EP0269180B1 - Device for casting pasty metals - Google Patents

Device for casting pasty metals Download PDF

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Publication number
EP0269180B1
EP0269180B1 EP87202263A EP87202263A EP0269180B1 EP 0269180 B1 EP0269180 B1 EP 0269180B1 EP 87202263 A EP87202263 A EP 87202263A EP 87202263 A EP87202263 A EP 87202263A EP 0269180 B1 EP0269180 B1 EP 0269180B1
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EP
European Patent Office
Prior art keywords
metal
casting
section
vertical pipe
inlet section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87202263A
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German (de)
French (fr)
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EP0269180A3 (en
EP0269180A2 (en
Inventor
Stéphan Wilmotte
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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Publication date
Priority claimed from LU86688A external-priority patent/LU86688A1/en
Priority claimed from LU86739A external-priority patent/LU86739A7/en
Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to AT87202263T priority Critical patent/ATE71004T1/en
Publication of EP0269180A2 publication Critical patent/EP0269180A2/en
Publication of EP0269180A3 publication Critical patent/EP0269180A3/en
Application granted granted Critical
Publication of EP0269180B1 publication Critical patent/EP0269180B1/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
    • 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
    • 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
    • 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means
    • 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
    • B22D41/62—Pouring-nozzles with stirring or vibrating means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S164/00—Metal founding
    • Y10S164/90—Rheo-casting

Definitions

  • the present invention relates to a device for casting a metal, particularly steel, in the pasty phase in a continuous casting ingot mold.
  • the objective of the present invention is to propose a particular device making it possible to create the conditions leading to the appearance of a pasty phase in the metal during its path between the ladle or the tundish on the one hand and the continuous casting ingot mold on the other hand.
  • the casting device according to the invention can therefore be used with a ladle or a casting basket fitted with a conventional nozzle.
  • a device for continuously casting a metal in the pasty phase in a continuous casting ingot mold comprising a vertical duct disposed upstream of said ingot mold with respect to the direction of circulation of said metal and externally provided with cooling means , is characterized in that said vertical duct comprises an inlet section whose at least the inner surface is made of a refractory material, in that a distributor member is arranged in said inlet section to deflect the metal coming from '' a pouring nozzle, located above said vertical duct, towards the interior surface of refractory material of said inlet section, in that it comprises means for forming a hollow jet of metal in said vertical duct below said member distributor and in that said cooling means extend only over the section of said vertical duct which is situated in front l with respect to said entry section.
  • the outlet end of this vertical duct is connected to the inlet end of said mold.
  • said vertical duct is extended by a tubular element penetrating into the mold.
  • the passage section of this tubular element is at least double the outlet section of the nozzle fitted to the ladle or the tundish. This increased section is intended to avoid clogging by the metal which, at this point, is in the pasty phase.
  • this duct comprises at least one frustoconical section, converging in the direction of circulation of the metal, the angle ⁇ of inclination of the wall of said section not being greater than 45 ° relative to the axis longitudinal of the duct and preferably being between 3 ° and 20 °.
  • the distributor member is constituted by a substantially horizontal plate; the thickness of said plate decreases from the center towards the edges; it has an external contour such that it provides at least one passage between the edge of the plate and the internal wall of the duct.
  • the casting device further comprises a cap mounted on the inlet end of said conduit and pierced with an opening intended to allow passage to the casting nozzle.
  • This cap delimits a chamber situated essentially above said distributor member and into which a protective gas can be introduced by appropriate means.
  • the device of the invention is part of an installation also comprising a ladle or a tundish fitted with a nozzle and a mold for continuous casting. It is mounted between on the one hand the ladle or the tundish and on the other hand the ingot mold, in such a way that said nozzle opens into the inlet end of the vertical duct, above the distributor member, and that the outlet end of the vertical conduit, respectively of the tubular element which extends it, opens into said ingot mold for continuous casting.
  • said vertical duct comprises an inlet section of which at least the interior surface is made of a refractory material, and said distributor member is disposed in this inlet section.
  • the metal flowing from the nozzle is deflected by the distributor member towards the refractory inner wall of said inlet section.
  • This wall does not suffer damage due to the heat flow applied by the metal. However, it can undergo mechanical degradation by erosion in the impact area of the metal.
  • this erosion phenomenon can be delayed by using a refractory material which has a high resistance to erosion by liquid metal.
  • Another means according to the invention for delaying the erosion of said refractory section consists in making the distributor member vertically displaceable in translation. It is thus possible to modify the vertical position of the distributor member with respect to the refractory inlet section, either between two successive casting operations, or possibly during a casting operation. This characteristic makes it possible to distribute the erosion over at least part of the axial length of said refractory inlet section and thus to prolong its service life.
  • the liquid metal deflected by the distributor member flows, without appreciable cooling, along the lower part of the refractory inlet section, then along the copper section where it undergoes the desired cooling.
  • said means for forming a hollow jet comprise means for blowing a gaseous agent inside said vertical duct, below the distributor member.
  • These means are advantageously constituted by at least one injector mounted on the underside of said distributor member and connected to an appropriate source of a gaseous agent, the latter preferably being an inert gas such as argon.
  • the gaseous agent thus injected makes it possible to re-establish the pressure under the distributor member and therefore ensures correct application of the thin layer of metal against the interior wall of the vertical duct.
  • an element of the vertical duct for example the inlet section made of refractory material or else the frustoconical element is provided with means intended to impart a rotational movement to the metal passing through said section.
  • FIG. 1 shows, in elevation, a pouring device according to the invention, mounted between a continuous casting ingot mold 1 and a ladle or a casting basket symbolized by the nozzle 2.
  • a tapered copper pipe 3 is mounted on the ingot mold 1; this duct is provided with water cooling shown diagrammatically by the arrows 4 and 5.
  • a distributor member in the form of a plate 6 whose thickness decreases from the center towards edges. The shape of this plate is adapted to that of the section of the conduit 3.
  • FIG. 2 shows a plate whose edge carries four projections ensuring the centering of the plate in the conduit, while peripheral passages are provided between the projections.
  • the conduit 3 is lined with a cap 7 delimiting a chamber 8 above the distributor plate 6.
  • This cap 7 is provided with an opening in which the nozzle 2 engages; the cap 7 is also provided with a system 9 for introducing a gas under pressure into the chamber 8.
  • a gas introduction system is well known per se and is not described in detail here.
  • FIG. 3 illustrates the variant of the device of the invention, in which the vertical duct 3 is extended by a tubular element 10 penetrating inside the ingot mold 1. If necessary, the lower end of this tubular element 10 can be immersed in the pasty metal found in the mold. For the rest, this variant corresponds entirely to the representation of FIG. 1.
  • FIG. 4 represents a casting device comprising a vertical duct 3 externally provided with a cooling circuit 4, 5, and a distributor member 6 disposed in this vertical duct.
  • the vertical duct 3 is extended by a tubular element 10 which enters a continuous casting mold 1, while the distributor member 6 is located below a nozzle 2 fitted to a casting container, not shown.
  • the vertical duct 3 comprises an inlet section 11 made of refractory material, inside of which is located the distributor member 6.
  • This is further provided with an injector 12 connected by a pipe 13 to a source of gaseous agent not shown.
  • the gaseous agent injected by the injector 12 forms inside the vertical pipe 3 a gas pocket which applies the thin layer of metal 14 against the interior surface of this vertical pipe.
  • the device shown in Figure 5 is basically similar to that of Figure 4. It differs only in that the inlet section 11 of refractory material has a greater axial length and that it is surrounded by inductors 15. These inductors generate a rotating electromagnetic field which puts the metal in rotation in the inlet section 11, which ensures good distribution of the liquid metal at the periphery of the inlet section. In addition, the resulting centrifugation effect is added to the action of the gaseous agent injected by the injector 12 to ensure the application of the thin layer of metal 14 against the interior wall of the inlet section. 11. The metal 14 is therefore rotated before entering the copper cooling section of the vertical pipe 3.
  • the mode of operation of this device is as follows.
  • the conduit 3 is mounted on the mold 1, then the distributor plate 6 and the cap 7 are in turn put in place.
  • the ladle or the tundish, not shown, is then brought into position so as to engage the nozzle 2 in the opening made in the cap 7.
  • the liquid steel thus flows in a thin layer spreading over the interior wall of the conduit 3.
  • the cooling of the conduit ensures the elimination of the overheating of the steel and causes the appearance of a solid fraction which makes the pasty steel at its entry into the ingot mold 1.
  • a pressurized protective gas for example argon
  • the pipe was cooled by water circulating at high speed ensuring an average density of cooling flow of 3 MW / m2.
  • the evacuated heat flow amounted to 72 MW and led to a solid fraction of 38% by volume in the steel entering the ingot mold.
  • the device of the invention has a large heat exchange surface between the cooled pipe and the liquid steel; the high flow speed of the latter along the wall of the duct makes it possible to achieve a high density of heat flow. He would not go out moreover, it is not within the scope of the invention to increase this density of flux by imparting to the conduit a rotational movement around its axis.
  • the device of the invention is simple, compact and robust. It has great operational safety, in particular due to a very low risk of blockage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Die Bonding (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A device for casting a metal in the pasty phase in a continuous casting mold comprises a vertical conduit disposed upstream of the mold and provided externally with cooling means a distributor member disposed substantially at the inlet of the conduit to deflect the metal flowing from a casting nozzle towards the inner surface of the vertical conduit which may be extended by a tubular element penetrating into the mold and an inlet section for the conduit at least the inner surface of which is formed by refractory material, the distributor member being disposed in the inlet section. The device may have an injector for injecting a gaseous agent into the vertical conduit below the distributor member, and a further device for causing the metal to rotate in the inlet section.

Description

La présente invention porte sur un dispositif de coulée d'un métal, particulièrement de l'acier, en phase pâteuse dans une lingotière de coulée continue.The present invention relates to a device for casting a metal, particularly steel, in the pasty phase in a continuous casting ingot mold.

On connaît déjà l'intérêt du procédé de coulée en phase pâteuse, c'est-à-dire à une température comprise dans l'intervalle de solidification du métal considéré, pour la coulée continue de métaux, tels que l'acier. Ce procédé permet en effet d'obtenir des structures fines et homogènes qui réduisent les ségrégations dans les produits coulés.The advantage of the pasty phase casting process, that is to say at a temperature within the solidification range of the metal considered, is already known for the continuous casting of metals, such as steel. This process makes it possible to obtain fine and homogeneous structures which reduce segregation in the cast products.

Un procédé de ce type est connu notamment par le brevet DE-A-2707774.A process of this type is known in particular from patent DE-A-2707774.

L'objectif de la présente invention est de proposer un dispositif particulier permettant de créer les conditions conduisant à l'apparition d'une phase pâteuse dans le métal au cours de son trajet entre la poche ou le panier de coulée d'une part et la lingotière de coulée continue d'autre part. Le dispositif de coulée suivant l'invention peut dès lors être utilisé avec une poche ou un panier de coulée équipé d'une busette classique.The objective of the present invention is to propose a particular device making it possible to create the conditions leading to the appearance of a pasty phase in the metal during its path between the ladle or the tundish on the one hand and the continuous casting ingot mold on the other hand. The casting device according to the invention can therefore be used with a ladle or a casting basket fitted with a conventional nozzle.

Conformément à la présente invention, un dispositif de coulée continue d'un métal en phase pâteuse dans une lingotière de coulée continue, comprenant un conduit vertical disposé en amont de ladite lingotière par rapport au sens de circulation dudit métal et extérieurement pourvu de moyens de refroidissement, est caractérisé en ce que ledit conduit vertical comporte un tronçon d'entrée dont au moins la surface intérieure est constituée d'un matériau réfractaire, en ce qu'un organe répartiteur est disposé dans ledit tronçon d'entrée pour dévier le métal provenant d'une busette de coulée, située au-dessus dudit conduit vertical, vers la surface intérieure en matériau réfractaire dudit tronçon d'entrée, en ce qu'il comporte des moyens pour former un jet creux de métal dans ledit conduit vertical en dessous dudit organe répartiteur et en ce que lesdits moyens de refroidissement ne s'étendent que sur le tronçon dudit conduit vertical qui est situé en aval par rapport audit tronçon d'entrée.According to the present invention, a device for continuously casting a metal in the pasty phase in a continuous casting ingot mold, comprising a vertical duct disposed upstream of said ingot mold with respect to the direction of circulation of said metal and externally provided with cooling means , is characterized in that said vertical duct comprises an inlet section whose at least the inner surface is made of a refractory material, in that a distributor member is arranged in said inlet section to deflect the metal coming from '' a pouring nozzle, located above said vertical duct, towards the interior surface of refractory material of said inlet section, in that it comprises means for forming a hollow jet of metal in said vertical duct below said member distributor and in that said cooling means extend only over the section of said vertical duct which is situated in front l with respect to said entry section.

Selon une réalisation particulière du dispositif de l'invention, l'extrémité de sortie de ce conduit vertical se raccorde à l'extrémité d'entrée de ladite lingotière.According to a particular embodiment of the device of the invention, the outlet end of this vertical duct is connected to the inlet end of said mold.

Selon une autre réalisation du dispositif de l'invention, ledit conduit vertical se prolonge par un élément tubulaire pénétrant dans la lingotière.According to another embodiment of the device of the invention, said vertical duct is extended by a tubular element penetrating into the mold.

Dans ce cas, la section de passage de cet élément tubulaire est au moins double de la section de sortie de la busette équipant la poche ou le panier de coulée. Cette section accrue est destinée à éviter le bouchage par le métal qui, à cet endroit, se trouve en phase pâteuse.In this case, the passage section of this tubular element is at least double the outlet section of the nozzle fitted to the ladle or the tundish. This increased section is intended to avoid clogging by the metal which, at this point, is in the pasty phase.

Egalement selon l'invention, ce conduit comprend au moins un tronçon tronconique, convergent dans le sens de circulation du métal, l'angle α d'inclinaison de la paroi dudit tronçon n'étant pas supérieur à 45° par rapport à l'axe longitudinal du conduit et étant de préférence compris entre 3° et 20°.Also according to the invention, this duct comprises at least one frustoconical section, converging in the direction of circulation of the metal, the angle α of inclination of the wall of said section not being greater than 45 ° relative to the axis longitudinal of the duct and preferably being between 3 ° and 20 °.

Selon une autre caractéristique de l'invention l'organe répartiteur est constitué par un plateau sensiblement horizontal; l'épaisseur dudit plateau diminue du centre vers les bords; il présente un contour extérieur tel qu'il ménage au moins un passage entre le bord du plateau et la paroi intérieure du conduit.According to another characteristic of the invention, the distributor member is constituted by a substantially horizontal plate; the thickness of said plate decreases from the center towards the edges; it has an external contour such that it provides at least one passage between the edge of the plate and the internal wall of the duct.

Toujours selon l'invention, le dispositif de coulée comporte en outre une coiffe montée sur l'extrémité d'entrée dudit conduit et percée d'une ouverture destinée à livrer passage à la busette de coulée. Cette coiffe délimite une chambre située essentiellement au-dessus dudit organe répartiteur et dans laquelle on peut introduire un gaz protecteur par des moyens appropriés.Still according to the invention, the casting device further comprises a cap mounted on the inlet end of said conduit and pierced with an opening intended to allow passage to the casting nozzle. This cap delimits a chamber situated essentially above said distributor member and into which a protective gas can be introduced by appropriate means.

En service, le dispositif de l'invention fait partie d'une installation comprenant également une poche ou un panier de coulée équipé d'une busette et d'une lingotière de coulée continue. Il est monté entre d'une part la poche ou le panier de coulée et d'autre part la lingotière, de telle façon que ladite busette débouche dans l'extrémité d'entrée du conduit vertical, au-dessus de l'organe répartiteur, et que l'extrémité de sortie du conduit vertical, respectivement de l'élément tubulaire qui le prolonge, débouche dans ladite lingotière de coulée continue.In service, the device of the invention is part of an installation also comprising a ladle or a tundish fitted with a nozzle and a mold for continuous casting. It is mounted between on the one hand the ladle or the tundish and on the other hand the ingot mold, in such a way that said nozzle opens into the inlet end of the vertical duct, above the distributor member, and that the outlet end of the vertical conduit, respectively of the tubular element which extends it, opens into said ingot mold for continuous casting.

Suivant une modalité avantageuse de réalisation du dispositif de l'invention, ledit conduit vertical comporte un tronçon d'entrée dont au moins la surface intérieure est constituée d'un matériau réfractaire, et ledit organe répartiteur est disposé dans ce tronçon d'entrée.According to an advantageous embodiment of the device of the invention, said vertical duct comprises an inlet section of which at least the interior surface is made of a refractory material, and said distributor member is disposed in this inlet section.

Grâce à la constitution particulière du dispositif de l'invention, le métal s'écoulant de la busette est dévié par l'organe répartiteur vers la paroi intérieure réfractaire dudit tronçon d'entrée. Cette paroi ne subit pas de dommage dû au flux de chaleur appliqué par le métal. Elle peut cependant subir une dégradation mécanique par érosion dans la zone d'impact du métal.Thanks to the particular constitution of the device of the invention, the metal flowing from the nozzle is deflected by the distributor member towards the refractory inner wall of said inlet section. This wall does not suffer damage due to the heat flow applied by the metal. However, it can undergo mechanical degradation by erosion in the impact area of the metal.

Dans le cadre de la présente invention, ce phénomène d'érosion peut être retardé en utilisant un matériau réfractaire qui présente une résistance élevée à l'érosion par le métal liquide.In the context of the present invention, this erosion phenomenon can be delayed by using a refractory material which has a high resistance to erosion by liquid metal.

Un autre moyen conforme à l'invention pour retarder l'érosion dudit tronçon réfractaire consiste à rendre l'organe répartiteur déplaçable verticalement en translation. Il est ainsi possible de modifier la position verticale de l'organe répartiteur par rapport au tronçon d'entrée réfractaire, soit entre deux opérations de coulée successives, soit éventuellement au cours d'une opération de coulée. Cette caractéristique permet de répartir l'érosion sur au moins une partie de la longueur axiale dudit tronçon d'entrée réfractaire et d'en prolonger ainsi la durée de vie.Another means according to the invention for delaying the erosion of said refractory section consists in making the distributor member vertically displaceable in translation. It is thus possible to modify the vertical position of the distributor member with respect to the refractory inlet section, either between two successive casting operations, or possibly during a casting operation. This characteristic makes it possible to distribute the erosion over at least part of the axial length of said refractory inlet section and thus to prolong its service life.

Dans tous les cas, le métal liquide dévié par l'organe répartiteur s'écoule, sans refroidissement sensible, le long de la partie inférieure du tronçon d'entrée réfractaire, puis le long du tronçon en cuivre où il subit le refroidissement désiré.In all cases, the liquid metal deflected by the distributor member flows, without appreciable cooling, along the lower part of the refractory inlet section, then along the copper section where it undergoes the desired cooling.

Selon une particularité intéressante, lesdits moyens pour former un jet creux comprennent des moyens pour insuffler un agent gazeux à l'intérieur dudit conduit vertical, en dessous de l'organe répartiteur.According to an interesting feature, said means for forming a hollow jet comprise means for blowing a gaseous agent inside said vertical duct, below the distributor member.

Ces moyens sont avantageusement constitués par au moins un injecteur monté sur la face inférieure dudit organe répartiteur et raccordé à une source appropriée d'un agent gazeux, celui-ci étant de préférence un gaz inerte tel que l'argon.These means are advantageously constituted by at least one injector mounted on the underside of said distributor member and connected to an appropriate source of a gaseous agent, the latter preferably being an inert gas such as argon.

L'agent gazeux ainsi insufflé permet de rétablir la pression sous l'organe répartiteur et assure dès lors une application correcte de la couche mince de métal contre la paroi intérieure du conduit vertical.The gaseous agent thus injected makes it possible to re-establish the pressure under the distributor member and therefore ensures correct application of the thin layer of metal against the interior wall of the vertical duct.

Selon une autre particularité intéressante, un élément du conduit vertical, par exemple le tronçon d'entrée en matériau réfractaire ou encore l'élément tronconique est pourvu de moyens destinés à imprimer un mouvement de rotation au métal traversant ledit tronçon.According to another interesting feature, an element of the vertical duct, for example the inlet section made of refractory material or else the frustoconical element is provided with means intended to impart a rotational movement to the metal passing through said section.

Ces moyens sont avantageusement constitués par des inducteurs engendrant un champ électromagnétique tournant.These means are advantageously constituted by inductors generating a rotating electromagnetic field.

L'objet de l'invention sera mieux compris à l'aide de la description qui suit d'une réalisation préférée du dispositif de l'invention, avec référence aux dessins annexés dans lesquels la

Figure 1
représente une vue en élévation d'un dispositif de coulée en coupe transversale suivant la ligne I-I de la figure 2; la
Figure 2
montre une vue en plan, coiffe enlevée, du dispositif de coulée de la figure 1; la
Figure 3
illustre la variante dans laquelle le conduit vertical se prolonge par un élément tubulaire pénétrant dans la lingotière de coulée continue; la
Figure 4
représente un dispositif comportant un tronçon d'entrée en matériau réfractaire, ainsi qu'un système d'insufflation d'un agent gazeux; et la
Figure 5
illustre un dispositif analogue à celui de la figure 4 et comportant en outre des inducteurs disposés autour du tronçon d'entrée.
The object of the invention will be better understood with the aid of the description which follows of a preferred embodiment of the device of the invention, with reference to the appended drawings in which the
Figure 1
shows an elevational view of a casting device in cross section along line II of Figure 2; the
Figure 2
shows a plan view, cap removed, of the casting device of Figure 1; the
Figure 3
illustrates the variant in which the vertical duct is extended by a tubular element penetrating into the mold for continuous casting; the
Figure 4
shows a device comprising an inlet section made of refractory material, as well as a system for blowing a gaseous agent; and the
Figure 5
illustrates a device similar to that of Figure 4 and further comprising inductors arranged around the inlet section.

Dans ces figures, les éléments analogues sont désignés par les mêmes repères numériques.In these figures, similar elements are designated by the same reference numerals.

La figure 1 montre, en élévation, un dispositif de coulée conforme à l'invention, monté entre une lingotière de coulée continue 1 et une poche ou un panier de coulée symbolisé par la busette 2. Un conduit tronconique 3 en cuivre est monté sur la lingotière 1; ce conduit est pourvu d'un refroidissement à l'eau schématisé par les flèches 4 et 5. A l'extrémité supérieure de ce conduit 3 est disposé un organe répartiteur sous la forme d'un plateau 6 dont l'épaisseur décroît du centre vers les bords. La forme de ce plateau est adaptée à celle de la section du conduit 3. La figure 2 montre un plateau dont le bord porte quatre saillies assurant le centrage du plateau dans le conduit, tandis que des passages périphériques sont prévus entre les saillies.FIG. 1 shows, in elevation, a pouring device according to the invention, mounted between a continuous casting ingot mold 1 and a ladle or a casting basket symbolized by the nozzle 2. A tapered copper pipe 3 is mounted on the ingot mold 1; this duct is provided with water cooling shown diagrammatically by the arrows 4 and 5. At the upper end of this duct 3 is arranged a distributor member in the form of a plate 6 whose thickness decreases from the center towards edges. The shape of this plate is adapted to that of the section of the conduit 3. FIG. 2 shows a plate whose edge carries four projections ensuring the centering of the plate in the conduit, while peripheral passages are provided between the projections.

Revenant à la figure 1, le conduit 3 est garni d'une coiffe 7 délimitant une chambre 8 au-dessus du plateau répartiteur 6. Cette coiffe 7 est dotée d'une ouverture dans laquelle s'engage la busette 2; la coiffe 7 est également pourvue d'un système 9 d'introduction d'un gaz sous pression dans la chambre 8. Un tel système d'introduction de gaz est bien connu en soi et n'est pas décrit en détail ici.Returning to FIG. 1, the conduit 3 is lined with a cap 7 delimiting a chamber 8 above the distributor plate 6. This cap 7 is provided with an opening in which the nozzle 2 engages; the cap 7 is also provided with a system 9 for introducing a gas under pressure into the chamber 8. Such a gas introduction system is well known per se and is not described in detail here.

La figure 3 illustre la variante du dispositif de l'invention,dans laquelle le conduit vertical 3 se prolonge par un élément tubulaire 10 pénétrant à l'intérieur de la lingotière 1. Le cas échéant, l'extrémité inférieure de cet élément tubulaire 10 peut être immergée dans le métal pâteux qui se trouve dans la lingotière. Pour le reste, cette variante correspond entièrement à la représentation de la figure 1.FIG. 3 illustrates the variant of the device of the invention, in which the vertical duct 3 is extended by a tubular element 10 penetrating inside the ingot mold 1. If necessary, the lower end of this tubular element 10 can be immersed in the pasty metal found in the mold. For the rest, this variant corresponds entirely to the representation of FIG. 1.

La figure 4 représente un dispositif de coulée comportant un conduit vertical 3 extérieurement pourvu d'un circuit de refroidissement 4, 5, et un organe répartiteur 6 disposé dans ce conduit vertical.FIG. 4 represents a casting device comprising a vertical duct 3 externally provided with a cooling circuit 4, 5, and a distributor member 6 disposed in this vertical duct.

Le conduit vertical 3 se prolonge par un élément tubulaire 10 qui pénètre dans une lingotière de coulée continue 1, tandis que l'organe répartiteur 6 est situé en dessous d'une busette 2 équipant un récipient de coulée non représenté. Le conduit vertical 3 comporte un tronçon d'entrée 11 en matériau réfractaire, à l'intérieur duquel est situé l'organe répartiteur 6. Celui-ci est en outre pourvu d'un injecteur 12 relié par une canalisation 13 à une source d'agent gazeux non représentée. L'agent gazeux insufflé par l'injecteur 12 forme à l'intérieur du conduit vertical 3 une poche de gaz qui applique la mince couche de métal 14 contre la surface intérieure de ce conduit vertical.The vertical duct 3 is extended by a tubular element 10 which enters a continuous casting mold 1, while the distributor member 6 is located below a nozzle 2 fitted to a casting container, not shown. The vertical duct 3 comprises an inlet section 11 made of refractory material, inside of which is located the distributor member 6. This is further provided with an injector 12 connected by a pipe 13 to a source of gaseous agent not shown. The gaseous agent injected by the injector 12 forms inside the vertical pipe 3 a gas pocket which applies the thin layer of metal 14 against the interior surface of this vertical pipe.

Le dispositif représenté dans la figure 5 est fondamentalement similaire à celui de la figure 4. Il s'en distingue uniquement par le fait que le tronçon d'entrée 11 en matériau réfractaire présente une plus grande longueur axiale et qu'il est entouré d'inducteurs 15. Ces inducteurs engendrent un champ électromagnétique tournant qui met le métal en rotation dans le tronçon d'entrée 11, ce qui assure une bonne répartition du métal liquide à la périphérie du tronçon d'entrée. De plus, l'effet de centrifugation qui en résulte s'ajoute à l'action de l'agent gazeux insufflé par l'injecteur 12 pour assurer l'application de la mince couche de métal 14 contre la paroi intérieure du tronçon d'entrée 11. Le métal 14 est donc mis en rotation avant de pénétrer dans le tronçon refroidissant en cuivre du conduit vertical 3.The device shown in Figure 5 is basically similar to that of Figure 4. It differs only in that the inlet section 11 of refractory material has a greater axial length and that it is surrounded by inductors 15. These inductors generate a rotating electromagnetic field which puts the metal in rotation in the inlet section 11, which ensures good distribution of the liquid metal at the periphery of the inlet section. In addition, the resulting centrifugation effect is added to the action of the gaseous agent injected by the injector 12 to ensure the application of the thin layer of metal 14 against the interior wall of the inlet section. 11. The metal 14 is therefore rotated before entering the copper cooling section of the vertical pipe 3.

Le mode de fonctionnement de ce dispositif est le suivant.The mode of operation of this device is as follows.

Le conduit 3 est monté sur la lingotière 1, puis le plateau répartiteur 6 et la coiffe 7 sont à leur tour mis en place. La poche ou le panier de coulée, non représenté, est alors amené en position de façon à engager la busette 2 dans l'ouverture ménagée dans la coiffe 7. On ouvre la busette 2 et l'acier liquide surchauffé s'écoule à travers celle-ci sur le plateau répartiteur 6. En raison de l'inclinaison de la surface supérieure du plateau 6, l'acier s'écoule vers la périphérie du plateau 6, puis à travers les passages ménagés entre les saillies de centrage du plateau.The conduit 3 is mounted on the mold 1, then the distributor plate 6 and the cap 7 are in turn put in place. The ladle or the tundish, not shown, is then brought into position so as to engage the nozzle 2 in the opening made in the cap 7. On opens the nozzle 2 and the superheated liquid steel flows through it on the distributor plate 6. Due to the inclination of the upper surface of the plate 6, the steel flows towards the periphery of the plate 6 , then through the passages made between the plate centering projections.

L'acier liquide ruisselle ainsi en une couche mince en s'étalant sur la paroi intérieure du conduit 3. Le refroidissement du conduit assure l'élimination de la surchauffe de l'acier et provoque l'apparition d'une fraction solide qui rend l'acier pâteux à son entrée dans la lingotière 1. L'introduction d'un gaz protecteur sous pression, par exemple de l'argon, dans la chambre 8 provoque une surpression dans cette chambre et empêche toute entrée d'air au contact de l'acier liquide.The liquid steel thus flows in a thin layer spreading over the interior wall of the conduit 3. The cooling of the conduit ensures the elimination of the overheating of the steel and causes the appearance of a solid fraction which makes the pasty steel at its entry into the ingot mold 1. The introduction of a pressurized protective gas, for example argon, into the chamber 8 causes an overpressure in this chamber and prevents any entry of air in contact with the liquid steel.

A titre d'exemple, on a coulé des blooms d'une section de 220 mm × 220 mm, en acier contenant 0,7 % C, avec un débit de 20 t/h. La surchauffe initiale de l'acier était de 25°C; la température de l'acier dans la busette était de 1505°C. L'acier a été coulé sur un plateau répartiteur en matériau réfractaire, sous une protection d'argon, puis le long des parois intérieures du conduit 3. Celui-ci était constitué par un conduit tronconique en cuivre, d'une longueur de 350 mm et d'un diamètre de 220 mm à mi-longueur; l'angle d'inclinaison α de la paroi du tronc de cône était de 5° par rapport à la verticale.By way of example, blooms of a section of 220 mm × 220 mm, of steel containing 0.7% C, were poured with a flow rate of 20 t / h. The initial superheat of the steel was 25 ° C; the temperature of the steel in the nozzle was 1505 ° C. The steel was poured on a distributor plate made of refractory material, under an argon protection, then along the inner walls of the conduit 3. This was constituted by a frustoconical copper conduit, with a length of 350 mm and with a diameter of 220 mm at mid-length; the angle of inclination α of the wall of the truncated cone was 5 ° relative to the vertical.

Le conduit était refroidi par de l'eau circulant à grande vitesse assurant une densité moyenne de flux de refroidissement de 3 MW/m². Le flux de chaleur évacué s'élevait à 72 MW et a conduit à une fraction solide de 38 % en volume dans l'acier entrant dans la lingotière.The pipe was cooled by water circulating at high speed ensuring an average density of cooling flow of 3 MW / m². The evacuated heat flow amounted to 72 MW and led to a solid fraction of 38% by volume in the steel entering the ingot mold.

Le dispositif de l'invention présente une grande surface d'échange thermique entre le conduit refroidi et l'acier liquide; la vitesse d'écoulement élevée de ce dernier le long de la paroi du conduit, permet d'atteindre une densité de flux de chaleur élevée. Il ne sortirait d'ailleurs pas du cadre de l'invention d'accroître cette densité de flux en imprimant au conduit un mouvement de rotation autour de son axe.The device of the invention has a large heat exchange surface between the cooled pipe and the liquid steel; the high flow speed of the latter along the wall of the duct makes it possible to achieve a high density of heat flow. He would not go out moreover, it is not within the scope of the invention to increase this density of flux by imparting to the conduit a rotational movement around its axis.

Le dispositif de l'invention est simple, compact et robuste. Il présente une grande sécurité de fonctionnement, notamment en raison d'un très faible risque de bouchage.The device of the invention is simple, compact and robust. It has great operational safety, in particular due to a very low risk of blockage.

Claims (9)

  1. Device for continuous casting of a metal in viscous phase in a continuous casting ingot mould, comprising a vertical pipe arranged upstream of the said ingot mould relative to the direction of circulation of the said metal and provided on the outside with cooling means, characterised in that the said vertical pipe (3) comprises an inlet section (11), of which at least the inner surface is made of a refractory material, in that a distributing element (6) is arranged in the said inlet section (11) to deflect the metal issuing from a casting nozzle, located above the said vertical pipe, towards the inner surface of refractory material of the said inlet section (11), in that it comprises means for forming a hollow stream of metal in the said vertical pipe (3) and below the said distributing element (6) and in that the said cooling means (4, 5) extend only over the section of the said vertical pipe which is located downstream relative to the said inlet section (11).
  2. Casting device according to Claim 1, characterised in that the said vertical pipe is extended by a tubular element (10) penetrating into the ingot mould.
  3. Casting device according to either of Claims 1 and 2, characterised in that the said pipe comprises at least one section (3) in the form of a truncated cone convergent in the direction of circulation of the metal, the angle α of the wall of the said section not being greater than 45° relative to the longitudinal axis of the pipe and preferably being between 3° and 20°.
  4. Casting device according to either of Claims 1 to 3, characterised in that the distributing element consists of an essentially horizontal plate, the said plate having a thickness decreasing from the centre towards the edges and a shape such that it secures at least one passage between the edge of the plate and the inner wall of the pipe.
  5. Casting device according to either of Claims 1 to 4, characterised in that it comprises a cap (7) mounted on the inlet end of the said pipe and provided with an opening intended to provide passage for the casting nozzle.
  6. Device according to either of Claims 1 to 5, characterised in that the said distributing element (6) is capable of undergoing translational movement in the said inlet section (11).
  7. Device according to either of Claims 1 to 6, characterised in that the said means for forming a hollow stream comprise means (12, 13) for blowing a gaseous agent into the interior of the said vertical pipe (3), below the said distributing element (6).
  8. Device according to either of Claims 1 to 7, characterised in that an element of the vertical pipe is provided with means intended to impart a rotary movement to the metal passing through the said section.
  9. Device according to Claim 8, characterised in that the said means consist of inductors giving rise to a rotary electromagnetic field.
EP87202263A 1986-11-26 1987-11-19 Device for casting pasty metals Expired - Lifetime EP0269180B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87202263T ATE71004T1 (en) 1986-11-26 1987-11-19 DEVICE FOR CASTING A PASTE METAL.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
LU86688 1986-11-26
LU86688A LU86688A1 (en) 1986-11-26 1986-11-26 Device for casting metal esp. steel, in a pasty phase - in a continuous casting installation
LU86739A LU86739A7 (en) 1987-01-16 1987-01-16 Device for casting metal esp. steel, in a pasty phase - in a continuous casting installation
LU86739 1987-01-16

Publications (3)

Publication Number Publication Date
EP0269180A2 EP0269180A2 (en) 1988-06-01
EP0269180A3 EP0269180A3 (en) 1988-08-10
EP0269180B1 true EP0269180B1 (en) 1992-01-02

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EP87202263A Expired - Lifetime EP0269180B1 (en) 1986-11-26 1987-11-19 Device for casting pasty metals

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US (1) US4874471A (en)
EP (1) EP0269180B1 (en)
JP (1) JPH0815638B2 (en)
AT (1) ATE71004T1 (en)
DE (1) DE3775722D1 (en)
ES (1) ES2029268T3 (en)

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EP0327526A1 (en) * 1988-02-03 1989-08-09 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Device for cooling a metal during casting
EP0452294A2 (en) * 1990-04-11 1991-10-16 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method and device for the continuous casting of a metal
EP0455619A1 (en) * 1990-05-04 1991-11-06 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif A device for metal casting and a method of operating such device
EP0492761A1 (en) * 1990-12-28 1992-07-01 Rheo-Technology, Ltd Method and apparatus for the production of semi-solidified metal composition
EP0527717A1 (en) * 1991-08-12 1993-02-17 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method and device for continuous casting a molten metal
EP0657235A1 (en) * 1993-12-08 1995-06-14 Rheo-Technology, Ltd Process for the production of semi-solidified metal composition
WO2013144668A1 (en) 2012-03-28 2013-10-03 Arcelormittal Investigacion Y Desarrollo Sl Continuous casting process of metal

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BE1006567A6 (en) * 1992-12-28 1994-10-18 Centre Rech Metallurgique Casting process of metal phase pasty.
US5963336A (en) 1995-10-10 1999-10-05 American Air Liquide Inc. Chamber effluent monitoring system and semiconductor processing system comprising absorption spectroscopy measurement system, and methods of use
US5881796A (en) * 1996-10-04 1999-03-16 Semi-Solid Technologies Inc. Apparatus and method for integrated semi-solid material production and casting
US5887640A (en) * 1996-10-04 1999-03-30 Semi-Solid Technologies Inc. Apparatus and method for semi-solid material production
BE1012037A3 (en) * 1998-06-11 2000-04-04 Centre Rech Metallurgique Nozzle for continuous pouring of steel
CA2338004A1 (en) 1998-07-24 2000-02-03 Charles E. Barron Semi-solid casting apparatus and method
GB2347886A (en) * 1999-03-17 2000-09-20 British Steel Plc Apparatus for removing superheat from liquid metal using a distributor
BE1013745A3 (en) 2000-10-10 2002-07-02 Ct De Rech S Metallurg Ass San Method and device for casting continuous steel chemical composition a mixed.
BE1014063A3 (en) * 2001-03-22 2003-03-04 Ct De Rech S Metallurg Ass San Continuous casting of steel with uniformly distributed fine oxides involves injecting a finely divided metallic material into the steel as it passes from the distributor into the casting mold
BE1014278A3 (en) * 2001-07-05 2003-07-01 Ct Rech Metallurgiques Asbl Casting method for improved quality metal slug and device for its implementation.
US6964199B2 (en) * 2001-11-02 2005-11-15 Cantocor, Inc. Methods and compositions for enhanced protein expression and/or growth of cultured cells using co-transcription of a Bcl2 encoding nucleic acid
US20050126737A1 (en) * 2003-12-04 2005-06-16 Yurko James A. Process for casting a semi-solid metal alloy
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
BE1017392A3 (en) * 2006-12-12 2008-08-05 Ct Rech Metallurgiques Asbl HOLLOW JET BUSHET FOR CONTINUOUS STEEL CASTING.
EP2047926A1 (en) 2007-10-10 2009-04-15 Ugine & Alz France Method of manufacturing stainless steels comprising fine carbonitrides, and product obtained from this method
CN101462154B (en) * 2008-11-28 2011-05-18 苏州明志科技有限公司 Water-cooling injection nozzle structure for plug-in hot box
HUE049749T2 (en) * 2012-03-28 2020-10-28 Arcelormittal Continuous casting equipment
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US9616494B2 (en) * 2014-03-28 2017-04-11 Scott Vader Conductive liquid three dimensional printer

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
EP0327526A1 (en) * 1988-02-03 1989-08-09 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Device for cooling a metal during casting
EP0452294A2 (en) * 1990-04-11 1991-10-16 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method and device for the continuous casting of a metal
EP0455619A1 (en) * 1990-05-04 1991-11-06 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif A device for metal casting and a method of operating such device
EP0492761A1 (en) * 1990-12-28 1992-07-01 Rheo-Technology, Ltd Method and apparatus for the production of semi-solidified metal composition
EP0527717A1 (en) * 1991-08-12 1993-02-17 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method and device for continuous casting a molten metal
BE1005165A3 (en) * 1991-08-12 1993-05-11 Centre Rech Metallurgique Method and device for the continuous casting of metal fusion.
EP0657235A1 (en) * 1993-12-08 1995-06-14 Rheo-Technology, Ltd Process for the production of semi-solidified metal composition
US5555926A (en) * 1993-12-08 1996-09-17 Rheo-Technology, Ltd. Process for the production of semi-solidified metal composition
WO2013144668A1 (en) 2012-03-28 2013-10-03 Arcelormittal Investigacion Y Desarrollo Sl Continuous casting process of metal

Also Published As

Publication number Publication date
US4874471A (en) 1989-10-17
ES2029268T3 (en) 1992-08-01
DE3775722D1 (en) 1992-02-13
JPS63199056A (en) 1988-08-17
EP0269180A3 (en) 1988-08-10
JPH0815638B2 (en) 1996-02-21
EP0269180A2 (en) 1988-06-01
ATE71004T1 (en) 1992-01-15

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