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EP0241445A1 - Method and apparatus for cooling a continuously cast metal product - Google Patents

Method and apparatus for cooling a continuously cast metal product Download PDF

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Publication number
EP0241445A1
EP0241445A1 EP87870033A EP87870033A EP0241445A1 EP 0241445 A1 EP0241445 A1 EP 0241445A1 EP 87870033 A EP87870033 A EP 87870033A EP 87870033 A EP87870033 A EP 87870033A EP 0241445 A1 EP0241445 A1 EP 0241445A1
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EP
European Patent Office
Prior art keywords
metal product
product
box
cooling
orifices
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
EP87870033A
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German (de)
French (fr)
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EP0241445B1 (en
Inventor
Paul Naveau
Stéphan Wilmotte
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.)
Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to AT87870033T priority Critical patent/ATE47061T1/en
Publication of EP0241445A1 publication Critical patent/EP0241445A1/en
Application granted granted Critical
Publication of EP0241445B1 publication Critical patent/EP0241445B1/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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

  • the present invention relates to a device for cooling a metallic product, in particular steel, which is continuously cast, and to a method of using this device.
  • the continuous casting of a metal product is a method which consists in casting the molten metal in a bottomless ingot mold generally animated by an oscillating movement and whose walls are cooled vigorously. Under the effect of this vigorous cooling, the skin of the cast metal solidifies rapidly and forms a solid crust surrounding the molten metal which forms the liquid well. Partly solidified product The solid is then continuously extracted from the ingot mold and passes through a secondary cooling zone where it completes its cooling and therefore solidifies.
  • the presence of the liquid well causes the existence of a ferrostatic pressure inside the product.
  • This ferrostatic pressure acts from the inside on the solidified skin and it can give rise to breakthroughs, that is to say tears in the skin, in places where the skin does not offer sufficient resistance.
  • Such weak points result in particular from irregular cooling or insufficient support of the product in the secondary cooling zone.
  • Conventional equipment in a secondary cooling zone consists of support and guide rollers, between which are devices for spraying water, for example sprinklers.
  • the use of such equipment involves two major drawbacks which can lead to the aforementioned weak points.
  • the metal is only firmly supported according to the generators of contact with the rollers, which presents a serious risk of breakthrough between two rollers and gives rise to deformations in the form of bulges.
  • the cooling nozzles alternate with the rollers on the path of the product. It therefore undergoes a succession of cooling and heating, that is to say a series of thermal cycles which do not allow regular cooling and therefore affect the regularity of the thickness of the solidified skin.
  • Patent DE-C-21 43 962 describes a device for cooling and guiding a continuously cast product, comprising a grid in the meshes of which are arranged sprinklers.
  • the grid is applied against the solidified side face of the product which it guides.
  • the cooling obtained is not uniform over the entire surface.
  • the present invention discloses a device making it possible to remedy the aforementioned drawbacks and to ensure intense and homogeneous cooling of the entire surface of the product while guaranteeing an integral and uniform support of the product in the secondary cooling zone.
  • the device for cooling a continuously cast metal product essentially consists of at least one box having a flat wall pierced with orifices called the front wall, and equipped with means for supplying coolant. under pressure, each box being arranged in the secondary cooling zone of said metal product so that its wall pierced with orifices faces a face of the metal product, at a certain distance from the latter.
  • the box it has proved advantageous to arrange the box so that its wall forms with the transverse median plane of the product an angle between 0 ° and 1 ° in the direction of travel of the product.
  • the transverse median plane of the product is the vertical plane carried out at mid-thickness of the product parallel to the large faces of the latter.
  • the orifices are slots oriented transversely relative to the product when the box is placed in the secondary cooling zone.
  • these slots are inclined, in the direction of travel of the metal product, by an angle ⁇ of between 20 ° and 70 ° relative to the horizontal.
  • this angle ⁇ will be close to 60 °, in order to give the liquid a sufficient movement component in the direction of movement of the metal product.
  • the section of said orifices, and in particular the width of the slots, is adjustable by suitable means.
  • the orifices are regularly distributed in the front wall of the box, in order to ensure a homogeneous distribution of the coolant.
  • FIG. 1 schematically represents and without any limiting character, a device for cooling a steel slab continuously cast.
  • the slab 1 leaving the continuous casting mold 2 enters the secondary cooling zone where is installed the device of the invention generally designated by the reference 3.
  • This device consists of two boxes 4.5 which each have a flat front wall 6, 7 facing the slab 1.
  • the two boxes 4.5 are arranged at a distance as small as possible from the mold. However, if this distance allows, there may be provided, between the mold and the boxes, support rollers known per se, not shown.
  • the two boxes 4,5 are arranged opposite the large faces of the slab 1, at the same level and in such a way that their respective flat walls 6,7 are inclined on the median plane of the slab. This inclination is accentuated here to make it perceptible but in practice, it does not exceed 1 °.
  • These slots 9, 10 have an adjustable width e.
  • the boxes 4.5 also include means 11, 12 for supplying coolant, as well as flow meters 13, 14 for controlling the flow of liquid and manometers 15, 16 for monitoring the pressure prevailing inside the boxes.
  • the steel slab 1 When the steel slab 1 leaves the continuous casting mold 2, it has a relatively thin solidified skin surrounding the liquid well 8.
  • the boxes 4,5 are supplied with pressurized water respectively by the pipes 11, 12 and this water s 'flows through the slots 9, 10 to fill the space formed between the boxes 4 and 5.
  • the slab 1 entering this space is subjected to the action of the coolant, generally water, which circulates there. It thus undergoes intense and homogeneous cooling which results in the rapid solidification of the metal of the liquid well and consequently the increase in the thickness of the solidified skin. Care should be taken to ensure a sufficient flow of coolant to limit the heating of this coolant and in any case avoid its boiling, as this would cause the rise of water vapor towards the mold.
  • the slab In this space between the boxes, the slab is not in contact with any support member. It is only subjected to the action of the pressurized coolant which, in addition to its cooling effect, also provides compensation for the ferrostatic pressure applied by the metal of the liquid well. As the pressure exerted by the coolant layer is applied uniformly over the entire surface of the slab, the ferrostatic pressure is compensated at all points and there is no longer any risk of breakthrough.
  • FIG. 2 illustrates the distribution of the pressure P exerted on the surface of the slab along the height H of the boxes, for different flow rates of coolant.
  • the device and the method of the invention therefore make it possible to ensure rapid and homogeneous cooling of a continuously cast metal product, as well as the continuous support of this product throughout the duration of its solidification.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

1. Device for the cooling of a continuously cast metal product (1), which is composed of at least one box (4; 5) having a plane wall (6; 7) pierced with orifices (9; 10), called a front wall, and equipped with means (11; 12) for the supply of cooling fluid under pressure, each box being arranged in the secondary cooling zone of the said metal product (1), in such a way that its front wall is turned towards one face of the metal product at some distance from this, characterized in that the said front wall (6; 7) of the said boxes (4; 5) is inclined at an angle of between 0 degree and 1 degree relative to the transverse midplane of the metal product (1) to be cooled, in such a way that the distance between the said front wall (6; 7) and the corresponding face of the metal product increases in the direction of travel of the said product (1).

Description

La présente invention porte sur un dispositif pour le re­froidissement d'un produit métallique, en particulier en acier, coulé en continu, et sur un procédé de mise en oeu­vre de ce dispositif.The present invention relates to a device for cooling a metallic product, in particular steel, which is continuously cast, and to a method of using this device.

On sait que la coulée continue d'un produit métallique est une méthode qui consiste à couler le métal en fusion dans une lingotière sans fond généralement animée d'un mouvement d'oscillation et dont les parois sont refroi­dies énergiquement. Sous l'effet de ce refroidissement énergique, la peau du métal coulé se solidifie rapidement et forme une croûte solide entourant du métal en fusion qui forme le puits liquide. Le produit en partie solidi­ fié est alors extrait en continu de la lingotière et il traverse une zone de refroidissement secondaire où il a­chève son refroidissement et dès lors sa solidification.It is known that the continuous casting of a metal product is a method which consists in casting the molten metal in a bottomless ingot mold generally animated by an oscillating movement and whose walls are cooled vigorously. Under the effect of this vigorous cooling, the skin of the cast metal solidifies rapidly and forms a solid crust surrounding the molten metal which forms the liquid well. Partly solidified product The solid is then continuously extracted from the ingot mold and passes through a secondary cooling zone where it completes its cooling and therefore solidifies.

La présence du puits liquide entraîne l'existence d'une pression ferrostatique à l'intérieur du produit. Cette pression ferrostatique agit par l'intérieur sur la peau solidifiée et elle peut donner lieu à des percées, c'est-­à-dire à des déchirures de la peau, aux endroits où la peau n'offre pas une résistance suffisante. De tels points faibles résultent notamment d'un refroidissement irrégu­lier ou d'un soutien insuffisant du produit dans la zone de refroidissement secondaire.The presence of the liquid well causes the existence of a ferrostatic pressure inside the product. This ferrostatic pressure acts from the inside on the solidified skin and it can give rise to breakthroughs, that is to say tears in the skin, in places where the skin does not offer sufficient resistance. Such weak points result in particular from irregular cooling or insufficient support of the product in the secondary cooling zone.

L'équipement classique d'une zone de refroidissement se­condaire est constitué de rouleaux de support et de gui­dage, entre lesquels sont situés des dispositifs de pro­jection d'eau, par exemple des gicleurs.Conventional equipment in a secondary cooling zone consists of support and guide rollers, between which are devices for spraying water, for example sprinklers.

Le recours à un tel équipement entraîne cependant deux in­convénients majeurs pouvant conduire aux points faibles précités. D'une part, le métal n'est fermement soutenu que selon les génératrices de contact avec les rouleaux, ce qui présente un sérieux risque de percée entre deux rou­leaux et donne lieu à des déformations en forme de bombe­ments. D'autre part, les gicleurs de refroidissement al­ternent avec les rouleaux sur la trajectoire du produit. Celui-ci subit donc une succession de refroidissements et de réchauffements, c'est-à-dire une série de cycles ther­miques qui ne permettent pas de réaliser un refroidisse­ment régulier et nuisent par conséquent à la régularité de l'épaisseur de la peau solidifiée.The use of such equipment, however, involves two major drawbacks which can lead to the aforementioned weak points. On the one hand, the metal is only firmly supported according to the generators of contact with the rollers, which presents a serious risk of breakthrough between two rollers and gives rise to deformations in the form of bulges. On the other hand, the cooling nozzles alternate with the rollers on the path of the product. It therefore undergoes a succession of cooling and heating, that is to say a series of thermal cycles which do not allow regular cooling and therefore affect the regularity of the thickness of the solidified skin.

Par le brevet BE-A-675.403, on connaît un dispositif des­tiné à refroidir un métal coulé en continu, au moyen de corps refroidisseurs que l'on applique contre le produit métallique en cours de solidification. Ces corps refroi­disseurs sont disposés par paires successives séparées par des intervalles. Ils ne permettent pas d'assurer un re­froidissement régulier et suffisant et un soutien continu du produit dans toute la zone de refroidissement secondai­re. En outre, ils sont sujets à l'usure et leur installa­tion est assez compliquée.From patent BE-A-675,403, a device is known for cooling a continuously cast metal, by means of cooling bodies which are applied against the metal product being solidified. These cooling bodies are arranged in successive pairs separated by intervals. They do not ensure regular and sufficient cooling and continuous support of the product throughout the secondary cooling zone. In addition, they are subject to wear and their installation is quite complicated.

Le brevet DE-C-21 43 962 décrit un dispositif pour refroi­dir et guider un produit coulé en continu, comportant une grille dans les mailles de laquelle sont disposés des gi­cleurs. La grille est appliquée contre la face latérale solidifiée du produit dont elle assure le guidage. Il se pose également ici des problèmes d'usure de la grille et de détérioration de la qualité du surface du produit. En outre, le refroidissement obtenu n'est pas homogène sur toute la surface.Patent DE-C-21 43 962 describes a device for cooling and guiding a continuously cast product, comprising a grid in the meshes of which are arranged sprinklers. The grid is applied against the solidified side face of the product which it guides. There are also problems here with wear of the grid and deterioration in the quality of the surface of the product. In addition, the cooling obtained is not uniform over the entire surface.

La présente invention révèle un dispositif permettant de remédier aux inconvénients précités et d'assurer un re­froidissement intense et homogène de toute la surface du produit tout en garantissant un support intégral et uni­forme du produit dans la zone de refroidissement secon­daire.The present invention discloses a device making it possible to remedy the aforementioned drawbacks and to ensure intense and homogeneous cooling of the entire surface of the product while guaranteeing an integral and uniform support of the product in the secondary cooling zone.

Conformément à la présente invention, le dispositif de re­froidissement d'un produit métallique coulé en continu se compose essentiellement d'au moins un caisson comportant une paroi plane percée d'orifices dite paroi antérieure, et équipé de moyens d'alimentation en liquide de refroi­dissement sous pression, chaque caisson étant disposé dans la zone de refroidissement secondaire dudit produit métal­lique de telle façon que sa paroi percée d'orifices soit tournée vers une face du produit métallique, à une certai­ne distance de celui-ci.According to the present invention, the device for cooling a continuously cast metal product essentially consists of at least one box having a flat wall pierced with orifices called the front wall, and equipped with means for supplying coolant. under pressure, each box being arranged in the secondary cooling zone of said metal product so that its wall pierced with orifices faces a face of the metal product, at a certain distance from the latter.

Selon l'invention, il s'est avéré avantageux de disposer le caisson de telle façon que sa paroi forme avec le plan mé­dian transversal du produit un angle compris entre 0° et 1° dans le sens de défilement du produit.According to the invention, it has proved advantageous to arrange the box so that its wall forms with the transverse median plane of the product an angle between 0 ° and 1 ° in the direction of travel of the product.

Le plan médian transversal du produit est le plan vertical mené à mi-épaisseur du produit parallèlement aux grandes faces de celui-ci.The transverse median plane of the product is the vertical plane carried out at mid-thickness of the product parallel to the large faces of the latter.

Cette disposition avantageuse entraîne la formation d'un coin d'eau qui empêche la remontée de liquide de refroidis­sement vers la lingotière. Cet effet de coin est encore ac­centué par le retrait du produit au refroidissement.This advantageous arrangement results in the formation of a water wedge which prevents the coolant from rising back to the mold. This wedge effect is further accentuated by the withdrawal of the product on cooling.

Selon une réalisation intéressante du dispositif de l'in­vention, les orifices sont des fentes orientées transver­salement par rapport au produit lorsque le caisson est mis en place dans la zone de refroidissement secondaire.According to an advantageous embodiment of the device of the invention, the orifices are slots oriented transversely relative to the product when the box is placed in the secondary cooling zone.

Egalement selon l'invention, ces fentes sont inclinées, dans le sens de défilement du produit métallique, d'un an­gle α compris entre 20° et 70° par rapport à l'horizon­tale.Also according to the invention, these slots are inclined, in the direction of travel of the metal product, by an angle α of between 20 ° and 70 ° relative to the horizontal.

Avantageusement, cet angle α sera voisin de 60°, afin de conférer au liquide une composante de mouvement suffisante dans le sens du déplacement du produit métallique.Advantageously, this angle α will be close to 60 °, in order to give the liquid a sufficient movement component in the direction of movement of the metal product.

Selon l'invention, la section desdits orifices, et en par­ticulier la largeur des fentes, est réglable par des moy­ens appropriés.According to the invention, the section of said orifices, and in particular the width of the slots, is adjustable by suitable means.

Toujours selon l'invention, les orifices, respectivement les fentes, sont régulièrement répartis dans la paroi an­térieure du caisson, afin d'assurer une distribution ho­mogène du liquide de refroidissement.Still according to the invention, the orifices, respectively the slots, are regularly distributed in the front wall of the box, in order to ensure a homogeneous distribution of the coolant.

D'autres particularités de l'invention pourront encore ap­paraître par la description qui va être faite du disposi­tif et de son procédé de mise en oeuvre, en se référant aux dessins annexés dans lesquels la

  • Fig.1 représente schématiquement un dispositif conforme à l'invention et illustre son procédé de mise en oeu­vre et la
  • Fig.2 présente un diagramme traduisant la distribution de la pression dans la couche de liquide de refroidis­sement pour différents débits d'alimentation de ce liquide.
Other features of the invention may also appear from the description which will be given of the device and of its method of implementation, with reference to the appended drawings in which the
  • Fig.1 shows schematically a device according to the invention and illustrates its implementation process and the
  • Fig. 2 presents a diagram showing the distribution of the pressure in the coolant layer for different feed rates of this coolant.

Dans ces figures, les mêmes éléments sont désignés par les mêmes repères numériques et les sens de circulation du li­quide sont indiqués par des flèches. Enfin, on a omis tout ce qui n'était pas essentiel pour la compréhension de l'in­vention.In these figures, the same elements are designated by the same numerical references and the directions of circulation of the liquid are indicated by arrows. Finally, everything that was not essential for understanding the invention has been omitted.

Pour illustrer cette description, on fera tout d'abord ré­férence à la figure 1 qui représente schématiquement et sans aucun caractère limitatif, un dispositif de refroidis­sement d'une brame d'acier coulée en continu.To illustrate this description, reference will first be made to FIG. 1 which schematically represents and without any limiting character, a device for cooling a steel slab continuously cast.

La brame 1 quittant la lingotière de coulée continue 2 pénètre dans la zone de refroidissement secondaire où est installé le dispositif de l'invention globalement désigné par le repère 3. Ce dispositif se compose de deux caissons 4,5 qui comportent chacun une paroi antérieure plane 6, 7 tournée vers la brame 1. Les deux caissons 4,5 sont dis­posés à une distance aussi faible que possible de la lin­gotière. Toutefois, si cette distance le permet, il peut être prévu, entre la lingotière et les caissons, des rou­leaux de support connus en soi, non représentés. Les deux caissons 4,5 sont disposés en face des grandes faces de la brame 1, au même niveau et de telle façon que leurs parois planes respectives 6,7 soient inclinées sur le plan median de la brame. Cette inclinaison est ici accentuée pour la rendre perceptible mais en pratique, elle ne dépasse pas 1°. Les caissons 4,5 sont encore montés de telle façon qu'­à un niveau quelconque, leurs parois planes se trouvent à la même distance de leur face respective de la brame 1. Ainsi, à son point le plus haut, chaque paroi plane 6,7 se trouve à une distance h₁ de sa face respective de la brame. En raison de l'inclinaison des caissons 4,5 la distance h entre un caisson et la face de la brame augmente de h₁ en haut à h₂ en bas, avec h₁ < h₂. Par exemple, h₁ = 1 mm et h₂ = 4 mm pour une hauteur de caisson de 60 cm.The slab 1 leaving the continuous casting mold 2 enters the secondary cooling zone where is installed the device of the invention generally designated by the reference 3. This device consists of two boxes 4.5 which each have a flat front wall 6, 7 facing the slab 1. The two boxes 4.5 are arranged at a distance as small as possible from the mold. However, if this distance allows, there may be provided, between the mold and the boxes, support rollers known per se, not shown. The two boxes 4,5 are arranged opposite the large faces of the slab 1, at the same level and in such a way that their respective flat walls 6,7 are inclined on the median plane of the slab. This inclination is accentuated here to make it perceptible but in practice, it does not exceed 1 °. The boxes 4.5 are also mounted in such a way that at any level, their planar walls are at the same distance from their respective face of the slab 1. Thus, at its highest point, each planar wall 6, 7 is located at a distance h₁ from its respective face of the slab. Due to the inclination of the boxes 4,5 the distance h between a box and the face of the slab increases from h₁ at the top to h₂ at the bottom, with h₁ <h₂. For example, h₁ = 1 mm and h₂ = 4 mm for a box height of 60 cm.

Les faces planes 6,7 des caissons 4,5 sont percées de fen­tes telles que 9, 10 qui sont inclinées d'un angle α = 30° par rapport à l'horizontale, dans le sens de défilement de la brame 1. Ces fentes 9, 10 présentent une largeur e ré­glable.The flat faces 6,7 of the boxes 4,5 are pierced with slots such as 9, 10 which are inclined at an angle α = 30 ° relative to the horizontal, in the direction of travel of the slab 1. These slots 9, 10 have an adjustable width e.

Les caissons 4,5 comportent encore des moyens 11, 12 d'a­limentation en liquide de refroidissement, ainsi que des débitmètres 13, 14 pour contrôler le débit de liquide et des manomètres 15, 16 permettant de surveiller la pression régnant à l'intérieur des caissons.The boxes 4.5 also include means 11, 12 for supplying coolant, as well as flow meters 13, 14 for controlling the flow of liquid and manometers 15, 16 for monitoring the pressure prevailing inside the boxes.

Le procédé de refroidissement d'un produit métallique cou­lé en continu, qui fait aussi partie de la présente inven­tion, peut également être présenté en faisant référence à la figure 1.The method of cooling a continuously cast metal product, which is also part of the present invention, can also be presented with reference to Figure 1.

Lorsque la brame d'acier 1 quitte la lingotière de coulée continue 2, elle présente une peau solidifiée relativement mince entourant le puits liquide 8. Les caissons 4,5 sont alimentés en eau sous pression respectivement par les con­duites 11, 12 et cette eau s'écoule par les fentes 9, 10 pour remplir l'espace formé entre les caissons 4 et 5. La brame 1 pénétrant dans cet espace est soumise à l'action du liquide de refroidissement, généralement de l'eau, qui y circule. Elle subit ainsi un refroidissement intense et ho­mogène qui entraîne la solidification rapide du métal du puits liquide et par conséquent l'accroissement de l'épais­seur de la peau solidifiée. Il convient de veiller à assu­rer un débit de liquide de refroidissement suffisant pour limiter l'échauffement de ce liquide et en tout cas éviter son ébullition, car ceci entraînerait la remontée de vapeur d'eau vers la lingotière.When the steel slab 1 leaves the continuous casting mold 2, it has a relatively thin solidified skin surrounding the liquid well 8. The boxes 4,5 are supplied with pressurized water respectively by the pipes 11, 12 and this water s 'flows through the slots 9, 10 to fill the space formed between the boxes 4 and 5. The slab 1 entering this space is subjected to the action of the coolant, generally water, which circulates there. It thus undergoes intense and homogeneous cooling which results in the rapid solidification of the metal of the liquid well and consequently the increase in the thickness of the solidified skin. Care should be taken to ensure a sufficient flow of coolant to limit the heating of this coolant and in any case avoid its boiling, as this would cause the rise of water vapor towards the mold.

Dans cet espace entre les caissons la brame n'est en con­tact avec aucun organe de support. Elle n'est soumise qu'à l'action du liquide de refroidissement sous pression qui, outre son effet de refroidissement, assure également la compensation de la pression ferrostatique appliquée par le métal du puits liquide. Comme la pression exercée par la couche de liquide de refroidissement est appliquée unifor­mément sur toute la surface de la brame, la pression fer­rostatique est compensée en tout point et il n'y a plus de risque de percée.In this space between the boxes, the slab is not in contact with any support member. It is only subjected to the action of the pressurized coolant which, in addition to its cooling effect, also provides compensation for the ferrostatic pressure applied by the metal of the liquid well. As the pressure exerted by the coolant layer is applied uniformly over the entire surface of the slab, the ferrostatic pressure is compensated at all points and there is no longer any risk of breakthrough.

Enfin, l'inclinaison des fentes et l'effet de coin résul­tant de l'augmentation de la distance h limitent fortement l'écoulement de l'eau en direction de la partie supérieure des caissons et réduisent dès lors le risque de projection d'eau sur la lingotière.Finally, the inclination of the slits and the wedge effect resulting from the increase in the distance h greatly limit the flow of water towards the upper part of the boxes and therefore reduce the risk of water spraying. on the mold.

La figure 2 illustre la répartition de la pression P exer­cée sur la surface de la brame le long de la hauteur H des caissons, pour différents débits de liquide de refroidis­sement.FIG. 2 illustrates the distribution of the pressure P exerted on the surface of the slab along the height H of the boxes, for different flow rates of coolant.

Les diagrammes correspondent à une hauteur de caisson de 60 cm, à des distances h₁ = 1 mm et h₂ = 4 mm et à des fen­tes inclinées de α = 30° et ayant une largeur e = 2,6 mm.The diagrams correspond to a box height of 60 cm, at distances h₁ = 1 mm and h₂ = 4 mm and with inclined slots of α = 30 ° and having a width e = 2.6 mm.

Les essais effectués dans ces conditions montrent que l'é­coulement de l'eau est régulier sur toute la largeur de la brame ainsi que sur la majeure partie de la hauteur des caissons. En outre, la pression exercée par la couche d'­eau sur la surface de la brame permet de compenser la pression ferrostatique, car celle-ci vaut environ 1 bar juste en-dessous de la lingotière.Tests carried out under these conditions show that the flow of water is regular over the entire width of the slab as well as over most of the height of the caissons. In addition, the pressure exerted by the water layer on the surface of the slab makes it possible to compensate for the ferrostatic pressure, since this is worth approximately 1 bar just below the mold.

Le dispositif et le procédé de l'invention permettent donc d'assurer un refroidissement rapide et homogène d'un pro­duit métallique coulé en continu, ainsi que le support con­tinu de ce produit pendant toute la durée de sa solidifi­cation.The device and the method of the invention therefore make it possible to ensure rapid and homogeneous cooling of a continuously cast metal product, as well as the continuous support of this product throughout the duration of its solidification.

Il est bien entendu que l'invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits, mais qu'­elle englobe également les diverses variantes entrant dans le cadre des revendications qui suivent.It is understood that the invention is not limited to the embodiments which have just been described, but that it also encompasses the various variants coming within the scope of the claims which follow.

Claims (9)

1. Dispositif pour le refroidissement d'un produit métal­lique coulé en continu, caractérisé en ce qu'il se compose d'au moins un caisson comportant une paroi plane percée d'­orifices dite paroi antérieure, et équipé de moyens d'ali­mentation en liquide de refroidissement sous pression, cha­que caisson étant disposé dans la zone de refroidissement secondaire dudit produit métallique de telle façon que sa paroi percée d'orifices soit tournée vers une face du pro­duit métallique, à une certaine distance de celui-ci.1. Device for cooling a continuously cast metal product, characterized in that it consists of at least one box having a flat wall pierced with orifices called the front wall, and equipped with liquid supply means pressure cooling, each box being arranged in the secondary cooling zone of said metal product so that its wall pierced with orifices faces towards a face of the metal product, at a certain distance from the latter. 2. Dispositif suivant la revendication 1, caractérisé en ce que les orifices sont des fentes orientées transversa­lement par rapport au produit lorsque le caisson est mis en place dans la zone de refroidissement secondaire.2. Device according to claim 1, characterized in that the orifices are slots oriented transversely relative to the product when the box is placed in the secondary cooling zone. 3. Dispositif suivant la revendication 2, caractérisé en ce que ces fentes sont inclinées dans le sens de défile­ment du produit métallique, d'un angle α compris entre 20° et 70° par rapport à l'horizontale.3. Device according to claim 2, characterized in that these slots are inclined in the direction of travel of the metal product, at an angle α between 20 ° and 70 ° relative to the horizontal. 4. Dispositif suivant la revendication 3, caractérisé en ce que l'angle α d'inclinaison des fentes est voisin de 60°.4. Device according to claim 3, characterized in that the angle α of inclination of the slots is close to 60 °. 5. Dispositif suivant l'une ou l'autre des revendications précédentes, caractérisé en ce qu'il comporte des moyens de réglage de la section desdits orifices, en particulier de la largeur desdites fentes.5. Device according to either of the preceding claims, characterized in that it comprises means for adjusting the section of said orifices, in particular the width of said slots. 6. Dispositif suivant l'une ou l'autre des revendications précédentes, caractérisé en ce que lesdits orifices, res­pectivement lesdites fentes, sont régulièrement répartis dans la paroi antérieure du caisson.6. Device according to either of the preceding claims, characterized in that said orifices, respectively said slots, are regularly distributed in the front wall of the box. 7. Dispositif suivant l'une ou l'autre des revendications précédentes, caractérisé en ce que la paroi antérieure desdits caissons est inclinée d'un angle compris entre 0° et 1° par rapport au plan médian transversal du produit métallique à refroidir.7. Device according to either of the preceding claims, characterized in that the front wall of said boxes is inclined at an angle between 0 ° and 1 ° relative to the transverse median plane of the metal product to be cooled. 8. Procédé pour le refroidissement d'un produit métalli­que coulé en continu à l'aide d'un dispositif suivant l'­une ou l'autre des revendications précédentes, caractérisé en ce que l'on alimente le caisson en liquide de refroi­dissement sous pression, en ce que l'on assure l'écoule­ment dudit liquide de refroidissement à travers les ori­fices, respectivement les fentes, ménagés dans la face antérieure du caisson, en ce que l'on forme entre le pro­duit métallique et la face antérieure du caisson une cou­che continue de liquide de refroidissement sous pression s'écoulant dans le sens de défilement du produits métalli­que et en ce que l'on règle la pression dans ladite couche de façon à compenser la pression ferrostatique régnant dans le produit.8. Method for cooling a continuously cast metal product using a device according to either of the preceding claims, characterized in that the casing is supplied with pressurized coolant , in that it ensures the flow of said coolant through the orifices, respectively the slots, formed in the front face of the box, in that there is formed between the metal product and the front face of the box a continuous layer of pressurized coolant flowing in the running direction of the metallic product and in that the pressure in said layer is adjusted so as to compensate for the ferrostatic pressure prevailing in the product. 9. Procédé suivant la revendication 8, caractérisé en ce que l'on forme une couche continue de liquide de refroi­dissement d'épaisseur croissante dans le sens de défile­ment du produit métallique.9. Method according to claim 8, characterized in that a continuous layer of coolant of increasing thickness is formed in the direction of travel of the metal product.
EP87870033A 1986-03-18 1987-03-09 Method and apparatus for cooling a continuously cast metal product Expired EP0241445B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87870033T ATE47061T1 (en) 1986-03-18 1987-03-09 METHOD AND DEVICE FOR COOLING METAL CONTINUOUSLY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE648206 1986-03-18
BE6048206 1986-03-18

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EP0241445A1 true EP0241445A1 (en) 1987-10-14
EP0241445B1 EP0241445B1 (en) 1989-10-11

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EP (1) EP0241445B1 (en)
JP (1) JPH0783918B2 (en)
AT (1) ATE47061T1 (en)
ES (1) ES2011824B3 (en)

Cited By (2)

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EP0382702A2 (en) * 1989-02-10 1990-08-16 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method of manufacturing a thin steel slab by continuous casting
EP0650790A1 (en) * 1993-10-29 1995-05-03 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Method for thermal surface treatment in a continuous casting machine and relative device

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JPH0638604Y2 (en) * 1989-04-13 1994-10-12 住友金属工業株式会社 Slab support cooling device in continuous casting machine
JP2721281B2 (en) * 1991-09-19 1998-03-04 ワイケイケイ株式会社 Cooling method and mold for continuous casting
US7451804B2 (en) * 2006-11-22 2008-11-18 Peterson Oren V Method and apparatus for horizontal continuous metal casting in a sealed table caster
WO2018055918A1 (en) * 2016-09-23 2018-03-29 新日鐵住金株式会社 Device and method for cooling hot-rolled steel sheet

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EP0382702A2 (en) * 1989-02-10 1990-08-16 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method of manufacturing a thin steel slab by continuous casting
EP0382702A3 (en) * 1989-02-10 1991-06-12 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method of manufacturing a thin steel slab by continuous casting
EP0650790A1 (en) * 1993-10-29 1995-05-03 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Method for thermal surface treatment in a continuous casting machine and relative device
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Also Published As

Publication number Publication date
US4751960A (en) 1988-06-21
ES2011824B3 (en) 1990-02-16
ATE47061T1 (en) 1989-10-15
JPS62227562A (en) 1987-10-06
EP0241445B1 (en) 1989-10-11
JPH0783918B2 (en) 1995-09-13

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