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EP0746434A1 - Process and device for cooling molten steel - Google Patents

Process and device for cooling molten steel

Info

Publication number
EP0746434A1
EP0746434A1 EP95910398A EP95910398A EP0746434A1 EP 0746434 A1 EP0746434 A1 EP 0746434A1 EP 95910398 A EP95910398 A EP 95910398A EP 95910398 A EP95910398 A EP 95910398A EP 0746434 A1 EP0746434 A1 EP 0746434A1
Authority
EP
European Patent Office
Prior art keywords
gas
strand
steel
steel strand
cooling
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
EP95910398A
Other languages
German (de)
French (fr)
Other versions
EP0746434B1 (en
Inventor
Wolfgang Reichelt
Ulrich Urlau
Paul Freier
Karl-Heinz Spitzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0746434A1 publication Critical patent/EP0746434A1/en
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0697—Accessories therefor for casting in a protected atmosphere
    • 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
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

  • the invention relates to a method for cooling molten steel, in particular strip casting, in which at least part of the liquid metal emerging from a nozzle of a metallurgical vessel solidifies by contact with a cooling surface, and an apparatus for carrying out the method.
  • the liquid metal is led into a cooled form, whereby a solidification front forms from the outside to the inside of the strand due to the contact with the cooling form.
  • an inert gas it is known to supply them with an inert gas.
  • the gas used here is introduced into the housing in an undirected manner and is used exclusively for cooling and usually to reduce scale formation.
  • the inert gas was brought into contact with either the liquid or the already solidified surface.
  • BandgieQen as is known from DE 38 10 302, for example, the liquid metal is placed on a cooled endless belt and the free surface of the belt strand cools during its transport on the conveyor belt, so that the free surface in the front area near the nozzle is still free is liquid and then solidifies by cooling.
  • the invention has set itself the goal of creating a method and a corresponding device with which influence on the surface of the metallic extrudate is exerted both on its shape and on its quality.
  • a gas stream is directed onto the surface of the freely accessible liquid steel strand immediately after it leaves the metal nozzle of the metallurgical vessel.
  • the strand surface is exposed to a gas that forms an inert atmosphere at least until the steel strand has completely solidified.
  • inert gases such as argon or nitrogen are used in particular.
  • the use of the gas in the vicinity of the nozzle specifically influences the heat dissipation and the surface tension.
  • the inventors propose either to heat the gas and thereby prevent the strand surface from solidifying for a predeterminable distance, or in another embodiment to cool the 6as to such an extent that it is in liquid form is promoted.
  • the temperature of the gas can be pre-set in both extreme areas.
  • the gas can also be used at room temperature.
  • the gas in a quantity and at a speed to the surface of the steel strand in such a way that the shape of the casting strand is influenced.
  • the surface can be deliberately pressed in and, for example, the profile can be given a crown in the form of a crown.
  • the gas can also be controlled in such a way that the gas kinetics additionally have a positive influence in reducing the formation of bumps.
  • Figure 1 schematically shows a longitudinal section through the casting machine
  • Figure 2 schematically shows a cross section.
  • FIG. 1 shows a metallurgical vessel 11, in which a metal melt M flows out of a metal nozzle 12.
  • the melt M is fed onto a conveyor belt 43, which is held as an endless belt by a drive drum 41 and a deflection drum 42.
  • a cooling device 44 is provided on the underside of the upper run of the conveyor belt 43, which cools the steel strand S, which is transported in the conveying direction s.
  • the metal strand 5 is surrounded by a housing 31, of which it is surrounded at the outlet 32 by a seal 33 to minimize the gas leakage.
  • Gas nozzles 25 are passed through the ceiling of the housing 31. These nozzles 25 have an angle between 0 and 45 ° with respect to the steel strand S. These gas nozzles 25 are connected to gas distributors 26 which are connected to a compressor 21 via feed lines 23. The gas nozzles 25 can be shut off individually by shut-off elements 24.
  • a heat exchanger 22 is arranged between the compressor 21 and the nozzles 25, with which the temperature of the gas forming a reduced atmosphere or of the inert gas can be predetermined.
  • the compressor 21 is connected to a gas supply station 29.
  • a connecting line 28 is provided, which connects the gas supply station 29 to the housing 31 in the region of the strand outlet 32 via a gas manifold 27.
  • FIG. 2 shows a cross section through a strip casting machine using the same position numbers as FIG. 1.
  • the arrangement of several gas nozzles 25 next to one another is shown, each of which has a shut-off element 24 and is connected to a distributor 26 which has the feed line 23.
  • a seal 34 is provided in the upper area of the deflection drum 42, which minimizes the leakage between the side cheeks of the housing 31 and the side plates of the drum 42.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Details (AREA)

Abstract

A process is disclosed for cooling molten steel, in particular by continuous casting of hoop-steel. At least part of the molten mass that leaves a metallurgical vessel through a metal nozzle solidifies when contacting a cooling surface. According to the invention, a gaseous stream that forms a reducing atmosphere is directed onto the surface of the freely accessible liquid hoop-steel immediately after it leaves the metal nozzle and the surface of the hoop-steel is exposed to this gaseous atmosphere at least until it is completely solidified.

Description

verfahren und Vorrichtung zum Kühlen schmelzflüssigen Stahlsmethod and device for cooling molten steel
Die Erfindung betrifft ein Verfahren zum Kühlen schmelzflüssigen Stahls, insbesondere Bandgieβen, bei dem mindestens ein Teil des aus einer Düse eines metallurgischen GefäQes austretenden Flüssigmetalls durch Kontakt mit einer Kühlfläche erstarrt, sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for cooling molten steel, in particular strip casting, in which at least part of the liquid metal emerging from a nozzle of a metallurgical vessel solidifies by contact with a cooling surface, and an apparatus for carrying out the method.
Beim kontinuierlichen GieBen oder StranggieQen wird das flüssige Metall in eine gekühlte Form geführt, wobei sich durch den Kontakt mit der Kühlform sich eine Erstarrungsfront von auβen beginnend zum Inneren des Stranges ausbildet. Zur Verbesserung der Qualität der Metallrohlinge ist bekannt, diesen ein inertes Gas zuzuführen.In continuous casting or continuous casting, the liquid metal is led into a cooled form, whereby a solidification front forms from the outside to the inside of the strand due to the contact with the cooling form. To improve the quality of the metal blanks, it is known to supply them with an inert gas.
So wird in der DE 05 21 63 928 vorgeschlagen, bei der Herstellung von Stahlrohlingen durch kontinuierliches Gießen eines Metallstrahls in eine gekühlte Form am oberen Teil der Form in der N he der Oberfläche des flüssigen Metalls über dem Metall inertes Gas einzuführen. Vorgeschlagen wird hierbei Stickstoff oder Argon, welches vorher durch Komprimieren und Absenken der Temperatur verflüssigt wird und in verflüssigtem Zustand auf die Oberfläche des Stahlrohlings aufgebracht wird.It is proposed in DE 05 21 63 928 to introduce inert gas into the production of steel blanks by continuously casting a metal jet into a cooled mold at the upper part of the mold near the surface of the liquid metal above the metal. Nitrogen or argon is proposed, which is liquefied beforehand by compressing and lowering the temperature and in liquefied state is applied to the surface of the steel blank.
Aus dieser Schrift ist es lediglich bekannt, flüssiges Metall einerFrom this document it is only known to be a liquid metal
Inertgasatmosphäre auszusetzen und den Gasstrahl so einzurichten, daQ das flüssige Metall des Rohrlings in eine Drehbewegung um eine senkrechte Achse versetzt wird.Expose to an inert gas atmosphere and set up the gas jet so that the liquid metal of the blank is rotated about a vertical axis.
Aus der Schrift DE 32 27 132 A1 ist es bekannt, einen aus einer Zumeβdüse austretenden Metallstrom in einen Schutzmantel aus inertem Gas, z. B. Argon oder Stickstoff einzuhüllen, um Luft von der Nähe der Metallschmelze fernzuhalten. Dieses unter Druck stehende inerte Gas schirmt den aus der Umgebungsluft stammenden Sauerstoff ab und verhindert dadurch eine Reoxidierung des freiliegenden Metallschmelzen-Miniskus. Eine weitergehende Beeinflussung des flüssigen Metalls entnimmt der Fachmann dieser Schrift nicht. Weiterhin ist der Einsatz inerten Gases zur Behandlung bereits erstarrter oder nur erwärmter metallischer Stränge oder Drähte bekannt. Erwähnt sei hier beispielsweise die Schrift DE 35 06 5S7A1, bei der ein Draht in einem Gehäuse einer Kühlkolonne einem leicht reduzierenden Gas ausgesetzt wird. Das hier eingesetzte Gas wird ungerichtet in das Gehäuse eingeführt und dient ausschließlich der Kühlung und üblicherweise der Verminderung einer Zunderbildung. Bei den zitierten Gieβverfahren wurde das inerte Gas entweder mit der flüssigen oder der bereits erstarrten Oberfläche in Kontakt gebracht. Beim BandgieQen, wie es etwa aus der Schrift DE 38 10 302 bekannt ist, wird das Flüssigmetall auf ein gekühles Endlosband aufgegeben und die freie Oberfläche des Bandstranges kühlt während seines Transportes auf dem Förderband ab, so daQ im vorderen Bereich in Düsennähe die freie Oberfläche noch flüssig ist und danach durch Abkühlung erstarrt. Die Erfindung hat sich das Ziel gesetzt, ein Verfahren und eine entsprechende Vorrichtung zu schaffen, mit der EinfluQ auf die Oberfläche des metallischen Stranggutes sowohl auf seine Form wie auf seine Qualität genommen wird.From the document DE 32 27 132 A1 it is known that a metal stream emerging from a metering nozzle in a protective jacket made of inert gas, for. B. envelop argon or nitrogen to keep air away from the vicinity of the molten metal. This pressurized inert gas shields the oxygen from the ambient air and thereby prevents re-oxidation of the exposed molten metal miniscus. The person skilled in the art does not take any further influence on the liquid metal from this document. Furthermore, the use of inert gas for the treatment of solidified or only heated metallic strands or wires is known. For example, DE 35 06 5S7A1 should be mentioned, in which a wire in a housing of a cooling column is exposed to a slightly reducing gas. The gas used here is introduced into the housing in an undirected manner and is used exclusively for cooling and usually to reduce scale formation. In the casting processes cited, the inert gas was brought into contact with either the liquid or the already solidified surface. In BandgieQen, as is known from DE 38 10 302, for example, the liquid metal is placed on a cooled endless belt and the free surface of the belt strand cools during its transport on the conveyor belt, so that the free surface in the front area near the nozzle is still free is liquid and then solidifies by cooling. The invention has set itself the goal of creating a method and a corresponding device with which influence on the surface of the metallic extrudate is exerted both on its shape and on its quality.
Die Erfindung erreicht dieses Ziel durch die kennzeichnenden Merkmale der Ansprüche 1 und 11.The invention achieves this aim by the characterizing features of claims 1 and 11.
Erfindungsgemaß wird ein Gasstrom auf die Oberfläche des frei zugänglichen flüssigen Stahlstranges unmittelbar nach seinem verlassen der Metalldüse des metallurgischen Gefäßes geleitet. Dabei wird die Strangoberfläche mindestens bis zum vollständigen Durcherstarren des Stahlstranges einem Gas ausgesetzt, das eine inerte Atmosphäre bildet. Neben der Möglichkeit des Einsatzes von sauerstoffarmen Gasen wie Rauchgas kommen hier insbesondere inerte Gase wie Argon oder Stickstoff zum Einsatz.According to the invention, a gas stream is directed onto the surface of the freely accessible liquid steel strand immediately after it leaves the metal nozzle of the metallurgical vessel. The strand surface is exposed to a gas that forms an inert atmosphere at least until the steel strand has completely solidified. In addition to the possibility of using low-oxygen gases such as flue gas, inert gases such as argon or nitrogen are used in particular.
Durch den Einsatz dieser Gase wird intensiv Einfluß auf die Oberfläche des Stahlstranges genommen, und zwar sowohl im flüssigen Bereich, wie im erstarrten Bereich, als auch im Übergangsbereich flüssig/fest. Zum einen wird hierdurch jegliche Verzunderung vermieden. Darüber hinaus wird durch den Einsatz des Gases in Düsennähe gezielt die Wärmeabfuhr und die Oberflächenspannung beeinflußt. In Abhängigkeit der gewünschten Qualität des Stahlstranges bzw. des Stahlbandes schlagen die Erfinder vor, das Gas entweder zu erhitzen und hierdurch ein Erstarren der Strangoberfläche für eine vorgebbare Strecke zu verhindern, oder in einer anderen Ausführungsform, das 6as soweit abzukühlen, daQ es in flüssiger Form gefördert wird. In beiden extremen Bereichen kann die Temperatur des Gases vorggebar geführt werden. Selbstverständlich kann das Gas auch bei Raumtemperatur eingesetzt werden. Neben der Temperatur wird in einer vorteilhaften Weiterbildung der Erfindung vorgeschlagen, das Gas einer Menge und einer Geschwindigkeit in der Weise auf die Oberfläche des Stahlstranges zu leiten, daß Einfluß auf die Form des Gieβstranges genommen wird. Zum einen kann die Oberfläche gezielt eingedrückt werden und dem Gesamtstrang beispielsweise das Profil in Form einer Bombierung gegeben werden. Das Gas kann aber auch so gesteuert werden, daß die Gaskinetik ergänzend einen positiven Einfluß bei der Verminderung einer Beulenbildung nimmt.By using these gases, there is an intense influence on the surface of the steel strand, both in the liquid area, such as in the solidified area, and in the liquid / solid transition area. On the one hand, this prevents any scaling. In addition, the use of the gas in the vicinity of the nozzle specifically influences the heat dissipation and the surface tension. Depending on the desired quality of the steel strand or steel strip, the inventors propose either to heat the gas and thereby prevent the strand surface from solidifying for a predeterminable distance, or in another embodiment to cool the 6as to such an extent that it is in liquid form is promoted. The temperature of the gas can be pre-set in both extreme areas. Of course, the gas can also be used at room temperature. In addition to the temperature, it is proposed in an advantageous development of the invention to guide the gas in a quantity and at a speed to the surface of the steel strand in such a way that the shape of the casting strand is influenced. On the one hand, the surface can be deliberately pressed in and, for example, the profile can be given a crown in the form of a crown. However, the gas can also be controlled in such a way that the gas kinetics additionally have a positive influence in reducing the formation of bumps.
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 schematisch einen Längsschnitt durch die Gießanlage Figur 2 schematisch einen Querschnitt.Figure 1 schematically shows a longitudinal section through the casting machine Figure 2 schematically shows a cross section.
Die Figur 1 zeigt ein metallurgisches GefäQ 11, bei dem aus einer Metalldüse 12 eine Metallschmelze M ausströmt.FIG. 1 shows a metallurgical vessel 11, in which a metal melt M flows out of a metal nozzle 12.
Die Schmelze M wird auf ein Transportband 43 geführt, welches als Endlosband von einer Antriebstrommel 41 und einer Umlenktrommel 42 gehalten wird. Auf der Unterseite des Obεrtrumms des Transportbandes 43 ist eine Kühleinrichtung 44 vorgesehen, die den Stahlstrang S, der in Förderrichtung s transportiert wird, kühlt.The melt M is fed onto a conveyor belt 43, which is held as an endless belt by a drive drum 41 and a deflection drum 42. A cooling device 44 is provided on the underside of the upper run of the conveyor belt 43, which cools the steel strand S, which is transported in the conveying direction s.
Der Metallstrang 5 ist von einer Einhausung 31 umgeben, von der er am Austritt 32 durch eine Dichtung 33 zur Minimierung der Gaslekage umgeben ist.The metal strand 5 is surrounded by a housing 31, of which it is surrounded at the outlet 32 by a seal 33 to minimize the gas leakage.
Durch die Decke der Einhausung 31 sind Gasdüsen 25 durchgeführt. Diese Düsen 25 weisen gegenüber dem Stahlstrang S einen Winkel zwischen 0 und 45 ° auf. Diese Gasdüsen 25 sind an Gasverteiler 26 angeschlossen, die über Zuleitungen 23 mit einem Verdichter 21 in Verbindung stehen. Die Gasdüsen 25 sind durch Absperrorgane 24 einzeln absperrbar.Gas nozzles 25 are passed through the ceiling of the housing 31. These nozzles 25 have an angle between 0 and 45 ° with respect to the steel strand S. These gas nozzles 25 are connected to gas distributors 26 which are connected to a compressor 21 via feed lines 23. The gas nozzles 25 can be shut off individually by shut-off elements 24.
Zwischen dem Verdichter 21 und den Düsen 25 ist ein Wärmetauscher 22 angeordnet, mit dem die Temperatur des eine reduzierte Atmosphäre bildenden Gases bzw. des Inertgases vorgebbar einstellbar ist. Der Verdichter 21 ist an eine Gasversorgungsstation 29 angeschlossen. In der Figur 1 ist eine Verbindungsleitung 28 vorgesehen, die die Gasversorgungsstation 29 über eine Gassammelleitung 27 mit der Einhausung 31 im Bereich des Strangaustrittes 32 verbindet.A heat exchanger 22 is arranged between the compressor 21 and the nozzles 25, with which the temperature of the gas forming a reduced atmosphere or of the inert gas can be predetermined. The compressor 21 is connected to a gas supply station 29. In FIG. 1, a connecting line 28 is provided, which connects the gas supply station 29 to the housing 31 in the region of the strand outlet 32 via a gas manifold 27.
Die Figur 2 zeigt unter Verwendung identischer Positionsziffern wie Figur 1 einen Querschnitt durch eine Bandgieβanlage. Dargestellt ist die Anordnung mehrerer Gasdüsen 25 nebeneinander, die jeweils ein Absperrorgan 24 aufweisen und an einen Verteiler 26 angeschlossen sind, der die Zuleitung 23 aufweist.FIG. 2 shows a cross section through a strip casting machine using the same position numbers as FIG. 1. The arrangement of several gas nozzles 25 next to one another is shown, each of which has a shut-off element 24 and is connected to a distributor 26 which has the feed line 23.
Im oberen Bereich der Umlenktrommel 42 ist eine Dichtung 34 vorgesehen, die die Lekagen zwischen den Seitenwangen der Einhausung 31 und den Seitenschildern der Trommel 42 minimiert. A seal 34 is provided in the upper area of the deflection drum 42, which minimizes the leakage between the side cheeks of the housing 31 and the side plates of the drum 42.
Positionsliste:Position list:
10 Metallzuführung10 metal feeder
11 metallurgisches Gefäß11 metallurgical vessel
12 Metalldüse12 metal nozzle
20 Gaszuführung20 gas supply
21 Verdichter21 compressors
22 Wärmetauscher22 heat exchangers
23 Zuleitung23 supply line
24 Absperrorgan24 shut-off device
25 Gasdüse25 gas nozzle
26 Verteiler26 distributors
27 Gassammelleitung27 gas manifold
28 Verbindungsleitung28 connecting line
23 Gasversorgungsstation23 gas supply station
30 Gasatmosphäre30 gas atmosphere
31 Einhausung31 housing
32 Austritt Strang32 Exit strand
33 Dichtung.(32)33 seal. (32)
34 Dichtung (42)34 gasket (42)
40 Gießmaschine40 casting machine
41 Antriebstrommel41 drive drum
42 Umlenktrommel42 deflection drum
43 Transportband43 conveyor belt
44 Kühleinrichtung 5 Metallstrang s Förderrichtung44 Cooling device 5 metal strand s conveying direction
M SchmelzeM melt
ERSATZBLATT REPLACEMENT LEAF

Claims

Patentansprüche: Claims:
1. Verfahren zum Kühlen schmelzflüssigen Stahls, insbesondere durch Bandgießen, bei dem mindestens ein Teil des aus einer Metalldüse eines metallurgischen Gefäßes austretenden Schmelze durch Kontakt mit einer Kühlfläche erstarrt, dadurch gekennzeichnet, daQ ein eine reduzierende Atmosphäre bildender Gasstrom, insbesondere ein Inertgasstrom, auf die Oberfläche des frei zugänglichen flüssigen Stahlstranges unmittelbar nach seinem Verlassen der Metalldüse des metallurgischen Gefäßes geleitet, und daQ die Strangoberfläche mindestens bis zum vollständigen Durcherstarren dieser Gasatmosphäre ausgesetzt wird.1. A method for cooling molten steel, in particular by strip casting, in which at least part of the melt emerging from a metal nozzle of a metallurgical vessel solidifies by contact with a cooling surface, characterized in that a gas stream forming a reducing atmosphere, in particular an inert gas stream, is applied to the Surface of the freely accessible liquid steel strand passed immediately after leaving the metal nozzle of the metallurgical vessel, and that the strand surface is exposed to this gas atmosphere at least until it has completely solidified.
2. verfahren nach Anspruch 1, dadurch gekennzeichnet, daQ die .Temperatur des Gases vorgebbar geführt wird.2. The method according to claim 1, characterized in that the temperature of the gas is predetermined.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daQ das Gas auf eine Temperatur erhitzt wird, die ein Erstarren der Strangoberfläche verhindert.3. The method according to claim 2, characterized in that the gas is heated to a temperature which prevents the strand surface from solidifying.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daQ das HeiQgas in Strangförderrichtung in einem Bereich auf die Strangoberfläche aufgetragen wird, in dem die auf der Gegenseite einsetzende Erstarrungsfront den Strang in Dickenrichtung noch nicht durchdrungen hat.4. The method according to claim 3, characterized in that the hot gas is applied in the strand conveying direction to the strand surface in a region in which the solidification front which has started on the opposite side has not yet penetrated the strand in the thickness direction.
ERSATZBLATT 5. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß das Gas soweit abgekühlt wird, daß es in flüssiger Form gefördert wird.REPLACEMENT LEAF 5. The method according to claim 2, characterized in that the gas is cooled to the extent that it is conveyed in liquid form.
6. Verfahren nach einem der obengenannten Ansprüche, dadurch gekennzeichnet, daQ das Gas in einem Winkel zwischen 0 und 50° auf die Oberfläche des Stahlstranges auftrifft.6. The method according to any one of the above claims, characterized in that the gas strikes the surface of the steel strand at an angle between 0 and 50 °.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daQ das Gas zur Verminderung der Oberflächenspannung des Stahlstranges auf diesen isokinεtisch und unter einem Winkel <10D aufgebracht wird.7. The method according to claim 6, characterized in that the gas for reducing the surface tension of the steel strand is applied isokinεtisch and at an angle <10 D.
Verfahren nach Anspruch 6, dadurch gekennzeichnet, daQ das Gas in so großer Menge und so hoher Geschwindigkeit auf der Oberfläche des Stahlstranges auftrifft, daQ der Strang im Querschnitt sich verringernd an der Oberfläche eingedrückt wird.A method according to claim 6, characterized in that the gas hits the surface of the steel strand in such a large amount and at such a high speed that the cross-section of the strand is pressed into the surface with a decreasing cross section.
Verfahren nach Anspruch 8, dadurch gekennzeichnet, daQ der Gasstrom so gesteuert wird, daQ in Richtung quer zurA method according to claim 8, characterized in that the gas flow is controlled so that in the direction transverse to
Förderrichtung des Stahlstranges ein Geschwindigkeits- undDirection of conveyance of the steel strand a speed and
Druckprofil eingestellt wird.Pressure profile is set.
ERSATZBLATT 10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß das Geschwindigkeits- und Druckprofil die Form einer Bombierung aufweist.REPLACEMENT LEAF 10. The method according to claim 9, characterized in that the speed and pressure profile has the shape of a crown.
11. Vorrichtung zum StranggieBen von Stahl mit einem, eine Metalldüse aufweisenden Gefäß, über die Schmelze einer mindestens eine Seite des Stahlstranges, insbesondere von Metallbändern, berührende Kühlform führbar ist, zur Durchführung des Verfahrens nach Anspruch11. Device for the continuous casting of steel with a vessel having a metal nozzle, over which the melt of a cooling mold touching at least one side of the steel strand, in particular of metal strips, can be guided, for carrying out the method according to claim
1. dadurch gekennzeichnet, daQ eine Einhausung (31) vorgesehen ist, die den Stahlstrang (S) in dem Bereich bis zu seiner vollständigen Durcherstarrung umhüllt, daQ innerhalb der Einhausung in Strangführungsrichtung (s) parallel zur Metalldüse (12) des Gefäßes (11) mindestens in ihrer unmittelbaren Nähe Gasdüsen (25) angeordnet sind, die an eine1. characterized in that an enclosure (31) is provided which surrounds the steel strand (S) in the region until it has completely solidified, since inside the enclosure in the strand guide direction (s) parallel to the metal nozzle (12) of the vessel (11) at least in their immediate vicinity gas nozzles (25) are arranged, which are connected to a
Gasversorgungsstation (29) angeschlossen sind, und daQ die Einhausung (31) im wesentlichen an derGas supply station (29) are connected, and that the housing (31) essentially at the
Strangaustrittsöffnung (32) eine Abdichtung (33) aufweist, die dieStrand exit opening (32) has a seal (33) which
Gaslekagen minimiert.Gas leakage minimized.
12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daQ in Abhängigkeit des gewünschten Gasvolumens und/oder der Gasaustrittsgeschwindigkeit auf den Stahlstrang die Anzahl und die Anordnung der Gasdüsen (25) in Strangförderrichtung (s) sowie in Strangbreitenrichtung festgelegt sind.12. The apparatus according to claim 11, characterized in that the number and the arrangement of the gas nozzles (25) in the strand conveying direction (s) and in the strand width direction are determined as a function of the desired gas volume and / or the gas outlet velocity.
13. Vorrichtung nach Anspruch 12. dadurch gekennzeichnet, daß zwischen der Gasversorgungsstation (29)13. The apparatus according to claim 12, characterized in that between the gas supply station (29)
ERSATZBLATT und den Gasdüsen (25) ein Wärmetauscher vorgesehen ist.REPLACEMENT LEAF and a heat exchanger is provided for the gas nozzles (25).
14. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daQ an die Versorgungsstation ein Verdichter (21) angeschlossen ist.14. The apparatus according to claim 11, characterized in that a compressor (21) is connected to the supply station.
15. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daQ an der Einhausung (31) am Strangaustrittsende (32) eine Gassammelleitung (27) vorgesehen ist, die mit der Gasversorgungsstation (29) des Gases in Verbindung steht. 15. The apparatus according to claim 11, characterized in that a gas manifold (27) is provided on the housing (31) at the end of the strand outlet (32), which is connected to the gas supply station (29) of the gas.
EP95910398A 1994-03-04 1995-02-10 Process and device for cooling molten steel Expired - Lifetime EP0746434B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4407873 1994-03-04
DE4407873A DE4407873C2 (en) 1994-03-04 1994-03-04 Method and device for cooling molten steel
PCT/DE1995/000196 WO1995023661A1 (en) 1994-03-04 1995-02-10 Process and device for cooling molten steel

Publications (2)

Publication Number Publication Date
EP0746434A1 true EP0746434A1 (en) 1996-12-11
EP0746434B1 EP0746434B1 (en) 1998-12-30

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EP95910398A Expired - Lifetime EP0746434B1 (en) 1994-03-04 1995-02-10 Process and device for cooling molten steel

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US (1) US5836377A (en)
EP (1) EP0746434B1 (en)
JP (1) JP3016594B2 (en)
KR (1) KR100295950B1 (en)
CN (1) CN1046447C (en)
AT (1) ATE175136T1 (en)
AU (1) AU679342B2 (en)
BR (1) BR9506980A (en)
CA (1) CA2184719C (en)
DE (1) DE4407873C2 (en)
RU (1) RU2122919C1 (en)
WO (1) WO1995023661A1 (en)
ZA (1) ZA951664B (en)

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DE4407873C2 (en) 1997-04-10
CA2184719C (en) 2005-05-10
DE4407873A1 (en) 1995-09-07
AU1753595A (en) 1995-09-18
KR100295950B1 (en) 2001-10-24
US5836377A (en) 1998-11-17
CN1046447C (en) 1999-11-17
ATE175136T1 (en) 1999-01-15
CA2184719A1 (en) 1995-09-08
EP0746434B1 (en) 1998-12-30
AU679342B2 (en) 1997-06-26
RU2122919C1 (en) 1998-12-10
WO1995023661A1 (en) 1995-09-08
JPH09511451A (en) 1997-11-18
ZA951664B (en) 1996-02-09
CN1143340A (en) 1997-02-19
BR9506980A (en) 1997-09-16
JP3016594B2 (en) 2000-03-06

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