EP0823294A1 - Method and installation for manufacturing strips of low-carbon and ultra-low-carbon steel - Google Patents

Method and installation for manufacturing strips of low-carbon and ultra-low-carbon steel Download PDF

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Publication number
EP0823294A1
EP0823294A1 EP97250225A EP97250225A EP0823294A1 EP 0823294 A1 EP0823294 A1 EP 0823294A1 EP 97250225 A EP97250225 A EP 97250225A EP 97250225 A EP97250225 A EP 97250225A EP 0823294 A1 EP0823294 A1 EP 0823294A1
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EP
European Patent Office
Prior art keywords
strip
rolling
low
temperature
carbon
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.)
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Application number
EP97250225A
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German (de)
French (fr)
Inventor
Peter Ing. Meyer
Ulrich Dipl.-Ing. Skoda-Dopp
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Vodafone GmbH
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Mannesmann AG
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Publication date
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Publication of EP0823294A1 publication Critical patent/EP0823294A1/en
Withdrawn legal-status Critical Current

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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
    • B21B1/22—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
    • 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
    • B21B1/463—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 continuous process, i.e. the cast not being cut before rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/02—Austenitic rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/04—Ferritic rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip casting

Definitions

  • the invention relates to a method and a plant for producing tape low-carbon and ultra-low-carbon steels according to the generic term of Claims 1 and 4.
  • the intermediate strip which is hot-rolled in this way, is divided into partial lengths by means of band shears, which are wound into coils and later unwound again for further hot rolling.
  • the strip-like material is heated again by inductive heating to a hot rolling temperature above 1100 ° C .; the second hot rolling is carried out at temperatures above Ar 3 . This is followed immediately by cooling to a temperature below the transition point Ar 3, preferably in the range from 600 to 250 ° C.
  • the strip material thus produced is then finish-rolled by cold rolling on one or more stands connected in series and wound into coils.
  • the known method aims at the production of cold rolled strip with one as little energy expenditure as possible. To do this, use the method of casting close to the final dimension (thin slab production) and does that Hot rolling in part with the heat remaining from the continuous casting process out.
  • the object of the present invention is to provide a method and a system for Production of strips from low-carbon and ultra-low-carbon steels to create the kind mentioned in the beginning with the or in an endless process hot rolled ferritic strip can be produced using the casting heat, whereby a control element to achieve the recrystallization temperature in the bundle of over 700 ° C is created.
  • the invention proposes that the ferritic rolled finished strip is coiled into a bundle, with a coiling temperature ⁇ 700 ° C is set.
  • the reel temperature is ⁇ 700 ° C already during the last rolling passes and / or immediately before the reel is rewound
  • the tape is adjusted and the finished tape is wound up at this temperature.
  • the targeted setting of this temperature will be the previously missing Control facility created to take advantage of the casting and Rolling temperatures in the area below the ferritic rolling Conversion point (below 738 ° C) and on the other hand at minimum possible energy use the required reel temperature of over 700 ° C to reach.
  • Reel temperature of ⁇ 700 ° C during reeling and / or in the finished bundle adjust.
  • a facility for performing the above method is characterized by the features of claim 4 characterized.
  • the Heating device designed to heat the finished strip as an induction heater is. If namely the heating device in the area of the last roll stand (s) is arranged, so is a very quick response for temperature regulation required. This is determined by the intensity of the coils of an induction heating device enables.
  • the heating device is used to heat the federal government train tunnel furnace arranged behind the reel device. It can also Heater can be designed as a conventional hood furnace.
  • a targeted temperature profile e.g. the cooling can be carried out in the bunch. It also becomes even Temperature achieved in the coil, which is particularly quicker cooling outer turns or edges of the coil is very important.
  • the tunnel oven behind the reel can be arranged perpendicular to the rolling axis and at the same time serve as storage for the bundles.
  • a system is roughly shown schematically, which for Implementation of the method according to the invention is suitable.
  • the facility exists from the continuous casting device 1 for producing a thin slab 2, which in Subsequent arch structure of the casting plant after solidification into a horizontal Outlet direction is guided.
  • a device 10 is used to set one for the Rolling process defined piercing temperature by the from the rolling process resulting temperature maintained or by radiation of the thin slab is reduced. If the temperature coming from the casting process If thin slab is too low for piercing in the rolling mill, heat is added.
  • Hot rolling device 4 for producing an intermediate belt.
  • the the intermediate strip leaving the hot rolling device 4 is in a cooling device 5 subjected to an accelerated cooling by means of cooling liquid, the selected temperatures according to the invention can be set. That the The intermediate belt leaving the cooling device now has a temperature below 738 ° C and is at these temperatures in a finishing mill in at least three Roll passes ferritically rolled into a strip ⁇ 0.7 mm thick.
  • an inductive heating device 7 is provided on rolling mill 6, with which the finished belt is heated to a temperature ⁇ 700 ° C, with which the belt in the subsequent reel device is wound into a bundle. After The belt is reached with the help of the cross-cut shear to achieve the desired coil weight 8 separated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

Production for low carbon and ultra low carbon steel strip, comprising a continuous cast thin slab strand ≥ 70mm thick is austentically rolled to an intermediate thickness of ≤ 20mm at a temperature range of 1150 degrees to 900 degrees C, followed by accelerated cooling to a temperature of <738 degrees ; - the cooled intermediate strip is finish rolled in the ferritic range below 738 degrees C in at least three passes to strip ≤ 0.7mm thick, and - the finished strip is coiled at a controlled temperature of over 700 degrees C. Also claimed is a process plant.

Description

Die Erfindung betrifft ein Verfahren und eine Anlage zur Herstellung von Band aus niedriggekohlten und ultra-niedriggekohlten Stählen gemäß dem Oberbegriff der Patentansprüche 1 und 4.The invention relates to a method and a plant for producing tape low-carbon and ultra-low-carbon steels according to the generic term of Claims 1 and 4.

Aus der EP 0 541 574 B1 ist ein Verfahren bekannt, bei dem Fertigband mit Kaltwalzeigenschaften direkt in einer Warmwalzstraße aus einem durch endabmessungnahes Gießen erzeugten Vormaterial hergestellt wird. In einer Stranggießanlage wird ein Dünnbrammenstrang mit einer Dicke von maximal 100 mm erzeugt, wobei unmittelbar hinter der Stranggießkokille eine Walzeinrichtung angeordnet ist, auf der der Gießstrang mit flüssigem und festem Kern auf die Erstarrungsdicke gewalzt wird. Der entzunderte Dünnbrammenstrang wird bei Temperaturen oberhalb 1100 °C auf einer Walzeinrichtung mit z.B. drei Gerüsten auf eine Dicke von 10 bis 30 mm reduziert. Das auf diese Weise warmgewalzte Zwischenband wird mittels einer Bandschere in Teillängen aufgeteilt, die zu Coils aufgewickelt und später zum weiteren Warmwalzen wieder abgewickelt werden. Vor dem Warmwalzen, vorzugsweise noch vor dem Aufcoilen wird das bandförmige Material durch induktive Erwärmung wieder auf eine Warmwalztemperatur oberhalb 1100 °C aufgeheizt; das zweite Warmwalzen wird bei Temperaturen oberhalb Ar3 durchgeführt. Unmittelbar danach folgt eine Abkühlung auf eine Temperatur unterhalb des Umwandlungspunktes Ar3, vorzugsweise im Bereich von 600 bis 250 °C. Anschließend wird das so erzeugte Bandmaterial durch Kaltwalzen auf einem oder mehreren hintereinander geschalteten Gerüsten fertiggewalzt und zu Coils aufgewickelt.From EP 0 541 574 B1 a method is known in which finished strip with cold rolling properties is produced directly in a hot rolling mill from a raw material produced by casting close to the final dimension. In a continuous caster, a thin slab strand with a maximum thickness of 100 mm is produced, with a rolling device being arranged directly behind the continuous casting mold, on which the casting strand with a liquid and solid core is rolled to the solidification thickness. The descaled thin slab strand is reduced to a thickness of 10 to 30 mm at temperatures above 1100 ° C on a rolling device with, for example, three stands. The intermediate strip, which is hot-rolled in this way, is divided into partial lengths by means of band shears, which are wound into coils and later unwound again for further hot rolling. Before hot rolling, preferably before coiling, the strip-like material is heated again by inductive heating to a hot rolling temperature above 1100 ° C .; the second hot rolling is carried out at temperatures above Ar 3 . This is followed immediately by cooling to a temperature below the transition point Ar 3, preferably in the range from 600 to 250 ° C. The strip material thus produced is then finish-rolled by cold rolling on one or more stands connected in series and wound into coils.

Das bekannte Verfahren bezweckt die Herstellung von Kaltwalzband mit einem möglichst geringen Energieaufwand. Hierzu bedient man sich der Methode des endabmessungsnahen Gießens (Dünnbrammenerzeugung) und führt das Warmwalzen zu einem Teil bei der aus dem Stranggießprozeß verbleibenden Wärme aus.The known method aims at the production of cold rolled strip with one as little energy expenditure as possible. To do this, use the method of casting close to the final dimension (thin slab production) and does that Hot rolling in part with the heat remaining from the continuous casting process out.

Sollen niedriggekohlte und ultra-niedriggekohlte Stähle unterhalb des Umwandlungspunktes Ar3 ferritisch zu Fertigband ausgewalzt werden, so besteht die Forderung, daß das unter 738 °C im rein ferritischen Bereich gewalzte Band anschließend einer Rekristallisation unterzogen wird, die gewöhnlich im Coil bei Temperaturen oberhalb 700 °C erfolgt. Bei Endloswalzprozessen entsteht bei der Erfüllung dieser Forderung das Problem, daß infolge der starren Kupplung des Verfahrens an die Gießgeschwindigkeit der Stranggießanlage und infolge der sich nach dem Konti-Gesetz sich ergebenden verhältnismäßig geringen Endwalzgeschwindigkeit die angestrebte Haspeltemperatur von über 700 °C nur in Grenzfällen und unter optimalen Bedingungen erzielt werden. Da die Gießgeschwindigkeit nicht verändert werden kann, gibt es praktisch keine Regelungsmöglichkeiten zur Erhöhung der Haspeltemperatur.If low-carbon and ultra-low-carbon steels are to be rolled ferritically below the conversion point Ar 3 to finished strip, there is a requirement that the strip rolled below 738 ° C in the purely ferritic range is subsequently subjected to recrystallization, which is usually in the coil at temperatures above 700 ° C is done. In the case of endless rolling processes, the problem arises when this requirement is met that, due to the rigid coupling of the process to the casting speed of the continuous casting installation and due to the relatively low final rolling speed resulting from the Konti law, the desired coiling temperature of over 700 ° C is only in limit cases and below optimal conditions can be achieved. Since the casting speed cannot be changed, there are practically no control options for increasing the reel temperature.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren und eine Anlage zur Herstellung von Band aus niedriggekohlten und ultra-niedriggekohlten Stählen der eingangs genannten Art zu schaffen, mit dem bzw. der in einem endlosen Prozeß ferritisch gewaltztes Warmband unter Ausnutzung der Gießhitze herstellbar ist, wobei ein Regelglied zur Erreichung der Rekristallisationstemperatur im Bund von über 700 °C ein geschaffen wird.The object of the present invention is to provide a method and a system for Production of strips from low-carbon and ultra-low-carbon steels to create the kind mentioned in the beginning with the or in an endless process hot rolled ferritic strip can be produced using the casting heat, whereby a control element to achieve the recrystallization temperature in the bundle of over 700 ° C is created.

Zur Lösung der Aufgabe wird erfindungsgemäß vorgeschlagen, daß das ferritisch gewalzte Fertigband zu einem Bund aufgehaspelt wird, wobei eine Haspeltemperatur ≥ 700 °C eingestellt wird. Vorzugsweise wird die Haspeltemperatur von ≥ 700 °C bereits während der letzten Walzstiche und/oder unmittelbar vor dem Aufhaspeln des Bandes eingestellt und das Fertigband wird mit dieser Temperatur aufgehaspelt. Durch die Möglichkeit der gezielten Einstellung dieser Temperatur wird die bislang fehlende Regelmöglichkeit geschaffen, um einerseits unter Ausnutzung der Gieß- und Walztemperaturen ein ferritisches Walzen im Bereich unterhalb des Umwandlungspunktes (unter 738 °C) vorzunehmen und andererseits bei geringsmöglichem Energieeinsatz die geforderte Haspeltemperatur von über 700 °C zu erreichen. In einer günstigen Ausgestaltung des Verfahrens ist auch denkbar, die Haspeltemperatur von ≥ 700 °C während des Aufhaspelns und/oder im Fertigbund einzustellen.To achieve the object, the invention proposes that the ferritic rolled finished strip is coiled into a bundle, with a coiling temperature ≥ 700 ° C is set. Preferably the reel temperature is ≥ 700 ° C already during the last rolling passes and / or immediately before the reel is rewound The tape is adjusted and the finished tape is wound up at this temperature. By the possibility of the targeted setting of this temperature will be the previously missing Control facility created to take advantage of the casting and Rolling temperatures in the area below the ferritic rolling Conversion point (below 738 ° C) and on the other hand at minimum possible energy use the required reel temperature of over 700 ° C to reach. In a favorable embodiment of the method, it is also conceivable that Reel temperature of ≥ 700 ° C during reeling and / or in the finished bundle adjust.

Eine Anlage zur Durchführung des vorstehenden Verfahrens ist durch die Merkmale des Anspruchs 4 gekennzeichnet. Erfindungsgemäß ist eine Heizvorrichtung zum Erwärmen des Fertigbandes und/oder des Bundes auf Haspeltemperatur im Bereich mindestens des letzten Walzgerüstes und/oder vor dem Haspel angeordnet. Mit dieser Heizvorrichtung kann die Abkühlung des Bandes in den Walzgerüsten zum ferritischen Walzen kompensiert werden und die zur Rekristallisation erforderliche Temperatur über 700 °C eingestellt werden.A facility for performing the above method is characterized by the features of claim 4 characterized. According to the invention is a heater for Heating the finished strip and / or the coil to the reel temperature in the area at least the last roll stand and / or arranged in front of the reel. With this Heater can cool the strip in the mill stands for ferritic Rolls are compensated and the temperature required for recrystallization can be set above 700 ° C.

In einer besonderen Ausgestaltung der Erfindung wird vorgeschlagen, daß die Heizvorrichtung zum Erwärmen des Fertigbandes als Induktionsheizung ausgebildet ist. Wenn nämlich die Heizvorrichtung im Bereich des bzw. der letzten Walzgerüst angeordnet ist, so ist eine sehr schnelle Reaktion für eine Regelung der Temperatur erforderlich. Diese wird durch die Intensität der Spulen einer Induktionsheizvorrichtung ermöglicht.In a special embodiment of the invention it is proposed that the Heating device designed to heat the finished strip as an induction heater is. If namely the heating device in the area of the last roll stand (s) is arranged, so is a very quick response for temperature regulation required. This is determined by the intensity of the coils of an induction heating device enables.

Alternativ dazu ist vorgesehen, die Heizvorrichtung zum Erwärmen des Bundes als hinter der Haspelvorrichtung angeordneten Tunnelofen auszubilden. Auch kann die Heizvorrichtung als konventioneller Haubenofen gestaltet sein.As an alternative to this, it is provided that the heating device is used to heat the federal government train tunnel furnace arranged behind the reel device. It can also Heater can be designed as a conventional hood furnace.

Im Falle des Tunnelofens oder der Haube kann ein gezielter Temperaturverlauf, z.B. die Abkühlung im Bund durchgeführt werden. Außerdem wird eine gleichmäßige Temperatur im Coil erzielt, was insbesondere im Hinblick auf die schneller abkühlenden Außenwindungen oder Kanten des Coils sehr wichtig ist. Der Tunnelofen hinter dem Haspel kann rechtwinklig zur Walzachse angeordnet sein und gleichzeitig als Speicher für die Bunde dienen. In the case of the tunnel oven or the hood, a targeted temperature profile, e.g. the cooling can be carried out in the bunch. It also becomes even Temperature achieved in the coil, which is particularly quicker cooling outer turns or edges of the coil is very important. The tunnel oven behind the reel can be arranged perpendicular to the rolling axis and at the same time serve as storage for the bundles.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend erläutert.An embodiment of the invention is shown in the drawing and will explained below.

In der einzigen Zeichnungsfigur ist grob schematisch eine Anlage dargestellt, die zur Durchführung des erfindungsgemäßen Verfahrens geeignet ist. Die Anlage besteht aus der Stranggießeinrichtung 1 zur Erzeugung einer Dünnbramme 2, die im anschließenden Bogengerüst der Gießanlage nach Erstarrung in eine horizontale Auslaufrichtung geführt wird. Eine Vorrichtung 10 dient zum Einstellen einer für den Walzprozeß definierten Anstichtemperatur, indem die aus dem Walzprozeß resultierende Temperatur gehalten oder durch Abstrahlung der Dünnbramme verringert wird. Wenn die aus dem Gießprozeß kommende Temperatur der Dünnbramme für das Anstechen im Walzwerk zu niedrig ist, wird Wärme zugeführt.In the single drawing figure, a system is roughly shown schematically, which for Implementation of the method according to the invention is suitable. The facility exists from the continuous casting device 1 for producing a thin slab 2, which in Subsequent arch structure of the casting plant after solidification into a horizontal Outlet direction is guided. A device 10 is used to set one for the Rolling process defined piercing temperature by the from the rolling process resulting temperature maintained or by radiation of the thin slab is reduced. If the temperature coming from the casting process If thin slab is too low for piercing in the rolling mill, heat is added.

Im Anschluß an die Vorrichtung 10 erfolgt in bekannter Weise ein Entzundern der Dünnbramme, bevor sie in die zwei aufeinanderfolgenden Quartowalzgerüste einer Warmwalzeinrichtung 4 zur Herstellung eines Zwischenbandes eingeführt wird. Das die Warmwalzeinrichtung 4 verlassende Zwischenband wird in einer Abkühlvorrichtung 5 mittels Kühlflüssigkeit einer beschleunigten Abkühlung unterzogen, wobei die erfindungsgemäßen ausgewählten Temperaturen eingestellt werden. Das die Abkühleinrichtung verlassende Zwischenband hat nun eine Temperatur unterhalb von 738 °C und wird bei diesen Temperaturen in einer Fertigwalzstraße in mindestens drei Walzstichen ferritisch zu einem Band ≤ 0,7 mm Dicke fertiggewalzt. Hinter der Walzstraße 6 ist erfindungsgemäß eine induktive Heizvorrichtung 7 vorgesehen, mit der das Fertigband auf eine Temperatur ≥ 700 °C erwärmt wird, mit der das Band in der nachfolgenden Haspeleinrichtung zu einem Bund aufgewickelt wird. Nach Erreichen des erwünschten Bundgewichtes wird das Band mit Hilfe der Querteilschere 8 abgetrennt.Following the device 10, descaling takes place in a known manner Thin slab before entering the two consecutive four-high stands Hot rolling device 4 is introduced for producing an intermediate belt. The the intermediate strip leaving the hot rolling device 4 is in a cooling device 5 subjected to an accelerated cooling by means of cooling liquid, the selected temperatures according to the invention can be set. That the The intermediate belt leaving the cooling device now has a temperature below 738 ° C and is at these temperatures in a finishing mill in at least three Roll passes ferritically rolled into a strip ≤ 0.7 mm thick. Behind the According to the invention, an inductive heating device 7 is provided on rolling mill 6, with which the finished belt is heated to a temperature ≥ 700 ° C, with which the belt in the subsequent reel device is wound into a bundle. After The belt is reached with the help of the cross-cut shear to achieve the desired coil weight 8 separated.

Claims (8)

Verfahren zur Herstellung von Band aus niedriggekohlten und ultraniedriggekohlten Stählen, bestehend aus folgenden zeitlich hintereinander liegenden Schritten: a) Aus einer Stahlschmelze wird durch Stranggießen ein Dünnbrammenstrang in einer Dicke von ≥ 70 mm (Erstarrungsdicke) hergestellt, c) Der Dünnbrammenstrang wird bei Temperaturen im Bereich 1150° - 900 C durch austenitisches Walzen zu einem Zwischenband von ≤20 mm Dicke verarbeitet. d) Nach dem austenitischen Walzen gemäß Schritt a) erfolgt ein beschleunigtes Abkühlen des Zwischenbandes auf eine Temperatur im Bereich < 738°C. e) Das abgekühlte Zwischenband wird bei einer Temperatur unterhalb 738° in einer Fertigwalzstraße in mindestens drei Walzstichen ferritisch zu Bändern von ≤ 0,7 mm Dicke fertiggewalzt. f) Das Fertigband wird zu einem Bund aufgehaspelt, wobei eine Haspeltemperatur von ≥700 °C eingestellt wird. Process for producing strip from low-carbon and ultra-low-carbon steels, consisting of the following steps in succession: a) A thin slab strand with a thickness of ≥ 70 mm (solidification thickness) is produced from a molten steel by continuous casting, c) The thin slab strand is processed at temperatures in the range 1150 ° - 900 C by austenitic rolling to an intermediate strip of ≤20 mm thickness. d) After the austenitic rolling in step a), the intermediate strip is cooled to a temperature in the range of <738 ° C. e) The cooled intermediate strip is ferritically finished in at least three pass passes at a temperature below 738 ° in a finishing mill to form strips of ≤ 0.7 mm thickness. f) The finished strip is coiled into a bundle, setting a coiling temperature of ≥700 ° C. Verfahren zur Herstellung von Band aus niedriggekohltem und ultra niedriggekohltem Stählen nach Anspruch 1,
dadurch gekennzeichnet,
daß die Haspeltemperatur von ≥700 °C bereits während der letzten Walzstiche und/oder unmittelbar vor dem Aufhaspeln im Band eingestellt wird und das Fertigband mit dieser Temperatur aufgehaspelt wird. A method of producing low-carbon and ultra-low-carbon steel strip according to claim 1,
characterized,
that the reel temperature of ≥700 ° C is already set during the last rolling pass and / or immediately before reeling in the strip and the finished strip is reeled at this temperature. Verfahren zur Herstellung von Band aus niedriggekohltem und ultra niedriggekohltem Stählen nach Anspruch 1,
dadurch gekennzeichnet,
daß die Haspeltemperatur von ≥700 °C während des Aufhaspelns und/oder im Fertigbund eingestellt wirdA method of producing low-carbon and ultra-low-carbon steel strip according to claim 1,
characterized,
that the reel temperature of ≥700 ° C is set during reeling and / or in the finished bundle Anlage zur Herstellung von Band aus niedriggekohltem und ultra niedriggekohltem Stählen zur Durchführung des Verfahrens nach den Ansprüchen 1 bis 3, mit einer Stranggießeinrichtung (1) zur Erzeugung von Dünnbrammen (2), mit einer hinter der Stranggießeinrichtung (1) angeordneten Entzunderungseinrichtung (3) für den erstarrten Strang, mit einer im Anschluß an die Entzunderungseinrichtung (3) angeordneten Warmwalzeinrichtung (4), die aus mindestens zwei aufeinanderfolgenden Gerüsten oder einem Reversiergerüst besteht, mit einer hinter der Warmwalzeinrichtung (4) angeordneten Abkühleinrichtung (5) zur beschleunigten Abkühlung des in der Warmwalzeinrichtung (4) erzeugten Zwischenbandes, mit mindestens drei hinter der ersten Abkühleinrichtung angeordneten Walzgerüsten einer Walzstraße (6) zum ferritischen Walzen des Zwischenbandes, mit einer unmittelbar hinter der Walzstraße (6) angeschlossenen Haspeleinrichtung (9) zum Aufwickeln des erzeugten Fertigbandes zu einem Bund gekennzeichnet durch die Anordnung einer Heizvorrichtung (7) zum Erwärmen des Fertigbandes und/oder des Bundes auf Haspeltemperatur im Bereich mindestens des letzten Walzgerüstes der Walzstraße (6) und/oder vor der Haspeleinrichtung (9). Plant for producing strip from low-carbon and ultra-low-carbon steels for carrying out the process according to Claims 1 to 3, with a continuous casting device (1) for producing thin slabs (2), with a descaling device (3) for the solidified strand arranged behind the continuous casting device (1), with a hot rolling device (4) arranged after the descaling device (3), which consists of at least two successive stands or a reversing stand, with a cooling device (5) arranged behind the hot rolling device (4) for accelerated cooling of the intermediate strip produced in the hot rolling device (4), with at least three rolling stands of a rolling mill (6) arranged behind the first cooling device for ferritic rolling of the intermediate strip, with a reel device (9) connected directly behind the rolling mill (6) for winding the finished strip into a bundle characterized by the arrangement of a heating device (7) for heating the finished strip and / or the coil to reel temperature in the area of at least the last rolling stand of the rolling train (6) and / or in front of the reel device (9). Anlage nach Anspruch 4,
gekennzeichnet durch eine Vorrichtung (10) zum Einstellen einer für den Walzprozeß definierten Anstichtemperatur zwischen Stranggießeinrichtung (1) und Entzunderungseinrichtung (3).System according to claim 4,
characterized by a device (10) for setting a piercing temperature defined for the rolling process between the continuous casting device (1) and the descaling device (3). Anlage nach Anspruch 4,
dadurch gekennzeichnet,
daß die Heizvorrichtung (7) zum Erwärmen des Fertigbandes als Induktionsheizung ausgebildet ist.System according to claim 4,
characterized,
that the heating device (7) is designed to heat the finished strip as an induction heater. Anlage nach Anspruch 4,
dadurch gekennzeichnet,
daß die Heizvorrichtung (7) zum Erwärmen des Bundes als hinter der Haspelvorrichtung angeordneter Tunnelofen ausgebildet ist.System according to claim 4,
characterized,
that the heating device (7) for heating the coil is designed as a tunnel oven arranged behind the reel device. Anlage nach Anspruch 4,
dadurch gekennzeichnet,
daß die Heizvorrichtung (7) zum Erwärmen des Bundes als hinter der Haspelvorrichtung angeordneter Haubenofen ausgebildet ist.System according to claim 4,
characterized,
that the heating device (7) for heating the coil is designed as a hood oven arranged behind the reel device.
EP97250225A 1996-08-05 1997-07-31 Method and installation for manufacturing strips of low-carbon and ultra-low-carbon steel Withdrawn EP0823294A1 (en)

Applications Claiming Priority (2)

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DE1996132448 DE19632448A1 (en) 1996-08-05 1996-08-05 Process and plant for producing strip from low-carbon and ultra-low-carbon steels
DE19632448 1996-08-05

Publications (1)

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EP0823294A1 true EP0823294A1 (en) 1998-02-11

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AT509707A4 (en) * 2010-05-04 2011-11-15 Siemens Vai Metals Tech Gmbh METHOD FOR HOT ROLLING OF STEEL STRIPS AND HOT ROLLING STRIP

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