EP1373584A2 - Vacuum chamber, notably for steel decarburisation - Google Patents

Vacuum chamber, notably for steel decarburisation

Info

Publication number
EP1373584A2
EP1373584A2 EP02753731A EP02753731A EP1373584A2 EP 1373584 A2 EP1373584 A2 EP 1373584A2 EP 02753731 A EP02753731 A EP 02753731A EP 02753731 A EP02753731 A EP 02753731A EP 1373584 A2 EP1373584 A2 EP 1373584A2
Authority
EP
European Patent Office
Prior art keywords
steel
plunger
plungers
joint
tank
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.)
Granted
Application number
EP02753731A
Other languages
German (de)
French (fr)
Other versions
EP1373584B1 (en
Inventor
Jean-Claude Lecas
Pascal Capelli
Paul Hayez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
USINOR SA
Original Assignee
USINOR SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by USINOR SA filed Critical USINOR SA
Publication of EP1373584A2 publication Critical patent/EP1373584A2/en
Application granted granted Critical
Publication of EP1373584B1 publication Critical patent/EP1373584B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising

Definitions

  • Vacuum treatment chamber in particular steel decarburization.
  • the present invention relates to a vacuum treatment enclosure, in particular for steel decarburization. It is known to carry out treatments of steel, taken out of a converter in which it is produced, to use a vacuum treatment chamber commonly called RHOB (Rheinstahl Heraus Oxygen Blowing).
  • RHOB Raster Heraus Oxygen Blowing
  • Such an enclosure is used to carry out decarburization or dehydrogenation treatments as well as light treatments consisting in producing a steel whose ranges of the various additives are reduced to such an extent that it is impossible to obtain it directly from the converter.
  • a vacuum treatment enclosure generally consists of two parts:
  • a quantity of gas is injected, in particular argon, by means of injection nozzles arranged internally and at the periphery of one of the so-called upright plungers allowing constant circulation of the steel at the bottom of the tank, the return of the steel in the pocket being effected by the other so-called descending plunger.
  • the plungers are associated with the legs of the tank by means of flanges comprising a seal and allowing easily, the mounting and dismounting of said plungers, their repair or their change.
  • the refractory internal parts of the plungers and the leg of the tank are made by masonry of refractory bricks, with a straight joint in the plane of the flange linking the legs and plungers.
  • the straight joint is considered to be a very weak part in terms of mechanical and chemical resistance. Erosion, which manifests itself at this point in the enclosure, is facilitated by a rate of steel recirculation of around 115 tonnes / min for 25 minutes for low carbon steels.
  • the circulation is the result of a displacement of injected argon gas of the order of 300 m / s with a flow rate of the order of 140 N / m3 / Hour.
  • This erosion usually causes significant wear at the joint and limits the resistance of the refractory masonry to a hundred treatments per campaign, with one stop for gunning every four treatments.
  • steel processing operations have to be stopped due to breakthroughs in this location. When the refractory joint plane decreases in efficiency due to wear, air introductions pollute the steel by taking up nitrogen.
  • enclosures are made in which the plungers are integral with the tank, the flange having been removed.
  • the metal ferrule of the divers is then welded directly to the tank.
  • This type of enclosure which does not allow the easy interchangeability of the divers, makes repair, masonry of the bottom of the tank very difficult, and generates a waste of time and a high cost, in the use of the enclosure.
  • the present invention aims to reduce the significant wear which is created at the joint between the leg and the plunger in an enclosure comprising a connecting flange between the leg and the plunger.
  • the subject of the invention is a vacuum treatment enclosure, in particular of steel decarburization, comprising:
  • a lower part called bottom of tank comprising two legs, provided with two plungers, a so-called rising plunger and a so-called descending plunger intended to be immersed in the steel of a pocket containing the steel to be treated, the plungers being associated with legs of the bottom of the tank by means of flanges by a joint carrying a seal, the flanges allowing the mounting and dismounting of the plungers.
  • the enclosure is characterized in that the joint comprises at least two parallel planes.
  • the joint forms at least one shoulder, ensuring a tenon-mortise type interlocking between the jamb and the plunger,
  • the post is made on the joint of the plunger, - the post is masonry fitting in the mortise of the jamb, also masonry.
  • Figure 1 shows, in section, an enclosure before the invention.
  • Figures 2A and 2B show in section, a front view and a side view of an enclosure according to the invention.
  • Figure 3 is a sectional view of the detail of the joint according to the invention.
  • the invention presented deals, as shown in FIG. 1, with an enclosure 1 for vacuum treatment, in particular for decarburization of steel, comprising:
  • the enclosure 1 may include an intermediate ring to protect wear on the top of the tank.
  • the bottom of the tank 3 is provided with two plungers 7, 8, a plunger 7 known as rising and a plunger 8 known as descending, associated respectively with the legs 4, 5 and intended to be immersed in the ladle steel, not shown, containing the steel to be treated.
  • the plungers 7, 8 are associated with the legs 4, 5 of the tank 3 by means of a flange 10, on a joint 11 carrying a seal.
  • the flanges 10 allow the mounting and dismounting of the plungers 7, 8.
  • the joint 11 comprises at least two parallel planes 12 and 13.
  • the joint 11 forms at least one shoulder 14, ensuring a tenon-mortise type interlocking between the legs 4, 5 and the plungers 7, 8.
  • the post protrudes from the joint of the plunger, and may include a chamfer with a slight slope.
  • the enclosure according to the invention is coated with an interior refractory of the masonry type, and the post of the plunger is also masonry fitting into the mortise of the jamb, also masonry.
  • the plunger is composed of a metal ferrule 15 on which the refractory bricks of the inner lining are built.
  • the bricks are linked together and on the shell by means of a cement 16.
  • the metallic shell 15 is covered with reinforced concrete 17 made by molding, in a shell defining the external dimensions of the plunger, and inserting into the volume, the nozzles intended for the injection of a circulation gas and which open at the periphery in the lower part of the plunger.
  • nozzles provide the injection, for example, of argon to generate a boil, in the liquid steel, within the space of the plunger and the space of the leg to modify the density of the steel and generate the movement as shown in the figures by arrows for circulating the steel from the pocket to the rising plunger 7.
  • the treated steel is then poured back into the pocket by the descending plunger 8, as shown by the arrow.
  • the wear at the level of the plane joint of the enclosure of the prior art was due to the design of the bottom of the tank comprising the jamb, associated with the plungers of the removable type on the ferrule.
  • the wear and tear that appeared in this zone also had the effect of a turbulence effect on the steel due to the circulation gas injected into the lower part of the plunger.
  • One solution to the problem posed was to move a part at the plane of the joint outside the turbulence zone in order to regain a wear behavior of the leg and plunger assembly reduced in such a way that the enclosure behaves as a monolithic enclosure, with the additional advantage of having ease of assembly, disassembly and change of the single lower part.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

The invention relates to a vacuum chamber (1) notably for steel decarburisation comprising: an upper part (2), or the top of the chamber, in the form of a vacuum bell; a lower part (3), or the bottom of the chamber , comprising two jambs (4, 5) which are fitted with two plungers (7, 8), namely a rising plunger (7) and a falling plunger (8), which are intended to be submerged in the steel in the cavity containing the steel to be treated. Said plungers (7, 8) are connected to the jambs (4, 5) of the tank by means of flanges (10) and a joint (11) supporting a sealing device. The flanges (10) are used to mount and dismantle the plungers. The inventive chamber is characterised in that the joint (11) comprises at least two parallel planes (12, 13).

Description

Enceinte de traitement sous vide notamment de décarburation d'acier. Vacuum treatment chamber, in particular steel decarburization.
La présente invention concerne une enceinte de traitement sous vide notamment de décarburation d'acier. II est connu pour effectuer des traitements de l'acier, sorti d'un convertisseur dans lequel il est élaboré, de recourir à une enceinte de traitement sous vide couramment appelé RHOB (Rheinstahl Heraus Oxygène Blowing).The present invention relates to a vacuum treatment enclosure, in particular for steel decarburization. It is known to carry out treatments of steel, taken out of a converter in which it is produced, to use a vacuum treatment chamber commonly called RHOB (Rheinstahl Heraus Oxygen Blowing).
Une telle enceinte sert à effectuer des traitements de décarburation ou de déshydrogénation ainsi que des traitements légers consistant à élaborer un acier dont les fourchettes des différents additifs sont réduites à un point tel qu'il est impossible de l'obtenir directement au convertisseur.Such an enclosure is used to carry out decarburization or dehydrogenation treatments as well as light treatments consisting in producing a steel whose ranges of the various additives are reduced to such an extent that it is impossible to obtain it directly from the converter.
Une enceinte de traitement sous vide est généralement constituée de deux parties :A vacuum treatment enclosure generally consists of two parts:
- une partie supérieure appelée haut de cuve ayant la forme d'une cloche à vide, - une partie inférieure, appelée bas de cuve, comportant deux jambages munis de deux plongeurs destinés à être immergés dans l'acier de la poche contenant l'acier à traiter.- an upper part called the top of the tank having the shape of a vacuum bell, - a lower part, called the bottom of the tank, comprising two legs provided with two plungers intended to be immersed in the steel of the pocket containing the steel treat.
Lors d'un traitement de décarburation de l'acier, on injecte une quantité de gaz, notamment de l'argon, au moyen de tuyères d'injection disposées intérieurement et en périphérie d'un des plongeurs dit montant permettant une circulation constante de l'acier dans le bas de cuve, le retour de l'acier dans la poche s'effectuant par l'autre plongeur dit descendant.During a decarburization treatment of the steel, a quantity of gas is injected, in particular argon, by means of injection nozzles arranged internally and at the periphery of one of the so-called upright plungers allowing constant circulation of the steel at the bottom of the tank, the return of the steel in the pocket being effected by the other so-called descending plunger.
Dans ce type d'enceinte, les plongeurs sont associés aux jambages de la cuve au moyen de brides comportant un joint d'étanchéité et permettant aisément, le montage et le démontage desdits plongeurs, leur réparation ou leur changement. Les parties internes réfractaires des plongeurs et du jambage de la cuve sont réalisées par un maçonnage de briques réfractaires, avec un joint droit dans le plan de la bride liant jambages et plongeurs.In this type of enclosure, the plungers are associated with the legs of the tank by means of flanges comprising a seal and allowing easily, the mounting and dismounting of said plungers, their repair or their change. The refractory internal parts of the plungers and the leg of the tank are made by masonry of refractory bricks, with a straight joint in the plane of the flange linking the legs and plungers.
Le joint droit est considéré comme une partie très faible en terme de résistance mécanique et chimique. L'érosion, qui se manifeste à cet endroit de l'enceinte, est facilitée par un taux de recirculation d'acier de l'ordre de 115 tonnes/mn pendant 25 mn pour des aciers bas carbone. La circulation est le résultat d'un déplacement de gaz argon injecté de l'ordre de 300 m/s avec un débit de l'ordre de 140 N/m3/Heure. Cette érosion entraîne habituellement une usure importante au niveau de la jointure et limite la tenue du maçonnage réfractaire à une centaine de traitements par campagne, avec un arrêt pour gunitage tous les quatre traitements. Il arrive de devoir stopper les opérations de traitement de l'acier pour cause de percée en cet endroit. Lorsque le plan de joint réfractaire diminue en efficacité à cause de l'usure, des introductions d'air polluent l'acier par reprise d'azote.The straight joint is considered to be a very weak part in terms of mechanical and chemical resistance. Erosion, which manifests itself at this point in the enclosure, is facilitated by a rate of steel recirculation of around 115 tonnes / min for 25 minutes for low carbon steels. The circulation is the result of a displacement of injected argon gas of the order of 300 m / s with a flow rate of the order of 140 N / m3 / Hour. This erosion usually causes significant wear at the joint and limits the resistance of the refractory masonry to a hundred treatments per campaign, with one stop for gunning every four treatments. Sometimes steel processing operations have to be stopped due to breakthroughs in this location. When the refractory joint plane decreases in efficiency due to wear, air introductions pollute the steel by taking up nitrogen.
Pour éviter ce problème, on réalise des enceintes dans lesquelles les plongeurs sont solidaires de la cuve, la bride ayant été supprimée. La virole métallique des plongeurs est alors soudée directement sur la cuve. Ce type d'enceinte, qui ne permet pas l'interchangeabilité facile des plongeurs, rend très difficile la réparation, le maçonnage du bas de cuve, et génère une perte de temps et un coût élevé, dans l'utilisation de l'enceinte.To avoid this problem, enclosures are made in which the plungers are integral with the tank, the flange having been removed. The metal ferrule of the divers is then welded directly to the tank. This type of enclosure, which does not allow the easy interchangeability of the divers, makes repair, masonry of the bottom of the tank very difficult, and generates a waste of time and a high cost, in the use of the enclosure.
La présente invention a pour but de réduire l'usure importante qui se créée au niveau de la jointure entre jambage et plongeur dans une enceinte comportant une bride de liaison entre jambage et plongeur.The present invention aims to reduce the significant wear which is created at the joint between the leg and the plunger in an enclosure comprising a connecting flange between the leg and the plunger.
L'invention a pour objet une enceinte de traitement sous vide notamment de décarburation d'acier comprenant :The subject of the invention is a vacuum treatment enclosure, in particular of steel decarburization, comprising:
- une partie supérieure appelée haut de cuve ayant la forme d'une cloche à vide,- an upper part called the top of the tank having the shape of a vacuum bell,
- une partie inférieure appelée bas de cuve comportant deux jambages, munis de deux plongeurs, un plongeur dit montant et un plongeur dit descendant destinés à être immergés dans l'acier d'une poche contenant l'acier à traiter, les plongeurs étant associés aux jambages du bas de cuve au moyen de brides par une jointure portant un joint d'étanchéité, les brides permettant le montage et le démontage des plongeurs. L'enceinte se caractérise en ce que la jointure comporte au moins deux plans parallèles.- A lower part called bottom of tank comprising two legs, provided with two plungers, a so-called rising plunger and a so-called descending plunger intended to be immersed in the steel of a pocket containing the steel to be treated, the plungers being associated with legs of the bottom of the tank by means of flanges by a joint carrying a seal, the flanges allowing the mounting and dismounting of the plungers. The enclosure is characterized in that the joint comprises at least two parallel planes.
Les autres caractéristiques de l'invention sont :The other characteristics of the invention are:
- la jointure forme au moins un épaulement, assurant un emboîtement du type tenon - mortaise entre le jambage et le plongeur,- the joint forms at least one shoulder, ensuring a tenon-mortise type interlocking between the jamb and the plunger,
- le tenon est réalisé sur la jointure du plongeur, - le tenon est maçonné s'ajustant dans la mortaise du jambage, également maçonnée.- the post is made on the joint of the plunger, - the post is masonry fitting in the mortise of the jamb, also masonry.
La description qui suit avec les figures annexées, le tout donné à titre d'exemple non limitatif, fera bien comprendre l'invention. La figure 1 présente, en coupe, une enceinte avant l'invention.The description which follows with the appended figures, all given by way of nonlimiting example, will make the invention better understood. Figure 1 shows, in section, an enclosure before the invention.
Les figures 2A et 2B représentent en coupe, une vue de face et une vue de profil d'une enceinte selon l'invention. La figure 3 est une vue, en coupe, du détail de la jointure selon l'invention.Figures 2A and 2B show in section, a front view and a side view of an enclosure according to the invention. Figure 3 is a sectional view of the detail of the joint according to the invention.
L'invention présentée traite, comme représenté sur la figure 1 d'une enceinte 1 de traitement sous vide notamment de décarburation d'acier comprenant :The invention presented deals, as shown in FIG. 1, with an enclosure 1 for vacuum treatment, in particular for decarburization of steel, comprising:
- une partie supérieure, appelée haut de cuve 2 ayant la forme d'une cloche à vide, et destinée à créer un vide au-dessus du bain d'acier traité, en circulation dans l'enceinte 1. L'enceinte 1 peut comporter un anneau intermédiaire pour protéger l'usure du haut de cuve.- An upper part, called the top of the tank 2 having the shape of a vacuum bell, and intended to create a vacuum above the bath of treated steel, circulating in the enclosure 1. The enclosure 1 may include an intermediate ring to protect wear on the top of the tank.
- une partie inférieure appelée bas de cuve 3 dans laquelle est amené, par relevage, l'acier à traiter, partie inférieure comportant deux jambages 4, 5.- A lower part called bottom of tank 3 into which is brought, by lifting, the steel to be treated, lower part comprising two legs 4, 5.
Comme représenté sur les figures 2A et 2B, le bas de cuve 3 est munie de deux plongeurs 7, 8, un plongeur 7 dit montant et un plongeur 8 dit descendant, associés respectivement aux jambages 4, 5 et destinés à être immergés dans l'acier de la poche, non représentée, contenant l'acier à traiter. Les plongeurs 7, 8 sont associés aux jambages 4, 5 de la cuve 3 au moyen d'une bride 10, sur une jointure 11 portant un joint d'étanchéité. Les brides 10 permettent le montage et le démontage des plongeurs 7, 8. Selon l'invention et comme présenté sur le détail de la figure 3, la jointure 11 comporte au moins deux plans parallèles 12 et 13. La jointure 11 forme au moins un épaulement 14, assurant un emboîtement du type tenon - mortaise entre les jambages 4, 5 et les plongeurs 7, 8.As shown in FIGS. 2A and 2B, the bottom of the tank 3 is provided with two plungers 7, 8, a plunger 7 known as rising and a plunger 8 known as descending, associated respectively with the legs 4, 5 and intended to be immersed in the ladle steel, not shown, containing the steel to be treated. The plungers 7, 8 are associated with the legs 4, 5 of the tank 3 by means of a flange 10, on a joint 11 carrying a seal. The flanges 10 allow the mounting and dismounting of the plungers 7, 8. According to the invention and as shown in the detail in FIG. 3, the joint 11 comprises at least two parallel planes 12 and 13. The joint 11 forms at least one shoulder 14, ensuring a tenon-mortise type interlocking between the legs 4, 5 and the plungers 7, 8.
De préférence, le tenon est en saillie sur la jointure du plongeur, et peut comporter un chanfrein à faible pente.Preferably, the post protrudes from the joint of the plunger, and may include a chamfer with a slight slope.
L'enceinte selon l'invention est revêtue d'un réfractaire intérieur du type maçonné, et le tenon du plongeur est également maçonné s'ajustant dans la mortaise du jambage, également maçonnée.The enclosure according to the invention is coated with an interior refractory of the masonry type, and the post of the plunger is also masonry fitting into the mortise of the jamb, also masonry.
De manière plus détaillée, le plongeur est composé d'une virole métallique 15 sur laquelle sont maçonnées les briques réfractaires du revêtement intérieur. Les briques sont liées entre elles et sur la virole au moyen d'un ciment 16. Extérieurement, la virole 15 métallique est recouverte de béton armé 17 effectué par moulage, dans une coquille définissant les dimensions extérieures du plongeur, et insérant dans le volume, les tuyères destinées à l'injection d'un gaz de circulation et qui débouchent en périphérie dans la partie inférieure du plongeur.In more detail, the plunger is composed of a metal ferrule 15 on which the refractory bricks of the inner lining are built. The bricks are linked together and on the shell by means of a cement 16. Externally, the metallic shell 15 is covered with reinforced concrete 17 made by molding, in a shell defining the external dimensions of the plunger, and inserting into the volume, the nozzles intended for the injection of a circulation gas and which open at the periphery in the lower part of the plunger.
Ces tuyères assurent l'injection, par exemple, d'argon pour générer une ébullition, dans l'acier liquide, au sein de l'espace du plongeur et de l'espace du jambage pour modifier la densité de l'acier et générer le mouvement comme matérialisé sur les figures par des flèches de circulation de l'acier de la poche vers le plongeur montant 7. L'acier traité est ensuite reversé dans la poche par le plongeur descendant 8, comme matérialisé par la flèche.These nozzles provide the injection, for example, of argon to generate a boil, in the liquid steel, within the space of the plunger and the space of the leg to modify the density of the steel and generate the movement as shown in the figures by arrows for circulating the steel from the pocket to the rising plunger 7. The treated steel is then poured back into the pocket by the descending plunger 8, as shown by the arrow.
Selon l'invention, il a été remarqué que l'usure au niveau du joint plan de l'enceinte de l'art antérieur était due à la conception du bas de cuve comportant le jambage, associé aux plongeurs du type amovible sur virole. Or, l'usure apparue dans cette zone avait aussi pour facteur un effet de turbulence de l'acier dû au gaz de circulation injecté dans la partie inférieure du plongeur. Une solution au problème posé a été de déplacer une partie au plan de la jointure en dehors de la zone de turbulence pour retrouver un comportement à l'usure de l'ensemble jambage - plongeur réduit de façon telle, que l'enceinte se comporte comme une enceinte monolithique, avec en plus l'avantage d'avoir une facilité de montage, de démontage et de changement de la seule partie inférieure. Il est à noter que les plongeurs sont sujets à usure importante, notamment en leur partie extrême inférieure, partie en contact avec l'acier de la poche. Un niveau d'usure est représenté en partie hachurée dur les figures 1A et 1B et montre une usure comparable à celle qui se manifeste dans une technique d'enceinte monolithique.According to the invention, it has been noted that the wear at the level of the plane joint of the enclosure of the prior art was due to the design of the bottom of the tank comprising the jamb, associated with the plungers of the removable type on the ferrule. However, the wear and tear that appeared in this zone also had the effect of a turbulence effect on the steel due to the circulation gas injected into the lower part of the plunger. One solution to the problem posed was to move a part at the plane of the joint outside the turbulence zone in order to regain a wear behavior of the leg and plunger assembly reduced in such a way that the enclosure behaves as a monolithic enclosure, with the additional advantage of having ease of assembly, disassembly and change of the single lower part. It should be noted that the divers are subject to significant wear, in particular in their lower end part, part in contact with the steel of the pocket. A level of wear is shown partially hatched in Figures 1A and 1B and shows wear comparable to that which occurs in a monolithic enclosure technique.
Cette amélioration laisse présager une tenue possible sur 150 traitements, l'usure du réfractaire n'étant plus un point de limitation dans le principe. Le gain en terme de tenue est amélioré de 30%. This improvement suggests a possible holding on 150 treatments, the wear of the refractory being no longer a point of limitation in principle. The gain in terms of hold is improved by 30%.

Claims

REVENDICATIONS. CLAIMS.
1. Enceinte (1 ) de traitement sous vide notamment de décarburation d'acier comprenant:1. Enclosure (1) for vacuum treatment, in particular for decarburization of steel, comprising:
- une partie supérieure (2) appelée haut de cuve ayant la forme d'une cloche à vide,- an upper part (2) called the top of the tank having the shape of a vacuum bell,
- une partie inférieure (3), appelée bas de cuve, comportant deux jambages (4) (5) munis de deux plongeurs (7) (8), un plongeur (7) dit montant et un plongeur (8) dit descendant destinés à être immergés dans l'acier de la poche contenant l'acier à traiter, les plongeurs (7) (8) étant associés aux jambages (4) (5) de la cuve au moyen de brides (10) par une jointure (11 ) portant un joint d'étanchéité, les brides (10) permettant le montage et le démontage des plongeurs, caractérisée en ce que la jointure (11) comporte au moins deux plans parallèles (12) (13).- a lower part (3), called bottom of tank, comprising two legs (4) (5) provided with two plungers (7) (8), a plunger (7) said amount and a plunger (8) said descending intended for be immersed in the steel of the ladle containing the steel to be treated, the plungers (7) (8) being associated with the legs (4) (5) of the tank by means of flanges (10) by a joint (11) carrying a seal, the flanges (10) allowing the mounting and dismounting of the plungers, characterized in that the joint (11) comprises at least two parallel planes (12) (13).
2. Enceinte selon la revendication 1 , caractérisée en ce que la jointure (11 ) forme au moins un épaulement (14), assurant un emboîtement du type tenon - mortaise entre le jambage et le plongeur.2. Enclosure according to claim 1, characterized in that the joint (11) forms at least one shoulder (14), ensuring an interlocking of the tenon-mortise type between the jamb and the plunger.
3. Enceinte selon la revendication 1 ou 2, caractérisée en ce que le tenon est réalisé sur la jointure (11 ) du plongeur.3. Enclosure according to claim 1 or 2, characterized in that the post is formed on the joint (11) of the plunger.
4. Enceinte selon l'une des revendications 1 à 3, caractérisée en ce que le tenon est maçonné s'ajustant dans la mortaise du jambage, également maçonnée. 4. Enclosure according to one of claims 1 to 3, characterized in that the post is masonry fitting into the mortise of the jamb, also masonry.
EP02753731A 2001-03-27 2002-03-21 Vacuum chamber, notably for steel decarburisation Expired - Lifetime EP1373584B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0104073 2001-03-27
FR0104073A FR2822849B1 (en) 2001-03-27 2001-03-27 VACUUM PROCESSING ENCLOSURE, IN PARTICULAR FOR STEEL DECARBURIZATION
PCT/FR2002/000987 WO2002077298A2 (en) 2001-03-27 2002-03-21 Vacuum chamber, notably for steel decarburisation

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EP1373584A2 true EP1373584A2 (en) 2004-01-02
EP1373584B1 EP1373584B1 (en) 2005-01-12

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US (1) US20040108634A1 (en)
EP (1) EP1373584B1 (en)
JP (1) JP2004529267A (en)
KR (1) KR20030083754A (en)
CN (1) CN1524129A (en)
AT (1) ATE286988T1 (en)
AU (1) AU2002308021A1 (en)
CA (1) CA2442006A1 (en)
DE (1) DE60202597T2 (en)
ES (1) ES2239243T3 (en)
FR (1) FR2822849B1 (en)
WO (1) WO2002077298A2 (en)

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EP1782826A1 (en) * 2005-11-08 2007-05-09 GBF Gesellschaft für Biotechnologische Forschung mbH PQS and c-diGMP and its conjugates as adjuvants and their uses in pharmaceutical compositions
CN101748246B (en) * 2008-12-15 2012-02-01 鞍钢股份有限公司 Method for improving service life of insert tube of vacuum degassing furnace
JP6226483B2 (en) * 2015-11-16 2017-11-08 Ｊｆｅスチール株式会社 Circulation tube of vacuum degasser

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DE1103950B (en) * 1956-02-21 1961-04-06 Hoerder Huettenunion Ag Device for the continuous degassing of metal, especially steel melts
US3131245A (en) * 1958-03-13 1964-04-28 Heraeus Gmbh W C Immersion pipe for vacuum degassing apparatus
US3203688A (en) * 1961-05-16 1965-08-31 Mc Graw Edison Co Apparatus for degassing molten metal
AT264567B (en) * 1966-09-15 1968-09-10 Oesterr Amerikan Magnesit Delivery of steel degassing vessels and methods of repairing such vessels
US3429565A (en) * 1966-12-23 1969-02-25 Harbison Walker Refractories Metallurgical degasser vessels
US5024421A (en) * 1990-05-08 1991-06-18 Usx Corporation Interlocking snorkel refractory
ES2143647T3 (en) * 1994-07-26 2000-05-16 Veitsch Radex Gmbh GAS SWEEPING DEVICE MOUNTED ON THE BLOWING NOZZLE OF A LOW VACUUM DEGASING TANK.

Non-Patent Citations (1)

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Title
See references of WO02077298A2 *

Also Published As

Publication number Publication date
KR20030083754A (en) 2003-10-30
FR2822849A1 (en) 2002-10-04
US20040108634A1 (en) 2004-06-10
WO2002077298A3 (en) 2003-04-10
ES2239243T3 (en) 2005-09-16
ATE286988T1 (en) 2005-01-15
DE60202597D1 (en) 2005-02-17
FR2822849B1 (en) 2003-12-12
JP2004529267A (en) 2004-09-24
DE60202597T2 (en) 2005-06-16
AU2002308021A1 (en) 2002-10-08
CN1524129A (en) 2004-08-25
EP1373584B1 (en) 2005-01-12
WO2002077298A2 (en) 2002-10-03
CA2442006A1 (en) 2002-10-03

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