EP0889762A1 - Method and arrangement for producing hot-rolled steel strip - Google Patents

Method and arrangement for producing hot-rolled steel strip

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Publication number
EP0889762A1
EP0889762A1 EP97920581A EP97920581A EP0889762A1 EP 0889762 A1 EP0889762 A1 EP 0889762A1 EP 97920581 A EP97920581 A EP 97920581A EP 97920581 A EP97920581 A EP 97920581A EP 0889762 A1 EP0889762 A1 EP 0889762A1
Authority
EP
European Patent Office
Prior art keywords
hot
steel strip
rolled steel
production
plant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97920581A
Other languages
German (de)
French (fr)
Other versions
EP0889762B1 (en
Inventor
Joachim SCHÖNBECK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
SMS Siemag AG
Original Assignee
Mannesmann AG
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Filing date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • 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
    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/02—Austenitic rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/14—Soft reduction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/06—Interstand tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • 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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite

Definitions

  • the invention relates to a method and a plant for the production of hot-rolled steel strip from a continuously cast semi-finished product in directly successive steps
  • Hot strip is produced, for example, in such a way that a cast semifinished product, the weight of which is determined by the subsequent coil weight of the finished product, is shaped to the desired geometric dimensions by one or more rolling processes. These processes usually run in succession and not simultaneously. However, the sequential process sequence requires long processing times, complex rolling devices and significant ones
  • the selection of suitable casting parameters is particularly important due to the strict restriction in hot strip production to finish rolling the products in the austenitic range ( ⁇ 880 ° C).
  • Casting speed plays a major role, because in continuous operation it determines the temperature control throughout the system.
  • the object of the present invention is to provide a method and a plant for the production of hot strip from continuously cast semifinished product, in which or in which the hot strip is rolled directly from the melt into a finished product in a continuously endless process, the finish rolling in austenitic temperature range takes place.
  • the process heat of the casting process is to be used in the production of the hot strip, so that the process and the plant work more economically than conventional discontinuous processes and plants.
  • a plant for carrying out the process for the production of hot-rolled steel strip from a continuously cast semifinished product in directly successive work steps is characterized in that the rolling mill consists of the number of roll stands corresponding to the deformation steps, the working roll diameter of all the roll stand being less than or equal to 600 mm. With such work roll diameters, the necessary deformation of the
  • the working roller diameter is ⁇ 450 mm at least in the last two roll stands. Since the proposed plant and Process concept is particularly well suited for the production of the thinnest hot strip, work rolls with a small diameter have an advantage due to more favorable deformation conditions in the roll gap.
  • a further feature of the invention provides that a compensating section is provided between the casting machine and the rolling mill to improve the temperature homogeneity in the slab.
  • a compensating section can consist of a known type of compensating furnace in which heat is optionally supplied to the slab.
  • the compensating section can consist of a covered roller table of known design or also of a covered roller table in connection with an induction furnace. This can be both upstream and downstream of the rolling gear.
  • heating and / or cooling units are provided between two or more roll stands for setting any temperature profiles of the strip during processing.
  • any temperature curve in the system can be set, with which the requirements of various processes for ferritic rolling can also be met.
  • the casting system is equipped with an automatic control of the strand cooling, which positions the sump tip at any time as close as possible to the end of the continuous casting machine. This maximizes the energy content of the slab entering the rolling mill.
  • Devices for positive and negative roll bending are preferably provided in the roll stands of the rolling mill. With such devices, the Waizprofil of the belt can be influenced during the machining process according to the circumstances and goals.
  • the gripping condition a ⁇ is violated in at least one roll stand. Because the proposed System and process concept enables a virtually endless casting and rolling process, the otherwise indispensable feed condition ⁇ ⁇ does not have to be met for rolling. Only the drawing condition ⁇ ⁇ 2 ⁇ , the fulfillment of which guarantees the maintenance of the rolling process, must be fulfilled for this process. The possibility of violating the drawing-in conditions results in considerable technical and economic advantages, since work rolls with a smaller diameter can be used, which reduces the rolling force and the rolling moment. This leads to smaller and lighter rolling stands as well as smaller main drives.
  • At least the main drive of a scaffold is controlled via a minimum tension control. This is used advantageously in applications such as the proposed method, in which large rolling moments and large rolling stock thicknesses occur. This eliminates the need to install a looper between the scaffolding.
  • a vertical diving stand is provided in front of the first rolling stand, with which the edges of the cast semifinished product can be compressed. With a vertical stitch in front of the first horizontal frame, both the edge geometry and the
  • the only drawing figure shows a system according to the invention for the production of hot-rolled steel strip with a finished strip thickness of 1.0 mm.
  • 1 with a known ladle turret is designated, with which the mold 3 of a thin slab casting system is fed via the distributor channel 2.
  • the guide frame of this thin slab casting system is designated 4, to which the curved part 5 of the Thin slab caster with a rebending unit 6 connects.
  • the compensating furnace is designated, in which the temperature of the continuously cast semifinished product is homogenized over the cross section.
  • 8 denotes the scale washer following the equalizing furnace for the semi-finished product, to which the hot rolling mill with seven four-high stands 9 to 11 and 14 to 17 is directly connected.
  • the rolling mill is followed by a run-out roller table with cooling 18, a cross-cut shear 19 and the two hot bath reels 20. Between the stands 11 and 14 there is a temperature control element 12 for optional heating or cooling (active and passive) of the strip and a further device for descaling 13.
  • the semi-finished product leaves the continuous casting mold 3 at a speed of 0.09 m / s and a thickness h 0 of 100 mm.
  • the temperature of the semi-finished product is 1240 ° C.
  • the semi-finished product passes through the equalization furnace 7 and the scale washer 8, the temperature behind the scale washer being 1188 ° C. This is the temperature at which the semi-finished product is introduced into the first four-high mill stand 9, in which the thickness of the semi-finished product is 58 mm is reduced, which simultaneously increases its speed to 0.16 m / s, the temperature of the semi-finished product falling to 1131 ° C.
  • the thickness of the rolling stock was reduced to 29 mm
  • Requirements of the rolling process can optionally be increased or decreased.
  • the strip Before entering the next roll stand 14, the strip is descaled in 13. It enters the scaffolding 14 with 1018 ⁇ C.
  • the rolled stock In the rolling stand 15, the rolled stock is pierced with a thickness of 4.8 mm, the piercing speed is 1.97 m / s at a temperature of 983 ° C.
  • the thickness of the rolling stock is reduced to 2.1 mm by a further reduction in the roll stand 15, and the speed increases to 4.51 m / s.
  • the rolling stock enters the scaffold 16 at a temperature of 949 ⁇ C, in which the thickness is reduced to 1.2 mm and the speed is increased to 7.88 m / s.
  • the rolling stock is pierced at a temperature of 902 ° C. and rolled out to a final density of 1.0 mm.
  • the exit speed is 9.46 m / s at Temperature of 880 ° C.
  • the condition for the austenitic rolling of the steel considered here, a St 37, is thus fulfilled.
  • the rolling stock is alternately wound onto one of the two hot strip reels 20 and, after the desired coil weight has been reached, cut off by the cross-cutting shears 19.
  • the inventive measures consist in producing the strip directly from the melt in a continuous, endless process, that is to say not allowing the intermediate product slab to be separated. Only the finished hot strip is cut according to the coil weight. As a result, the casting heat in the entire system is fully utilized for the subsequent forming operations. With appropriate coordination of the system, e.g. the size of the work rolls, intermediate heating of the slab or belt is not absolutely necessary.
  • the final rolling temperature can also be influenced via a temperature control system (heating and / or cooling) in the process line.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

PCT No. PCT/DE97/00683 Sec. 371 Date Sep. 28, 1998 Sec. 102(e) Date Sep. 28, 1998 PCT Filed Mar. 25, 1997 PCT Pub. No. WO97/36699 PCT Pub. Date Oct. 9, 1997Hot rolled steel strip is produced from continuously cast semi-finished steel in directly successive work steps, in which, after conversion of the molten steel into continuously cast semi-finished steel in a stationary process, the semi-finished steel is fed directly from the continuous casting to a continuous hot rolling mill, without prior separation, and an endless steel strip of any desired thinness is produced at the final rolling temperatures usual in process technology directly from the primary heat, using certain parameters.

Description

Verfahren und Anlage zur Herstellung von warmgewalztem StahlbandProcess and plant for the production of hot-rolled steel strip
Beschreibungdescription
Die Erfindung betrifft ein Verfahren und eine Anlage zur Produktion von warmgewalztem Stahlband aus einem stranggegossenen Halbzeug in direkt aufeinanderfolgenden ArbeitsschrittenThe invention relates to a method and a plant for the production of hot-rolled steel strip from a continuously cast semi-finished product in directly successive steps
Die Herstellung von Warmband erfolgt beispielsweise derart, daß ein gegossenes Halbzeug, dessen Gewicht durch das spätere Bundgewicht des Fertigproduktes bestimmt ist, durch einen oder mehrere Walzprozesse auf die gewünschten geometrischen Abmessungen umgeformt wird. Üblicherweise laufen diese Prozesse hintereinander und nicht simultan ab. Der sequentielle Verfahrensablauf bedingt aber lange Bearbeitungszeiten, aufwendige Walzeinrichtungen sowie signifikanteHot strip is produced, for example, in such a way that a cast semifinished product, the weight of which is determined by the subsequent coil weight of the finished product, is shaped to the desired geometric dimensions by one or more rolling processes. These processes usually run in succession and not simultaneously. However, the sequential process sequence requires long processing times, complex rolling devices and significant ones
Energieverluste während der Bearbeitung. Darüber hinaus entstehen durch diesen diskontinuierlichen Betrieb Ausbnngungs- und Qualitätsverluste.Energy loss during processing. In addition, this discontinuous operation leads to losses in quality and expansion.
Vollkontinuiertich arbeitende Gießwalzanlagen sind in der Literatur schon mehrfach erwähnt. Es wurde jedoch stets darauf verwiesen, daß derartige Konfigurationen praktisch nicht anwendbar sind, da die zur Einstellung der gewünschten Warmbandeigenschaften notwendigen Endwalztemperaturen mit derartigen Anlagen nicht dargestellt werden können. Das Band werde aufgrund der niedrigen Gießgeschwindigkeit so schnell erkalten, daß ein Betrieb ohne Zwischenheizen nicht möglich sei, ein Betrieb mit den benötigten aufwendigen Heizaggregaten nicht wirtschaftlich sei.Continuously operating casting and rolling systems have been mentioned several times in the literature. However, it has always been pointed out that such configurations are practically not applicable, since the final rolling temperatures necessary for setting the desired hot strip properties cannot be represented with such systems. The belt will cool down so quickly due to the low casting speed that operation without intermediate heating is not possible, operation with the required complex heating units is not economical.
Durch die scharfe Restriktion bei der Warmbandherstellung, die Produkte im austenitischen Bereich (≥ 880 °C) fertigzuwalzen, kommt der Auswahl geeigneter Gießparameter besondere Bedeutung zu. Dabei spielen die Gießdicke und die 97/36699 PC17DE97/00683The selection of suitable casting parameters is particularly important due to the strict restriction in hot strip production to finish rolling the products in the austenitic range (≥ 880 ° C). The casting thickness and the play 97/36699 PC17DE97 / 00683
Gießgeschwindigkeit eine große Rolle, weil beim kontinuierlichen Betrieb durch sie die Temperaturführung durch die gesamte Anlage bestimmt wird.Casting speed plays a major role, because in continuous operation it determines the temperature control throughout the system.
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren und eine Anlage zur Produktion von Warmband aus stranggegossenem Halbzeug zu schaffen, bei dem bzw. bei der das Warmband in einem kontinuierlich endlosen Prozeß direkt aus der Schmelze heraus zu einem Fertigprodukt gewalzt wird, wobei die Fertigwalzung im austenitischen Temperaturbereich stattfindet. Bei der Herstellung des Warmbandes soll dabei die Prozeßwärme des Gießprozesses verwendet werden, so daß das Verfahren und die Anlage wirtschaftlicher arbeiten als herkömmliche diskontinuieriiche Verfahren und Anlagen.The object of the present invention is to provide a method and a plant for the production of hot strip from continuously cast semifinished product, in which or in which the hot strip is rolled directly from the melt into a finished product in a continuously endless process, the finish rolling in austenitic temperature range takes place. The process heat of the casting process is to be used in the production of the hot strip, so that the process and the plant work more economically than conventional discontinuous processes and plants.
Zur Lösung der Aufgabe wird das im Patentanspruch 1 definierte Verfahren vorgeschlagen.To achieve the object, the method defined in claim 1 is proposed.
Durch die geeignete Wahl der Gießparameter -Gießdicke h0 und Gießgeschwindigkeit vc- wird die schärfste Restriktion bei der Warmbadherstellung überwindbar, nämlich das Produkt im austenitischen Bereich fertigzuwalzen. Es hat sich nämlich gezeigt, daß, wenn das Produkt aus Brammendicke [m] und Gießgeschwindigkeit [m/min] größer ist als 0,487 m2/min ein erfolgreicher Produktionsprozeß für das Warmband mit Fertigwalzung im austenitischen Bereich durchgeführt werden kann, wenn gleichzeitig die Zahl der Verformungsschritte n im Walzwerk der im Patentanspruch 1 angegebenen Formel folgt.Through the appropriate selection of the casting parameters - casting thickness h 0 and casting speed v c - the strictest restriction in hot bath production can be overcome, namely to finish-roll the product in the austenitic range. It has been shown that if the product of slab thickness [m] and casting speed [m / min] is greater than 0.487 m 2 / min, a successful production process for the hot strip with finish rolling in the austenitic range can be carried out, if the number at the same time the deformation steps n in the rolling mill follows the formula given in claim 1.
Eine Anlage zur Durchführung des Verfahrens zur Produktion von warmgewalztem Stahlband aus einem stranggegossenen Halbzeug in direkt aufeinanderfolgenden Arbeitsschritten ist dadurch gekennzeichnet, daß das Walzwerk aus der den Verformungsschritten entsprechenden Zahl von Walzgerüsten besteht, deren Arbeitswaizendurchmesser aller Walzgerüst kleiner oder gleich 600 mm ist. Mit derartigen Arbeitswalzendurchmessern läßt sich die notwendige Verformung desA plant for carrying out the process for the production of hot-rolled steel strip from a continuously cast semifinished product in directly successive work steps is characterized in that the rolling mill consists of the number of roll stands corresponding to the deformation steps, the working roll diameter of all the roll stand being less than or equal to 600 mm. With such work roll diameters, the necessary deformation of the
Walzgutes erreichen, die erforderlich ist, um die gewünschteTemperaturführung durch die Anlage zu erreichen.Rolling stock that is required to achieve the desired temperature control through the system.
Besonders günstig ist es, wenn der Arbeitswaizendurchmesser mindestens in den letzten beiden Walzgerüsten < 450 mm ist. Da das vorgeschlagene Anlagen- und Verfahrenskonzept besonders gut für die Produktion von dünnstem Warmband geeignet ist, besitzen Arbeitswalzen mit kleinem Durchmesser aufgrund günstigerer Verformungsbedingungen im Walzspalt einen Vorteil.It is particularly favorable if the working roller diameter is <450 mm at least in the last two roll stands. Since the proposed plant and Process concept is particularly well suited for the production of the thinnest hot strip, work rolls with a small diameter have an advantage due to more favorable deformation conditions in the roll gap.
Um eine gleichmäßige Temperatur über dem gesamten Halbzeugquerschnitt zu erreichen, ist nach einem weiteren Merkmal der Erfindung vorgesehen, daß zwischen der Gießmaschine und dem Walzwerk eine Ausgieichsstrecke zur Verbesserung der Temperaturhomogenität in der Bramme vorgesehen ist. Eine solche Ausgleichsstrecke kann aus einem Ausgieichsofen bekannter Bauart bestehen, in dem der Bramme gegebenenfalls Wärme zugeführt wird. Alternativ kann die Ausgleichsstrecke aus einem abgedeckten Rollgang bekannter Bauart oder auch aus einem abgedeckten Rollgang in Verbindung mit einem Induktionsofen bestehen. Dieser kann dem Roilgang sowohl vor- als auch nachgeschaltet sein.In order to achieve a uniform temperature over the entire cross-section of the semi-finished product, a further feature of the invention provides that a compensating section is provided between the casting machine and the rolling mill to improve the temperature homogeneity in the slab. Such a compensating section can consist of a known type of compensating furnace in which heat is optionally supplied to the slab. Alternatively, the compensating section can consist of a covered roller table of known design or also of a covered roller table in connection with an induction furnace. This can be both upstream and downstream of the rolling gear.
Zur weiteren Temperaturführung des Bandes durch das Walzwerk ist nach einem anderen Merkmal der Erfindung vorgesehen, daß zwischen zwei oder mehreren Waizgerüsten zur Einstellung beliebiger Temperaturveriäufe des Bandes während der Bearbeitung Heiz- und/oder Kühlaggregate vorgesehen sind. Durch entsprechende Steuerung dieser Aggregate läßt sich ein beliebiger Temperaturverlauf in der Anlage einstellen, mit der auch die Voraussetzungen diverser Verfahren zum ferritischen Walzen erfüllt werden können.According to another feature of the invention, for further temperature control of the strip through the rolling mill, heating and / or cooling units are provided between two or more roll stands for setting any temperature profiles of the strip during processing. By appropriately controlling these units, any temperature curve in the system can be set, with which the requirements of various processes for ferritic rolling can also be met.
Nach einem ausgestaltenden Merkmal der Erfindung ist vorgesehen, daß die Gießanlage mit einer automatischen Regelung der Strangkühlung ausgestattet ist, die die Sumpf spitze zu jedem Zeitpunkt möglichst nahe am Ende der Stranggießmaschine positioniert. Hierdurch wird der Energieinhalt der in das Walzwerk eintretenden Bramme maximiert.According to a design feature of the invention, it is provided that the casting system is equipped with an automatic control of the strand cooling, which positions the sump tip at any time as close as possible to the end of the continuous casting machine. This maximizes the energy content of the slab entering the rolling mill.
Vorzugsweise sind in den Walzgerüsten des Walzwerkes Einrichtungen zur positiven und negativen Walzenbiegung vorgesehen. Mit derartigen Einrichtungen kann das Waizprofil des Bandes während des Bearbeitungsprozesses entsprechend den Gegebenheiten und Zielen beeinflußt werden.Devices for positive and negative roll bending are preferably provided in the roll stands of the rolling mill. With such devices, the Waizprofil of the belt can be influenced during the machining process according to the circumstances and goals.
In einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß in mindestens einem Walzgerüst die Greifbedingung a <μ verletzt ist. Da das vorgeschlagene Anlagen- und Verfahrenskonzept einen quasi endlosen Gieß- und Walzprozeß ermöglicht, muß die ansonsten für das Walzen zwingend bestehende Einzugsbedingung α < μ nicht erfüllt werden. Lediglich die Durchzugsbedingung α < 2μ, deren Erfüllung die Aufrechterhaltung des Walzprozesses garantiert, muß für dieses Verfahren erfüllt sein. Aus der Möglichkeit, die Einzugsbedingung zu verletzen, ergeben sich erhebliche technische und wirtschaftliche Vorteile, da Arbeitswalzen mit kleinerem Durchmesser genutzt werden können, wodurch Walzkraft und Walzmoment sinken. Dies führt zu kleineren und leichteren Walzgerüsten sowie zu kleineren Hauptantrieben.In a further embodiment of the invention it is provided that the gripping condition a <μ is violated in at least one roll stand. Because the proposed System and process concept enables a virtually endless casting and rolling process, the otherwise indispensable feed condition α <μ does not have to be met for rolling. Only the drawing condition α <2μ, the fulfillment of which guarantees the maintenance of the rolling process, must be fulfilled for this process. The possibility of violating the drawing-in conditions results in considerable technical and economic advantages, since work rolls with a smaller diameter can be used, which reduces the rolling force and the rolling moment. This leads to smaller and lighter rolling stands as well as smaller main drives.
Des weiteren ist vorgesehen, daß zumindest der Hauptantrieb eines Gerüstes über eine Minimalzugregelung geregelt wird. Diese wird bei Anwendungen wie dem vorgeschlagenen Verfahren, bei dem große Walzmomente und große Walzgutdicken auftreten, vorteilhaft eingesetzt. Hierdurch kann auf die aufwendige Installation eines Loopers zwischen den Gerüsten verzichtet werden.Furthermore, it is provided that at least the main drive of a scaffold is controlled via a minimum tension control. This is used advantageously in applications such as the proposed method, in which large rolling moments and large rolling stock thicknesses occur. This eliminates the need to install a looper between the scaffolding.
Schließlich ist in einer Ergänzung der Erfindung vorgesehen, daß vor dem ersten Walzgerüst ein Vertikaistauchgerüst vorgesehen ist, mit dem die Kanten des gegossenen Halbzeuges gestaucht werden können. Durch einen Vertikalstich vor dem ersten Horizontalgerüst werden sowohl die Kantengeometrie als auch dieFinally, it is provided in a supplement to the invention that a vertical diving stand is provided in front of the first rolling stand, with which the edges of the cast semifinished product can be compressed. With a vertical stitch in front of the first horizontal frame, both the edge geometry and the
Kantenqualität verbessert. Darüber hinaus sind höhere Abnahmen in dem ersten Horizontalgerüst realisierbar. Ursache für diese Vorteile sind die Formgebung und die Rekristallisation der Kanten beim Stauchstich.Edge quality improved. In addition, higher decreases can be realized in the first horizontal frame. The reasons for these advantages are the shape and the recrystallization of the edges during the upsetting stitch.
Die Erfindung zusätzlich verbessernde und ausgestaltende Merkmale sind in weiteren Unteransprüchen niedergelegt.Features which additionally improve and design the invention are laid down in further subclaims.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben.An embodiment of the invention is shown in the drawing and is described below.
Die einzige Zeichnungsfigur zeigt eine erfindungsgemäße Anlage zur Herstellung von warmgewalztem Stahlband mit einer Fertigbanddicke von 1 ,0 mm. Mit 1 ist ein bekannter Pfannendrehturm bezeichnet, mit dem über die Verteilerrinne 2 die Kokille 3 einer Dünnbrammengießaniage gespeist wird. Das Führungsgerüst dieser Dünnbrammengießaniage ist mit 4 bezeichnet, an das sich der Bogenteil 5 der Dünnbrammengießanlage mit einer Rückbiegeeinheit 6 anschließt. Mit 7 ist der Ausgleichsofen bezeichnet, in dem die Temperatur des stranggegossenen Halbzeuges über den Querschnitt homogenisiert wird. 8 bezeichnet den dem Ausgleichsofen folgenden Zunderwäscher für das Halbzeug, an den sich unmittelbar das Warmwalzwerk mit sieben Quarto-Walzgerüsten 9 bis 11 und 14 bis 17 anschließt. Dem Walzwerk folgen ein Auslaufrollgang mit Kühlung 18, eine Querteilschere 19 und die beiden Warmbadhaspel 20. Zwischen den Gerüsten 11 und 14 ist ein Temperaturstellglied 12 zum optionalen Heizen oder Kühlen (aktiv und passiv) des Bandes sowie eine weitere Einrichtung zum Entzundern 13 vorgesehen.The only drawing figure shows a system according to the invention for the production of hot-rolled steel strip with a finished strip thickness of 1.0 mm. 1 with a known ladle turret is designated, with which the mold 3 of a thin slab casting system is fed via the distributor channel 2. The guide frame of this thin slab casting system is designated 4, to which the curved part 5 of the Thin slab caster with a rebending unit 6 connects. With 7 the compensating furnace is designated, in which the temperature of the continuously cast semifinished product is homogenized over the cross section. 8 denotes the scale washer following the equalizing furnace for the semi-finished product, to which the hot rolling mill with seven four-high stands 9 to 11 and 14 to 17 is directly connected. The rolling mill is followed by a run-out roller table with cooling 18, a cross-cut shear 19 and the two hot bath reels 20. Between the stands 11 and 14 there is a temperature control element 12 for optional heating or cooling (active and passive) of the strip and a further device for descaling 13.
Wie im oberen Bereich der Zeichnungsfigur zu erkennen, verläßt das Halbzeug die Stranggießkokille 3 mit einer Geschwindigkeit von 0,09 m/s und einer Dicke h0 von 100 mm. Am Ende der Bogenstrecke 4 der Stranggießanlage beträgt die Temperatur des Halbzeuges 1240 °C. Das Halbzeug durchläuft den Ausgleichsofen 7 und den Zunderwäscher 8, wobei die Temperatur hinter dem Zunderwäscher 1188 "C beträgt. Dies ist die Temperatur, mit dem das Halbzeug in das erste Quarto-Walzgerüst 9 eingeführt wird, in dem die Dicke des Halbzeuges auf 58 mm reduziert wird, wodurch sich gleichzeitig seine Geschwindigkeit auf 0,16 m/s erhöht. Dabei sinkt die Temperatur des Halbzeuges auf 1131 βC ab. Nach Verlassen des zweiten Walzgerüstes 10 wurde die Dicke des Walzgutes auf 29 mm reduziert, dieAs can be seen in the upper area of the drawing figure, the semi-finished product leaves the continuous casting mold 3 at a speed of 0.09 m / s and a thickness h 0 of 100 mm. At the end of the arc section 4 of the continuous caster, the temperature of the semi-finished product is 1240 ° C. The semi-finished product passes through the equalization furnace 7 and the scale washer 8, the temperature behind the scale washer being 1188 ° C. This is the temperature at which the semi-finished product is introduced into the first four-high mill stand 9, in which the thickness of the semi-finished product is 58 mm is reduced, which simultaneously increases its speed to 0.16 m / s, the temperature of the semi-finished product falling to 1131 ° C. After leaving the second roll stand 10, the thickness of the rolling stock was reduced to 29 mm
Geschwindigkeit ist auf 0,33 m/s angestiegen. Das Walzgut hat sich weiter abgekühlt, nämlich auf eine Temperatur von 1075 βC. Nach Verlassen des Walzgerüstes 11 beträgt die Walzgutdicke nunmehr 12 mm und die Auslaufgeschwindigkeit des Bandes 0,79 m/s. Nachdem das Band das Walzgerüst 11 verlassen hat, tritt es in eine Temperaturregelstrecke 12 ein, in der die Temperatur des Bandes gemäß denSpeed has risen to 0.33 m / s. The rolling stock has cooled further, namely to a temperature of 1075 β C. After leaving the rolling stand 11, the rolling stock thickness is now 12 mm and the run-out speed of the strip is 0.79 m / s. After the strip has left the roll stand 11, it enters a temperature control section 12, in which the temperature of the strip according to the
Erfordernissen des Walzprozesses wahlweise erhöht oder gesenkt werden kann. Vor Eintritt in das nächste Walzgerüst 14 wird das Band in 13 entzundert. Es tritt mit 1018 βC in das Watzgerüst 14 ein. im Walzgerüst 15 wird das Walzgut mit 4,8 mm Dicke angestochen, die Anstichgeschwindigkeit beträgt 1,97 m/s bei einer Temperatur von 983 °C. Durch weitere Reduktion im Walzgerüst 15 wird die Dicke des Walzgutes auf 2,1 mm reduziert, die Geschwindigkeit erhöht sich auf 4,51 m/s. Das Walzgut tritt mit einer Temperatur von 949 βC in das Watzgerüst 16, in dem die Dicke auf 1 ,2 mm reduziert und die Geschwindigkeit auf 7,88 m/s erhöht wird. Im letzten Gerüst 17 wird das Walzgut mit einer Temperatur von 902 "C angestochen und auf eine Enddichte von 1 ,0 mm ausgewalzt. Die Austrittsgeschwindigkeit ergibt sich zu 9,46 m/s bei einer Temperatur von 880 °C. Damit ist die Bedingung für das austenitische Walzen des hier betrachteten Stahls, eines St 37, erfüllt. Nach Abkühlung auf dem Rollgang 18 wird das Walzgut wechselweise auf einen der beiden Warmbandhaspel 20 aufgewickelt und nach Erreichen des gewünschten Bundgewichtes durch die Querteilschere 19 abgetrennt.Requirements of the rolling process can optionally be increased or decreased. Before entering the next roll stand 14, the strip is descaled in 13. It enters the scaffolding 14 with 1018 β C. In the rolling stand 15, the rolled stock is pierced with a thickness of 4.8 mm, the piercing speed is 1.97 m / s at a temperature of 983 ° C. The thickness of the rolling stock is reduced to 2.1 mm by a further reduction in the roll stand 15, and the speed increases to 4.51 m / s. The rolling stock enters the scaffold 16 at a temperature of 949 β C, in which the thickness is reduced to 1.2 mm and the speed is increased to 7.88 m / s. In the last stand 17, the rolling stock is pierced at a temperature of 902 ° C. and rolled out to a final density of 1.0 mm. The exit speed is 9.46 m / s at Temperature of 880 ° C. The condition for the austenitic rolling of the steel considered here, a St 37, is thus fulfilled. After cooling on the roller table 18, the rolling stock is alternately wound onto one of the two hot strip reels 20 and, after the desired coil weight has been reached, cut off by the cross-cutting shears 19.
Die erfinderischen Maßnahmen bestehen darin, das Band in einem kontinuierlichen endlosen Prozeß direkt aus der Schmelze zu erzeugen, also eine Trennung des Vorproduktes Bramme nicht stattfinden zu lassen. Erst das fertige Warmband wird entsprechend dem Bundgewicht zerschnitten. Dadurch wird in der Gesamtanlage die Gießhitze in vollem Umfang für die nachfolgenden Umformoperationen ausgenutzt. Bei entsprechender Abstimmung der Anlage, z.B. der Größe der Arbeitswalzen, ist eine Zwischenheizung der Bramme bzw. des Bandes nicht unbedingt erforderlich. Die Endwalztemperatur kann aber zusätzlich über eine Temperaturregelstrecke (Heizen und/oder Kühlen) in der Prozeßlinie beeinflußt werden. The inventive measures consist in producing the strip directly from the melt in a continuous, endless process, that is to say not allowing the intermediate product slab to be separated. Only the finished hot strip is cut according to the coil weight. As a result, the casting heat in the entire system is fully utilized for the subsequent forming operations. With appropriate coordination of the system, e.g. the size of the work rolls, intermediate heating of the slab or belt is not absolutely necessary. The final rolling temperature can also be influenced via a temperature control system (heating and / or cooling) in the process line.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung von warmgewalztem Stahlband aus einem stranggegossenen Halbzeug in direkt aufeinanderfolgenden Arbeitsschritten, bei dem nach Umwandlung des flüssigen Stahls in das stranggegossene1. Process for the production of hot-rolled steel strip from a continuously cast semi-finished product in directly successive steps, in which after the conversion of the molten steel into the continuously cast
Halbzeug in einem stationären Prozeß das Halbzeug ohne vorherige Trennung aus der Stranggießmaschine heraus direkt in ein kontinuierliches Warmwalzwerk eingeführt wird und unter Anwendung der folgenden Parameter ein endloses, beliebig dünnes Stahlband mit den verfahrenstechnisch üblichen Endwalztemperaturen direkt aus der Primärhitze heraus produziert wird:Semi-finished product in a stationary process The semi-finished product is introduced directly into a continuous hot rolling mill without prior separation from the continuous casting machine and an endless, arbitrarily thin steel strip is produced directly from the primary heat using the following parameters:
-die Brammendicke h0 [m] und die Gießgeschwindigkeit vc [m/min] erfüllen die-The slab thickness h 0 [m] and the casting speed v c [m / min] meet that
Relation h0 • vc > 0,487 m2 / min -die Verformung im Walzwerk erfolgt in mindestens n Verformungsschritten, wobei gilt n = 0,51 + 3,29 lgιo(h0)Relation h 0 • v c > 0.487 m 2 / min - the deformation in the rolling mill takes place in at least n deformation steps, where n = 0.51 + 3.29 lgιo (h 0 )
2. Anlage zur Durchführung des Verfahrens zur Produktion von warmgewalztem Stahlband aus einem stranggegossenen Halbzeug in direkt aufeinanderfolgenden Arbeitsschritten nach Anspruch 1 , dadurch gekennzeichnet, daß das Walzwerk aus der Anzahl der Verformungsschritte n entsprechenden Zahl von Walzgerüsten (8 bis 15) besteht, deren Arbeitswaizendurchmesser aller Walzgerüste (8 bis 15) < 600 mm ist.2. Plant for carrying out the process for the production of hot-rolled steel strip from a continuously cast semifinished product in directly successive steps according to claim 1, characterized in that the rolling mill consists of the number of deformation steps n corresponding number of roll stands (8 to 15), the working roll diameter of all Roll stands (8 to 15) <600 mm.
3. Anlage zur Produktion von warmgewalztem Stahlband nach Anspruch 2, dadurch gekennzeichnet, daß der Arbeitswaizendurchmesser mindestens in den letzten beiden Walzgerüsten (14 und 15) kleiner als 450 mm ist. 3. Plant for the production of hot-rolled steel strip according to claim 2, characterized in that the working roller diameter is at least in the last two rolling stands (14 and 15) less than 450 mm.
4. Anlage zur Produktion von warmgewalztem Stahlband nach Anspruch 2 und 3, dadurch gekennzeichnet, daß zwischen der Stranggießmaschine (3 bis 6) und dem Walzwerk (9 bis 17) eine Ausgleichsstrecke (7) zur Verbesserung der Temperaturhomogenität der4. Plant for the production of hot-rolled steel strip according to claim 2 and 3, characterized in that between the continuous casting machine (3 to 6) and the rolling mill (9 to 17) a compensating section (7) to improve the temperature homogeneity of the
Bramme vorgesehen ist.Slab is provided.
5. Anlage zur Produktion von warmgewalztem Stahlband nach Anspruch 2 bis 4, dadurch gekennzeichnet, daß zwischen zwei oder mehreren Gerüsten (9 bis 1 1 und 14 bis 17) zur Einstellung beliebiger Temperaturverläufe des Bandes während der Bearbeitung Heiz-und/oder Kühlaggregate vorgesehen sind.5. Plant for the production of hot-rolled steel strip according to claim 2 to 4, characterized in that between two or more stands (9 to 1 1 and 14 to 17) for setting any temperature profiles of the strip during processing heating and / or cooling units are provided .
6. Anlage zur Produktion von warmgewalztem Stahlband nach6. Plant for the production of hot-rolled steel strip after
Anspruch 2 bis 5, dadurch gekennzeichnet, daß die Stranggießanlage (3 bis 6) mit einer automatischen Regelung derClaims 2 to 5, characterized in that the continuous casting plant (3 to 6) with an automatic control of the
Strangkühlung ausgestattet ist, die unabhängig von der Gießgeschwindigkeit die Sumpfspitze des Gießstranges möglichst nahe am Ende derStrand cooling is equipped, the irrespective of the casting speed the bottom of the casting strand as close to the end of the
Stranggießmaschine (6) positioniert.Continuous casting machine (6) positioned.
7. Anlage zur Produktion von warmgewalztem Stahlband nach Anspruch 2 bis 6, dadurch gekennzeichnet, daß in den Walzgerüsten (9 bis 11 und 14 bis 17) Einrichtungen zur positiven und negativen Walzenbiegung vorgesehen sind.7. Plant for the production of hot-rolled steel strip according to claim 2 to 6, characterized in that in the roll stands (9 to 11 and 14 to 17) facilities for positive and negative roll bending are provided.
8. Anlage zur Produktion von warmgewalztem Stahlband nach Anspruch 2 bis 7, dadurch gekennzeichnet, daß in mindestens einem der Walzgerüste (9 bis 1 1 und 14 bis 17) die8. Plant for the production of hot-rolled steel strip according to claim 2 to 7, characterized in that in at least one of the rolling stands (9 to 1 1 and 14 to 17)
Greifbedingung α < μ verletzt ist. Gripping condition α <μ is violated.
9. Anlage zur Produktion von warmgewalztem Stahlband nach Anspruch 2 bis 8, dadurch gekennzeichnet, daß zumindest der Hauptantrieb eines Walzgerüstes (9 bis 11 und 14 bis 17) über eine Minimalzugregelung geregelt ist.9. Plant for the production of hot-rolled steel strip according to claim 2 to 8, characterized in that at least the main drive of a roll stand (9 to 11 and 14 to 17) is regulated via a minimum tension control.
10. Anlage zur Produktion von warmgewalztem Stahlband nach Anspruch 1 bis 9, dadurch gekennzeichnet, daß vor dem ersten Walzgerüst (9) ein Vertikalstauchgerüst vorgesehen ist.10. Plant for the production of hot-rolled steel strip according to claim 1 to 9, characterized in that a vertical compression stand is provided in front of the first roll stand (9).
11. Anlage zur Produktion von warmgewalztem Stahlband nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß vor dem ersten Walzgerüst (9) folgenden weiteren Gerüsten Einrichtungen zur Bandentzunderung (13) vorgesehen sind.11. Plant for the production of hot-rolled steel strip according to one or more of the preceding claims, characterized in that devices for strip descaling (13) are provided in front of the first roll stand (9) following further stands.
12. Anlage zur Produktion von warmgewalztem Stahlband nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß hinter der Stranggußmaschine eine Notschere vorgesehen ist.12. Plant for the production of hot-rolled steel strip according to one or more of the preceding claims, characterized in that emergency scissors are provided behind the continuous casting machine.
13. Anlage zur Produktion von warmgewalztem Stahlband nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der im Kern noch flüssige Strang während der Einstarrung in seiner Dicke reduziert wird.13. Plant for the production of hot-rolled steel strip according to one or more of the preceding claims, characterized in that the strand which is still liquid in the core is reduced in thickness during the solidification.
14. Anlage zur Produktion von warmgewalztem Stahlband nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß ein oder mehrere Walzgerüste (9 bis 17) mit Watzenschleifeinrichtung zur Kompensation des Walzenverschleisses während der langen Gießzeiten ausgestattet sind. 14. Plant for the production of hot-rolled steel strip according to one or more of the preceding claims, characterized in that one or more roll stands (9 to 17) are equipped with a wiper grinding device to compensate for the roll wear during the long casting times.
15. Anlage zur Produktion von warmgewalztem Stahlband nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß ein oder mehrere Walzgerüste (9 bis 17) zum Walzenwechsel während des Betriebes mit Walzenwechseleinrichtungen ausgestattet sind. 15. Plant for the production of hot-rolled steel strip according to one or more of the preceding claims, characterized in that one or more roll stands (9 to 17) for changing rolls during operation are equipped with roll changing devices.
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RU2163934C2 (en) 2001-03-10
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US6092586A (en) 2000-07-25
WO1997036699A1 (en) 1997-10-09
ATE185987T1 (en) 1999-11-15
JP2000507503A (en) 2000-06-20
KR20000004992A (en) 2000-01-25

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