EP0065514A1 - Thermally insulating casting tube for metallurgic container. - Google Patents

Thermally insulating casting tube for metallurgic container.

Info

Publication number
EP0065514A1
EP0065514A1 EP80902236A EP80902236A EP0065514A1 EP 0065514 A1 EP0065514 A1 EP 0065514A1 EP 80902236 A EP80902236 A EP 80902236A EP 80902236 A EP80902236 A EP 80902236A EP 0065514 A1 EP0065514 A1 EP 0065514A1
Authority
EP
European Patent Office
Prior art keywords
tube
ring
pouring
nozzle
wall
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
EP80902236A
Other languages
German (de)
French (fr)
Other versions
EP0065514B1 (en
Inventor
Jean-Charles Daussan
Gerard Daussan
Andre Daussan
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.)
Daussan SAS
Original Assignee
Daussan SAS
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 Daussan SAS filed Critical Daussan SAS
Priority to AT80902236T priority Critical patent/ATE13829T1/en
Publication of EP0065514A1 publication Critical patent/EP0065514A1/en
Application granted granted Critical
Publication of EP0065514B1 publication Critical patent/EP0065514B1/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B22D41/502—Connection arrangements; Sealing means therefor

Definitions

  • the present invention relates to a thermally insulating pouring tube intended to be placed between the pouring orifice of a first metallurgical container such as a ladle and a second metallurgical container such as a tundish.
  • the tube material is highly refractory such as silica, magnesia, zirconia, and isostatic pressed carbon.
  • these tubes require long and costly preheating before casting the liquid metal, to limit the risks of solidification of this metal in contact with their wall, this solidification can cause a complete sealing of these tubes.
  • these tubes are heavy, therefore difficult to handle and are very expensive.
  • the organic constituents of the material of these tubes decompose but the cohesion of the tube is maintained as a result of the sintering of the inorganic particles, under the effect of the heat given off when the liquid metal passes through it. inside the tube.
  • the decomposition of organic constituents and the sintering of inorganic particles give the material a porous structure with a high power of thermal insulation.
  • the material tends to crumble quickly, so that at the end of casting, the seal is no longer formed between the pouring tube and the pouring nozzle on which its end is engaged.
  • the object of this invention is therefore to remedy this drawback, by creating a pouring tube having all the advantages of the tubes described in the patent. French n ° 2333 599 while having a considerably extended lifespan.
  • the pouring tube covered by the invention is intended to be placed between the orifice of a first metallurgical container and a second metallurgical container, one end of this pouring tube being intended to be engaged in a removable and substantially watertight on the pouring nozzle or an adapter extending the nozzle of the first container, this pouring tube being made of a material constituted by inorganic particles, erentually added with fibers, coated in a binder, these inorganic particles being sinterable under the effect of heat of the liquid metal passing through this tube.
  • this pouring tube is characterized in that its end intended to be engaged on the pouring nozzle comprises a ring of refractory material, the internal surface of this ring being intended to come into direct contact with the nozzle of couiee or with the adapter extending the nozzle.
  • This refractory ring thus mechanically reinforces the part of the pouring tube which does not undergo the sintering effect indicated in the introduction to this description.
  • this refractory ring does not reduce the insulating properties of the pouring tube and does not entail any risk of solidification of the liquid metal, since this ring does not come into direct contact with this metal.
  • the height of the above-mentioned refractory ring is at least equal to the distance over which the end d tube is intended to be engaged on the pouring nozzle of the first metallurgical container.
  • the pouring tube is produced by molding and the ring of refractory material is fixed to the material of the wall. of the tube, during this molding.
  • the fixing of the refractory ring to the tube can thus be carried out without any additional difficulty.
  • this end of the pouring tube also includes a refractory ring.
  • this end of the pouring tube is not liable to wear out by melting on contact with the liquid metal, and therefore, the life of this tube is further extended.
  • FIG. 1 is a view in partial longitudinal section, of the bottom of a ladle and a tundish placed under the latter, a conformal pour tube the invention being disposed under the outlet nozzle of the ladle
  • FIG. 2 is a partial longitudinal sectional view, on a large scale, showing the upper end of the pouring tube, engaged on the pouring nozzle, as well as the jet of liquid metal passing in this tube,
  • FIGS. 3 to 7 are views in partial long tudinal section, showing various variants of the invention.
  • FIG. 8 is a view in longitudinal section of the lower end of an advantageous version of the pouring tube according to the invention, immersed in the liquid metal contained in the pouring distributor,
  • Figure 9 is a longitudinal sectional view of a pouring tube engaged on an adapter for another nozzle with drawer and Figure 10 is a / Variant in longitudinal section.
  • the bottom of the ladle 1 includes a pouring nozzle 3 made of a highly refractory material such as silica, refractory brick magnesia or zirconia.
  • This pouring nozzle 3 is disposed above a pouring distributor 4.
  • the upper end 5a of a pouring tube 5 slightly truncated, the lower end of which is intended to be immersed in the liquid metal which is introduced into the tundish 4.
  • the means for removable attachment of the coulter tube 5 to the nozzle 3 are not shown. These means can be of the kind described in French patents No. 2,333,599 and No. 77 35,874 of 11/29/1977.
  • the pouring tube 5 comprises an outer protective sleeve 6 made of metal sheet, for example of steel, which surrounds an inner wall 7 made of a thermally insulating and light material. This material consists of inorganic particles (silica, alumina, magnesia), added with inorganic fibers, coated in an organic binder such as a synthetic resin or an inorganic binder.
  • the end 5a of the tube 5 engaged on the pouring nozzle 3 comprises a ring 8 of refractory material, the internal surface 8a of this ring being in direct contact with the casting nozzle e 3.
  • the refractory material of the ring 8 is of the same nature as that of the nozzle 3. It can be, for example, silica, magnesia, refractory brick, isostatically pressed carbon or chamotte. These materials all have the advantage of having excellent mechanical and thermal resistance. In addition, they have a very high dimensional stability, so that it is possible to obtain a very precise adjustment of the ring 8 on the nozzle 3.
  • the height of the refractory ring / is greater than the distance over which the end 5a of the tube 5 is engaged on the pouring nozzle 3.
  • the thickness of the wall of the refractory ring 8 is substantially equal to the thickness of the wall 7 of the tube 5, so that the inner Sa and outer surfaces of the ring 8 are located substantially in the extension inner 7a and outer surfaces of the wall 7 of the tube 5.
  • the thermally insulating wall 7 is obtained by molding in a mold, the outer wall of which is formed by the sheet 6. This molding makes it possible to obtain direct adhesion of the material of the wall 7 to the sheet 6. In addition, the direct connection between the material of the wall 7 and the refractory ring 3 can also be obeyed during this molding. However, other means of fi xati on the ring 8 can be provided for than the sheet 6 and / or to the insulating wall 7, such as screws, cement or glue. In the variant embodiment of the figure, the contact surface between the refractory ring 9 and the insulating material constituting the wall 7 of the pouring tube comprises an annular recess 10.
  • this annular step 10 makes it possible to maintain a certain thermal insulation in the part 7b of the wall 7.
  • the thickness / of the ring 11 is less than that of the wall 7 of the. tube, the inner surface 11a of this ring 11 being disposed substantially in the extension of the internal surface 7a of the wall 7.
  • This ring 11 is thus entirely embedded in an annular recess 7c formed at the end of the tube. This arrangement is favorable as regards the solidity of the fixing of the ring 11 to the wall 7 and the thermal insulation in line with the ring 11 in the part 7d.
  • the refractory ring 12 has an internal diameter smaller than the internal diameter of the tube and the external surface 12a of this ring is arranged in the extension of the internal surface 7a of the tube. The fixing of this ring 12 in the tube is ensured by the interlocking which results from the taper of the outer surface
  • This fixing can possibly be reinforced by gluing or other suitable mechanical means.
  • the ring re fraction 13 has an outside diameter greater than the inside diameter of the tube and this ring is partly embedded in an annular shoulder 13a formed in the wall 7.
  • the refractory ring 14 presents at the upper part of its inner surface an annular widening 14a, receiving the free end of the nozzle 3.
  • the shoulder 14b constitutes a stop which ensures perfect axial positioning of the tube with respect to the nozzle, avoiding any risk of relative jamming between the nozzle and the ring 14.
  • the rings according to the invention undergo no chemical transformation.
  • these rings are made of a refractory material of the same nature as that of the nozzle 3, these rings undergo thermal expansion comparable to that of the nozzle 3. so that no play is formed between these rings and the nozzle.
  • the junction thus remains perfectly sealed and any possible introduction of air inside the tube is avoided. and any risk of oxidation of the liquid metal.
  • the zone 16b of the wall 7 of the tube 5 would be completely decomposed and this would necessarily result in a significant annular clearance between the upper part of the wall 7 of the tube and the nozzle 3. This play would thus allow the introduction of air inside the tube and consequently, the oxidation of the liquid metal, so that this tube would no longer be usable for a new casting.
  • the decomposition of the zone 16b of the wall 7 of the tube 5 does not cause any drawback, since the ring 8 ensures at the end of casting, as at the beginning of it, a perfect seal between the nozzle 3 and the tube 5.
  • the part of the wall 7 located below the zone 16b remains perfectly coherent and retains a high power of thermal insulation due to the porous structure obtained by sintering .
  • the tube according to the invention remains useful. readable for several successive flows.
  • the outer sheet 6 melts in contact with the liquid metal and the same applies to the material of the wall 7 of the tube. This can also prevent the reuse of the pouring tube 5.
  • This ring 16 corresponds at least to the depth of immersion of the end of the pouring tube in the metal 17 contained in the tundish distributor.
  • the thickness of the wall of this ring 16 is substantially equal to the thickness of the wall 7 of the tube, plus that of the sheet 6. This sheet 6 completely covers the wall 7 of the tube and stops at the level of the ring 16 to avoid direct contact with the liquid metal 17.
  • the ring 16 can be fixed to the wall 7 of the tube 5 during the molding of this wall, as in the case of the upper rings shown in FIGS. 1 to 7.
  • the fixing of this ring 16 to the wall 7 is improved when the contact surface of this attachment has an annular recess 16a as shown in FIG. 8.
  • the end of the tube 5 does not risk being damaged in contact with the liquid metal 17, and therefore, this tube can be reused for several successive castings.
  • an adapter 18 is interposed between a short nozzle 19, and the pouring tube 5, as indicated in FIG. 9.
  • This nozzle 19 is part of the drawer 20 of a system of 'opening and closing called "drawer nozzle" of the orifice of a ladle.
  • the adapter 18 made of refractory material has at its upper part an annular cavity 21 which receives the end of the nozzle 19.
  • the frustoconical lower end 18a of the adapter 18 is nested in the interior surface 11a of a refractory ring 11.
  • the refractory ring 11 plays the same role with respect to the adapter 13 as with respect to the pouring nozzle 3 in the case of the preceding embodiments.
  • This adapter 18 is necessary in all cases where the pouring nozzle is too short. This adapter 18 sometimes also acts as a box for collecting the gases intended to be blown into the liquid steel.
  • the shape and method of attachment of the upper refractory ring can be modified to suit all possible shapes of nozzles, provided that the inner surface of the ring is in direct contact with the outer surface of the nozzle.
  • the shape and the method of fixing the lower year 16 can be modified, provided that the liquid metal contained in the tundish does not come into direct contact with the insulating wall 7 and with the external sheet 6.
  • the pouring tube according to the invention can be used for other metallurgical vessels than the ladles and the tundish.
  • the outer sheet it is advantageous that the outer sheet
  • annular bead 22 projecting outwards (see FIG. 2) defining an empty annular space 23 between the sheet and the thermally insulating inner wall 7.
  • This bead 22 serves to hold, by means of a support 24, the tube 5 in abutment against the external surface of the nozzle 3.
  • the empty annular space 23 communicates with a horizontal tube 25 connected to a source of non-oxidizing or inert gas such as argon.
  • This bead 22. is preferably arranged opposite the non-sinterable zone 16b adjacent to the annea 8 of the wall 7, which remains porous.
  • the gas introduced into the annular space 19 diffuses through the wall 7, in a regular manner, all around the latter and penetrates the interior of the tube 7, providing the liquid metal with additional protection against the oxidation.
  • the external sheet 6 has at its upper part a second annular bead, constituted by a winding 26 from the edge of the sheet towards the inside.
  • This winding 26 is supported on the adjacent end of the insulating wall 7.
  • This winding 26 defines an annular duct communicating with an intake manifold 28 of inert gas such as argon. Winding 26 presents a series of openings 27 directed radially towards the axis of the tube 5.
  • the advantage of this arrangement is as follows: since the ring 8 is made of hard refractory material, this material is liable to flake when it is brought too suddenly into contact with the refractory and hard material of the same kind as the nozzle 3 or the extension 19.
  • the scales thus formed can generate air inlets inside the pouring tube 5, by suction (Venturi effect).
  • the winding 26 provided with openings 27 makes it possible to produce jets of argon or other inert gas all around the nozzle 3, thus avoiding any penetration of air inside the tube 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Thermal Insulation (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Insulating Bodies (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Continuous Casting (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

A heat insulating casting tube is disposed between the outlet orifice of a first metallurgical vessel and a second metallurgical vessel. One end of the casting tube has a removable and substantially leaktight engagement about a casting nozzle or an adapter forming an extension of the nozzle of the first vessel. The casting tube is formed of a material sinterable under the action of the heat of the liquid metal as it flows in the tube. A ring of refractory material is disposed on the tube end engaged on and surrounding the lateral surface of the casting nozzle or adapter. The internal surface of this ring is shaped as the lateral surface of the casting nozzle or adapter and has a substantially leaktight engagement with that lateral surface. The height of the ring is such that its bottom edge is located above the zone in which the liquid metal which is poured into the tube would be liable to come into contact with the internal surface of the tube.

Description

"Tubedecoulée t hermiquement isolant pour récipient métallurgique" "Hermetically sealed t pipe for metallurgical container"
La présente invention concerne un tube de coulée thermiquement isolant destiné à être placé entre l'orifice de coulée d'un premier récipient métallurgique telle qu'une poche de coulée et un second récipient métallurgique tel qu'un répartiteur de coulée.The present invention relates to a thermally insulating pouring tube intended to be placed between the pouring orifice of a first metallurgical container such as a ladle and a second metallurgical container such as a tundish.
Les tubes de coulée connus sont réalisés en différentes catégories de matériaux.Known pouring tubes are produced in different categories of materials.
Dans l'une de ces catégories, le matériau des tubes est hautement réfractaire tel que la silice, la magnésie, la zircone, et le carbone pressé isostatique ment.In one of these categories, the tube material is highly refractory such as silica, magnesia, zirconia, and isostatic pressed carbon.
Ces matériaux présentent l'avantage d'avoir une résistance mécanique et à la chaleur remarquable, de sorte que les tubes réalisés dans de tels matériaux ont une durée de vie très longue.These materials have the advantage of having remarkable mechanical and heat resistance, so that the tubes produced in such materials have a very long service life.
Les inconvénients de ces matériaux sont cependant nombreux.The disadvantages of these materials are however numerous.
En premier lieu, en raison de leur mauvais pouvoir isolant thermique et/ou pour éviter leur éclateme ces tubes nécessitent un préchauffage long et coûteux avant d'effectuer la coulée du métal liquide, pour limiter les risques de solidification de ce métal au contact de leur paroi, cette solidification pouvant engendrer une obturation complète de ces tubes. Secondairement, ces tubes sont lourds, donc difficiles à manipuler et sont très onéreux.Firstly, due to their poor thermal insulating power and / or to avoid their bursting, these tubes require long and costly preheating before casting the liquid metal, to limit the risks of solidification of this metal in contact with their wall, this solidification can cause a complete sealing of these tubes. Secondarily, these tubes are heavy, therefore difficult to handle and are very expensive.
Pour remédier aux inconvénients précités, la demanderesse a décrit dans son brevet français n° 2 333 un tube de coulée en matériau isolant thermique constitué par des particules inorganiques réfractaires (silice, alumine, magnésie) éventuellement additionnées de fibres minérales ou organiques, ces particules et fibres étant enrobées dans un liant organique ou inorganique.To remedy the aforementioned drawbacks, the applicant has described in its French patent No. 2 333 a pouring tube made of thermal insulating material consisting of refractory inorganic particles (silica, alumina, magnesia) possibly added with mineral or organic fibers, these particles and fibers being coated in an organic or inorganic binder.
En rai son des propriétés isolantes remarquables de ce matériau, de tels tubes ne nécessitent aucun préchauf fage. De plus, ces tubes sont légers donc faciles à manipuler et peu onéreux.Because of its remarkable insulating properties of this material, such tubes require no preheating. In addition, these tubes are light and therefore easy to handle and inexpensive.
Lors de la coulée de l'acier liquide, les constituants organiques du matériau de ces tubes se décomposent mais la cohésion du tube est maintenue par suite du frittage des particules inorganiques, sous l'effet de la chaleur dégagée au passage du métal liquide à l'intérieur du tube. La décomposition des constituants organiques et le frittage des particules inorganiques confèrent au matériau une structure poreuse présentant un haut pouvoir d'isolation thermique.During the casting of the liquid steel, the organic constituents of the material of these tubes decompose but the cohesion of the tube is maintained as a result of the sintering of the inorganic particles, under the effect of the heat given off when the liquid metal passes through it. inside the tube. The decomposition of organic constituents and the sintering of inorganic particles give the material a porous structure with a high power of thermal insulation.
Cependant, à l'extrémité supérieure de ces tubes par laquelle ils sont engagés dans la busette de la poche de coulée, le frittage précité n'a pas lieu car le matériau du tube n'est à cet endroit, pas en contact direct avec le jet de métal liquide.However, at the upper end of these tubes by which they are engaged in the nozzle of the ladle, the aforementioned sintering does not take place because the material of the tube is at this location, not in direct contact with the liquid metal spray.
De ce fait, à cette extrémité, le matériau a tendance à s'effriter rapidement, de sorte qu'en fin de coulée, l'étanchéité n'est plus réalisée entre le tube de coulée et la busette de coulée sur laquelle son extrémité est engagée.Therefore, at this end, the material tends to crumble quickly, so that at the end of casting, the seal is no longer formed between the pouring tube and the pouring nozzle on which its end is engaged.
Ce défaut d'étanchéité risque alors de permettre l'introduction d'air à l'intérieur du tube, par effet d'aspiration, ce qui est susceptible de former des inclusions d'oxydes au sein du métal. De ce fait, de tels tubes de coulée deviennent généralement inutilisables après une seule opération de coulée. La constatation de cet inconvénient est à la base de la présente invention.This leakage then risks allowing the introduction of air inside the tube, by suction effect, which is likely to form inclusions of oxides within the metal. As a result, such pouring tubes generally become unusable after a single casting operation. The finding of this drawback is the basis of the present invention.
Le but de cette invention est donc de remédier à cet inconvénient, en créant un tube de coulée présentant tous les avantages des tubes décrits dans le brevet français n° 2333 599 tout en ayant une durée de vie considérablement prolongée.The object of this invention is therefore to remedy this drawback, by creating a pouring tube having all the advantages of the tubes described in the patent. French n ° 2333 599 while having a considerably extended lifespan.
Le tube de coulée visé par l'invention est destiné à être placé entre l'orifice d'un premier récipient métallurgique et un second récipient métallurgique, l'une des extrémités de ce tube de coulée étant destinée à être engagée de façon amovible et sensiblement étanche sur la busette de coulée ou un adaptateur prolongeant la busette du premier récipient, ce tube de coulée étant en unmatériau constitué par des particules inorganiques, érentuellement additionnées de fibres, enrobées dans un liant, ces particules inorganiques étant frittables sous l'effet de la chaleur du métal liquide passant dans ce tube.The pouring tube covered by the invention is intended to be placed between the orifice of a first metallurgical container and a second metallurgical container, one end of this pouring tube being intended to be engaged in a removable and substantially watertight on the pouring nozzle or an adapter extending the nozzle of the first container, this pouring tube being made of a material constituted by inorganic particles, erentually added with fibers, coated in a binder, these inorganic particles being sinterable under the effect of heat of the liquid metal passing through this tube.
Suivant l'invention, ce tube de coulée est caractérisé en ce que son extrémité destinée à être engagée sur la busette de coulée comporte un anneau en matériau réfractaire, la surface interne de cet anneau étant destinée à venir en contact direct avec la busette de couiée ou avec l'adaptateur prolongeant la busette. Cet anneau réfractaire renforce ainsi mécaniquement la partie du tube de coulée qui ne subit pas l'effet de frittage signalé dans l'introduction de cette description.According to the invention, this pouring tube is characterized in that its end intended to be engaged on the pouring nozzle comprises a ring of refractory material, the internal surface of this ring being intended to come into direct contact with the nozzle of couiee or with the adapter extending the nozzle. This refractory ring thus mechanically reinforces the part of the pouring tube which does not undergo the sintering effect indicated in the introduction to this description.
Grâce à cet anneau réfractaire, l'étanchéité entre le tube et la busette de coulée reste excellente mise après plusieurs opérations successives de coulée.Thanks to this refractory ring, the seal between the tube and the pouring nozzle remains excellent after several successive casting operations.
De plus, cet anneau réfractaire ne réduit pas les propriétés isolantes du tube de coulée et n'entraine aucun risque de solidification du métal liquide, car cet anneau ne vient pas en contact direct avec ce métal.In addition, this refractory ring does not reduce the insulating properties of the pouring tube and does not entail any risk of solidification of the liquid metal, since this ring does not come into direct contact with this metal.
Selon une version avantageuse de l'invention, la hauteur de l'anneau réfractaire précité est au mo ins égale à la distance suivant laquelle l'extrémité d tube est destinée à être engagée sur la busette de coulée du premier récipient métallurgique.According to an advantageous version of the invention, the height of the above-mentioned refractory ring is at least equal to the distance over which the end d tube is intended to be engaged on the pouring nozzle of the first metallurgical container.
L'étanchéité entre le tube de coulée et la busette sont ainsi maintenues dans d'excellentes conditions Selon une version préférée de l'invention, le tube de coulée est réalisé par moulage et l'anneau en matériau réfractaire est fixé au matériau de la paroi du tube, lors de ce moulage.The seal between the pouring tube and the nozzle are thus maintained in excellent conditions. According to a preferred version of the invention, the pouring tube is produced by molding and the ring of refractory material is fixed to the material of the wall. of the tube, during this molding.
La fixation de l'anneau réfractaire au tube peut ainsi être réalisée sans aucune difficulté complémentaire.The fixing of the refractory ring to the tube can thus be carried out without any additional difficulty.
Etant donné que l'extrémité du tube de coulée opposée à la busette de coulée est destinée généralement à plonger dans le métal liquide qui est déversé dans le second récipient métallurgique, il est avantageux que cette extrémité du tube de coulée comporte également un anneau réfractaire.Since the end of the pouring tube opposite the pouring nozzle is generally intended to immerse in the molten metal which is poured into the second metallurgical vessel, it is advantageous that this end of the pouring tube also includes a refractory ring.
Ainsi, cette extrémité da tube de coulée ne risque pas de s'user par fusion au contact du métal liquide, et de ce fait, on prolonge encore davantage la durée de vie de ce tube.Thus, this end of the pouring tube is not liable to wear out by melting on contact with the liquid metal, and therefore, the life of this tube is further extended.
D'autres particularités et avantages de l'invention apparaîtront encore dans la description ci-après.Other features and advantages of the invention will appear in the description below.
Aux dessins annexés, donnés à titre d'exemples non limitatifs: - la figure 1 est une vue en coupe longitudinale partielle, du fond d'une poche de coulée et d'un répartiteur de coulée placé sous cette dernière, un tube de coulée conforme à l'invention étant disposé sous la busette de sortie de la poche de coulée, - la figure 2 est une vue en coupe longitudinale partielle, à grande échelle, montrant l'extrémité supérieure du tube de coulée, engagée sur la busette de coulée, ainsi que le jet de métal liquide passant dans ce tube,In the accompanying drawings, given by way of nonlimiting examples: - Figure 1 is a view in partial longitudinal section, of the bottom of a ladle and a tundish placed under the latter, a conformal pour tube the invention being disposed under the outlet nozzle of the ladle, - Figure 2 is a partial longitudinal sectional view, on a large scale, showing the upper end of the pouring tube, engaged on the pouring nozzle, as well as the jet of liquid metal passing in this tube,
- les figures 3 à 7 sont des vues en coupe long tudinale partielle, montrant diverses variantes de l'invention,FIGS. 3 to 7 are views in partial long tudinal section, showing various variants of the invention,
- la figure 8 est une vue en coupe longitudinal de l'extrémité inférieure d'une version avantageuse du tube de coulée conforme à l'invention, plongeant dans le métal liquide contenu dans le répartiteur de coulée,FIG. 8 is a view in longitudinal section of the lower end of an advantageous version of the pouring tube according to the invention, immersed in the liquid metal contained in the pouring distributor,
- la figure 9 est une vue en coupe longitudinal d'un tube de coulée engagé sur un adaptateur pour busette autre à tiroir et la figure 10 est une/Variante en coupe longitudinale.- Figure 9 is a longitudinal sectional view of a pouring tube engaged on an adapter for another nozzle with drawer and Figure 10 is a / Variant in longitudinal section.
Dans la réalisation selon la figure 1 , le fond de la poche de coulée 1 comporte une busette de coulée 3 en un matériau hautement réfractaire tel que silice, magnésie brique réfractaire ou zircone. Cette busette de coulée 3 est disposée au-dessus d'un répartiteur de coulée 4. Autour de cette busette 3, est engagée de façon amovible, l'extrémité supérieure 5a d'un tube de coulée 5, légèrement tronoonique dont l'extrémité inférieure est destinée a être immergée dans le métal liquide qui est introduit dans le répartiteur de coulée 4.In the embodiment according to FIG. 1, the bottom of the ladle 1 includes a pouring nozzle 3 made of a highly refractory material such as silica, refractory brick magnesia or zirconia. This pouring nozzle 3 is disposed above a pouring distributor 4. Around this nozzle 3 is engaged in a removable manner, the upper end 5a of a pouring tube 5, slightly truncated, the lower end of which is intended to be immersed in the liquid metal which is introduced into the tundish 4.
Les moyens de fixation amovible du tube de coul 5 à la busette 3, ne sont pas représentés. Ces moyens peuvent être du genre de ceux décrits dans les brevets français n° 2 333 599 et n° 77 35 874 du 29/11/1977. Le tube de coulée 5 comporte un manchon extérieur de protection 6 en tôle métallique, par exemple d'acier, qui entoure une paroi intérieure 7 en un matériau thermiquement isolant et léger. Ce matériau est constitué par des particules inorganiques (silice, alumine, magnésie), additionnées de fibres inorganiques, enrobées dans un liant organique telle qu'une résine synthétique ou encore un liant inorganique. La composition de ce matériau est telle que les particules inorganiques frittent sous l'effet de la chaleur dégagée par la métal en fusion qui est coulé dans le tube, ce qui permet de maintenir la cohésion et les propriétés isolantes de ce matériau, malgré la décomposition des composants organiques de celui-ci. Conformément à, l'invention, l'extrémité 5a du tube 5 engagée sur la busette de coulée 3, comporte un anneau 8 en matière réfractaire, la surface interne 8a de cet anneau étant en contact direct avec la busette de coulé e 3. La matière réfractaire de l'anneau 8 est de même nature que celle de la busette 3. Il peut s'agir par exemple, de silice, magnésie, brique réfractaire, carbone pressé isostatiquement ou chamotte. Ces matériaux présentent tous l'avantage d'avoir une excellente résistance mécanique et thermique. De plus, ils présentent une très grande stabilité dimensionnelle, de sorte qu'il est possible d'obtenir un ajustement très précis de l'anneau 8 sur la busette 3.The means for removable attachment of the coulter tube 5 to the nozzle 3 are not shown. These means can be of the kind described in French patents No. 2,333,599 and No. 77 35,874 of 11/29/1977. The pouring tube 5 comprises an outer protective sleeve 6 made of metal sheet, for example of steel, which surrounds an inner wall 7 made of a thermally insulating and light material. This material consists of inorganic particles (silica, alumina, magnesia), added with inorganic fibers, coated in an organic binder such as a synthetic resin or an inorganic binder. The composition of this material is such that the inorganic particles sinter under the effect of the heat given off by the molten metal which is poured into the tube, which makes it possible to maintain the cohesion and the insulating properties of this material, despite the decomposition of the organic components thereof. According to the invention, the end 5a of the tube 5 engaged on the pouring nozzle 3 comprises a ring 8 of refractory material, the internal surface 8a of this ring being in direct contact with the casting nozzle e 3. The refractory material of the ring 8 is of the same nature as that of the nozzle 3. It can be, for example, silica, magnesia, refractory brick, isostatically pressed carbon or chamotte. These materials all have the advantage of having excellent mechanical and thermal resistance. In addition, they have a very high dimensional stability, so that it is possible to obtain a very precise adjustment of the ring 8 on the nozzle 3.
Dans la réalisation selon gles figures 1 et 2, la hauteur de l'anneau réfractaire/est supérieure à la distance suivant laquelle l'extrémité 5a du tube 5 est engagée sur la busette de coulée 3.In the embodiment according to FIGS. 1 and 2, the height of the refractory ring / is greater than the distance over which the end 5a of the tube 5 is engaged on the pouring nozzle 3.
De plus, l'épaisseur de la paroi de l'anneau réfractaire 8 est sensiblement égale à l'épaisseur de la paroi 7 du tube 5, de sorte que les surfaces intérieure Sa et extérieure de l'anneau 8 sont situées sensiblement dans le prolongement des surfaces intérieure 7a et extérieure de la paroi 7 du tube 5.In addition, the thickness of the wall of the refractory ring 8 is substantially equal to the thickness of the wall 7 of the tube 5, so that the inner Sa and outer surfaces of the ring 8 are located substantially in the extension inner 7a and outer surfaces of the wall 7 of the tube 5.
La paroi thermiquement isolante 7 est obtenue par moulage dans un moule dont la paroi extérieure est constituée par la tôle 6. Ce moulage permet d'obtenir une adhérence directe du matériau de la paroi 7 avec la tôle 6. De plus, la liaison directe entre le matériau de la paroi 7 et l'anneau réfractaire 3 peut également être ob tenue lors de ce moulage . On peut néanmoi ns prévoir d' autres moyens de fi xati on de l ' anneau 8 à que la tôle 6 et/ou à la paroi isolante 7 , tels/vis , ciment ou colle. Dans la variante de réalisation de la figure la surface de contact entre l'anneau réfractaire 9 et le matériau isolant constituant la paroi 7 du tube de coulée comporte un décrochement annulaire 10. L ' anneauThe thermally insulating wall 7 is obtained by molding in a mold, the outer wall of which is formed by the sheet 6. This molding makes it possible to obtain direct adhesion of the material of the wall 7 to the sheet 6. In addition, the direct connection between the material of the wall 7 and the refractory ring 3 can also be obeyed during this molding. However, other means of fi xati on the ring 8 can be provided for than the sheet 6 and / or to the insulating wall 7, such as screws, cement or glue. In the variant embodiment of the figure, the contact surface between the refractory ring 9 and the insulating material constituting the wall 7 of the pouring tube comprises an annular recess 10. The ring
9 est ainsi emboîté sur la paroi 7, ce qui améliore la liaison mécanique entre cette paroi 7 et l'anneau9 is thus fitted onto the wall 7, which improves the mechanical connection between this wall 7 and the ring
9 obtenue lors du moulage. De plus, ce décrochement annulaire 10 permet de maintenir une certaine isolation thermique dans la partie 7b de la paroi 7.9 obtained during molding. In addition, this annular step 10 makes it possible to maintain a certain thermal insulation in the part 7b of the wall 7.
Dans la version représentée sur la figure de la paroi 4, l'épaisseur/ de l'anneau 11 est inférieure a celle de la paroi 7 du. tube, la.surf.ace intérieure 11a de cet anneau 11 étant disposée sensiblement dans le prolongement de la surface intérieure 7a de la paroi 7. Cet anneau 11 est ainsi entièrement encastré dans un évidement annulaire 7c ménagé à l'extrémité du tube. Cette dispositio est favorable en ce qui concerne la solidité de la fixation de l'anneau 11 à la paroi 7 et l'isolation thermique au droit de l'anneau 11 dans la partie 7d.In the version shown in the figure of the wall 4, the thickness / of the ring 11 is less than that of the wall 7 of the. tube, the inner surface 11a of this ring 11 being disposed substantially in the extension of the internal surface 7a of the wall 7. This ring 11 is thus entirely embedded in an annular recess 7c formed at the end of the tube. This arrangement is favorable as regards the solidity of the fixing of the ring 11 to the wall 7 and the thermal insulation in line with the ring 11 in the part 7d.
Dana la réalisation de la figure 5, l'anneau réfractaire 12 a un diamètre intérieur inférieur au diamètre intérieur du tube et la surface extérieure 12a de cet anneau est disposée dans le prolongement de la surface intérieure 7a du tube. La fixation de cet anneau 12 dans le tube est assurée par l'emboîtement qui résulte de la conicité de la surface extérieureIn the embodiment of FIG. 5, the refractory ring 12 has an internal diameter smaller than the internal diameter of the tube and the external surface 12a of this ring is arranged in the extension of the internal surface 7a of the tube. The fixing of this ring 12 in the tube is ensured by the interlocking which results from the taper of the outer surface
7a 12a de l'anneau 12 et de la surface intérieure/ du tube.7a 12a of the ring 12 and of the inner surface / of the tube.
Cette fixation peut être renforcée éventuellement par collage ou autres moyens mécaniques appropriés.This fixing can possibly be reinforced by gluing or other suitable mechanical means.
Dans la variante de la figure 6, l'anneau ré fractaire 13 présente un diamètre extérieur supérieur au diamètre intérieur du tube et cet anneau est en partie encastré dans un épaulement annulaire 13a ménagé dans la paroi 7. Dans la réalisation de la figure 7, l'anneau réfractaire 14 présente à la partie supérieure de sa surface intérieure un élargissement annulaire 14a, recevant l'extrémité libre de la busette 3. Cette disposition améliore l'étanchéité entre la partie supérieure du tube et la busette 3. De plus, l'épaulement 14b constitue une butée qui assure un parfait positionnement axial du tube par rapport à la busette en évitant tout risque de coincement relatif entre la busette et l'anneau 14. Les réalisations précitées présentent en commun les avantages techniques ci-après:In the variant of Figure 6, the ring re fraction 13 has an outside diameter greater than the inside diameter of the tube and this ring is partly embedded in an annular shoulder 13a formed in the wall 7. In the embodiment of FIG. 7, the refractory ring 14 presents at the upper part of its inner surface an annular widening 14a, receiving the free end of the nozzle 3. This arrangement improves the seal between the upper part of the tube and the nozzle 3. In addition, the shoulder 14b constitutes a stop which ensures perfect axial positioning of the tube with respect to the nozzle, avoiding any risk of relative jamming between the nozzle and the ring 14. The above-mentioned embodiments have the following technical advantages in common:
En premier lieu, coopte tenu des propriétés mécaniques du matériau réfractaire constituant les anneau 3, 9, 11, 12, 13 et 14, il est possible d'obtenir un ajustement très précis entre la surface intérieure de ces anneaux et la surface extérieure de la busette 3.Firstly, given the mechanical properties of the refractory material constituting the rings 3, 9, 11, 12, 13 and 14, it is possible to obtain a very precise adjustment between the inner surface of these rings and the outer surface of the nozzle 3.
D'autre part, compte tenu de la haute résistance à l'abrasion de ces anneaux, une parfaite étanchéité entre ceux-ci et la busette 3 est maintenue même après plusieurs mises en place successives des tubes sur la busette.On the other hand, given the high abrasion resistance of these rings, a perfect seal between them and the nozzle 3 is maintained even after several successive placement of the tubes on the nozzle.
En cours de coulée, les anneaux conformes à l'invention ne subissent aucune transformation, chimique. généralement De plus, étant donné que ces anneaux sont réalisés/en un matériau réfractaire de même nature que celui de la busette 3, ces anneaux subissent une dilatation thermique comparable à celle de la busette 3. de sorte qu'aucun jeu n'est formé entre ces anneaux et la busette. La jonction reste ainsi parfaitement étanche et on évite toute introduction possible d'air à l'intérieur du tube et tout risque d'oxydation du métal liquide.During casting, the rings according to the invention undergo no chemical transformation. generally In addition, since these rings are made of a refractory material of the same nature as that of the nozzle 3, these rings undergo thermal expansion comparable to that of the nozzle 3. so that no play is formed between these rings and the nozzle. The junction thus remains perfectly sealed and any possible introduction of air inside the tube is avoided. and any risk of oxidation of the liquid metal.
Lors de la coulée, le diamètre du jet de métal liquide 15 (voir figure 2) qui s'écoule de la busette 3 est freiné du fait du rétrécissement progressif dudiametre intérieur du tube 5, ce qui a pour conséquence un élargissement du jet 15 à sa partie supérieure 15a. Le contact entre le jet de métal liquide 15 et la paroi du tube 5 entraîne un frittage du matériau constituant cette paroi. Ce frittage assure le maintien de la cohésion mécanique de ce matériau au cours de la coulée. Ce frittage n'a cependant pas lieu dans la zone 16b de la paroi 7 proche de la busette 3, car celle-ci n'est pas en contact direct avec le jet de métal 15, comme on peut le voir sur la figure 2. Cette zone 16b a ainsi tendance à s'effriter du fait de la décomposition du liant sous l'effet de la chaleur. Ainsi, en l'absence de l'anneau réfractaire 3, en fin de coulée, la zone 16b de la paroi 7 du tube 5 serait complètement décomposée et il en résulterait nécessairement un jeu annulaire important entre la partie supérieure de la paroi 7 du tube et la busette 3. Ce jeu permettrait ainsi l'introduction de l'air à l'intérieur du tube et par suite, l'oxydation du métal liquide, de sorte que ce tube ne serait plus utilisable pour une nouvelle coulée. Dans le cas de l'invention, la décomposition de la zone 16b de la paroi 7 du tube 5 n'entraîne aucun inconvénient, car l'anneau 8 assure en fin de coulée, comme au début de celle-ci, une parfaite étanchéité entre la busette 3 et le tube 5. De plus, en fin de coulée, la partie de la paroi 7 située en dessous de la zone 16b reste parfaitement cohérente et conserve un haut pouvoir d'isolation thermique du fait de la structure poreuse obtenue par frittage.During casting, the diameter of the liquid metal jet 15 (see FIG. 2) which flows from the nozzle 3 is braked due to the gradual narrowing of the inside diameter of the tube 5, which results in a widening of the jet 15 to its upper part 15a. The contact between the jet of liquid metal 15 and the wall of the tube 5 causes sintering of the material constituting this wall. This sintering maintains the mechanical cohesion of this material during casting. This sintering does not however take place in the zone 16b of the wall 7 close to the nozzle 3, because the latter is not in direct contact with the metal jet 15, as can be seen in FIG. 2. This zone 16b thus tends to crumble due to the decomposition of the binder under the effect of heat. Thus, in the absence of the refractory ring 3, at the end of casting, the zone 16b of the wall 7 of the tube 5 would be completely decomposed and this would necessarily result in a significant annular clearance between the upper part of the wall 7 of the tube and the nozzle 3. This play would thus allow the introduction of air inside the tube and consequently, the oxidation of the liquid metal, so that this tube would no longer be usable for a new casting. In the case of the invention, the decomposition of the zone 16b of the wall 7 of the tube 5 does not cause any drawback, since the ring 8 ensures at the end of casting, as at the beginning of it, a perfect seal between the nozzle 3 and the tube 5. In addition, at the end of casting, the part of the wall 7 located below the zone 16b remains perfectly coherent and retains a high power of thermal insulation due to the porous structure obtained by sintering .
Ainsi, le tube conforme à l'invention reste uti lisable pour plusieurs coulées successives.Thus, the tube according to the invention remains useful. readable for several successive flows.
Lorsque l'extrémité du tube 5 est destinée à plonger dans le métal liquide, qui est coulé dans le répartiteur de coulée 4, la tôle extérieure 6 fond au contact du métal liquide et il en est de même pour le matériau de la paroi 7 du tube. Ceci peut également empêcher la réutilisation du tube de coulée 5.When the end of the tube 5 is intended to immerse in the liquid metal, which is poured into the tundish 4, the outer sheet 6 melts in contact with the liquid metal and the same applies to the material of the wall 7 of the tube. This can also prevent the reuse of the pouring tube 5.
Pour remédier à ce problème, il est avantageux de munir l'extrémité libre du tube 5, d'un autre anneau 16 en matériau réfractaire résistant au contact du mé tal liquide 17, comme indiqué sur la figure 8.To remedy this problem, it is advantageous to provide the free end of the tube 5 with another ring 16 made of refractory material resistant to contact with liquid metal 17, as shown in FIG. 8.
La hauteur de cet anneau 16 correspond au moins à la profondeur d'immersion de l'extrémité du tube de coulée dans le métal 17 contenu dans le réparti teur de coulée.The height of this ring 16 corresponds at least to the depth of immersion of the end of the pouring tube in the metal 17 contained in the tundish distributor.
Dans la réalisation représentée, l'épaisseur de la paroi de cet anneau 16 est sensiblement égale à l'épaisseur de la paroi 7 du tube, plus celle de la tôle 6. Cette tôle 6 recouvre entièrement la paroi 7 du tube et s'arrête au niveau de l'anneau 16 pour éviter tout contact direct avec le métal liquide 17.In the embodiment shown, the thickness of the wall of this ring 16 is substantially equal to the thickness of the wall 7 of the tube, plus that of the sheet 6. This sheet 6 completely covers the wall 7 of the tube and stops at the level of the ring 16 to avoid direct contact with the liquid metal 17.
L'anneau 16 peut être fixé à la paroi 7 du tube 5 lors du moulage de cette paroi, comme dans le cas des anneaux supérieurs représentés sur les figures 1 à 7. La fixation de cet anneau 16 à la paroi 7 est améliorée lorsque la surface de contact de cette fixation comporte un décrochement annulaire 16a comme indiqué sur la figure 8.The ring 16 can be fixed to the wall 7 of the tube 5 during the molding of this wall, as in the case of the upper rings shown in FIGS. 1 to 7. The fixing of this ring 16 to the wall 7 is improved when the contact surface of this attachment has an annular recess 16a as shown in FIG. 8.
Grâce à l'anneau réfractaire 16, l'extrémité du tube 5 ne risque pas d'être détériorée au contact du métal liquide 17, et de ce fait, ce tube peut être réutilisé pour plusieurs coulées successives.Thanks to the refractory ring 16, the end of the tube 5 does not risk being damaged in contact with the liquid metal 17, and therefore, this tube can be reused for several successive castings.
Bien entendu, l'invention n'est pas limitée aux exemples que l'on vient de décrire et on peut apporter à ceux-ci de nombreuses modifications sans sortir du cadre de l'invention.Of course, the invention is not limited to the examples which have just been described and it is possible to bring numerous modifications to these without departing from the scope of the invention.
Ainsi l'invention peut également s'appliquer au cas où un adaptateur 18 est intercalé entre une busette courte 19, et le tube de coulée 5, comme indiqué sur la figure 9. Cette busette 19 fait partie du tiroir 20 d'un système d'ouverture et de fermeture appelé "busette à tiroir" de l'orifice de coulée d'une poche de coulée. Dans ce cas, l'adaptateur 18 en matériau réfractaire présente à sa partie supérieure une cavité annulaire 21 qui reçoit l'extrémité de la busette 19. L'extrémité inférieure tronconique 18a de l'adaptateur 18 est emboîtée de façon étanche dans la surface intérieure 11a d'un anneau réfractaire 11.Thus the invention can also be applied to the case where an adapter 18 is interposed between a short nozzle 19, and the pouring tube 5, as indicated in FIG. 9. This nozzle 19 is part of the drawer 20 of a system of 'opening and closing called "drawer nozzle" of the orifice of a ladle. In this case, the adapter 18 made of refractory material has at its upper part an annular cavity 21 which receives the end of the nozzle 19. The frustoconical lower end 18a of the adapter 18 is nested in the interior surface 11a of a refractory ring 11.
Dans cette réalisation, l'anneau réfractaire 11 joue le même rôle vis-à-vis de l'adaptateur 13 que vis-àvis de la busette de coulée 3 dans le cas des réalisations précédentes.In this embodiment, the refractory ring 11 plays the same role with respect to the adapter 13 as with respect to the pouring nozzle 3 in the case of the preceding embodiments.
Cet adaptateur 18 est nécessaire dans tous les cas où la busette de coulée est trop courte. Cet adaptateur 18 joue parfois également le rôle de boîte pour collecter les gaz destinés à être insufflés dans l'acier liquide.This adapter 18 is necessary in all cases where the pouring nozzle is too short. This adapter 18 sometimes also acts as a box for collecting the gases intended to be blown into the liquid steel.
De plus, la forme et le mode de fixation de l'anneau réfractaire supérieur peuvent être modifiés pour s'adapter à toutes les formes possibles de busettes, pourvu que la surface intérieure de l'anneau soit en contact direct avec la surface extérieure de la busette.In addition, the shape and method of attachment of the upper refractory ring can be modified to suit all possible shapes of nozzles, provided that the inner surface of the ring is in direct contact with the outer surface of the nozzle.
De même, la forme et le mode de fixation de l'anne inférieur 16 peuvent être modifiés, pourvu que le métal liquide contenu dans le répartiteur de coulée n'entre pas en contact direct avec la paroi isolante 7 et avec la tôle extérieure 6.Likewise, the shape and the method of fixing the lower year 16 can be modified, provided that the liquid metal contained in the tundish does not come into direct contact with the insulating wall 7 and with the external sheet 6.
Pour des facilités de montage et pour éviter que l'anneau inférieur ne se détériore lors du transport, on peut l'incorporer dans la tôle 6. L'acier en fusion venant au contact de la tôle 6 fait fondre cette dernière sur toute la profondeur d'immersion dans le bain d'acier. De ce fait, il est avantageux d'incorporer cet anneau suffisamment haut dans la tôle extérieure 6 pour que la partie inférieure de cette tôle non fondue puisse maintenir l'anneau en place. Bien entendu, le tube de coulée conforme à l'invention peut être utilisé pour d'autres récipients métallurgiques que les poches de coulée et les répartiteurs de coulée. D'autre part, il est avantageux que la tôle extérieurFor ease of assembly and to prevent the lower ring from deteriorating during transport, it can be incorporated into the sheet 6. The molten steel coming from in contact with the sheet 6 melts the latter over the entire immersion depth in the steel bath. Therefore, it is advantageous to incorporate this ring high enough in the outer sheet 6 so that the lower part of this non-molten sheet can hold the ring in place. Of course, the pouring tube according to the invention can be used for other metallurgical vessels than the ladles and the tundish. On the other hand, it is advantageous that the outer sheet
6 du tube de coulée 5 comporte un bourrelet annulaire 22 en saillie vers l'extérieur (voir figure 2) définissant un espace annulaire vide 23 entre la tôle et la paroi intérieure 7 thermiquement isolante. Ce bourrelet 22 sert à maintenir au moyen d'un support 24 le tube 5 en appui contre la surface extérieure de la busette 3.6 of the pouring tube 5 comprises an annular bead 22 projecting outwards (see FIG. 2) defining an empty annular space 23 between the sheet and the thermally insulating inner wall 7. This bead 22 serves to hold, by means of a support 24, the tube 5 in abutment against the external surface of the nozzle 3.
Dans la réalisation représentée sur la figure 2, l'espace annulaire vide 23 communique avec une tubulure ho rizontale 25 raccordée à une source de gaz non oxydant ou inerte tel que de l'argon. Ce bourrelet 22. est ménagé de préférence en regard de la zone non frittable 16b adjacente à l'annea 8 de la paroi 7, qui reste poreuse. Ainsi, le gaz introduit dans l'espace annulaire 19 diffuse au travers de la paroi 7, d'une façon régulière, tout autour de cette dernière et pénètre l'intérieur du tube 7, en apportant au métal liquide une protection complémentaire contre l'oxydation.In the embodiment shown in FIG. 2, the empty annular space 23 communicates with a horizontal tube 25 connected to a source of non-oxidizing or inert gas such as argon. This bead 22. is preferably arranged opposite the non-sinterable zone 16b adjacent to the annea 8 of the wall 7, which remains porous. Thus, the gas introduced into the annular space 19 diffuses through the wall 7, in a regular manner, all around the latter and penetrates the interior of the tube 7, providing the liquid metal with additional protection against the oxidation.
Dans la réalisation de la figure 10, la tôle extérieure 6 comporte à sa partie supérieure un second bourrelet annulaire, constitué par un enroulement 26 du bord de la tôle vers l'intérieur. Cet enroulement 26 prend appui sur l'extrémit adjacente de la paroi isolante 7. Cet enroulement 26 définit un conduit annulaire communiquant avec une tubulure d'admission 28 de gaz inerte tel que de l'argon. L'enroulement 26 présente une série d'ouvertures 27 dirigées radialement vers l'axe du tube 5.In the embodiment of FIG. 10, the external sheet 6 has at its upper part a second annular bead, constituted by a winding 26 from the edge of the sheet towards the inside. This winding 26 is supported on the adjacent end of the insulating wall 7. This winding 26 defines an annular duct communicating with an intake manifold 28 of inert gas such as argon. Winding 26 presents a series of openings 27 directed radially towards the axis of the tube 5.
L'avantage de cette disposition est le suivant : étant donné que l'anneau 8 est en matériau réfractaire dur, ce matériau est susceptible de s'écailler lors qu'il est mis trop brutalement en contact avec le matériau réfractaire et dur de même nature que la busette 3 ou le prolongateur 19. Les écailles ainsi formées peuvent engendrer des entrées d'air à l'intérieur du tube de coulée 5, par aspiration (effet Venturi). L'enroulement 26 muni d'ouvertures 27 permet de réaliser des jets d'argon ou autre gaz inerte tout autour de la busette 3, en évitant ainsi toute pénétration d'air à l'intérieur du tube 5. The advantage of this arrangement is as follows: since the ring 8 is made of hard refractory material, this material is liable to flake when it is brought too suddenly into contact with the refractory and hard material of the same kind as the nozzle 3 or the extension 19. The scales thus formed can generate air inlets inside the pouring tube 5, by suction (Venturi effect). The winding 26 provided with openings 27 makes it possible to produce jets of argon or other inert gas all around the nozzle 3, thus avoiding any penetration of air inside the tube 5.

Claims

REVENDICATIONS
1. Tube de coulée (5) thermiquement isolant des- tiné à être placé entre l'orifice de coulée d'un premier récipient métallurgique (1) et un second récipient métallurgique (4), l'une des extrémités (5a) du tube de coulée étant destinée à être engagée de façon amovible et sensiblement étanche sur la busette de coulée (3) ou sur un adaptateur (18) prolongeant la busette (19) du premier récipient (1), ce tube de coulée étant en un matériau constitué par des particules inorganiques éventuellement additionnées de fibres, enrobées dans un liant, ces particules inorganiques étant frittables sous l'effet de la chaleur du métal liquide passant dans ce tube, caractérisé en ce que l'extrémité (5a) du tube destinée à être engagée sur la busette de coulée (3) comporte un anneau (8, 9, 11, 12 13, 14) en matériau réfractaire, la surface interne de cet anneau étant destinée, à. venir en contact direct avec la busette de coulée (3) ou avec l'adaptateur (18) prolongeant la busette (19).1. Thermally insulating pouring tube (5) intended to be placed between the pouring orifice of a first metallurgical container (1) and a second metallurgical container (4), one of the ends (5a) of the tube being intended to be removably and substantially sealed on the pouring nozzle (3) or on an adapter (18) extending the nozzle (19) of the first container (1), this pouring tube being made of a material by inorganic particles possibly added with fibers, coated in a binder, these inorganic particles being sinterable under the effect of the heat of the liquid metal passing through this tube, characterized in that the end (5a) of the tube intended to be engaged on the pouring nozzle (3) comprises a ring (8, 9, 11, 12 13, 14) made of refractory material, the internal surface of this ring being intended to. come into direct contact with the casting nozzle (3) or with the adapter (18) extending the nozzle (19).
2. Tube de coulée conforme à la revendication 1, caractérisé en ce que la hauteur de l'anneau (8, 9, 11,2. pouring tube according to claim 1, characterized in that the height of the ring (8, 9, 11,
12, 13, 14) en matière réfractaire est au moins égale à la distance suivant laquelle ladite extrémité (5a) du tube (5) est destinée à être engagée sur ladite busette de coulée.12, 13, 14) in refractory material is at least equal to the distance over which said end (5a) of the tube (5) is intended to be engaged on said pouring nozzle.
3. Tube de coulée- conforme à l'une quelconque des revendications 1 ou 2, le tube étant réalisé par moulage, caractérisé en ce que l'anneau (8, 9, 11, 12, 13, 14) en matériau réfractaire est fixé au matériau de la paroi (7) du tube (5), lors du moulage de cette dernière.3. pouring tube - according to any one of claims 1 or 2, the tube being produced by molding, characterized in that the ring (8, 9, 11, 12, 13, 14) of refractory material is fixed to the material of the wall (7) of the tube (5), during the molding of the latter.
4. Tube de coulée conforme à l'une quelconque des revendications 1 à 3, caractérisé en ce que l'épaisseur de la paroi de l'anneau réfractaire (8, 9, 11) est sensiblement égale à l'épaisseur de la paroi (7), les surfaces intérieure et extérieure de l'anneau étant situées sensiblement dans le prolongement des surfaces intérieure et extérieure de la paroi (7) du tube.4. pouring tube according to any one of claims 1 to 3, characterized in that the thickness of the wall of the refractory ring (8, 9, 11) is substantially equal to the thickness of the wall ( 7), the inner and outer surfaces of the ring being located substantially in the extension of the inner and outer surfaces of the wall (7) of the tube.
5. Tube de coulée conforme à la revendication 4, caractérisé en ce que la surface de contact entre l'anneau réfractaire (9) et la paroi (7) du tube comportent au moins un décrochement annulaire (10).5. pouring tube according to claim 4, characterized in that the contact surface between the refractory ring (9) and the wall (7) of the tube comprise at least one annular recess (10).
6. Tube de coulée conforme à l'une quelconque des revendications 1 à 3, caractérisé en ce que l'épaisseur de l'anneau réfractaire (11) est inférieure à celle de la paroi (7) du tube, la surface intérieure (11a) de cet anneau étant disposée sensiblement dans le prolongement de la surface intérieure (7a) du tube.6. pouring tube according to any one of claims 1 to 3, characterized in that the thickness of the refractory ring (11) is less than that of the wall (7) of the tube, the inner surface (11a ) of this ring being disposed substantially in the extension of the inner surface (7a) of the tube.
7. Tube de coulée conforme à l'une quelconque des revendications 1 à 3, caractérisé en ce que le diamètre intérieur de l'anneau réfractaire (12, 13) est inférieur au diamètre intérieur du tube.7. pouring tube according to any one of claims 1 to 3, characterized in that the internal diameter of the refractory ring (12, 13) is less than the internal diameter of the tube.
8. Tube de coulée conforme à la revendication 7, caractérisé en ce que la surface extérieure (12a) de l'anneau (12) est disposée dans le prolongement de la surface intérieure (7a) du tube.8. pouring tube according to claim 7, characterized in that the outer surface (12a) of the ring (12) is arranged in the extension of the inner surface (7a) of the tube.
9. Tube de coulée conforme à la revendication 7, caractérisé en ce que le diamètre extérieur de l'anneau réfractaire (13) est supérieur au diamètre intérieur du tube et en ce que cet anneau est en partie encastré dans un épaulement annulaire (13a) ménagé dans la paroi (7) du tube.9. pouring tube according to claim 7, characterized in that the outside diameter of the refractory ring (13) is greater than the inside diameter of the tube and in that this ring is partly embedded in an annular shoulder (13a) formed in the wall (7) of the tube.
10. Tube de coulée conforme à l'une quelconque des revendications 1 à 9, caractérisé en ce que l'anneau réfractaire (14) présente à la partie supérieure de sa surface intérieure un élargissement annulaire (14a) destiné à recevoir l'extrémité libre de la busette de coulée (3).10. pouring tube according to any one of claims 1 to 9, characterized in that the refractory ring (14) has at the upper part of its inner surface an annular widening (14a) intended to receive the free end of the pouring nozzle (3).
111. Tube de coulée conforme à l'une quelconque des revendications 1 à 10, l'extrémité de ce tube opposée à la busette (3) du premier récipient (1) étant destinée à plonger dans le métal liquide (17) qui est coulé dans le second récipient (4), caractérisé en ce que ladite extrémité du tube comporte également un anneau réfractaire (16).111. Pouring tube conforming to any one of claims 1 to 10, the end of this tube opposite the nozzle (3) of the first container (1) being intended to immerse in the liquid metal (17) which is poured into the second container (4), characterized in that that said end of the tube also includes a refractory ring (16).
12. Tube de coulée conforme à la revendication 11, caractérisé en ce que la hauteur de l'anneau (16) est au moins égale à la profondeur d'immersion du tube (5) dans le métal liquide (17) contenu dans le second récipient de coulée (4).12. pouring tube according to claim 11, characterized in that the height of the ring (16) is at least equal to the depth of immersion of the tube (5) in the liquid metal (17) contained in the second pouring container (4).
13. Tube de coulée conforme à l'une quelconque des revendications 11 ou 12, caractérisé en ce que l'épaisseur de l'anneau (16) est égale sensiblement à l'épaisseur de la paroi (7) du tube (5).13. pouring tube according to any one of claims 11 or 12, characterized in that the thickness of the ring (16) is substantially equal to the thickness of the wall (7) of the tube (5).
14. Tube de coulée conforme à l'une quelconque des revendications 1 à 13, et comportant une tôle extérieure de protection en métal, caractérisé en ce que cette tôle comporte un bourrelet annulaire (18) en saillie vers l'extéri et définissant un espace annulaire vide (19) entre cette tôle et la paroi intérieure (7) du tube, cet espace communiquant avec une tubulure (21) raccordée à une source de gaz non oxydant ou inerte.14. pouring tube according to any one of claims 1 to 13, and comprising an outer metal protective sheet, characterized in that this sheet has an annular bead (18) projecting outward and defining a space empty annular (19) between this sheet and the inner wall (7) of the tube, this space communicating with a tube (21) connected to a source of non-oxidizing or inert gas.
15. Tube de coulée conforme à la revendication 14, caractérisé en ce que ledit bourrelet annulaire (18) est adjacent à l'anneau réfractaire (8).15. pouring tube according to claim 14, characterized in that said annular bead (18) is adjacent to the refractory ring (8).
16. Tube de coulée conforme à l'une quelconque de revendications 14 ou 1 5 , caractérisé en ce que la tôle ext rieure (6) comporte à sa partie supérieure un bourrelet an laire constitué par un enroulement (26) du bord de la tôle cet enroulement étant en appui sur l'extrémité adjacente de la paroi (7) du tube et définissant en son intérieur un co duit annulaire communiquant avec une tubulure d'admission de gaz inerte, cet enroulement (26) présentant une série d'ouvertures (27) dirigées radialement vers l'axe, du tube. 16. pouring tube according to any one of claims 14 or 1 5, characterized in that the outer sheet (6) has at its upper part a bead ring formed by a winding (26) of the edge of the sheet this winding being in abutment on the adjacent end of the wall (7) of the tube and defining in its interior an annular joint communicating with an inert gas intake manifold, this winding (26) having a series of openings ( 27) directed radially towards the axis of the tube.
EP80902236A 1980-11-26 1980-11-26 Thermally insulating casting tube for metallurgic container Expired EP0065514B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80902236T ATE13829T1 (en) 1980-11-26 1980-11-26 THERMAL INSULATION TUBE FOR METALLURGICAL VESSEL.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR1980/000169 WO1982001836A1 (en) 1980-11-26 1980-11-26 Thermally insulating casting tube for metallurgic container

Publications (2)

Publication Number Publication Date
EP0065514A1 true EP0065514A1 (en) 1982-12-01
EP0065514B1 EP0065514B1 (en) 1985-06-19

Family

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Application Number Title Priority Date Filing Date
EP80902236A Expired EP0065514B1 (en) 1980-11-26 1980-11-26 Thermally insulating casting tube for metallurgic container

Country Status (10)

Country Link
US (1) US4660808A (en)
EP (1) EP0065514B1 (en)
AT (1) ATE13829T1 (en)
AU (1) AU544222B2 (en)
CA (1) CA1183325A (en)
DE (2) DE65514T1 (en)
ES (1) ES8301131A1 (en)
MX (1) MX157119A (en)
WO (1) WO1982001836A1 (en)
ZA (1) ZA817593B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516415A1 (en) * 1981-11-13 1983-05-20 Daussan & Co DEVICE FOR REMOVING THE INCLUSIONS CONTAINED IN LIQUID METALS
DE3226047C2 (en) * 1982-07-12 1985-11-28 Didier-Werke Ag, 6200 Wiesbaden Connection between the outlet cone of the closure of a casting vessel for molten metal and the protective tube connected to it
GB8422486D0 (en) * 1984-09-06 1984-10-10 Foseco Trading Ag Pouring tubes
US4756452A (en) * 1986-11-13 1988-07-12 Shinagawa Refractories Co., Ltd. Molten metal pouring nozzle
US4951929A (en) * 1989-04-06 1990-08-28 Didier-Taylor Refractories Corporation Refractory assembly including inner and outer refractory members with interference shrink fit therebetween and method of formation thereof
US5118016A (en) * 1990-09-27 1992-06-02 Martin & Pagenstecher, Inc. Bottom pour tiles with self sealing joint for pouring liquid steel
FR2757431B1 (en) * 1996-12-20 1999-02-12 Vesuvius France Sa LIQUID METAL TRANSFER INSTALLATION, METHOD OF IMPLEMENTATION, AND REFRACTORIES
DK0932463T3 (en) * 1996-10-17 2001-10-01 Vesuvius Crucible Co Refractory aggregates
WO2005046457A2 (en) * 2003-11-05 2005-05-26 Texas Scottish Rite Hospital For Children A biomimetic biosynthetic nerve implant
DE102009052279A1 (en) * 2009-11-09 2011-06-01 Lwb Refractories Gmbh Carbon-containing refractory material for use in the casting of steel in the sub-casting process and moldings produced therefrom
DE102017109448A1 (en) * 2017-05-03 2018-11-08 EKW Gesellschaft mit beschränkter Haftung Casting nozzle with exchangeable crown

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH387883A (en) * 1959-10-13 1965-02-15 Beteiligungs & Patentverw Gmbh Pouring device
FR1493389A (en) * 1966-09-22 1967-08-25 United States Steel Corp Device for continuous metal casting
GB1215330A (en) * 1967-01-20 1970-12-09 Stoecker & Kunz Gmbh Improvements relating to casting ladles provided with teeming nozzles
DE1958192U (en) * 1967-01-20 1967-04-06 Stoecker & Kunz G M B H CASTING PAN SUSPENSION, IN PARTICULAR FOR CONTINUOUS CASTING.
FR2333599A1 (en) * 1975-12-02 1977-07-01 Daussan Henri Casting pipe used between tundish and mould - where pipe has refractory lining which glazes when heated
FR2433995A1 (en) * 1978-08-24 1980-03-21 Daussan & Co METHOD AND DEVICE FOR CLOSING THE CASTING ORIFICE OF A METALLURGICAL CONTAINER
DE2919880C2 (en) * 1979-05-17 1983-10-13 Didier-Werke Ag, 6200 Wiesbaden Refractory pouring pipe between pouring ladle and intermediate containers of continuous casting plants

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8201836A1 *

Also Published As

Publication number Publication date
ATE13829T1 (en) 1985-07-15
AU544222B2 (en) 1985-05-23
EP0065514B1 (en) 1985-06-19
DE65514T1 (en) 1983-04-28
CA1183325A (en) 1985-03-05
ZA817593B (en) 1982-12-29
AU7717281A (en) 1982-06-03
WO1982001836A1 (en) 1982-06-10
US4660808A (en) 1987-04-28
ES507420A0 (en) 1982-11-16
ES8301131A1 (en) 1982-11-16
DE3070789D1 (en) 1985-08-01
MX157119A (en) 1988-10-28

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