EP0889762B1 - Method for producing hot-rolled steel strip - Google Patents

Method for producing hot-rolled steel strip Download PDF

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Publication number
EP0889762B1
EP0889762B1 EP97920581A EP97920581A EP0889762B1 EP 0889762 B1 EP0889762 B1 EP 0889762B1 EP 97920581 A EP97920581 A EP 97920581A EP 97920581 A EP97920581 A EP 97920581A EP 0889762 B1 EP0889762 B1 EP 0889762B1
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EP
European Patent Office
Prior art keywords
steel strip
rolled steel
roller
strip according
manufacturing hot
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EP97920581A
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German (de)
French (fr)
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EP0889762A1 (en
Inventor
Joachim SCHÖNBECK
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Vodafone GmbH
SMS Siemag AG
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Mannesmann AG
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    • 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 for producing hot-rolled steel strip from a continuously cast semi-finished product in direct successive work steps.
  • the production of hot strip takes place, for example, in such a way that a cast one Semi-finished product, the weight of which is due to the subsequent coil weight of the finished product is determined by one or more rolling processes to the desired geometrical dimensions is formed. These processes usually run one after the other and not simultaneously. However, the sequential course of the process is conditional long processing times, complex rolling devices and significant Energy loss during processing. Beyond that arise through this discontinuous output and loss of quality.
  • a plant and a method for the continuous production of steel strip or Steel sheet from continuously cast flat products is from WO-A-89/11363 known.
  • a continuous cast is used Thin slab after reduction in a first pass of induction heating subjected and immediately afterwards in a multi-stand finishing train rolled into a strip that is wound up at the end of the road.
  • the well-known Solution is not always concerned with details of temperature control with the aim ensure that the finish rolling of the strip is in austenitic Temperature range takes place.
  • the object of the present invention is to provide a method for Manufacture of hot strip from continuous cast semi-finished product, in which or in which the hot strip in a continuously endless process directly from the Melt is rolled out to a finished product, the finish rolling in austenitic temperature range takes place.
  • the process heat of the casting process should be used so that the Processes and the plant work more economically than conventional discontinuous ones Processes and facilities.
  • the rolling mill In a plant to carry out the process the rolling mill consists of one corresponding to the number of deformation steps n Number of roll stands (8 to 15), their work roll diameter of all rolling stands (8 to 15) ⁇ 600 mm.
  • a compensation section to improve the Temperature homogeneity is provided in the slab.
  • Such Compensating section can consist of a compensating furnace of a known type, in which the slab may be supplied with heat.
  • the Compensating distance from a covered roller table of known design or from a covered roller table in connection with an induction furnace. This can be both upstream and downstream of the roller table.
  • the Casting plant is equipped with an automatic control of the strand cooling, which the top of the sump at all times as close as possible to the end of the Continuous casting machine positioned. As a result, the energy content of the Rolling slab entering maximized.
  • devices for positive are in the rolling stands of the rolling mill and negative roll bending are provided.
  • Such facilities that can Roll profile of the strip during the machining process according to the Circumstances and goals are influenced.
  • At least the main drive of a scaffold a minimum train regulation is regulated. This is used in applications like that proposed method in which large rolling moments and large rolling stock thicknesses occur, used advantageously. This allows for the complex installation of a Loopers between the scaffolding can be dispensed with.
  • the only drawing figure shows a plant for the production of hot-rolled steel strip with a finished strip thickness of 1.0 mm.
  • 1 is one Known ladle turret, with which the mold via the distribution channel 2 3 is fed to a thin slab caster.
  • the guiding structure of this Thin slab caster is denoted by 4, to which the arc part 5 of the Thin slab caster with a rebending unit 6 connects.
  • 6 is Equalization furnace referred to in which the temperature of the continuously cast Semi-finished product is homogenized over the cross section.
  • 8 denotes the Equalization furnace following scale washer for the semi-finished product to which immediately the hot rolling mill with seven four-high stands 9 to 11 and 14 to 17 connects.
  • the rolling mill is followed by an outlet roller table with cooling 18, one Cross cutting shear 19 and the two hot bath reels 20.
  • a temperature control element 12 for optional heating or cooling (active and passive) of the tape and another device for descaling 13 are provided.
  • the semifinished 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 semifinished 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 reduced to 58 mm, which at the same time increases its speed to 0.16 m / s.
  • the temperature of the semi-finished product drops to 1131 ° C.
  • the thickness of the rolling stock was reduced to 29 mm and the speed rose to 0.33 m / s.
  • the rolling stock has cooled further, namely to a temperature of 1075 ° C.
  • the thickness of the rolling stock is now 12 mm and the exit speed of the strip is 0.79 m / s.
  • the strip After the strip has left the roll stand 11, it enters a temperature control section 12, in which the temperature of the strip can optionally be increased or decreased in accordance with the requirements of the rolling process.
  • the strip is descaled in 13. It enters the roll stand 14 at 1018 ° C.
  • the rolled material 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 rolling stand 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 a 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 of keeping the tape in a continuous to produce an endless process directly from the melt, i.e. a separation of the Not to let the intermediate product slab take place. Only the finished hot strip is cut according to the bundle weight. As a result, the Casting heat fully exploited 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 controlled via a temperature control system (heating and / or cooling) can be influenced in the process line.

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  • 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)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Coating With Molten Metal (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

Die Erfindung betrifft ein Verfahren zur Herstellung von warmgewalztem Stahlband aus einem stranggegossenen Halbzeug in direkt aufeinanderfolgenden Arbeitsschritten.The invention relates to a method for producing hot-rolled steel strip from a continuously cast semi-finished product in direct successive work 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 signifikante Energieverluste während der Bearbeitung. Darüber hinaus entstehen durch diesen diskontinuierlichen Betrieb Ausbringungs- und Qualitätsverluste.The production of hot strip takes place, for example, in such a way that a cast one Semi-finished product, the weight of which is due to the subsequent coil weight of the finished product is determined by one or more rolling processes to the desired geometrical dimensions is formed. These processes usually run one after the other and not simultaneously. However, the sequential course of the process is conditional long processing times, complex rolling devices and significant Energy loss during processing. Beyond that arise through this discontinuous output and loss of quality.

Vollkontinuierlich 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 Warmbandeigenschaffen 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.Fully continuous casting and rolling systems are already multiple in the literature mentioned. However, it has always been pointed out that such configurations are practically not applicable, since those for setting the desired Hot strip production creates the necessary final rolling temperatures with such systems cannot be displayed. The tape will go due to the low Cool down the casting speed so quickly that operation without intermediate heating is not possible operation with the required complex heating units is not possible be economical.

Eine Anlage und ein Verfahren zur kontinuierlichen Herstellung von Bandstahl oder Stahlblech aus stranggegossenen Flachprodukten ist aus der WO-A-89/11363 bekannt. Bei dieser Anlage bzw. bei diesem Verfahren wird eine stranggegossene Dünnbramme nach Reduktion in einem ersten Walzstich einer Induktionserwärmung unterzogen und unmittelbar im Anschluß daran in einer mehrgerüstigen Fertigstraße zu einem Band gewalzt, das am Ende der Straße aufgewickelt wird. Die bekannte Lösung befasst sich nicht mit Einzelheiten der Temperaturführung mit dem Ziel, stets sicherzustellen, daß die Fertigwalzung des Bandes im austenitischen Temperaturbereich stattfindet.A plant and a method for the continuous production of steel strip or Steel sheet from continuously cast flat products is from WO-A-89/11363 known. In this system or in this method, a continuous cast is used Thin slab after reduction in a first pass of induction heating subjected and immediately afterwards in a multi-stand finishing train rolled into a strip that is wound up at the end of the road. The well-known Solution is not always concerned with details of temperature control with the aim ensure that the finish rolling of the strip is in austenitic Temperature range takes place.

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 Gießgeschwindigkeit eine große Rolle, weil beim kontinuierlichen Betrieb durch sie die Temperaturführung durch die gesamte Anlage bestimmt wird.Due to the strict restriction in hot strip production, the products in the austenitic range (≥ 880 ° C), the choice is more suitable Casting parameters of particular importance. The casting thickness and the play Pouring speed plays a major role, because in continuous operation through it Temperature control through the entire system is determined.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zur Herstellung 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 Prozeßwarme des Gießprozesses verwendet werden, so daß das Verfahren und die Anlage wirtschaftlicher arbeiten als herkömmliche diskontinuierliche Verfahren und Anlagen.The object of the present invention is to provide a method for Manufacture of hot strip from continuous cast semi-finished product, in which or in which the hot strip in a continuously endless process directly from the Melt is rolled out to a finished product, the finish rolling in austenitic temperature range takes place. During the production of the hot strip the process heat of the casting process should be used so that the Processes and the plant work more economically than conventional discontinuous ones Processes and facilities.

Gelöst wird diese Aufgabe gemäß Anspruch 1 bei einem Verfahren zur Herstellung von warmgewalztem Stahlband aus einem stranggegossenen Halbzeug in direkt aufeinanderfolgenden Arbeitsschritten, bei dem nach Umwandlung des flüssigen Stahls in das stranggegossene 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 dünnes Stahlband mit den verfahrenstechnisch üblichen Endwalztemperaturen direkt aus der Primärhitze heraus produziert wird:

  • die Brammendicke h0 [m] und die Gießgeschwindigkeit vc [m/min] erfüllen die Relation h0*vc > 0,487 m2 / min
  • die Verformung im Walzwerk erfolgt in mindestens n Verformungsschritten, wobei gilt (Brammendicke ho in [cm]) n = 0,51 + 3,29 lg10(h0).
This object is achieved according to claim 1 in a process for the production of hot-rolled steel strip from a continuously cast semi-finished product in directly successive steps, in which after converting the liquid steel into the continuously cast semi-finished product in a stationary process, the semi-finished product without prior separation from the continuous casting machine directly into a continuous hot rolling mill is introduced and, using the following parameters, an endless thin steel strip is produced directly from the primary heat with the process-related final rolling temperatures:
  • the slab thickness h 0 [m] and the casting speed v c [m / min] fulfill the relation H 0 * v c > 0.487 m 2nd / min
  • the deformation in the rolling mill takes place in at least n deformation steps, whereby (slab thickness h o in [cm]) applies n = 0.51 + 3.29 lg 10th (H 0 ).

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 (n = 0,51 + 3,29 lg10(h0) folgt.Through the appropriate choice 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 of the formula given in claim 1 ( n = 0.51 + 3.29 lg 10th (H 0 ) follows.

Bei einer Anlage zur Durchführung des Verfahrens besteht das Walzwerk aus einer der Anzahl der Verformungsschritte n entsprechenden Zahl von Walzgerüsten (8 bis 15), deren Arbeitswalzendurchmesser aller Walzgerüste (8 bis 15) ≤ 600 mm ist. In a plant to carry out the process the rolling mill consists of one corresponding to the number of deformation steps n Number of roll stands (8 to 15), their work roll diameter of all rolling stands (8 to 15) ≤ 600 mm.

Mit derartigen Arbeitswalzendurchmessern läßt sich die notwendige Verformung des Walzgutes erreichen, die erforderlich ist, um die gewünschte Temperaturführung durch die Anlage zu erreichen.With such work roll diameters, the necessary deformation of the Rolling stock that is required to achieve the desired temperature control to reach the facility.

Besonders günstig ist es, wenn der Arbeitswalzendurchmesser 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 when the work roll diameter at least in the last two stands <450 mm. Since the proposed plant and Process concept particularly good for the production of the thinnest hot strip is suitable, have work rolls with a small diameter due to cheaper Deformation conditions in the roll gap an advantage.

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 Ausgleichsstrecke zur Verbesserung der Temperaturhomogenität in der Bramme vorgesehen ist. Eine solche Ausgleichsstrecke kann aus einem Ausgleichsofen 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 Rollgang sowohl vor- als auch nachgeschaltet sein.In order to maintain a uniform temperature across the entire cross-section of the semi-finished product achieve, it is provided according to a further feature of the invention that between the casting machine and the rolling mill a compensation section to improve the Temperature homogeneity is provided in the slab. Such Compensating section can consist of a compensating furnace of a known type, in which the slab may be supplied with heat. Alternatively, the Compensating distance from a covered roller table of known design or from a covered roller table in connection with an induction furnace. This can be both upstream and downstream of the roller table.

Zur weiteren Temperaturführung des Bandes durch das Walzwerk ist nach einem anderen Merkmal der Erfindung vorgesehen, daß zwischen zwei oder mehreren Walzgerüsten zur Einstellung beliebiger Temperaturverläufe 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.For further temperature control of the strip through the rolling mill is after a another feature of the invention provided that between two or more Roll stands for setting any temperature curve of the strip during the Processing heating and / or cooling units are provided. By appropriate Control of these units can be any temperature curve in the system with which the requirements of various processes for ferritic Rolls can be met.

Nach einem ausgestaltenden Merkmal der Erfindung ist vorgesehen, daß die Gießanlage mit einer automatischen Regelung der Strangkühlung ausgestattet ist, die die Sumpfspitze 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 plant is equipped with an automatic control of the strand cooling, which the top of the sump at all times as close as possible to the end of the Continuous casting machine positioned. As a result, the energy content of the Rolling slab entering maximized.

Vorzugsweise sind in den Walzgerüsten des Walzwerkes Einrichtungen zur positiven und negativen Walzenbiegung vorgesehen. Mit derartigen Einrichtungen kann das Walzprofil des Bandes während des Bearbeitungsprozesses entsprechend den Gegebenheiten und Zielen beeinflußt werden.Preferably, devices for positive are in the rolling stands of the rolling mill and negative roll bending are provided. With such facilities that can Roll profile of the strip during the machining process according to the Circumstances and goals are influenced.

In einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß in mindestens einem Walzgerüst die Greifbedingung α < µ (Walzenwinkel < Reibungsbeiwert) 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 in at least a rolling stand the gripping condition α <µ (roll angle <coefficient of friction) is hurt. Since the proposed system and process concept is a quasi endless casting and rolling process allows, otherwise for rolling mandatory entry criteria α <µ are not met. Only that Passing condition α <2µ, the fulfillment of which maintains the Guaranteed rolling process must be fulfilled for this process. From the possibility violating the collection conditions result in considerable technical and Economic advantages, since work rolls with a smaller diameter are used can, which reduces the rolling force and 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 a minimum train regulation is regulated. This is used in applications like that proposed method in which large rolling moments and large rolling stock thicknesses occur, used advantageously. This allows for the complex installation of a Loopers between the scaffolding can be dispensed with.

Schließlich ist in einer Ergänzung der Erfindung vorgesehen, daß vor dem ersten Walzgerüst ein Vertikalstauchgerüst 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 die 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.Finally, it is provided in a supplement to the invention that before the first Roll stand a vertical compression stand is provided with which the edges of the cast semifinished product can be compressed. Through a vertical stitch in front Both the edge geometry and the Edge quality improved. In addition, there are higher decreases in the first Horizontal scaffold possible. The reason for these advantages are the shape and the Recrystallization of the edges in the upset stitch.

Die Erfindung zusätzlich verbessernde und ausgestaltende Merkmale sind in weiteren Unteransprüchen niedergelegt. Features which improve and design the invention are further Subclaims laid down.

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

Die einzige Zeichnungsfigur zeigt eine 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 Dünnbrammengießanlage gespeist wird. Das Führungsgerüst dieser Dünnbrammengießanlage 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 Entzundem 13 vorgesehen.The only drawing figure shows a plant for the production of hot-rolled steel strip with a finished strip thickness of 1.0 mm. With 1 is one Known ladle turret, with which the mold via the distribution channel 2 3 is fed to a thin slab caster. The guiding structure of this Thin slab caster is denoted by 4, to which the arc part 5 of the Thin slab caster with a rebending unit 6 connects. At 7 he is Equalization furnace referred to in which the temperature of the continuously cast Semi-finished product is homogenized over the cross section. 8 denotes the Equalization furnace following scale washer for the semi-finished product to which immediately the hot rolling mill with seven four-high stands 9 to 11 and 14 to 17 connects. The rolling mill is followed by an outlet roller table with cooling 18, one Cross cutting shear 19 and the two hot bath reels 20. Between the stands 11 and 14 is a temperature control element 12 for optional heating or cooling (active and passive) of the tape and another device for descaling 13 are provided.

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 °C ab. Nach Verlassen des zweiten Walzgerüstes 10 wurde die Dicke des Walzgutes auf 29 mm reduziert, die Geschwindigkeit ist auf 0,33 m/s angestiegen. Das Walzgut hat sich weiter abgekühlt, nämlich auf eine Temperatur von 1075 °C. 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 den 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 °C in das Walzgerüst 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 °C in das Walzgerüst 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.As can be seen in the upper area of the drawing figure, the semifinished 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 arc section 4 of the continuous caster, the temperature of the semi-finished product is 1240 ° C. The semifinished 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 reduced to 58 mm, which at the same time increases its speed to 0.16 m / s. The temperature of the semi-finished product drops to 1131 ° C. After leaving the second roll stand 10, the thickness of the rolling stock was reduced to 29 mm and the speed rose to 0.33 m / s. The rolling stock has cooled further, namely to a temperature of 1075 ° C. After leaving the rolling stand 11, the thickness of the rolling stock is now 12 mm and the exit 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 can optionally be increased or decreased in accordance with the requirements of the rolling process. Before entering the next roll stand 14, the strip is descaled in 13. It enters the roll stand 14 at 1018 ° C. In the rolling stand 15, the rolled material 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 rolling stand 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. 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 a 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 of keeping the tape in a continuous to produce an endless process directly from the melt, i.e. a separation of the Not to let the intermediate product slab take place. Only the finished hot strip is cut according to the bundle weight. As a result, the Casting heat fully exploited 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 controlled via a temperature control system (heating and / or cooling) can be influenced in the process line.

Claims (15)

  1. Method of manufacturing hot-rolled steel strip from a continuously cast semi-finished product in directly consecutive operation stages, in which after conversion of the liquid steel into the continuously cast semi-finished product in a stationary process, the semi-finished product is fed without prior separation from the continuous casting machine direct into a continuous hot-rolling mill and with the application of the following parameters a continuous, thin steel strip with the final rolling temperatures which are conventional for the process is produced direct from the primary heat:
    the slab thickness ho [m] and the casting rate vc [m/min] satisfy the equation ho.vc > 0.487 m2/min
    deformation in the rolling mill is effected in at least n deformation stages, where (slab thickness ho in [cm]) n = 0.51 + 3.29 lg10 (ho).
  2. Method according to claim 1, characterised in that the rolling mill consists of a number of roller stands (8 to 15) which correspond to the number of deformation stages n and whose operating roller diameter of all roller stands (8 to 15) ≤ 600 mm.
  3. Method of manufacturing hot-rolled steel strip according to claim 2, characterised in that the working roller diameter, at least in the last two roller stands (14 and 15) is smaller than 450 mm.
  4. Method of manufacturing hot-rolled steel strip according to claim 2 and 3, characterised in that between the continuous cast machine (3 to 6) and the rolling mill (9 to 17) an equalising section (7) is provided to improve the evenness of temperature in the slab.
  5. Method of manufacturing hot-rolled steel strip according to claim 2 to 4, characterised in that between two or more stands (9 to 11 and 14 to 17) heating and/or cooling units are provided to set any temperature curve in the strip during processing.
  6. Method of manufacturing hot-rolled steel strip according to claim 2 to 5, characterised in that the continuous casting plant (3 to 6) is equipped with an automatic control for strand cooling which positions the sump tip of the casting strand as close as possible to the end of the continuous casting machine (6) independently of the casting rate.
  7. Method of manufacturing hot-rolled steel strip according to claim 2 to 6, characterised in that in the rolling stands (9 to 11 and 14 to 17) have devices for positive and negative turning of the rollers.
  8. Method of manufacturing hot-rolled steel strip according to claim 2 to 7, characterised in that in at least one of the roller stands (9 to 11 and 14 to 17) the grip condition α < µ (roller angle < coefficient of friction) is infringed.
  9. Method of manufacturing hot-rolled steel strip according to claim 2 to 8, characterised in that at least the main drive of a roller stand (9 to 11 and 14 to 17) is controlled via a minimal traction control.
  10. Method of manufacturing hot-rolled steel strip according to claim 1 to 9, characterised in that in front of the first roller stand (9) a vertical upsetting stand is provided.
  11. Method of manufacturing hot-rolled steel strip according to one or more of the preceding claims, characterised in that in front of the first roller stand (9) of the subsequent further stands devices for scale removal (13) are provided.
  12. Method of manufacturing hot-rolled steel strip according to one or more of the preceding claims, characterised in that behind the continuous casting machine a pair of emergency shears is provided.
  13. Method of manufacturing hot-rolled steel strip according to one or more of the preceding claims, characterised in that the strand, which is still molten inside, is reduced in thickness while solidifying.
  14. Method of manufacturing hot-rolled steel strip according to one or more of the preceding claims, characterised in that one or more roller stands (9 to 17) are equipped with a roller grinding device in order to compensate for roller wear during the long casting times.
  15. Method of manufacturing hot-rolled steel strip according to one or more of the preceding claims, characterised in that one or more roller frames (9 to 17) are equipped with roller-changing devices for changing a roller during operation.
EP97920581A 1996-03-28 1997-03-25 Method for producing hot-rolled steel strip Expired - Lifetime EP0889762B1 (en)

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DE19613718 1996-03-28
DE19613718A DE19613718C1 (en) 1996-03-28 1996-03-28 Process and plant for the production of hot-rolled steel strip
PCT/DE1997/000683 WO1997036699A1 (en) 1996-03-28 1997-03-25 Method and arrangement for producing hot-rolled steel strip

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CN1214642A (en) 1999-04-21
CN1103647C (en) 2003-03-26

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