EP0992593A1 - Method and device for continuous cooling of steel sheet - Google Patents
Method and device for continuous cooling of steel sheet Download PDFInfo
- Publication number
- EP0992593A1 EP0992593A1 EP99870192A EP99870192A EP0992593A1 EP 0992593 A1 EP0992593 A1 EP 0992593A1 EP 99870192 A EP99870192 A EP 99870192A EP 99870192 A EP99870192 A EP 99870192A EP 0992593 A1 EP0992593 A1 EP 0992593A1
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- European Patent Office
- Prior art keywords
- cooling
- sheet
- box
- tank
- water
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/63—Quenching devices for bath quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/565—Sealing arrangements
Definitions
- the present invention relates to a continuous cooling process of a sheet metal steel, in particular during cooling with boiling water of a moving steel sheet continuously, and a device for its implementation.
- the present invention takes place in the category of heat treatments involving cooling called “boiling water” or HOWAQ (hot water quenching), that is to say involving the immersion of the sheet in water at more than 95% of its boiling point expressed in ° C.
- This type of cooling is carried out continuously by passing the sheet through a tank containing boiling water and makes it possible to obtain sheets having a homogeneous distribution of the mechanical properties throughout the sheet as well as a satisfactory flatness after cooling. .
- HOWAQ hot water quenching
- the first element relates to the obligation to limit oneself to a temperature of the sheet at the cooling tank outlet greater than 290-320 ° C, otherwise it can be seen that the cooled sheet has a flatness defect.
- a sheet outlet temperature also high excludes the implementation of HOWAQ.
- the second element is fundamentally inherent in the very principle of the exchange of heat that operates between the sheet and boiling water and for which we find that we reach quickly a maximum value of the cooling rate.
- this value is also significantly lower than the speeds currently required by the evolution of heat treatments.
- the cooling rate HOWAQ maximum is around 60 ° C / s for a 0.8 mm thick sheet, so that we would like to reach more than 100 ° C / s, or even 500 to 1000 ° C / s for this range of products.
- the present invention provides a solution to the limitations of use in the context of boiling water cooling or HOWAQ and, significant economic advantage, its implementation makes it easy to adapt an existing HOWAQ industrial line to extend the range of sheets that can be processed there.
- the invention makes it possible to carry out what is usually called in technique a “full quench ", that is to say to arrive at an outlet temperature of the sheet of approximately 100 ° C. and this with speeds of the order of 500 ° C / s to 1000 ° C / s for 0.8 mm thickness.
- the goal is therefore to modify the conditions of execution of a cooling of the type HOWAQ usual in order to obtain a temperature of exit of the sheet more low and higher cooling intensities, while retaining the advantage a continuous cooling treatment of the sheet which can be implemented on an existing HOWAQ installation adapted at low cost.
- the basic idea is to install a cooling box of the "black boxes" type, that is to say boxes comprising devices, such as sprinklers, which project fluid under pressure towards the surface of the sheet to be cooled during the passage of said sheet in the box in question.
- Figure 1 is an overview of a HOWAQ type cooling installation
- Figure 2 is a partial view relating to the part directly concerned by the present invention.
- the sheet (1) comes out of an enclosure (2) relating to the previous treatment of the sheet (1) under a particular atmosphere and is introduced via the airlock (3), comprising for example in the exposed case 2 pairs of rollers, in a tank (4) containing boiling water (5).
- the sheet (1) plunges into the tank (4), passes over a system of bottom return rollers (6) mounted on a cradle (7) which is movable vertically in the tank (4) to allow modification of the passage time of the sheet (1) in the water (5), and finally, the sheet (1) leaves the tank (4) via an outlet airlock (8) and is directed to other stages (14) of its development.
- the proposed solution is to arrange the cooling box so that obtain identical levels of coolants in the tank and the box. Due to the lack of static pressure difference between the inside and the outside of the separate cooling box, there are practically negligible leaks to HOWAQ tank.
- the process of continuous cooling of a steel sheet (1), object of the present invention, said sheet (1) being in continuous travel and at a temperature between 680 ° C and 850 ° C, is essentially characterized in that the sheet metal (1) is cooled by passing through a tank (4) containing a water bath (5) maintained at a temperature greater than 95% of its boiling point expressed in ° C, as applied to the sheet (1) a second cooling operation distinct from the first and which takes place in the final phase of the first, in what we use for this second cooling operation a separate cooling device (9), hereinafter called cooling box, in that we pass the sheet (1) in the box cooling (9), in that said cooling box (9) is constructed and in that that it is placed in the tank (4) so that the sheet (1) enters said box cooling (9) at a point below the level (10) of the water (5) in the tank (4) and in that a fluid is projected towards the sheet (1) during its passage inside said cooling box (9).
- a separate cooling device (9), hereinafter called cooling box in that we pass the sheet (1) in the box cooling
- one projects in the cooling box (9) towards the sheet (1) a fluid whose temperature is included between 20 and 100 ° C.
- water is used as fluid sprayed into the cooling box (9).
- the temperature of the steel sheet (1) at the inlet of the cooling box (9) is varies the temperature of the steel sheet (1) at the inlet of the cooling box (9) by modifying the immersion time of said sheet (1) in the water (5) of the tank (4) before that it does not enter the cooling box (9); preferably, we modify the length of the path traveled by said sheet (1) in the tank (4) by moving vertically the cradle (7) supporting the bottom return rollers (6).
- the present invention also relates to a device for implementing the modalities of the process of the present invention.
- the cooling device for implementing the cooling process in continuous of a steel sheet (1) in continuous travel, object of the present invention comprising a tank (4) filled with water (5) at a temperature above 95% of its boiling point expressed in ° C in which the sheet (1) plunges and then rises after passing over bottom return rollers (6), is essentially characterized by what it includes a cooling means (9), called cooling box, arranged on the path followed by the sheet (1) so that it enters the box cooling (9) below the free surface (10) of the water (5) in the tank (4).
- a cooling means (9), called cooling box arranged on the path followed by the sheet (1) so that it enters the box cooling (9) below the free surface (10) of the water (5) in the tank (4).
- the box cooling (9) is a box supplied with pressurized fluid and provided elements for projecting a fluid towards the sheet metal (1), for example holes or nozzles, in a density of between 400 and 2,000 elements per m2 of active surface in projection.
- the cooling box (9) is provided with means (12) and (13) intended both to limit the leakage towards the tank (4) of the fluid projected towards the sheet (1) inside the box cooling (9) than to prevent the entry of water from the tank (4) into the box cooling (9):
- the circuit supplying the cooling box comprises systems capable to regulate the working conditions of the sprayed fluid, preferably its temperature.
- a cradle (7) supports the bottom return rollers (6) and is movable vertically, allowing in this way to modify the passage time of the sheet (1) in the tank (4)
- airlocks (3) and (8) are disposed respectively at the inlet and at the outlet of the steel sheet (1) respectively in and out of the enclosure comprising the tank (4) so isolate the enclosure containing the tank (4) from the atmospheres prevailing in the enclosures respectively (2) from which the sheet metal (1) and (14) to which it is originating directs after cooling.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
La présente invention a trait à un procédé de refroidissement en continu d'une tôle en acier, en particulier lors d'un refroidissement à l'eau bouillante d'une tôle en acier défilant en continu, et à un dispositif pour sa mise en oeuvre.The present invention relates to a continuous cooling process of a sheet metal steel, in particular during cooling with boiling water of a moving steel sheet continuously, and a device for its implementation.
L'utilisation intensive de l'acier en tant que matériau constitutif dans divers domaines est chose courante, par exemple sous forme de tôles dans le cadre de l'industrie automobile, et a eu pour effet de promouvoir le développement de produits de base en acier, tels que des tôles, de plus en plus adaptés à leur usage final. Dans ce contexte d'applications diverses, on a été amené à développer des tôles qui devaient répondre à des critères précis tant au niveau des opérations d'élaboration telles que l'emboutissage ou le soudage, qu'au niveau de l'aspect final obtenu après un revêtement de surface tel qu'une galvanisation. Les traitements thermiques sont actuellement une étape quasi inévitable mais coûteuse dans le cycle de fabrication d'une tôle en acier et ont pour but principal d'une part, de restaurer certaines propriétés mécaniques de la tôle que les opérations précédentes, telles que le laminage, ont altérées, et d'autre part, de préparer la surface de la tôle pour une opération future telle qu'un revêtement de protection contre la corrosion.The intensive use of steel as a constituent material in various fields is common, for example in the form of sheets in industry automobile, and had the effect of promoting the development of basic products steel, such as sheets, more and more adapted to their final use. In this context of various applications, we were led to develop sheets which were to meet specific criteria both in terms of processing operations such as stamping or welding, only at the level of the final appearance obtained after a surface coating such as galvanizing. The heat treatments are currently an almost inevitable but expensive step in the manufacturing cycle of a steel sheet and have for main objective on the one hand, to restore certain mechanical properties of the sheet than previous operations, such as rolling, have weathered, and secondly, to prepare the surface of the sheet for a future operation such as a protective coating against corrosion.
La présente invention prend place dans la catégorie des traitements thermiques faisant
intervenir un refroidissement dit "à l'eau bouillante" ou HOWAQ (hot water
quenching), c'est-à-dire impliquant l'immersion de la tôle dans de l'eau à plus de 95 % de
sa température d'ébullition exprimée en °C. Ce type de refroidissement est opéré en
continu en faisant passer la tôle dans une cuve contenant l'eau bouillante et permet
d'obtenir des tôles présentant une distribution homogène des propriétés mécaniques dans
l'ensemble de la tôle ainsi qu'une planéité satisfaisante après refroidissement.
Dans le cadre de la pratique industrielle des procédés de refroidissement du type
HOWAQ, on a cependant relevé deux éléments qui en limitent les possibilités
d'application industrielle. The present invention takes place in the category of heat treatments involving cooling called "boiling water" or HOWAQ (hot water quenching), that is to say involving the immersion of the sheet in water at more than 95% of its boiling point expressed in ° C. This type of cooling is carried out continuously by passing the sheet through a tank containing boiling water and makes it possible to obtain sheets having a homogeneous distribution of the mechanical properties throughout the sheet as well as a satisfactory flatness after cooling. .
In the context of industrial practice of HOWAQ type cooling processes, however, two elements have been noted which limit the possibilities of industrial application.
Le premier élément a trait à l'obligation de se limiter à une température de la tôle à la sortie de la cuve de refroidissement supérieure à 290 à 320 °C, sinon on constate que la tôle refroidie présente un défaut de planéité. Une température de sortie de la tôle aussi élevée exclut la mise en oeuvre du HOWAQ.The first element relates to the obligation to limit oneself to a temperature of the sheet at the cooling tank outlet greater than 290-320 ° C, otherwise it can be seen that the cooled sheet has a flatness defect. A sheet outlet temperature also high excludes the implementation of HOWAQ.
Le second élément est fondamentalement inhérent au principe même de l'échange de chaleur qui s'opère entre la tôle et l'eau bouillante et pour lequel on constate qu'on atteint rapidement une valeur maximale de la vitesse de refroidissement. Malheureusement, comme dans le cas précédent des températures de sortie de la tôle, cette valeur maximale est elle aussi fortement inférieure aux vitesses actuellement exigées par l'évolution des traitements thermiques. A titre d'exemple, la vitesse de refroidissement maximale du HOWAQ est d'environ 60 °C/s pour une tôle de 0,8 mm d'épaisseur, alors qu'on souhaiterait atteindre plus de 100 °C/s, voire 500 à 1000 °C/s pour cette gamme de produits.The second element is fundamentally inherent in the very principle of the exchange of heat that operates between the sheet and boiling water and for which we find that we reach quickly a maximum value of the cooling rate. Unfortunately, as in the previous case of the sheet outlet temperatures, this value is also significantly lower than the speeds currently required by the evolution of heat treatments. For example, the cooling rate HOWAQ maximum is around 60 ° C / s for a 0.8 mm thick sheet, so that we would like to reach more than 100 ° C / s, or even 500 to 1000 ° C / s for this range of products.
La présente invention apporte une solution aux limitations d'emploi dans le contexte du refroidissement à l'eau bouillante ou HOWAQ et, avantage économique non négligeable, sa mise en oeuvre permet d'adapter facilement une ligne industrielle HOWAQ existante pour étendre la gamme des tôles qu'on peut y traiter.The present invention provides a solution to the limitations of use in the context of boiling water cooling or HOWAQ and, significant economic advantage, its implementation makes it easy to adapt an existing HOWAQ industrial line to extend the range of sheets that can be processed there.
L'invention permet de procéder à ce qu'on appelle usuellement en technique un "full quench", c'est-à-dire d'arriver à une température de sortie de la tôle d'environ 100 °C et ce avec des vitesses de l'ordre de 500°C/s à 1000°C/s pour 0,8 mm d'épaisseur.The invention makes it possible to carry out what is usually called in technique a "full quench ", that is to say to arrive at an outlet temperature of the sheet of approximately 100 ° C. and this with speeds of the order of 500 ° C / s to 1000 ° C / s for 0.8 mm thickness.
Le but est donc de modifier les conditions d'exécution d'un refroidissement du type HOWAQ habituel de manière à pouvoir obtenir une température de sortie de la tôle plus basse et des intensités de refroidissement plus élevées, tout en conservant l'avantage d'un traitement de refroidissement en continu de la tôle qui peut être mis en oeuvre sur une installation HOWAQ existante adaptée à faible coût. L'idée de base consiste à installer un caisson de refroidissement du type "black boxes", c'est-à-dire des boítes comprenant des dispositifs, comme par exemple des gicleurs, qui projettent un fluide sous pression vers la surface de la tôle à refroidir lors du passage de ladite tôle dans la boíte en question.The goal is therefore to modify the conditions of execution of a cooling of the type HOWAQ usual in order to obtain a temperature of exit of the sheet more low and higher cooling intensities, while retaining the advantage a continuous cooling treatment of the sheet which can be implemented on an existing HOWAQ installation adapted at low cost. The basic idea is to install a cooling box of the "black boxes" type, that is to say boxes comprising devices, such as sprinklers, which project fluid under pressure towards the surface of the sheet to be cooled during the passage of said sheet in the box in question.
En vue de faciliter la compréhension de l'invention et d'en préciser les éléments importants, la description fait référence à deux figures. La figure 1 est une vue globale d'une installation de refroidissement du type HOWAQ et la figure 2 est une vue partielle relative à la partie directement concernée par la présente invention.In order to facilitate understanding of the invention and to specify its elements important, the description refers to two figures. Figure 1 is an overview of a HOWAQ type cooling installation and Figure 2 is a partial view relating to the part directly concerned by the present invention.
Dans le procédé HOWAQ classique, la tôle (1) sort d'une enceinte (2) relative au
traitement précédent de la tôle (1) sous une atmosphère particulière et est introduite via
le sas (3), comportant par exemple dans le cas exposé 2 paires de rouleaux, dans une
cuve (4) contenant l'eau bouillante (5). La tôle (1) plonge dans la cuve (4), passe sur un
système de rouleaux (6) de renvoi de fond monté sur un berceau (7) lequel est mobile
verticalement dans la cuve (4) afin de permettre la modification du temps de passage de
la tôle (1) dans l'eau (5), et finalement, la tôle (1) sort de la cuve (4) via un sas de sortie
(8) et est dirigée vers d'autres étapes (14) de son élaboration.In the classic HOWAQ process, the sheet (1) comes out of an enclosure (2) relating to the
previous treatment of the sheet (1) under a particular atmosphere and is introduced via
the airlock (3), comprising for example in the exposed
On peut dire que l'origine de la présente invention a consisté globalement à associer aux opérations classiques du HOWAQ une opération supplémentaire qui prend place au sein même de la cuve (4) au moyen d'un caisson de refroidissement distinct.It can be said that the origin of the present invention consisted overall in associating with HOWAQ classic operations an additional operation that takes place within even from the tank (4) by means of a separate cooling box.
En outre, on a aussi rapidement constaté que l'association précédente donne naissance à un nouveau procédé de refroidissement, objet de la présente invention, qui permet de traiter des tôles qui doivent sortir du refroidissement à une température très inférieure à 350 °C et ce en ayant subi un refroidissement avec une vitesse de refroidissement supérieure à 60 °C/s, apportant ainsi une solution pratique aux limitations évoquées précédemment à propos du HOWAQ classique.In addition, it was also quickly found that the previous association gave birth to a new cooling process, object of the present invention, which makes it possible to process sheets which must come out of the cooling at a temperature much lower than 350 ° C and having undergone cooling with a cooling rate higher than 60 ° C / s, thus providing a practical solution to the limitations mentioned previously about the classic HOWAQ.
En effet, des essais effectués sur une tôle de 0,8 mm d'épaisseur ont montré que le procédé de la présente invention permet de travailler avec une température de sortie de la tôle proche de 100 °C et ce avec une vitesse de refroidissement proche de 1.000 °C/s, sans impact négatif sur les caractéristiques géométriques de la tôle après refroidissement, notamment sa planéité. Indeed, tests carried out on a sheet 0.8 mm thick have shown that the process of the present invention makes it possible to work with an outlet temperature of sheet metal close to 100 ° C and this with a cooling rate close to 1,000 ° C / s, without negative impact on the geometric characteristics of the sheet after cooling, including its flatness.
Cependant, il s'est rapidement avéré lors d'essais préliminaires que l'installation d'un caisson de refroidissement distinct, contenant un fluide à une température comprise entre 20 et 100 °C, directement à la sortie de la tôle hors de l'eau contenue dans la cuve de refroidissement HOWAQ, a pour effet que du liquide plus froid s'écoule hors du caisson vers la cuve, et ce même en présence d'un sas d'entrée performant à l'entrée du caisson. Il en résulte que la distribution de température tant dans la cuve que dans le caisson en est affectée et provoque un abaissement de la température de l'eau contenue dans la, cuve HOWAQ, lequel entraíne l'apparition de défauts de planéité dans les tôles traitées.However, it quickly became apparent during preliminary tests that the installation of a separate cooling box, containing a fluid at a temperature between 20 and 100 ° C, directly at the exit of the sheet from the water contained in the tank HOWAQ cooling, causes cooler liquid to flow out of the cabinet towards the tank, even in the presence of an efficient airlock at the entrance of the box. As a result, the temperature distribution both in the tank and in the box in is affected and causes a drop in the temperature of the water in the, HOWAQ tank, which causes the appearance of flatness defects in the treated sheets.
La solution proposée consiste à disposer le caisson de refroidissement de manière à obtenir des niveaux de fluides de refroidissement identiques dans la cuve et le caisson. De par l'absence de différence de pression statique entre l'intérieur et l'extérieur du caisson de refroidissement distinct, on constate des fuites pratiquement négligeables vers la cuve HOWAQ.The proposed solution is to arrange the cooling box so that obtain identical levels of coolants in the tank and the box. Due to the lack of static pressure difference between the inside and the outside of the separate cooling box, there are practically negligible leaks to HOWAQ tank.
Le procédé de refroidissement en continu d'une tôle (1) en acier, objet de la présente invention, ladite tôle (1) étant en défilement continu et à une température comprise entre 680 °C et 850 °C, est essentiellement caractérisé en ce qu'on refroidit la tôle (1) en la faisant passer dans une cuve (4) contenant un bain d'eau (5) maintenu à une température supérieure à 95 % de sa température d'ébullition exprimée en °C, en ce qu'on applique à la tôle (1) une seconde opération de refroidissement distincte de la première et qui prend place dans la phase finale de la première, en ce qu'on utilise pour cette seconde opération de refroidissement un dispositif de refroidissement distinct (9), appelé ci-après boíte de refroidissement, en ce qu'on fait passer la tôle (1) dans la boíte de refroidissement (9), en ce qu'on construit ladite boíte de refroidissement (9) et en ce qu'on la dispose dans la cuve (4) de telle sorte que la tôle (1) entre dans ladite boíte de refroidissement (9) en un point situé sous le niveau (10) de l'eau (5) dans la cuve (4) et en ce qu'on projette un fluide vers la tôle (1) lors de son passage à l'intérieur de ladite boíte de refroidissement (9).The process of continuous cooling of a steel sheet (1), object of the present invention, said sheet (1) being in continuous travel and at a temperature between 680 ° C and 850 ° C, is essentially characterized in that the sheet metal (1) is cooled by passing through a tank (4) containing a water bath (5) maintained at a temperature greater than 95% of its boiling point expressed in ° C, as applied to the sheet (1) a second cooling operation distinct from the first and which takes place in the final phase of the first, in what we use for this second cooling operation a separate cooling device (9), hereinafter called cooling box, in that we pass the sheet (1) in the box cooling (9), in that said cooling box (9) is constructed and in that that it is placed in the tank (4) so that the sheet (1) enters said box cooling (9) at a point below the level (10) of the water (5) in the tank (4) and in that a fluid is projected towards the sheet (1) during its passage inside said cooling box (9).
Suivant une modalité préférentielle de mise en oeuvre du procédé de l'invention, on déplace verticalement la boíte de refroidissement (9) de manière à réduire à une valeur minimale la différence entre les niveaux de liquide de refroidissement respectivement (10) dans la cuve (4) et (11) dans la boíte de refroidissement (9).According to a preferred method of implementing the method of the invention, vertically moves the cooling box (9) so as to reduce to a value minimum difference between coolant levels respectively (10) in the tank (4) and (11) in the cooling box (9).
Suivant une modalité de mise en oeuvre du procédé de l'invention, on projette dans la boíte de refroidissement (9) vers la tôle (1) un fluide dont la température est comprise entre 20 et 100 °C.According to a mode of implementation of the method of the invention, one projects in the cooling box (9) towards the sheet (1) a fluid whose temperature is included between 20 and 100 ° C.
Suivant une autre modalité de mise en oeuvre du procédé de l'invention, on utilise de l'eau comme fluide projeté dans la boíte de refroidissement (9).According to another embodiment of the process of the invention, water is used as fluid sprayed into the cooling box (9).
Suivant une autre modalité préférentielle de mise en oeuvre du procédé de l'invention, on fait varier la température de la tôle (1) en acier à l'entrée de la boíte de refroidissement (9) en modifiant le temps d'immersion de ladite tôle (1) dans l'eau (5) de la cuve (4) avant qu'elle ne pénètre dans la boíte de refroidissement (9); de préférence, on modifie la longueur du chemin parcouru par ladite tôle (1) dans la cuve (4) en déplaçant verticalement le berceau (7) supportant les rouleaux (6) de renvoi de fond.According to another preferred method of implementing the method of the invention, it is varies the temperature of the steel sheet (1) at the inlet of the cooling box (9) by modifying the immersion time of said sheet (1) in the water (5) of the tank (4) before that it does not enter the cooling box (9); preferably, we modify the length of the path traveled by said sheet (1) in the tank (4) by moving vertically the cradle (7) supporting the bottom return rollers (6).
La présente invention a aussi trait à un dispositif pour la mise en oeuvre des modalités précédentes du procédé de la présente invention.The present invention also relates to a device for implementing the modalities of the process of the present invention.
Le dispositif de refroidissement pour la mise en oeuvre du procédé de refroidissement en continu d'une tôle (1) en acier en défilement continu, objet de la présente invention, comprenant une cuve (4) remplie d'eau (5) à une température supérieure à 95 % de sa température d'ébullition exprimée en °C dans laquelle la tôle (1) plonge puis remonte après passage sur des rouleaux (6) de renvoi de fond, est essentiellement caractérisé en ce qu'il comporte un moyen de refroidissement (9), appelé boíte de refroidissement, disposé sur le chemin suivi par la tôle (1) de telle sorte que celle-ci entre dans la boíte de refroidissement (9) en-dessous de la surface libre (10) de l'eau (5) dans la cuve (4).The cooling device for implementing the cooling process in continuous of a steel sheet (1) in continuous travel, object of the present invention, comprising a tank (4) filled with water (5) at a temperature above 95% of its boiling point expressed in ° C in which the sheet (1) plunges and then rises after passing over bottom return rollers (6), is essentially characterized by what it includes a cooling means (9), called cooling box, arranged on the path followed by the sheet (1) so that it enters the box cooling (9) below the free surface (10) of the water (5) in the tank (4).
Suivant une modalité de réalisation du dispositif, objet de la présente invention, la boíte de refroidissement (9) est un caisson alimenté en fluide sous pression et pourvu d'éléments pour projeter un fluide vers la tôle (1), par exemple des trous ou des gicleurs, en une densité comprise entre 400 et 2.000 éléments par m2 de surface active en projection.According to one embodiment of the device, object of the present invention, the box cooling (9) is a box supplied with pressurized fluid and provided elements for projecting a fluid towards the sheet metal (1), for example holes or nozzles, in a density of between 400 and 2,000 elements per m2 of active surface in projection.
Suivant une autre modalité de réalisation du dispositif, objet de la présente invention, la boíte de refroidissement (9) est pourvue de moyens (12) et (13) destinés tant à limiter la fuite vers la cuve (4) du fluide projeté vers la tôle (1) à l'intérieur de la boíte de refroidissement (9) que d'empêcher l'entrée de l'eau de la cuve (4) dans la boíte de refroidissement (9):According to another embodiment of the device, object of the present invention, the cooling box (9) is provided with means (12) and (13) intended both to limit the leakage towards the tank (4) of the fluid projected towards the sheet (1) inside the box cooling (9) than to prevent the entry of water from the tank (4) into the box cooling (9):
Suivant encore une autre modalité de réalisation du dispositif, objet de la présente invention, le circuit alimentant la boíte de refroidissement comporte des systèmes aptes à réguler les conditions de travail du fluide projeté, de préférence sa température.According to yet another embodiment of the device, object of the present invention, the circuit supplying the cooling box comprises systems capable to regulate the working conditions of the sprayed fluid, preferably its temperature.
Suivant une modalité de réalisation préférentielle du dispositif, objet de la présente invention, un berceau (7) supporte les rouleaux (6) de renvoi de fond et est déplaçable verticalement, permettant de la sorte de modifier le temps de passage de la tôle (1) dans la cuve (4), des sas (3) et (8) sont disposés respectivement à l'entrée et à la sortie de la tôle (1) en acier respectivement dans et hors de l'enceinte comprenant la cuve (4) afin d'isoler l'enceinte contenant la cuve (4) par rapport aux atmosphères régnant dans les enceintes respectivement (2) dont est originaire la tôle (1) et (14) vers laquelle elle se dirige après refroidissement.According to a preferred embodiment of the device, object of the present invention, a cradle (7) supports the bottom return rollers (6) and is movable vertically, allowing in this way to modify the passage time of the sheet (1) in the tank (4), airlocks (3) and (8) are disposed respectively at the inlet and at the outlet of the steel sheet (1) respectively in and out of the enclosure comprising the tank (4) so isolate the enclosure containing the tank (4) from the atmospheres prevailing in the enclosures respectively (2) from which the sheet metal (1) and (14) to which it is originating directs after cooling.
Claims (12)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9800710A BE1012215A3 (en) | 1998-10-01 | 1998-10-01 | Cooling process of continuous sheet steel and device for its implementation. |
| BE9800710 | 1998-10-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0992593A1 true EP0992593A1 (en) | 2000-04-12 |
| EP0992593B1 EP0992593B1 (en) | 2004-05-26 |
Family
ID=3891446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99870192A Expired - Lifetime EP0992593B1 (en) | 1998-10-01 | 1999-09-21 | Method and device for continuous cooling of steel sheet |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0992593B1 (en) |
| AT (1) | ATE267882T1 (en) |
| BE (1) | BE1012215A3 (en) |
| DE (1) | DE69917553T2 (en) |
| ES (1) | ES2221348T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1300478A1 (en) * | 2001-10-05 | 2003-04-09 | CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif | Process and device for accelerated cooling in a continuous annealing line |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021024021A1 (en) * | 2019-08-06 | 2021-02-11 | Arcelormittal | Device for cooling a steel strip |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU81187A1 (en) * | 1979-04-24 | 1980-12-16 | Centre Rech Metallurgique | IMPROVEMENTS IN METHODS OF HEAT TREATING METAL SHEET |
| BE887507A (en) * | 1981-02-12 | 1981-06-01 | Centre Rech Metallurgique | IMPROVEMENTS IN PROCESSES OF CONTINUOUS HEAT TREATMENT OF STEEL SHEETS |
| JPS58120747A (en) * | 1982-01-13 | 1983-07-18 | Nippon Steel Corp | Continuous heat treatment installation for cold-rolled steel strip for working and high tensile cold-rolled steel strip |
| EP0086331A1 (en) * | 1982-01-13 | 1983-08-24 | Nippon Steel Corporation | Continuous heat treating line for mild and high tensile strength stell strips or sheets |
| EP0195658A2 (en) * | 1985-03-22 | 1986-09-24 | Kawasaki Steel Corporation | Method and apparatus of cooling steel strip |
| EP0195659A2 (en) * | 1985-03-22 | 1986-09-24 | Kawasaki Steel Corporation | Method and apparatus of cooling steel strip in continuous heat treating line |
-
1998
- 1998-10-01 BE BE9800710A patent/BE1012215A3/en not_active IP Right Cessation
-
1999
- 1999-09-21 ES ES99870192T patent/ES2221348T3/en not_active Expired - Lifetime
- 1999-09-21 DE DE69917553T patent/DE69917553T2/en not_active Expired - Lifetime
- 1999-09-21 AT AT99870192T patent/ATE267882T1/en not_active IP Right Cessation
- 1999-09-21 EP EP99870192A patent/EP0992593B1/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU81187A1 (en) * | 1979-04-24 | 1980-12-16 | Centre Rech Metallurgique | IMPROVEMENTS IN METHODS OF HEAT TREATING METAL SHEET |
| BE887507A (en) * | 1981-02-12 | 1981-06-01 | Centre Rech Metallurgique | IMPROVEMENTS IN PROCESSES OF CONTINUOUS HEAT TREATMENT OF STEEL SHEETS |
| JPS58120747A (en) * | 1982-01-13 | 1983-07-18 | Nippon Steel Corp | Continuous heat treatment installation for cold-rolled steel strip for working and high tensile cold-rolled steel strip |
| EP0086331A1 (en) * | 1982-01-13 | 1983-08-24 | Nippon Steel Corporation | Continuous heat treating line for mild and high tensile strength stell strips or sheets |
| EP0195658A2 (en) * | 1985-03-22 | 1986-09-24 | Kawasaki Steel Corporation | Method and apparatus of cooling steel strip |
| EP0195659A2 (en) * | 1985-03-22 | 1986-09-24 | Kawasaki Steel Corporation | Method and apparatus of cooling steel strip in continuous heat treating line |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 007, no. 225 (C - 189) 6 October 1983 (1983-10-06) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1300478A1 (en) * | 2001-10-05 | 2003-04-09 | CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif | Process and device for accelerated cooling in a continuous annealing line |
| BE1014418A3 (en) * | 2001-10-05 | 2003-10-07 | Cockerill Rech & Dev | Method and device for accelerated cooling in continuous annealing. |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE267882T1 (en) | 2004-06-15 |
| ES2221348T3 (en) | 2004-12-16 |
| BE1012215A3 (en) | 2000-07-04 |
| DE69917553T2 (en) | 2005-06-30 |
| DE69917553D1 (en) | 2004-07-01 |
| EP0992593B1 (en) | 2004-05-26 |
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