EP0508246B1 - Stopper rod having an erosion-resistant sleeve - Google Patents

Stopper rod having an erosion-resistant sleeve Download PDF

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Publication number
EP0508246B1
EP0508246B1 EP92105388A EP92105388A EP0508246B1 EP 0508246 B1 EP0508246 B1 EP 0508246B1 EP 92105388 A EP92105388 A EP 92105388A EP 92105388 A EP92105388 A EP 92105388A EP 0508246 B1 EP0508246 B1 EP 0508246B1
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EP
European Patent Office
Prior art keywords
stopper rod
sleeve
erosion
stopper
rod according
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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
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EP92105388A
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German (de)
French (fr)
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EP0508246A1 (en
Inventor
Aldo Ruffaldi
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Vesuvius France SA
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Vesuvius France SA
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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
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor

Definitions

  • the continuous casting process of steel is currently mainly used in the steel industry.
  • the liquid steel, at its outlet from the converter is poured into a large capacity pocket, then poured into a smaller capacity distributor which allows it to be continuously cast in one or more molds.
  • a stopper is an elongated piece of refractory material that dips into liquid steel. Its lower end is applied to the seat of a tap hole provided in the bottom of the distributor. An arm fixed at its upper part makes it possible to move its lower end more or less away from the seat of the tap hole and thus to regulate or stop the flow of the metal.
  • Rotary devices are also known in which the flow of metal is controlled by rotation.
  • the free surface of the molten metal contained both in the pocket and in the distributor is covered with a covering powder, generally of a synthetic nature.
  • This powder has several functions. It prevents oxidation of the metal by isolating it from the ambient air, reduces heat losses, and traps inclusions which rise to the surface of the steel.
  • This slag also has a corrosive action on the distaff.
  • the combined erosion of the slag and the covering powder causes the appearance of a weakening of the section of the stopper rod at its level of immersion in the liquid metal. This reduction in section weakens the stopper rod and can cause it to break. Such a rupture leads to the loss of control over the flow of the metal. All of the metal contained in the distributor is then lost and can cause considerable damage to the continuous casting mold and to the entire installation. This also involves considerable risks for personnel in the vicinity of the dispatcher. It is therefore absolutely essential to avoid any risk of the stopper breaking.
  • Documents FR-A-2 467 769 and JP-A-63 104 760 describe nozzles for the continuous casting of steel comprising erosion-resistant sleeves arranged in a fixed position relative to the level of the steel in the mold.
  • Document JP-A 113 0857 describes a stopper comprising a cuff made essentially of silica and disposed over the entire height of the stopper to prevent the alumina forming the stopper from dissolving in the steel.
  • the present invention relates to a stopper rod which overcomes these drawbacks. It has increased resistance to erosion from both slag and covering powder. It therefore allows a longer casting sequence without risk of breakage. It also applies to rotary mechanisms (rotary valves).
  • This stopper has an elongated body obtained by isostatic pressing of a first material, to regulate the flow of liquid steel from a distributor containing a substantially constant amount of liquid steel to a continuous casting mold, a layer of cover powder floating on the surface of the liquid steel.
  • It is characterized in that it comprises an erosion-resistant cuff surrounding the body, extending over only part of the height of the body, and situated in the longitudinal direction of the stopper rod at a height such that, when the the stopper rod is in operation, the cuff is at the level of the stopper immersion line, the cuff having a height sufficient to take account of slight variations in height at the steel level as well as the movements of the stopper rod at the during its operation, said sleeve being made of a second material having high characteristics of resistance to erosion by the covering powder.
  • the material having particularly high characteristics of resistance to erosion can be chosen from the group comprising zirconia, magnesia, graphitized zirconia, graphitized magnesia.
  • the stopper of the invention comprises an elongated body having an extra thickness.
  • This extra thickness can be constituted by the material of the body itself.
  • the stopper rod is made of a single material.
  • the additional thickness may be constituted, at least in part, by a cuff made of a second material different from that of the body.
  • this second material has high characteristics of resistance to erosion by the slag and the covering powder.
  • the cuff can be made in one piece and fixed or cemented on the surface outside of the body. It can also be made in two or more parts, which then makes it possible to insert it into a recess made in the body. If the depth of this recess corresponds to the thickness of the cuff, the latter will not form any additional thickness.
  • the invention also relates to a stopper production method characterized in that said cuff is first shaped separately from the body, for example by hydraulic pressing and then pressed isostatically at the same time as the body.
  • said powder of the material forming the ring is introduced into the mold at the same time as the powder of the material constituting the body of the stopper rod.
  • the assembly is then isostatically co-pressed in a single operation.
  • FIG. 1 shows an overall view of a stopper rod produced in accordance with a first embodiment of the invention.
  • This stopper rod has a body 1 of generally elongated shape, having an upper part 1a and a lower part 1b.
  • fixing means for example a metal insert such as 2, or any other fixing means making it possible to fix the stopper rod to a lever.
  • the lower part of the stopper rod ends with a rounded or conical nose intended to fit on a seat provided in the bottom of a distributor (not shown).
  • the stopper's nose is made of a material different from that of the body in order to give it increased resistance in this area which is particularly subject to erosion. However, this characteristic is not essential.
  • the nose could be made of the same material as the body.
  • the stopper rod is traversed right through by a longitudinal channel 3 which opens at the lower end of the nose. This channel is used to inject a neutral gas such as argon.
  • the stopper rod has a cuff 4 having increased resistance to erosion.
  • this cuff 4 is made of a material different from the material of the body.
  • the body can be made of graphite alumina, while the cuff 4 will be made of magnesia, zirconia, graphite zirconia, graphite magnesia or another adopted material. It is noted that the cuff 4 does not form any additional thickness relative to the body. It can be carried out according to different methods.
  • the cuff is produced separately, for example by hydraulic pressing, then it is placed in the mold which gives its shape to the body which is then filled with the powder of the material forming the body. The assembly is then isostatically co-pressed.
  • the mold is filled with the powder of the material forming the body and with the powder of the material forming the cuff. The latter is then isostatically co-pressed in a single operation.
  • the cuff can also be produced separately in two or more parts to be inserted into a recess provided in the body and then fixed, for example cemented, in this recess.
  • FIG. 2 An alternative embodiment of the stopper of the invention in which the erosion-resistant cuff is constituted by a simple extra thickness made of the same material as the body.
  • This variant embodiment is particularly simple to produce. It offers increased resistance to erosion because that the section of the stopper rod is increased at the level of the line of immersion in the molten metal. It therefore makes it possible to extend the duration of the casting campaign in a simple and economical manner.
  • FIG. 3 a third alternative embodiment.
  • the ring 6 forms an additional thickness relative to the body of the stopper rod. It can be made in a single part then threaded onto the body to be fixed, for example cemented, in an appropriate position on this body.
  • the ring 6 could also be made in two or more parts, although this embodiment is of no particular interest since here the body does not have a recess.
  • FIG. 4 a fourth alternative embodiment of the stopper of the invention.
  • This variant combines the characteristics of Figures 1 and 2.
  • the erosion resistant cuff is formed by a ring 7 made of a material having particularly high characteristics of resistance to erosion.
  • the cuff 7 forms an extra thickness which increases the cross section of the stopper rod at the level of its immersion in the liquid metal.
  • the increase in the resistance to erosion is therefore obtained here both by the characteristics of the material of the sleeve 7 and by an increase in the diameter of the latter.
  • This variant like that of FIG. 3, therefore allows particularly long casting sequences.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Lift Valve (AREA)

Description

Le procédé de coulée en continu de l'acier est actuellement majoritairement utilisé en sidérurgie. L'acier liquide, à sa sortie du convertisseur est coulé dans une poche de grande contenance, puis versé dans un répartiteur de contenance plus petite qui permet de le couler en continu dans un ou plusieurs moules.The continuous casting process of steel is currently mainly used in the steel industry. The liquid steel, at its outlet from the converter is poured into a large capacity pocket, then poured into a smaller capacity distributor which allows it to be continuously cast in one or more molds.

L'écoulement de l'acier liquide du répartiteur vers le ou les moules peut être régulé et/ou stoppé par différents moyens. Le moyen le plus employé actuellement est la quenouille. Une quenouille est une pièce allongée de matière réfractaire qui plonge dans l'acier liquide. Son extrémité inférieure s'applique sur le siège d'un trou de coulée prévu dans le fond du répartiteur. Un bras fixé à sa partie supérieure permet d'écarter plus ou moins son extrémité inférieure du siège du trou de coulée et ainsi de réguler ou de stopper l'écoulement du métal. On connaît également des dispositifs rotatifs dans lesquels l'écoulement du métal est régulé par la rotation.The flow of liquid steel from the distributor to the mold or molds can be regulated and / or stopped by various means. The most widely used means today is distaff. A stopper is an elongated piece of refractory material that dips into liquid steel. Its lower end is applied to the seat of a tap hole provided in the bottom of the distributor. An arm fixed at its upper part makes it possible to move its lower end more or less away from the seat of the tap hole and thus to regulate or stop the flow of the metal. Rotary devices are also known in which the flow of metal is controlled by rotation.

De façon habituelle, on recouvre la surface libre du métal en fusion contenu tant dans la poche que dans le répartiteur d'une poudre de couverture, généralement de nature synthétique. Cette poudre a plusieurs fonctions. Elle évite l'oxydation du métal en l'isolant de l'air ambiant, réduit les pertes thermiques, et piège les inclusions qui remontent à la surface de l'acier.Usually, the free surface of the molten metal contained both in the pocket and in the distributor is covered with a covering powder, generally of a synthetic nature. This powder has several functions. It prevents oxidation of the metal by isolating it from the ambient air, reduces heat losses, and traps inclusions which rise to the surface of the steel.

Toutefois, l'utilisation d'une poudre de couverture n'est pas sans inconvénients. En effet cette poudre provoque l'érosion de la quenouille au niveau de sa ligne d'immersion dans l'acier. Cette érosion est d'autant plus forte que les poudres actuellement utilisées sont très agressives vis-à-vis des matériaux réfractaires utilisés pour réaliser les quenouilles. Par ailleurs une couche de laitier flotte à la surface du métal liquide contenu dans la poche. Ce laitier provient des impuretés contenues dans le minerai de fer et qui, plus légères que l'acier, remontent à sa surface lorsqu'il est mis en fusion. Dans toute la mesure du possible on s'efforce d'éviter que le laitier contenu dans la poche ne passe dans le répartiteur en fermant la poche avant que le laitier ne commence à passer dans le répartiteur. Malgré cette précaution, il est cependant inévitable qu'une certaine quantité de laitier parvienne dans le répartiteur. Ce laitier a également une action corrosive sur la quenouille.
L'érosion conjuguée du laitier et de la poudre de couverture provoque l'apparition d'un affaiblissement de la section de la quenouille au niveau de sa ligne d'immersion dans le métal liquide. Cette réduction de section fragilise la quenouille et peut causer sa rupture. Une telle rupture conduit à la perte du contrôle de l'écoulement du métal. La totalité du métal contenu dans le répartiteur est alors perdue et peut provoquer des dégâts considérables au moule de coulée en continu et à l'ensemble de l'installation. Cela implique également des risques considérables pour le personnel se trouvant à proximité du répartiteur. Il est donc absolument indispensable d'éviter tout risque de rupture de la quenouille.However, the use of a covering powder is not without drawbacks. In fact, this powder causes the distaff to erode at its immersion line in the steel. This erosion is all the stronger since the powders currently used are very aggressive with respect to the refractory materials used to make the cattails. In addition, a layer of slag floats on the surface of the liquid metal contained in the bag. This slag comes from the impurities contained in the iron ore and which, lighter than steel, rise to its surface when it is melted. Every effort is made to prevent the slag contained in the bag from passing in the distributor by closing the pocket before the slag begins to pass through the distributor. Despite this precaution, it is however inevitable that a certain quantity of slag reaches the distributor. This slag also has a corrosive action on the distaff.
The combined erosion of the slag and the covering powder causes the appearance of a weakening of the section of the stopper rod at its level of immersion in the liquid metal. This reduction in section weakens the stopper rod and can cause it to break. Such a rupture leads to the loss of control over the flow of the metal. All of the metal contained in the distributor is then lost and can cause considerable damage to the continuous casting mold and to the entire installation. This also involves considerable risks for personnel in the vicinity of the dispatcher. It is therefore absolutely essential to avoid any risk of the stopper breaking.

C'est pourquoi, pour des raisons de sécurité on interrompt la séquence de coulée dès que l'érosion de la quenouille fait naître un risque de rupture. L'érosion de la quenouille est par conséquent un facteur qui limite la durée de la séquence de coulée, c'est-à-dire le nombre de poches qu'il est possible de couler au cours d'une même séquence. Les documents FR-A-2 467 769 et JP-A-63 104 760 décrivent des busettes pour la coulée continue de l'acier comportant des manchettes résistantes à l'érosion disposées en position fixe par rapport au niveau de l'acier dans le moule.
Le document JP-A 113 0857 décrit une quenouille comportant une manchette réalisée essentiellement en silice et disposée sur toute la hauteur de la quenouille pour éviter que l'alumine formant la quenouille ne se dissolve dans l'acier.This is why, for safety reasons, the casting sequence is interrupted as soon as the erosion of the stopper rod gives rise to a risk of rupture. The erosion of the stopper rod is therefore a factor which limits the duration of the casting sequence, that is to say the number of pockets which it is possible to sink during the same sequence. Documents FR-A-2 467 769 and JP-A-63 104 760 describe nozzles for the continuous casting of steel comprising erosion-resistant sleeves arranged in a fixed position relative to the level of the steel in the mold.
Document JP-A 113 0857 describes a stopper comprising a cuff made essentially of silica and disposed over the entire height of the stopper to prevent the alumina forming the stopper from dissolving in the steel.

La présente invention a pour objet une quenouille qui remédie à ces inconvénients. Elle présente une résistance accrue vis-à-vis de l'érosion tant du laitier que de la poudre de couverture. Elle permet par conséquent une séquence de coulée plus longue sans risque de rupture. Elle s'applique également aux mécanismes rotatifs (valves rotatives).
Cette quenouille comporte un corps allongé obtenu par un pressage isostatique en un premier matériau, pour réguler l'écoulement d'acier liquide d'un répartiteur contenant une quantité sensiblement constante d'acier liquide vers un moule de coulée continue, une couche de poudre de couverture flottant à la surface de l'acier liquide. Elle est caractérisée en ce qu'elle comporte une manchette résistant à l'érosion entourant le corps, s'étendant sur une partie seulement de la hauteur du corps, et située selon la direction longitudinale de la quenouille à une hauteur telle que, lorsque la quenouille est en fonctionnement, la manchette se trouve au niveau de la ligne d'immersion de la quenouille, la manchette présentant une hauteur suffisante pour tenir compte des légères variations de la hauteur au niveau de l'acier ainsi que des mouvements de la quenouille au cours de son fonctionnement, ladite manchette étant réalisée en un second matériau présentant des caractéristiques élevées de résistance à l'érosion par la poudre de couverture.The present invention relates to a stopper rod which overcomes these drawbacks. It has increased resistance to erosion from both slag and covering powder. It therefore allows a longer casting sequence without risk of breakage. It also applies to rotary mechanisms (rotary valves).
This stopper has an elongated body obtained by isostatic pressing of a first material, to regulate the flow of liquid steel from a distributor containing a substantially constant amount of liquid steel to a continuous casting mold, a layer of cover powder floating on the surface of the liquid steel. It is characterized in that it comprises an erosion-resistant cuff surrounding the body, extending over only part of the height of the body, and situated in the longitudinal direction of the stopper rod at a height such that, when the the stopper rod is in operation, the cuff is at the level of the stopper immersion line, the cuff having a height sufficient to take account of slight variations in height at the steel level as well as the movements of the stopper rod at the during its operation, said sleeve being made of a second material having high characteristics of resistance to erosion by the covering powder.

Etant donné que l'érosion s'effectue au niveau de la manchette présentant une résistance accrue, cette section renforcée de la quenouille n'est pas érodée, ou du moins elle l'est beaucoup moins.
On évite ainsi un affaiblissement mécanique trop important de la quenouille et en conséquence il est possible de prolonger notablement la durée de la séquence de coulée. Il en résulte un avantage économique évident.
A titre d'exemple le matériau présentant des caractéristiques particulièrement élevées de résistance à l'érosion peut être choisi dans le groupe comprenant la zircone, la magnésie, la zircone graphitée, la magnésie graphitée.Since erosion takes place at the cuff with increased resistance, this reinforced section of the stopper rod is not eroded, or at least it is much less.
This avoids excessive mechanical weakening of the stopper rod and consequently it is possible to significantly extend the duration of the casting sequence. This results in an obvious economic advantage.
By way of example, the material having particularly high characteristics of resistance to erosion can be chosen from the group comprising zirconia, magnesia, graphitized zirconia, graphitized magnesia.

Selon une autre réalisation la quenouille de l'invention comprend un corps allongé présentant une surépaisseur. Cette surépaisseur peut être constituée par le matériau du corps lui-même. Dans ce cas la quenouille est réalisée en un matériau unique. Ou bien la surépaisseur peut être constituée, tout au moins en partie, par une manchette réalisée en un second matériau différent de celui du corps. De préférence ce second matériau présente des caractéristiques élevées de résistance à l'érosion par le laitier et la poudre de couverture.According to another embodiment, the stopper of the invention comprises an elongated body having an extra thickness. This extra thickness can be constituted by the material of the body itself. In this case the stopper rod is made of a single material. Or the additional thickness may be constituted, at least in part, by a cuff made of a second material different from that of the body. Preferably, this second material has high characteristics of resistance to erosion by the slag and the covering powder.

La manchette peut être réalisée en une seule pièce et fixée ou cimentée sur la surface extérieure du corps. Il peut également être réalisé en deux ou plusieurs parties, ce qui permet alors de l'insérer dans un évidement pratiqué dans le corps. Si la profondeur de cet évidement correspond à l'épaisseur de la manchette, ce dernier ne formera aucune surépaisseur.The cuff can be made in one piece and fixed or cemented on the surface outside of the body. It can also be made in two or more parts, which then makes it possible to insert it into a recess made in the body. If the depth of this recess corresponds to the thickness of the cuff, the latter will not form any additional thickness.

L'invention concerne encore un procédé de réalisation de quenouille caractérisé en ce que ladite manchette est d'abord mise en forme séparément du corps, par exemple par pressage hydraulique puis pressé
isostatiquement en même temps que le corps. Selon une variante de ce procédé la poudre du matériau formant l'anneau est introduite dans le moule en même temps que la poudre du matériau constituant le corps de la quenouille. L'ensemble est alors co-pressé isostatiquement en une seule opération.The invention also relates to a stopper production method characterized in that said cuff is first shaped separately from the body, for example by hydraulic pressing and then pressed
isostatically at the same time as the body. According to a variant of this process, the powder of the material forming the ring is introduced into the mold at the same time as the powder of the material constituting the body of the stopper rod. The assembly is then isostatically co-pressed in a single operation.

D'autres caractéristiques et avantages de la présente invention apparaîtront encore à la lecture de la description d'exemple de réalisation donné à titre illustratif en référence aux figures annexées sur lesquelles :

  • la figure 1 est une vue d'ensemble d'une quenouille conforme à l'invention ;
  • la figure 2 est une vue fragmentaire d'une quenouille réalisée conformément à un second mode de réalisation de l'invention ;
  • la figure 3 est une vue fragmentaire d'un troisième mode de réalisation de l'invention ;
  • la figure 4 est une vue fragmentaire d'un quatrième mode de réalisation de l'invention.
Other characteristics and advantages of the present invention will become apparent on reading the description of an exemplary embodiment given by way of illustration with reference to the appended figures in which:
  • Figure 1 is an overview of a stopper rod according to the invention;
  • Figure 2 is a fragmentary view of a stopper rod produced in accordance with a second embodiment of the invention;
  • Figure 3 is a fragmentary view of a third embodiment of the invention;
  • Figure 4 is a fragmentary view of a fourth embodiment of the invention.

On a représenté sur la figure 1 une vue d'ensemble d'une quenouille réalisée conformément à un premier mode de réalisation de l'invention. Cette quenouille comporte un corps 1 de forme générale allongée, présentant une partie supérieure la et une partie inférieure 1b. A la partie supérieure 1a de la quenouille sont prévus des moyens de fixation, par exemple un insert métallique tel que 2, ou tout autre moyen de fixation permettant de fixer la quenouille à un levier. La partie inférieure de la quenouille est terminée par un nez de forme arrondie ou conique destiné à s'adapter sur un siège prévu dans le fond d'un répartiteur (non représenté). Dans l'exemple représenté le nez de la quenouille est constitué d'un matériau différent de celui du corps afin de lui conférer une résistance accrue dans cette zone particulièrement soumise à l'érosion. Toutefois cette caractéristique n'est pas indispensable. Le nez pourrait être réalisé dans le même matériau que le corps.FIG. 1 shows an overall view of a stopper rod produced in accordance with a first embodiment of the invention. This stopper rod has a body 1 of generally elongated shape, having an upper part 1a and a lower part 1b. At the upper part 1a of the stopper are provided fixing means, for example a metal insert such as 2, or any other fixing means making it possible to fix the stopper rod to a lever. The lower part of the stopper rod ends with a rounded or conical nose intended to fit on a seat provided in the bottom of a distributor (not shown). In the example shown, the stopper's nose is made of a material different from that of the body in order to give it increased resistance in this area which is particularly subject to erosion. However, this characteristic is not essential. The nose could be made of the same material as the body.

On remarque également que la quenouille est traversée de part en part par un canal longitudinal 3 qui débouche à l'extrémité inférieure du nez. Ce canal permet d'injecter un gaz neutre tel que l'argon. Toutefois cette caractéristique n'est pas non plus obligatoire. Conformément à l'invention la quenouille comporte une manchette 4 présentant une résistance accrue à l'érosion. Dans l'exemple de la figure 1 cette manchette 4 est constituée par un matériau différent du matériau du corps. A titre d'exemple le corps peut être réalisé en alumine graphitée, tandis que la manchette 4 sera réalisée en magnésie, en zircone, en zircone graphitée, en magnésie graphitée ou un autre matériau adopté. On remarque que la manchette 4 ne forme aucune surépaisseur par rapport au corps. Elle peut être réalisée selon différents procédés. Tout d'abord elle peut être co-pressée isostatiquement en même temps que le corps de la quenouille, avec deux variantes possible. Selon la première variante la manchette est réalisée à part, par exemple par un pressage hydraulique puis il est disposé dans le moule qui donne sa forme au corps qui est alors rempli par la poudre du matériau formant le corps. L'ensemble est ensuite co-pressé isostatiquement. Selon une seconde variante de réalisation on remplit le moule de la poudre du matériau formant le corps et de la poudre du matériau formant la manchette. Ce dernier est alors co-pressé isostatiquement en une seule opération. La manchette peut également être réalisée séparément en deux ou plusieurs parties pour être inséré dans un évidement prévu dans le corps puis fixé, par exemple cimenté, dans cet évidement.We also note that the stopper rod is traversed right through by a longitudinal channel 3 which opens at the lower end of the nose. This channel is used to inject a neutral gas such as argon. However, this characteristic is also not compulsory. According to the invention, the stopper rod has a cuff 4 having increased resistance to erosion. In the example of Figure 1 this cuff 4 is made of a material different from the material of the body. For example, the body can be made of graphite alumina, while the cuff 4 will be made of magnesia, zirconia, graphite zirconia, graphite magnesia or another adopted material. It is noted that the cuff 4 does not form any additional thickness relative to the body. It can be carried out according to different methods. First of all, it can be isostatically co-pressed at the same time as the stopper body, with two possible variants. According to the first variant, the cuff is produced separately, for example by hydraulic pressing, then it is placed in the mold which gives its shape to the body which is then filled with the powder of the material forming the body. The assembly is then isostatically co-pressed. According to a second alternative embodiment, the mold is filled with the powder of the material forming the body and with the powder of the material forming the cuff. The latter is then isostatically co-pressed in a single operation. The cuff can also be produced separately in two or more parts to be inserted into a recess provided in the body and then fixed, for example cemented, in this recess.

On a représenté sur la figure 2 une variante de réalisation de la quenouille de l'invention dans laquelle la manchette résistant à l'érosion est constituée par une simple surépaisseur réalisée dans le même matériau que le corps. Cette variante de réalisation est particulièrement simple à réaliser. Elle offre une résistance accrue à l'érosion parce que la section de la quenouille est augmentée au niveau de la ligne d'immersion dans le métal liquide. Elle permet donc de prolonger la durée de la campagne de coulée de manière simple et économique.There is shown in Figure 2 an alternative embodiment of the stopper of the invention in which the erosion-resistant cuff is constituted by a simple extra thickness made of the same material as the body. This variant embodiment is particularly simple to produce. It offers increased resistance to erosion because that the section of the stopper rod is increased at the level of the line of immersion in the molten metal. It therefore makes it possible to extend the duration of the casting campaign in a simple and economical manner.

On a représenté sur la figure 3 une troisième variante de réalisation. L'anneau 6 forme une surépaisseur par rapport au corps de la quenouille. Il peut être réalisé en une seule partie puis enfilé sur le corps pour être fixé, par exemple cimenté, dans une position appropriée sur ce corps. L'anneau 6 pourrait également être réalisé en deux ou plusieurs parties, bien que ce mode de réalisation ne présente pas d'intérêt particulier étant donné qu'ici le corps ne comporte pas d'évidement.There is shown in Figure 3 a third alternative embodiment. The ring 6 forms an additional thickness relative to the body of the stopper rod. It can be made in a single part then threaded onto the body to be fixed, for example cemented, in an appropriate position on this body. The ring 6 could also be made in two or more parts, although this embodiment is of no particular interest since here the body does not have a recess.

On a représenté sur la figure 4 une quatrième variante de réalisation de la quenouille de l'invention. Cette variante combine les caractéristiques des figures 1 et 2. La manchette résistant à l'érosion est formée par un anneau 7 réalisé en un matériau présentant des caractéristiques particulièrement élevées de résistance à l'érosion. Mais dans cette variante, la manchette 7 forme une surépaisseur qui augmente la section de la quenouille au niveau de son immersion dans le métal liquide. L'accroissement de la résistance à l'érosion est donc obtenu ici à la fois par les caractéristiques du matériau de la manchette 7 et par une augmentation du diamètre de cette dernière. Cette variante, comme celle de la figure 3, permet donc des séquences de coulée particulièrement longues.There is shown in Figure 4 a fourth alternative embodiment of the stopper of the invention. This variant combines the characteristics of Figures 1 and 2. The erosion resistant cuff is formed by a ring 7 made of a material having particularly high characteristics of resistance to erosion. But in this variant, the cuff 7 forms an extra thickness which increases the cross section of the stopper rod at the level of its immersion in the liquid metal. The increase in the resistance to erosion is therefore obtained here both by the characteristics of the material of the sleeve 7 and by an increase in the diameter of the latter. This variant, like that of FIG. 3, therefore allows particularly long casting sequences.

Claims (7)

  1. Stopper rod having an elongate body (1) obtained by isostatic pressing of a first material, in order to regulate the flow of liquid steel from a tundish containing a substantially constant quantity of liquid steel to a continuous casting mould, a layer of coverage powder floating on the surface of the liquid steel, and having a sleeve surrounding the body (1), characterized in that the sleeve (4, 5, 6, 7) extends over only part of the height of the body (1) and lies in the longitudinal direction of the stopper rod at a height such that, when the stopper rod is in operation, the sleeve (4, 5, 6, 7) is at the level of the immersion line of the stopper rod, the sleeve having a sufficient height to take into account slight variations in the height of the level of the steel as well as movements of the stopper rod during its operation, and in that the said sleeve is made of a second material (4, 6, 7) having high properties of resistance to erosion by the coverage powder, or consists of an additional thickness (5) of the body (1).
  2. Stopper rod according to Claim 1, characterized in that the said material having high erosion-resistance properties is chosen from the group comprising zirconia, magnesia, graphite-containing zirconia and graphite-containing magnesia.
  3. Stopper rod according to either of Claims 1 and 2, characterized in that the erosion-resistant sleeve consists of an additional thickness (6, 7) of the said second material.
  4. Stopper rod according to Claim 3, characterized in that the additional thickness (6) is fixed to the outer surface of the body (1).
  5. Stopper rod according to any one of Claims 1 to 4, characterized in that it has a sleeve (4, 7) made in at least two parts and fixed in a recess in the body (1, 4) or in the additional thickness of the body (1, 7).
  6. Process for producing a stopper rod according to any one of claims 1 to 5, characterized in that the said sleeve (4, 6, 7) is formed separately from the body and then isostatically co-pressed at the same time as the body (1).
  7. Process for producing a stopper rod according to any one of claims 1 to 5, characterized in that the sleeve (4, 7) is isostatically co-pressed at the same time as the body (1).
EP92105388A 1991-04-09 1992-03-28 Stopper rod having an erosion-resistant sleeve Expired - Lifetime EP0508246B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9104403A FR2675064B1 (en) 1991-04-09 1991-04-09 CATTLE WITH AN EROSION RESISTANT CUFF.
FR9104403 1991-04-09

Publications (2)

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EP0508246A1 EP0508246A1 (en) 1992-10-14
EP0508246B1 true EP0508246B1 (en) 1997-10-08

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EP92105388A Expired - Lifetime EP0508246B1 (en) 1991-04-09 1992-03-28 Stopper rod having an erosion-resistant sleeve

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US (1) US5259596A (en)
EP (1) EP0508246B1 (en)
JP (1) JPH05146867A (en)
DE (1) DE69222557T2 (en)
ES (1) ES2109287T3 (en)
FR (1) FR2675064B1 (en)

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FR2727339B3 (en) * 1994-11-25 1996-09-20 Lorraine Laminage STEEL CONTINUOUS CASTING DISPENSER
FR2728491B1 (en) * 1994-12-22 1997-03-14 Lorraine Laminage DEVICE FOR CASTING A LIQUID METAL WITH INJECTION OF AN INERATED GAS INTO THE LIQUID METAL DURING CASTING
JP2984206B2 (en) * 1995-09-18 1999-11-29 明智セラミックス株式会社 Tundish stopper for continuous casting
US5820815A (en) * 1996-01-17 1998-10-13 Kennecott Holdings Corporation Cooled tapping device
US5908577A (en) * 1996-08-26 1999-06-01 Shinagawa Refractories Co., Ltd. Nozzle for continuous casting
KR20010032488A (en) * 1997-11-27 2001-04-25 와이 에스 첸 Stopper rod
AU3698299A (en) * 1998-05-05 1999-11-23 Didier-Werke A.G. Ceramic composite body
GB9817645D0 (en) * 1998-08-14 1998-10-07 Didier Werke Ag Stopper
EP1243361A1 (en) * 2001-03-19 2002-09-25 Vesuvius Crucible Company Apparatus for injecting gas into molten metal
JP4777611B2 (en) * 2001-06-08 2011-09-21 ベスビウス クルーシブル カンパニー Stopper rod
US20060249546A1 (en) * 2005-05-03 2006-11-09 Foseco International Limited Tundish stopper rod for continuous molten metal casting
DE602008003241D1 (en) * 2008-11-19 2010-12-09 Refractory Intellectual Prop stopper rod
US8210402B2 (en) * 2009-02-09 2012-07-03 Ajf, Inc. Slag control shape device with L-shape loading bracket
CN106513652B (en) * 2016-11-16 2018-10-09 成都先进金属材料产业技术研究院有限公司 Erosion-resistant stopper
CN111470851A (en) * 2019-08-27 2020-07-31 北京利尔高温材料股份有限公司 Rod body material for integral stopper rod

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JPH01130857A (en) * 1987-11-18 1989-05-23 Nkk Corp Stopper for continuous casting

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Also Published As

Publication number Publication date
JPH05146867A (en) 1993-06-15
FR2675064B1 (en) 1995-06-02
EP0508246A1 (en) 1992-10-14
DE69222557T2 (en) 1998-03-05
DE69222557D1 (en) 1997-11-13
US5259596A (en) 1993-11-09
ES2109287T3 (en) 1998-01-16
FR2675064A1 (en) 1992-10-16

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