EP0841994A1 - Method and device for operating a continuous casting plant - Google Patents

Method and device for operating a continuous casting plant

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Publication number
EP0841994A1
EP0841994A1 EP96925644A EP96925644A EP0841994A1 EP 0841994 A1 EP0841994 A1 EP 0841994A1 EP 96925644 A EP96925644 A EP 96925644A EP 96925644 A EP96925644 A EP 96925644A EP 0841994 A1 EP0841994 A1 EP 0841994A1
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EP
European Patent Office
Prior art keywords
slab
continuous casting
strand
casting machine
casting
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
EP96925644A
Other languages
German (de)
French (fr)
Other versions
EP0841994B1 (en
Inventor
Fritz-Peter Pleschiutschnigg
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.)
SMS Siemag AG
Original Assignee
Mannesmann AG
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Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0841994A1 publication Critical patent/EP0841994A1/en
Application granted granted Critical
Publication of EP0841994B1 publication Critical patent/EP0841994B1/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/34—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by hydraulic expansion of the rolls
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets

Definitions

  • the invention relates to a method for operating a continuous caster with a belt casting machine having a stationary mold, which is connected via a roller table to a compensating furnace, and a device for casting strips.
  • EP 0 264 459 B1 discloses a process for producing hot-rolled steel strip from continuously cast slabs, in which the solidified cast strand is separated into sections of the same length and these sections are successively introduced into an oven in which they are stored over a period of time finally to be handed over to a roller table of a rolling mill.
  • the liquefied material for forming the cast strand is cooled in the sheet guide of the continuous casting machine.
  • the exit temperature of the cast strand at the end of the sheet guide is still above 1150 ° C.
  • the cast strand cools down and runs from the roller table at a temperature of approximately 1150 ° C. onto a runway located in the storage furnace.
  • the system required to carry out this process is bound to a defined strand thickness with a corresponding casting speed. Changes in the casting parameters regularly result in production losses, quality reductions and increases in effort.
  • a lowering of the casting speed with constant solidification thickness i.e. if casting rolling is not possible, leads to severe temperature loss due to the additional cooling of the slab in the continuous caster as well as the long dwell time of the strand on its way to the leveling furnace.
  • the cross-cutting system known from this document since no scissors are used here, leads to large radiation losses due to the long process time.
  • the invention has set itself the goal of creating a method with a corresponding device in which the casting parameters of a given production chain, consisting of a continuous casting plant, a compensating furnace and a rolling mill, can be changed with simple means and the casting performance is at least maintained.
  • the invention is based on the knowledge that in the combination of the continuous casting stage with the rolling stage, both in billet, slab and, in particular, thin slab casting, the energy content of the strand in the temperature compensation furnace immediately downstream of the continuous casting installation is of great importance in the roller hearth or transverse transport furnace .
  • the energy content of the slab can be used as a guide variable for operating the entire system when it enters the compensating furnace.
  • the energy content of the slab is adjusted to the desired rolling temperature of the hot strip to be produced when it enters the compensating furnace.
  • the furnace can be operated in such a way that no energy is to be supplied to the strand, but that it is only used to compensate for the slab temperature.
  • Basic design e.g. a solidification thickness of 60 mm at a casting speed of 5 m / min. the solidification thickness of the slab is reduced and the casting speed is influenced, irrespective of the influencing variable such as strand cooling or insulation between the continuous casting machine and the furnace.
  • Another possibility to increase the casting performance combined with a higher heat content of the slab when entering one of the continuous casting plants directly downstream furnace is made possible by casting rolling in the casting machine, ie reducing the casting thickness during solidification.
  • the casting parameters are set in such a way that the slab when the
  • Compensating furnace corresponds to the desired rolling temperature of the hot strip to be produced.
  • the system now makes it possible to increase the casting performance with constant casting thickness and maximum casting speed and to control the heat content of the slab entering the compensating furnace.
  • the parameters are set so that the bottom of the sump is always in the area of the mouth
  • Belt casting machine is located. Depending on the current energy content of the strand immediately behind the continuous casting machine, heat can be drawn from the slab by active cooling, or heat radiation is largely prevented by an insulating device.
  • the casting speed is dependent on the decreasing thickness with the same width of the slab to its maximum value of 7.2 m / min.
  • Casting speed increased the casting capacity is increased from 2.31 to 2.77 t / min., I.e. from 100 to 120%.
  • the casting performance can not only be maintained by this measure, but even increased.
  • the energy content and thus the corresponding average slab temperature rises at the furnace inlet C of 1111 C to 1150 ° C. This temperature increase can lead to the fact that the slab in the area of the roller table in front of the compensating furnace has to be adjusted to the desired slab temperature at the furnace inlet by cooling.
  • Figure 1 A diagram of the continuous caster.
  • Figure 2 A diagram of the slab average temperature as a function of the casting speed.
  • Continuous casting machine 10 The continuous casting machine 10 is followed by a roller table 21, which produces the shortest possible connection, for example a length of 10 m, to the compensating furnace 50.
  • a transverse transport furnace 51 is provided in the upper part of the picture and a roller hearth furnace 52 is provided in the lower part of the picture.
  • insulating hoods 32 and cooling elements 31 are provided in the area of the roller table 21 in the upper part of the picture and cooling elements 31 for influencing the heat content of the slab.
  • the continuous casting machine 10 has a metallurgical length of 9.3 m, the roller table 21 has a length of 10 m, the slabs are separated by a cross cutting device 22 to a length of about 43 m, so that the cross transport furnace 51 has a length of around 45 m and the roller hearth 52 has a length of 150 m.
  • a conventional rolling mill 60 for producing hot strips of 1 mm thickness is connected to the equalizing furnace 51 or 52.
  • the equalizing furnace 51 or 52 For example, consist of a one- or two-stand preliminary stage with a subsequent winding station and finishing train.
  • the standard situation is in a) with a basic design of a solidification thickness of 60 mm at the entrance of the compensating furnace, which is provided 10 m away from the end of the continuous caster, and a casting speed of 5 m / min. designed. Approx. 0.3 to 0.5 l water / kg steel spray water is cooled in the continuous casting machine until the slab at the end of the machine
  • the casting speed is increased more than would be the case with an increase with a constant thickness of the slab, brought to its maximum value and taking into account the setting of the sump tip at the end of the machine, a temperature increase occurs, in the present case 1150 ° C. Entry into the equalization furnace expected (point h)). If this temperature is too high for the desired rolling process, heat can be extracted from the strand by cooling.
  • the point i) shows the expected capacity temperature increases with a slab thickness of 55 mm and a possible casting speed of 6 m / min.
  • the straight lines D show the conditions for the respective slab thicknesses, the index indicating the thickness D in mm.
  • the Roman numerals show the possibility of influencing the individual slab thicknesses with regard to influencing the temperature of the slab, namely:
  • the circled values show the relative casting performance. For example, in point k) an increase in output in relation to the casting output in point a) by a factor of 1, 2 is possible.

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Abstract

The invention concerns a method of operating a continuous casting plant (10) having a continuous casting machine which comprises a stationary mould (11) and is connected to a soaking pit furnace (50) via a roller table (21). When the slab format has been determined at the mould outlet, of the casting parameters at least the casting speed is set such that the slab, on entering the soaking pit (50), has the desired rolling temperature for the hot strip to be produced, and the tip (F) of the liquid phase is always in the mouth region of the continuous casting machine. Measures are taken in order to influence the thermal energy content of the slab when it has left the continuous casting machine. The invention further concerns the continuous casting machine used for this purpose.

Description

Verfahren und Einrichtung zum Betreiben einer StranggießanlageMethod and device for operating a continuous caster
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zum Betreiben einer Stranggießanlage mit einer eine stationäre Kokille aufweisende Bandgießmaschine, die über ein Rollgang mit einem Ausgleichsofen verbunden ist und einer Einrichtung zum Gießen von Bändern.The invention relates to a method for operating a continuous caster with a belt casting machine having a stationary mold, which is connected via a roller table to a compensating furnace, and a device for casting strips.
Aus EP 0 264 459 B1 ist ein Verfahren zur Herstellung von warmgewalzten Stahlband aus stranggegossenen Brammen bekannt, bei dem der erstarrte Gußstrang in Teilstücke gleicher Länge abgetrennt wird und diese Teilstücke nacheinander in einen Ofen eingeführt werden, in welchen sie über einen Zeitraum gespeichert werden, um abschließend einem Ablaufrollgang einer Walzfertigstraße übergeben zu werden. Das verflüssigte Material zur Bildung des Gußstranges wird in der Bogenführung der Stranggießmaschine abgekühlt. Die Austrittstemperatur des Gußstranges am Ende der Bogenführung liegt noch oberhalb von 1150°C. Auf dem Weg von der Mündung der Stranggießmaschine zum Eintritt des Speicherofens kühlt sich der Gußstrang ab und läuft vom Rollgang mit einer Temperatur von etwa 1150°C auf eine im Speicherofen befindliche Rollbahn ein.EP 0 264 459 B1 discloses a process for producing hot-rolled steel strip from continuously cast slabs, in which the solidified cast strand is separated into sections of the same length and these sections are successively introduced into an oven in which they are stored over a period of time finally to be handed over to a roller table of a rolling mill. The liquefied material for forming the cast strand is cooled in the sheet guide of the continuous casting machine. The exit temperature of the cast strand at the end of the sheet guide is still above 1150 ° C. On the way from the mouth of the continuous casting machine to the entrance to the storage furnace, the cast strand cools down and runs from the roller table at a temperature of approximately 1150 ° C. onto a runway located in the storage furnace.
Die zur Durchführung dieses Verfahrens erforderliche Anlage ist an eine festgelegte Strangdicke mit entsprechender Gießgeschwindigkeit gebunden. Änderungen der Gießparameter haben regelmäßig Produktionseinbußen, Qualitätsminderungen und Aufwandserhöhungen zur Folge.The system required to carry out this process is bound to a defined strand thickness with a corresponding casting speed. Changes in the casting parameters regularly result in production losses, quality reductions and increases in effort.
So führt eine Senkung der Gießgeschwindigkeit bei konstanter Erstarrungsdicke, wenn also kein Gießwalzen möglich ist, zu starken Temperatur- Leistungsverlusten durch die zusätzliche Kühlung der Bramme in der Stranggießanlage sowie die große Verweilzeit des Stranges auf seinem Weg zum Ausgleichofen. Außerdem führt die aus dieser Schrift bekannte Querteilanlage, da hier keine Schere eingesetzt wird, zu großen Strahlungsverlusten bedingt durch die lange Verfahrenszeit.A lowering of the casting speed with constant solidification thickness, i.e. if casting rolling is not possible, leads to severe temperature loss due to the additional cooling of the slab in the continuous caster as well as the long dwell time of the strand on its way to the leveling furnace. In addition, the cross-cutting system known from this document, since no scissors are used here, leads to large radiation losses due to the long process time.
Die Erfindung hat sich das Ziel gesetzt, ein Verfahren mit entsprechender Einrichtung zu schaffen, bei der mit einfachen Mitteln die Gießparameter einer vorgegebenen Produktionskette, bestehend aus Stranggießanlage, Ausgleichsofen und Walzwerk, veränderbar sind und dabei die Gießleistung mindestens erhalten bleibt.The invention has set itself the goal of creating a method with a corresponding device in which the casting parameters of a given production chain, consisting of a continuous casting plant, a compensating furnace and a rolling mill, can be changed with simple means and the casting performance is at least maintained.
Der Erfindung liegt die Erkenntnis zugrunde, daß beim Verbund der Stranggießstufe mit der Walzstufe sowohl beim Knüppel-, Brammen- als auch insbesondere beim Dünnbrammengießen der Energieinhalt des Stranges in den unmittelbar hinter der Stranggießanlage sich anschließenden Temperaturausgleichsofen die Rollenherd- bzw. Quertransportofen von großer Bedeutung ist. In überraschender Weise zeigt sich, daß der Energieinhalt der Bramme beim Eintritt in den Ausgleichsofen als Leitgröße für das Betreiben der Gesamtanlage genutzt werden kann. Dabei wird der Energieinhalt der Bramme beim Eintritt in den Ausgleichsofen der gewünschten Walztemperatur des zu erzeugenden Warmbandes eingestellt. Der Ofen läßt sich dabei so betreiben, daß dem Strang keine Energie zuzuführen ist, sondern daß er nur noch zum Ausgleich der Brammentemperatur dient.The invention is based on the knowledge that in the combination of the continuous casting stage with the rolling stage, both in billet, slab and, in particular, thin slab casting, the energy content of the strand in the temperature compensation furnace immediately downstream of the continuous casting installation is of great importance in the roller hearth or transverse transport furnace . Surprisingly, it can be seen that the energy content of the slab can be used as a guide variable for operating the entire system when it enters the compensating furnace. The energy content of the slab is adjusted to the desired rolling temperature of the hot strip to be produced when it enters the compensating furnace. The furnace can be operated in such a way that no energy is to be supplied to the strand, but that it is only used to compensate for the slab temperature.
Mit der Auswahl der Brammentemperatur beim Eintritt in den Ausgleichsofen als Fixpunkt ist der Stahlwerker frei, die Parameter in den vorgeschalteten Anlagenteilen zu variieren. Hierbei werden unerwartete Lösungen aufgefunden, wenn bei einerBy selecting the slab temperature when entering the equalization furnace as a fixed point, the steelworker is free to vary the parameters in the upstream parts of the plant. Here, unexpected solutions are found if one of the
Basisauslegung z.B. eine Erstarrungsdicke von 60 mm bei einer Gießgeschwindigkeit von 5 m/min. die Erstarrungsdicke der Bramme verringert und Einfluß auf die Gießgeschwindigkeit genommen wird, abgesehen von Einflußgröße wie Strangkühlung oder Isolation zwischen Stranggießmaschine und Ofen.Basic design e.g. a solidification thickness of 60 mm at a casting speed of 5 m / min. the solidification thickness of the slab is reduced and the casting speed is influenced, irrespective of the influencing variable such as strand cooling or insulation between the continuous casting machine and the furnace.
Eine weitere Steigungsmöglichkeit der Gießleistung verbunden mit einem höheren Wärmeinhalt der Bramme beim Einlauf in einen der Stranggießanlage direkt nachgeschalteten Ofen wird möglich durch ein Gießwalzen in der Gießmaschine, d.h. der Reduktion der Gießdicke während der Erstarrung.Another possibility to increase the casting performance combined with a higher heat content of the slab when entering one of the continuous casting plants directly downstream furnace is made possible by casting rolling in the casting machine, ie reducing the casting thickness during solidification.
Erfindungsgemäß werden nach Festlegung des Brammenformates vom Kokillenaustritt die Gießparameter in der Weise eingestellt, daß die Bramme bei Eintritt desAccording to the invention, after determining the slab format from the mold outlet, the casting parameters are set in such a way that the slab when the
Ausgleichsofens der gewünschten Walztemperatur des zu erzeugenden Warmbandes entspricht. Das System erlaubt es nunmehr, die Gießleistung bei konstanter Gießdicke und maximaler Gießgeschwindigkeit zu steigern sowie den Wärmeinhalt der in den Ausgleichofen einlaufenden Bramme zu steuern. Die Parameter werden dabei so eingestellt, daß die Sumpfspitze sich stets im Mündungsbereich derCompensating furnace corresponds to the desired rolling temperature of the hot strip to be produced. The system now makes it possible to increase the casting performance with constant casting thickness and maximum casting speed and to control the heat content of the slab entering the compensating furnace. The parameters are set so that the bottom of the sump is always in the area of the mouth
Bandgießmaschine befindet. In Abhängigkeit des aktuellen Energieinhaltes des Stranges unmittelbar hinter der Stranggießmaschine wird der Bramme durch aktive Kühlung vorgebbar Wärme entzogen oder durch eine Isoliereinrichtung die Wärmeabstrahlung weitgehendst verhindert.Belt casting machine is located. Depending on the current energy content of the strand immediately behind the continuous casting machine, heat can be drawn from the slab by active cooling, or heat radiation is largely prevented by an insulating device.
Bei der Basisauslegung einer Stranggießanlage mit einer Erstarrungsdicke der Bramme von 60 mm und einer maximalen möglichen Geschwindigkeit von 5 m/min. ist beispielsweise eine metallurgische Länge von 9,3 m vorgesehen. Wird die Erstarrungdicke von 60 auf 50 mm durch Gießwalzen oder durch Umrüstung der Stranggießmaschine verringert, so wird unter Beibehaltung der Gießgeschwindigkeit und unter Berücksichtigung, daß die Strahlungsverluste in Abhängigkeit von der abnehmenden Bramme zunehmen und gleichzeitig die Erstarrungszeit eines Stranges mit kleiner werdender Dicke mit dem Quadrat der halben Dicke abnimmt, die Produktionsleistung verringert.With the basic design of a continuous caster with a solidification thickness of the slab of 60 mm and a maximum possible speed of 5 m / min. For example, a metallurgical length of 9.3 m is provided. If the solidification thickness is reduced from 60 to 50 mm by casting rolls or by retrofitting the continuous casting machine, then while maintaining the casting speed and taking into account that the radiation losses increase depending on the decreasing slab and at the same time the solidification time of a strand with decreasing thickness with the square half the thickness decreases, production output decreases.
Wird hingegen entgegen der üblichen Vorgehensweise, die Gießgeschwindigkeit in Abhängigkeit der abnehmenden Dicke bei gleicher Breite der Bramme auf ihren maximalen Wert von 7,2 m/min. Gießgeschwindigkeit erhöht, so wird die Gießleistung von 2,31 auf 2,77 t/min., also von 100 auf 120 % angehoben. Die Gießleistung läßt sich durch diese Maßnahme nicht nur halten, sondern sogar erhöhen. Bei dieser Verfahrensweise steigt gleichzeitig der Energieinhalt und damit die entsprechende durchschnittliche Brammentemperatur am Ofeneintritt von 1111 CC auf 1150°C. Diese Temperaturerhöhung kann dazu führen, daß die Bramme im Bereich des Rollganges vor dem Ausgleichofen durch Kühlung auf die gewünschte Brammentemperatur am Ofeneintritt einzustellen ist.Contrary to the usual procedure, the casting speed is dependent on the decreasing thickness with the same width of the slab to its maximum value of 7.2 m / min. Casting speed increased, the casting capacity is increased from 2.31 to 2.77 t / min., I.e. from 100 to 120%. The casting performance can not only be maintained by this measure, but even increased. In this procedure, at the same time the energy content and thus the corresponding average slab temperature rises at the furnace inlet C of 1111 C to 1150 ° C. This temperature increase can lead to the fact that the slab in the area of the roller table in front of the compensating furnace has to be adjusted to the desired slab temperature at the furnace inlet by cooling.
Durch die Verfahrenstechnik ist eine energieneutrale Ofenfahrweise unterDue to the process engineering, an energy-neutral furnace operation is under
Sicherstellung des gewünschten Energieinhaltes der Bramme am Ofeneintritt und der entsprechenden Walztemperatur am Ofenaustritt möglich. Ein solches System läßt auch eine unterschiedliche Walztemperatur von Bramme zu Bramme zu, da der Ofen im wesentlichen nur noch als Ausgleichofen und somit neutral arbeitet und keine Aufheizug mehr vorzunehmen hat.It is possible to ensure the desired energy content of the slab at the furnace inlet and the corresponding rolling temperature at the furnace outlet. Such a system also allows a different rolling temperature from slab to slab, since the furnace essentially only works as a compensating furnace and thus neutral and no longer has to be heated up.
Neben diesen Energievorteilen sind noch weitere Vorteile zu nennen wie:In addition to these energy advantages, there are other advantages such as:
Verbesserte Gußstruktur durch den Gießwalzvorgang während der Erstarrung - Ein erhöhter Schlackenschmierfilm in der Kokille, der zu einem: verringertem Wärmestau in die Kokille führt und damit zu einer geringeren thermischen Belastung: der Strangschale - Verringerung von Spannungen und von Vermeidung von Rissen - und der Kokillenplatte - Erhöhung der Kokillenhaltbarkeit - .Improved casting structure through the casting-rolling process during solidification - an increased slag lubrication film in the mold, which leads to: reduced heat build-up in the mold and thus to a lower thermal load: the strand shell - reduction of stresses and avoidance of cracks - and the mold plate - Increasing mold durability -.
Ein Beispiel der Erfindung ist in der beiliegenden Zeichnung dargelegt. Dabei zeigt dieAn example of the invention is set out in the accompanying drawing. The shows
Figur 1 Ein Schema der Stranggießanlage.Figure 1 A diagram of the continuous caster.
Figur 2 Ein Diagramm der Brammendurchschnittstemperatur in Abhängigkeit von der Gießgeschwindigkeit.Figure 2 A diagram of the slab average temperature as a function of the casting speed.
Die Figur 1 zeigt eine Stranggießmaschine 10 mit einer stationären Kokille 11. Im Strang S erstreckt sich die Sumpfspitze F bis zur Mündung 13 der1 shows a continuous casting machine 10 with a stationary mold 11. In the strand S, the sump tip F extends to the mouth 13 of the
Stranggießmaschine 10. An die Stranggießmaschine 10 schließt sich ein Rollgang 21 an, der eine möglichst kurze Verbindung, beispielsweise eine Länge von 10 m aufweist, zum Ausgleichsofen 50 herstellt. Im oberen Teil des Bildes ist ein Quertransportofen 51 vorgesehen und im unteren Teil des Bildes ein Rollenherdofen 52 vorgesehen.Continuous casting machine 10. The continuous casting machine 10 is followed by a roller table 21, which produces the shortest possible connection, for example a length of 10 m, to the compensating furnace 50. A transverse transport furnace 51 is provided in the upper part of the picture and a roller hearth furnace 52 is provided in the lower part of the picture.
Weiterhin sind im Bereich des Rollganges 21 im oberen Teil des Bildes Isolierhauben 32 und im unteren Teil des Bildes Kühlelemente 31 zur Einflußnahme des Wärmeinhaltes der Bramme vorgesehen.Furthermore, insulating hoods 32 and cooling elements 31 are provided in the area of the roller table 21 in the upper part of the picture and cooling elements 31 for influencing the heat content of the slab.
Die Stranggießmaschine 10 besitzt eine metallurgische Länge von 9,3 m, der Rollgang 21 weist eine Länge von 10 m auf, die Brammen werden durch eine Quertrenneinrichtung 22 auf eine Länge von etwa 43 m getrennt, so daß der Quertransportofen 51 eine Länge von rund 45 m und der Rollenherdofen 52 eine Länge von 150 m aufweist.The continuous casting machine 10 has a metallurgical length of 9.3 m, the roller table 21 has a length of 10 m, the slabs are separated by a cross cutting device 22 to a length of about 43 m, so that the cross transport furnace 51 has a length of around 45 m and the roller hearth 52 has a length of 150 m.
An den Ausgleichsofen 51 oder 52 schließt sich ein übliches Walzwerk 60 zur Herstellung von Warmbändern von 1 mm Dicke an. Es kann z.B. aus einem ein-, oder zweigerüstigen Vorstufe mit sich anschließender Wickelstation und Fertigstraße bestehen.A conventional rolling mill 60 for producing hot strips of 1 mm thickness is connected to the equalizing furnace 51 or 52. For example, consist of a one- or two-stand preliminary stage with a subsequent winding station and finishing train.
In der Figur 2 ist in a) die Standardsituation bei einer Basisauslegung von einer Erstarrungsdicke von 60 mm beim Eintritt des Ausgleichsofens, der 10 m entfernt vom Ende der Stranggießanlage vorgesehen ist, und einer Gießgeschwindigkeit von 5 m/min. ausgelegt. In der Stranggießmaschine wird ca. 0,3 bis 0,5 I Wasser/Kg Stahl Spritzwasser soweit gekühlt, so die Bramme am Ende der Maschine eineIn FIG. 2, the standard situation is in a) with a basic design of a solidification thickness of 60 mm at the entrance of the compensating furnace, which is provided 10 m away from the end of the continuous caster, and a casting speed of 5 m / min. designed. Approx. 0.3 to 0.5 l water / kg steel spray water is cooled in the continuous casting machine until the slab at the end of the machine
Durchschnittsgeschwindigkeit von 1325 ° C auf weist. Bei der Geschwindigkeit von 5 m/min. weist diese Bramme beim Einlauf in den Ausgleichsofen eine Temperatur von 1111 °C auf. Wird die Brammendicke auf 50 mm verringert, so ergeben sich folgende Situationen: Bei der üblichen Erhöhung der Gießgeschwindigkeit von 5 auf 6 m/min. und konstanter Gießleistung sinkt die Oberflächentemperatur der Bramme und sie tritt mit nur 1067 °C in den Ausgleichofen ein (Punkt g)). Um eine Erhöhung der Brammentemperatur zu ermöglichen, kann erfindungsgemäß der Strang imAverage speed of 1325 ° C has. At the speed of 5 m / min. this slab has a temperature of 1111 ° C when entering the equalization furnace. If the slab thickness is reduced to 50 mm, the following situations arise: With the usual increase in the casting speed from 5 to 6 m / min. and constant casting performance, the surface temperature of the slab drops and it enters the compensating furnace at only 1067 ° C (point g)). In order to enable an increase in the slab temperature, the strand can according to the invention
Bereich des Rollganges isoliert und damit die Temperaturminderung verringert werden (siehe Pfeil in Richtung Punkt III). Im diesem Fall führt dies zur konstanten Produktionsmenge (siehe die Gerade durch die Punkte a) und k)).Insulated area of the roller table and thus the temperature reduction can be reduced (see arrow in direction III). In this case, this leads to a constant production quantity (see the straight line through points a) and k)).
Wird hingegen die Gießgeschwindigkeit stärker erhöht als bei einer Steigerung bei konstanter Dicke der Bramme entsprechen würde, etwa auf ihren maximalen Wert gebracht und die Berücksichtigung der Einstellung der Sumpfspitze am Ende der Maschine, so tritt eine Temperaturerhöhung ein, im vorliegenden Fall werden 1150 °C beim Eintritt in den Ausgleichofen erwartet (Punkt h)). Sollte diese Temperatur für das gewünschte Walzverfahren zu hoch ist, so kann durch Kühlung dem Strang Wärme entzogen werden.If, on the other hand, the casting speed is increased more than would be the case with an increase with a constant thickness of the slab, brought to its maximum value and taking into account the setting of the sump tip at the end of the machine, a temperature increase occurs, in the present case 1150 ° C. Entry into the equalization furnace expected (point h)). If this temperature is too high for the desired rolling process, heat can be extracted from the strand by cooling.
Der Punkt i) zeigt die zu erwartenden Kapazitäts-Temperaturerhöhungen bei einer Brammendicke von 55 mm und einer möglichen Gießgeschwindigkeit von 6 m/min.The point i) shows the expected capacity temperature increases with a slab thickness of 55 mm and a possible casting speed of 6 m / min.
Insgesamt zeigt sich, daß bei der maximalen Geschwindigkeit von 7,2 m/min. und einem ggf. durchgeführten Gießwalzen von 60 auf 50 mm Brammendicke eine Steigerung der Gießleistung von 2,31 t/min auf 2,77 t/min. realistisch ist. Dabei wird eine Temperaturerhöhung der Bramme von 1111 auf 1150 ° C am Einlauf in den Ausgleichofen nach freier Abstrahlung zwischen Stranggießmaschine und Ausgleichofen erzielt.Overall, it can be seen that at the maximum speed of 7.2 m / min. and a possibly performed casting roll from 60 to 50 mm slab thickness, an increase in the casting performance from 2.31 t / min to 2.77 t / min. is realistic. The temperature of the slab is increased from 1111 to 1150 ° C at the inlet to the equalization furnace after free radiation between the continuous casting machine and the equalization furnace.
Die Geraden D zeigen die Verhältnisse bei den jeweiligen Brammendicken, wobei der Index jeweils die Dicke D in mm angibt. Die römischen Ziffern zeigen die Einflußmöglichkeit bei den einzelnen Brammendicken bezüglich der Einflußnahme auf die Temperatur der Bramme und zwar:The straight lines D show the conditions for the respective slab thicknesses, the index indicating the thickness D in mm. The Roman numerals show the possibility of influencing the individual slab thicknesses with regard to influencing the temperature of the slab, namely:
I Variation der Spritzwassermenge in Iwasser/Kg Stahl' II Kühlung zwischen der Stranggießmaschine und dem Ofen.I varying the amount of spray in Iwasser / Kg steel 'II cooling between the continuous casting machine and the furnace.
III Isolierung zwischen der Stranggießmaschine und dem Ausgleichofen.III Insulation between the continuous casting machine and the leveling furnace.
Die eingekreisten Werte zeigen die relative Gießleistung. So ist beispielsweise im Punkt k) eine Leistungssteigerung bezogen zur Gießleistung im Punkt a) um den Faktor 1 ,2 möglich. The circled values show the relative casting performance. For example, in point k) an increase in output in relation to the casting output in point a) by a factor of 1, 2 is possible.
PositionslistePosition list
10 Stranggießmaschine10 continuous casting machine
11 Kokille 12 Kokillenaustritt11 mold 12 mold outlet
13 Mündung der Stranggießmaschine13 Mouth of the continuous casting machine
TransporteinrichtungTransport device
21 Roligang 22 Quertrenneinrichtung/Schere21 Roligang 22 cross cutting device / scissors
30 Einrichtung zur Beeinflußung des Wärmeenergieinhaltes des Stranges30 Device for influencing the thermal energy content of the strand
31 Kühlelemente/Düsen31 cooling elements / nozzles
32 Warmhalteelemente/Haube32 warming elements / hood
RegeleinrichtungControl device
41 Thermofühler41 thermocouples
42 Aktuatoren42 actuators
50 Ausgleichofen50 equalizing furnace
51 Quertransportofen 52 Rollenherd51 Transverse oven 52 Roller hearth
60 Walzwerk60 rolling mill
S StrangS strand
B Flüssige Sumpfspitze B Liquid sump tip

Claims

Patentansprüche claims
1. Verfahren zum Betreiben einer Stranggießanlage mit einer eine stationäre Kokille aufweisende Stranggießmaschine, die über einen Rollgang mit einem Ausgleichsofen verbunden ist, dadurch gekennzeichnet, daß nach Festlegung des Brammenformates am Kokillenaustritt von den Gießparametern mindestens die Gießgeschwindigkeit in der Weise eingestellt wird, daß die Bramme bei Eintritt in den Ausgleichsofen die gewünschte Walztemperatur des zu erzeugenden Warmbandes besitzt und sich die1. A method for operating a continuous caster with a stationary mold continuous casting machine, which is connected via a roller table with a compensating furnace, characterized in that after determining the slab format at the mold outlet from the casting parameters, at least the casting speed is set in such a way that the slab when entering the equalization furnace has the desired rolling temperature of the hot strip to be produced and the
Sumpfspitze stets im Mündungsbereich der Stranggießmaschine befindet, und daß Maßnahmen zur Beeinflußung des Wärmeenergieinhaltes der Bramme nach Verlassen der Stranggießmaschine getroffen werden.Bottom tip is always in the mouth area of the continuous casting machine, and that measures to influence the thermal energy content of the slab are taken after leaving the continuous casting machine.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß das Brammenformat nach Verlassen der Kokille in der Bandgießmaschine durch Gießwalzen reduziert wird.2. The method according to claim 1, characterized in that the slab format is reduced after leaving the mold in the strip casting machine by casting rolls.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß dem durcherstarrten Strang durch ein Kühlmedium Wärme entzogen wird.3. The method according to claim 1 or 2, characterized in that the solidified strand is removed by a cooling medium heat.
4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der durcherstarrte Strang isoliert geführt wird, so daß ein Abstrahlen der Wärme minimiert wird.4. The method according to claim 1 or 2, characterized in that the solidified strand is performed isolated, so that radiation of the heat is minimized.
5. Verfahren nach einem der o.g. Ansprüche, dadurch gekennzeichnet, daß bei Änderung der Brammendicke die Gießgeschwindigkeit um ein Maß geändert wird, das größer ist als das (umgekehrte) Verhältnis der Querschnittsflächen bei der Formatumstellung. 5. The method according to any one of the above claims, characterized in that when changing the slab thickness, the casting speed is changed by an amount that is greater than the (reverse) ratio of the cross-sectional areas in the format change.
6. Stranggießanlage mit einer eine stationäre Kokille aufweisenden Stranggießmaschine, die über einen Rollgang mit einem Ausgleichofen verbunden ist, zur Durchführung des Verfahrens nach Anspruch 1 , dadurch gekennzeichnet, daß im Bereich des Rollganges (21) eine den Strang (S) in Achsrichtung umhüllende Einrichtung (30) vorgesehen ist, die Vorrichtungen (31 , 32) zur Beeinflußung des Wärmeenergieinhaltes des Stranges (S) besitzt.6. Continuous caster with a stationary mold continuous casting machine, which is connected via a roller table with a compensating furnace, for carrying out the method according to claim 1, characterized in that in the area of the roller table (21) a strand (S) enveloping device in the axial direction (30) is provided, which has devices (31, 32) for influencing the thermal energy content of the strand (S).
7. Stranggießanlage nach Anspruch 6, dadurch gekennzeichnet, daß die Vorrichtung (31) zur Beeinflußung des Wärmeenergieinhaltes des Stranges (S) Düsen zum Versprühen von Wasser aufweist.7. Continuous casting installation according to claim 6, characterized in that the device (31) for influencing the thermal energy content of the strand (S) has nozzles for spraying water.
8. Stranggießanlage nach Anspruch 6, dadurch gekennzeichnet, daß die Vorrichtung (32) zur Beeinflußung des Wärmeenergieinhaltes des Stranges eine haubenförmige Wärmeisolierung ist.8. Continuous caster according to claim 6, characterized in that the device (32) for influencing the thermal energy content of the strand is a hood-shaped thermal insulation.
9. Stranggießanlage nach Anspruch 8, dadurch gekennzeichnet, daß die Hauben (32) Konstruktionselemente (33) besitzen, durch die diese leicht demontierbar sind.9. Continuous caster according to claim 8, characterized in that the hoods (32) have structural elements (33) through which these are easily removable.
10. Stranggießanlage nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß im Bereich des Rollganges (21) Thermofühler (41) installiert sind, die mit Aktuatoren (42) in Verbindung stehen, mit denen die Menge des Kühlmittels bzw. die abstrahlbare Wärmemenge gesteuert wird. 10. Continuous caster according to claim 7 or 8, characterized in that in the area of the roller table (21) thermal sensors (41) are installed, which are connected to actuators (42) with which the amount of coolant or the amount of heat that can be radiated is controlled .
EP96925644A 1995-07-31 1996-07-26 Method for operating a continuous casting plant Expired - Lifetime EP0841994B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19529046A DE19529046A1 (en) 1995-07-31 1995-07-31 Method and device for operating a continuous caster
DE19529046 1995-07-31
PCT/DE1996/001441 WO1997004891A1 (en) 1995-07-31 1996-07-26 Method and device for operating a continuous casting plant

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EP0841994A1 true EP0841994A1 (en) 1998-05-20
EP0841994B1 EP0841994B1 (en) 2001-08-29

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JP (1) JP3043075B2 (en)
KR (1) KR100304759B1 (en)
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AT (1) ATE204792T1 (en)
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CA (1) CA2228445C (en)
DE (4) DE19529046A1 (en)
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ES (1) ES2159750T3 (en)
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CN103302262B (en) * 2013-06-25 2015-05-27 济钢集团有限公司 Continuous casting plate blank surface quenching technology and used device
CN110303047B (en) * 2019-07-08 2020-11-03 东北大学 Continuous casting hot core rolling system and method
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US5915457A (en) 1999-06-29
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DK0841994T3 (en) 2001-10-08
KR19990036021A (en) 1999-05-25
RU2138345C1 (en) 1999-09-27
WO1997004891A1 (en) 1997-02-13
EP0841994B1 (en) 2001-08-29
CN1132707C (en) 2003-12-31
DE19680625C1 (en) 2001-07-26
ES2159750T3 (en) 2001-10-16
CN1192171A (en) 1998-09-02
DE19529046A1 (en) 1997-02-06
JPH11500360A (en) 1999-01-12
DE59607595D1 (en) 2001-10-04
AU6610796A (en) 1997-02-26
AU715643B2 (en) 2000-02-10
CA2228445A1 (en) 1997-02-13
KR100304759B1 (en) 2001-11-22
CA2228445C (en) 2001-09-04
BR9609824A (en) 1999-07-06
DE19680625D2 (en) 1998-07-23
NZ313594A (en) 1998-11-25

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