EP2379244B1 - Method and device for descaling a metal strip - Google Patents

Method and device for descaling a metal strip Download PDF

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Publication number
EP2379244B1
EP2379244B1 EP09799265.5A EP09799265A EP2379244B1 EP 2379244 B1 EP2379244 B1 EP 2379244B1 EP 09799265 A EP09799265 A EP 09799265A EP 2379244 B1 EP2379244 B1 EP 2379244B1
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EP
European Patent Office
Prior art keywords
flat products
nozzles
train
edges
strip edges
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Not-in-force
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EP09799265.5A
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German (de)
French (fr)
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EP2379244A2 (en
Inventor
Hans-Jürgen Bender
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SMS Siemag AG
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SMS Siemag AG
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Classifications

    • 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
    • B21B45/04—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 for de-scaling, e.g. by brushing
    • B21B45/08—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 for de-scaling, e.g. by brushing hydraulically
    • 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
    • B21B1/224—Edge rolling of flat products
    • 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
    • B21B1/30—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 non-continuous process
    • B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/06—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged vertically, e.g. edgers

Definitions

  • the invention relates to a method for producing flat products made of steel from continuously cast slabs of large or medium thickness or thin strands, which are compressed and then undergo a roughing and a finishing train.
  • a process is known by rolling the thin strip of carbon steels or alloyed temper or temper steels in two stages with a break for intermediate cooling by reversing on the roller table to one or more pre-ribbons.
  • the Vorb be heated by the combined effect of the covers and the heater to a defined temperature over the length and width and rolled in the multi-stand finishing line in the two-phase area (austenite ferrite) to thin, high-strength finished tapes, which is due to the lying in the upper Austenit capable rolling temperature the first forming step in the roughing train at a total decrease of 40 to 70%, the continuous cast structure is converted into a rolling structure by complete recrystallization.
  • the transformation start temperature of the transition into the two-phase region is raised and, in order to lower the forming resistances, the conversion time is shortened.
  • the Vorband is uniform over its length and width by the combined effect of the closed covers and an inductive heating device to a targeted Temperature adjusted so that rolling takes place in the finishing mill for all stitches in the two-phase area.
  • the tinder scrubber is mounted in the rolling direction behind the roughing train and immediately before the finishing train and serves for descaling the surfaces, not the edges of the slabs.
  • a hot rolling method in which a compression device is provided for the lateral upsetting of the rolled strip in front of the roughing stand.
  • a descaling device is provided between the upsetting device and the roughing stand, by which the continuous casting slabs are descaled on their surfaces by water jets. Therefore, shielding plates are attached to the upsetting device on both side upsetting rollers to prevent the water of the descaling device from cooling the rolled strip at the sides.
  • the shield plates are attached to lateral guides, so that changes with a change in the bandwidth and the distance of the shielding plates to the rolled strip.
  • the EP 1 305 102 B1 describes a production process and a plant for the production of thin flat products with a scale scrubber for descaling the top and bottom a continuous casting slab.
  • the flat products are descaled once again at their strip edges after passing through the roughing train and before passing through the finishing train. Then they can be upset again.
  • At least one high-pressure water jet is directed onto the flat products at an angle of 60 ° to 90 ° relative to the lateral surface of the flat products, in particular at an angle of 75 °.
  • the Entzu mattersstation before the roughing water jets are preferably directed to the band edges of three superimposed nozzles.
  • the invention also relates to a rolling mill for producing flat steel products from continuously or substantially thick slabs of medium or thin strands with a first upsetting device, a roughing train and a finishing train.
  • the rolling train is characterized in that a first descaling device for descaling the strip edges of the flat products is arranged in front of the first stuffing device, that a first descaling device for descaling the strip edges of the flat products is arranged in front of the first stuffing device, that the first descaling device at both strip edges of the flat products each having a plurality of directed to the band edges nozzles, in particular three nozzles, and that the nozzles are attached to the side guides of the rolling train to the upsetting device facing the ends of the side guides and are width-adjustable together with the side guides.
  • the attachment of the nozzles to the side guides has the advantage that the distance of the nozzles to the band edge is always constant, provided that the side guides or rulers are always moved out to the band edges (which is always the case in practice).
  • the constant distance between the nozzles and the strip edge advantageously produces a constant force impulse of the water jet from the nozzles onto the strip edges and thus a uniform descaling effect.
  • the nozzles are attached to the rulers of the side guides and width adjustable together with the rulers.
  • a second upsetting device can be provided in front of the finishing train, and in front of this a second descaling device for descaling the strip edges of the flat products.
  • the nozzles radiate the fluid respectively at an angle of 60 ° to 90 °, based on the lateral surface of the flat products, in particular at an angle of 75 °, on the band edges of the flat products.
  • a rolling train for example, downstream of a casting machine for producing large or medium-sized continuous slabs, comprises a pair of scissors for dividing the cast strand into slabs, a heating or equalizing furnace for heating the cold or warm continuously cast slabs or for balancing the thin strands to rolling start temperature and before a compression device 1 (FIG. Fig. 2 ) for laterally compressing the flat products a Entzu concerningsvorrichung 2 ( Fig. 1 . 2 ) for descaling the lateral strip edges of the flat products, wherein the compression device 1 in turn is arranged in front of the roughing train.
  • the flat products or ribbons are conveyed via rollers 3.
  • At their two longitudinal edges of the flat products are guided by rulers 4, 5, depending on the width of the flat products at different positions. This requires that the two rulers 4, 5, are arranged symmetrically to the center in the direction of a double arrow A transversely to the rolling direction of the flat products slidably.
  • three spray nozzles 6a, 6b, 6c and 7a, 7b and 7c are arranged for spraying high-pressure water jets on the strip edges of the rolled strip. From each of the nozzles 6a, 6b, 6c, 7a, 7b and 7c, the water becomes conical blasted, covering the water jets to fully impact the side edges of the flat products and remove the scale.
  • a splash wall 8, 9 which is preferably fixed in position.
  • each flexible media chain 10 and 11 each having a high-pressure hose 12, 13 for supplying the water from a common supply line 14 inside.
  • the nozzles 6a, 6b, 6c and 7a, 7b and 7c are respectively integrated on both sides with spray bars 15, 16, which form the mechanically rigid end piece of the tubes 12, 13.
  • the spray bars 15, 16 are mounted on the rulers 4, 5 and movable with them.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Erzeugen von Flachprodukten aus Stahl aus stranggegossenen Brammen großer oder mittlerer Dicke oder aus Dünnsträngen, die gestaucht werden und die anschließend eine Vorstraße und eine Fertigstraße durchlaufen.The invention relates to a method for producing flat products made of steel from continuously cast slabs of large or medium thickness or thin strands, which are compressed and then undergo a roughing and a finishing train.

Durch ein Verfahren zum Erzeugen von Flachprodukten aus Stahl oder einem anderen Metall werden stranggegossene Brammen großer oder mittlerer Breite oder Dünnstränge in einer ein- oder mehrgerüstigen Vorstraße, einem Rollengang zum Transportieren der Flachprodukte und zum Reversieren behandelt. Das Verfahren vollzieht sich über einen mit klappbaren, wärmeisolierenden und mit Abdeckhauben versehenen Rollgangsabschnitt, eine induktive Erwärmungsvorrichtung zum geregelten Anwärmen von Vorbändern auf eine definierte Temperatur über die Vorbandlänge und -breite, in einer mehrgerüstigen Fertigstraße, mit einem Auslaufrollgang mit Einrichtungen zum Kühlen des Flachproduktes sowie in nachgeordneten Wickelmaschinen zum Aufwickeln des Fertigbandes.By a method of producing flat products of steel or other metal, continuously cast slabs of large or medium width or thin strands are treated in a single or multi-stand roughing train, a roller conveyor for transporting the flat products and for reversing. The process is carried out with a foldable, heat-insulating and provided with covers roller table section, an inductive heating device for the controlled heating of Vorbändern to a defined temperature over the Vorbandlänge and width, in a multi-stand finishing train, with a discharge roller table with means for cooling the flat product and in downstream winding machines for winding the finished strip.

Aus der EP 1 305 122 B1 ist ein Verfahren bekannt, durch das dünnes Band aus Kohlenstoffstählen oder legierte Einsatz- oder Vergütungsstähle zweistufig mit einer Pause zum Zwischenkühlen durch Reversieren auf dem Rollgang zu einem oder mehreren Vorbändern gewalzt werden. Die Vorbänder werden durch die kombinierte Wirkung der Abdeckhauben und der Erwärmungseinrichtung auf eine definierte Temperatur über die Länge und die Breite erwärmt und in der mehrgerüstigen Fertigstraße im Zweiphasengebiet (Austenit-Ferrit) zu dünnen, hochfesten Fertigbändern gewalzt, wobei durch die im oberen Austenitgebiet liegende Walztemperatur der ersten Umformstufe in der Vorstraße bei einer Gesamtabnahme von 40 bis 70 % das Stranggussgefüge in ein Walzgefüge durch vollständige Rekristallisation umgewandelt wird. Durch das feinkörnige und zum Teil verfestigte Gefüge wird die Umwandlungs-Starttemperatur des Übergangs in das Zweiphasengebiet angehoben und, um die Umformwiderstände zu senken, die Umwandlungszeit verkürzt. Je nach der Dicke und Lage des Vorbandes, der Dicke des Fertigbandes, der Einzugsgeschwindigkeit in die Fertigstraße und der Kühlwirkung eines Zunderwäschers vor der Fertigstraße wird das Vorband über seine Länge und Breite durch die kombinierte Wirkung der geschlossenen Abdeckhauben und einer induktiven Erwärmungseinrichtung gleichmäßig auf eine gezielte Temperatur so eingestellt, dass das Walzen in der Fertigstraße bei allen Stichen im Zweiphasengebiet erfolgt. Der Zunderwäscher ist in Walzrichtung hinter der Vorstraße und unmittelbar vor der Fertigstraße angebracht und dient zum Entzundern der Oberflächen, nicht der Kanten der Brammen.From the EP 1 305 122 B1 For example, a process is known by rolling the thin strip of carbon steels or alloyed temper or temper steels in two stages with a break for intermediate cooling by reversing on the roller table to one or more pre-ribbons. The Vorbänder be heated by the combined effect of the covers and the heater to a defined temperature over the length and width and rolled in the multi-stand finishing line in the two-phase area (austenite ferrite) to thin, high-strength finished tapes, which is due to the lying in the upper Austenitgebiet rolling temperature the first forming step in the roughing train at a total decrease of 40 to 70%, the continuous cast structure is converted into a rolling structure by complete recrystallization. Due to the fine-grained and partially solidified structure becomes the transformation start temperature of the transition into the two-phase region is raised and, in order to lower the forming resistances, the conversion time is shortened. Depending on the thickness and location of the pre-strip, the thickness of the finished strip, the feed rate in the finishing train and the cooling effect of a scale washer before the finishing line, the Vorband is uniform over its length and width by the combined effect of the closed covers and an inductive heating device to a targeted Temperature adjusted so that rolling takes place in the finishing mill for all stitches in the two-phase area. The tinder scrubber is mounted in the rolling direction behind the roughing train and immediately before the finishing train and serves for descaling the surfaces, not the edges of the slabs.

Aus der JP 07 047 419 A ist ein Warmwalzverfahren bekannt, in dem vor dem Vorgerüst eine Stauchvorrichtung zum seitlichen Stauchen des Walzbandes vorgesehen ist. In diesem Fall ist zwischen der Stauchvorrichtung und dem Vorgerüst eine Entzunderungsvorrichtung vorgesehen, durch die die Stranggussbrammen auf ihren Oberflächen durch Wasserstrahlen entzundert werden. Daher sind an der Stauchvorrichtung an beiden seitlichen Stauchwalzen Abschirmplatten angebracht, die verhindern sollen, dass das Wasser der Entzunderungsvorrichtung das Walzband an den Seiten abkühlt. Die Abschirmplatten sind an seitlichen Führungen angebracht, so dass sich mit einer Änderung der Bandbreite auch der Abstand der Abschirmplatten zu dem Walzband ändert.From the JP 07 047 419 A a hot rolling method is known in which a compression device is provided for the lateral upsetting of the rolled strip in front of the roughing stand. In this case, a descaling device is provided between the upsetting device and the roughing stand, by which the continuous casting slabs are descaled on their surfaces by water jets. Therefore, shielding plates are attached to the upsetting device on both side upsetting rollers to prevent the water of the descaling device from cooling the rolled strip at the sides. The shield plates are attached to lateral guides, so that changes with a change in the bandwidth and the distance of the shielding plates to the rolled strip.

Die EP 1 305 102 B1 beschreibt ein Produktionsverfahren und eine Anlage zur Erzeugung von dünnen Flachprodukten mit einem Zunderwäscher zum Entzundern der Oberseite und Unterseite eine Stranggussbramme.The EP 1 305 102 B1 describes a production process and a plant for the production of thin flat products with a scale scrubber for descaling the top and bottom a continuous casting slab.

Aus der JP 07 284 838 A ist eine Vorrichtung zum Entzundern der Bandkanten (Position 2, side edge descaler) bekannt, wobei ein Fluid über Düsen auf die Bandkante einwirkt.From the JP 07 284 838 A a device for descaling the strip edges (position 2, side edge descaler) is known, wherein a fluid acts on the strip edge via nozzles.

Es ist die Aufgabe der Erfindung, ein Verfahren zur Reinigung eines Metallbandes während der Herstellung zu schaffen, das gegenüber den aus dem Stand der Technik bekannten Verfahren verbessert ist.It is the object of the invention to provide a method for cleaning a metal strip during manufacture which is improved over the methods known from the prior art.

Gemäß der Erfindung wird diese Aufgabe durch ein Verfahren mit den Merkmalen von Anspruch 1 gelöst.According to the invention, this object is achieved by a method having the features of claim 1.

Ohne die Entzunderung der Bandkanten besteht die Gefahr, dass beim Stauchen der Zunder eingewalzt wird und damit die Qualität des Walzbandes beeinträchtigt wird. Durch die Erfindung wird diesem Nachteil des gemäß dem Stand der Technik gewalzten Bandes abgeholfen.Without the descaling of the strip edges, there is the danger that the scale will be rolled during upsetting and thus the quality of the rolled strip will be impaired. The invention remedies this drawback of the prior art rolled strip.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous developments of the invention will become apparent from the dependent claims.

Erfindungsgemäß wird mit Vorteil vorgesehen, dass die Flachprodukte nach dem Durchlaufen der Vorstraße und vor dem Durchlaufen der Fertigstraße ein weiteres Mal an ihren Bandkanten entzundert werden. Darauf können sie auch ein weiteres Mal gestaucht werden.According to the invention, it is advantageously provided that the flat products are descaled once again at their strip edges after passing through the roughing train and before passing through the finishing train. Then they can be upset again.

Um eine optimale Entzunderung zu erreichen, wird wenigstens ein Hochdruck-Wasserstrahl unter einem Winkel von 60° bis 90°, bezogen auf die seitliche Oberfläche der Flachprodukte, insbesondere unter einem Winkel von 75°, auf die Flachprodukte gerichtet. Im Falle der Anordnung der Entzunderungsstation vor der Vorstraße werden vorzugsweise aus drei übereinander angeordneten Düsen Wasserstrahlen auf die Bandkanten gerichtet.In order to achieve optimum descaling, at least one high-pressure water jet is directed onto the flat products at an angle of 60 ° to 90 ° relative to the lateral surface of the flat products, in particular at an angle of 75 °. In the case of the arrangement of the Entzunderungsstation before the roughing water jets are preferably directed to the band edges of three superimposed nozzles.

Die Erfindung bezieht sich auch auf eine Walzstraße zum Erzeugen von Flachprodukten aus Stahl aus stranggegossenen Brammen großer oder mittlerer Dicke oder aus Dünnsträngen mit einer ersten Stauchvorrichtung, einer Vorstraße und einer Fertigstraße.The invention also relates to a rolling mill for producing flat steel products from continuously or substantially thick slabs of medium or thin strands with a first upsetting device, a roughing train and a finishing train.

Erfindungsgemäß ist die Walzstraße dadurch gekennzeichnet, dass vor der ersten Stauchvorrichtung eine erste Entzunderungsvorrichtung zur Entzunderung der Bandkanten der Flachprodukte angeordnet ist, dass vor der ersten Stauchvorrichtung eine erste Entzunderungsvorrichtung zur Entzunderung der Bandkanten der Flachprodukte angeordnet ist, dass die erste Entzunderungsvorrichtung an beiden Bandkanten der Flachprodukte jeweils mehrere, auf die Bandkanten gerichtete Düsen, insbesondere drei Düsen, aufweist und dass die Düsen an den Seitenführungen der Walzstraße an den der Stauchvorrichtung zugewandten Enden der Seitenführungen angebracht und zusammen mit den Seitenführungen breitenverstellbar sind.According to the invention, the rolling train is characterized in that a first descaling device for descaling the strip edges of the flat products is arranged in front of the first stuffing device, that a first descaling device for descaling the strip edges of the flat products is arranged in front of the first stuffing device, that the first descaling device at both strip edges of the flat products each having a plurality of directed to the band edges nozzles, in particular three nozzles, and that the nozzles are attached to the side guides of the rolling train to the upsetting device facing the ends of the side guides and are width-adjustable together with the side guides.

Die Befestigung der Düsen an den Seitenführungen hat den Vorteil, dass der Abstand der Düsen zu der Bandkante immer konstant ist, vorausgesetzt, dass die Seitenführungen bzw. Lineale immer an die Bandkanten herausgefahren werden (was in der Praxis immer der Fall ist). Der konstante Abstand der Düsen zur Bandkante bewirkt in vorteilhafter Weise einen konstanten Kraftstoß des Wasserstrahls aus den Düsen auf die Bandkanten und damit eine gleichmäßige Entzunderungswirkung.The attachment of the nozzles to the side guides has the advantage that the distance of the nozzles to the band edge is always constant, provided that the side guides or rulers are always moved out to the band edges (which is always the case in practice). The constant distance between the nozzles and the strip edge advantageously produces a constant force impulse of the water jet from the nozzles onto the strip edges and thus a uniform descaling effect.

Vorzugsweise sind die Düsen an den Linealen der Seitenführungen angebracht und zusammen mit den Linealen breitenverstellbar.Preferably, the nozzles are attached to the rulers of the side guides and width adjustable together with the rulers.

Weiterhin lässt sich in einer Weiterbildung eine zweite Stauchvorrichtung vor der Fertigstraße vorsehen und vor dieser eine zweite Entzunderungsvorrichtung zur Entzunderung der Bandkanten der Flachprodukte.Furthermore, in a development, a second upsetting device can be provided in front of the finishing train, and in front of this a second descaling device for descaling the strip edges of the flat products.

Von Vorteil ist es ebenfalls, wenn die Düsen das Fluid jeweils unter einem Winkel von 60° bis 90°, bezogen auf die seitliche Oberfläche der Flachprodukte, insbesondere unter einem Winkel von 75°, auf die Bandkanten der Flachprodukte abstrahlen.It is also advantageous if the nozzles radiate the fluid respectively at an angle of 60 ° to 90 °, based on the lateral surface of the flat products, in particular at an angle of 75 °, on the band edges of the flat products.

Nachstehend wird die Erfindung in einem Ausführungsbeispiel näher erläutert.The invention will be explained in more detail in an embodiment.

Es zeigen:

Fig. 1
eine Schnittansicht des Vorbandes und seiner Führung in einer Walzstraße zur Herstellung von Flachprodukten aus Stahl mit einer Draufsicht auf eine Entzunderungsvorrichtung zum Entfernen von Zunder von den Seitenkanten der Flachprodukte und
Fig. 2
eine seitliche Ansicht der Walzstraße gemäß Fig. 1 im Bereich vor einem Stauchgerüst, teilweise geschnitten.
Show it:
Fig. 1
a sectional view of the pre-strip and its guide in a rolling mill for the production of flat steel products with a plan view of a descaling device for removing scale from the side edges of the flat products and
Fig. 2
a side view of the rolling mill according to Fig. 1 in the area in front of a compression frame, partially cut.

Eine Walzstraße, die beispielsweise einer Gießmaschine zum Erzeugen von Stranggussbrammen großer oder mittlerer Dicke nachgeordnet ist, umfasst eine Schere zum Teilen des Gießstranges in Brammen, einen Anwärm- oder Ausgleichsofen zum Anwärmen der kalt oder warm eingesetzten Stranggussbrammen oder zum Ausgleichen der Dünnstränge auf Walz-Starttemperatur und weist vor einer Stauchvorrichtung 1 (Fig. 2) zum seitlichen Stauchen der Flachprodukte eine Entzunderungsvorrichung 2 (Fig. 1, 2) zum Entzundern der seitlichen Bandkanten der Flachprodukte auf, wobei die Stauchvorrichtung 1 ihrerseits vor der Vorstraße angeordnet ist.A rolling train, for example, downstream of a casting machine for producing large or medium-sized continuous slabs, comprises a pair of scissors for dividing the cast strand into slabs, a heating or equalizing furnace for heating the cold or warm continuously cast slabs or for balancing the thin strands to rolling start temperature and before a compression device 1 (FIG. Fig. 2 ) for laterally compressing the flat products a Entzunderungsvorrichung 2 ( Fig. 1 . 2 ) for descaling the lateral strip edges of the flat products, wherein the compression device 1 in turn is arranged in front of the roughing train.

Die Flachprodukte oder Bänder werden über Rollen 3 gefördert. An ihren beiden Längskanten werden die Flachprodukte durch Lineale 4, 5 geführt, die je nach der Breite der Flachprodukte an verschiedenen Positionen verlaufen. Dies erfordert, dass die beiden Lineale 4, 5, symmetrisch zur Mitte in Richtung eines Doppelpfeils A quer zur Walzrichtung der Flachprodukte verschiebbar angeordnet sind.The flat products or ribbons are conveyed via rollers 3. At their two longitudinal edges of the flat products are guided by rulers 4, 5, depending on the width of the flat products at different positions. This requires that the two rulers 4, 5, are arranged symmetrically to the center in the direction of a double arrow A transversely to the rolling direction of the flat products slidably.

An den der Stauchvorrichtung 1 zugewandten vorderen Enden der Lineale 4, 5 sind jeweils drei Spritzdüsen 6a, 6b, 6c bzw. 7a, 7b und 7c zum Spritzen von Hochdruck-Wasserstrahlen auf die Bandkanten des Walzbandes angeordnet. Aus jeder der Düsen 6a, 6b, 6c, 7a, 7b und 7c wird das Wasser kegelförmig abgestrahlt, wobei sich die Wasserstrahlen überdecken, um die Seitenkanten der Flachprodukte voll zu beaufschlagen und den Zunder zu entfernen.At the upsetting device 1 facing the front ends of the rulers 4, 5 three spray nozzles 6a, 6b, 6c and 7a, 7b and 7c are arranged for spraying high-pressure water jets on the strip edges of the rolled strip. From each of the nozzles 6a, 6b, 6c, 7a, 7b and 7c, the water becomes conical blasted, covering the water jets to fully impact the side edges of the flat products and remove the scale.

Bezogen auf den Laufbereich des Walzbandes, ist weiter außerhalb der Positionen der Düsen 6a, 6b, 6c, 7a, 7b und 7c auf beiden Seiten als Spritzschutz jeweils eine Spritzwand 8, 9 vorhanden, die vorzugsweise ortsfest angebracht ist. Durch die Spritzwände 8, 9 hindurch verläuft jeweils eine flexible Medienkette 10 bzw. 11, die im Inneren jeweils einen Hochdruck-Schlauch 12, 13 zur Zuführung des Wassers aus einer gemeinsamen Zuführleitung 14 aufweist. Mit der Änderung der Position der Düsen 6a, 6b, 6c, 7a, 7b und 7c entsprechend der Breite des Walzbandes lassen sich auch die Medienketten 10, 11 und mit diesen die Schläuche 12, 13 verlagern.Relative to the running region of the rolled strip, further away from the positions of the nozzles 6a, 6b, 6c, 7a, 7b and 7c on both sides there is a splash wall 8, 9 which is preferably fixed in position. Through the splash walls 8, 9 passes through each flexible media chain 10 and 11, each having a high-pressure hose 12, 13 for supplying the water from a common supply line 14 inside. With the change in the position of the nozzles 6a, 6b, 6c, 7a, 7b and 7c corresponding to the width of the rolled strip, the media chains 10, 11 and with them the tubes 12, 13 can be displaced.

Die Düsen 6a, 6b, 6c bzw. 7a, 7b und 7c sind auf beiden Seiten jeweils an Spritzbalken 15, 16 integriert, die das mechanisch starre Endstück der Schläuche 12, 13 bilden. Die Spritzbalken 15, 16 sind auf den Linealen 4, 5 befestigt und mit diesen verfahrbar. Dadurch wird eine von der Breite des Walzbandes unabhängige, konstante Einwirkung der Wasserstrahlen auf die Seitenkanten des Walzbandes gewährleistet, um den Zunder von ihnen zu entfernen, so dass dieser nicht in der Stauchvorrichtung 1 mit eingewalzt wird, wodurch die Qualität des Walzbandes verbessert wird.The nozzles 6a, 6b, 6c and 7a, 7b and 7c are respectively integrated on both sides with spray bars 15, 16, which form the mechanically rigid end piece of the tubes 12, 13. The spray bars 15, 16 are mounted on the rulers 4, 5 and movable with them. As a result, a constant, independent of the width of the rolled strip ensures the effect of water jets on the side edges of the rolled strip to remove the scale from them, so that it is not rolled in the compression device 1, whereby the quality of the rolled strip is improved.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Stauchvorrichtungclincher
22
Entzunderungsvorrichtungdescaling
33
Rollenroll
44
Linealruler
55
Linealruler
6a6a
Düsejet
6b6b
Düsejet
6c6c
Düsejet
7a7a
Düsejet
7b7b
Düsejet
7c7c
Düsejet
88th
Spritzwandbulkhead
99
Spritzwandbulkhead
1010
Medienkettemedia chain
1111
Medienkettemedia chain
1212
Schlauchtube
1313
Schlauchtube
1414
Zuführleitungfeed
1515
Spritzbalkenspray bars
1616
Spritzbalkenspray bars
AA
Doppelpfeildouble arrow

Claims (8)

  1. Method for producing flat products of steel from continuously cast slabs of greater or medium thickness or from thin strips, which are upset and which subsequently run through a roughing train and a finishing train, and the flat products prior to upsetting are descaled at the strip edges thereof by a fluid standing under high pressure, in particular at least one high-pressure water jet, and wherein the fluid at the two strip edges is irradiated onto the strip edges by way of a respective plurality of nozzles directed onto each of the strip edges, characterised in that the nozzles are mounted on the straight edges (4, 5) of the lateral guides of the rolling train at the ends, which face the upsetting device, of the lateral guides and are adjusted in width together with the straight edges (4, 5).
  2. Method according to claim 1, characterised in that the flat products after running through the roughing train and before running through the finishing train are descaled a further time at the strip edges thereof.
  3. Method according to one of claims 1 and 2, characterised in that the at least one high-pressure water jet fluid is irradiated at an angle of 60° to 90° referred to the lateral surface of the flat products, particularly at an angle of 75°, onto the flat products.
  4. Rolling train for producing flat products of steel from continuously cast slabs of greater or medium thickness or from thin strips, comprising a first upsetting device (1), a roughing train and a finishing train, characterised in that a first descaling device (2) for descaling the strip edges of the flat products is arranged upstream of the first upsetting device (1), that the first descaling device (2) has at each of the two strip edges of the flat products a respective plurality of nozzles, in particular three nozzles (6a, 6b, 6c; 7a, 7b, 7c), directed onto the strip edges and that the nozzles (6a, 6b, 6c; 7a, 7b, 7c) are mounted on the lateral guides of the rolling train at the ends, which face the upsetting device (1), of the lateral guides and are adjustable in width together with the lateral guides.
  5. Rolling train according to claim 4, characterised in that the nozzles are mounted on the straight edges (4, 5) of the lateral guides and are adjustable in width together with the straight edges (4, 5).
  6. Rolling train according to claim 4 or 5, characterised in that a second upsetting device is provided upstream of the finishing train and that a second descaling device for descaling the strip edges of the flat products is arranged upstream of the second upsetting device.
  7. Rolling train according to claim 6, characterised in that the second descaling device has at each of the two strip edges at least one nozzle which is directed onto a respective one of the two strip edges of the flat products and from which a fluid, particularly water, can be irradiated under high pressure onto the strip edges.
  8. Rolling train according to any one of claims 4 to 7, characterised in that the fluid can be irradiated from the nozzles (6a, 6b, 6c; 7a, 7b, 7c) onto the flat products in each instance at an angle of 60° to 90° referred to the lateral surface of the flat products, particularly at an angle of 75°.
EP09799265.5A 2008-12-18 2009-12-17 Method and device for descaling a metal strip Not-in-force EP2379244B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008063547A DE102008063547A1 (en) 2008-12-18 2008-12-18 Method and device for descaling a metal strip
PCT/EP2009/009077 WO2010069574A2 (en) 2008-12-18 2009-12-17 Method and device for descaling a metal strip

Publications (2)

Publication Number Publication Date
EP2379244A2 EP2379244A2 (en) 2011-10-26
EP2379244B1 true EP2379244B1 (en) 2013-12-04

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Application Number Title Priority Date Filing Date
EP09799265.5A Not-in-force EP2379244B1 (en) 2008-12-18 2009-12-17 Method and device for descaling a metal strip

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US (1) US20110247382A1 (en)
EP (1) EP2379244B1 (en)
JP (1) JP2012512029A (en)
KR (1) KR20110071135A (en)
CN (1) CN102256719A (en)
DE (1) DE102008063547A1 (en)
RU (1) RU2481907C2 (en)
UA (1) UA103065C2 (en)
WO (1) WO2010069574A2 (en)

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Publication number Priority date Publication date Assignee Title
CN103042055B (en) * 2012-12-27 2015-06-10 攀钢集团西昌钢钒有限公司 Hot-rolled billet steel rough-rolling descaling method
DE102015204664A1 (en) * 2015-03-16 2016-09-22 Lechler Gmbh Flat jet nozzle and use of a flat jet nozzle
CN113042553B (en) * 2021-02-25 2023-02-17 首钢京唐钢铁联合有限责任公司 Hot rolling fine descaling device and hot rolling production line

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Publication number Publication date
KR20110071135A (en) 2011-06-28
EP2379244A2 (en) 2011-10-26
CN102256719A (en) 2011-11-23
WO2010069574A2 (en) 2010-06-24
UA103065C2 (en) 2013-09-10
JP2012512029A (en) 2012-05-31
RU2011129648A (en) 2013-01-27
DE102008063547A1 (en) 2010-07-01
WO2010069574A3 (en) 2010-08-12
US20110247382A1 (en) 2011-10-13
RU2481907C2 (en) 2013-05-20

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