58 108 C1 or in WO 201 1/061262 A1.
Gleichermaßen offenbart die WO 2010/066412 A1 eine Gießwalzanlage mit einer Bandgießmaschine. Der Bandgießmaschine folgt in Gießrichtung ein Rollgang mit einer Temperatur-Homogenisierungszone, eine Temperatur-Einstelleinrichtung, eine Massenstromregelung, eine zweite Temperatur-Einstelleinrichtung sowie ein Walzgerüst, eine Schere und einen Haspel. Nachteilig an dieser kontinuierlichen In-Line-Walzeinrichtung ist, dass die Bramme in dem Walzgerüst lediglich nur einem Stich und damit nur einer Dickenreduktion unterzogen werden kann, bevor sie als Vorband auf dem Haspel aufgewickelt wird. Similarly, WO 2010/066412 A1 discloses a casting and rolling plant with a strip casting machine. The strip casting machine follows in the casting direction a roller table with a temperature homogenization zone, a temperature setting device, a mass flow control, a second temperature setting device and a rolling stand, a pair of scissors and a reel. A disadvantage of this continuous in-line rolling device is that the slab in the rolling mill can only be subjected to a single pass and thus only a reduction in thickness before it is wound up as a pre-strip on the reel.
Ein alternatives Anlagenkonzept mit einer Bandgießmaschine ist aus der europäischen Patentschrift EP 1 827 720 B1 bekannt. Konkret offenbart diese Patentschrift eine Gießwalzanlage, bei welcher nach der Bandgießmaschine eine Temperatur-Homogenisierungseinrichtung, ein Vorgerüst, eine Schere und eine erste Aufwickeleinrichtung in Gießrichtung folgen. Zur weiteren Dickenreduktion ist in Gießrichtung nachgeschaltet ein Steckelwalzwerk vorgesehen sowie dem Steckelwalzwerk nachfolgend eine Kühlstrecke sowie schließlich eine Haspeleinrichtung. Zum Betrieb des Steckelwalzwerks ist es erforderlich, dass die mit Hilfe der ersten Aufwickeleinrichtung erzeugten Coils in einem stromaufwärts des Steckelwalzwerks befindlichen ersten Wickelofen umgesetzt werden bevor das Metallband des Coils erstmals das Steckelwalzwerk für einen ersten Stich durchlaufen kann. Das Umsetzen der Coils bzw. Metallbänder ermöglicht zwar eine Zwischenspeicherung der Coils bzw. Metallbänder in einem Lager; durch diese Unterbrechung des Gieß-Walz-Prozesses geht jedoch Zeit und Energie verloren, letzteres insbesondere weil die Coils vor dem Einlaufen in das Steckelwalzwerk eventuell nochmals in dem Wickelofen erwärmt werden müssen. Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Gießwalzanlage und ein Verfahren zum Herstellen von Brammen mit Hilfe einer Bandgießmaschine derart weiterzubilden, dass die Gießwalzanlage kompakter gebaut werden kann und dass bei dem Herstellungs-Verfahren Zeit und Energie eingespart werden können. Die Aufgabe wird vorrichtungstechnisch durch die in Patentanspruch 1 beanspruchte Gießwalzanlage gelöst. Diese ist dadurch gekennzeichnet, dass zwischen dem Ausgang der Bandgießmaschine und der Temperatur- Homogenisierungseinrichtung eine Multirollenglätteinrichtung angeordnet ist und dass ein Rollgang vorgesehen ist zwischen dem Ausgang der Temperatur- Homogenisierungseinrichtung und dem Steckelwalzwerk zum Zuführen der Brammen direkt in das Steckelwalzwerk. An alternative plant concept with a strip casting machine is known from the European patent EP 1 827 720 B1. Specifically, this patent discloses a caster in which follow after the strip casting a temperature homogenizer, a roughing stand, a pair of scissors and a first take-up device in the casting direction. To further reduce the thickness downstream of a Steckel mill is provided in the casting direction and the Steckel rolling mill below a cooling section and finally a coiler. To operate the Steckel mill, it is necessary that the coils produced by means of the first coiler be implemented in a first winding furnace located upstream of the Steckel mill before the metal strip of the coil can first pass through the Steckel mill for a first pass. Although the implementation of the coils or metal strips allows a temporary storage of coils or metal strips in a warehouse; However, this interruption of the casting-rolling process time and energy is lost, the latter in particular because the coils may need to be reheated in the winding furnace before entering the Steckel mill. Based on this prior art, the invention has the object, a casting and a method for producing slabs with the help of a strip casting machine in such a way that the casting rolling mill can be made more compact and that in the manufacturing process time and energy can be saved. The object is achieved by the device technology by the claimed in claim 1 casting rolling. This is characterized in that a Multirollenglätteinrichtung is arranged between the output of the strip casting machine and the temperature homogenizer and that a roller table is provided between the output of the temperature homogenizer and the Steckel mill for feeding the slabs directly into the Steckel mill.
Im Rahmen der vorliegenden Beschreibung wird das Wort„Gießstrang" für das Gießprodukt zwischen Kokille und Schere, das Wort „Bramme" für das Gießprodukt zwischen Schere und Steckelwalzwerk und das Wort„Vorband" für das Gießprodukt zwischen Steckelwalzwerk und Haspel verwendet. Brammen entstehen durch Zerteilen des Gießstrangs; Vorbänder entstehen durch Dickenreduktion der Brammen mit mindestens einem Stich. Das beanspruchte Anlagenkonzept bietet den Vorteil, dass hinter der Temperatur- Homogenisierungseinrichtung die Brammen direkt in das Steckelwalzwerk eingeführt und dort einem ersten Stich unterzogen werden können, ohne dass zuvor ein Aufwickeln der Brammen erforderlich wäre. Ein Vorgerüst ist nicht vorgesehen und nicht erforderlich. Durch das Einsparen des Vorgerüstes und einer Aufwickeleinrichtung zum Aufwickeln der Brammen aus der Temperatur- Homogenisierungseinrichtung kann die Anlage kompakter gebaut werden und Investitionskosten können eingespart werden. Außerdem ist dieses Anlagenkonzept sehr energieeffizient, weil zwischen der Temperatur- Homogenisierungseinrichtung und dem Steckelwalzwerk keine nennenswerten Temperatur-Verluste entstehen, etwa durch ein Zwischenlagern oder Umhängen von Coils, wie dies aus dem Stand der Technik bekannt ist. Gemäß einem ersten Ausführungsbeispiel der Erfindung sind dem Steckwalzwerk stromaufwärts und stromabwärts, jeweils auf die Gießrichtung bezogen, Wickelöfen, sogenannte Steckel, zugeordnet. Beide Steckel weisen jeweils nur eine Wickeleinrichtung auf und sind jeweils auch nur ausgebildet zum Aufwickeln des Vorbandes nach einem Stich des Steckelwalzwerks und zum Abgeben des Vorbandes an das Steckelwalzwerk für den nachfolgenden Stich. Insbesondere der stromaufwärts angeordnete Wickelofen ist nicht dazu ausgebildet, die Brammen z.B. aus der Temperatur-Homogenisierungseinrichtung aufzunehmen. Er weist zu diesem Zweck keine zweite Wickeleinrichtung bzw. keine zweite Station auf, welche das Aufwickeln der Brammen aus der Temperatur- Homogenisierungseinrichtung ermöglichen würde und welche weiterhin das Umsetzen des so erzeugten Coils ermöglichen würde zum Zuführen der Brammen zu dem Steckelwalzwerk. In the context of the present description, the word "Gießstrang" is used for the cast product between the mold and the scissors, the word "slab" for the cast product between the scissors and the Steckel mill and the word "Vorband" for the cast product between the Steckel mill and the reel The claimed system design offers the advantage that the slabs can be introduced directly into the Steckel mill downstream of the temperature homogenizer, where they can be subjected to a first pass without the slabs being wound up beforehand Pre-scaffolding is not foreseen and is not required By saving the roughing stand and a take-up device for winding the slabs from the temperature homogenizer, the plant can be made more compact and investment costs can be saved In addition, this system concept is very energy efficient, because no appreciable temperature losses occur between the temperature homogenizer and the Steckel mill, for example, by interim storage or wrapping of coils, as is known from the prior art. According to a first embodiment of the invention, the Steckwalzwerk upstream and downstream, in each case based on the casting direction, winding furnaces, so-called Steckel assigned. Both Steckel each have only one winding device and are each only designed to wind the pre-strip after a pass of the Steckel mill and for dispensing the pre-strip to the Steckel mill for the subsequent stitch. In particular, the winding furnace arranged upstream is not designed to receive the slabs, for example, from the temperature homogenizing device. He has for this purpose no second winding device or no second station, which would allow the winding of the slabs from the temperature homogenizer and which would further allow the implementation of the coils thus produced for feeding the slabs to the Steckel mill.
Die Schere zum Zerteilen des von der Gießmaschine gegossenen Gießstrangs in Brammen vorbestimmter Länge kann zwischen der Multirollenglätteinrichtung und dem Eingang der Temperatur-Homogenisierungseinrichtung oder zwischen dem Ausgang der Temperatur-Homogenisierungseinrichtung und dem Steckelwalzwerk angeordnet sein. The shears for dividing the cast strand cast by the casting machine into slabs of predetermined length may be disposed between the multi-roll smoother and the entrance of the temperature homogenizer or between the exit of the temperature homogenizer and the Steckel mill.
Zwischen dem Ausgang der Temperatur-Homogenisierungseinrichtung und dem Steckelwalzwerk ist vorzugsweise eine Induktionsheizeinrichtung angeordnet zum Aufheizen der Brammen auf eine für das Steckelwalzen geeignete Temperatur. Between the output of the temperature homogenizer and the Steckel mill, an induction heating device is preferably arranged for heating the slabs to a temperature suitable for the Steckel rollers.
Die oben genannte Aufgabe der Erfindung wird weiterhin durch das in Patentanspruch 9 beanspruchte Verfahren gelöst. Die Vorteile dieser verfahrenstechnischen Lösung entsprechen den oben in Bezug auf die beanspruchte Gießwalzanlage genannten Vorteilen. Das Verfahren sieht vor, dass der Gießstrang mit einer Gießbandgeschwindigkeit von 5 bis 25 m/min. gegossen wird. Das erfindungsgemäße Verfahren und die zugehörige erfindungsgemäße Gießwalzanlage sind insbesondere vorgesehen zum Erzeugen von Vorbändern aus Kohlenstoffstahl. The above object of the invention is further achieved by the method claimed in claim 9. The advantages of this process solution correspond to the advantages mentioned above with respect to the claimed cast roll mill. The method provides that the casting strand with a casting belt speed of 5 to 25 m / min. is poured. The method according to the invention and the associated cast roll plant according to the invention are in particular provided for producing carbon steel pre-strips.
Weitere vorteilhafte Ausgestaltungen der beanspruchten Gießwalzanlage und des beanspruchten Verfahrens sind Gegenstand der abhängigen Ansprüche. Further advantageous embodiments of the claimed casting and the claimed method are the subject of the dependent claims.
Der Erfindung sind insgesamt 2 Figuren beigefügt, wobei The invention is a total of 2 figures attached, wherein
Figur 1 die erfindungsgemäße Gießwalzanlage; und Figur 2 die erfindungsgemäße Bandgießmaschine im Detail zeigt. FIG. 1 shows the cast roll mill according to the invention; and FIG. 2 shows the strip casting machine according to the invention in detail.
Die Erfindung wird nachfolgend unter Bezugnahme auf die genannten Figuren in Form von Ausführungsbeispielen detailliert beschrieben. In beiden Figuren sind gleiche technische Elemente mit gleichen Bezugszeichen bezeichnet. The invention will be described in detail below with reference to the said figures in the form of embodiments. In both figures, the same technical elements are designated by the same reference numerals.
Figur 1 zeigt die erfindungsgemäße Gießwalzanlage 100. Sie umfasst, in Gießrichtung R gesehen, ein Schmelzenaufgabesystem 105, eine Bandgießmaschine 1 10, eine Multirollenglätteinrichtung 120, eine Schere 130, einen Temperatur-Homogenisierungsofen 140, optional eine Induktionsheizeinrichtung 150, einen Rollgang 155, ein Steckelwalzwerk 160, eine Kühlstrecke 170 sowie beispielsweise eine Haspeleinrichtung 180. Nachfolgend werden die einzelnen Komponenten der Gießwalzanlage zumindest teilweise näher beschrieben. Das Schmelzenaufgabesystem 105 besteht im Wesentlichen aus einem mit Feuerfestmaterial ausgemauerten separat bzw. in weggekippter Position aufheizbaren Schmelzenbehälter, welcher das Flüssigmetall, d. h. die Schmelze, über eine Auslaufdüse unter Nutzung der Schwerkraft auf das Transportband 1 18, siehe Figur 2, der Bandgießmaschine 1 10 führt. Ein Füllstandsmesssystem, in Figur 1 nicht dargestellt, stellt in dem Schmelzenbehälter einen konstanten Schmelzenspiegel und damit einen konstanten Schmelzenfluss auf die Bandgießmaschine 1 10 sicher. Die Verteilung der Schmelze über der Gießbreite erfolgt über Strömungsführungselemente (in Figur 1 nicht gezeigt) im Schmelzenaufgabesystem 105 bzw. über angeordnete Führungssysteme. Diese Führungssysteme können die Schmelze unter Zuhilfenahme elektromagnetischer Wanderfelder oder durch die Verwendung von Gas führen, welches durch Düsen auf die Schmelzenoberfläche geleitet wird. Die Kombination mehrerer Schmelzenbehälter miteinander ist möglich. Die Strömungsführungselemente erstrecken sich auch über das Schmelzenaufgabesystem hinaus bis in den Bereich des umlaufenden Transportbands 1 18 der Bandgießmaschine 1 10. FIG. 1 shows the casting and rolling plant 100 according to the invention. It comprises a melt feeding system 105, a strip casting machine 10, a multi-roll smoothing device 120, a shear 130, a temperature homogenizing furnace 140, optionally an induction heating device 150, a roller table 155, a Steckel rolling mill 160, a cooling section 170 and, for example, a reeling device 180. Below, the individual components of the cast rolling mill will be described at least partially in detail. The melt delivery system 105 consists essentially of a refractory lined or separately dumped position Heatable melt container, which the liquid metal, ie the melt, via a discharge nozzle using gravity on the conveyor belt 1 18, see Figure 2, the strip casting machine 1 10 performs. A fill level measuring system, not shown in FIG. 1, ensures a constant melt level in the melt container and thus a constant flow of melt to the strip casting machine 10. The distribution of the melt over the casting width takes place via flow guidance elements (not shown in FIG. 1) in the melt delivery system 105 or via arranged guide systems. These guide systems can conduct the melt with the aid of electromagnetic traveling fields or by the use of gas, which is passed through nozzles on the melt surface. The combination of several melt container with each other is possible. The flow guidance elements also extend beyond the melt delivery system into the region of the circulating conveyor belt 1 18 of the strip casting machine 10.
Die Bandgießmaschine 1 10 besteht, wie in Figur 2 gezeigt, im Wesentlichen aus dem um drei Rollen umlaufenden, gegebenenfalls texturierten bzw. beschichteten Transportband 1 18. Das Transportband 1 18 ist bevorzugt aus Stahl mit einer Dicke von weniger als 3 mm gefertigt. Die in Figur 2 gezeigte kleinere der drei Rollen 1 15 sorgt für eine gleichmäßige Spannung des Bandes. Die seitlich Begrenzung der Bandgießanlage übernehmen zwei horizontal umlaufende wassergekühlte Dammblockketten, in Figur 2 nicht gezeigt. Das Transportband wird von unten über Spritzdüsen, in Figur 2 ebenfalls nicht gezeigt, im Schmelzenaufgabebereich mit spezifischen Wasserbeaufschlagungsdichten zwischen 80 und 300 l/s/m2 gekühlt. Bis zum Bandauslauf werden die Wasserbeaufschlagungsdichten auf Werte zwischen 10 und 100 Liter/sec/m2 zurückgeführt. Durch den unterhalb des Bandes nahezu luftdicht angeordneten Sprühkühlungsbehälter, welcher die Rollen 1 15 und Stützgitter umfasst, wird die Bandkühlung mit vorzugsweise > 100 m/bar Unterdruck betrieben. Der außen vorherrschende Luftdruck sorgt somit für das flächige Andrücken des Metallbandes auf die Stützeinrichtungen zwischen den beiden großen Rollen 1 15. Die erfindungsgemäße Bandgießmaschine 1 10 besitzt eine Bandkontaktlänge von weniger als 7,5 m, wobei die Bandkontaktlänge gemessen wird als Abstand der Mittelpunkte der beiden großen Rollen 1 15. Die mit der Bandgießmaschine 1 10 realisierten Gießgeschwindigkeiten liegen, je nach Gießdicke zwischen 5 und 25 m/min. The strip casting machine 10, as shown in FIG. 2, consists essentially of the optionally textured or coated transport belt 1 18 revolving around three rollers. The transport belt 118 is preferably made of steel with a thickness of less than 3 mm. The smaller of the three rollers 1 15 shown in Figure 2 ensures a uniform tension of the tape. The laterally delimiting the strip caster take over two horizontally encircling water-cooled dam block chains, not shown in FIG. The conveyor belt is cooled from below via spray nozzles, also not shown in FIG. 2, in the melt feed region with specific water-loading densities between 80 and 300 l / s / m 2 . Until the belt outlet the Wasserbeaufschlagungsdichten be returned to values between 10 and 100 liters / sec / m 2 . By virtue of the spray-cooling container, which is arranged almost airtight beneath the belt and comprises the rollers 15 and support grids, the belt cooling is operated with preferably> 100 m / bar negative pressure. The outside prevailing air pressure thus ensures the flat pressing of the metal strip on the support means between the two large rollers 1 15th The strip casting machine 1 10 according to the invention has a strip contact length of less than 7.5 m, wherein the strip contact length is measured as the distance between the centers of the two large rollers 1 15. The realized with the strip casting machine 1 10 casting speeds are, depending on the casting thickness between 5 and 25 m / min.
Der Bandgießmaschine 1 10 ist die Multirollenglätteinrichtung 120 in Gießrichtung R nachgeordnet. In der Multirollenglätteinrichtung 120 wird der Gießstrang zur Verbesserung seiner Planheit mit mindestens drei Rollenpaaren 124 geführt. Die Rollenpaare sind bevorzugt einzeln angetrieben. Eine Dickenreduktion des Gießstranges findet in der Multirollenglätteinrichtung grundsätzlich nicht statt. The strip casting machine 1 10 is the Multirollenglätteinrichtung 120 downstream in the casting direction R. In the multi-roll smoothing device 120, the cast strand is guided to improve its flatness with at least three pairs of rolls 124. The pairs of rollers are preferably driven individually. A reduction in the thickness of the casting strand generally does not take place in the multi-roll smoothing device.
Die beispielsweise anschließende Schere 130 schneidet den Gießstrang in Brammen vorgegebener Länge und entkoppelt den bisher erfolgten Gießprozess von einem nachfolgenden Walzprozess. The example subsequent scissors 130 cuts the cast strand in slabs of predetermined length and decouples the previous casting process from a subsequent rolling process.
In Gießrichtung R hinter der Multirollenglätteinrichtung 120, vorzugsweise auch hinter der Schere 120, ist die Temperatur-Homogenisierungseinrichtung 140 angeordnet, welche typischerweise als Tunnelofen ausgebildet ist. Die dem Ofen nachgeschaltete induktive Heizung, welche lediglich optional vorgesehen ist, sorgt gegebenenfalls für eine Erhöhung der Temperatur der Brammen und/oder für einen Temperaturausgleich über der Brammenlänge vor Einlauf der Brammen in das nachfolgende Steckelwalzwerk (160). Das Steckelwalzwerk erzeugt mit drei, fünf, sieben oder mehr Stichen die gewünschte Enddicke. Dem Steckelwalzwerk (160) folgen, wie oben bereits erwähnt, in Gießrichtung die Kühlstrecke 170 und der Haspel 180 zum Aufwickeln der Vorbänder zu einem Bund 250. In the casting direction R behind the multi-roll smoothing device 120, preferably also behind the shear 120, the temperature homogenizer 140 is arranged, which is typically designed as a tunnel furnace. The inductive heating downstream of the furnace, which is provided only as an option, optionally provides for an increase in the temperature of the slabs and / or for a temperature compensation over the length of the slab before the slabs enter the downstream Steckel mill (160). The Steckel mill produces the desired final thickness with three, five, seven or more passes. The Steckel mill (160) is followed, as already mentioned above, in the casting direction by the cooling section 170 and the reel 180 for winding the pre-strips into a collar 250.
Verfahrenstechnisch bietet die so ausgebildete erfindungsgemäße Gießwalzanlage den Vorteil, dass die Brammen nach Durchlaufen der Temperatur-Homogenisierungseinrichtung 140 im Wesentlichen ohne Zeit- und Energieverlust, bzw. ohne Wärmeverlust, direkt in das Steckelwalzwerk 160 zur Durchführung eines ersten Stichs einlaufen können, ohne zuvor aufgewickelt werden zu müssen. Allenfalls ist zwischen der Temperatur- Homogenisierungseinrichtung 140 und dem Steckelwalzwerk 160 noch die Induktionsheizung 150 und/oder die Schere 130 angeordnet. From a process engineering point of view, the casting roll plant according to the invention thus formed has the advantage that the slabs, after passing through the temperature homogenizing device 140, are transported directly into the Steckel mill 160, substantially without loss of time and energy or heat loss Perform a first pass without having to be wound up first. At most, the induction heater 150 and / or the scissors 130 are arranged between the temperature homogenizer 140 and the Steckel mill 160.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
100 Gießwalzanlage 100 cast rolling mill
105 Schmelzenaufgabensystem  105 melt task system
1 10 Bandgießmaschine  1 10 strip casting machine
1 15 große Rollen  1 15 big rolls
1 18 beschichtetes Transportband  1 18 coated conveyor belt
120 Multirollenglätteinrichtung  120 multi-roll smoothing device
124 drei Rollenpaare  124 three pairs of rolls
130 Schere  130 scissors
140 Temperatur-Homogenisierungseinrichtung 140 temperature homogenizer
150 Induktionsheizeinrichtung 150 induction heating
155 Rollgang  155 roller table
160 Steckelwalzwerk  160 Steckel mill
162 Wickelofen  162 winding furnace
164 Wickelofen  164 winding furnace
170 Kühlstrecke  170 cooling section
180 Haspeleinrichtung  180 reel device
200 Gießstrang  200 cast strand
210 Bramme  210 slabs
220 Vorband  220 opening band
250 Bund  250 francs
R Gießrichtung  R casting direction

Claims

Patentansprüche 1 . Gießwalzanlage (100) mit Claims 1. Casting mill (100) with
einer Bandgießmaschine (1 10) zum Gießen eines Gießstranges (200); einer Schere (130) zum Zerteilen des Gießstranges in Brammen (210) vorbestimmter Länge;  a strip casting machine (110) for casting a cast strand (200); a pair of scissors (130) for cutting the cast strand into slabs (210) of predetermined length;
einer Temperatur-Homogenisierungseinrichtung (140); und  a temperature homogenizer (140); and
einem Steckelwalzwerk(160) zum Walzen der Brammen zu Vorbändern a Steckel mill (160) for rolling the slabs to Vorbändern
(220) vorbestimmter Dicke; (220) of predetermined thickness;
dadurch gekennzeichnet,  characterized,
dass zwischen dem Ausgang der Bandgießmaschine (1 10) und der Temperatur-Homogenisierungseinrichtung (140) eine  that between the output of the strip casting machine (1 10) and the temperature homogenizer (140) a
Multirollenglätteinrichtung (120) angeordnet ist; und  Multi-roll smoother (120) is arranged; and
dass zwischen dem Ausgang der Temperatur- Homogenisierungseinrichtung und dem Steckelwalzwerk ein Rollgang vorgesehen ist zum Zuführen der Brammen direkt in das Steckelwalzwerk (160).  that a roller table is provided between the outlet of the temperature homogenizer and the Steckel mill for feeding the slabs directly into the Steckel mill (160).
2. Gießwalzanlage (100) nach Anspruch 1 , 2. Cast rolling mill (100) according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
die dem Steckelwalzwerk (160) stromaufwärts und stromabwärts zugeordneten Wickelöfen (162, 164) jeweils nur eine Wickeleinrichtung aufweisen und jeweils nur ausgebildet sind zum Aufwickeln des Vorbandes aus dem Steckelwalzwerk (160) und zum Abgeben des Vorbandes an das Steckelwalzwerk.  the Steckel rolling mill (160) upstream and downstream winding furnaces (162, 164) each have only one winding device and are each only designed to wind the Vorbandes from the Steckel mill (160) and for discharging the Vorbandes to the Steckel mill.
Gießwalzanlage (100) nach einem der vorangegangenen Ansprüche; dadurch gekennzeichnet, dass Casting rolling mill (100) according to one of the preceding claims; characterized in that
zwischen dem Ausgang der Temperatur-Homogenisierungseinrichtung (140) und dem Steckelwalzwerk (160) eine Induktionsheizeinrichtung (150) angeordnet ist. between the outlet of the temperature homogenizer (140) and the Steckel rolling mill (160) an induction heating device (150) is arranged.
4. Gießwalzanlage (100) nach einem der vorangegangenen Ansprüche, 4. Cast rolling mill (100) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
die Multirollenglätteinrichtung (120) mindestens 3 Rollenpaare (124) aufweist, von denen zumindest ein Rollenpaar angetrieben ist.  the multi-roll smoothing device (120) has at least 3 pairs of rolls (124), of which at least one pair of rolls is driven.
5. Gießwalzanlage (100) nach einem der vorangegangenen Ansprüche, 5. Cast rolling mill (100) according to one of the preceding claims,
gekennzeichnet durch  marked by
eine Kühlstrecke (170) stromabwärts des Steckelwalzwerks.  a cooling section (170) downstream of the Steckel mill.
6. Gießwalzanlage (100) nach Anspruch 5, 6. Cast rolling mill (100) according to claim 5,
gekennzeichnet durch  marked by
eine Haspeleinrichtung (180) stromabwärts der Kühlstrecke (170).  a reeling device (180) downstream of the cooling section (170).
7. Gießwalzanlage (100) nach einem der vorangegangenen Ansprüche, 7. Cast rolling mill (100) according to one of the preceding claims,
dadurch gekennzeichnet,  characterized,
dass die Bandgießmaschine (1 10) eine Bandkontaktlänge von kleiner 7,5m aufweist.  the strip casting machine (110) has a strip contact length of less than 7.5 m.
8. Gießwalzanlage (100) nach einem der vorangegangenen Ansprüche, 8. Cast rolling mill (100) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
die Schere (130) zum Zerteilen des Gießstranges in Brammen  the shears (130) for cutting the cast strand into slabs
vorbestimmter Länge zwischen der Multirollenglätteinrichtung (120) und dem Eingang der Temperatur-Homogenisierungseinrichtung (140) oder zwischen dem Ausgang der Temperatur-Homogenisierungseinrichtung (140) und dem Steckelwalzwerk (160) angeordnet ist.  predetermined length between the Multirollerglätteinrichtung (120) and the input of the temperature homogenizer (140) or between the output of the temperature homogenizer (140) and the Steckelwalzwerk (160) is arranged.
9. Verfahren zum Herstellen von Brammen mit folgenden Schritten: 9. Method for producing slabs with the following steps:
Herstellen eines Gießstranges (200) durch Bandgießen; Homogenisieren der Temperatur des Gießstranges (200); Producing a cast strand (200) by tape casting; Homogenizing the temperature of the cast strand (200);
Zerteilen des Gießstranges vor oder nach dem Homogenisieren in  Splitting the cast strand before or after homogenizing in
Brammen;  slabs;
Einführen der Brammen in ein Steckelwalzwerk (160); und  Inserting the slabs into a Steckel mill (160); and
Dickenreduzieren der Brammen in dem Steckelwalzwerk mit mindestens 3 Stichen auf eine gewünschte Dicke zu einem Vorband (220);  Reducing the thickness of the slabs in the Steckel mill by at least 3 passes to a desired thickness to a pre-strip (220);
dadurch gekennzeichnet,  characterized,
dass der Gießstrang (200) geglättet wird bevor seine Temperatur homogenisiert wird; und  that the cast strand (200) is smoothed before its temperature is homogenized; and
dass nach der Temperatur-Homogenisierung die Brammen direkt in das Steckelwalzwerk (160) eingeführt und dort dem ersten Stich unterzogen werden, bevor sie erstmals einem Wickelofen des Steckelwalzwerks zugeführt werden.  that after the temperature homogenization, the slabs are introduced directly into the Steckel mill (160) and there subjected to the first pass before they are first fed to a winding furnace of the Steckel mill.
10.Verfahren nach Anspruch 9, 10.A method according to claim 9,
dadurch gekennzeichnet,  characterized,
dass die Gießgeschwindigkeit des Gießstrangs zwischen 5 und 25 m/min beträgt.  that the casting speed of the cast strand is between 5 and 25 m / min.
1 1 .Verfahren nach Anspruch 9 oder 10, 1 1 .Method according to claim 9 or 10,
dadurch gekennzeichnet,  characterized,
dass die Brammen nach der Temperatur-Homogenisierung, aber vor ihrem Einlauf in das Steckelwalzwerk (160) nochmals vorzugsweise induktiv erwärmt werden.  that the slabs after the temperature homogenization, but before their entry into the Steckel mill (160) are again preferably heated inductively.
12. Verfahren nach einem der Ansprüche 9 bis 1 1 , 12. The method according to any one of claims 9 to 1 1,
dadurch gekennzeichnet,  characterized,
dass der Gießstrang vor seinem Eintritt in das Steckelwalzwerk in  that the cast strand before entering the Steckel mill in
Brammen vorbestimmter Länge zerteilt wird. Slabs of predetermined length is divided.
13. Verfahren nach einem der Ansprüche 9 bis 12, 13. The method according to any one of claims 9 to 12,
dadurch gekennzeichnet,  characterized,
dass der Gießstrang (200) aus Kohlenstoffstahl besteht.  that the cast strand (200) consists of carbon steel.
14. Verfahren nach einem der Ansprüche 9 bis 13, 14. The method according to any one of claims 9 to 13,
dadurch gekennzeichnet,  characterized,
dass der Gießstrang (200) mit einer Gießdicke zwischen 10 und 20 mm gegossen wird.  that the cast strand (200) is cast with a casting thickness between 10 and 20 mm.
15. Verfahren nach einem der Ansprüche 9 bis 14, 15. The method according to any one of claims 9 to 14,
dadurch gekennzeichnet,  characterized,
dass die Vorbänder nach ihrem Auslauf aus dem Steckelwalzwerk gekühlt werden.  that the pre-bands are cooled after their outlet from the Steckel mill.
16. Verfahren nach Anspruch 15, 16. The method according to claim 15,
dadurch gekennzeichnet,  characterized,
dass die Vorbänder, nachdem sie gekühlt wurden, zu einem Bund (250) aufgewickelt werden.  that the pre-tapes, after being cooled, are wound up into a collar (250).
EP14747587.5A 2013-07-30 2014-07-29 Casting and rolling plant and method for producing slabs Active EP3027331B1 (en)

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DE102004062636B4 (en) * 2004-12-21 2007-05-24 Salzgitter Flachstahl Gmbh Device for horizontal strip casting of steel
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