EP1330322B1 - Vorrichtung und verfahren zum stranggiessen von flüssigem stahl - Google Patents

Vorrichtung und verfahren zum stranggiessen von flüssigem stahl Download PDF

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Publication number
EP1330322B1
EP1330322B1 EP01971525A EP01971525A EP1330322B1 EP 1330322 B1 EP1330322 B1 EP 1330322B1 EP 01971525 A EP01971525 A EP 01971525A EP 01971525 A EP01971525 A EP 01971525A EP 1330322 B1 EP1330322 B1 EP 1330322B1
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EP
European Patent Office
Prior art keywords
dome
steel
nozzle
zone
liquid
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Expired - Lifetime
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EP01971525A
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English (en)
French (fr)
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EP1330322A1 (de
Inventor
Paul Naveau
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/112—Treating the molten metal by accelerated cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • the present invention relates to a new device for casting steel continuously, to obtain a final product of mixed chemical composition, namely comprising on the one hand the base steel, and on the other hand, base steel combined with elements added during casting.
  • the invention also relates to the method implemented by the device.
  • the technique of continuous casting of steel is well known. It consists essentially to feed with molten steel from a tundish or tundish basket, a cooled mold of copper or copper alloy, called continuous casting mold, this last being open at its lower end, and to extract from this opening a continuous ingot partially solidified.
  • the molten steel is introduced into the mold by means of at least one nozzle, that is to say a generally tubular element disposed between the basket distributor and the mold.
  • the lower end of the nozzle- is provided usually one or two outlets located in the axis of the nozzle or laterally, and opens under the upper level of liquid steel present in the mold.
  • nozzles for obtaining better cooling of the superheated liquid steel from the tundish.
  • the goal is to get pasty steel at the inlet of the mold.
  • These nozzles may in particular have a heat exchanger consisting of a copper tube cooled with water or a deflector or dome. Its role is to force overheated steel to trickle into a thin layer along the walls of the nozzle, which significantly increases the heat exchange surface. This technique is called hollow jet casting.
  • an injection of inert gas is often performed at the level of the entry of the molten steel into the nozzle in order to prevent oxidation of the steel and prevent accidental clogging, particularly by alumina formation.
  • the technique of casting in a hollow jet makes it possible in particular to reduce the risk of clogging of the gas supply, in relation to the case where the inlet port thereof is directly in contact with the liquid steel introduced into the nozzle.
  • injecting the inert gas, such as argon for example into the hollow jet.
  • This material is by example an alloy metal or a ceramic. The purpose is to obtain, as the case may be, a metal alloy or composite.
  • the two-component term means products whose chemical composition of steel is different depending on the location of the investigated product, eg different skin by report to the heart.
  • the present invention aims at providing a device and an associated method of casting steel for the production of products with a mixed chemical not having the disadvantages of the state of the art.
  • the invention proposes a new method allowing the use of a existing continuous casting installation, with only one specific nozzle.
  • the present invention relates to a continuous casting nozzle intended for the flow of steel from a tundish into an ingot mold; said nozzle mainly comprising, if described in a vertical position and considered in the direction of progression of the steel wound up and down, a vertical pipe, terminated by an upper base having an inlet for liquid steel from the basket splitter and a lower base having at least one exit port; said conduit comprising in its upper part a distribution member disposed substantially at the inlet of said vertical duct and comprising a dome for deflecting the metal entering the nozzle; said nozzle also comprising injection means of gaseous, liquid or solid material finely divided under said dome in a zone internal: characterized in that the dome of said distributor is provided with means allowing the separation of the liquid steel in two jets, which penetrate separately in the mold.
  • the dome of said distributor member has at least four passages that are interconnected so as to split the flow of steel into merging into two separate jets, flowing respectively via a so-called internal zone and a said outer zone to the mold.
  • the outer zone opens to the mold by means of at least two lateral openings and the inner zone opens to the mold by means of at least one first orifice.
  • the liquid metal passing under the dome in the area where gas, liquid or solid material is injected finely divided is channeled into the inner zone and flows into the mold via the or the first orifices.
  • the liquid metal passing under the dome in the area where gas, liquid or solid material is injected finely divided is channeled into the outer zone and flows into the mold via the lateral openings.
  • a preferred embodiment of the invention relates to a nozzle for to the flow of steel from a tundish in an ingot mold.
  • the nozzle mainly includes, if described in a vertical position and considered in the direction of progression of the liquid steel from top to bottom, a vertical pipe, terminated by an upper base having an inlet for liquid steel from the basket splitter and a lower base having a first output port.
  • duct has in its upper part a distribution member, arranged substantially at the entrance of said vertical duct and comprising a dome allowing deflect the metal entering the nozzle, as well as a vertical wall ending the dome downwardly and extending to the lower base of said conduit, said vertical wall having at least two lateral outlets, the distribution member dividing the vertical conduit in two physically separated zones, a so-called internal zone and a so-called external zone.
  • the nozzle also comprises material injection means gaseous, liquid or solid finely divided under said dome in the so-called internal zone.
  • the nozzle is characterized in that the dome of said distributor member is provided with means for separating the liquid steel in two streams, a jet flowing in the so-called internal zone and penetrating into the ingot mold by said first orifice and a jet flowing in the so-called external zone and penetrating into the ingot mold through the orifices side.
  • the vertical duct is of cylindrical shape, circular section or oval.
  • the liquid metal constituting the jet in which is operated a Injection under the dome consists of a mixture of base steel and injected material under the dome.
  • the chemical composition of the metal obtained after an injection under the dome is different from the chemical composition of the base steel.
  • the finely divided solid material injected under the dome is in suspension in a non-oxidizing gas.
  • the finely divided solid material injected under the dome presents a particle size less than 2000 ⁇ m.
  • the particle size of said finely divided is between 100 and 300 ⁇ m.
  • the two jets are of different rates.
  • the flow of liquid metal poured for the products dishes is between 1.5 and 6 tons per minute.
  • the flow is between 0.3 and 0.5 ton per minute.
  • the vertical duct is provided with means for regulating the temperature of the liquid metal flowing via said duct.
  • the means for regulating the temperature of the liquid metal flowing in the part situated before the distribution element comprising the dome are distinct from the means regulating the temperature of the liquid metal flowing in the part situated after the said dome.
  • the nozzle of the invention is part of a continuous casting installation of steel, preferably in the form of long or flat products, comprising a basket distributor with an outlet and a flow control device, and a mold.
  • the nozzle then allows the casting of a steel of mixed composition in the mold from the molten base steel of the tundish.
  • FIG. 1 shows a casting device according to a particular embodiment of the invention, mounted between a continuous casting mold 1 and a ladle or a basket casting distributor 2 having an outlet duct 3.
  • the outlet duct 3 is equipped with a flow regulator, such as a stopper 4 or a sliding drawer nozzle 5, having essentially the shape of a cylinder, possibly of section oval, attached to the tundish, is mounted on the mold 1.
  • the nozzle 5 can be for example provided with a copper heat exchanger, provided with a water cooling.
  • the upper base of the cylinder is in contact with the conduit 3. This base is provided with an orifice corresponding to the lower orifice of the duct.
  • the nozzle 5 comprises at its bottom three communication ports allowing the passing from the steel to the mold: two side openings 8 and a hearing 9 located in the lower base of the duct 5.
  • a dome-shaped distributor member 6 At the upper end of the nozzle 5 is arranged a dome-shaped distributor member 6 whose upper surface is slightly sloped; preferably greater than 10 ° with respect to the horizontal.
  • the dome 6 is fixed by means not shown in the conduit 5.
  • An injection device 7 is located so as to introduce under the dome 6, a gas, a liquid or solid particles finely divided or powdered, possibly using in the latter case a non oxidant as a vector.
  • the dome 6 has a side wall 10, preferably vertical and cylindrical, extending to the bottom of the nozzle 5. This side wall allows to isolate a so-called inner portion 11 of the conduit 5 of another so-called external 12 of the same conduit 5.
  • FIG. 2 schematically shows in plan a mode of realization.
  • a distribution dome 6 comprising four passages for the molten metal, communicating two by two.
  • the four passages are each associated with a opening in the dome 6.
  • Two openings 13 are delimited by cutting the dome between the latter and the inner wall of the nozzle 5.
  • the two other openings 14 are for example practiced more centrally on the surface of the dome 6, and communicate under this surface by a common collection pipe 11, itself opening towards downstream of the nozzle.
  • the dome 6 makes it possible to separate the jet of metal A coming from tundish 2 through the duct 3 in two separate jets, of importance substantially equal, physically separated from each other: a first jet of metal B flowing in the center 11 of the nozzle 5 and a second jet of metal C flowing in the space 12, possibly along the inner side wall of the duct 5 ( Figure 1).
  • the injection device 7 makes it possible to introduce into the metal jet B a constituent addition, such as alloy metal, gas or ceramic, and to modify the composition relative to the base metal.
  • the metal B flows from the nozzle 5 into the central portion of the mold 1, by the hearing 9.
  • the metal C flows from the nozzle 5 by 8. By solidifying, the metal C will be distributed on the walls of the mold while the metal B, of modified chemical composition, is rather at heart in the solidified mass.
  • the material injected by the device 7 under the dome 6 may be in the gas phase, liquid or solid. In the latter case, the material is in powder form or finely divided particles. The size of the particles injected is less than 2 mm, and most often between 100 and 300 microns.
  • the process according to the invention can be used both in the continuous casting of flat products, such as slabs, than in long products, such as round, squares, threads, etc.
  • the variation of chemical composition obtained on the section of the product can be preserved during direct rolling.
  • Such steels are therefore perfectly suitable for galvanizing, for example in that the outer layer is of modified composition relative to the core of the product and promotes easy attachment of the zinc coating layer, in particular by reducing in skin of silicon concentration.
  • the steel may contain copper (CORTEN steel) continuously in order to avoid problems of surface corrosion. We can avoid the use of stainless steel, which is very expensive.
  • the flow rates of steel in the mold meet the standard industrial standards in the iron and steel industry. In particular, for flat products, the flow rate is between 1.5 and 6 tons / min and for long products between 0.3 and 0.5 tons / min.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)

Claims (19)

  1. Stranggießrohr (5) für den Stahlabguss (A) aus einem Verteilerkorb (2) in eine Kokille (1); das besagte Gießrohr umfasst im Wesentlichen, wenn es in vertikaler Position beschrieben wird und in Flussrichtung des flüssigen Stahls von oben nach unten betrachtet wird, ein vertikales Leitungsrohr (5), das an seinem oberen Ende eine Eintrittsöffnung für den flüssigen Stahl (A) aus dem Verteilerkorb (2) und an seinem unteren Ende eine Austrittsöffnung umfasst; das besagte Leitungsrohr (5) umfasst in seinem oberen Teil eine Verteilervorrichtung, die sich am Eintritt des besagten Leitungsrohrs (5) befindet und eine Kuppe (6) umfasst, die es ermöglicht, das in das Gießrohr eintretende Metall (A) umzuleiten; das besagte Gießrohr umfasst ebenfalls Mittel zur Einspritzung von zerstäubten Gasen, Flüssigkeiten oder Feststoffen unter die besagte Kuppel (6) in einen inneren Bereich (11); dadurch gekennzeichnet, dass die Kuppe (6) der Verteilervorrichtung mit Mitteln versehen ist, die die Trennung des flüssigen Stahls in zwei Strahlen (B, C), die getrennt in die Kokille (1) eindringen, ermöglichen.
  2. Gießrohr gemäß Anspruch 1, dadurch gekennzeichnet, dass die Kuppe (6) der besagten Verteilervorrichtung mindestens vier Durchlässe aufweist und dadurch, dass die besagten Durchlässe so miteinander verbunden sind, dass der Abguss des geschmolzenen Stahls (A) in zwei getrennte Strahlen (B, C) geteilt wird, die jeweils durch einen sogenannten inneren Bereich (11) und einen sogenannten äußeren Bereich (12) in die Kokille abfließen.
  3. Gießrohr gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass der äußere Bereich (12) durch mindestens 2 seitliche Öffnungen (8) in die Kokille mündet und dadurch, dass der innere Bereich (11) durch mindestens eine Öffnung (9) in die Kokille mündet.
  4. Gießrohr gemäß Anspruch 2 oder 3, dadurch gekennzeichnet, dass das flüssige Metall, das unter der Kuppe in dem Bereich, in dem zerstäubte Gase, Flüssigkeiten oder Feststoffe eingespritzt werden, durchfließt, in dem inneren Bereich (11) kanalisiert wird und durch die Öffnung(en) (9) in die Kokille (1) abfließt.
  5. Gießrohr gemäß Anspruch 2 oder 3, dadurch gekennzeichnet, dass das flüssige Metall, das unter der Kuppe in dem Bereich, in dem zerstäubte Gase, Flüssigkeiten oder Feststoffe eingespritzt werden, durchfließt, in dem äußeren Bereich (12) kanalisiert wird und durch die Öffnungen (8) in die Kokille (1) abfließt.
  6. Gießrohr gemäß einem der Ansprüche 1 bis 5, für den Stahlabguss (A) aus einem Verteilerkorb (2) in eine Kokille (1); das besagte Gießrohr umfasst im Wesentlichen, wenn es in vertikaler Position beschrieben wird und in Flussrichtung des flüssigen Stahls von oben nach unten betrachtet wird, ein vertikales Leitungsrohr (5), das an seinem oberen Ende eine Eintrittsöffnung für den flüssigen Stahl (A) aus dem Verteilerkorb (2) und an seinem unteren Ende eine erste Austrittsöffnung (9) umfasst; das besagte Leitungsrohr (5) umfasst in seinem oberen Teil eine Verteilervorrichtung, die sich am Eintritt des besagten Leitungsrohrs (5) befindet und eine Kuppe (6) umfasst, die es ermöglicht, das in das Gießrohr eintretende Metall (A) umzuleiten, sowie eine vertikale Wand (10), die die Kuppel (6) nach unten abschließt und sich bis zu dem unteren Ende des besagten Leitungsrohrs (5) erstreckt; die besagte vertikale Wand (5) umfasst mindestens zwei seitliche Austrittsöffnungen (8), die Verteilervorrichtung teilt das vertikale Leitungsrohr (5) in zwei getrennte Bereiche, einen sogenannten inneren Bereich (11) und einen sogenannten äußeren Bereich (12); das besagte Gießrohr umfasst ebenfalls Mittel zur Einspritzung von zerstäubten Gasen, Flüssigkeiten oder Feststoffen unter die besagte Kuppel (6) in den inneren Bereich (11); dadurch gekennzeichnet, dass die Kuppe (6) der Verteilervorrichtung mit Mitteln versehen ist, die die Trennung des flüssigen Stahls in zwei Strahlen (B, C) ermöglicht, einen Strahl (B), der in den sogenannten inneren Bereich (11) fließt und durch die besagte erste Öffnung (9) in die Kokille (1) eindringt, und einen Strahl, der in den sogenannten äußeren Bereich (12) fließt und durch die seitlichen Öffnungen (8) in die Kokille (1) eindringt.
  7. Gießrohr gemäß einem der oben genannten Ansprüche, dadurch gekennzeichnet, dass das vertikale Leitungsrohr (5) zylinderförmig ist und einen runden oder ovalen Querschnitt aufweist.
  8. Gießrohr gemäß einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das flüssige Metall, das den Strahl bildet, in den die Einspritzung unter der Kuppel (6) erfolgt, aus einer Mischung aus Grundstahl und dem Material besteht, das unter der Kuppel (6) eingespritzt wird.
  9. Gießrohr gemäß einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass sich die chemische Zusammensetzung des Metalls, das nach einer Einspritzung unter der Kuppel (6) entsteht, von der chemischen Zusammensetzung des Grundstahls (A) unterscheidet.
  10. Gießrohr gemäß einem der oben genannten Ansprüche, dadurch gekennzeichnet, dass der besagte zerstäubte Feststoff, der unter der Kuppel (6) eingespritzt wurde, in nicht oxidierendem Gas suspendiert ist.
  11. Gießrohr gemäß einem der oben genannten Ansprüche, dadurch gekennzeichnet, dass der besagte zerstäubte Feststoff, der unter der Kuppel (6) eingespritzt wurde, eine Kornverteilung von weniger als 2000 µm aufweist.
  12. Gießrohr gemäß Anspruch 11, dadurch gekennzeichnet, dass die Kornverteilung des besagten zerstäubten Stoffes zwischen 100 und 300 µm liegt.
  13. Gießrohr gemäß einem der oben genannten Ansprüche, dadurch gekennzeichnet, dass die beiden Strahlen (B, C) unterschiedliche Ausflussmengen aufweisen.
  14. Gießrohr gemäß einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die Ausflussmenge des gegossenen flüssigen Metalls für die flachen Produkte zwischen 1,5 und 6 Tonnen pro Minute beträgt.
  15. Gießrohr gemäß einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die Ausflussmenge des gegossenen flüssigen Metalls für die langen Produkte zwischen 0,3 und 0,5 Tonnen pro Minute beträgt.
  16. Gießrohr gemäß einem der oben genannten Ansprüche, dadurch gekennzeichnet, dass das vertikale Leitungsrohr (5) mit Mitteln zur Temperaturregelung des flüssigen Metalls (A), das durch das Leitungsrohr fließt, versehen ist.
  17. Gießrohr gemäß Anspruch 16, dadurch gekennzeichnet, dass die Mittel zur Temperaturregelung des flüssigen Metalls, das durch den Bereich vor dem mit der Kuppel (6) ausgestatteten Verteilerelement fließt, sich von den Mitteln zur Temperaturregelung des flüssigen Metalls, das durch den Bereich hinter der besagten Kuppel (6)fließt, unterscheiden.
  18. Einrichtung für das Stranggießen von Stahl, vorzugsweise in Form von langen oder flachen Produkten, die einen Verteilerkorb mit einer Austrittsöffnung und einer Regelvorrichtung der Ausflussmenge, einer Kokille und einem Gießrohr gemäß einem der Ansprüche 1 bis 17 umfasst, das besagte Gießrohr ermöglicht das Gießen eines Stahls aus gemischter Zusammensetzung in die Kokille, ausgehend von dem geschmolzenen Grundstahl im Verteilerkorb.
  19. Verfahren für das Stranggießen von Stahl, vorzugsweise in Form von flachen oder langen Produkten, das folgende Schritte umfasst:
    Gießen eines geschmolzenen Grundstahls aus einem Verteilerkorb durch eine Austrittsöffnung, die über eine Vorrichtung zur Regelung der Ausflussmenge verfügt, in ein Gießrohr, das eine Verteilervorrichtung mit einer Kuppel und einer vertikalen Wand umfasst, die das Gießrohr in einen inneren und einen äußeren Bereich teilt;
    Trennung des Grundstahls in der Verteilervorrichtung in einen inneren und einen äußeren Strahl;
    Einspritzen von zerstäubten Gasen, Flüssigkeiten oder Feststoffen unter der Kuppel in den inneren Bereich und Mischung des besagten Stoffes mit dem Grundstahl, um einen Stahl zu bilden, dessen chemische Zusammensetzung sich von der des Grundstahls unterscheidet;
    Abfließen des Strahls aus Grundstahl durch seitliche Öffnungen des Gießrohrs und Abkühlen des besagten Strahls entlang der Wände der Kokille;
    Abfließen des Strahls aus Stahl mit unterschiedlicher chemischer Zusammensetzung durch eine untere Öffnung des Gießrohrs und Abkühlen des besagten Strahls im Inneren der Kokille.
EP01971525A 2000-10-10 2001-09-18 Vorrichtung und verfahren zum stranggiessen von flüssigem stahl Expired - Lifetime EP1330322B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE200000643 2000-10-10
BE2000/0643A BE1013745A3 (fr) 2000-10-10 2000-10-10 Procede et dispositif pour couler en continu de l'acier a composition chimique mixte.
PCT/BE2001/000158 WO2002030598A1 (fr) 2000-10-10 2001-09-18 Procede et dispositif pour couler en continu de l'acier liquide

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Publication Number Publication Date
EP1330322A1 EP1330322A1 (de) 2003-07-30
EP1330322B1 true EP1330322B1 (de) 2005-11-30

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US (1) US6913170B2 (de)
EP (1) EP1330322B1 (de)
JP (1) JP4562347B2 (de)
KR (1) KR100842026B1 (de)
AT (1) ATE311267T1 (de)
BE (1) BE1013745A3 (de)
CA (1) CA2424085C (de)
DE (1) DE60115489T2 (de)
ES (1) ES2253420T3 (de)
WO (1) WO2002030598A1 (de)

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US9004150B2 (en) 2005-03-16 2015-04-14 Centre de Recherches Metallurgiques ASBL—Centrum Voor Research in de Metallurgie VZW Method for continuous casting of a metal with improved mechanical strength and product obtained by said method
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MX349696B (es) * 2012-03-28 2017-08-09 Arcelormittal Investigacion Y Desarrollo Sl Equipo de colada continua.
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Publication number Priority date Publication date Assignee Title
US11744744B2 (en) 2019-09-05 2023-09-05 Curt G. Joa, Inc. Curved elastic with entrapment

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Publication number Publication date
ATE311267T1 (de) 2005-12-15
US20030173721A1 (en) 2003-09-18
EP1330322A1 (de) 2003-07-30
BE1013745A3 (fr) 2002-07-02
KR20030037684A (ko) 2003-05-14
DE60115489D1 (de) 2006-01-05
JP4562347B2 (ja) 2010-10-13
CA2424085A1 (en) 2002-04-18
ES2253420T3 (es) 2006-06-01
US6913170B2 (en) 2005-07-05
JP2004509771A (ja) 2004-04-02
CA2424085C (en) 2009-12-15
WO2002030598A1 (fr) 2002-04-18
KR100842026B1 (ko) 2008-06-27
DE60115489T2 (de) 2006-07-20

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