EP1108795A1 - Process and device for preventing buckling of strip in a fast cooling zone of a heat treatment line - Google Patents

Process and device for preventing buckling of strip in a fast cooling zone of a heat treatment line Download PDF

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Publication number
EP1108795A1
EP1108795A1 EP00403318A EP00403318A EP1108795A1 EP 1108795 A1 EP1108795 A1 EP 1108795A1 EP 00403318 A EP00403318 A EP 00403318A EP 00403318 A EP00403318 A EP 00403318A EP 1108795 A1 EP1108795 A1 EP 1108795A1
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EP
European Patent Office
Prior art keywords
cooling
strip
boxes
blowing
intensity
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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
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EP00403318A
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German (de)
French (fr)
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EP1108795B1 (en
Inventor
Catherine Pasquinet
Xavier Cluzel
Akli Elias
Jérome Muller
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USINOR SA
Fives Stein SA
Original Assignee
Stein Heurtey SA
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Publication of EP1108795A1 publication Critical patent/EP1108795A1/en
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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
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material

Definitions

  • the present invention relates to improvements made to the chambers rapid cooling of strip heat treatment lines metallic.
  • it intends to reduce the formation of folds that form on metal strips subjected to cooling in continuous heat treatment lines, in which said strips are brought through cooling zones provided with means for blowing a cooling gas.
  • Figure 1 represents schematic, in perspective and partial cutaway of the cooling zone of a metal strip in a heat treatment line.
  • strip 1 crosses the cooling zone fast 2 passing on an input roller 3 and an output roller 10.
  • strip 1 is exposed to gas jets of cooling blown by a number of pairs of boxes such as 4 and 5 and 6 and 7, each provided with blowing means, each box being positioned on either side of the strip.
  • Cooling boxes such that 4 and 5 and 6 and 7 have a limited length so as to allow the installation of one or more rollers or pairs of stabilizing rollers such as rollers 8 and 9, between two consecutive boxes such as 4 and 6 and 5 and 7, respectively, these well-known rollers being intended to guide and stabilize the band 1.
  • the cooling gas is blown on the belt by all conventional means such as those described in particular in US -A-3,068,586.
  • FIG. 1A On the graph illustrated by FIG. 1A, associated with FIG. 1, there is shown the intensity ⁇ of the cooling undergone by the strip 1 during its crossing of the zone 2.
  • the intensity When entering between the first cooling boxes 4 and 5, the strip is suddenly exposed to a significant cooling flow, the intensity remains constant over the entire length of the cooling box, then this intensity decreases suddenly at the exit of said boxes.
  • This variation of the cooling intensity undergone by the strip is renewed during of its passage between each subsequent pair of cooling boxes arranged over the entire length of zone 2 as can be clearly seen on the Figure 1A.
  • the degree of cooling of the strip over the length of a box depends of the temperature of the blown cooling gas, characteristics geometry of the blowing holes of the boxes and the distance of these orifices relative to the strip.
  • FIG. 2 of the accompanying drawings there is illustrated such a type of cycle cooling for which, for example, the strip is cooled according to slopes A-B, C-D and E-F, at least one of these slopes being greater than cooling slopes characteristic of the prior art.
  • the sections B-C and D-E correspond to the discontinuities of the cooling due to interruptions in the supply air boxes for the in place stabilizing rollers such as rollers 8 and 9 shown on Figure 1.
  • the current invention set itself the objective of solving this problem by providing a solution which limits the formation of folds in the strip during rapid cooling while maintaining the nominal belt speed in its crossing of the rapid cooling zone, that is to say, without loss of production.
  • the cooling of the strip under the effect of the gas jets blown by the cooling chambers causes the web material to contract in directions parallel and perpendicular to the direction of travel Of the band.
  • the contraction in the direction of travel of the strip is compensated by the belt traction control device with which the cooling zone or the line in which this cooling zone is integrated.
  • the intensity of the strip cooling is constant and there is no difference significant between the compressive forces existing in a section of the strip and the one preceding it in the running direction of this strip.
  • the forces of compression in a section of the band may be greater than those which exist in the section which precedes it and which undergoes a cooling of less intensity. This difference is all the more important as the variation cooling slope between these two sections is large, as is the case for example at the entry or exit of a pair of cooling.
  • Figure 3 of the accompanying drawings shows the results of the modeling by calculating the thermomechanical stresses that appear in the material of the strip during the various stages of cooling of this strip operated according to the cycle illustrated in FIG. 2.
  • This figure 3 illustrates the phenomenon described above and shows the evolution temperatures along the length L of the cooling zone as well as the resulting stresses in the material.
  • Curve C1 shows the theoretical evolution of the strip during its crossing of the cooling zone
  • curve C2 shows the actual evolution of this temperature with the singularities due to the discontinuity of the related cooling construction constraints of the cooling zone
  • the curve C3 shows the evolution of the stress in the strip material over the length from the cooling zone.
  • this stress peak depends on the temperature of the strip and of the variation in the cooling slope, i.e. the variation of cooling rate at point of curve C2 or the corresponding point as the strip enters or leaves the cooling zone corresponding to a pair of cooling boxes such as 4 and 5 on the figure 1.
  • folds can take various forms, they can be continuous over the length of the strip or discontinuous, they can be parallel to the axis of the strip or meander across its width. They can be unique or develop according to the form of several continuous parallel folds, discontinuous, linear or according to a regular curve or not.
  • the present invention provides a process which is essentially characterized in that it consists in gradually modifying the intensity of cooling each time variation of the slope of the cooling cycle, so as to limit the peak of corresponding stress in the material and reduce or eliminate the forces compression perpendicular to the tape running direction, which appear here between two consecutive sections of the strip in causing folds in the latter.
  • FIG. 4A The method according to the invention is illustrated in FIG. 4A, associated with FIG. 4 which partially represents a rapid cooling zone 2 of the strip 1, according to a view similar to FIG. 1.
  • FIG. 4A shows the modifications of the cooling efficiency of the strip obtained by the implementation of the process, at the inlet and outlet of the cooling chambers 4 and 5. It is obvious to a person skilled in the art that the process which is the subject of the present invention can be used anywhere in the cooling zone where produces a cooling slope variation in the strip cooling.
  • the process which is the subject of the invention improves the quality of the finished product given that the heat treatment carried out on the material of the strip did not make it undergo a contraction likely to induce within it a constraint incompatible with its mechanical characteristics at temperature considered.
  • the method according to the invention can be implemented by any means suitable for limiting sudden variations in slope of cooling or ensuring a gradual change of cooling between the input roller 3 and the first boxes 4 and 5, between two boxes consecutive, between the outlet boxes and the roller 10, or at any point the installation where a variation in the cooling slope occurs.
  • FIGS. 5 to 10 various examples of non-limiting embodiment of means implementing the method according to the invention.
  • FIGS. 5 to 10 schematically represent the start of an area cooling 2 with its first boxes 4 and 5 between which the strip 1 to be cooled is subjected to the action of blown cooling gas jets by the blowing means provided on the boxes.
  • the boxes 4 and 5 are provided with conventional blowing means consisting of tubes or nozzles such that 11 arranged over the entire surface of the boxes facing the strip 1.
  • the boxes 4 and 5 are provided with blowing means 11, the first of which, in the direction of travel of the strip, have a distance from the blowing orifice which is more important than those located on the current length boxes to reduce their efficiency.
  • the distance between the blowing orifice and the strip can be gradually reduced to the current value over the entire length of the box so as to obtain progressive cooling of the conforming strip to the desired effect.
  • the boxes of cooling 4 and 5 are provided with blowing means 11, the first of which in the direction of advancement of the strip are arranged with a step or a larger mesh than those located on the current length of the boxes so to obtain a progressive cooling of the strip.
  • the progressiveness of the cooling efficiency of the strip can be obtained also by varying the supply pressure of the blowing orifices 11 of the boxes 4 and 5, located near a point of variation of the slope of cooling.
  • this variation the supply pressure of the blowing orifices 11 is produced using a splitting of the blowing boxes 4 and 5 so that their part respective input is supplied independently by distributors 14 and 15 at a lower pressure than the supply pressure of the others respective parts of these boxes which are supplied by distributors 16 and 17.
  • the modification of the supply pressure of the different blowing zones of the same box can be done, in a variable way, at by means outside the area, these means being controlled by the equipment control device and this at any point where the variation of the cooling intensity.
  • FIG. 9 another embodiment of the invention is shown.
  • deflectors such as 12 are provided, which are located on either side of the strip as well as on the lateral faces of the boxes 4 and 5, in the vicinity of the point where the slope of the cooling.
  • These deflectors 12 force the cooling gas from the blowing holes 11 to run parallel to the strip (arrow 13), in a direction opposite to its movement.
  • This channels the gas from cooling between the deflectors and the strip. Thanks to this arrangement the temperature of the cooling gas rises thus producing progressiveness cooling sought over the length of the deflectors 12.
  • FIG. 10 another variant of the device has been represented according to the invention intended to limit the discontinuity of cooling between two pairs of consecutive boxes 4,5 and 6,7 between which are positioned stabilizing rollers 8 and 9.
  • the blowing orifices 11 are installed on boxes 5 and 6 over the greatest possible distance so limit the length of strip not subject to cooling. Thanks to that arrangement, the desired cooling progressiveness is obtained.
  • the means which, according to the invention, make it possible to modify gradually the intensity of the cooling of the strip with each variation of the cooling slope can be installed on each zone of the caissons where this variation in slope takes place so as to obtain the progressive cooling, at the inlet or outlet of the box or in all intermediate point of this box.
  • the invention is not limited to the examples of realization described and / or represented but that it includes all the variants. This is how the present invention encompasses any device allowing to obtain a progressive cooling of the strip in all point of variation of its cooling slope.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Wire Bonding (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Control Of Heat Treatment Processes (AREA)

Abstract

Cooling of a metal band on a treatment line uses cooling zones having containers filled with a cooling gas. Each zone progressively modifies the intensity of cooling. An Independent claim is included for an apparatus for performing the above where the band passing the containers while moving between inlet and outlet rollers. A treatment zone is located between adjacent containers, between the inlet roller and the first container and the last container and the outlet roller. Preferred Features: The distance between gas outlets in the containers is variable. The distance of the outlets from the band is adjustable. The size of the orifices is adjustable.

Description

La présente invention concerne des perfectionnements apportés aux chambres de refroidissement rapide de lignes de traitement thermique de bandes métalliques. Elle se propose plus particulièrement de réduire la formation de plis qui se forment sur des bandes métalliques soumises à un refroidissement dans des lignes continues de traitement thermique, dans lesquelles lesdites bandes sont amenées à traverser des zones de refroidissement munies de moyens de soufflage d'un gaz de refroidissement.The present invention relates to improvements made to the chambers rapid cooling of strip heat treatment lines metallic. In particular, it intends to reduce the formation of folds that form on metal strips subjected to cooling in continuous heat treatment lines, in which said strips are brought through cooling zones provided with means for blowing a cooling gas.

Afin de bien situer le domaine technique auquel s'applique la présente invention, on se réfère en premier lieu à la figure 1 qui représente de façon schématique, en perspective et arrachement partiel la zone de refroidissement d'une bande métallique dans une ligne de traitement thermique.In order to properly locate the technical field to which this applies invention, we first refer to Figure 1 which represents schematic, in perspective and partial cutaway of the cooling zone of a metal strip in a heat treatment line.

Sur cette figure 1 on voit que la bande 1 traverse la zone de refroidissement rapide 2 en passant sur un rouleau d'entrée 3 et un rouleau de sortie 10. Durant la traversée de la zone 2, la bande 1 est exposée à des jets de gaz de refroidissement soufflés par un certain nombre de paires de caissons tels que 4 et 5 et 6 et 7, munis chacun de moyens de soufflage, chaque caisson étant positionné de part et d'autre de la bande. Les caissons de refroidissement tels que 4 et 5 et 6 et 7, présentent une longueur limitée de façon à permettre l'implantation d'un ou de plusieurs rouleaux ou paires de rouleaux stabilisateurs tels que les rouleaux 8 et 9, entre deux caissons consécutifs tels que 4 et 6 et 5 et 7, respectivement, ces rouleaux bien connus étant destinés à guider et à stabiliser la bande 1.In this figure 1 we see that the strip 1 crosses the cooling zone fast 2 passing on an input roller 3 and an output roller 10. Durant crossing zone 2, strip 1 is exposed to gas jets of cooling blown by a number of pairs of boxes such as 4 and 5 and 6 and 7, each provided with blowing means, each box being positioned on either side of the strip. Cooling boxes such that 4 and 5 and 6 and 7 have a limited length so as to allow the installation of one or more rollers or pairs of stabilizing rollers such as rollers 8 and 9, between two consecutive boxes such as 4 and 6 and 5 and 7, respectively, these well-known rollers being intended to guide and stabilize the band 1.

Le soufflage du gaz de refroidissement sur la bande est assuré par tous moyens classiques tels que ceux décrits notamment dans US -A-3 068 586.The cooling gas is blown on the belt by all conventional means such as those described in particular in US -A-3,068,586.

Sur le graphique illustré par la figure 1A, associée à la figure 1, on a représenté l'intensité  du refroidissement subi par la bande 1 durant sa traversée de la zone 2. Lors de son entrée entre les premiers caissons de refroidissement 4 et 5, la bande est exposée brutalement à un flux de refroidissement important dont l'intensité reste constante sur toute la longueur du caisson de refroidissement, puis cette intensité décroít brutalement à la sortie desdits caissons. Cette variation de l'intensité du refroidissement subi par la bande se renouvelle lors de son passage entre chaque paire suivante de caissons de refroidissement disposés sur toute la longueur de la zone 2 ainsi qu'on le voit clairement sur la figure 1A.On the graph illustrated by FIG. 1A, associated with FIG. 1, there is shown the intensity  of the cooling undergone by the strip 1 during its crossing of the zone 2. When entering between the first cooling boxes 4 and 5, the strip is suddenly exposed to a significant cooling flow, the intensity remains constant over the entire length of the cooling box, then this intensity decreases suddenly at the exit of said boxes. This variation of the cooling intensity undergone by the strip is renewed during of its passage between each subsequent pair of cooling boxes arranged over the entire length of zone 2 as can be clearly seen on the Figure 1A.

L'intensité du refroidissement de la bande sur la longueur d'un caisson dépend de la température du gaz de refroidissement soufflé, des caractéristiques géométriques des orifices de soufflage des caissons et de la distance de ces orifices par rapport à la bande.The degree of cooling of the strip over the length of a box depends of the temperature of the blown cooling gas, characteristics geometry of the blowing holes of the boxes and the distance of these orifices relative to the strip.

L'augmentation des performances des lignes de traitement thermique ou de revêtement de bandes s'est matérialisée par la mise en oeuvre de cycles de refroidissement rapides ou comprenant une succession de pentes de refroidissement plus ou moins rapides qui nécessitent la mise en oeuvre de débits très importants de gaz de refroidissement.Increasing the performance of heat treatment lines or strip coating materialized by the implementation of cycles of rapid cooling or comprising a succession of slopes of more or less rapid cooling which requires the implementation of very large cooling gas flows.

Sur la figure 2 des dessins annexés on a illustré un tel type de cycle de refroidissement pour lequel, par exemple, la bande est refroidie selon les pentes A-B, C-D et E-F, l'une au moins de ces pentes étant supérieure aux pentes de refroidissement caractéristiques de l'état antérieur de l'art. Sur la figure 2 les tronçons B-C et D-E correspondent aux discontinuités du refroidissement liées aux interruptions des caissons de soufflage pour la mise en place des rouleaux stabilisateurs tels que les rouleaux 8 et 9 représentés sur la figure 1.In Figure 2 of the accompanying drawings there is illustrated such a type of cycle cooling for which, for example, the strip is cooled according to slopes A-B, C-D and E-F, at least one of these slopes being greater than cooling slopes characteristic of the prior art. On the figure 2 the sections B-C and D-E correspond to the discontinuities of the cooling due to interruptions in the supply air boxes for the in place stabilizing rollers such as rollers 8 and 9 shown on Figure 1.

Cette augmentation des pentes de refroidissement a entraíné l'apparition d'un problème critique dans ce type de zone de refroidissement : la formation de plis sur la bande qui entraínent la dégradation de la qualité du produit. La présente invention s'est fixée comme objectif de résoudre ce problème en apportant une solution qui permet de limiter la formation des plis dans la bande en cours de refroidissement rapide tout en conservant la vitesse nominale de la bande dans sa traversée de la zone de refroidissement rapide, c'est-à-dire, sans perte de production.This increase in cooling slopes led to the appearance of a critical problem in this type of cooling zone: the formation of creases on the tape which cause the degradation of the quality of the product. The current invention set itself the objective of solving this problem by providing a solution which limits the formation of folds in the strip during rapid cooling while maintaining the nominal belt speed in its crossing of the rapid cooling zone, that is to say, without loss of production.

On exposera maintenant de façon détaillée le problème technique posé par les solutions selon l'état antérieur de l'art et qui est résolu par la présente invention.We will now describe in detail the technical problem posed by solutions according to the prior art and which is hereby resolved invention.

Le refroidissement de la bande sous l'effet des jets de gaz soufflés par les caissons de refroidissement provoque une contraction du matériau de la bande suivant des directions parallèles et perpendiculaires à la direction de défilement de la bande. La contraction suivant la direction de défilement de la bande est compensée par le dispositif de contrôle de traction de bande dont est munie la zone de refroidissement ou la ligne dans laquelle cette zone de refroidissement est intégrée.The cooling of the strip under the effect of the gas jets blown by the cooling chambers causes the web material to contract in directions parallel and perpendicular to the direction of travel Of the band. The contraction in the direction of travel of the strip is compensated by the belt traction control device with which the cooling zone or the line in which this cooling zone is integrated.

La contraction s'effectuant selon la direction perpendiculaire au défilement de la bande génère des forces de compression au sein du matériau qui sont dirigées vers l'axe de la bande.The contraction taking place in the direction perpendicular to the movement of the strip generates compression forces within the material which are directed towards the axis of the strip.

Sur toute la longueur du caisson de soufflage, l'intensité du flux de refroidissement de la bande est constante et il n'existe pas de différence importante entre les forces de compression existant dans une section de la bande et celle qui la précède dans la direction de défilement de cette bande.Over the entire length of the blowing box, the intensity of the strip cooling is constant and there is no difference significant between the compressive forces existing in a section of the strip and the one preceding it in the running direction of this strip.

Lors d'une variation rapide de l'intensité du refroidissement, les forces de compression dans une section de la bande peuvent être supérieures à celles qui existent dans la section qui la précède et qui subit un refroidissement de moindre intensité. Cette différence est d'autant plus importante que la variation de pente de refroidissement entre ces deux sections est grande, comme c'est le cas par exemple à l'entrée ou à la sortie d'une paire de caissons de refroidissement.When the cooling intensity changes rapidly, the forces of compression in a section of the band may be greater than those which exist in the section which precedes it and which undergoes a cooling of less intensity. This difference is all the more important as the variation cooling slope between these two sections is large, as is the case for example at the entry or exit of a pair of cooling.

Sur la figure 3 des dessins annexés on a représenté les résultats de la modélisation par le calcul des contraintes thermomécaniques qui apparaissent dans le matériau de la bande lors des différentes étapes de refroidissement de cette bande opéré suivant le cycle illustré par la figure 2.Figure 3 of the accompanying drawings shows the results of the modeling by calculating the thermomechanical stresses that appear in the material of the strip during the various stages of cooling of this strip operated according to the cycle illustrated in FIG. 2.

Cette figure 3 illustre le phénomène décrit précédemment et montre l'évolution des températures sur la longueur L de la zone de refroidissement ainsi que les contraintes résultantes dans le matériau.This figure 3 illustrates the phenomenon described above and shows the evolution temperatures along the length L of the cooling zone as well as the resulting stresses in the material.

La courbe C1 montre l'évolution théorique de la bande durant sa traversée de la zone de refroidissement, la courbe C2 montre l'évolution réelle de cette température avec les singularités dues à la discontinuité du refroidissement liée aux-contraintes de construction de la zone de refroidissement et la courbe C3 montre l'évolution de la contrainte dans le matériau de la bande sur la longueur de la zone de refroidissement.Curve C1 shows the theoretical evolution of the strip during its crossing of the cooling zone, curve C2 shows the actual evolution of this temperature with the singularities due to the discontinuity of the related cooling construction constraints of the cooling zone and the curve C3 shows the evolution of the stress in the strip material over the length from the cooling zone.

On remarquera sur la courbe C2, pour chaque variation de la pente de refroidissement, si petite soit-elle, l'apparition d'un pic de contrainte important dans le matériau. Dès que la pente de refroidissement se stabilise, la contrainte diminue, éventuellement elle s'inverse pour réapparaítre à la prochaine modification de la pente de refroidissement. On voit également que pour chaque modification de la pente de refroidissement sur C2, il apparaít un pic correspondant de contrainte sur la courbe C3.We will notice on curve C2, for each variation of the slope of cooling, however small, the appearance of a significant stress peak in the material. As soon as the cooling slope stabilizes, the stress decreases, eventually it reverses to reappear at the next modification of the cooling slope. We also see that for each modification of the cooling slope on C2, there appears a peak constraint correspondent on curve C3.

L'importance de ce pic de contrainte dépend de la température de la bande et de la variation de pente du refroidissement, c'est-à-dire de la variation de vitesse de refroidissement au point de la courbe C2 ou au point correspondant au moment où la bande pénètre ou quitte la zone de refroidissement correspondant à une paire de caissons de refroidissement tels que 4 et 5 sur la figure 1.The importance of this stress peak depends on the temperature of the strip and of the variation in the cooling slope, i.e. the variation of cooling rate at point of curve C2 or the corresponding point as the strip enters or leaves the cooling zone corresponding to a pair of cooling boxes such as 4 and 5 on the figure 1.

Les contraintes perpendiculaires à l'axe de la bande génèrent des forces de compression dont l'intensité peut créer des plis dans la bande. Ces plis peuvent prendre des formes variées, ils peuvent être continus sur la longueur de la bande ou discontinus, ils peuvent être parallèles à l'axe de la bande ou serpenter sur sa largeur. Ils peuvent être uniques ou se développer suivant la forme de plusieurs plis parallèles continus, discontinus, linéaires ou selon une courbe régulière ou non.The stresses perpendicular to the axis of the strip generate forces of compression whose intensity can create folds in the band. These folds can take various forms, they can be continuous over the length of the strip or discontinuous, they can be parallel to the axis of the strip or meander across its width. They can be unique or develop according to the form of several continuous parallel folds, discontinuous, linear or according to a regular curve or not.

Afin de résoudre le problème résultant de la formation de ces plis, la présente invention apporte un procédé qui est essentiellement caractérisé en ce qu'il consiste à modifier progressivement l'intensité du refroidissement à chaque variation de la pente du cycle de refroidissement, de façon à limiter le pic de contrainte correspondant dans le matériau et de réduire ou supprimer les forces de compression perpendiculaires à la direction de défilement de la bande, qui apparaissent en cet endroit entre deux sections consécutives de la bande en provoquant des plis dans cette dernière.In order to solve the problem resulting from the formation of these folds, the present invention provides a process which is essentially characterized in that it consists in gradually modifying the intensity of cooling each time variation of the slope of the cooling cycle, so as to limit the peak of corresponding stress in the material and reduce or eliminate the forces compression perpendicular to the tape running direction, which appear here between two consecutive sections of the strip in causing folds in the latter.

Le procédé selon l'invention est illustré par la figure 4A, associée à la figure 4 qui représente partiellement une zone de refroidissement rapide 2 de la bande 1, selon une vue similaire à la figure 1. Cette figure 4A montre les modifications de l'efficacité du refroidissement de la bande obtenues par la mise en oeuvre du procédé, en entrée et en sortie des caissons de refroidissement 4 et 5. Il est évident pour l'homme du métier que le procédé objet de la présente invention peut être mis en oeuvre en tout point de la zone de refroidissement où se produit une variation de pente de refroidissement dans le cycle de refroidissement de la bande.The method according to the invention is illustrated in FIG. 4A, associated with FIG. 4 which partially represents a rapid cooling zone 2 of the strip 1, according to a view similar to FIG. 1. This FIG. 4A shows the modifications of the cooling efficiency of the strip obtained by the implementation of the process, at the inlet and outlet of the cooling chambers 4 and 5. It is obvious to a person skilled in the art that the process which is the subject of the present invention can be used anywhere in the cooling zone where produces a cooling slope variation in the strip cooling.

Le procédé objet de l'invention améliore la qualité du produit fini étant donné que le traitement thermique effectué sur le matériau de la bande ne lui a pas fait subir une contraction susceptible d'induire en son sein une contrainte incompatible avec ses caractéristiques mécaniques à la température considérée.The process which is the subject of the invention improves the quality of the finished product given that the heat treatment carried out on the material of the strip did not make it undergo a contraction likely to induce within it a constraint incompatible with its mechanical characteristics at temperature considered.

Le procédé selon l'invention peut être mis en oeuvre par tous moyens appropriés permettant de limiter les variations brusques de pente de refroidissement ou d'assurer un changement progressif du refroidissement entre le rouleau d'entrée 3 et les premiers caissons 4 et 5, entre deux caissons consécutifs, entre les caissons de sortie et le rouleau 10, ou en tout point de l'installation où se produit une variation de la pente de refroidissement.The method according to the invention can be implemented by any means suitable for limiting sudden variations in slope of cooling or ensuring a gradual change of cooling between the input roller 3 and the first boxes 4 and 5, between two boxes consecutive, between the outlet boxes and the roller 10, or at any point the installation where a variation in the cooling slope occurs.

On a décrit ci-après en référence aux figures 5 à 10 divers exemples de réalisation, non limitatifs de moyens mettant en oeuvre le procédé selon l'invention. Ces figures représentent de façon schématique le début d'une zone de refroidissement 2 avec ses premiers caissons 4 et 5 entre lesquels la bande 1 à refroidir est soumise à l'action des jets de gaz de refroidissement soufflés par les moyens de soufflage prévus sur les caissons.We have described below with reference to FIGS. 5 to 10 various examples of non-limiting embodiment of means implementing the method according to the invention. These figures schematically represent the start of an area cooling 2 with its first boxes 4 and 5 between which the strip 1 to be cooled is subjected to the action of blown cooling gas jets by the blowing means provided on the boxes.

Dans le mode de réalisation illustré par la figure 5, les caissons 4 et 5 sont munis de moyens de soufflage classiques constitués de tubes ou de buses tels que 11 disposés sur toute la surface des caissons en regard de la bande 1. Les caissons 4 et 5 sont munis de moyens de soufflage 11 dont les premiers, dans le sens de défilement de la bande, présentent une distance orifice de soufflagebande qui est plus importante que ceux qui sont situés sur la longueur courante des caissons de façon à en réduire l'efficacité. Comme on l'a représenté sur la figure 5 la distance entre l'orifice de soufflage et la bande peut être progressivement réduite jusqu'à la valeur courante sur toute la longueur du caisson de façon à obtenir un refroidissement progressif de la bande conforme à l'effet recherché.In the embodiment illustrated in FIG. 5, the boxes 4 and 5 are provided with conventional blowing means consisting of tubes or nozzles such that 11 arranged over the entire surface of the boxes facing the strip 1. The boxes 4 and 5 are provided with blowing means 11, the first of which, in the direction of travel of the strip, have a distance from the blowing orifice which is more important than those located on the current length boxes to reduce their efficiency. As shown in the figure 5 the distance between the blowing orifice and the strip can be gradually reduced to the current value over the entire length of the box so as to obtain progressive cooling of the conforming strip to the desired effect.

Dans l'exemple de réalisation représenté sur la figure 6, les caissons de refroidissement 4 et 5 sont munis de moyens de soufflage 11, dont les premiers dans le sens d'avancement de la bande sont disposés avec un pas ou une maille plus important que ceux situés sur la longueur courante des caissons afin d'obtenir un refroidissement progressif de la bande.In the embodiment shown in Figure 6, the boxes of cooling 4 and 5 are provided with blowing means 11, the first of which in the direction of advancement of the strip are arranged with a step or a larger mesh than those located on the current length of the boxes so to obtain a progressive cooling of the strip.

La progressivité de l'efficacité du refroidissement de la bande peut être obtenue également en faisant varier la pression d'alimentation des orifices de soufflage 11 des caissons 4 et 5, situés à proximité d'un point de variation de la pente de refroidissement. Dans le mode d'exécution illustré par la figure 7, cette variation de la pression d'alimentation des orifices de soufflage 11 est réalisée à l'aide d'un fractionnement des caissons de soufflage 4 et 5 de manière que leur partie d'entrée respective soit alimentée de façon indépendante par des distributeurs 14 et 15 à une pression plus faible que la pression d'alimentation des autres parties respectives de ces caissons qui sont alimentées par des distributeurs 16 et 17.The progressiveness of the cooling efficiency of the strip can be obtained also by varying the supply pressure of the blowing orifices 11 of the boxes 4 and 5, located near a point of variation of the slope of cooling. In the embodiment illustrated in FIG. 7, this variation the supply pressure of the blowing orifices 11 is produced using a splitting of the blowing boxes 4 and 5 so that their part respective input is supplied independently by distributors 14 and 15 at a lower pressure than the supply pressure of the others respective parts of these boxes which are supplied by distributors 16 and 17.

Selon l'invention, la modification de la pression d'alimentation des différentes zones de soufflage d'un même caisson peut s'effectuer, de façon variable, à l'aide de moyens extérieurs à la zone, ces moyens étant commandés par le dispositif de contrôle de l'équipement et ceci en tout point où est réalisée la variation de l'intensité du refroidissement.According to the invention, the modification of the supply pressure of the different blowing zones of the same box can be done, in a variable way, at by means outside the area, these means being controlled by the equipment control device and this at any point where the variation of the cooling intensity.

On peut obtenir un effet technique comparable en réduisant la section des orifices de soufflage 11 sur la partie des caissons sur laquelle on recherche la progressivité du refroidissement. Une telle solution est illustrée par la figure 8 sur laquelle on voit que, pour un pas ou une maille constante, la réduction de la section des orifices de soufflage 11 est progressive dans le sens de défilement de la bande jusqu'à ce que ces orifices de soufflage atteignent la valeur nominale de l'ensemble du caisson. A comparable technical effect can be obtained by reducing the section of the blowing holes 11 on the part of the boxes on which the progressive cooling. Such a solution is illustrated in Figure 8 on which we see that, for a constant pitch or mesh, the reduction of the section of the blowing orifices 11 is progressive in the direction of travel of the strip until these blowing holes reach the value nominal rating of the entire enclosure.

Sur la figure 9 on a représenté un autre exemple de réalisation de l'invention. Dans cette variante on prévoit des déflecteurs tels que 12 qui sont implantés de part et d'autre de la bande ainsi que sur les faces latérales des caissons 4 et 5, au voisinage du point où s'effectue la modification de la pente de refroidissement. Ces déflecteurs 12 obligent le gaz de refroidissement issu des orifices de soufflage 11 à cheminer parallèlement à la bande (flèche 13), dans une direction opposée à son déplacement. On canalise ainsi le gaz de refroidissement entre les déflecteurs et la bande. Grâce à cette disposition la température du gaz de refroidissement s'élève produisant ainsi la progressivité du refroidissement recherchée sur la longueur des déflecteurs 12.In FIG. 9 another embodiment of the invention is shown. In this variant, deflectors such as 12 are provided, which are located on either side of the strip as well as on the lateral faces of the boxes 4 and 5, in the vicinity of the point where the slope of the cooling. These deflectors 12 force the cooling gas from the blowing holes 11 to run parallel to the strip (arrow 13), in a direction opposite to its movement. This channels the gas from cooling between the deflectors and the strip. Thanks to this arrangement the temperature of the cooling gas rises thus producing progressiveness cooling sought over the length of the deflectors 12.

Sur la figure 10 on a représenté encore une autre variante du dispositif selon l'invention destinée à limiter la discontinuité du refroidissement entre deux paires de caissons consécutifs 4,5 et 6,7 entre lesquels sont positionnés des rouleaux stabilisateurs 8 et 9. Dans cette variante, les orifices de soufflage 11 sont implantés sur les caissons 5 et 6 sur la plus grande distance possible afin de limiter la longueur de bande non soumise au refroidissement. Grâce à cette disposition on obtient la progressivité de refroidissement recherchée.In FIG. 10 another variant of the device has been represented according to the invention intended to limit the discontinuity of cooling between two pairs of consecutive boxes 4,5 and 6,7 between which are positioned stabilizing rollers 8 and 9. In this variant, the blowing orifices 11 are installed on boxes 5 and 6 over the greatest possible distance so limit the length of strip not subject to cooling. Thanks to that arrangement, the desired cooling progressiveness is obtained.

L'expérimentation de l'invention sur des installations industrielles a montré que l'action des différents moyens décrits ci-dessus pouvait être complétée par l'introduction d'une différence de tension entre les bords et le centre de la bande. Cette différence de tension peut être obtenue par des moyens thermiques ou mécaniques, par exemple par un profil approprié des rouleaux d'entrée 3 et de sortie 10. Cette différence de tension génère une déformation de la bande et de sa planéité permettant ainsi de limiter les effets des forces de compression apparaissant lors d'une variation de la pente de refroidissement.Experimentation with the invention on industrial installations has shown that the action of the various means described above could be supplemented by introducing a voltage difference between the edges and the center of the bandaged. This difference in voltage can be obtained by means thermal or mechanical, for example by an appropriate profile of the rollers input 3 and output 10. This voltage difference generates a deformation of the strip and of its flatness thus making it possible to limit the effects of the forces of compression occurring when the cooling slope changes.

On comprend que les moyens, qui, selon l'invention, permettent de modifier progressivement l'intensité du refroidissement de la bande à chaque variation de la pente de refroidissement, peuvent être implantés sur chaque zone des caissons où s'effectue cette variation de pente de manière à obtenir la progressivité du refroidissement, en entrée ou en sortie de caisson ou en tout point intermédiaire de ce caisson.It is understood that the means which, according to the invention, make it possible to modify gradually the intensity of the cooling of the strip with each variation of the cooling slope, can be installed on each zone of the caissons where this variation in slope takes place so as to obtain the progressive cooling, at the inlet or outlet of the box or in all intermediate point of this box.

Chacun des moyens décrits ci-dessus peut être mis en oeuvre isolément ou en combinaison.Each of the means described above can be implemented in isolation or in combination.

Il demeure bien entendu que l'invention n'est pas limitée aux exemples de réalisation décrits et/ou représentés mais qu'elle en englobe toutes les variantes. C'est ainsi que la présente invention englobe tout dispositif permettant d'obtenir une progressivité du refroidissement de la bande en tout point de variation de sa pente de refroidissement.It remains to be understood that the invention is not limited to the examples of realization described and / or represented but that it includes all the variants. This is how the present invention encompasses any device allowing to obtain a progressive cooling of the strip in all point of variation of its cooling slope.

Claims (15)

Procédé de réduction de la formation de plis sur des bandes métalliques soumises à un refroidissement dans des lignes continues de traitement thermique dans lesquelles lesdites bandes sont amenées à traverser des zones de refroidissement comportant des caissons munis de moyens de soufflage d'un gaz de refroidissement caractérisé en ce qu'il consiste à modifier progressivement l'intensité du refroidissement à chaque variation de la pente du cycle de refroidissement.Method for reducing the formation of folds on metal strips subjected to cooling in continuous processing lines thermal in which said strips are caused to pass through zones cooling comprising boxes provided with blowing means a cooling gas characterized in that it consists in modifying gradually the intensity of the cooling each time the slope of the cooling cycle. Procédé selon la revendication 1, caractérisé en ce que la modification progressive de l'intensité du refroidissement est obtenue en réglant la capacité de refroidissement à la jonction entre deux caissons de refroidissement consécutifs.Method according to claim 1, characterized in that the modification gradual cooling intensity is obtained by adjusting the capacity cooling at the junction between two cooling boxes consecutive. Procédé selon la revendication 1, caractérisé en ce que la modification progressive de l'intensité du refroidissement est obtenue en réglant la capacité de refroidissement entre le rouleau d'entrée de la zone de refroidissement et le premier caisson de refroidissement de cette dernière.Method according to claim 1, characterized in that the modification gradual cooling intensity is obtained by adjusting the capacity between the cooling zone inlet roller and the first cooling box of the latter. Procédé selon la revendication 1, caractérisé en ce que la modification progressive de l'intensité du refroidissement est obtenue en réglant la capacité de refroidissement entre le dernier caisson de refroidissement et le rouleau de sortie de la zone de refroidissement.Method according to claim 1, characterized in that the modification gradual cooling intensity is obtained by adjusting the capacity between the last cooling box and the roller leaving the cooling zone. Procédé selon la revendication 1, caractérisé en ce que l'on modifie progressivement l'intensité du refroidissement entre deux ou plusieurs zones de soufflage d'un même caisson en faisant varier la pression d'alimentation en gaz de refroidissement.Method according to claim 1, characterized in that one modifies gradually the intensity of cooling between two or more zones of blowing of the same box by varying the gas supply pressure cooling. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, qui comprend une zone de refroidissement (2) traversée par la bande (1) en passant sur un rouleau d'entrée (3) et un rouleau de sortie (10), ladite bande étant exposée à des jets de gaz de refroidissement soufflés par une pluralité de paires de caissons (4,5; 6,7), chaque caisson étant situé de part et d'autre de la bande, caractérisé en ce qu'il comporte des moyens produisant un refroidissement progressif de la bande (1) lors de chaque variation de la pente du cycle de refroidissement, ces moyens étant prévus à la jonction entre deux paires de caissons de refroidissement successifs, entre le rouleau d'entrée (3) et la première paire de caisson (4,5) de refroidissement et entre la dernière paire de caissons et le rouleau de sortie (10).Device for carrying out the method according to claim 1, which includes a cooling zone (2) crossed by the strip (1) in passing over an input roller (3) and an output roller (10), said strip being exposed to jets of cooling gas blown by a plurality of pairs of boxes (4.5; 6.7), each box being located on either side of the strip, characterized in that it comprises means producing a progressive cooling of the strip (1) during each variation of the slope of the cooling cycle, these means being provided at the junction between two pairs of successive cooling boxes, between the input roller (3) and the first pair of cooling boxes (4,5) and between the last pair of boxes and the output roller (10). Dispositif selon la revendication 6, caractérisé en ce que lesdits moyens assurent une modification de la pression d'alimentation des différentes zones de soufflage d'un même caisson, de façon variable, par des moyens extérieurs à la zone et pouvant être commandés par le dispositif de contrôle de l'équipement.Device according to claim 6, characterized in that said means change the supply pressure of the different zones blowing of the same box, in a variable manner, by external means to the area and can be controlled by the control device equipment. Dispositif selon la revendication 6, caractérisé en ce que la distance séparant la bande (1) des orifices de soufflage (11) des caissons est variable, cette variation pouvant être progressive.Device according to claim 6, characterized in that the distance separating the strip (1) from the blowing orifices (11) of the boxes is variable, this variation can be progressive. Dispositif selon la revendication 6, caractérisé en ce que l'on fait varier la distance entre les orifices de soufflage (11) des caissons, cette variation pouvant être progressive.Device according to claim 6, characterized in that the distance between the blowing orifices (11) of the boxes, this variation can be progressive. Dispositif selon la revendication 6, caractérisé en ce que l'on fait varier la dimension de la maille des orifices de soufflage (11) des caissons, cette variation pouvant être progressive.Device according to claim 6, characterized in that the dimension of the mesh of the blowing orifices (11) of the boxes, this variation may be gradual. Dispositif selon la revendication 6, caractérisé en ce que l'on ajuste les dimensions des orifices de soufflage des différentes zones d'un même caisson pour régler la capacité de refroidissement entre lesdites zones.Device according to claim 6, characterized in that the dimensions of the blowing orifices of the different zones of the same box to adjust the cooling capacity between said zones. Dispositif selon la revendication 6, caractérisé en ce qu'il comporte des déflecteurs (12) implantés de part et d'autre de la bande (1) et/ou sur les faces latérales desdits caissons du voisinage du point où s'effectue la modification de la pente de refroidissement, afin de canaliser le gaz de refroidissement entre lesdits déflecteurs et la bande pour assurer un réchauffage progressif du gaz et réduire l'efficacité du refroidissement sur la longueur desdits déflecteurs.Device according to claim 6, characterized in that it comprises deflectors (12) installed on either side of the strip (1) and / or on the faces lateral of said caissons in the vicinity of the point where the modification of the cooling slope, in order to channel the cooling gas between said deflectors and the strip to ensure progressive heating of the gas and reduce the cooling efficiency over the length of said deflectors. Dispositif selon l'une quelconque des revendications 6 à 12 caractérisé en ce qu'il comporte en outre des moyens pour créer une différence de tension entre les bords et le centre de la bande (1) générant une déformation de la bande et de sa planeité en limitant ainsi les effets des faces de compression apparaissant lors d'une variation de la pente de refroidissement.Device according to any one of Claims 6 to 12, characterized in what it further includes means for creating a voltage difference between the edges and the center of the strip (1) generating a deformation of the strip and its flatness thereby limiting the effects of the compression faces appearing when the cooling slope changes. Dispositif selon la revendication 13, caractérisé en ce que lesdits moyens sont des moyens techniques.Device according to claim 13, characterized in that said means are technical means. Dispositif selon la revendication 13, caractérisé en ce que lesdits moyens sont des moyens mécaniques, notamment un profil approprié des rouleaux d'entrée (3) et de sortie (10).Device according to claim 13, characterized in that said means are mechanical means, in particular an appropriate profile of the rollers inlet (3) and outlet (10).
EP00403318A 1999-12-17 2000-11-28 Process and device for preventing buckling of strip in a fast cooling zone of a heat treatment line Expired - Lifetime EP1108795B1 (en)

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FR9916011A FR2802552B1 (en) 1999-12-17 1999-12-17 METHOD AND APPARATUS FOR REDUCING WEB FOLDING IN A QUICK COOLING AREA OF A HEAT TREATMENT LINE
FR9916011 1999-12-17

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2876710A1 (en) * 2004-10-19 2006-04-21 Kappa Thermline Soc Par Action METHOD AND DEVICE FOR LIMITING THE VIBRATION OF STEEL OR ALUMINUM BANDS IN GAS OR AIR BLOWING COOLING ZONES
FR2897620A1 (en) * 2006-02-21 2007-08-24 Stein Heurtey Cooling and stabilization of metal strip in a continuous heat treatment line by controlling the pressure in gas blown cooling boxes to provide a given cooling curve along the cooling length
WO2015083047A1 (en) 2013-12-05 2015-06-11 Fives Stein Method and apparatus for continuous thermal treatment of a steel strip
WO2021074500A1 (en) 2019-10-14 2021-04-22 Fives Stein Rapid cooling of high yield strength sheet steel

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4593976B2 (en) * 2004-05-31 2010-12-08 株式会社神戸製鋼所 Gas jet cooling device for steel plate in continuous annealing furnace
FR2900661B1 (en) * 2006-05-02 2008-09-26 Stein Heurtey IMPROVEMENT IN THE QUICK HEATING SECTIONS OF CONTINUOUS THERMAL TREATMENT LINES.
FR2940978B1 (en) 2009-01-09 2011-11-11 Fives Stein METHOD AND COOLING SECTION OF A METAL BAND THROUGH A PROJECTION OF A LIQUID
CN102686965B (en) * 2009-12-15 2016-02-17 西门子奥钢联冶金技术有限公司 For carrying out the apparatus and method of preheating to the steel band of motion continuously
AT511034B1 (en) * 2011-02-04 2013-01-15 Andritz Tech & Asset Man Gmbh METHOD FOR CONTROLLING A PROTECTION GASATOMOS IN A PROTECTIVE GAS CHAMBER FOR TREATING A METAL STRIP
EP2826570B1 (en) * 2013-07-16 2017-02-01 Cockerill Maintenance & Ingéniérie S.A. Pre-cooling system with controlled internal adjustment
CN109414904B (en) 2016-05-10 2022-10-28 美国钢铁公司 High strength steel product and annealing process for manufacturing the same
US11560606B2 (en) 2016-05-10 2023-01-24 United States Steel Corporation Methods of producing continuously cast hot rolled high strength steel sheet products
KR102209602B1 (en) * 2018-12-07 2021-01-28 주식회사 포스코 Cooling apparatus for steel sheet
EP3966355A1 (en) 2019-05-07 2022-03-16 United States Steel Corporation Methods of producing continuously cast hot rolled high strength steel sheet products
EP3763836B1 (en) * 2019-07-11 2023-06-07 John Cockerill S.A. Cooling device for blowing gas onto a surface of a traveling strip
US20210040578A1 (en) 2019-08-07 2021-02-11 United States Steel Corporation High ductility zinc-coated steel sheet products
EP4018005A1 (en) 2019-08-19 2022-06-29 United States Steel Corporation High strength steel products and annealing processes for making the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1337313A (en) * 1962-07-04 1963-09-13 Electric Furnace Co Forced cooling device for continuous belt furnaces
EP0031012A1 (en) * 1979-10-31 1981-07-01 Kawasaki Steel Corporation Steel strip continuous annealing apparatus
US4288258A (en) * 1978-08-06 1981-09-08 Daidotokushuko Method for cooling a metal strip during the process of heat treatment
US4704167A (en) * 1985-02-21 1987-11-03 Nippon Steel Corporation Method and apparatus for cooling steel strip
EP0911418A1 (en) * 1997-03-14 1999-04-28 Nippon Steel Corporation Steel band heat-treating apparatus by gas jet stream

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE886651R (en) * 1980-12-12 1981-04-01 Centre Rech Metallurgique METHOD AND APPARATUS FOR ACCELERATED THIN STRIP COOLING
JPS58213834A (en) * 1982-06-07 1983-12-12 Daido Steel Co Ltd Cooler
JPS59107031A (en) * 1982-12-13 1984-06-21 Nippon Kokan Kk <Nkk> Cooling method of metallic strip by cooling roll
JPS63125622A (en) * 1986-11-15 1988-05-28 Kawasaki Steel Corp Method for continuous cooling of steel strip in heat treatment stage
JPH05279752A (en) * 1992-03-31 1993-10-26 Kawasaki Steel Corp Method for continuously annealing strip and apparatus therefor
JPH07150228A (en) * 1993-11-30 1995-06-13 Nippon Steel Corp Gas jet cooling method
JP3420368B2 (en) * 1995-02-03 2003-06-23 Ｊｆｅスチール株式会社 Metal strip cooling system
FR2796139B1 (en) * 1999-07-06 2001-11-09 Stein Heurtey METHOD AND DEVICE FOR SUPPRESSING THE VIBRATION OF STRIPS IN GAS BLOWING ZONES, ESPECIALLY COOLING ZONES

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1337313A (en) * 1962-07-04 1963-09-13 Electric Furnace Co Forced cooling device for continuous belt furnaces
US4288258A (en) * 1978-08-06 1981-09-08 Daidotokushuko Method for cooling a metal strip during the process of heat treatment
EP0031012A1 (en) * 1979-10-31 1981-07-01 Kawasaki Steel Corporation Steel strip continuous annealing apparatus
US4704167A (en) * 1985-02-21 1987-11-03 Nippon Steel Corporation Method and apparatus for cooling steel strip
EP0911418A1 (en) * 1997-03-14 1999-04-28 Nippon Steel Corporation Steel band heat-treating apparatus by gas jet stream

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2876710A1 (en) * 2004-10-19 2006-04-21 Kappa Thermline Soc Par Action METHOD AND DEVICE FOR LIMITING THE VIBRATION OF STEEL OR ALUMINUM BANDS IN GAS OR AIR BLOWING COOLING ZONES
US7763131B2 (en) 2004-10-19 2010-07-27 Cmi Thermline Services Method and apparatus for limiting the vibration of steel or aluminum strips in a blown-gas or -air cooling zones
FR2897620A1 (en) * 2006-02-21 2007-08-24 Stein Heurtey Cooling and stabilization of metal strip in a continuous heat treatment line by controlling the pressure in gas blown cooling boxes to provide a given cooling curve along the cooling length
WO2007096502A3 (en) * 2006-02-21 2007-11-01 Stein Heurtey Method and device for cooling and stabilizing strip in a continuous line
WO2015083047A1 (en) 2013-12-05 2015-06-11 Fives Stein Method and apparatus for continuous thermal treatment of a steel strip
US10041140B2 (en) 2013-12-05 2018-08-07 Fives Stein Method for continuous thermal treatment of a steel strip
US11193181B2 (en) 2013-12-05 2021-12-07 Fives Stein Method and apparatus for continuous thermal treatment of a steel strip
WO2021074500A1 (en) 2019-10-14 2021-04-22 Fives Stein Rapid cooling of high yield strength sheet steel

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ATE294249T1 (en) 2005-05-15
ES2158833T3 (en) 2005-12-01
DE60019708T2 (en) 2005-09-29
ES2158833T1 (en) 2001-09-16
DE60019708D1 (en) 2005-06-02
US6464808B2 (en) 2002-10-15
FR2802552B1 (en) 2002-03-29
US20020124916A1 (en) 2002-09-12
DE1108795T1 (en) 2001-12-20
CN1300859A (en) 2001-06-27
FR2802552A1 (en) 2001-06-22
JP2001200319A (en) 2001-07-24
CN1141404C (en) 2004-03-10

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