EP0841994B1 - Method for operating a continuous casting plant - Google Patents
Method for operating a continuous casting plant Download PDFInfo
- Publication number
- EP0841994B1 EP0841994B1 EP96925644A EP96925644A EP0841994B1 EP 0841994 B1 EP0841994 B1 EP 0841994B1 EP 96925644 A EP96925644 A EP 96925644A EP 96925644 A EP96925644 A EP 96925644A EP 0841994 B1 EP0841994 B1 EP 0841994B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slab
- continuous casting
- furnace
- 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.)
- Expired - Lifetime
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 41
- 238000005096 rolling process Methods 0.000 claims description 14
- 230000005855 radiation Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 239000002826 coolant Substances 0.000 claims 1
- 239000007791 liquid phase Substances 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 description 9
- 230000008023 solidification Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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 stationary continuous casting machine that has a roller table with a Compensating oven is connected.
- EP 0 264 459 B1 describes a process for producing hot-rolled steel strip Continuously cast slabs known in which the solidified cast strand in sections the same length is separated and these sections are successively introduced into an oven in which they are saved over a period of time in order to Roller table to be handed over to a rolling finishing train.
- the liquefied material for Formation of 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 of the The cast furnace cools down and runs from the roller table at a temperature of about 1150 ° C on a runway located in the storage furnace.
- the invention has set itself the goal of creating a method with which simple Average the casting parameters of a given production chain, consisting of Continuous caster, leveling furnace and rolling mill, are changeable while doing the Casting performance is retained at least.
- the invention is based on the finding that when the continuous casting stage is combined with the Rolling stage in billet, slab and especially in Thin slab pouring the energy content of the strand directly behind the Continuous caster following temperature compensation furnace the roller hearth or Cross conveyor furnace is of great importance. Surprisingly, it turns out that the Energy content of the slab when entering the equalization furnace as a guide for the Operation of the entire system can be used.
- the energy content of the Slab entering the compensating furnace to the desired rolling temperature of the generating hot strip set.
- the oven can be operated so that the Strang no energy is to be supplied, but that it only to balance the Slab temperature is used.
- the casting parameters set in such a way that the slab when the Compensating furnace of the desired rolling temperature of the hot strip to be produced corresponds.
- the system now allows casting performance with constant casting thickness and to increase the maximum casting speed and the heat content of the Control slab entering slab.
- the parameters are like this set that the swamp tip is always in the mouth area of the Belt casting machine is located.
- active Cooling can be specified or removed by a heat Insulating device largely prevents heat radiation.
- a metallurgical length of 9.3 m is provided.
- Will the Solidification thickness from 60 to 50 mm by casting rolls or by converting the Continuous casting machine is reduced while maintaining the casting speed and taking into account that the radiation losses depending on the decreasing slab and at the same time the solidification time of a strand with decreasing thickness decreases with the square of half the thickness Production output reduced.
- This temperature increase can lead to the slab in the area of Roller table in front of the equalization furnace by cooling to the desired one Slab temperature must be set at the furnace inlet.
- FIG. 1 shows a continuous casting machine 10 with a stationary mold 11.
- Strand S extends the swamp tip F to the mouth 13 of the Continuous casting machine 10.
- the continuous casting machine 10 is followed by a roller table 21, which is one if possible short connection, for example a length of 10 m, to the equalization furnace 50 manufactures.
- a transverse transport oven 51 is provided and in A roller hearth furnace 52 is provided in the lower part of the image.
- the continuous casting machine 10 has a metallurgical length of 9.3 m
- Roller table 21 has a length of 10 m
- the slabs are by a Cross separator 22 separated to a length of about 43 m, so that the Transverse furnace 51 a length of around 45 m and the roller hearth furnace 52 a 150 m long.
- a conventional rolling mill 60 is connected to the equalizing furnace 51 or 52 Production of hot strips of 1 mm thickness. For example, from a one. or two-stand preliminary stage with subsequent winding station and finishing train consist.
- 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)).
- the strand can be isolated in the 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)).
- the casting speed is increased more than with an increase in would correspond to the constant thickness of the slab, approximately to its maximum value brought and taking into account the setting of the swamp tip at the end of the Machine, so a temperature increase occurs, in the present case 1150 ° C expected when entering the equalization furnace (point h)). Should this temperature for the If the desired rolling process is too high, the strand can be heated by cooling be withdrawn.
- the point i) shows the expected capacity temperature increases at 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 indicates the thickness D in mm.
- the circled values show the relative casting performance. For example, in Point k) a performance increase related to the casting performance in point a) by the Factor 1.2 possible.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Continuous Casting (AREA)
- Casting Devices For Molds (AREA)
- Treatment Of Fiber Materials (AREA)
- Manufacturing And Processing Devices For Dough (AREA)
- Pinball Game Machines (AREA)
- Body Structure For Vehicles (AREA)
- Details Of Cameras Including Film Mechanisms (AREA)
- Supports For Plants (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
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.The invention relates to a method for operating a continuous caster with a stationary continuous casting machine that has a roller table with a Compensating oven is connected.
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.
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 procedure must be specified Strand thickness bound with appropriate casting speed. Changes in Casting parameters regularly have production losses, quality reductions and Cost increases result.
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.This leads to a reduction in the casting speed with a constant solidification thickness, if so no casting rolling is possible, due to severe temperature performance losses additional cooling of the slab in the continuous caster as well as the long dwell time of the Stranges on his way to the equalization furnace.
Außerdem führt die aus dieser Schrift bekannte Querteilanlage, da hier keine Schere eingesetzt wird, zu großen Strahlungsverlusten bedingt durch die lange Verfahrenszeit.In addition, the cross-cutting system known from this document leads because there are no scissors is used, too large radiation losses due to the long process time.
Die Erfindung hat sich das Ziel gesetzt, ein Verfahren zu schaffen, mit dem 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 which simple Average the casting parameters of a given production chain, consisting of Continuous caster, leveling furnace and rolling mill, are changeable while doing the Casting performance is retained at least.
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 finding that when the continuous casting stage is combined with the Rolling stage in billet, slab and especially in Thin slab pouring the energy content of the strand directly behind the Continuous caster following temperature compensation furnace the roller hearth or Cross conveyor furnace is of great importance. Surprisingly, it turns out that the Energy content of the slab when entering the equalization furnace as a guide for the Operation of the entire system can be used. The energy content of the Slab entering the compensating furnace to the desired rolling temperature of the generating hot strip set. The oven can be operated so that the Strang no energy is to be supplied, but that it only to balance the Slab temperature is used.
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 einer 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.With the selection of 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, for example, a basic design a solidification thickness of 60 mm at a casting speed of 5 m / min. the Solidification thickness of the slab reduced and influence on the casting speed is taken into account, apart from the influencing variable such as strand cooling or insulation between Continuous casting machine and 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 one Heat content of the slab directly into one of the continuous caster downstream furnace is made possible by casting rolling in the casting machine, i.e. the reduction of the casting thickness during solidification.
Erfindungsgemäß werden nach Festlegung des Brammenformates vom Kokillenaustritt die Gießparameter in der Weise eingestellt, daß die Bramme bei Eintritt des 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 der 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.According to the invention, after determining the slab format from the mold outlet the casting parameters set in such a way that the slab when the Compensating furnace of the desired rolling temperature of the hot strip to be produced corresponds. The system now allows casting performance with constant casting thickness and to increase the maximum casting speed and the heat content of the Control slab entering slab. The parameters are like this set that the swamp tip is always in the mouth area of the Belt casting machine is located. Depending on the current energy content of the The slab is immediately behind the continuous casting machine by active Cooling can be specified or removed by a heat Insulating device largely prevents heat radiation.
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.In the basic design of a continuous caster with a solidification thickness of Slab of 60 mm and a maximum possible speed of 5 m / min for example, a metallurgical length of 9.3 m is provided. Will the Solidification thickness from 60 to 50 mm by casting rolls or by converting the Continuous casting machine is reduced while maintaining the casting speed and taking into account that the radiation losses depending on the decreasing slab and at the same time the solidification time of a strand with decreasing thickness decreases with the square of half the thickness Production output reduced.
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°C auf 1150°C. However, contrary to the usual procedure, the casting speed in Dependence of the decreasing thickness with the same width of the slab on their maximum value of 7.2 m / min. Casting speed increases, so the casting performance from 2.31 to 2.77 t / min., i.e. increased from 100 to 120%. The casting performance leaves this measure not only maintains, but actually increases. At this In terms of procedures, the energy content increases at the same time and thus the corresponding one average slab temperature at the furnace inlet from 1111 ° C to 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.This temperature increase can lead to the slab in the area of Roller table in front of the equalization furnace by cooling to the desired one Slab temperature must be set at the furnace inlet.
Durch die Verfahrenstechnik ist eine energieneutrale Ofenfahrweise unter 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.Due to the process engineering, an energy-neutral furnace operation is under Ensuring the desired energy content of the slab at the furnace inlet and the appropriate rolling temperature at the furnace outlet possible. Such a system leaves also a different rolling temperature from slab to slab too, since the furnace essentially only works as a leveling furnace and therefore works neutral and none Heating has more to do.
Neben diesen Energievorteilen sind noch weitere Vorteile zu nennen wie:
- 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 due to the casting and rolling process during solidification
- An increased slag lubrication film in the mold,
the one:
reduced heat build-up in the mold leads to a lower thermal load: - the strand shell - reducing tension and avoiding cracks - and
- the mold plate - increasing the mold durability.
Ein Beispiel der Erfindung ist in der beiliegenden Zeichnung dargelegt. Dabei zeigt die
Figur 1- Ein Schema der Stranggießanlage.
- Figur 2
- Ein Diagramm der Brammendurchschnittstemperatur in Abhängigkeit von der Gießgeschwindigkeit.
- Figure 1
- A diagram of the continuous caster.
- 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 der
Stranggießmaschine 10. FIG. 1 shows a
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.The
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.There are also insulating hoods in the area of the roller table 21 in the upper part of the
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
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
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 eine 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. 2 shows the standard situation in a) with a basic design of one Solidification thickness of 60 mm at the entrance of the equalization furnace, which is 10 m away from the End of the continuous caster is provided, and a casting speed of 5 m / min. In the continuous casting machine, approx. 0.3 to 0.5 l water / kg steel is used Spray water cooled so far, so the slab at the end of the machine Average speed of 1325 ° C has. At the speed of 5 m / min. this slab has a temperature of when it enters the equalization furnace 1111 ° C.
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 im
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)).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, according to the invention the strand can be isolated in the 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.On the other hand, the casting speed is increased more than with an increase in would correspond to the constant thickness of the slab, approximately to its maximum value brought and taking into account the setting of the swamp tip at the end of the Machine, so a temperature increase occurs, in the present case 1150 ° C expected when entering the equalization furnace (point h)). Should this temperature for the If the desired rolling process is too high, the strand can be heated by cooling be withdrawn.
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 at 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 rolls from 60 to 50 mm slab thickness Casting performance increased from 2.31 t / min to 2.77 t / min. is realistic. Doing so a temperature increase of the slab from 1111 to 1150 ° C at the inlet into the Compensation furnace after free radiation between the continuous casting machine and Equalization furnace achieved.
Die Geraden D zeigen die Verhältnisse bei den jeweiligen Brammendicken, wobei der Index jeweils die Dicke D in mm angibt. The straight lines D show the conditions for the respective slab thicknesses, the Index indicates the thickness D in mm.
Die römischen Ziffern zeigen die Einflußmöglichkeit bei den einzelnen Brammendicken
bezüglich der Einflußnahme auf die Temperatur der Bramme und zwar:
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) a performance increase related to the casting performance in point a) by the Factor 1.2 possible.
- 1010th
- StranggießmaschineContinuous casting machine
- 1111
- KokilleMold
- 1212th
- KokillenaustrittMold exit
- 1313
- Mündung der StranggießmaschineMouth of the continuous casting machine
- 2121
- RollgangRoller table
- 2222
- Quertrenneinrichtung/SchereCross cutting device / scissors
- 3030th
- Einrichtung zur Beeinflußung des Wärmeenergieinhaltes des StrangesDevice for influencing the thermal energy content of the strand
- 3131
- Kühlelemente/DüsenCooling elements / nozzles
- 3232
- Warmhalteelemente/HaubeWarming elements / hood
- 4141
- ThermofühlerThermocouple
- 4242
- AktuatorenActuators
- 5050
- AusgleichofenLeveling furnace
- 5151
- QuertransportofenTransverse oven
- 5252
- RollenherdRoller hearth
- 6060
- WalzwerkRolling mill
- ss
- Strangstrand
- BB
- Flüssige SumpfspitzeLiquid swamp tip
Claims (4)
- A method for operating a continuous casting plant, having a continuous casting machine comprising a stationary mould, which machine is connected to an equalising furnace via a roller table,
characterised in that,
once the slab format is fixed at the mould outlet, at least the casting parameter relating to casting rate is adjusted in such a way that the slab exhibits the desired rolling temperature for the hot strip to be produced when it enters the equalising furnace and the tip of the liquid phase is constantly located in the mouth area of the continuous casting machine, and in that measures are taken to influence the thermal energy content of the slab after it has left the continuous casting machine, the casting rate being varied upon variation of the slab thickness by an amount which is greater than the inverse ratio of the cross-sectional areas upon format modification. - A method according to claim 1,
characterised in that,
after the slab has left the mould, the slab format is reduced in the strip casting machine by direct reduction. - A method according to claim 1 or claim 2,
characterised in that
heat is withdrawn from the thoroughly solidified strand by a cooling medium. - A method according to claim 1 or claim 2,
characterised in that
the thoroughly solidified strand is guided in insulated manner, to minimise heat radiation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19529046 | 1995-07-31 | ||
| DE19529046A DE19529046A1 (en) | 1995-07-31 | 1995-07-31 | Method and device for operating a continuous caster |
| PCT/DE1996/001441 WO1997004891A1 (en) | 1995-07-31 | 1996-07-26 | Method and device for operating a continuous casting plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0841994A1 EP0841994A1 (en) | 1998-05-20 |
| EP0841994B1 true EP0841994B1 (en) | 2001-08-29 |
Family
ID=7768930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96925644A Expired - Lifetime EP0841994B1 (en) | 1995-07-31 | 1996-07-26 | Method for operating a continuous casting plant |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US5915457A (en) |
| EP (1) | EP0841994B1 (en) |
| JP (1) | JP3043075B2 (en) |
| KR (1) | KR100304759B1 (en) |
| CN (1) | CN1132707C (en) |
| AT (1) | ATE204792T1 (en) |
| AU (1) | AU715643B2 (en) |
| BR (1) | BR9609824A (en) |
| CA (1) | CA2228445C (en) |
| DE (4) | DE19529046A1 (en) |
| DK (1) | DK0841994T3 (en) |
| ES (1) | ES2159750T3 (en) |
| NZ (1) | NZ313594A (en) |
| RU (1) | RU2138345C1 (en) |
| WO (1) | WO1997004891A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008055650A1 (en) | 2008-10-29 | 2010-05-06 | Sms Siemag Aktiengesellschaft | Method for minimizing energy demand and carbon dioxide ejection in a continuous furnace arranged downstream to a thin-slab plant, comprises entering material dependent cool strategy and threshold value in model calculator |
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| JP3726506B2 (en) * | 1998-05-28 | 2005-12-14 | Ｊｆｅスチール株式会社 | Billet water cooling method |
| AU4596899A (en) * | 1998-07-10 | 2000-02-01 | Ipsco Inc. | Method and apparatus for producing martensite- or bainite-rich steel using steckel mill and controlled cooling |
| ES2238224T3 (en) * | 1999-07-06 | 2005-09-01 | Sms Demag Ag | PROCEDURE AND SYSTEM TO CONTROL THE BRASS IN A ROPE COLADA MACHINE. |
| DE10357363B4 (en) * | 2003-12-09 | 2006-02-09 | Ispat Industries Ltd., Taluka-Pen | Method and plant for casting and immediately subsequent rolling of casting strands of metal, in particular of steel materials, preferably thin strands |
| WO2007061412A1 (en) * | 2005-11-25 | 2007-05-31 | Cache Folkman | Cooling steel slabs to prevent surface cracking |
| IT1400913B1 (en) * | 2010-06-24 | 2013-07-02 | Danieli Off Mecc | PROCEDURE AND PLANT FOR CASTING AND LAMINATION TO MAKE LONG METAL LAMINATE PRODUCTS |
| PL2412460T3 (en) | 2010-07-26 | 2019-09-30 | Primetals Technologies Italy S.R.L. | Apparatus and method for production of metal elongated products |
| AT512399B1 (en) | 2012-09-10 | 2013-08-15 | Siemens Vai Metals Tech Gmbh | Method for producing a microalloyed tubular steel in a cast-rolled composite plant and microalloyed tubular steel |
| 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 |
| CN110681697A (en) * | 2019-09-20 | 2020-01-14 | 中冶赛迪工程技术股份有限公司 | Long material production line process equipment suitable for direct rolling |
| DE102020205077A1 (en) * | 2019-09-23 | 2021-03-25 | Sms Group Gmbh | Device and method for the production and further treatment of slabs |
| CN114654175B (en) * | 2022-04-20 | 2023-09-19 | 浙江齐飞铝业有限公司 | Automatic processing system for aluminum alloy forming |
| CN115041655A (en) * | 2022-07-04 | 2022-09-13 | 重庆钢铁股份有限公司 | Method for preventing casting blank from bending under high temperature |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5422777B2 (en) * | 1973-09-17 | 1979-08-09 | ||
| JPS5918146B2 (en) * | 1978-06-29 | 1984-04-25 | 新日本製鐵株式会社 | Method for manufacturing hot rolled steel materials |
| JPS5719144A (en) * | 1980-07-10 | 1982-02-01 | Nippon Steel Corp | Conveying method for high-temperature ingot |
| JPS57127505A (en) * | 1981-01-22 | 1982-08-07 | Nippon Steel Corp | Direct rolling manufacturing device for steel |
| JPS57202907A (en) * | 1981-06-09 | 1982-12-13 | Nippon Steel Corp | Production of shape steel |
| JPH0620625B2 (en) * | 1985-09-17 | 1994-03-23 | 新日本製鐵株式会社 | Temperature control method of steel slab in continuous casting process |
| DE3823861A1 (en) * | 1988-07-14 | 1990-01-18 | Thyssen Stahl Ag | METHOD AND SYSTEM FOR PRODUCING A STEEL TAPE THICKNESS THAN 10 MM |
| DE3839954A1 (en) * | 1988-11-26 | 1990-05-31 | Schloemann Siemag Ag | PLANT FOR PRODUCING HOT-ROLLED STEEL STRIP |
| JP3152241B2 (en) * | 1990-06-12 | 2001-04-03 | 株式会社日立製作所 | Hot thin plate manufacturing equipment and manufacturing method |
| AT398396B (en) * | 1993-02-16 | 1994-11-25 | Voest Alpine Ind Anlagen | METHOD FOR PRODUCING A TAPE, PRE-STRIP OR A LAM |
| EP0625383B1 (en) * | 1993-05-17 | 1998-02-25 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Line to produce strip and/or sheet |
| EP0650790B2 (en) * | 1993-10-29 | 2013-10-16 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Method for thermal surface treatment in a continuous casting machine |
| DE4402402B4 (en) * | 1994-01-27 | 2004-05-13 | Sms Demag Ag | Process for producing hot-rolled steel strip from continuously cast starting material and plant for carrying out the process |
| US5396695A (en) * | 1994-03-22 | 1995-03-14 | Danieli & C. Officine Meccaniche Spa | Method of controlling a time period between continuously cast slabs entering a rolling stand |
| IT1280207B1 (en) * | 1995-08-02 | 1998-01-05 | Danieli Off Mecc | CONTINUOUS CASTING PROCESS FOR LONG PRODUCTS AND RELATED CONTINUOUS CASTING LINE |
-
1995
- 1995-07-31 DE DE19529046A patent/DE19529046A1/en not_active Withdrawn
-
1996
- 1996-07-26 BR BR9609824A patent/BR9609824A/en not_active IP Right Cessation
- 1996-07-26 ES ES96925644T patent/ES2159750T3/en not_active Expired - Lifetime
- 1996-07-26 WO PCT/DE1996/001441 patent/WO1997004891A1/en active IP Right Grant
- 1996-07-26 EP EP96925644A patent/EP0841994B1/en not_active Expired - Lifetime
- 1996-07-26 NZ NZ313594A patent/NZ313594A/en unknown
- 1996-07-26 DE DE59607595T patent/DE59607595D1/en not_active Expired - Fee Related
- 1996-07-26 AT AT96925644T patent/ATE204792T1/en not_active IP Right Cessation
- 1996-07-26 DK DK96925644T patent/DK0841994T3/en active
- 1996-07-26 DE DE19680625A patent/DE19680625C1/en not_active Expired - Fee Related
- 1996-07-26 CA CA002228445A patent/CA2228445C/en not_active Expired - Fee Related
- 1996-07-26 RU RU98103513A patent/RU2138345C1/en not_active IP Right Cessation
- 1996-07-26 KR KR1019980700686A patent/KR100304759B1/en not_active IP Right Cessation
- 1996-07-26 CN CN96196018A patent/CN1132707C/en not_active Expired - Fee Related
- 1996-07-26 AU AU66107/96A patent/AU715643B2/en not_active Ceased
- 1996-07-26 US US09/011,491 patent/US5915457A/en not_active Expired - Lifetime
- 1996-07-26 DE DE19680625D patent/DE19680625D2/en not_active Expired - Lifetime
- 1996-07-26 JP JP9507114A patent/JP3043075B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008055650A1 (en) | 2008-10-29 | 2010-05-06 | Sms Siemag Aktiengesellschaft | Method for minimizing energy demand and carbon dioxide ejection in a continuous furnace arranged downstream to a thin-slab plant, comprises entering material dependent cool strategy and threshold value in model calculator |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6610796A (en) | 1997-02-26 |
| AU715643B2 (en) | 2000-02-10 |
| RU2138345C1 (en) | 1999-09-27 |
| DE59607595D1 (en) | 2001-10-04 |
| KR19990036021A (en) | 1999-05-25 |
| CN1132707C (en) | 2003-12-31 |
| KR100304759B1 (en) | 2001-11-22 |
| DE19529046A1 (en) | 1997-02-06 |
| CA2228445C (en) | 2001-09-04 |
| ATE204792T1 (en) | 2001-09-15 |
| ES2159750T3 (en) | 2001-10-16 |
| DE19680625C1 (en) | 2001-07-26 |
| NZ313594A (en) | 1998-11-25 |
| DK0841994T3 (en) | 2001-10-08 |
| BR9609824A (en) | 1999-07-06 |
| JP3043075B2 (en) | 2000-05-22 |
| DE19680625D2 (en) | 1998-07-23 |
| WO1997004891A1 (en) | 1997-02-13 |
| CN1192171A (en) | 1998-09-02 |
| CA2228445A1 (en) | 1997-02-13 |
| JPH11500360A (en) | 1999-01-12 |
| EP0841994A1 (en) | 1998-05-20 |
| US5915457A (en) | 1999-06-29 |
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