EP0901851A1 - Side wall for confining the casting space in a continuous roll caster installation for the production of metallic strips and casting installation equipped therewith - Google Patents

Side wall for confining the casting space in a continuous roll caster installation for the production of metallic strips and casting installation equipped therewith Download PDF

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Publication number
EP0901851A1
EP0901851A1 EP98402164A EP98402164A EP0901851A1 EP 0901851 A1 EP0901851 A1 EP 0901851A1 EP 98402164 A EP98402164 A EP 98402164A EP 98402164 A EP98402164 A EP 98402164A EP 0901851 A1 EP0901851 A1 EP 0901851A1
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EP
European Patent Office
Prior art keywords
casting
space
cylinders
installation
neck
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
EP98402164A
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German (de)
French (fr)
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EP0901851B1 (en
Inventor
Wilhelm Schmitz
Dieter Senk
Guido Stebner
Rolf Simon
Christophe Ganser
Jean-Michel Damasse
Patrice Vicente
Dominique Themines
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Thyssen Stahl AG
USINOR SA
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Thyssen Stahl AG
USINOR SA
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Publication of EP0901851A1 publication Critical patent/EP0901851A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
    • B22D11/0682—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting

Definitions

  • the invention relates to the continuous casting of thin metal strips, made directly from liquid metal. More specifically, it concerns the obturation lateral of the casting space of the so-called “casting between cylinders" installations, applied in particular with the casting of strips of steel or ferrous alloys.
  • the casting space is delimited on the one hand by the internally cooled cylindrical side surfaces of two cylinders close horizontal rotated in opposite directions around their axes, against which the liquid metal initiates its solidification, and on the other hand by plates of material refractory applied by elastic means against the flat ends of the cylinders (called “songs"). These plates close off the pouring space laterally, so that prevent liquid metal from leaking out of the installation.
  • Their lower edge is located in below the "neck”, ie the area where the surfaces of the cylinders are closest to one on the other, and whose width corresponds substantially to the desired thickness for the strip.
  • the side cover plates must be strongly preheated before casting, so that the liquid metal does not solidify against them during the filling of the mold (whose bottom, during the filling operation, is closed by a part called "mannequin", which is extracted from the casting space when begins the rotation of the cylinders and brings with it the beginning of the strip) and in the first moments of casting.
  • the faces side constitute a thermally delicate point of the machine, in that they create inevitably in their vicinity an area where the extraction of heat from the metal liquid is abnormally high. This is, in particular, the case near the cylinders which, as they are internally cooled by circulation of water, they tend to cool lateral faces in the vicinity of the areas where their contact takes place.
  • the thickness of the strip solidified at neck level is greater than the nominal width of the neck. It is then necessary to remove the cylinders from each other to prevent them from providing a rolling force on the strip then that they were not designed for that.
  • This spacing of the cylinders is a source of faults on the tape, which are related to the changes it causes on the thickness and the mode of solidification of the product.
  • Another consequence of the abnormal conditions of the solidification of the strip near the lateral faces is the strong pressure exerted by the metal being solidified on the lower part of the side faces. He is coming frequently that this pressure is sufficient to move the side face back on at at least part of its height, which can locally destroy the tightness of the contact side cylinders. Liquid metal can then escape from the pouring space.
  • the object of the invention is to propose a configuration of the casting installation making it possible to create conditions for solidifying the strip in the vicinity of the faces which are not likely to disturb the regularity of the casting process. It should also limit the phenomenon of receding side faces.
  • the subject of the invention is a lateral face for closing off the pouring space.
  • a continuous casting installation of metal strips of the type comprising two internally cooled counter-rotating cylinders with horizontal axes, the surfaces of which cylindrical sides define a casting space whose width at the neck determines the thickness of the strip, said lateral face having an active part intended to rub against the edges of the cylinders during casting and facing said casting space, characterized in that the dimensions of said active part are such that its edge lower is intended to be located at a distance equal to at least 1 mm above the neck when the side face is mounted on the casting installation.
  • the subject of the invention is also an installation for continuously casting strips of the type comprising two internally cooled counter-rotating cylinders, with axes horizontal, whose cylindrical side surfaces define a pouring space whose width at the neck determines the thickness of the strip, and two lateral sides for sealing its pouring space, characterized in that said lateral faces are of the type previously described.
  • the active part of the lateral face is to say its part which is in contact with either the edges of the cylinders or the liquid metal enclosed by the casting space, is interrupted not below the neck as it is usual, but on top of it.
  • the metal present in front of this free space cannot cause of the side faces, even if its solidified fraction is abnormally high. Else apart, this free space gives the possibility for the solidified metal or in the process of solidification to extend towards the outside of the casting space, which limits the forces that must bear the edges of the cylinders.
  • the inventors have realized that the cooling conditions of the steel at the inside of the mold, with the usual casting parameters, was such that from a level which can be a few cm above the neck, the solidification of the metal on the edges of the casting space, although not yet complete, is already sufficiently advanced so that there is no significant leakage of liquid metal to the outside of the machine, even if the metal is no longer retained by the side faces. They deduced that the removal of the lower part of the lateral faces of the prior art was possible. This suppression makes the casting machine more tolerant of slight deviations in the process of solidification of the strip.
  • a thickness of the skins solidified on the edges of the cylinders slightly larger than expected in the last mm or cm preceding the collar no longer causes the side faces to recede and the risk of loss sealing in the upper levels of the casting space associated with them. Else apart, the excessively solidified parts of the strip can extend laterally if the cylinders exert on them a compressive force, which makes significantly less likely the need to spread the cylinders to minimize the stresses they undergo.
  • the invention thus provides greater stability of the casting conditions, which will in the sense of better overall tape quality and higher reliability of the casting installation.
  • the side face 1 according to the prior art shown schematically in Figure 1 includes a support plate 2, in which the active part 3 of the face is embedded lateral 1, ie its portion intended, during casting, to come into contact with the edges 4 cylinders 5, 5 ′ (of which only the contours have been shown in dotted lines in FIG. la), of liquid steel which will contain the casting space 6 of the machine and, below the level from the neck 7 where the cylinders 4, 4 'are at most close to each other, from the solidified strip.
  • a support plate 2 in which the active part 3 of the face is embedded lateral 1, ie its portion intended, during casting, to come into contact with the edges 4 cylinders 5, 5 ′ (of which only the contours have been shown in dotted lines in FIG. la), of liquid steel which will contain the casting space 6 of the machine and, below the level from the neck 7 where the cylinders 4, 4 'are at most close to each other, from the solidified strip.
  • the edges 4 cylinders 5, 5 ′ of liquid steel which will contain the casting
  • the part active 3 is, in the example shown, divided into two portions.
  • Portion 8 in double arc of circle which, when the side face 1 is mounted on the machine, constitutes the area of contact with the edges 4 of the cylinders 5, 5 ', the immediate vicinity of this contact zone and the area surrounding the neck 7, is constructed of a first refractory material.
  • Its quality essential is a high hardness so that it resists friction as well as possible edges 4 of the cylinders 5, 5 'and (around the neck 7) of the strip being solidified or already solidified. It is, for example, made of SiAlON® or boron nitride. She may be consisting of a single piece or of several joined and integral parts of each other Its lower edge 9 is located below the level of the neck 7, so as to produce a total lateral closure of the casting space 6.
  • the remaining portion 10 of the active part 3 is made of a refractory material having a high insulating power, such as silica or alumina.
  • the active part 3 of the side face 1 is projecting relative to the support plate 2 of a thickness equal to at least its maximum tolerable wear during casting, by example 10 mm.
  • the whole active part 3 of the side face 1 can be constituted by a single part.
  • FIG. 2 which represents a lateral face 11 according to the invention mounted on the casting installation
  • the elements common with those of FIG. 1 are designated by the same references.
  • the lower edge 12 of the active part 3 of the lateral face 11 which ensures contact with the cylinders 5, 5 'and closes the lower part of the casting space 6 is no longer located under the neck 7, but at a distance "d" above it.
  • This distance "d" can be very small, up to 1 mm, if we usually manage to regulate skin growth with great precision solidified on the edges of the cylinders 5, 5 ', and if the proportion of solid matter present in the metal not yet fully solidified in this region of the casting space 6 is likely to go very quickly from 0 to 100%.
  • a distance "d” of between 10 and 40 mm is suitable for the most common grades of stainless steel, cast in the form of strips 3 mm thick with 1500 mm diameter cylinders and casting speeds of around 1 m / min.
  • the optimal choice of distance “d” also depends on the pressure ferrostatic reigning in the lower part of the casting space, therefore of the geometry of the casting installation and the nominal level of the surface of the liquid steel present in casting space. Good results have been obtained with a distance "d” of 1 to 7 mm on a machine fitted with 600 mm diameter cylinders, when casting steels low-alloy carbon and iron-silicon alloys.
  • the lower edge 12 of the part active 3 of the side face 11 which faces the casting space 6 does not have a sharp angle, but a rounded 13 whose radius of curvature can, for example, be of the order of 10 to 20 mm.
  • the same function can be ensured by bevelling the lower edge 12, according to a inclined plane, for example, at 45 °.
  • An indicator of the effectiveness of the invention is the number of setbacks from the lateral face that we observe during casting. It was thus found that this number could be divided by three on the whole of a casting, compared to the use of descending side faces down to the neck. The improvement is even more noticeable when we consider the first minutes of casting, during which the operation of the casting machine is not always perfectly stabilized.
  • the invention is applicable not only to casting between cylinders of strips of steel and other ferrous alloys, but of any other metal liable to be cast by this method.

Abstract

A lateral face (11) is claimed for closing the casting space (6) of an installation for the continuous casting of metal strip. It has two internally cooled contra-rotating rolls (5, 5'), with horizontal axes, and the cylindrical lateral faces define a casting space (6). The width of the neck (7) determines the thickness of the strip. The lateral face (11) presents an active part (3) to rub against the sides (4) of the rolls (5, 5') during casting and faces the casting space (6). The dimensions of this active part (3) are such that its lower edge (12) is designed to be situated at a distance (d) equal to at least 1 mm above the neck (7) whilst the lateral face (7) is mounted on the casting installation. The continuous casting installation incorporating this lateral face is also claimed.

Description

L'invention concerne la coulée continue de bandes métalliques de faible épaisseur, effectuée directement à partir de métal liquide. Plus précisément, elle concerne l'obturation latérale de l'espace de coulée des installations dites de "coulée entre cylindres", appliquées notamment à la coulée de bandes d'acier ou d'alliages ferreux.The invention relates to the continuous casting of thin metal strips, made directly from liquid metal. More specifically, it concerns the obturation lateral of the casting space of the so-called "casting between cylinders" installations, applied in particular with the casting of strips of steel or ferrous alloys.

Dans ce type d'installations, dont l'application à la coulée de bandes d'acier de quelques mm d'épaisseur est en cours d'industrialisation, l'espace de coulée est délimité d'une part par les surfaces latérales cylindriques refroidies intérieurement de deux cylindres horizontaux rapprochés mis en rotation en sens contraires autour de leurs axes, contre lesquelles le métal liquide initie sa solidification, et d'autre part par des plaques en matériau réfractaire appliquées par des moyens élastiques contre les extrémités planes des cylindres (appelées "chants"). Ces plaques obturent latéralement l'espace de coulée, de manière à empêcher les fuites de métal liquide hors de l'installation. Leur bord inférieur est situé en dessous du "col", c'est à dire de la zone où les surfaces des cylindres sont au plus près l'une de l'autre, et dont la largeur correspond sensiblement à l'épaisseur désirée pour la bande.In this type of installation, the application of which to the casting of steel strips of a few mm thick is being industrialized, the casting space is delimited on the one hand by the internally cooled cylindrical side surfaces of two cylinders close horizontal rotated in opposite directions around their axes, against which the liquid metal initiates its solidification, and on the other hand by plates of material refractory applied by elastic means against the flat ends of the cylinders (called "songs"). These plates close off the pouring space laterally, so that prevent liquid metal from leaking out of the installation. Their lower edge is located in below the "neck", ie the area where the surfaces of the cylinders are closest to one on the other, and whose width corresponds substantially to the desired thickness for the strip.

Les plaques d'obturation latérale doivent impérativement être fortement préchauffées avant la coulée, de manière à éviter que le métal liquide ne se solidifie contre elles lors du remplissage de la lingotière (dont le fond, pendant l'opération de remplissage, est obturé par une pièce appelée "mannequin", qui est extraite de l'espace de coulée lorsque débute la rotation des cylindres et entraíne avec elle le début de la bande) et dans les premiers moments de la coulée. Mais même si une telle précaution est prise, les faces latérales constituent un point thermiquement délicat de la machine, en ce qu'elles créent inévitablement dans leur voisinage une zone où l'extraction de chaleur à partir du métal liquide est anormalement élevée. C'est, en particulier, le cas à proximité des cylindres qui, comme ils sont refroidis intérieurement par circulation d'eau, ont tendance à refroidir les faces latérales au voisinage des zones où à lieu leur contact. Il peut en résulter que la solidification de l'acier sur les rives des cylindres s'effectue significativement plus rapidement que sur les portions des cylindres plus proches de leurs zones centrales, et cela peut être une source de problèmes. En effet, normalement les "peaux" de métal qui se solidifient sur chacun des cylindres, et dont l'épaisseur en un point donné croít progressivement au fur et à mesure de la rotation du cylindre, doivent, pour former la bande, se rejoindre soit exactement au niveau du col, soit très légèrement en dessous de ce niveau. Si cette jonction des peaux se produit trop sensiblement plus bas que le col, la bande risque de ne pas être assez solide en sortie des cylindres et de se fissurer. Elle risque également de présenter des porosités internes. Inversement, si la jonction des peaux s'effectue en amont du col, sous l'influence notamment de faces latérales trop froides, l'épaisseur de la bande solidifiée au niveau du col est supérieure à la largeur nominale du col. Il est alors nécessaire d'écarter les cylindres l'un de l'autre pour leur éviter de fournir un effort de laminage sur la bande alors qu'ils ne sont pas conçus pour cela. Cet écartement des cylindres est une source de défauts sur la bande, qui sont liés aux changements qu'il entraíne sur l'épaisseur et le mode de solidification du produit. Une autre conséquence des conditions anormales de la solidification de la bande à proximité des faces latérales est la forte pression exercée par le métal en cours de solidification sur la partie inférieure des faces latérales. Il arrive fréquemment que cette pression soit suffisante pour faire reculer la face latérale sur au moins une partie de sa hauteur, ce qui peut détruire localement l'étanchéité du contact cylindres-faces latérales. Du métal liquide peut alors s'échapper hors de l'espace de coulée.The side cover plates must be strongly preheated before casting, so that the liquid metal does not solidify against them during the filling of the mold (whose bottom, during the filling operation, is closed by a part called "mannequin", which is extracted from the casting space when begins the rotation of the cylinders and brings with it the beginning of the strip) and in the first moments of casting. But even if such a precaution is taken, the faces side constitute a thermally delicate point of the machine, in that they create inevitably in their vicinity an area where the extraction of heat from the metal liquid is abnormally high. This is, in particular, the case near the cylinders which, as they are internally cooled by circulation of water, they tend to cool lateral faces in the vicinity of the areas where their contact takes place. It may result that the solidification of the steel on the edges of the cylinders takes place significantly faster than on the portions of the cylinders closer to their central areas, and this can be a source of problems. Indeed, normally the metal "skins" which solidify on each of the cylinders, and whose thickness at a given point gradually increases as measure of the rotation of the cylinder, must, to form the band, join either exactly at the level of the neck, or very slightly below this level. If this junction skin occurs too noticeably lower than the neck, the band may not be strong enough at the outlet of the cylinders and to crack. It may also present internal porosities. Conversely, if the skins are joined upstream of the cervix, under the influence of particularly cold side faces, the thickness of the strip solidified at neck level is greater than the nominal width of the neck. It is then necessary to remove the cylinders from each other to prevent them from providing a rolling force on the strip then that they were not designed for that. This spacing of the cylinders is a source of faults on the tape, which are related to the changes it causes on the thickness and the mode of solidification of the product. Another consequence of the abnormal conditions of the solidification of the strip near the lateral faces is the strong pressure exerted by the metal being solidified on the lower part of the side faces. He is coming frequently that this pressure is sufficient to move the side face back on at at least part of its height, which can locally destroy the tightness of the contact side cylinders. Liquid metal can then escape from the pouring space.

Le but de l'invention est de proposer une configuration de l'installation de coulée permettant de créer des conditions de solidification de la bande au voisinage des faces latérales qui ne soient pas susceptibles de perturber la régularité du processus de coulée. Elle devrait également limiter le phénomène de recul des faces latérales.The object of the invention is to propose a configuration of the casting installation making it possible to create conditions for solidifying the strip in the vicinity of the faces which are not likely to disturb the regularity of the casting process. It should also limit the phenomenon of receding side faces.

L'invention a pour objet une face latérale pour l'obturation de l'espace de coulée d'une installation de coulée continue de bandes métalliques du type comportant deux cylindres contrarotatifs refroidis intérieurement, à axes horizontaux, dont les surfaces latérales cylindriques définissent un espace de coulée dont la largeur au col détermine l'épaisseur de la bande, ladite face latérale présentant une partie active destinée à frotter contre les chants des cylindres en cours de coulée et à faire face audit espace de coulée, caractérisée en ce que les dimensions de ladite partie active sont telles que son bord inférieur est destiné à être situé à une distance égale à au moins 1 mm au-dessus du col lorsque la face latérale est montée sur l'installation de coulée.The subject of the invention is a lateral face for closing off the pouring space. of a continuous casting installation of metal strips of the type comprising two internally cooled counter-rotating cylinders with horizontal axes, the surfaces of which cylindrical sides define a casting space whose width at the neck determines the thickness of the strip, said lateral face having an active part intended to rub against the edges of the cylinders during casting and facing said casting space, characterized in that the dimensions of said active part are such that its edge lower is intended to be located at a distance equal to at least 1 mm above the neck when the side face is mounted on the casting installation.

L'invention a également pour objet une installation de coulée continue de bandes métalliques du type comportant deux cylindres contrarotatifs refroidis intérieurement, à axes horizontaux, dont les surfaces latérales cylindriques définissent un espace de coulée dont la largeur au col détermine l'épaisseur de la bande, et deux faces latérales d'obturation de son espace de coulée, caractérisée en ce que lesdites faces latérales sont du type précédemment décrit.The subject of the invention is also an installation for continuously casting strips of the type comprising two internally cooled counter-rotating cylinders, with axes horizontal, whose cylindrical side surfaces define a pouring space whose width at the neck determines the thickness of the strip, and two lateral sides for sealing its pouring space, characterized in that said lateral faces are of the type previously described.

Comme on l'aura compris, selon l'invention la partie active de la face latérale, c'est à dire sa partie qui est au contact soit des chants des cylindres, soit du métal liquide renfermé par l'espace de coulée, est interrompue non pas en dessous du col comme il est habituel, mais au-dessus de celui-ci. On laisse ainsi de part et d'autre du col un espace libre où le métal n'est au contact d'aucun matériau réfractaire et n'exerce donc aucune pression sur les faces latérales. Ainsi, le métal présent face à cet espace libre ne peut pas provoquer de recul des faces latérales, même si sa fraction solidifiée est anormalement élevée. D'autre part, cet espace libre donne la possibilité au métal solidifié ou en cours de solidification de s'étendre vers l'extérieur de l'espace de coulée, ce qui limite les efforts que doivent supporter les rives des cylindres. As will be understood, according to the invention the active part of the lateral face is to say its part which is in contact with either the edges of the cylinders or the liquid metal enclosed by the casting space, is interrupted not below the neck as it is usual, but on top of it. This leaves a free space on both sides of the pass where the metal is not in contact with any refractory material and therefore exerts no pressure on the side faces. Thus, the metal present in front of this free space cannot cause of the side faces, even if its solidified fraction is abnormally high. Else apart, this free space gives the possibility for the solidified metal or in the process of solidification to extend towards the outside of the casting space, which limits the forces that must bear the edges of the cylinders.

Les inventeurs se sont aperçu que les conditions de refroidissement de l'acier à l'intérieur de la lingotière, avec les paramètres de coulée usuels, étaient telles que dès un niveau qui peut se situer quelques cm au-dessus du col, la solidification du métal sur les bords de l'espace de coulée, quoique pas encore complète, est déjà suffisamment avancée pour qu'il ne se produise aucune fuite significative de métal liquide vers l'extérieur de la machine, même si le métal n'est plus retenu par les faces latérales. Ils en ont déduit que la suppression de la partie inférieure des faces latérales de l'art antérieur était possible. Cette suppression rend la machine de coulée plus tolérante à de légers écarts dans le processus de solidification de la bande. En effet, avec l'invention, une épaisseur des peaux solidifiées sur les rives des cylindres un peu plus importante que prévu dans les derniers mm ou cm précédant le col ne provoque plus de recul des faces latérales et les risques de perte d'étanchéité dans les niveaux supérieurs de l'espace de coulée qui leur sont associés. D'autre part, les parties de la bande solidifiées à l'excès ont la possibilité de s'étendre latéralement si les cylindres exercent sur elles un effort de compression, ce qui rend sensiblement moins probable la nécessité d'écarter les cylindres pour minimiser les contraintes qu'ils subissent.The inventors have realized that the cooling conditions of the steel at the inside of the mold, with the usual casting parameters, was such that from a level which can be a few cm above the neck, the solidification of the metal on the edges of the casting space, although not yet complete, is already sufficiently advanced so that there is no significant leakage of liquid metal to the outside of the machine, even if the metal is no longer retained by the side faces. They deduced that the removal of the lower part of the lateral faces of the prior art was possible. This suppression makes the casting machine more tolerant of slight deviations in the process of solidification of the strip. Indeed, with the invention, a thickness of the skins solidified on the edges of the cylinders slightly larger than expected in the last mm or cm preceding the collar no longer causes the side faces to recede and the risk of loss sealing in the upper levels of the casting space associated with them. Else apart, the excessively solidified parts of the strip can extend laterally if the cylinders exert on them a compressive force, which makes significantly less likely the need to spread the cylinders to minimize the stresses they undergo.

L'invention procure ainsi une plus grande stabilité des conditions de coulée, qui va dans le sens d'une meilleure qualité globale de la bande et d'une fiabilité plus élevée de l'installation de coulée.The invention thus provides greater stability of the casting conditions, which will in the sense of better overall tape quality and higher reliability of the casting installation.

L'invention sera mieux comprise à la lecture de la description qui suit, donnée en référence aux figures annexées suivantes:

  • la figure 1 qui schématise vue de face (figure 1a) et de profil (figure 1b) en coupe selon Ib-Ib une face latérale de coulée continue entre cylindres selon l'art antérieur;
  • la figure 2 qui schématise vue de face (figure 2a) et de profil (figure 2b) en coupe selon IIb-IIb une face latérale de coulée continue entre cylindres selon l'invention.
The invention will be better understood on reading the description which follows, given with reference to the following appended figures:
  • Figure 1 which shows schematically front view (Figure 1a) and profile (Figure 1b) in section along Ib-Ib a side face of continuous casting between cylinders according to the prior art;
  • Figure 2 which shows schematically front view (Figure 2a) and profile (Figure 2b) in section along IIb-IIb a side face of continuous casting between cylinders according to the invention.

La face latérale 1 selon l'art antérieur représentée schématiquement sur la figure 1 comprend une plaque support 2, dans laquelle est encastrée la partie active 3 de la face latérale 1, c'est à dire sa portion destinée, pendant la coulée, à venir au contact des chants 4 des cylindres 5, 5' (dont seuls les contours ont été représentés en pointillés sur la figure la), de l'acier liquide que renfermera l'espace de coulée 6 de la machine et, en dessous du niveau du col 7 où les cylindres 4, 4' sont au plus prés l'un de l'autre, de la bande solidifiée. Des moyens (non représentés) connus en eux-mêmes assurent l'application de la face latérale 1 contre les chants 4 des cylindres 5, 5'. Ils autorisent, grâce à des ressorts ou des vérins, des retraits temporaires de la face latérale 1 en cas d'infiltration de métal entre sa partie active 3 et le chant 4 d'un cylindre 5, 5', ou d'effort excessif exercé par la bande en cours de solidification sur sa partie inférieure. On pourra se reporter, notamment, au document EP-A-0 698 433 pour la description d'un exemple (non limitatif) de tels moyens. La partie active 3 est, dans l'exemple représenté, divisée en deux portions. La portion 8 en double arc de cercle qui, lorsque la face latérale 1 est montée sur la machine, constitue la zone de contact avec les chants 4 des cylindres 5, 5', le voisinage immédiat de cette zone de contact et la zone entourant le col 7, est construite en un premier matériau réfractaire. Sa qualité essentielle est une dureté élevée pour qu'elle résiste aussi bien que possible au frottement des chants 4 des cylindres 5, 5' et (autour du col 7) de la bande en cours de solidification ou déjà solidifiée. Elle est, par exemple, en SiAlON® ou en nitrure de bore. Elle peut être constituée d'une seule pièce ou de plusieurs pièces jointives et solidaires les unes des autres Son bord inférieur 9 est situé en dessous du niveau du col 7, de manière à réaliser une obturation latérale totale de l'espace de coulée 6. La portion 10 restante de la partie active 3 est en un matériau réfractaire présentant un pouvoir isolant élevé, tel que la silice ou l'alumine. La partie active 3 de la face latérale 1 est en saillie par rapport à la plaque support 2 d'une épaisseur égale au moins à son usure maximale tolérable au cours de la coulée, par exemple 10 mm. Au cours de la coulée, les portions de la partie active 3 qui sont au contact des chants 4 des cylindres 5, 5' s'usent essentiellement par frottement, avec pour conséquence que, peu à peu, les autres portions de la partie active 3, qui ne s'usent qu'à une vitesse plus modérée car elles ne sont au contact que de l'acier, liquide ou en cours de solidification, pénètrent légèrement à l'intérieur de l'espace de coulée 5. En variante, toute la partie active 3 de la face latérale 1 peut être constituée par une pièce unique.The side face 1 according to the prior art shown schematically in Figure 1 includes a support plate 2, in which the active part 3 of the face is embedded lateral 1, ie its portion intended, during casting, to come into contact with the edges 4 cylinders 5, 5 ′ (of which only the contours have been shown in dotted lines in FIG. la), of liquid steel which will contain the casting space 6 of the machine and, below the level from the neck 7 where the cylinders 4, 4 'are at most close to each other, from the solidified strip. Of means (not shown) known in themselves ensure the application of the side face 1 against the edges 4 of the cylinders 5, 5 '. They allow, thanks to springs or cylinders, temporary withdrawals from the side face 1 in the event of metal infiltration between its active part 3 and the edge 4 of a cylinder 5, 5 ′, or of excessive force exerted by the strip during solidification on its lower part. Reference may be made, in particular, to document EP-A-0 698,433 for the description of an example (non-limiting) of such means. The part active 3 is, in the example shown, divided into two portions. Portion 8 in double arc of circle which, when the side face 1 is mounted on the machine, constitutes the area of contact with the edges 4 of the cylinders 5, 5 ', the immediate vicinity of this contact zone and the area surrounding the neck 7, is constructed of a first refractory material. Its quality essential is a high hardness so that it resists friction as well as possible edges 4 of the cylinders 5, 5 'and (around the neck 7) of the strip being solidified or already solidified. It is, for example, made of SiAlON® or boron nitride. She may be consisting of a single piece or of several joined and integral parts of each other Its lower edge 9 is located below the level of the neck 7, so as to produce a total lateral closure of the casting space 6. The remaining portion 10 of the active part 3 is made of a refractory material having a high insulating power, such as silica or alumina. The active part 3 of the side face 1 is projecting relative to the support plate 2 of a thickness equal to at least its maximum tolerable wear during casting, by example 10 mm. During the casting, the portions of the active part 3 which are in contact edges 4 of cylinders 5, 5 'wear mainly by friction, with for consequence that, little by little, the other portions of the active part 3, which wear only at one more moderate speed because they are only in contact with steel, liquid or being solidification, penetrate slightly inside the casting space 5. As a variant, the whole active part 3 of the side face 1 can be constituted by a single part.

Sur la figure 2 qui représente une face latérale 11 selon l'invention montée sur l'installation de coulée, les éléments communs avec ceux de la figure 1 sont désignés par les mêmes références. Selon l'invention, pour les raisons qui ont été dites, le bord inférieur 12 de la partie active 3 de la face latérale 11 qui assure le contact avec les cylindres 5, 5' et obture la partie inférieure de l'espace de coulée 6 est situé non plus sous le col 7, mais à une distance "d" au-dessus de celui-ci. Cette distance "d" peut être très faible, jusqu'à 1 mm, si on parvient habituellement à réguler avec une grande précision la croissance des peaux solidifiées sur les rives des cylindres 5, 5', et si la proportion de matière solide présente dans le métal non encore intégralement solidifié dans cette région de l'espace de coulée 6 est susceptible de passer très rapidement de 0 à 100%. Ces paramètres dépendent, notamment, de la nuance coulée. Les nuances d'acier les plus chargées en carbone et en éléments d'alliage divers, telles que les aciers inoxydables, ont des intervalles de solidification (l'écart entre les températures de liquidus et de solidus) plus larges que ceux des nuances d'acier ordinaires ou des alliages fer-nickel, et cela rend plus délicate la maítrise de leurs conditions de solidification. Surtout, ce large intervalle de solidification implique que l'on commence à observer un taux important de matière solide au voisinage de la face latérale 11 à des niveaux relativement élevés de l'espace de coulée 6. Pour ces aciers à large intervalle de solidification, il faut donc prévoir une distance "d" plus importante que pour les nuances à intervalle de solidification étroit qui se solidifient rapidement une fois atteinte la température de liquidus. Dans la pratique, une distance "d" comprise entre 10 et 40 mm est convenable pour les nuances d'aciers inoxydables les plus courantes, coulées sous forme de bandes d'épaisseur 3 mm avec des cylindres de diamètre 1500 mm et des vitesses de coulée de l'ordre de 1 m/mn. Le choix optimal de la distance "d" dépend aussi de la pression ferrostatique régnant dans la partie inférieure de l'espace de coulée, donc de la géométrie de l'installation de coulée et du niveau nominal de la surface de l'acier liquide présent dans l'espace de coulée. On a ainsi obtenu de bons résultats avec une distance "d" de 1 à 7 mm sur une machine équipée de cylindres de diamètre 600 mm, lors de la coulée d'aciers au carbone peu alliés et d'alliages fer-silicium.In FIG. 2 which represents a lateral face 11 according to the invention mounted on the casting installation, the elements common with those of FIG. 1 are designated by the same references. According to the invention, for the reasons which have been said, the lower edge 12 of the active part 3 of the lateral face 11 which ensures contact with the cylinders 5, 5 'and closes the lower part of the casting space 6 is no longer located under the neck 7, but at a distance "d" above it. This distance "d" can be very small, up to 1 mm, if we usually manage to regulate skin growth with great precision solidified on the edges of the cylinders 5, 5 ', and if the proportion of solid matter present in the metal not yet fully solidified in this region of the casting space 6 is likely to go very quickly from 0 to 100%. These parameters depend, in particular, of the casting shade. The grades of steel most loaded with carbon and elements of various alloys, such as stainless steels, have solidification intervals (the gap between liquidus and solidus temperatures) wider than those of steel grades ordinary or iron-nickel alloys, and this makes it more difficult to control their conditions solidification. Above all, this wide solidification interval implies that one begins to observe a high level of solid matter in the vicinity of the lateral face 11 at relatively high levels of casting space 6. For these steels with a wide range of solidification, it is therefore necessary to provide a distance "d" greater than for the grades to narrow solidification interval which solidifies quickly when temperature is reached of liquidus. In practice, a distance "d" of between 10 and 40 mm is suitable for the most common grades of stainless steel, cast in the form of strips 3 mm thick with 1500 mm diameter cylinders and casting speeds of around 1 m / min. The optimal choice of distance "d" also depends on the pressure ferrostatic reigning in the lower part of the casting space, therefore of the geometry of the casting installation and the nominal level of the surface of the liquid steel present in casting space. Good results have been obtained with a distance "d" of 1 to 7 mm on a machine fitted with 600 mm diameter cylinders, when casting steels low-alloy carbon and iron-silicon alloys.

De préférence, afin de réduire les sollicitations mécaniques qui s'exercent sur lui et pourraient entraíner sa dégradation rapide et incontrôlée, le bord inférieur 12 de la partie active 3 de la face latérale 11 qui fait face à l'espace de coulée 6 ne présente pas d'angle vif, mais un arrondi 13 dont le rayon de courbure peut, par exemple, être de l'ordre de 10 à 20 mm. La même fonction peut être assurée par un biseautage du bord inférieur 12, selon un plan incliné, par exemple, à 45°.Preferably, in order to reduce the mechanical stresses exerted on it and could cause its rapid and uncontrolled degradation, the lower edge 12 of the part active 3 of the side face 11 which faces the casting space 6 does not have a sharp angle, but a rounded 13 whose radius of curvature can, for example, be of the order of 10 to 20 mm. The same function can be ensured by bevelling the lower edge 12, according to a inclined plane, for example, at 45 °.

On peut prévoir également la possibilité de refroidir la tranche de la bande par projection d'un fluide (eau, azote ou argon liquide...) entre le bord inférieur de la partie active 3 de la face latérale 11 et le col 7. Ce refroidissement peut être réalisé de manière permanente, afin de s'assurer que la rive de la bande est toujours suffisamment solidifiée pour éviter qu'elle ne se déchire en laissant échapper du métal liquide. Il peut aussi être réalisé seulement lorsqu'on observe l'initiation d'une telle déchirure de la rive, ou lorsque le suivi des paramètres de coulée fait suspecter des risques d'apparition d'une telle déchirure. Comme moyens d'amenée de fluide de refroidissement sur la tranche de la bande, on peut utiliser, par exemple, un ou plusieurs conduits 14 traversant la plaque support 2 et débouchant dans l'espace 15 compris entre la plaque support 2, les chants 4 des cylindres 5, 5' et le col 7. Mais on peut imaginer d'autres moyens d'amenée de fluide, qui seraient éventuellement indépendants de la face latérale 11, tels que un ou des gicleurs qui seraient disposés sous la face latérale 11 et orientés vers la tranche de la bande.It is also possible to provide the possibility of cooling the edge of the strip by projection of a fluid (water, nitrogen or liquid argon ...) between the lower edge of the part active 3 of the side face 11 and the neck 7. This cooling can be carried out so permanent, to ensure that the edge of the strip is always sufficiently solidified to prevent it from tearing, allowing liquid metal to escape. It can also be performed only when the initiation of such a tear in the shore is observed, or when the monitoring the casting parameters makes one suspect the risk of the appearance of such a tear. As means for supplying cooling fluid to the edge of the strip, it is possible to use, for example, one or more conduits 14 passing through the support plate 2 and opening into the space 15 between the support plate 2, the edges 4 of the cylinders 5, 5 'and the neck 7. But one can imagine other means of supplying fluid, which would be possibly independent of the lateral face 11, such as one or more sprinklers which would arranged under the lateral face 11 and oriented towards the edge of the strip.

Un indicateur de l'efficacité de l'invention est le nombre de reculs de la face latérale que l'on observe pendant la coulée. On a ainsi constaté que ce nombre pouvait être divisé par trois sur l'ensemble d'une coulée, par rapport à l'utilisation de faces latérales descendant jusque sous le col. L'amélioration est encore plus sensible lorsqu'on considère les premières minutes de la coulée, pendant lesquelles le fonctionnement de la machine de coulée n'est pas toujours parfaitement stabilisé. Ces constatations ont été faites lors de la coulée d'acier inoxydable austénitique de type SUS 304 coulé en bandes de 3 mm d'épaisseur, avec une distance "d" égale à 25 mm et un diamètre de cylindres de 1500 mm.An indicator of the effectiveness of the invention is the number of setbacks from the lateral face that we observe during casting. It was thus found that this number could be divided by three on the whole of a casting, compared to the use of descending side faces down to the neck. The improvement is even more noticeable when we consider the first minutes of casting, during which the operation of the casting machine is not always perfectly stabilized. These findings were made during the steel casting austenitic stainless steel type SUS 304 cast in 3 mm thick strips, with a distance "d" equal to 25 mm and a cylinder diameter of 1500 mm.

L'adaptation de telles faces latérales à une installation de coulée déjà existante peut, le cas échéant, nécessiter d'apporter quelques modifications au mannequin, de manière à ce que tout l'espace de coulée 6 soit obturé latéralement lors de son remplissage, avant le début de la coulée.The adaptation of such side faces to an already existing casting installation can, if necessary, make some modifications to the manikin, so that that the entire pouring space 6 is closed laterally during filling, before the start of casting.

Il va de soi que l'application de l'invention n'est pas limitée à la configuration précise de face latérale qui vient d'être donnée en exemple, mais est applicable à toute autre configuration qui autorise une interruption de la partie active au-dessus du col. It goes without saying that the application of the invention is not limited to the configuration precise from the side which has just been given as an example, but is applicable to any other configuration which allows the active part to be interrupted above the neck.

Bien entendu, l'invention est applicable non seulement à la coulée entre cylindres de bandes d'acier et autres alliages ferreux, mais de tout autre métal susceptible d'être coulé par cette méthode.Of course, the invention is applicable not only to casting between cylinders of strips of steel and other ferrous alloys, but of any other metal liable to be cast by this method.

Claims (6)

Face latérale (11) pour l'obturation de l'espace de coulée (6) d'une installation de coulée continue de bandes métalliques du type comportant deux cylindres (5, 5') contrarotatifs refroidis intérieurement, à axes horizontaux, dont les surfaces latérales cylindriques définissent un espace de coulée (6) dont la largeur au col (7) détermine l'épaisseur de la bande, ladite face latérale (11) présentant une partie active (3) destinée à frotter contre les chants (4) des cylindres (5, 5') en cours de coulée et à faire face audit espace de coulée (6), caractérisée en ce que les dimensions de ladite partie active (3) sont telles que son bord inférieur (12) est destiné à être situé à une distance (d) égale à au moins 1 mm au-dessus du col (7) lorsque la face latérale (11) est montée sur l'installation de coulée.Side face (11) for closing off the pouring space (6) of a continuous casting of metal strips of the type comprising two cylinders (5, 5 ') internally cooled counter-rotating, horizontal axes, including side surfaces cylindrical define a casting space (6) whose width at the neck (7) determines the thickness of the strip, said lateral face (11) having an active part (3) intended to rub against the edges (4) of the cylinders (5, 5 ') during casting and to face said audit pouring space (6), characterized in that the dimensions of said active part (3) are such that its lower edge (12) is intended to be located at a distance (d) equal to at least 1 mm above the neck (7) when the side face (11) is mounted on the installation of casting. Face latérale selon la revendication 1, caractérisée en ce que ledit bord inférieur (12) présente un arrondi (13) face à l'espace de coulée (6).Side face according to claim 1, characterized in that said lower edge (12) has a rounded (13) facing the casting space (6). Face latérale selon la revendication 1 ou 2, caractérisée en ce que ledit bord inférieur (12) présente un biseautage face à l'espace de coulée (6).Side face according to claim 1 or 2, characterized in that said edge lower (12) has a bevel facing the casting space (6). Face latérale selon l'une des revendications 1 à 3, caractérisée en ce que ladite partie active (3) est montée sur une plaque support (2), et en ce que ladite plaque support (2) comporte au moins un conduit (14) qui la traverse et débouche dans l'espace (15) compris entre la plaque support (2), les chants (4) des cylindres (5, 5') et le col (7), ledit conduit (14) pouvant être connecté à des moyens d'injection d'un fluide de refroidissement.Side face according to one of Claims 1 to 3, characterized in that the said active part (3) is mounted on a support plate (2), and in that said support plate (2) comprises at least one conduit (14) which passes through it and opens into the space (15) between the support plate (2), the edges (4) of the cylinders (5, 5 ') and the neck (7), said conduit (14) which can be connected to means for injecting a cooling fluid. Installation de coulée continue de bandes métalliques du type comportant deux cylindres (5, 5') contrarotatifs refroidis intérieurement, à axes horizontaux, dont les surfaces latérales cylindriques définissent un espace de coulée (6) dont la largeur au col (7) détermine l'épaisseur de la bande, et deux faces latérales d'obturation de son espace de coulée, caractérisée en ce que lesdites faces latérales sont du type selon l'une des revendications 1 à 4.Installation for continuous casting of metal strips of the type comprising two internally cooled, counter-rotating cylinders (5, 5 ') with horizontal axes, the surfaces of which cylindrical sides define a casting space (6) whose width at the neck (7) determines the thickness of the strip, and two lateral faces closing off its space casting, characterized in that said lateral faces are of the type according to one of claims 1 to 4. Installation selon la revendication 5, caractérisée en ce qu'elle comporte des moyens pour projeter un fluide de refroidissement sur la tranche de la bande au-dessus du col (7).Installation according to claim 5, characterized in that it comprises means for projecting a coolant onto the edge of the strip above the collar (7).
EP98402164A 1997-09-12 1998-09-02 Side wall for confining the casting space in a continuous roll caster installation for the production of metallic strips and casting installation equipped therewith Expired - Lifetime EP0901851B1 (en)

Applications Claiming Priority (2)

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FR9711351 1997-09-12
FR9711351A FR2768354B1 (en) 1997-09-12 1997-09-12 SIDE PANEL FOR SHUTTERING THE CASTING SPACE OF A CONTINUOUS CASTING INSTALLATION OF METAL STRIPS BETWEEN CYLINDERS, AND CASTING INSTALLATION THUS EQUIPPED

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
FR2842130A1 (en) * 2002-07-12 2004-01-16 Usinor SIDE SIDE FOR INSTALLATION OF CONTINUOUS CASTING OF METAL STRIPS BETWEEN TWO CYLINDERS

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JP4216340B2 (en) * 1996-10-18 2009-01-28 ミシュラン ルシェルシュ エ テクニーク ソシエテ アノニム Aqueous coagulant for liquid crystal solutions based on cellulose materials
AT412195B (en) * 2002-06-25 2004-11-25 Voest Alpine Ind Anlagen METHOD FOR PRODUCING A METAL STRIP WITH A TWO-ROLLING CASTING DEVICE

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212423A2 (en) * 1985-08-05 1987-03-04 Hitachi, Ltd. Continuous casting apparatus of twin-drum type
EP0360635A1 (en) * 1988-09-14 1990-03-28 Usinor Sacilor Side wall for a continuous casting plant between movable walls, installations with walls, method suitable for contiuous casting thin metallic products
EP0432073A1 (en) * 1989-12-07 1991-06-12 USINOR SACILOR Société Anonyme Device for continuous casting thin metallic products between two rolls

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212423A2 (en) * 1985-08-05 1987-03-04 Hitachi, Ltd. Continuous casting apparatus of twin-drum type
EP0360635A1 (en) * 1988-09-14 1990-03-28 Usinor Sacilor Side wall for a continuous casting plant between movable walls, installations with walls, method suitable for contiuous casting thin metallic products
EP0432073A1 (en) * 1989-12-07 1991-06-12 USINOR SACILOR Société Anonyme Device for continuous casting thin metallic products between two rolls

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2842130A1 (en) * 2002-07-12 2004-01-16 Usinor SIDE SIDE FOR INSTALLATION OF CONTINUOUS CASTING OF METAL STRIPS BETWEEN TWO CYLINDERS
WO2004007116A2 (en) * 2002-07-12 2004-01-22 Usinor Lateral face of an installation used for the twin-roll continuous casting of metal bands
WO2004007116A3 (en) * 2002-07-12 2004-04-08 Usinor Lateral face of an installation used for the twin-roll continuous casting of metal bands
US7258157B2 (en) 2002-07-12 2007-08-21 Unisor Lateral face of an installation used for the twin-roll continuous casting of metal bands

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DE69813120T2 (en) 2004-01-29
SK123598A3 (en) 1999-06-11
PL328526A1 (en) 1999-03-15
CN1212914A (en) 1999-04-07
DK0901851T3 (en) 2003-07-28
FR2768354A1 (en) 1999-03-19
CN1074328C (en) 2001-11-07
AU8312298A (en) 1999-03-25
RO119996B1 (en) 2005-07-29
JPH11151556A (en) 1999-06-08
ES2196512T3 (en) 2003-12-16
TW504414B (en) 2002-10-01
DE69813120D1 (en) 2003-05-15
EP0901851B1 (en) 2003-04-09
IN188785B (en) 2002-11-09
FR2768354B1 (en) 1999-10-22
TR199801783A3 (en) 1999-10-21
ATE236749T1 (en) 2003-04-15
PT901851E (en) 2003-07-31
CZ287998A3 (en) 1999-08-11
RU2208497C2 (en) 2003-07-20
KR19990029727A (en) 1999-04-26
BR9803422A (en) 1999-11-03
CA2247538A1 (en) 1999-03-12
ZA988049B (en) 1999-03-05

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