EP0761325B1 - Method and installation for production of ferritic hot-rolled strip - Google Patents
Method and installation for production of ferritic hot-rolled strip Download PDFInfo
- Publication number
- EP0761325B1 EP0761325B1 EP96113056A EP96113056A EP0761325B1 EP 0761325 B1 EP0761325 B1 EP 0761325B1 EP 96113056 A EP96113056 A EP 96113056A EP 96113056 A EP96113056 A EP 96113056A EP 0761325 B1 EP0761325 B1 EP 0761325B1
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- European Patent Office
- Prior art keywords
- rolling
- stand
- strip
- cooling
- hot
- 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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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 238000009434 installation Methods 0.000 title abstract 2
- 238000005096 rolling process Methods 0.000 claims abstract description 68
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000004804 winding Methods 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 2
- 238000005097 cold rolling Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000047 product Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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
-
- 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
- B21B1/22—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
- B21B1/28—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 cold-rolling, e.g. Steckel cold 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
- B21B1/466—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
- B21B2201/00—Special rolling modes
- B21B2201/04—Ferritic rolling
Definitions
- the invention relates to a production plant for the production of hot-rolled flat products, consisting of a multi-stand Rolling mill, an outfeed roller table with facilities for cooling the Hot strip and with downstream winding machines for winding of the tape.
- Rolling plants for the production of hot-rolled strips are today in the generally designed and operated so that the deformation in the individual scaffolding is austenitic, which means that it is ensured that the rolling temperatures in the individual rolling stands lie above the GOS line of the iron carbon diagram.
- First after the last rolling pass, which is used to achieve a fine-grained Final structure should be as close as possible to the GOS line cooling to the reel temperature with structural change in the Cooling section or in the wound bundle.
- the final rolling temperature for rolling that means the temperature in the last mill stand Rolling mill at 840 to 920 ° C depending on the level of carbon.
- the final rolling temperature is maintained by selecting the final rolling speed, with which the natural cooling of the tape in the Rolling mill and the heat supply by the drive power of the Roll stands can be controlled.
- This procedure is straightforward applicable for strip thicknesses above a minimum strip thickness, each is of the order of 1.3 mm depending on the road type. Will this Strip thickness is undershot, the required rolling speed is reached with values above 12 m per second, not in the free run on the roller table behind the rolling mill can be mastered more.
- a preferred method sees pre-rolling in austenitic Range up to an intermediate thickness of 2 to 8 mm and one finish roll in the ferritic range to the lowest final thicknesses below of 1.3 mm in front.
- the rolling stock must be between the two process stages from the final rolling temperature in the austenitic range to the rolling temperature be cooled in the ferritic range. This means one Cooling from the temperature range of 840 to 920 ° C to the Temperature range from 600 to 780 ° C.
- the finish rolling temperature is after the second deformation stage also in the range of 600 to 780 ° C and thus on the order of magnitude, in which recrystallization of the Structure occurs in the wound bundle.
- a structure is created which means the use of the product without further cold forming or Allows heat treatment.
- the process described above is implemented in one conventionally designed hot strip mill considerable difficulties.
- the transition from austenitic to ferritic Forming should be carried out in the thickness range from 2 to 8 mm, that is, in a thickness range in which the rolling stock is roughly in in the middle of a conventional finishing train. Because the lead time from scaffolding to scaffolding at this point only a few seconds is, in principle, it is possible to implement cooling, however, adherence to the time required for the conversion cannot be realized. Carrying out ferritic rolling according to the method described is conventional for that designed hot strip mill impossible.
- EP-A-226 446 which also belongs to the prior art a production plant for the production of hot-rolled flat products described with a final thickness of 2 to 6 mm.
- the production plant is at very high speeds, namely not rolled less than 1,500 m / min. That in this production facility
- the end product produced has in no way a structure that is similar to a cold rolled product.
- Essential objective this previously known production facility is the increase in throughput and the production of a rolled product with good properties for further treatment.
- the rolled product itself is not of too high quality.
- a process is known from EP-A2-0 524 162 known for rolling out hot strip to a thickness of 0.5 to 2 mm, in a last roll stand, the steel at or below 750 ° is rolled out and this rolling temperature by roller cooling in last scaffold is set.
- From the German published application 1 903 554 is a process for producing hot rolled Strip steel is known, being after a conventional hot rolling steel strip on a normal hot rolling mill similar to the document EP-A2-0 524 162 an additional Hot rolling operation at below 700 ° C follows. An austenitic Rolling process and / or a ferritic rolling process is with this previously known methods not possible.
- the object of the invention therein, a production plant for the ferritic rolling of hot strip to create with the aforementioned disadvantages and problems be eliminated.
- the object of the invention is also a method To provide with the finishing rolling of hot strip in ferritic Range is easily enabled.
- the task is solved in a production plant of type mentioned with the invention in that in the rolling direction seen behind the winding machines for continuous passage an additional compact forming stage in the form of a single or Multi-stand rolling mill arranged for rolling thin strips is and that the first multi-stand rolling mill seen in the rolling direction for rolling in the austenitic temperature range and seen in the rolling direction second single or multi-stand rolling mill can be used for rolling in the ferritic temperature range and that the cooling device for cooling the hot strip the austenitic in the ferritic temperature range in the range of the roller table is arranged between the two rolling mills (cf. Figure).
- This rolling mill is specially designed for ferritic forming Area designed. This includes equipping with work roll diameters of less than 500 mm and with positioning and Control loops to achieve strip tolerances for thickness and flatness, as required by cold rolled products.
- the conventional process takes over the entire rolling process designed hot strip mill 3 to create an intermediate thickness through rolling in the austenitic area and the compact ferritic Forming stage 6 the final rolling in the ferritic range.
- the cooling of the strip with intermediate thickness from the austenitic area in the The ferritic range occurs in the simplest way when passing through the run-out roller table 4 between the austenitic forming step 3 and the ferritic forming stage 6. Due to the length of this Roller table, which is used for cooling austenitic rolled strips Reel temperature is to be designed, lead times result in the case of ferritic rolling, the cooling normally required and ensure the conversion of austenite to ferrite.
- the for the austenitic rolling process existing cooling devices 9 can, if necessary, in addition to achieving the required Cooling rate can be used. Should the lead time of the last austenitic transformation 3.1 to the first ferritic Forming 6.1 for a sufficient conversion of austenite into Ferrite will not be sufficient, so a heated loop storage (not shown) provided the immediately between the conventional coiler 5 and the compact ferritic Forming stage 6 is to be arranged.
- the hot strip production plant shown in the single figure 1 for austenitic and ferritic rolling is before the first multi-stand mill 3 a roughing mill, not shown 12 or a thin slab furnace with casting machine 13 upstream.
- the invention results in an overall system concept, which in optimally both the austenitic process and the allows ferritic rolling process.
Abstract
Description
Die Erfindung betrifft eine Produktionsanlage zur Erzeugung von warmgewalzten Flachprodukten, bestehend aus einer mehrgerüstigen Walzstraße, einem Auslaufrollgang mit Einrichtungen zur Kühlung des Warmbandes und mit nachgeordneten Wickelmaschinen zum Aufwickeln des Bandes.The invention relates to a production plant for the production of hot-rolled flat products, consisting of a multi-stand Rolling mill, an outfeed roller table with facilities for cooling the Hot strip and with downstream winding machines for winding of the tape.
Walzanlagen zur Erzeugung warmgewalzter Bänder werden heute im allgemeinen so ausgelegt und betrieben, daß die Umformung in den einzelnen Gerüsten austenitisch erfolgt, das heißt, es wird sichergestellt, daß die Walztemperaturen in den einzelnen Walzgerüsten oberhalb der GOS-Linie des Eisenkohlenstoffdiagramms liegen. Erst nach dem letzten Walzstich, der zur Erzielung eines feinkörnigen Endgefüges möglichst nahe an der GOS-Linie liegen sollte, erfolgt die Abkühlung auf die Haspeltemperatur mit Gefügeumwandlung in der Kühlstrecke bzw. im gewickelten Bund.Rolling plants for the production of hot-rolled strips are today in the generally designed and operated so that the deformation in the individual scaffolding is austenitic, which means that it is ensured that the rolling temperatures in the individual rolling stands lie above the GOS line of the iron carbon diagram. First after the last rolling pass, which is used to achieve a fine-grained Final structure should be as close as possible to the GOS line cooling to the reel temperature with structural change in the Cooling section or in the wound bundle.
Für Stähle mit einem Kohlenstoffgehalt von weniger als 0,2 % liegt für die Walzung nach dem oben beschriebenen Verfahren die Endwalztemperatur, das heißt die Temperatur im letzten Walzgerüst der Walzstraße je nach Höhe des Kohlenstoffgehalts bei 840 bis 920 °C. Die Einhaltung der Endwalztemperatur erfolgt durch Wahl der Endwalzgeschwindigkeit, mit der die natürliche Abkühlung des Bandes in der Walzstraße und die Wärmezufuhr durch die Antriebsleistung der Walzgerüste gesteuert werden kann. Dieses Verfahren ist problemlos anwendbar für Banddicken oberhalb einer Mindestbanddicke, die je nach Straßentyp in der Größenordnung von 1,3 mm liegt. Wird diese Banddicke unterschritten, so erreicht die erforderliche Walzgeschwindigkeit mit Werten oberhalb von 12 m pro Sekunde eine Höhe, die im freien Auslauf auf dem Rollgang hinter der Walzstraße nicht mehr beherrscht werden kann.For steels with a carbon content of less than 0.2% the final rolling temperature for rolling according to the method described above, that means the temperature in the last mill stand Rolling mill at 840 to 920 ° C depending on the level of carbon. The final rolling temperature is maintained by selecting the final rolling speed, with which the natural cooling of the tape in the Rolling mill and the heat supply by the drive power of the Roll stands can be controlled. This procedure is straightforward applicable for strip thicknesses above a minimum strip thickness, each is of the order of 1.3 mm depending on the road type. Will this Strip thickness is undershot, the required rolling speed is reached with values above 12 m per second, not in the free run on the roller table behind the rolling mill can be mastered more.
Die ungeachtet dieser Problematik vorhandene Entwicklungstendenz in Richtung geringerer Enddicken hat dazu geführt, daß nach Wegen gesucht wurde, die Endwalztemperatur abzusenken, um damit geringere Walzgeschwindigkeiten zu ermöglichen. Solche Walzprozesse wurden unter der Bezeichnung ferritisches Walzen bekannt, da sie bei Temperaturen unterhalb der GOS-Linie, das heißt im Bereich der α ,γ-Mischkristalle oder unterhalb der GPS-Linie im ferritischen Bereich erfolgen.The development tendency existing despite this problem in the direction of lower final thicknesses has led to ways was sought to lower the finish rolling temperature to lower it To enable rolling speeds. Such rolling processes were Known under the name ferritic rolling, because they are Temperatures below the GOS line, i.e. in the area of the α , γ mixed crystals or below the GPS line in the ferritic Area.
Ein bevorzugtes Verfahren sieht eine Vorwalzung im austenitischen Bereich bis auf eine Zwischendicke von 2 bis 8 mm und eine Fertigwalzung im ferritischen Bereich auf geringste Enddicken unterhalb von 1,3 mm vor. Zwischen den beiden Prozeßstufen muß das Walzgut von der Endwalztemperatur im austenitischen Bereich auf die Walztemperatur im ferritischen Bereich abgekühlt werden. Dies bedeutet eine Abkühlung aus dem Temperaturbereich von 840 bis 920 °C auf den Temperaturbereich von 600 bis 780 °C.A preferred method sees pre-rolling in austenitic Range up to an intermediate thickness of 2 to 8 mm and one finish roll in the ferritic range to the lowest final thicknesses below of 1.3 mm in front. The rolling stock must be between the two process stages from the final rolling temperature in the austenitic range to the rolling temperature be cooled in the ferritic range. This means one Cooling from the temperature range of 840 to 920 ° C to the Temperature range from 600 to 780 ° C.
Die Endwalztemperatur hinter der zweiten Verformungsstufe liegt ebenfalls im Bereich von 600 bis 780 °C und damit in einer Größenordnung, bei der nach dem Aufhaspeln eine Rekristallisation des Gefüges im gewickelten Bund eintritt. Es entsteht ein Gefüge, welches die Verwendung des Produktes ohne weitere Kaltumformung oder Wärmebehandlung ermöglicht.The finish rolling temperature is after the second deformation stage also in the range of 600 to 780 ° C and thus on the order of magnitude, in which recrystallization of the Structure occurs in the wound bundle. A structure is created which means the use of the product without further cold forming or Allows heat treatment.
Wesentliche Voraussetzung für ein gutes Ergebnis ist die Einhaltung einer Mindestkühlzeit für die Abkühlung aus dem austenitischen Gebiet in das ferritische Gebiet. Damit die Umwandlung von Austenit in Ferrit in ausreichendem Maße erfolgen kann, muß diese Mindestkühlzeit eingehalten werden. Diese liegt je nach gewählter Temperatur für den Eintritt in die erste ferritische Umformung bei 10 bis 200 Sekunden.Compliance is essential for a good result a minimum cooling time for cooling from the austenitic Area in the ferritic area. So that the transformation of austenite sufficient cooling in ferrite, this minimum cooling time be respected. This lies depending on the selected temperature for entry into the first ferritic transformation at 10 to 200 seconds.
Die Realisierung des oben beschriebenen Prozesses bereitet in einer konventionell gestalteten Warmbreitbandstraße erhebliche Schwierigkeiten. Der Übergang von der austenitischen in die ferritische Umformung soll im Dickenbereich von 2 bis 8 mm vorgenommen werden, das heißt in einem Dickenbereich, bei dem sich das Walzgut etwa in der Mitte einer konventionellen Fertigstraße befindet. Da die Durchlaufzeit von Gerüst zu Gerüst an dieser Stelle nur wenige Sekunden beträgt, ist eine Realisierung der Kühlung zwar prinzipiell möglich, jedoch kann die Einhaltung der geforderten Zeit für die Umwandlung nicht realisiert werden. Die Durchführung des ferritischen Walzens nach der beschriebenen Methode wird damit für die konventionell gestaltete Warmbreitbandstraße unmöglich.The process described above is implemented in one conventionally designed hot strip mill considerable difficulties. The transition from austenitic to ferritic Forming should be carried out in the thickness range from 2 to 8 mm, that is, in a thickness range in which the rolling stock is roughly in in the middle of a conventional finishing train. Because the lead time from scaffolding to scaffolding at this point only a few seconds is, in principle, it is possible to implement cooling, however, adherence to the time required for the conversion cannot be realized. Carrying out ferritic rolling according to the method described is conventional for that designed hot strip mill impossible.
In der ebenfalls zum Stand der Technik zählenden EP-A-226 446 ist eine Produktionsanlage zur Erzeugung von warmgewalzten Flachprodukten mit einer Enddicke von 2 bis 6 mm beschrieben. In der Produktionsanlage wird mit sehr hohen Geschwindigkeiten, nämlich nicht weniger als 1.500 m/min gewalzt. Das in dieser Produktionsanlage erzeugte Endprodukt hat auf keinen Fall eine Gefügestruktur, die einem kaltgewalzten Produkt ähnlich ist. Wesentliche Zielsetzung dieser vorbekannten Produktionsanlage ist die Erhöhung des Durchsatzes und die Erzeugung eines Walzproduktes mit guten Eigenschaften zur Weiterbehandlung. Das Walzprodukt selber ist allerdings nicht von allzu hoher Qualität. Aus der EP-A2-0 524 162 ist ein Verfahren zum Auswalzen von Warmband auf eine Dicke von 0,5 bis 2 mm bekannt, wobei in einem letzten Walzgerüst der Stahl bei oder unterhalb 750° ausgewalzt wird und diese Walztemperatur durch Walzenkühlung im letzten Gerüst eingestellt wird. Aus der deutschen Offenlegungsschrift 1 903 554 ist ein Verfahren zur Herstellung von warmgewalztem Bandstahl bekannt, wobei nach einem konventionellen Warmwalzen des Bandstahls auf einer normalen Fertigstraße für Warmwalzen ähnlich wie bei dem Dokument EP-A2-0 524 162 ein zusätzlicher Warmwalzarbeitsgang bei unter 700 °C folgt. Ein austenitischer Walzprozeß und/oder ein ferritischer Walzprozeß ist mit diesem vorbekannten Verfahren nicht möglich.EP-A-226 446, which also belongs to the prior art a production plant for the production of hot-rolled flat products described with a final thickness of 2 to 6 mm. In the production plant is at very high speeds, namely not rolled less than 1,500 m / min. That in this production facility The end product produced has in no way a structure that is similar to a cold rolled product. Essential objective this previously known production facility is the increase in throughput and the production of a rolled product with good properties for further treatment. However, the rolled product itself is not of too high quality. A process is known from EP-A2-0 524 162 known for rolling out hot strip to a thickness of 0.5 to 2 mm, in a last roll stand, the steel at or below 750 ° is rolled out and this rolling temperature by roller cooling in last scaffold is set. From the German published application 1 903 554 is a process for producing hot rolled Strip steel is known, being after a conventional hot rolling steel strip on a normal hot rolling mill similar to the document EP-A2-0 524 162 an additional Hot rolling operation at below 700 ° C follows. An austenitic Rolling process and / or a ferritic rolling process is with this previously known methods not possible.
Bei diesem Stand der Technik besteht die Aufgabe der Erfindung darin, eine Produktionsanlage für das ferritische Walzen von Warmband zu schaffen, mit der die zuvor genannten Nachteile und Probleme beseitigt werden. Aufgabe der Erfindung ist auch ein Verfahren bereitzustellen, mit dem ein Fertigwalzen von Warmband im ferritischen Bereich problemlos ermöglicht wird.In this prior art, the object of the invention therein, a production plant for the ferritic rolling of hot strip to create with the aforementioned disadvantages and problems be eliminated. The object of the invention is also a method To provide with the finishing rolling of hot strip in ferritic Range is easily enabled.
Die Lösung der Aufgabe gelingt bei einer Produktionsanlage der eingangs genannten Art mit der Erfindung dadurch, daß in Walzrichtung gesehen hinter den Wickelmaschinen zum kontinuierlichen Durchgang eine zusätzlich kompakte Umformstufe in Form eines ein- oder mehrgerüstigen Walzwerks für das Walzen dünner Bänder angeordnet ist und daß die in Walzrichtung gesehen erste mehrgerüstige Walzstraße für die Walzung im austenitischen Temperaturbereich und die in Walzrichtung gesehen zweite ein- oder mehrgerüstige Walzstraße für die Walzung im ferritischen Temperaturbereich einsetzbar ist und daß die Abkühleinrichtung für die Kühlung des Warmbandes aus dem austenitischen in den ferritischen Temperaturbereich im Bereiche des Rollganges zwischen den beiden Walzstraßen angeordnet ist (vgl. Figur). Diese Walzstraße ist speziell für die Umformung im ferritischen Gebiet gestaltet. Hierzu gehört u.a. die Ausrüstung mit Arbeitswalzendurchmessern von weniger als 500 mm sowie mit Stell- und Regelkreisen zur Erzielung von Bandtoleranzen für Dicke und Planheit, wie sie von Kaltwalzprodukten gefordert werden. The task is solved in a production plant of type mentioned with the invention in that in the rolling direction seen behind the winding machines for continuous passage an additional compact forming stage in the form of a single or Multi-stand rolling mill arranged for rolling thin strips is and that the first multi-stand rolling mill seen in the rolling direction for rolling in the austenitic temperature range and seen in the rolling direction second single or multi-stand rolling mill can be used for rolling in the ferritic temperature range and that the cooling device for cooling the hot strip the austenitic in the ferritic temperature range in the range of the roller table is arranged between the two rolling mills (cf. Figure). This rolling mill is specially designed for ferritic forming Area designed. This includes equipping with work roll diameters of less than 500 mm and with positioning and Control loops to achieve strip tolerances for thickness and flatness, as required by cold rolled products.
Im Gesamtablauf des Walzprozesses übernimmt die konventionell
gestaltete Warmbreitbandstraße 3 die Erzeugung einer Zwischendicke
durch Walzung im austenitischen Bereich und die kompakte ferritische
Umformstufe 6 die Endwalzung im ferritischen Bereich. Die Abkühlung
des Bandes mit Zwischendicke aus dem austenitischen Bereich in den
ferritischen Bereich erfolgt in einfachster Weise beim Durchlaufen
des Auslaufrollganges 4 zwischen der austenitischen Umformstufe 3
und der ferritischen Umformstufe 6. Bedingt durch die Länge dieses
Rollganges, der für die Kühlung austenitisch gewalzter Bänder auf
Haspeltemperatur auszulegen ist, ergeben sich Durchlaufzeiten, die
bei ferritischer Walzung im Normalfall die erforderliche Abkühlung
und die Umwandlung von Austenit in Ferrit sicherstellen. Die für
den austenitischen Walzprozess vorhandenen Kühleinrichtungen 9
können erforderlichenfalls zusätzlich zur Erzielung der erforderlichen
Abkühlrate herangezogen werden. Sollte die Durchlaufzeit von
der letzten austenitischen Umformung 3.1 bis zur ersten ferritischen
Umformung 6.1 für eine ausreichende Umwandlung von Austenit in
Ferrit nicht ausreichend sein, so wird ein beheizter Schlingenspeicher
(nicht dargestellt) vorgesehen, der unmittelbar zwischen
der konventionellen Haspelanlage 5 und der kompakten ferritischen
Umformstufe 6 anzuordnen ist.The conventional process takes over the entire rolling process
designed
Unmittelbar hinter der kompakten ferritischen Umformstufe 6 werden
speziell für das Wickeln von Dünnband 7 gestaltete Haspel 8 angeordnet.
Da für die örtlichen Gegebenheiten nicht mehr die Belange
dickerer Bänder berücksichtigt werden müssen, ist die Konstruktion
solcher Einrichtungen problemlos möglich.Immediately behind the compact ferritic forming
Der in der einzigen Figur dargestellten Warmbandproduktionsanlage
1 für austenitisches und ferritisches Walzen ist vor der ersten
mehrgerüstigen Walzstraße 3 eine nicht näher dargestellte Vorstraße
12 oder ein Dünnbrammenofen mit Gießmaschine 13 vorgeordnet.The hot strip production plant shown in the single figure
1 for austenitic and ferritic rolling is before the first
multi-stand mill 3 a roughing mill, not shown
12 or a thin slab furnace with
Mit der Erfindung ergibt sich ein Gesamtanlagenkonzept, welches in optimaler Weise sowohl den austenitischen Prozeß als auch den ferritischen Walzprozeß zuläßt.The invention results in an overall system concept, which in optimally both the austenitic process and the allows ferritic rolling process.
Claims (6)
- Production plant (1) for production of hot-rolled flat products (2, 7) consisting of a multi-stand rolling train (3), an outlet roller path (4) with devices (9) for cooling of the hot strip and downstream coiling machines (15) for winding up the strip, wherein an additional compact reshaping stage (6) in the form of a single-stand or multi-stand rolling mill for the rolling of thin strips (7) is arranged behind the coiling machines (5), as seen in rolling direction (14), for continuous transit, and that the first multi-stand rolling train (3) as seen in rolling direction (14) is usable for rolling in the austenitic temperature range and the second single-stand or multi-stand rolling train (6) as seen in rolling direction (14) is usable for rolling in the ferritic temperature range and the cooling device (9) for cooling the hot strip (2) from the austenitic to the ferritic temperature range is arranged in the region of the cooling roller path (4) between the two rolling trains (3, 6), wherein in addition the diameter of the working rolls (10) of the second stand group (6) is less than 800 mm, preferably less than 400 mm, and the second stand group (6) for the rolling of the hot strip (2) in the ferrite temperature range is equipped with setting and regulating circuits for attainment of strip tolerances for thickness and planarity as in cold rolling stands.
- Production plant according to claim 1, characterised in that special coiling machines (8) for winding up thin strips (7) are arranged directly behind the compact reshaping stage (6).
- Production plant according to claim 1 or 2, characterised in that a heated storage device is provided directly in front of the second single-stand or multi-stand rolling train (6).
- Production plant according to at least one of claims 1 to 3, characterised in that the roll stands of the compact reshaping stage (6) are constructed as a four-high stand (6.1) or six-high stand (6.2).
- Production plant according to at least one of claims 1 to 4, characterised in that in the case of use of working roll diameters less than 400 mm the working rolls (10) are drivable by way of the backing rolls (11) or by way of the intermediate rolls (14).
- Method of producing hot-rolled flat products by a production plant consisting of a multi-stand rolling train (3), an outlet roller path (4) with devices (9) for cooling of the hot strip and with downstream coiling machines (5) for winding up the strip, according to at least one of the preceding claims 1 to 7, characterised in that for the purpose of rolling the flat product in the austenitic and ferritic range a second stand group (6) is arranged downstream of the coiling machine (5) and that the two roll stand groups (3, 6) continuously work together in the manner that parts of a hot strip (2) are simultaneously disposed in both stand groups (3, 6), wherein in the first stand group (3) the hot strip (2) is reshaped in the austenitic temperature range and subsequently the hot strip (2) is reshaped in the second stand group (6) in the ferrite temperature range.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19531538 | 1995-08-25 | ||
| DE19531538A DE19531538A1 (en) | 1995-08-25 | 1995-08-25 | Hot strip production plant for ferritic rolling and method for producing ferritic rolled strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0761325A1 EP0761325A1 (en) | 1997-03-12 |
| EP0761325B1 true EP0761325B1 (en) | 2001-11-28 |
Family
ID=7770535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96113056A Expired - Lifetime EP0761325B1 (en) | 1995-08-25 | 1996-08-14 | Method and installation for production of ferritic hot-rolled strip |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US5771731A (en) |
| EP (1) | EP0761325B1 (en) |
| JP (1) | JP3883614B2 (en) |
| KR (1) | KR100424528B1 (en) |
| CN (1) | CN1081961C (en) |
| AT (1) | ATE209537T1 (en) |
| CA (1) | CA2183950C (en) |
| DE (2) | DE19531538A1 (en) |
| ES (1) | ES2169184T3 (en) |
| MY (1) | MY118124A (en) |
| RU (1) | RU2179083C2 (en) |
| TW (1) | TW311890B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1290743B1 (en) * | 1997-04-10 | 1998-12-10 | Danieli Off Mecc | LAMINATION PROCESS FOR FLAT PRODUCTS WITH THIN THICKNESSES AND RELATED ROLLING LINE |
| GB2327375A (en) * | 1997-07-21 | 1999-01-27 | Kvaerner Metals Cont Casting | Continuous metal manufacturing method and apparatus therefore |
| DE19758108C1 (en) * | 1997-12-17 | 1999-01-14 | Mannesmann Ag | Method and installation for continuous production of hot rolled thin flat products |
| DE19903926A1 (en) * | 1999-02-01 | 2000-08-03 | Sms Demag Ag | Process and plant for forming metal strips |
| FR2792857B1 (en) * | 1999-04-28 | 2001-07-27 | Kvaerner Metals Clecim | PROCESS FOR THE CONTINUOUS MANUFACTURE OF A METAL STRIP |
| US20050115649A1 (en) * | 2003-03-27 | 2005-06-02 | Tokarz Christopher A. | Thermomechanical processing routes in compact strip production of high-strength low-alloy steel |
| EP2301684A1 (en) | 2009-09-24 | 2011-03-30 | Siemens Aktiengesellschaft | Welding method with optimised strain protection |
| AT509707B1 (en) * | 2010-05-04 | 2011-11-15 | Siemens Vai Metals Tech Gmbh | METHOD FOR HOT ROLLING OF STEEL STRIPS AND HOT ROLLING STRIP |
| CN106391710B (en) * | 2016-09-27 | 2018-07-31 | 武汉钢铁有限公司 | The production method and control device of thin slab continuous casting and rolling producing line be pilot |
| CN113996651A (en) * | 2021-10-29 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Low-carbon steel and manufacturing method for improving performance uniformity of low-carbon steel rolled by ferrite in CSP process |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2000642B1 (en) * | 1968-01-24 | 1973-04-06 | Sumitomo Metal Ind | |
| DE2613459A1 (en) * | 1976-03-30 | 1977-10-13 | Schloemann Siemag Ag | Arrangement for avoiding scrap in a rolling mill - for wide strip material, during break down of the prodn. line and/or the strip winding arrangement |
| US4793401A (en) * | 1985-12-12 | 1988-12-27 | Kawasaki Steel Corporation | Method of producing thin steel sheets having an improved processability |
| JPS62230403A (en) * | 1985-12-12 | 1987-10-09 | Kawasaki Steel Corp | Thin steel sheet producing installation train |
| JPH0446608A (en) * | 1990-06-12 | 1992-02-17 | Kawasaki Steel Corp | Multistage hot rolling mill |
| US5133205A (en) * | 1990-11-13 | 1992-07-28 | Mannesmann Aktiengesellschaft | System and process for forming thin flat hot rolled steel strip |
| EP0524162B1 (en) * | 1991-07-17 | 1998-11-11 | CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif | Method of manufacturing a thin sheet of low carbon steel |
| JPH0655202A (en) * | 1992-08-07 | 1994-03-01 | Kawasaki Steel Corp | Method for rolling warm rolled strip |
| EP0625383B1 (en) * | 1993-05-17 | 1998-02-25 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Line to produce strip and/or sheet |
-
1995
- 1995-08-25 DE DE19531538A patent/DE19531538A1/en not_active Ceased
-
1996
- 1996-07-11 TW TW085108393A patent/TW311890B/zh active
- 1996-08-14 DE DE59608302T patent/DE59608302D1/en not_active Expired - Lifetime
- 1996-08-14 ES ES96113056T patent/ES2169184T3/en not_active Expired - Lifetime
- 1996-08-14 EP EP96113056A patent/EP0761325B1/en not_active Expired - Lifetime
- 1996-08-14 AT AT96113056T patent/ATE209537T1/en active
- 1996-08-19 JP JP21748696A patent/JP3883614B2/en not_active Expired - Fee Related
- 1996-08-22 CA CA002183950A patent/CA2183950C/en not_active Expired - Fee Related
- 1996-08-22 US US08/704,005 patent/US5771731A/en not_active Expired - Lifetime
- 1996-08-23 CN CN96112270A patent/CN1081961C/en not_active Expired - Fee Related
- 1996-08-23 RU RU96117004/02A patent/RU2179083C2/en not_active IP Right Cessation
- 1996-08-23 KR KR1019960034992A patent/KR100424528B1/en not_active IP Right Cessation
- 1996-08-23 MY MYPI96003478A patent/MY118124A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09122708A (en) | 1997-05-13 |
| EP0761325A1 (en) | 1997-03-12 |
| CN1153685A (en) | 1997-07-09 |
| KR100424528B1 (en) | 2004-05-20 |
| CA2183950C (en) | 2007-04-24 |
| TW311890B (en) | 1997-08-01 |
| CA2183950A1 (en) | 1997-02-26 |
| DE59608302D1 (en) | 2002-01-10 |
| CN1081961C (en) | 2002-04-03 |
| KR19980015600A (en) | 1998-05-25 |
| JP3883614B2 (en) | 2007-02-21 |
| ATE209537T1 (en) | 2001-12-15 |
| DE19531538A1 (en) | 1997-02-27 |
| US5771731A (en) | 1998-06-30 |
| RU2179083C2 (en) | 2002-02-10 |
| MY118124A (en) | 2004-09-30 |
| ES2169184T3 (en) | 2002-07-01 |
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