WO2008070935A1 - Hollow jet nozzle for continuous steel casting - Google Patents
Hollow jet nozzle for continuous steel casting Download PDFInfo
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- WO2008070935A1 WO2008070935A1 PCT/BE2007/000100 BE2007000100W WO2008070935A1 WO 2008070935 A1 WO2008070935 A1 WO 2008070935A1 BE 2007000100 W BE2007000100 W BE 2007000100W WO 2008070935 A1 WO2008070935 A1 WO 2008070935A1
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- powder
- nozzle
- installation according
- injection
- conduit
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Classifications
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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
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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
- 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
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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
- B22D11/108—Feeding additives, powders, or the like
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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
- 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 the casting process of a molten metal, in particular steel, in a continuous casting mold, using a hollow jet nozzle, where the finely divided metal material 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 disposed between the distributor basket 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.
- the hollow jet nozzle was developed about twenty years ago for the continuous casting of steel at low overheating.
- 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:
- 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:
- the injection of the powder is carried out by pneumatic transport under argon through the refractory dome creating the hollow jet.
- the numerous industrial tests carried out with this equipment have revealed a major practical constraint for implementing the method in the 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:
- FIG. 1 shows an example of a relationship between the powder flow rate and the argon flow rate for an iron powder having 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 rate of powder injected is limited to 13 kg / min.
- the present invention aims to provide a solution that overcomes the disadvantages of the state of the art.
- the invention aims to allow the injection of a quantity of metal powder in 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 continuous casting.
- a first object of the present invention relates to a continuous casting plant for the flow of liquid steel from a tundish into an ingot mold through a spout.
- hollow jet called 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 duct, terminated by an upper cover having an inlet port of the liquid steel from the distributor basket 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 to deflect the metal entering the side walls of the nozzle, said nozzle also comprising metal powder injection means or solid metal material 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
- 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 device. flow and pressure measurement and secondly, separately, a conduit for supplying the powder nozzle, at a second orifice, possibly 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 gear device.
- the worm device is disposed between the bottom of the tundish and the top cover of the nozzle HJN.
- the conduit for the supply of the powder nozzle discharges 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.
- a second object of the present invention relates to a process 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:
- FIG. 1 graphically represents the relationship between the flow rate of injected metal powder and the flow of argon in which it
- i is in suspension, for injection into a nozzle the continuous casting in hollow jet.
- Figure 2 shows an embodiment of an exemplary device according to the state of the art.
- Figure 3 shows a preferred embodiment of the device according to the present invention.
- 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 ladle or a tundish 2 comprising an outlet duct 3
- the outlet duct 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 flow 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 supply line in the nozzle 13, and an injector 14.
- the subject of the present invention is a device which makes it possible to dissociate the quantity of powder injected into the nozzle at hollow jet of the amount of argon added for the creation and maintenance of the hollow jet.
- the device of the invention shown schematically in Figure 3, and comprises means for separating the gas supply and powder injection.
- the supply of metal powder is ensured by means of a supply line 13, passing for example through the distribution dome 6, opening under it at an orifice 14, optionally provided with an injector of appropriate shape 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.
- the worm 13A of the powder injection system according to the invention will be placed between the bottom of the distributor basket 2 and the cover 5A of the nozzle HJM 5.
- This particular location has the double advantage: positioning the screw 13A in a place where the temperatures are sustainable for a mechanical system and,
- 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
Description
BUSETTE A JET CREUX POUR COULEE CONTINUE D'ACIER HOLLOW JET BUSHET FOR CONTINUOUS STEEL CASTING
Objet de l'inventionObject of the invention
[0001] 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 the casting process of a molten metal, in particular steel, in a continuous casting mold, using a hollow jet nozzle, where the finely divided metal material 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
[0002] II 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 disposed between the distributor basket 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.
[0003] 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 lingotiêre 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 :The hollow jet nozzle, called HJN, for hollow jet nozzle, was developed about twenty years ago for the continuous casting of steel at low overheating. The principle, described in 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 ingot 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:
- d'une part de permettre une solidification de l'acier liquide, en passant par la phase pâteuse, sans bouchage de la busette ;- On the one hand to allow solidification of the liquid steel, through the pasty phase without clogging the nozzle;
- d'autre part, d'augmenter la surface d'échange entre l'acier liquide et la surface de refroidissement pour augmenter la puissance de refroidissement .- On the other hand, to increase the exchange surface between the liquid steel and the cooling surface to increase the cooling power.
[0004] 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 a l'oxydation de celui-ci ou à la formation d'alumine avec bouchage de la busette.[0004] An injection of a protective gas such as argon under the steel distribution dome 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.
[0005] 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 :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:
- de la poudre de fer pour créer des germes . de solidification et affiner . la structure de solidification ;- iron powder to create germs. to solidify and refine. the solidification structure;
- 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.- ferroalloy powder to modify the composition of the steel in situ. and to improve the addition efficiencies in the case of. easily oxidizable elements.
[0006] 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.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.
Position du problêmePosition of the problem
[0007] Les nombreux essais industriels réalisés avec cet équipement ont fait apparaître une contrainte pratique majeure de mise en œuvre 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 :The numerous industrial tests carried out with this equipment have revealed a major practical constraint for implementing the method in the 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:
- 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 ;to avoid the trapping of argon bubbles in the skin during solidification, the presence of subcutaneous bubbles which can create, after lamination, significant surface defects;
- 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.- 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.
[0008] 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. FIG. 1 shows an example of a relationship between the powder flow rate and the argon flow rate for an iron powder having 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
[0009] 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 overcomes the disadvantages of the state of the art.
[0010] 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 in 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 continuous casting.
Principaux éléments caractéristiques de l ' invention [0011] 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 matière 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.Main features of the invention [0011] A first object of the present invention relates to a continuous casting plant for the flow of liquid steel from a tundish into an ingot mold through a spout. hollow jet, called 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 duct, terminated by an upper cover having an inlet port of the liquid steel from the distributor basket 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 to deflect the metal entering the side walls of the nozzle, said nozzle also comprising metal powder injection means or solid metal material 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.
[0012] 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. [0013] Avantageusement, les moyens d'injection de poudre comprennent des moyens mécaniques tels qu'un dispositif à vis sans fin.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 device. flow and pressure measurement and secondly, separately, a conduit for supplying the powder nozzle, at a second orifice, possibly terminated by an injector located at this second orifice, a powder reservoir or finely divided particles and its weight measuring device. [0013] Advantageously, the powder injection means comprise mechanical means such as a worm gear device.
[0014] 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 device is disposed between the bottom of the tundish and the top cover of the nozzle HJN.
[0015] 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 discharges under the distribution dome, at least a portion of this conduit being arranged in the distribution dome with a non-zero slope.
[0016] 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 . [0017] Toujours avantageusement, les moyens d'injection de poudre ' sont maintenus sous atmosphère inerte.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. [0017] Still advantageously, the powder injection means ' are maintained under an inert atmosphere.
[0018] 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.
[0019] 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 :A second object of the present invention relates to a process 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:
- coulée d'un acier de base en fusion du panier répartiteur vers la lingotière au travers de la busette HJN ;casting a molten base steel from the tundish to the mold through the HJN nozzle;
- 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 ;- Establishment and maintenance of the hollow jet injection from a first conduit of a non-oxidizing gas such as argon at a rate not exceeding 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.injection by a second duct, independent of the first duct, of finely divided or powdered solid metallic material into the hollow part of the jet under the distributor member, said finely divided solid material or powder mixed with the steel at the end injection zone in the nozzle or at the junction zone of the nozzle and the mold.
3rêve description des figures3rêve description of the figures
[0020] La figure 1, déjà mentionnée, représente jraphiquement la relation entre le débit de poudre nétallique injectée et le débit d'argon dans lequel celle-FIG. 1, already mentioned, graphically represents the relationship between the flow rate of injected metal powder and the flow of argon in which it
:i est en suspension, pour une injection dans une busette le coulée continue en jet creux.i is in suspension, for injection into a nozzle the continuous casting in hollow jet.
[0021] La figure 2 représente une forme d'exécution l'un exemple de dispositif selon l'état de la technique. . [0022] La figure 3 représente une forme d'exécution préférée du dispositif selon la présente invention.Figure 2 shows an embodiment of an exemplary device according to the state of the art. . [0022] Figure 3 shows 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
[0023] 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. Description d'une forme d'exécution préférée de l'invention [0024] 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. [0025] 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. [0026] 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.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 ladle or a tundish 2 comprising an outlet duct 3 The outlet duct 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 flow 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 supply line in the nozzle 13, and an injector 14. DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION 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 dissociate the quantity of powder injected into the nozzle at hollow jet of the amount of argon added for the creation and maintenance of the hollow jet. The device of the invention, shown schematically in Figure 3, and comprises means for separating the gas supply and powder injection. According to the invention, the supply of metal powder is ensured by means of a supply line 13, passing for example through the distribution dome 6, opening under it at an orifice 14, optionally provided with an injector of appropriate shape 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.
[0027] 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 in a controlled manner larger quantities of powder in the liquid steel while maintaining a good flow of steel in the mold, and especially without disturbing the meniscus nor deep entrainment of argon bubbles.
[0028] 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 HJM 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,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 distributor basket 2 and the cover 5A of the nozzle HJM 5. This particular location has the double advantage: positioning the screw 13A in a place where the temperatures are sustainable for a mechanical system and,
- de profiter de la gravité pour laisser s'écouler la poudre à travers le couvercle supérieur et le dôme de la busette HJN.- take advantage of the gravity to let the powder flow through the top cover and the dome of the nozzle HJN.
[0029] 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
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE602007006689T DE602007006689D1 (en) | 2006-12-12 | 2007-09-03 | HOHLE BEAM NOZZLE FOR CONTINUOUS CASTING |
| BRPI0718348A BRPI0718348B1 (en) | 2006-12-12 | 2007-09-03 | continuous casting plant for liquid steel flow and process for continuous casting of hollow jet steel |
| AT07800357T ATE468188T1 (en) | 2006-12-12 | 2007-09-03 | HOLLOW JET NOZZLE FOR CONTINUOUS CASTING |
| EP07800357A EP2099576B8 (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 |
| PL07800357T PL2099576T3 (en) | 2006-12-12 | 2007-09-03 | Hollow jet nozzle for continuous steel casting |
| KR1020097012282A KR101454311B1 (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. |
| BE2006/0609 | 2006-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008070935A1 true WO2008070935A1 (en) | 2008-06-19 |
Family
ID=37964317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BE2007/000100 Ceased WO2008070935A1 (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 (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013144667A1 (en) * | 2012-03-28 | 2013-10-03 | Arcelormittal Investigacion Y Desarrollo Sl | Continuous casting equipment |
| RU2574149C1 (en) * | 2012-03-28 | 2016-02-10 | Арселормитталь Инвестигасьон И Десарролло Сл | Continuous casting facility |
| WO2024127248A1 (en) * | 2022-12-16 | 2024-06-20 | Arcelormittal | Continuous casting equipment |
| WO2024127076A1 (en) * | 2022-12-16 | 2024-06-20 | Arcelormittal | Continuous casting equipment |
| WO2024127075A1 (en) * | 2022-12-16 | 2024-06-20 | Arcelormittal | Continuous casting equipment |
| WO2024161262A1 (en) * | 2023-01-31 | 2024-08-08 | Arcelormittal | Continuous casting equipment |
| WO2024201333A1 (en) * | 2023-03-31 | 2024-10-03 | Arcelormittal | Continuous casting equipment |
| US12157165B2 (en) | 2012-03-28 | 2024-12-03 | Arcelormittal | Continuous casting process of metal |
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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 |
| 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 |
| 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 |
| 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 nozzles for continuous casting |
| WO2025093900A1 (en) * | 2023-10-30 | 2025-05-08 | Arcelormittal | Method of continuous casting of a composite metallic product |
| WO2025093902A1 (en) * | 2023-10-30 | 2025-05-08 | Arcelormittal | Method of continuous casting of a composite metallic product |
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- 2007-09-03 KR KR1020097012282A patent/KR101454311B1/en not_active Expired - Fee Related
- 2007-09-03 EP EP07800357A patent/EP2099576B8/en active Active
- 2007-09-03 PL PL07800357T patent/PL2099576T3/en unknown
- 2007-09-03 AT AT07800357T patent/ATE468188T1/en not_active IP Right Cessation
- 2007-09-03 ES ES07800357T patent/ES2343979T3/en active Active
- 2007-09-03 DE DE602007006689T patent/DE602007006689D1/en active Active
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|---|---|---|---|---|
| WO2013144667A1 (en) * | 2012-03-28 | 2013-10-03 | Arcelormittal Investigacion Y Desarrollo Sl | Continuous casting equipment |
| CN104220191A (en) * | 2012-03-28 | 2014-12-17 | 安赛乐米塔尔研发有限公司 | Continuous casting equipment |
| RU2574149C1 (en) * | 2012-03-28 | 2016-02-10 | Арселормитталь Инвестигасьон И Десарролло Сл | Continuous casting facility |
| CN104220191B (en) * | 2012-03-28 | 2016-04-06 | 安赛乐米塔尔研发有限公司 | Continuous Casting Equipment |
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| WO2024127285A1 (en) * | 2022-12-16 | 2024-06-20 | Arcelormittal | Continuous casting equipment |
| WO2024127248A1 (en) * | 2022-12-16 | 2024-06-20 | Arcelormittal | Continuous casting equipment |
| WO2024161262A1 (en) * | 2023-01-31 | 2024-08-08 | Arcelormittal | Continuous casting equipment |
| WO2024161178A1 (en) * | 2023-01-31 | 2024-08-08 | Arcelormittal | Continuous casting equipment |
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| WO2024201113A1 (en) * | 2023-03-31 | 2024-10-03 | Arcelormittal | Continuous casting equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0718348B1 (en) | 2016-03-29 |
| BRPI0718348A2 (en) | 2013-11-26 |
| DE602007006689D1 (en) | 2010-07-01 |
| EP2099576A1 (en) | 2009-09-16 |
| ATE468188T1 (en) | 2010-06-15 |
| BE1017392A3 (en) | 2008-08-05 |
| PL2099576T3 (en) | 2010-10-29 |
| EP2099576B1 (en) | 2010-05-19 |
| KR101454311B1 (en) | 2014-10-23 |
| SI2099576T1 (en) | 2010-08-31 |
| EP2099576B8 (en) | 2010-07-21 |
| KR20090095590A (en) | 2009-09-09 |
| ES2343979T3 (en) | 2010-08-13 |
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