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EP2099576B1 - Hollow jet nozzle for continuous steel casting - Google Patents

Hollow jet nozzle for continuous steel casting Download PDF

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Publication number
EP2099576B1
EP2099576B1 EP07800357A EP07800357A EP2099576B1 EP 2099576 B1 EP2099576 B1 EP 2099576B1 EP 07800357 A EP07800357 A EP 07800357A EP 07800357 A EP07800357 A EP 07800357A EP 2099576 B1 EP2099576 B1 EP 2099576B1
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EP
European Patent Office
Prior art keywords
nozzle
powder
pipe
installation according
injecting
Prior art date
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Active
Application number
EP07800357A
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German (de)
French (fr)
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EP2099576B8 (en
EP2099576A1 (en
Inventor
Paul Naveau
Jean-Michel Damasse
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.)
Centre De Recherches Metallurgiques Asbl - Centrum
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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Priority to PL07800357T priority Critical patent/PL2099576T3/en
Priority to SI200730287T priority patent/SI2099576T1/en
Publication of EP2099576A1 publication Critical patent/EP2099576A1/en
Application granted granted Critical
Publication of EP2099576B1 publication Critical patent/EP2099576B1/en
Publication of EP2099576B8 publication Critical patent/EP2099576B8/en
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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
    • 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
    • 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
    • B22D11/108—Feeding additives, powders, or the like
    • 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

Definitions

  • the present invention relates to an improvement of the device and method for casting a molten metal, in particular steel, in a continuous casting mold, using a hollow jet nozzle, where the metallic material is finely divided is injected into the interior volume of the hollow jet, the latter being maintained by circulation of a flow of non-oxidizing gas such as argon.
  • the molten steel is introduced into the mold by means of at least one nozzle, that is to say a generally tubular element arranged between the tundish and the mold. .
  • the lower end of the nozzle is usually provided with one or two outlets located in the axis of the nozzle or laterally, and opens under the free level of liquid steel present in the mold.
  • a protective gas such as argon under the distribution dome of the steel ensures the formation and maintenance of the hollow jet inside the nozzle.
  • the introduction of the protective gas under pressure in the conduit causes an overpressure which prevents any entrainment of air by the liquid steel, which would lead to the oxidation thereof or to the formation of alumina with clogging. the nozzle.
  • the injection of the powder is carried out by pneumatic transport under argon through the refractory dome creating the hollow jet.
  • the document WO-2006/096942 describes an installation and method for injection of technical ceramic nanoparticles into the hollow jet created in a HJN nozzle.
  • the injection of the nanoparticles can be carried out by means of a mechanical transport device such as a worm.
  • a mechanical transport device such as a worm.
  • this document does not mention, for this embodiment, the positioning and the characteristics that the auger device must possess to be operational, nor how the non-oxidizing gas necessary for the establishment of the hollow jet and the protection of the casting metal is conveyed into the nozzle, in connection with the injection of nanoparticles.
  • the flow rate of the carrier gas increases depending on the amount of powder to be injected by the existing system.
  • the figure 1 shows an example of a relationship between the powder flow rate and the argon flow rate for an iron powder with a particle size of between 100 and 200 ⁇ m injected into a tube 10 mm in diameter. This therefore limits the amount of injectable powder in the product, especially in the case of continuous slab casting where the powder flow rates must be greater than for the casting of billets.
  • the maximum quantity allowed gas is 15 Nl / min
  • the rate of powder injected is limited to 13 kg / min.
  • the present invention aims to provide a solution that makes it possible to overcome the disadvantages of the state of the art.
  • the invention aims to allow the injection of a quantity of metal powder into a HJN nozzle at a high flow rate while maintaining a flow rate of the protective gas of the hollow jet acceptable in intensity for stable operation of the casting continuously.
  • a first object of the present invention relates to a continuous casting plant for the flow of liquid steel from a tundish in an ingot mold through a hollow jet nozzle, called the HJN nozzle, comprising mainly, if it is 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 cover having an inlet for the liquid steel from the tundish and a lower base having at least one outlet, said duct comprising in its upper part a distributor member disposed substantially at the inlet of said vertical duct and comprising a deflector or dome for diverting the incoming metal to the side walls of the nozzle, said nozzle also comprising injection means of metal powder or solid metal finely divided under said dome in an injection zone and non-oxidizing gas injection means for the establishment and maintenance of the hollow jet, characterized in that the powder injection means are independent and physically separate from the injection means of the non-oxidizing gas, so that in operation the non-oxidizing gas is not used as a vector for powder injection.
  • said installation comprises on the one hand a conduit for the incoming flow of non-oxidizing gas in the nozzle at a first orifice, possibly terminated by an injector located at this first orifice and its flow measuring device. and pressure and secondly, separately, a conduit for supplying the powder nozzle, at a second orifice, optionally terminated by an injector located at this second orifice, a powder reservoir or finely divided particles and its weight measuring device.
  • the powder injection means comprise mechanical means such as a worm device.
  • the worm gear device is disposed between the bottom of the tundish and the upper cover of the nozzle HJN.
  • the conduit for the supply of the powder nozzle opens under the distribution dome, at least a portion of this conduit being arranged in the distribution dome with a non-zero slope.
  • the installation is provided with means for controlling the flow of powder, said means preferably comprising a servocontrol of the rotation of the worm to a continuous measurement of the weight of the powder reservoir.
  • the powder injection means are maintained under an inert atmosphere.
  • the non-oxidizing gas comprises argon and said metal powder is an iron or ferroalloy powder.
  • the figure 1 graphically represents the relationship between the flow of injected metal powder and the flow of argon in which it is in suspension, for injection into a continuous jet casting nozzle.
  • the figure 2 represents an embodiment of an exemplary device according to the state of the art.
  • the figure 3 represents a preferred embodiment of the device according to the present invention.
  • the figure 2 shows a casting device according to the state of the art (patent BE 1014063 ), mounted between a continuous casting mold 1 and a pouring ladle or a tundish 2 comprising an outlet conduit 3.
  • the outlet conduit 3 is provided with a flow regulator, such as a stopper 4 or a sliding drawer.
  • the upper base of the cylinder is in contact with the conduit 3. This base is provided with a hole corresponding to the inner orifice of the conduit.
  • the nozzle 5 comprises at its lower part at least one communication port 8 allowing the passage of steel to the mold.
  • a dome-shaped distribution member 6 In the upper part of the nozzle 5 is arranged a dome-shaped distribution member 6, whose upper surface is slightly sloping, preferably greater than 10 °, relative to the horizontal.
  • An injection device is arranged to introduce finely divided solid particles or powder 15 under the dome 6, using a non-oxidizing gas as a carrier.
  • This device also comprises an inlet stream of argon 7 and its flow measuring device 9 and pressure device 10, a powder container or finely divided particles 11 and its weight measuring device 12, and finally a feed pipe in the nozzle 13, and an injector 14.
  • the subject of the present invention is a device which makes it possible to separate the quantity of powder injected into the hollow jet nozzle from the quantity of argon added for the creation and maintenance of the hollow jet.
  • the device of the invention shown schematically on the figure 3 thus comprises means for separating the gas supply and the powder injection.
  • the supply of metal powder is ensured by means of a supply line 13, for example passing through the distributing dome 6, opening under it at an orifice 14, possibly provided with an injector of appropriate form not shown, and provided with a worm 13A.
  • a supply line 13 for example passing through the distributing dome 6, opening under it at an orifice 14, possibly provided with an injector of appropriate form not shown, and provided with a worm 13A.
  • Argon injection, independent of the injection of powder, intended solely to maintain the hollow jet is provided by an additional conduit 16 terminated by an orifice 17, optionally provided with an injector of appropriate shape not shown, opening for example also under the distribution dome 6.
  • a regulation of the powder flow rate will be ensured by a control of the speed of rotation of the screw, slaved to a continuous measurement of the weight of the powder reservoir.
  • the entire injection system is maintained under an inert atmosphere of argon to prevent oxygen scavenging in the steel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Nozzles (AREA)

Abstract

The invention relates to a continuous casting equipment for a flow of liquid steel from a tundish (2) into an ingot mould (1) through a hollow jet nozzle or HJN nozzle, comprising a deflector or dome (6) for diverting the incoming metal towards the side walls of the nozzle, said nozzle further including means for injecting a metallic powder or a finely ground solid metallic material (13, 13A, 14) under said dome (6) in an injection area (15), and means for injecting a non-oxidant gas (16, 17) for creating and maintaining the hollow jet, characterised in that the powder injection means (13, 13A, 14) are independent and physically separated from the non-oxidant gas injection means (16, 17) so that during the operation, the non-oxidant gas is not used as a vector for powder injection.

Description

Objet de l'inventionObject of the invention

La présente invention se rapporte à une amélioration du dispositif et du procédé de coulée d'un métal en fusion, en particulier de l'acier, dans une lingotière de coulée continue, en utilisant une busette en jet creux, où de la matière métallique finement divisée est injectée dans le volume intérieur du jet creux, ce dernier étant maintenu par circulation d'un débit de gaz non oxydant tel que l'argon.The present invention relates to an improvement of the device and method for casting a molten metal, in particular steel, in a continuous casting mold, using a hollow jet nozzle, where the metallic material is finely divided is injected into the interior volume of the hollow jet, the latter being maintained by circulation of a flow of non-oxidizing gas such as argon.

Etat de la techniqueState of the art

Il est connu que, dans la technique de coulée continue, l'acier en fusion est introduit dans la lingotière au moyen d'au moins une busette, c'est-à-dire un élément généralement tubulaire disposé entre le panier répartiteur et la lingotière. L'extrémité inférieure de la busette est pourvue habituellement d'un ou deux orifices de sortie sis dans l'axe de la busette ou latéralement, et débouche sous le niveau libre d'acier liquide présent dans la lingotière.It is known that, in the continuous casting technique, the molten steel is introduced into the mold by means of at least one nozzle, that is to say a generally tubular element arranged between the tundish and the mold. . The lower end of the nozzle is usually provided with one or two outlets located in the axis of the nozzle or laterally, and opens under the free level of liquid steel present in the mold.

La busette de coulée en jet creux, dite HJN, pour hollow jet nozzle, a été développée il y a une vingtaine d'année pour la coulée continue d'acier à basse surchauffe. Le principe, décrit dans le brevet EP-B-269 180 , était de refroidir l'acier au moyen d'un échangeur de chaleur constitué d'un tube en cuivre refroidi à l'eau combiné avec un déflecteur ou dôme, juste avant son entrée dans la lingotière et sa solidification. L'idée principale du brevet était de créer un jet creux à l'intérieur de la busette avec ruissellement sur la paroi intérieure de l'échangeur de chaleur, permettant le refroidissement de l'acier en vue :

  • d'une part de permettre une solidification de l'acier liquide, en passant par la phase pâteuse, sans bouchage de la busette, ;
  • d'autre part, d'augmenter la surface d'échange entre l'acier liquide et la surface de refroidissement pour augmenter la puissance de refroidissement.
The hollow jet nozzle, called HJN, for hollow jet nozzle, was developed about twenty years ago for the continuous casting of low overheating steel. The principle, described in the patent EP-B-269,180 , was to cool the steel by means of a heat exchanger consisting of a water-cooled copper tube combined with a deflector or dome, just before its entrance in the mold and its solidification. The main idea of the patent was to create a hollow jet inside the nozzle with runoff on the inner wall of the heat exchanger, allowing the cooling of the steel to:
  • on the one hand to allow solidification of the liquid steel, through the pasty phase, without clogging the nozzle,;
  • on the other hand, to increase the exchange surface between the liquid steel and the cooling surface to increase the cooling power.

Une injection d'un gaz protecteur tel que l'argon sous le dôme de répartition de l'acier assure la formation et le maintien du jet creux à l'intérieur de la busette. De plus, l'introduction du gaz protecteur sous pression dans le conduit provoque une surpression qui empêche tout entraînement d'air par l'acier liquide, qui conduirait à l'oxydation de celui-ci ou à la formation d'alumine avec bouchage de la busette.An injection of a protective gas such as argon under the distribution dome of the steel ensures the formation and maintenance of the hollow jet inside the nozzle. In addition, the introduction of the protective gas under pressure in the conduit causes an overpressure which prevents any entrainment of air by the liquid steel, which would lead to the oxidation thereof or to the formation of alumina with clogging. the nozzle.

Un second brevet essentiel, EP-B-605379 , déposé en 1993, a pour objet l'injection de poudre métallique à l'intérieur du jet creux créé dans la busette HJN. Selon le cas, on peut injecter, toujours dans le cas de la coulée d'acier :

  • de la poudre de fer pour créer des germes de solidification et affiner la structure de solidification ;
  • de la poudre de ferro-alliage pour modifier la composition de l'acier in situ et améliorer les rendements d'addition dans le cas des éléments aisément oxydables.
A second essential patent, EP-B-605379 , filed in 1993, has for object the injection of metal powder inside the hollow jet created in the nozzle HJN. Depending on the case, one can inject, always in the case of the casting of steel:
  • iron powder to create solidification seeds and refine the solidification structure;
  • ferroalloy powder to modify the composition of the steel in situ and improve the addition efficiencies in the case of easily oxidizable elements.

Toujours selon ce dernier brevet, l'injection de la poudre est réalisée par transport pneumatique sous argon au travers du dôme en réfractaire créant le jet creux.
Le document WO-A-2006/096942 , décrit une installation et un procédé pour l'injection de nanoparticules de céramique technique à l'intérieur du jet creux créé dans une busette HJN. Selon un mode d'exécution particulier de l'invention, l'injection des nanoparticules peut s'effectuer au moyen d'un dispositif mécanique de transport tel qu'une vis sans fin. Ce document ne fait cependant pas état, pour ce mode d'exécution, du positionnement et des caractéristiques que doit posséder le dispositif de vis sans fin pour être opérationnel, ni comment le gaz non oxydant nécessaire à l'établissement du jet creux et à la protection du métal de coulée est acheminé dans la busette, en relation avec l'injection de nanoparticules.Still according to the latter patent, the injection of the powder is carried out by pneumatic transport under argon through the refractory dome creating the hollow jet.
The document WO-2006/096942 , describes an installation and method for injection of technical ceramic nanoparticles into the hollow jet created in a HJN nozzle. According to a particular embodiment of the invention, the injection of the nanoparticles can be carried out by means of a mechanical transport device such as a worm. However, this document does not mention, for this embodiment, the positioning and the characteristics that the auger device must possess to be operational, nor how the non-oxidizing gas necessary for the establishment of the hollow jet and the protection of the casting metal is conveyed into the nozzle, in connection with the injection of nanoparticles.

Position du problèmePosition of the problem

Les nombreux essais industriels réalisés avec cet équipement ont fait apparaître une contrainte pratique majeure de mise en oeuvre du procédé dans la coulée continue. La quantité d'argon utilisée doit absolument être limitée au niveau de la lingotière à 15 à 20 Nl/min, cette valeur dépendant de la caractéristique de la machine en format et vitesse de coulée, dans le but :

  • d'éviter le piégeage de bulles d'argon dans la peau en cours de solidification, la présence de bulles sous-cutanées pouvant créer après laminage des défauts de surface importants ;
  • de réduire la perturbation du niveau d'acier se trouvant en lingotière par la remontée de bulles d'argon à la surface. Les variations importantes du niveau qui en résultent pénalisent fortement l'état de surface du produit brut de coulée et peuvent entraîner le piégeage de la poudre de couverture dans la peau solidifiée, pénalisant la qualité du produit final.
The numerous industrial tests carried out with this equipment have revealed a major practical constraint for implementing the process in continuous casting. The amount of argon used must absolutely be limited at the level of the mold to 15 to 20 Nl / min, this value depending on the characteristic of the machine in format and casting speed, in order to:
  • avoid the trapping of argon bubbles in the skin during solidification, the presence of subcutaneous bubbles that can create after rolling significant surface defects;
  • to reduce the disturbance of the steel level in the mold by the rise of argon bubbles on the surface. The resulting large variations in the level severely penalize the surface condition of the raw product of casting and can cause the trapping of the cover powder in the solidified skin, penalizing the quality of the final product.

Dans la pratique, le débit du gaz transporteur augmente en fonction de la quantité de poudre à injecter par le système existant. La figure 1 montre un exemple de relation entre le débit de poudre et le débit d'argon pour une poudre de fer de granulométrie comprise entre 100 et 200 µm injectée dans un tube de 10 mm de diamètre. Ceci limite donc la quantité de poudre injectable dans le produit, surtout dans le cas de la coulée continue de brames où les débits de poudre doivent être plus importants que pour la coulée de billettes. Dans le cas particulier de la figure 1, si la quantité maximale autorisée de gaz est de 15 Nl/min, le débit de poudre injectée est limité à 13 kg/min environ.In practice, the flow rate of the carrier gas increases depending on the amount of powder to be injected by the existing system. The figure 1 shows an example of a relationship between the powder flow rate and the argon flow rate for an iron powder with a particle size of between 100 and 200 μm injected into a tube 10 mm in diameter. This therefore limits the amount of injectable powder in the product, especially in the case of continuous slab casting where the powder flow rates must be greater than for the casting of billets. In the particular case of figure 1 , if the maximum quantity allowed gas is 15 Nl / min, the rate of powder injected is limited to 13 kg / min.

Buts de l'inventionGoals of the invention

La présente invention vise à fournir une solution qui permette de s'affranchir des inconvénients de l'état de la technique.The present invention aims to provide a solution that makes it possible to overcome the disadvantages of the state of the art.

En particulier, l'invention a pour but de permettre l'injection d'une quantité de poudre métallique dans une busette HJN selon un débit élevé tout en conservant un débit du gaz protecteur du jet creux acceptable en intensité pour un fonctionnement stable de la coulée en continu.In particular, the invention aims to allow the injection of a quantity of metal powder into a HJN nozzle at a high flow rate while maintaining a flow rate of the protective gas of the hollow jet acceptable in intensity for stable operation of the casting continuously.

Principaux éléments caractéristiques de l'inventionMain characteristic elements of the invention

Un premier objet de la présente invention se rapporte à une installation de coulée continue pour l'écoulement d'acier liquide à partir d'un panier répartiteur dans une lingotière au travers d'une busette en jet creux, dite busette HJN, comprenant principalement, si elle est décrite en position verticale et considérée dans le sens de progression de l'acier liquide de haut en bas, un conduit vertical, terminé par un couvercle supérieur présentant un orifice d'entrée de l'acier liquide à partir du panier répartiteur et une base inférieure présentant au moins un orifice de sortie, ledit conduit comprenant dans sa partie supérieure un organe répartiteur disposé sensiblement à l'entrée dudit conduit vertical et comprenant un déflecteur ou dôme permettant de dévier le métal entrant vers les parois latérales de la busette, ladite busette comprenant également des moyens d'injection de poudre métallique ou de manière métallique solide finement divisée sous ledit dôme dans une zone d'injection et des moyens d'injection de gaz non oxydant pour l'établissement et le maintien du jet creux, caractérisée en ce que les moyens d'injection de poudre sont indépendants et physiquement séparés des moyens d'injection du gaz non oxydant, de sorte qu'en fonctionnement le gaz non oxydant n'est pas utilisé comme vecteur pour l'injection de poudre.A first object of the present invention relates to a continuous casting plant for the flow of liquid steel from a tundish in an ingot mold through a hollow jet nozzle, called the HJN nozzle, comprising mainly, if it is 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 cover having an inlet for the liquid steel from the tundish and a lower base having at least one outlet, said duct comprising in its upper part a distributor member disposed substantially at the inlet of said vertical duct and comprising a deflector or dome for diverting the incoming metal to the side walls of the nozzle, said nozzle also comprising injection means of metal powder or solid metal finely divided under said dome in an injection zone and non-oxidizing gas injection means for the establishment and maintenance of the hollow jet, characterized in that the powder injection means are independent and physically separate from the injection means of the non-oxidizing gas, so that in operation the non-oxidizing gas is not used as a vector for powder injection.

Selon l'invention, ladite installation comprend d'une part un conduit pour le flux entrant de gaz non oxydant dans la busette au niveau d'un premier orifice, éventuellement terminé par un injecteur sis à ce premier orifice et son dispositif de mesure de flux et de pression et d'autre part, séparément, un conduit pour l'alimentation de la busette en poudre, au niveau d'un second orifice, éventuellement terminé par un injecteur sis à ce second orifice, un réservoir de poudre ou particules finement divisées et son dispositif de mesure de poids.According to the invention, said installation comprises on the one hand a conduit for the incoming flow of non-oxidizing gas in the nozzle at a first orifice, possibly terminated by an injector located at this first orifice and its flow measuring device. and pressure and secondly, separately, a conduit for supplying the powder nozzle, at a second orifice, optionally terminated by an injector located at this second orifice, a powder reservoir or finely divided particles and its weight measuring device.

Avantageusement, les moyens d'injection de poudre comprennent des moyens mécaniques tels qu'un dispositif à vis sans fin.Advantageously, the powder injection means comprise mechanical means such as a worm device.

Selon une modalité préférée de l'invention, le dispositif à vis sans fin est disposé entre le bas du panier répartiteur et le couvercle supérieur de la busette HJN.According to a preferred embodiment of the invention, the worm gear device is disposed between the bottom of the tundish and the upper cover of the nozzle HJN.

De préférence, le conduit pour l'alimentation de la busette en poudre débouche sous le dôme répartiteur, au moins une partie de ce conduit étant aménagée dans le dôme répartiteur avec une pente non nulle.Preferably, the conduit for the supply of the powder nozzle opens under the distribution dome, at least a portion of this conduit being arranged in the distribution dome with a non-zero slope.

Avantageusement, l'installation est pourvue de moyens pour assurer la régulation du débit de poudre, lesdits moyens comprenant de préférence un asservissement de la rotation de la vis sans fin à une mesure en continu du poids du réservoir de poudre.Advantageously, the installation is provided with means for controlling the flow of powder, said means preferably comprising a servocontrol of the rotation of the worm to a continuous measurement of the weight of the powder reservoir.

Toujours avantageusement, les moyens d'injection de poudre sont maintenus sous atmosphère inerte.Still advantageously, the powder injection means are maintained under an inert atmosphere.

De préférence, le gaz non oxydant comprend de l'argon et ladite poudre métallique est une poudre de fer ou de ferro-alliage.Preferably, the non-oxidizing gas comprises argon and said metal powder is an iron or ferroalloy powder.

Un second objet de la présente invention concerne un procédé pour la coulée continue d'acier en jet creux, de préférence sous la forme de produits plats ou longs, au moyen de l'installation précitée, comprenant les étapes suivantes :

  • coulée d'un acier de base en fusion du panier répartiteur vers la lingotière au travers de la busette HJN ;
  • établissement et maintien du jet creux par injection à partir d'un premier conduit d'un gaz non oxydant tel que l'argon à un débit ne dépassant pas 15 Nl/min ;
  • injection par un second conduit, indépendant du premier conduit, de matière métallique solide finement divisée ou en poudre dans la partie creuse du jet sous l'organe répartiteur, ladite matière solide finement divisée ou en poudre se mélangeant avec l'acier à la fin de la zone d'injection dans la busette ou à la zone de jonction de la busette et de la lingotière.
A second object of the present invention relates to a method for the continuous casting of hollow-jet steel, preferably in the form of flat or long products, by means of the aforementioned installation, comprising the following steps:
  • pouring molten base steel from the tundish to the mold through the HJN nozzle;
  • establishing and maintaining the hollow jet by injection from a first conduit of a non-oxidizing gas such as argon at a rate not exceeding 15 Nl / min;
  • injection by a second conduit, independent of the first conduit, of finely divided or powdered solid metal material into the hollow portion of the jet under the tundish, said finely divided or powdered solid material mixing with the steel at the end of the injection zone in the nozzle or the junction zone of the nozzle and the mold.

Brève description des figuresBrief description of the figures

La figure 1, déjà mentionnée, représente graphiquement la relation entre le débit de poudre métallique injectée et le débit d'argon dans lequel celle-ci est en suspension, pour une injection dans une busette de coulée continue en jet creux.The figure 1 , already mentioned, graphically represents the relationship between the flow of injected metal powder and the flow of argon in which it is in suspension, for injection into a continuous jet casting nozzle.

La figure 2 représente une forme d'exécution l'un exemple de dispositif selon l'état de la technique.The figure 2 represents an embodiment of an exemplary device according to the state of the art.

La figure 3 représente une forme d'exécution préférée du dispositif selon la présente invention.The figure 3 represents a preferred embodiment of the device according to the present invention.

Description d'une forme d'exécution selon l'état de la techniqueDescription of an embodiment according to the state of the art

La figure 2 montre un dispositif de coulée selon l'état de la technique (brevet BE 1014063 ), monté entre une lingotière de coulée continue 1 et une poche de coulée ou un panier répartiteur de coulée 2 comportant un conduit de sortie 3. Le conduit de sortie 3 est muni d'un régulateur de débit, tel qu'une quenouille 4 ou un tiroir coulissant. Une busette 5, ayant essentiellement la forme d'un cylindre, éventuellement de section ovale, fixée au panier répartiteur, est sise au-dessus de la lingotière 1 et y plonge. La base supérieure du cylindre est en contact avec le conduit 3. Cette base est pourvue d'un orifice correspondant à l'orifice intérieur du conduit. La busette 5 comporte à sa partie inférieure au moins une ouïe de communication 8 permettant le passage de l'acier vers la lingotière. Dans la partie supérieure de la busette 5 est disposé un organe répartiteur en forme de dôme 6, dont la surface supérieure est en légère pente, de préférence supérieure à 10°, par rapport à l'horizontale. Un dispositif d'injection est disposé de manière à introduire sous le dôme 6 des particules solides finement divisées ou en poudre 15, en utilisant un gaz non oxydant comme vecteur. Ce dispositif comprend également un flux entrant d'argon 7 et son dispositif de mesure de flux 9 et de pression 10, un conteneur de poudre ou particules finement divisées 11 et son dispositif de mesure de poids 12, et enfin une conduite d'alimentation dans la busette 13, ainsi qu'un injecteur 14.The figure 2 shows a casting device according to the state of the art (patent BE 1014063 ), mounted between a continuous casting mold 1 and a pouring ladle or a tundish 2 comprising an outlet conduit 3. The outlet conduit 3 is provided with a flow regulator, such as a stopper 4 or a sliding drawer. A nozzle 5, having essentially the shape of a cylinder, possibly of oval section, attached to the tundish, is located above the mold 1 and plunges therein. The upper base of the cylinder is in contact with the conduit 3. This base is provided with a hole corresponding to the inner orifice of the conduit. The nozzle 5 comprises at its lower part at least one communication port 8 allowing the passage of steel to the mold. In the upper part of the nozzle 5 is arranged a dome-shaped distribution member 6, whose upper surface is slightly sloping, preferably greater than 10 °, relative to the horizontal. An injection device is arranged to introduce finely divided solid particles or powder 15 under the dome 6, using a non-oxidizing gas as a carrier. This device also comprises an inlet stream of argon 7 and its flow measuring device 9 and pressure device 10, a powder container or finely divided particles 11 and its weight measuring device 12, and finally a feed pipe in the nozzle 13, and an injector 14.

Description d'une forme d'exécution préférée de l'inventionDescription of a preferred embodiment of the invention

Afin d'apporter une solution au problème posé ci-dessus, la présente invention a pour objet un dispositif qui permette de dissocier la quantité de poudre injectée dans la busette à jet creux de la quantité d'argon ajoutée pour la création et le maintien du jet creux.In order to provide a solution to the problem set out above, the subject of the present invention is a device which makes it possible to separate the quantity of powder injected into the hollow jet nozzle from the quantity of argon added for the creation and maintenance of the hollow jet.

Le dispositif de l'invention, représenté schématiquement sur la figure 3, comporte ainsi des moyens pour séparer l'arrivée de gaz et l'injection de poudre.The device of the invention, shown schematically on the figure 3 thus comprises means for separating the gas supply and the powder injection.

Selon l'invention, l'alimentation en poudre métallique est assurée au moyen d'une conduite d'alimentation 13, passant par exemple au travers du dôme répartiteur 6, débouchant sous celui-ci au niveau d'un orifice 14, éventuellement doté d'un injecteur de forme appropriée non représenté, et munie d'une vis sans fin 13A. L'injection d'argon, indépendante de l'injection de poudre, destinée uniquement à maintenir le jet creux est assurée par un conduit supplémentaire 16 terminé par un orifice 17, éventuellement doté d'un injecteur de forme appropriée non représenté, débouchant par exemple également sous le dôme répartiteur 6.According to the invention, the supply of metal powder is ensured by means of a supply line 13, for example passing through the distributing dome 6, opening under it at an orifice 14, possibly provided with an injector of appropriate form not shown, and provided with a worm 13A. Argon injection, independent of the injection of powder, intended solely to maintain the hollow jet is provided by an additional conduit 16 terminated by an orifice 17, optionally provided with an injector of appropriate shape not shown, opening for example also under the distribution dome 6.

Grâce à ce système, on peut dissocier l'injection de poudre et de gaz et donc ajouter de manière contrôlée de plus grandes quantités de poudre dans l'acier liquide tout en maintenant un bon écoulement de l'acier en lingotière, et notamment sans perturbation du ménisque ni entraînement profond de bulles d'argon.With this system, we can dissociate the injection of powder and gas and thus add controlled amounts of larger amounts of powder in the liquid steel while maintaining a good flow of steel in the mold, and in particular without disturbance meniscus or deep entrainment of argon bubbles.

Selon une forme d'exécution particulièrement avantageuse, la vis sans fin 13A du système d'injection de poudre selon l'invention sera placée entre le bas du panier répartiteur 2 et le couvercle 5A de la busette HJN 5. Cet emplacement particulier a le double avantage :

  • de positionner la vis 13A dans un endroit où les températures sont soutenables pour un système mécanique et,
  • de profiter de la gravité pour laisser s'écouler la poudre à travers le couvercle supérieur et le dôme de la busette HJN.
According to a particularly advantageous embodiment, the worm 13A of the powder injection system according to the invention will be placed between the bottom of the tundish 2 and the cover 5A of the nozzle HJN 5. This particular location has the double advantage:
  • to position the screw 13A in a place where the temperatures are sustainable for a mechanical system and,
  • take advantage of the gravity to let the powder flow through the top cover and the dome of the HJN nozzle.

Avantageusement, une régulation du débit de poudre sera assurée par un contrôle de la vitesse de rotation de la vis, asservi à une mesure en continu du poids du réservoir de poudre. De plus, tout le système d'injection est maintenu sous une atmosphère inerte d'argon pour éviter tout piégeage d'oxygène dans l'acier.Advantageously, a regulation of the powder flow rate will be ensured by a control of the speed of rotation of the screw, slaved to a continuous measurement of the weight of the powder reservoir. In addition, the entire injection system is maintained under an inert atmosphere of argon to prevent oxygen scavenging in the steel.

Claims (12)

  1. Continuous casting installation for casting molten steel from a tundish (2) into a mould (1) through a hollow jet nozzle, called an HJN nozzle, mainly comprising, if described in a vertical position and considered in the motion direction of the molten steel from top to bottom, a vertical pipe (5) ending in a top cover (5A) with an intake aperture for the molten steel from the tundish (2) and a bottom base with at least one outlet aperture (8), said pipe (5) comprising in its upper part a distribution device arranged more or less at the intake of said vertical pipe (5) and comprising a deflector or dome (6) which allows to divert towards the side walls of the nozzle the metal that enters, said nozzle also comprising a means (13, 13A,14) for injecting metal powder or finely divided solid metal material, comprising a worm device (13A) under said dome (6) in an injection zone (15) and a means for injecting non-oxidising gas (16,17) so as to create and maintain the hollow jet, characterised in that the means for injecting powder are independent of and physically separated from the means for injecting non-oxidising gas (16,17), the worm device (13A) being positioned between the bottom of the tundish (2) and the top cover (5a) of the HJN nozzle.
  2. Installation according to Claim 1, characterised in that it comprises a pipe (16) for the incoming flow of non-oxidising gas (7) in the nozzle at the level of the first aperture (17), and its device for measuring flow (9) and pressure (10).
  3. Installation according to Claim 2, characterised in that said pipe (16) for the incoming flow of non-oxidising gas ends in an injector located at the first aperture (17).
  4. Installation according to Claim 1, 2 or 3, characterised in that it comprises a separate pipe (13) for supplying the nozzle with powder at the level of the second aperture (14), a tank of powder or finely divided particles (11) and its weight-measuring device (12).
  5. Installation according to Claim 4, characterised in that said pipe (13) for supplying the nozzle with powder ends in an injector located at the second aperture (14).
  6. Installation according to Claim 4, characterised in that the pipe for supplying the nozzle with powder (13) emerges under the deflector dome (6), at least a part of this pipe being set into the deflector dome (6) with a non-zero slope.
  7. Installation according to Claim 1, characterised in that it is equipped with a means for ensuring the regulation of the flow rate of powder.
  8. Installation according to Claim 7, characterised in that said means comprises a control for the rotation of the worm (13A) by the continuous measurement of the weight of the powder tank (11).
  9. Installation according to any of the preceding claims, characterised in that the means for injecting powder (13,13A,14) are maintained in an inert atmosphere.
  10. Installation according to any of the preceding claims, characterised in that the non-oxidising gas comprises argon.
  11. Installation according to any of the preceding claims, characterised in that said metal powder is an iron or ferro-alloy powder.
  12. Method for the continuous casting of steel in a hollow jet, preferably in the form of flat or long products, by means of the installation according to any of the preceding claims, comprising the following steps:
    - casting a basic molten steel from the tundish (2) to the mould (1) through the HJN nozzle (5);
    - creating and maintaining the hollow jet by injection from a first pipe (16) of a non-oxidising gas such as argon at a flow rate not exceeding 15 Nl/min;
    - injecting by a second pipe (13), which is independent of the first pipe and comprises a worm device (13A), a finely divided solid metal material or material in powder form into the hollow part of the jet under the distribution device (6), said finely divided solid material or material in powder form mixing with the steel at the end of the injection zone in the nozzle or in the zone where the nozzle meets the mould.
EP07800357A 2006-12-12 2007-09-03 Hollow jet nozzle for continuous steel casting Active EP2099576B8 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL07800357T PL2099576T3 (en) 2006-12-12 2007-09-03 Hollow jet nozzle for continuous steel casting
SI200730287T SI2099576T1 (en) 2006-12-12 2007-09-03 Hollow jet nozzle for continuous steel casting

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2006/0609A BE1017392A3 (en) 2006-12-12 2006-12-12 HOLLOW JET BUSHET FOR CONTINUOUS STEEL CASTING.
PCT/BE2007/000100 WO2008070935A1 (en) 2006-12-12 2007-09-03 Hollow jet nozzle for continuous steel casting

Publications (3)

Publication Number Publication Date
EP2099576A1 EP2099576A1 (en) 2009-09-16
EP2099576B1 true EP2099576B1 (en) 2010-05-19
EP2099576B8 EP2099576B8 (en) 2010-07-21

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EP07800357A Active EP2099576B8 (en) 2006-12-12 2007-09-03 Hollow jet nozzle for continuous steel casting

Country Status (10)

Country Link
EP (1) EP2099576B8 (en)
KR (1) KR101454311B1 (en)
AT (1) ATE468188T1 (en)
BE (1) BE1017392A3 (en)
BR (1) BRPI0718348B1 (en)
DE (1) DE602007006689D1 (en)
ES (1) ES2343979T3 (en)
PL (1) PL2099576T3 (en)
SI (1) SI2099576T1 (en)
WO (1) WO2008070935A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013144668A1 (en) 2012-03-28 2013-10-03 Arcelormittal Investigacion Y Desarrollo Sl Continuous casting process of metal
US9498822B2 (en) 2012-03-28 2016-11-22 Arcelormittal Investigacion Y Desarrollo, S.L. Continuous casting equipment
CN111451462A (en) * 2020-04-09 2020-07-28 苏州大学 Method for refining solidification structure of continuous casting billet by utilizing submerged nozzle to spray magnesium powder
CN111496240A (en) * 2020-06-24 2020-08-07 攀钢集团攀枝花钢铁研究院有限公司 Submerged entry nozzle for continuous casting
CN111570782A (en) * 2020-06-24 2020-08-25 攀钢集团攀枝花钢铁研究院有限公司 Continuous casting submersed nozzle

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KR101443348B1 (en) * 2013-03-28 2014-09-19 현대제철 주식회사 Device for desulfurizing molten steel
EP3056304A1 (en) * 2015-02-16 2016-08-17 Uvån Holding AB A nozzle and a tundish arrangement for the granulation of molten material
WO2024127075A1 (en) * 2022-12-16 2024-06-20 Arcelormittal Continuous casting equipment
WO2024127073A1 (en) * 2022-12-16 2024-06-20 Arcelormittal Continuous casting equipment
WO2024127076A1 (en) * 2022-12-16 2024-06-20 Arcelormittal Continuous casting equipment
WO2024161178A1 (en) * 2023-01-31 2024-08-08 Arcelormittal Continuous casting equipment
WO2024201113A1 (en) * 2023-03-31 2024-10-03 Arcelormittal Continuous casting equipment

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013144668A1 (en) 2012-03-28 2013-10-03 Arcelormittal Investigacion Y Desarrollo Sl Continuous casting process of metal
CN104220190A (en) * 2012-03-28 2014-12-17 安赛乐米塔尔研发有限公司 Continuous casting process of metal
US9498822B2 (en) 2012-03-28 2016-11-22 Arcelormittal Investigacion Y Desarrollo, S.L. Continuous casting equipment
CN111451462A (en) * 2020-04-09 2020-07-28 苏州大学 Method for refining solidification structure of continuous casting billet by utilizing submerged nozzle to spray magnesium powder
CN111451462B (en) * 2020-04-09 2021-09-28 苏州大学 Method for refining solidification structure of continuous casting billet by utilizing submerged nozzle to spray magnesium powder
CN111496240A (en) * 2020-06-24 2020-08-07 攀钢集团攀枝花钢铁研究院有限公司 Submerged entry nozzle for continuous casting
CN111570782A (en) * 2020-06-24 2020-08-25 攀钢集团攀枝花钢铁研究院有限公司 Continuous casting submersed nozzle

Also Published As

Publication number Publication date
PL2099576T3 (en) 2010-10-29
BRPI0718348A2 (en) 2013-11-26
SI2099576T1 (en) 2010-08-31
EP2099576B8 (en) 2010-07-21
ES2343979T3 (en) 2010-08-13
EP2099576A1 (en) 2009-09-16
KR101454311B1 (en) 2014-10-23
WO2008070935A1 (en) 2008-06-19
KR20090095590A (en) 2009-09-09
ATE468188T1 (en) 2010-06-15
DE602007006689D1 (en) 2010-07-01
BE1017392A3 (en) 2008-08-05
BRPI0718348B1 (en) 2016-03-29

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