WO1999058731A1 - Method and system for producing a hot-rolled strip - Google Patents

Method and system for producing a hot-rolled strip Download PDF

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Publication number
WO1999058731A1
WO1999058731A1 PCT/EP1999/003057 EP9903057W WO9958731A1 WO 1999058731 A1 WO1999058731 A1 WO 1999058731A1 EP 9903057 W EP9903057 W EP 9903057W WO 9958731 A1 WO9958731 A1 WO 9958731A1
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WO
WIPO (PCT)
Prior art keywords
temperature
hot
time
hot strip
strip
Prior art date
Application number
PCT/EP1999/003057
Other languages
German (de)
French (fr)
Inventor
Ernst-Reinhard Oberhaus
Original Assignee
Abb Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Patent Gmbh filed Critical Abb Patent Gmbh
Priority to AU39319/99A priority Critical patent/AU3931999A/en
Publication of WO1999058731A1 publication Critical patent/WO1999058731A1/en

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Classifications

    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table

Definitions

  • the invention relates to an arrangement and to a method for producing hot strip according to the preamble of claims 1 and 2.
  • hot strip is produced using a thin slab caster. to produce a downstream compensation furnace and hot rolling stands ⁇ .
  • the hot strip emerging from the hot rolling stands is usually cooled using a cooling section in order to be able to wind it up at a suitable temperature.
  • the invention has for its object to provide an arrangement and a method for producing hot strip of the type mentioned, which contributes to the production of steel strip with the desired material properties.
  • the advantages that can be achieved with the invention consist, in particular, in that the subsequent material properties of the steel strip are influenced in the desired manner by targeted temperature control after hot rolling.
  • the process flow is like this. that after rolling, the desired temperature can be selected by heating 2 or cooling is set and then kept constant at the desired value for at least a predetermined period.
  • a thin slab caster 1 produces casting tape of the desired thickness, which is passed through a compensating furnace 2 to a hot-forming device, i. H. Hot rolling stands 10 arrives, in which the hot strip is reduced according to the requirements (for example to hot strip thicknesses below 1 mm).
  • the hot strip B arrives in a device 4 for temperature control by heating and / or cooling during a predetermined temperature / time cycle, that is, for targeted temperature control and thus for setting desired material properties.
  • the material properties are influenced in the desired sense, for example by temperature treatment in the ferrite area in such a way that the subsequent processes, such as cold forming, can be carried out with reduced effort.
  • the hot strip B leaves the device 4 and then arrives at a reel, for example.
  • the hot strip is then kept constant at T4 for a period ranging from t2 to time t3 before it is cooled from time t3 so that it can leave the device 4 with the desired end temperature T1 at time t4.
  • the hot strip is then kept constant at T2 for a period of time from t2 to time t3 before it is cooled from time t3 so that it can leave the device 4 with the desired final temperature T1 at time t4.
  • the hot strip is 'kept reaching period constant at T2 or T3 or T4 before it from the time t3' during one of t2 to time t3 is cooled so that it at the time t4 ', the temperature T2' or T3 'or T4' , on which it is kept constant for a period ranging from t4 'to time t3 before it is cooled from time t3 in order to be able to leave device 4 at time t4 with the desired final temperature T1.
  • the hot strip is kept constant at at least one desired temperature for at least a predetermined period of time, for example on T4 in the embodiment of FIG. 2, on T3 in the embodiment of FIG. 3, on T2 in the embodiment of FIG 4 and on T2 / T3 / T4 or T27T37T4 ' in the exemplary embodiment according to Fig. 5.
  • Keeping the hot strip temperature constant is also understood to mean that the temperature is kept within a predetermined temperature range with upper and lower limits. The upper and lower limits are specified in such a way that the desired product properties are achieved.
  • the invention is explained below using a specific exemplary embodiment.
  • the production of hot strip from an IF steel with a final thickness of less than 1 mm is required in a quality that has previously only been achieved by cold-rolled soft strips, which are used for further cold forming.
  • it is necessary to deform the hot strip in the ferrite area with a total deformation of ⁇ 1, 2. It is advantageous to maintain a rolling temperature of 700 ° C, especially in the last few passes, in order to create the texture required for later product quality.
  • the hot strip produced in this way must then be wound on the reel at a temperature of greater than 670 ° C. so that the material can recrystallize in the hot bath and thus become soft. It must therefore be ensured that the strip does not cool below 680 ° C on the stretch between the roll stand and the reel.
  • the hot-rolled strip is first heated with an inductive heating section and then the cooling of the strip is delayed over the roller table length by inductive heating elements to such an extent that a strip temperature of greater than 680 ° is reached in front of the reel.

Abstract

The invention relates to a device for producing a hot-rolled strip using hot-rolling stands (3). A device (4) for the targeted control of the hot-rolled strip temperature by heating and/or cooling, followed by at least a single stabilization and final cooling, is positioned after the hot-rolling stands (3). The invention also relates to a method for producing hot-rolled strips by means of hot rolling. According to this method, after hot rolling the hot-rolled strip (B), for the purpose of targeted temperature control, in a first step of a defined temperature/time cycle is brought to a first desired temperature (T2, T3, T4) for a defined period. In a second step the hot-rolled strip is stabilized at this first desired temperature for a defined period and in a final step brought to a desired end temperature (T1) for a defined period. The final step may be preceded by additional steps for stabilizing the hot-rolled strip at other desired temperatures. This results in the desired product characteristics.

Description

Anordnung und Verfahren zum Erzeugen von Warmband Arrangement and method for producing hot strip
Beschreibungdescription
Die Erfindung bezieht sich auf eine Anordnung und auf ein Verfahren zum Erzeugen von Warmband gemäß dem Oberbegriff der Ansprüche 1 und 2.The invention relates to an arrangement and to a method for producing hot strip according to the preamble of claims 1 and 2.
Es ist allgemein bekannt, Warmband mit Hilfe einer Düπnbrammengießanlage. einem nachgeordneten Ausgleichsofen und Warmwalzgerüste π zu produzieren. Üblicherweise wird das aus den Warmwalzgerüsten austretende Warmband unter Einsatz einer Kühlstrecke abgekühlt, um es mit geeigneter Temperatur aufhaspeln zu können.It is generally known that hot strip is produced using a thin slab caster. to produce a downstream compensation furnace and hot rolling stands π. The hot strip emerging from the hot rolling stands is usually cooled using a cooling section in order to be able to wind it up at a suitable temperature.
Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung und ein Verfahren zum Erzeugen von Warmband der eingangs genannten Art anzugeben, die bzw. das dazu beiträgt, Stahlband mit gewünschten Materialeigenschaften herzustellen.The invention has for its object to provide an arrangement and a method for producing hot strip of the type mentioned, which contributes to the production of steel strip with the desired material properties.
Diese Aufgabe wird bezüglich der Anordnung in Verbindung mit den Merkmalen des Oberbegriffes erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale gelöst.This object is achieved according to the invention in relation to the arrangement in connection with the features of the preamble by the features specified in the characterizing part of claim 1.
Diese Aufgabe wird bezüglich des Verfahrens in Verbindung mit den Merkmalen des Oberbegriffes erfiπdungsgemäß durch die im Kennzeichen des Anspruchs 2 angegebenen Merkmale gelöst.This object is achieved according to the invention in relation to the method in conjunction with the features of the preamble by the features specified in the characterizing part of claim 2.
Die mit der Erfindung erzielbaren Vorteile bestehen insbesondere darin, daß durch gezielte Temperaturführung nach dem Warmwalzen die späteren Materialeigenschaften des Stahlbandes im gewünschten Sinn beeinflußt werden. Der Prozeßablauf ist derart. daß nach dem Walzen zunächst die gewünschte Temperatur wahlweise durch Heizen 2 oder Kühlen eingestellt und anschließend während mindestens eines vorgegebenen Zeitraumes konstant auf dem gewünschten Wert gehalten wird.The advantages that can be achieved with the invention consist, in particular, in that the subsequent material properties of the steel strip are influenced in the desired manner by targeted temperature control after hot rolling. The process flow is like this. that after rolling, the desired temperature can be selected by heating 2 or cooling is set and then kept constant at the desired value for at least a predetermined period.
Die Erfindung wird nachstehend anhand der in der Zeichnung dargestellten Ausfüh- ruπgsbeispiele erläutert. Es zeigen:The invention is explained below on the basis of the exemplary embodiments shown in the drawing. Show it:
Fig. 1 eine Anordnung zum Erzeugen von Warmband,1 shows an arrangement for producing hot strip,
Fig. 2, 3, 4, 5 vier unterschiedliche Temperatur/Zeitzyklen zum Erzeugen von Warmband.Fig. 2, 3, 4, 5 four different temperature / time cycles for generating hot strip.
In Fig. 1 ist eine Anordnung zum Erzeugen von Warmband dargestellt. Eine Dünn- brammengießanlage 1 erzeugt Gießband von gewünschter Dicke, das durch einen Ausgleichsofen 2 zu einer Warmverformungsvorrichtung, d. h. Warmwalzgerüsten 10 gelangt, in denen das Warmband entsprechend den Erfordernissen reduziert wird (beispielsweise auf Warmbanddicken unter 1 mm).1 shows an arrangement for producing hot strip. A thin slab caster 1 produces casting tape of the desired thickness, which is passed through a compensating furnace 2 to a hot-forming device, i. H. Hot rolling stands 10 arrives, in which the hot strip is reduced according to the requirements (for example to hot strip thicknesses below 1 mm).
Das Warmband B gelangt nach dem Walzen zur gezielten Temperaturführung und damit zur Einstellung gewünschter Materialeigenschaften in eine Einrichtung 4 zur Temperaturführung durch Heizen und/oder Kühlen während eines vorgegebenen Tempe- ratur/Zeit-Zyklusses, d. h. nach dem Warmwalzen werden die Materialeigenschaften im gewünschten Sinn beeinflußt, beispielsweise durch Temperaturbehandlung im Ferritbereich derart, daß die nachfolgenden Prozesse, wie beispielsweise die Kaltverformung, mit reduziertem Aufwand durchgeführt werden können. Mit optimaler Bandtemperatur (Endtemperatur) verläßt das Warmband B die Einrichtung 4 und gelangt anschließend beispielsweise zu einer Aufhaspel.After the rolling, the hot strip B arrives in a device 4 for temperature control by heating and / or cooling during a predetermined temperature / time cycle, that is, for targeted temperature control and thus for setting desired material properties. H. After hot rolling, the material properties are influenced in the desired sense, for example by temperature treatment in the ferrite area in such a way that the subsequent processes, such as cold forming, can be carried out with reduced effort. With the optimum strip temperature (final temperature), the hot strip B leaves the device 4 and then arrives at a reel, for example.
In den Fig. 2, 3, 4, 5 sind beispielhaft vier unterschiedliche Temperatur/Zeitzyklen zum Erzeugen von Warmband dargestellt. Bei allen vier Zyklen wird davon ausgegangen, daß das Warmband zum Zeitpunkt t1 mit einer Temperatur T3 in die Einrichtung 4 eintritt. Des weiteren tritt das Warmband bei allen vier Zyklen zum Zeitpunkt t4 mit einer Endtemperatur T1 aus der Einrichtung 4 aus. Die Endtemperatur T1 ist beispielsweise die für das Aufhaspeln des Warmbandes oder für andere nachfolgende Prozeß seh ritte optimale Temperatur.2, 3, 4, 5 four different temperature / time cycles for generating hot strip are shown as examples. In all four cycles it is assumed that the hot strip enters the device 4 at a time T1 at a temperature T3. Furthermore, the hot strip exits the device 4 at all times with a final temperature T1 at time t4. The final temperature is T1, for example the optimum temperature for reeling the hot strip or for other subsequent processes.
Beim Temperatur/Zeitzyklus gemäß Fig. 2 ist es vorgesehen, das mit T3 eintretende Warmband vom Zeitpunkt t1 bis zum Zeitpunkt t2 auf eine Temperatur T4 aufzuheizen. Anschließend wird das Warmband während eines von t2 bis zum Zeitpunkt t3 reichenden Zeitraumes konstant auf T4 gehalten, ehe es ab dem Zeitpunkt t3 abgekühlt wird, damit es zum Zeitpunkt t4 die Einrichtung 4 mit der gewünschten Endtemperatur T1 verlassen kann.In the temperature / time cycle according to FIG. 2, provision is made to heat the hot strip entering T3 from time t1 to time t2 to a temperature T4. The hot strip is then kept constant at T4 for a period ranging from t2 to time t3 before it is cooled from time t3 so that it can leave the device 4 with the desired end temperature T1 at time t4.
Beim Temperatur/Zeitzyklus gemäß Fig. 3 ist es vorgesehen, das Warmband vom Zeitpunkt t1 bis zum Zeitpunkt t3 konstant auf der Eintrittstemperatur T3 zu halten, ehe es ab dem Zeitpunkt t3 abgekühlt wird, damit es zum Zeitpunkt t4 die Einrichtung 4 mit der gewünschten Endtemperatur T1 verlassen kann.In the temperature / time cycle according to FIG. 3, it is provided to keep the hot strip constant at the entry temperature T3 from the time t1 to the time t3 before it is cooled from the time t3, so that the device 4 with the desired end temperature is at the time t4 T1 can leave.
Beim Temperatur/Zeitzyklus gemäß Fig. 4 ist es vorgesehen, das mit T3 eintretende Warmband vom Zeitpunkt t1 bis zum Zeitpunkt t2 auf eine Temperatur T2 abzukühlen. Anschließend wird das Warmband während eines Zeitraumes von t2 bis zum Zeitpunkt t3 konstant auf T2 gehalten, ehe es ab dem Zeitpunkt t3 abgekühlt wird, damit es zum Zeitpunkt t4 die Einrichtung 4 mit der gewünschten Endtemperatur T1 verlassen kann.In the temperature / time cycle according to FIG. 4, provision is made to cool the hot strip entering T3 from time t1 to time t2 to a temperature T2. The hot strip is then kept constant at T2 for a period of time from t2 to time t3 before it is cooled from time t3 so that it can leave the device 4 with the desired final temperature T1 at time t4.
Beim Temperatur/Zeitzyklus gemäß Fig. 5 ist es vorgesehen, das mit T3 eintretende Warmband vom Zeitpunkt t1 bis zum Zeitpunkt t2 auf eine Temperatur T2 oder T4 zu bringen (beispielsweise durch Aufheizen oder Abkühlen). Dieser Schritt ist nicht erforderlich, wenn T3 diejenige Temperatur ist, mit der das Warmband im nachfolgenden Schritt behandelt werden soll. Anschließend wird das Warmband während eines von t2 bis zum Zeitpunkt t3' reichenden Zeitraumes konstant auf T2 oder T3 oder T4 gehalten, ehe es ab dem Zeitpunkt t3' abgekühlt wird, damit es zum Zeitpunkt t4' die Temperatur T2' oder T3' oder T4' aufweist, auf der es während eines von t4' bis zum Zeitpunkt t3 reichenden Zeitraumes konstant gehalten wird, ehe es ab dem Zeitpunkt t3 abgekühlt wird, um die Einrichtung 4 zum Zeitpunkt t4 mit der gewünschten Endtemperatur T1 verlassen zu können. 4In the temperature / time cycle according to FIG. 5, provision is made to bring the hot strip entering T3 to a temperature T2 or T4 from time t1 to time t2 (for example by heating or cooling). This step is not necessary if T3 is the temperature with which the hot strip is to be treated in the subsequent step. Subsequently, the hot strip is 'kept reaching period constant at T2 or T3 or T4 before it from the time t3' during one of t2 to time t3 is cooled so that it at the time t4 ', the temperature T2' or T3 'or T4' , on which it is kept constant for a period ranging from t4 'to time t3 before it is cooled from time t3 in order to be able to leave device 4 at time t4 with the desired final temperature T1. 4
Wesentlich bei allen vier vorstehend beschriebenen Temperatur/Zeitzyklen ist das Konstanthalten des Warmbandes auf mindestens einer gewünschten Temperatur während mindestens einer vorgegebenen Zeitspanne, beispielsweise auf T4 beim Ausführungsbeispiel nach Fig. 2, auf T3 beim Ausführungsbeispiel nach Fig. 3, auf T2 beim Ausführungsbeispiel nach Fig. 4 und auf T2/T3/T4 bzw. T27T37T4' beim Ausführungsbeispiel nach Fig. 5. Hierdurch werden Produkteigenschaften im gewünschten Sinn erzeugt.It is essential for all four temperature / time cycles described above that the hot strip is kept constant at at least one desired temperature for at least a predetermined period of time, for example on T4 in the embodiment of FIG. 2, on T3 in the embodiment of FIG. 3, on T2 in the embodiment of FIG 4 and on T2 / T3 / T4 or T27T37T4 ' in the exemplary embodiment according to Fig. 5. This produces product properties in the desired sense.
Unter dem "Konstanthalten" der Warmband-Temperatur wird auch verstanden, daß die Temperatur innerhalb eines vorgegebenen Temperaturbandes mit Ober- und Untergrenzen gehalten wird. Die Ober- und Untergrenzen werden derart vorgegeben, daß die gewünschten Produkteigenschaften erreicht werden.“Keeping the hot strip temperature constant” is also understood to mean that the temperature is kept within a predetermined temperature range with upper and lower limits. The upper and lower limits are specified in such a way that the desired product properties are achieved.
Die Erfindung wird nachstehend an einem konkreten Ausführungsbeispiel erläutert. Es ist die Erzeugung von Warmband aus einem IF-Stahl mit einer Enddicke kleiner 1 mm in einer Qualität gefordert, die bisher nur von kaltgewalzten weichen Bändern erreicht wird, welche zur weiteren Kaltverformung eingesetzt werden. Um ein solches Warmband zu erzeugen, das Kaltband-Qalitäten substituiert, ist es notwendig, das Warmband im Ferritbereich mit einer Gesamtverformung von γ = 1 ,2 zu verformen. Dabei ist es vorteilhaft, besonders in den letzten Stichen eine Walztemperatur von 700°C einzuhalten, um die für die spätere Produktqualität erforderliche Textur zu erzeugen.The invention is explained below using a specific exemplary embodiment. The production of hot strip from an IF steel with a final thickness of less than 1 mm is required in a quality that has previously only been achieved by cold-rolled soft strips, which are used for further cold forming. In order to produce such a hot strip, which substitutes cold strip qualities, it is necessary to deform the hot strip in the ferrite area with a total deformation of γ = 1, 2. It is advantageous to maintain a rolling temperature of 700 ° C, especially in the last few passes, in order to create the texture required for later product quality.
Das so erzeugte Warmband muß anschließend mit einer Temperatur von größer 670°C auf der Haspel gewickelt werden, damit das Material im Warmbad rekristallisieren kann und damit weich wird. Es ist also sicherzustellen, daß das Band auf der Strecke zwischen Walzgerüst und Haspel nicht unter 680°C abkühlt. Dazu wird das warmgewalzte Band zunächst mit einer induktiven Aufheizstrecke erwärmt und anschließend die Abkühlung des Bandes über die Rollganglänge durch ebenfalls induktive Heizelemente so weit verzögert, daß eine Bandtemperatur von größer 680° vor dem Haspel erreicht wird. The hot strip produced in this way must then be wound on the reel at a temperature of greater than 670 ° C. so that the material can recrystallize in the hot bath and thus become soft. It must therefore be ensured that the strip does not cool below 680 ° C on the stretch between the roll stand and the reel. For this purpose, the hot-rolled strip is first heated with an inductive heating section and then the cooling of the strip is delayed over the roller table length by inductive heating elements to such an extent that a strip temperature of greater than 680 ° is reached in front of the reel.

Claims

Patentansprüche claims
1. Anordnung zum Erzeugen von Warmband unter Verwendung von Warmwalzgerüsten (3), dadurch gekennzeichnet, daß eine Einrichtung (4) zur gezielten Temperaturführung des Warmbandes durch Heizen und/oder Kühlen, anschließendem mindestens einmaligem Konstanthalten und abschließendem Kühlen nach den Warmwaizgerüsten (3) angeordnet ist.1. Arrangement for generating hot strip using hot rolling stands (3), characterized in that a device (4) for targeted temperature control of the hot strip by heating and / or cooling, then at least once constant and final cooling after the hot rolling stands (3) is.
2. Verfahren zum Erzeugen von Warmband durch Warmwalzen, dadurch gekennzeichnet, daß das Warmband (B) nach dem Warmwalzen zur gezielten Temperaturführung in einem ersten Schritt eines vorgegebenen Temperatur/Zeitzyklus- ses innerhalb eines vorgegebenen Zeitraumes auf eine gewünschte erste Temperatur (T2, T3, T4) gebracht wird, in einem zweiten Schritt während eines vorgegebenen Zeitraumes auf dieser gewünschten ersten Temperatur konstant gehalten wird und in einem abschließenden Schritt innerhalb eines vorgegebenen Zeitraumes auf eine gewünschte Endtemperatur (T1) gebracht wird.2. A method for producing hot strip by hot rolling, characterized in that the hot strip (B) after hot rolling for targeted temperature control in a first step of a predetermined temperature / time cycle within a predetermined period to a desired first temperature (T2, T3, T4), is kept constant at this desired first temperature in a second step for a predetermined period of time and is brought to a desired final temperature (T1) within a predetermined period of time in a final step.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß das Warmband (B) in mindestens einem weiteren Schritt innerhalb eines vorgegebenen Zeitraumes auf eine gewünschte weitere Temperatur (T2', T3', T4') gebracht wird, in mindestens einem nachfolgenden Schritt während eines vorgegebenen Zeitraumes auf dieser gewünschten zweiten Temperatur konstant gehalten wird und in einem abschließenden Schritt innerhalb eines vorgegebenen Zeitraumes auf eine gewünschte Endtemperatur (T1) gebracht wird.3. The method according to claim 2, characterized in that the hot strip (B) is brought to a desired further temperature (T2 ' , T3 ' , T4 ' ) in at least one further step within a predetermined period, in at least one subsequent step during a predetermined period of time is kept constant at this desired second temperature and is brought to a desired final temperature (T1) in a final step within a predetermined period.
4. Verfahren nach Anspruch 2 und/oder 3, dadurch gekennzeichnet, daß die erste und/oder weitere Temperatur (T2, T3, T4) als Temperaturband mit Ober- und Untergrenzen vorgegeben wird/werden. 4. The method according to claim 2 and / or 3, characterized in that the first and / or further temperature (T2, T3, T4) is / are specified as a temperature band with upper and lower limits.
PCT/EP1999/003057 1998-05-13 1999-05-05 Method and system for producing a hot-rolled strip WO1999058731A1 (en)

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DE1998121299 DE19821299A1 (en) 1998-05-13 1998-05-13 Arrangement and method for producing hot-rolled steel strip
DE19821299.2 1998-05-13

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