EP1334217B1 - Method and installation for dip coating of a metal strip - Google Patents

Method and installation for dip coating of a metal strip Download PDF

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Publication number
EP1334217B1
EP1334217B1 EP01993715A EP01993715A EP1334217B1 EP 1334217 B1 EP1334217 B1 EP 1334217B1 EP 01993715 A EP01993715 A EP 01993715A EP 01993715 A EP01993715 A EP 01993715A EP 1334217 B1 EP1334217 B1 EP 1334217B1
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EP
European Patent Office
Prior art keywords
compartment
metal
liquid
plant according
bath
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EP01993715A
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German (de)
French (fr)
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EP1334217A1 (en
Inventor
Didier Dauchelle
Hugues Baudin
Patrice Lucas
Laurent Gacher
Yves Prigent
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ArcelorMittal France SA
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Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • C23C2/00361—Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • C23C2/00362—Details related to seals, e.g. magnetic means
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/523—Bath level or amount

Description

La présente invention concerne un procédé et une installation de revêtement au trempé à chaud et en continu d'une bande métallique, notamment d'une bande d'acier.The present invention relates to a method and an installation for continuous hot-dip coating of a metal strip, in particular of a steel strip.

Dans de nombreuses applications industrielles, on utilise des tôles d'acier revêtues d'une couche de protection par exemple contre la corrosion et le plus souvent revêtue d'une couche de zinc.In many industrial applications, steel sheets coated with a protective layer, for example against corrosion and most often coated with a layer of zinc.

Ce type de tôles est utilisé dans diverses industries pour réaliser toute sorte de pièces et en particulier des pièces d'aspect.This type of sheet is used in various industries to make all kinds of parts and in particular appearance parts.

Pour obtenir ce genre de tôles, on utilise des installations de revêtement au trempé en continu dans lesquelles une bande d'acier est immergée dans un bain de métal fondu par exemple du zinc, qui peut contenir d'autres éléments chimiques tels que l'aluminium, le fer, et d'éventuels éléments d'addition comme par exemple le plomb, l'antimoine, etc...La température du bain dépend de la nature du métal et dans le cas du zinc la température du bain est de l'ordre de 460°C.To obtain this kind of sheets, we use coating installations continuous dipping in which a steel strip is immersed in a bath of molten metal, for example zinc, which may contain other elements chemicals such as aluminum, iron, and possible additives such as lead, antimony, etc. The temperature of the bath depends of the nature of the metal and in the case of zinc the temperature of the bath is of the order 460 ° C.

Dans le cas particulier de la galvanisation à chaud, lors du défilement de la bande d'acier dans le bain de zinc fondu, il se forme à la surface de ladite bande un alliage intermétallique Fe-Zn-Al d'une épaisseur de quelques dizaine de nanomètres.In the particular case of hot-dip galvanizing, when scrolling of the steel strip in the molten zinc bath, it forms on the surface of said strip an Fe-Zn-Al intermetallic alloy with a thickness of a few tens of nanometers.

La résistance à la corrosion des pièces ainsi revêtues est assurée par le zinc dont l'épaisseur est réalisée le plus souvent par essorage pneumatique. L'adhérence du zinc sur la bande d'acier est assurée par la couche d'alliage intermétallique cité précédemment.Corrosion resistance of the parts thus coated is ensured by zinc, the thickness of which is produced most often by pneumatic spinning. The adhesion of zinc to the steel strip is ensured by the alloy layer intermetallic cited above.

Avant le passage de la bande d'acier dans le bain de métal fondu, cette bande d'acier circule d'abord dans un four de recuit sous atmosphère réductrice en vue de la recristalliser après l'écrouissage important lié à l'opération de laminage à froid, et de préparer son état chimique de surface afin de favoriser les réactions chimiques nécessaires à l'opération de trempé proprement dite. La bande d'acier est portée aux environs de 650 à 900°C selon la nuance pendant le temps nécessaire à la recristallisation et à la préparation de surface. Elle est ensuite refroidie à une température voisine de celle du bain de métal fondu à l'aide d'échangeurs. Before the steel strip passes through the molten metal bath, this strip of steel first circulates in an annealing furnace under an atmosphere reducing in order to recrystallize it after the significant work hardening linked to the operation cold rolling, and to prepare its surface chemical state in order to favor the chemical reactions necessary for the actual quenching operation. The steel strip is brought to around 650 to 900 ° C depending on the grade during time required for recrystallization and surface preparation. Then she is cooled to a temperature close to that of the molten metal bath using exchangers.

Après son passage dans le four de recuit, la bande d'acier défile dans une gaine appelée aussi "descente de cloche" ou "trompe" sous atmosphère protectrice vis à vis de l'acier et est immergée dans le bain de métal fondu.After passing through the annealing furnace, the steel strip scrolls in a sheath also called "bell drop" or "horn" in an atmosphere protective against steel and is immersed in the molten metal bath.

La partie inférieure de la gaine est immergée dans le bain de métal pour déterminer, avec la surface dudit bain et à l'intérieur de cette gaine, un joint d'étanchéité liquide qui est traversé par la bande d'acier lors de son défilement dans ladite gaine.The lower part of the sheath is immersed in the metal bath to determine, with the surface of said bath and inside this sheath, a liquid gasket which is crossed by the steel strip as it travels in said sheath.

La bande d'acier est défléchie par un rouleau immergé dans le bain de métal et elle ressort de ce bain métal, puis traverse des moyens d'essorage servant à réguler l'épaisseur du revêtement de métal liquide sur cette bande d'acier.The steel strip is deflected by a roller immersed in the metal bath and it comes out of this metal bath, then passes through wringing means used to regulate the thickness of the coating of liquid metal on this strip steel.

Dans le cas particulier de la galvanisation à chaud, la surface du joint liquide à l'intérieur de la gaine est généralement recouverte d'oxyde de zinc, provenant de la réaction entre l'atmosphère à l'intérieur de cette gaine et le zinc du joint liquide et de mattes solides provenant de la réaction de dissolution de la bande d'acier.In the particular case of hot-dip galvanizing, the surface of the liquid seal inside the sheath is generally covered with zinc oxide, from the reaction between the atmosphere inside this sheath and the zinc liquid seal and solid mattes from the dissolution reaction of the steel strip.

Ces mattes ou autres particules, en sursaturation dans le bain de zinc ont une masse volumique inférieure à celle du zinc liquide et remontent à la surface du bain et notamment à la surface du joint liquide.These mattes or other particles, in supersaturation in the zinc have a lower density than liquid zinc and go back to the surface of the bath and in particular on the surface of the liquid seal.

Le défilement de la bande d'acier à travers la surface du joint liquide provoque l'entraínement des particules stagnantes. Ces particules entraínées par le mouvement du joint liquide lié à la vitesse de la bande d'acier ne sont pas évacuées dans le volume du bain et ressortent dans la zone d'extraction de la bande en créant des défauts d'aspect.The running of the steel strip through the surface of the liquid seal causes entrainment of stagnant particles. These entrained particles by the movement of the liquid seal linked to the speed of the steel strip are only not discharged into the volume of the bath and come out in the extraction zone of the strip, creating appearance defects.

De ce fait, la bande d'acier revêtue présente des défauts d'aspect qui sont amplifiés, voire révélés lors de l'opération d'essorage du zinc.As a result, the coated steel strip has appearance defects which are amplified or even revealed during the zinc wringing operation.

En effet, les particules intruses sont retenues par les jets d'essorage pneumatique avant d'être éjectées ou désagrégées, créant ainsi des traínées en sous épaisseur dans le zinc liquide d'une longueur de quelques millimètres à quelques centimètres.Indeed, the intruded particles are retained by the spinning jets pneumatic before being ejected or disaggregated, creating streaks under thickness in liquid zinc a few millimeters long a few centimeters.

Pour tenter d'éliminer les particules de zinc et les mattes à la surface du joint liquide, différentes solutions ont été proposées. To try to remove zinc particles and mattes from the surface liquid solutions, different solutions have been proposed.

Une première solution pour éviter ces inconvénients consiste à nettoyer la surface du joint liquide par pompage des oxydes de zinc et des mattes en provenance du bain.A first solution to avoid these drawbacks is to clean the surface of the liquid seal by pumping zinc oxides and mattes coming from the bath.

Ces opérations de pompage ne permettent de nettoyer la surface du joint liquide que de manière très locale au point de pompage et ont une efficacité et un rayon d'action très faible ce qui ne garantit pas un nettoyage complet du joint liquide traversé par la bande d'acier.These pumping operations do not allow the surface to be cleaned of the liquid seal only very locally at the pumping point and have an efficiency and a very small radius of action which does not guarantee a complete cleaning of the liquid seal crossed by the steel strip.

Une seconde solution consiste à réduire la surface du joint liquide au point de passage de la bande d'acier en disposant une plaque de tôle ou de céramique au niveau de ce joint liquide pour maintenir à l'écart de la bande une partie des particules présente à la surface et obtenir un auto-nettoyage du joint liquide par cette bande.A second solution consists in reducing the surface of the liquid seal at the point of passage of the steel strip by placing a sheet metal plate or ceramic at this liquid joint to keep away from the strip part of the particles present on the surface and obtain a self-cleaning of the liquid joint by this strip.

Cette disposition ne permet pas d'écarter la totalité des particules présentes à la surface du joint liquide et l'auto-nettoyage est d'autant plus important que la surface du joint liquide est réduite, ce qui est incompatible avec les conditions industrielles d'exploitation.This arrangement does not allow all the particles to be removed present on the surface of the liquid seal and self-cleaning is all the more important that the surface of the liquid seal is reduced, which is incompatible with industrial operating conditions.

De plus, au bout d'un temps de fonctionnement donné, le stockage des particules à l'extérieur de la plaque croít de plus en plus et des amas de particules finissent par se détacher et revenir sur la bande d'acier.In addition, after a given operating time, the storage particles on the outside of the plate grow more and more particles eventually detach and return to the steel strip.

L'ajout d'une plaque débouchant à la surface du joint liquide forme également un lieu privilégié pour piéger les poussières de zinc.The addition of a plate opening to the surface of the liquid seal also forms a privileged place to trap zinc dust.

Une autre solution consiste à ajouter un cadre à la surface du joint liquide dans la gaine et entourant la bande d'acier.Another solution is to add a frame to the surface of the liquid seal in the sheath and surrounding the steel strip.

Cette disposition ne permet pas d'éliminer en totalité les défauts liés à l'entraínement des oxydes de zinc et des mattes par le défilement de la bande d'acier.This provision does not eliminate all faults related to the training of zinc oxides and mattes by the movement of the steel strip.

En effet, les vapeurs de zinc au niveau du joint liquide vont se condenser sur les parois du cadre et au moindre remous occasionné par les vibrations ou les plis thermiques de la bande à l'immersion, les parois du cadre vont s'encrasser et ainsi devenir des zones de stockage de corps étrangers. In fact, the zinc vapors at the liquid joint will condense on the walls of the frame and at the slightest eddy caused by vibrations or the thermal folds of the immersion tape, the walls of the frame will become fouled and thus become storage areas for foreign bodies.

Cette solution ne peut donc fonctionner que quelques heures, voire quelques jour avant de devenir elle-même une source supplémentaire de défauts.This solution can therefore only work for a few hours, even a few days before becoming an additional source of defaults.

Ainsi, cette solution ne traite que partiellement le joint liquide et ne permet pas d'atteindre une densité très faible de défauts satisfaisant les exigences des clients désirant des surfaces sans défauts d'aspect.Thus, this solution only partially treats the liquid seal and does not achieve a very low density of defects satisfying the requirements customers wanting surfaces without appearance defects.

On connaít également une solution qui vise à l'obtention de la propreté du joint liquide par renouvellement du bain de métal fondu.We also know a solution that aims to obtain the cleanliness of the liquid seal by renewing the molten metal bath.

Le renouvellement est réalisé par introduction de zinc liquide pompé dans le bain au voisinage de la zone d'immersion de la bande d'acier.The renewal is carried out by the introduction of liquid zinc pumped into the bath near the immersion zone of the steel strip.

Cette solution présente de grosses difficultés de mise en oeuvre.This solution presents great difficulties of implementation.

En effet, elle nécessite un énorme débit de pompage pour assurer un effet de déversement et le zinc pompé et injecté au niveau du joint liquide contient les mattes générées dans le bain de zinc.Indeed, it requires a huge pumping rate to ensure a spill effect and the zinc pumped and injected at the liquid seal contains the mattes generated in the zinc bath.

Par ailleurs, la tuyauterie assurant le renouvellement du zinc liquide peut provoquer des rayures sur la bande d'acier avant son immersion et elle est elle-même source de défauts par accumulation de vapeurs de zinc condensées au-dessus du joint liquide.In addition, the piping ensuring the renewal of liquid zinc may cause scratches on the steel strip before immersion and it is itself a source of defects by accumulation of zinc vapors condensed above the liquid seal.

On connaít également un procédé qui est basé sur le renouvellement du zinc au niveau du joint liquide et dans lequel ce renouvellement est effectué à l'aide d'une boíte en acier inoxydable entourant la bande d'acier et débouchant à la surface du joint liquide. Une pompe aspire les particules entraínées par le déversement ainsi créé et les refoule dans le volume du bain.We also know a process that is based on renewal zinc at the liquid joint and in which this renewal is made using a stainless steel box surrounding the steel strip and opening on the surface of the liquid seal. A pump sucks entrained particles by the spill thus created and pushes them back into the volume of the bath.

Ce procédé nécessite aussi un débit de pompage très important pour maintenir un effet de déversement permanent dans la mesure où la boíte entourant la bande dans le volume du bain au-dessus du rouleau de fond ne peut être hermétiquement étanche.This process also requires a very high pumping rate to maintain a permanent spill effect as long as the box surrounding the band in the volume of the bath above the bottom roller can be hermetically sealed.

L'invention a pour but de proposer un procédé et une installation de galvanisation en continu d'une bande métallique qui permettent d'éviter les inconvénients précédemment mentionnés et d'atteindre la densité très faible des défauts satisfaisant aux exigences des clients désirant des surfaces sans défauts d'aspect. The object of the invention is to propose a method and an installation continuous galvanizing of a metal strip which prevents disadvantages previously mentioned and to achieve the very low density of defects satisfying the requirements of customers wanting flawless surfaces appearance.

L'invention a donc pour objet un procédé de revêtement au trempé en continu d'une bande métallique dans une cuve contenant un bain de métal liquide, procédé dans lequel on fait défiler en continu, sous atmosphère protectrice, la bande métallique dans une gaine dont la partie inférieure est immergée dans le bain de métal liquide pour déterminer avec la surface dudit bain et à l'intérieur de cette gaine, un joint d'étanchéité liquide, on dévie la bande métallique sur un rouleau déflecteur disposé dans le bain de métal, et on essore la bande métallique revêtue à la sortie du bain de métal, caractérisé en ce que on réalise un écoulement naturel du métal liquide, de la surface du joint liquide dans un compartiment de déversement ménagé dans ladite gaine et comportant une paroi interne prolongeant la gaine à sa partie inférieure et au moins un regard de la face de la bande située du côté du rouleau déflecteur, l'arête supérieure du compartiment étant positionnée au-dessous de ladite surface et la hauteur de chute du métal liquide dans ce compartiment étant déterminée pour empêcher la remontée des particules d'oxyde de métal et de composés intermétalliques à contre-courant de l'écoulement du métal liquide et on maintient le niveau de métal liquide dans ledit compartiment à un niveau au-dessous de la surface du joint liquide.The invention therefore relates to a dip coating process continuous metal strip in a tank containing a metal bath liquid, process in which we continuously scroll, under a protective atmosphere, the metal strip in a sheath whose lower part is immersed in the liquid metal bath to determine with the surface of said bath and inside from this sheath, a liquid seal, we deflect the metal strip on a deflector roller placed in the metal bath, and the strip is wrung metal coated at the outlet of the metal bath, characterized in that one realizes a natural flow of the liquid metal from the surface of the liquid seal in a discharge compartment formed in said sheath and comprising a wall internal extending the sheath to its lower part and at least one look of the side of the strip located on the side of the deflector roller, the upper edge of the compartment being positioned below said surface and the height of fall liquid metal in this compartment being determined to prevent the rise particles of metal oxide and intermetallic compounds to counter flow of the liquid metal flow and the metal level is maintained liquid in said compartment at a level below the seal surface liquid.

L'invention a pour objet une installation de revêtement au trempé en continu d'une bande métallique, du type comprenant :

  • une cuve contenant un bain de métal liquide,
  • une gaine de défilement de la bande métallique sous atmosphère protectrice et dont la partie inférieure est immergée dans le bain de métal liquide pour déterminer avec la surface dudit bain et à l'intérieur de cette gaine, un joint d'étanchéité liquide,
  • un rouleau déflecteur de la bande métallique disposé dans le bain de métal, et
  • des moyens d'essorage de la bande métallique revêtue à la sortie du bain de métal,
caractérisée en ce que la gaine est prolongée, à sa partie inférieure et en regard de la face la bande située du côté du rouleau déflecteur, par une paroi interne dirigée vers la surface du joint liquide dont l'arête supérieure est positionnée au-dessous de ladite surface et formant un compartiment de déversement du métal liquide, muni de moyens de maintien du niveau de métal liquide dans ledit compartiment à un niveau au-dessous de la surface du joint liquide pour réaliser un écoulement naturel du métal liquide de cette surface vers le compartiment, la hauteur de chute du métal liquide dans ce compartiment étant supérieure à 50mm pour empêcher la remontée des particules d'oxyde de métal et de composés intermétalliques à contre-courant de l'écoulement du métal liquide.The subject of the invention is a continuous dip coating installation of a metal strip, of the type comprising:
  • a tank containing a bath of liquid metal,
  • a sheath for running the metal strip under a protective atmosphere and the lower part of which is immersed in the bath of liquid metal to determine with the surface of said bath and inside this sheath, a liquid seal,
  • a metal strip deflector roller placed in the metal bath, and
  • means for wringing out the coated metal strip at the outlet from the metal bath,
characterized in that the sheath is extended, at its lower part and facing the face, the strip situated on the side of the deflection roller, by an internal wall directed towards the surface of the liquid seal, the upper edge of which is positioned below said surface and forming a liquid metal discharge compartment, provided with means for maintaining the level of liquid metal in said compartment at a level below the surface of the liquid seal to achieve a natural flow of liquid metal from this surface to the compartment, the height of fall of the liquid metal in this compartment being greater than 50 mm to prevent the rise of the particles of metal oxide and of intermetallic compounds against the current of the flow of the liquid metal.

Selon d'autres caractéristiques de l'invention :

  • la gaine est prolongée, à sa partie inférieure et en regard de la face de la bande située du côté opposé au rouleau déflecteur, par une paroi interne dirigée vers la surface du joint liquide dont l'arête supérieure est positionnée au-dessus de ladité surface et formant un compartiment étanche de stockage des particules d'oxyde de métal,
  • la hauteur de chute du métal liquide dans le compartiment de déversement est supérieure à 100mm,
  • la paroi interne de chaque compartiment présente une partie inférieure évasée vers le fond de la cuve et une partie supérieure parallèle à la bande métallique,
  • les moyens de maintien du niveau de métal liquide dans le compartiment de déversement sont formés par une pompe raccordée du côté aspiration audit compartiment par un conduit de liaison et munie du côté refoulement d'un conduit d'évacuation dans le volume du bain du métal liquide prélevé,
  • l'installation comporte des moyens de visualisation du niveau de métal liquide dans le compartiment de déversement,
  • les moyens de visualisation sont formés par un réservoir disposé à l'extérieur de la gaine et reliée à la base du compartiment de déversement par une tuyauterie du raccordement,
  • la gaine est prolongée, à sa partie inférieure et en regard de chaque bord latéral de la bande métallique, par une paroi interne dirigée vers la surface du joint liquide dont l'arête supérieure est positionnée au-dessous de ladite surface et formant un compartiment de déversement du métal liquide.
According to other characteristics of the invention:
  • the sheath is extended, at its lower part and facing the face of the strip situated on the side opposite the deflector roller, by an internal wall directed towards the surface of the liquid seal, the upper edge of which is positioned above said surface and forming a sealed compartment for storing metal oxide particles,
  • the drop height of the liquid metal in the spill compartment is greater than 100mm,
  • the internal wall of each compartment has a lower part flared towards the bottom of the tank and an upper part parallel to the metal strip,
  • the means for maintaining the level of liquid metal in the discharge compartment are formed by a pump connected on the suction side to said compartment by a connection conduit and provided on the discharge side with an evacuation conduit in the volume of the liquid metal bath taken,
  • the installation includes means for viewing the level of liquid metal in the discharge compartment,
  • the display means are formed by a reservoir placed outside the sheath and connected to the base of the discharge compartment by a connection piping,
  • the sheath is extended, at its lower part and facing each lateral edge of the metal strip, by an internal wall directed towards the surface of the liquid seal, the upper edge of which is positioned below said surface and forming a compartment for liquid metal spill.

D'autres caractéristiques et avantages de l'invention apparaítront au cours de la description qui va suivre, donnée à titre d'exemple et faite en référence aux dessins annexés, sur lesquels :

  • la Fig. 1 est une vue schématique en élévation d'une installation de revêtement au trempé en continu, conforme à l'invention,
  • la Fig. 2 est une vue en coupe de la gaine selon la ligne 2-2 de la Fig. 1,
  • la Fig. 3 est une vue schématique en élévation d'un premier mode de réalisation de l'arête supérieure du compartiment de déversement de l'installation conforme à l'invention,
  • la Fig. 4 est une vue schématique en élévation d'un second mode de réalisation de l'arête supérieure du compartiment de déversement de l'installation conforme à l'invention,
  • la Fig. 5 est une vue schématique en coupe transversale d'une variante de la gaine de l'installation conforme à l'invention.
Other characteristics and advantages of the invention will appear during the description which follows, given by way of example and made with reference to the accompanying drawings, in which:
  • Fig. 1 is a diagrammatic elevation view of a continuous dip coating installation according to the invention,
  • Fig. 2 is a sectional view of the sheath along line 2-2 of FIG. 1
  • Fig. 3 is a schematic elevation view of a first embodiment of the upper edge of the discharge compartment of the installation according to the invention,
  • Fig. 4 is a schematic elevation view of a second embodiment of the upper edge of the discharge compartment of the installation according to the invention,
  • Fig. 5 is a schematic cross-sectional view of a variant of the sheath of the installation according to the invention.

Dans ce qui suit, la description sera faite pour un procédé et une installation de galvanisation en continu d'une bande métallique. Mais, l'invention s'applique à tout procédé de trempage en continu dans lequel apparaít une pollution de surface et pour lequel il faut garder un joint liquide propre.In the following, the description will be made for a method and a installation of continuous galvanizing of a metal strip. But, the invention applies to any continuous soaking process in which pollution appears surface and for which a clean liquid seal must be kept.

Tout d'abord, à la sortie du train de laminage à froid, la bande d'acier 1 passe dans un four de recuit, non représenté, sous atmosphère réductrice en vue de la recristalliser après l'écrouissage important lié au laminage à froid, et de préparer son état chimique de surface afin de favoriser les réactions chimiques nécessaires à l'opération de galvanisation.First, at the exit of the cold rolling train, the strip of steel 1 passes through an annealing furnace, not shown, under a reducing atmosphere with a view to recrystallizing it after the significant work hardening linked to rolling at cold, and to prepare its surface chemical state in order to favor the reactions necessary for the galvanizing operation.

Dans ce four, la bande d'acier est portée à une température comprise par exemple entre 650 et 900°C.In this oven, the steel strip is brought to a temperature for example between 650 and 900 ° C.

A la sortie du four de recuit, la bande d'acier 1 passe dans une installation de galvanisation représentée à la Fig. 1 et désignée par la référence générale 10.At the outlet of the annealing furnace, the steel strip 1 passes through a galvanizing installation shown in Fig. 1 and designated by the reference general 10.

Cette installation 10 comporte une cuve 11 contenant un bain 12 de zinc liquide qui contient des éléments chimiques tels que l'aluminium, le fer et d'éventuels éléments d'addition comme le plomb, l'antimoine, notamment. This installation 10 comprises a tank 11 containing a bath 12 liquid zinc which contains chemicals such as aluminum, iron and possible additives such as lead, antimony, in particular.

La température de ce bain de zinc liquide est de l'ordre de 460°C.The temperature of this liquid zinc bath is of the order of 460 ° C.

A la sortie du four de recuit, la bande d'acier 1 est refroidie à une température voisine de celle du bain de zinc liquide à l'aide d'échangeurs et est ensuite immergée dans le bain 12 de zinc liquide.At the outlet of the annealing furnace, the steel strip 1 is cooled to a temperature close to that of the liquid zinc bath using exchangers and is then immersed in the bath 12 of liquid zinc.

Lors de cette immersion, il se forme à la surface de la bande d'acier 1 un alliage intermétallique Fe-Zn-Al permettant d'assurer la liaison entre la bande d'acier et le zinc restant sur ladite bande d'acier 1 après essorage.During this immersion, it forms on the surface of the strip of steel 1 an intermetallic alloy Fe-Zn-Al to ensure the connection between the steel strip and the zinc remaining on said steel strip 1 after wringing.

Ainsi que représenté à la Fig. 1, l'installation de galvanisation 10 comporte une gaine 13 à l'intérieur de laquelle défile la bande d'acier 1 sous atmosphère protectrice vis à vis de l'acier.As shown in FIG. 1, the galvanizing installation 10 comprises a sheath 13 inside which the steel strip 1 travels under an atmosphere protective with respect to steel.

Cette gaine 13 aussi appelée "descente de cloche" ou "trompe" présente, dans l'exemple de réalisation représenté sur les figures, une section transversale rectangulaire.This sheath 13 also called "bell descent" or "trompe" presents, in the embodiment shown in the figures, a rectangular cross section.

La partie inférieure 13a de la gaine 13 est immergée dans le bain de zinc 12 de façon à déterminer avec la surface dudit bain 12 et à l'intérieur de cette gaine 13, un joint d'étanchéité liquide 14.The lower part 13a of the sheath 13 is immersed in the bath of zinc 12 so as to determine with the surface of said bath 12 and within this sheath 13, a liquid seal 14.

Ainsi, la bande d'acier 1 à l'immersion dans le bain de zinc 12 liquide, traverse la surface du joint liquide 14 dans la partie inférieure 13a de la gaine 13.Thus, the steel strip 1 when immersed in the zinc bath 12 liquid, crosses the surface of the liquid seal 14 in the lower part 13a of the sheath 13.

La bande d'acier 1 est défléchie par un rouleau 15 couramment appelé rouleau de fond et disposé dans le bain de zinc 12. A la sortie de ce bain de zinc 12, la bande d'acier 1 revêtue passe dans des moyens d'essorage 16 qui sont par exemple constitués par des buses 16a de projection d'air et qui sont dirigées vers chaque face de la bande d'acier 1 pour réguler l'épaisseur du revêtement de zinc liquide.The steel strip 1 is deflected by a roller 15 commonly called bottom roller and placed in the zinc bath 12. At the end of this bath of zinc 12, the coated steel strip 1 passes through wringing means 16 which are for example constituted by nozzles 16a for air projection and which are directed towards each side of the steel strip 1 to regulate the thickness of the coating liquid zinc.

Ainsi que représenté sur les Figs. 1 et 2, la partie inférieure 13a de la gaine 13 est prolongée, sur le côté en regard de la face de la bande 1 située du côté du rouleau déflecteur 15, par une paroi interne 20 dirigée vers la surface du joint liquide 14 et qui ménage avec ladite partie inférieure 13a de la gaine 13, un compartiment 25 de déversement du zinc liquide, comme on le verra ultérieurement. As shown in Figs. 1 and 2, the lower part 13a of the sheath 13 is extended, on the side opposite the face of the strip 1 located on the side of the deflection roller 15, by an internal wall 20 directed towards the surface of the liquid seal 14 and which cleans with said lower part 13a of the sheath 13, a compartment 25 for discharging the liquid zinc, as will be seen later.

L'arête supérieure 21 de la paroi interne 20 est positionnée au-dessous de la surface du joint liquide 14 et le compartiment 25 est muni de moyens de maintien du niveau de zinc liquide dans ledit compartiment à un niveau au-dessous de la surface du joint liquide 14 pour réaliser un écoulement naturel de zinc liquide de cette surface dudit joint liquide 14 vers ce compartiment 25.The upper edge 21 of the internal wall 20 is positioned below of the surface of the liquid seal 14 and the compartment 25 is provided with means for maintaining the level of liquid zinc in said compartment at a level below the surface of the liquid seal 14 to produce a flow natural liquid zinc from this surface of said liquid seal 14 towards this compartment 25.

Par ailleurs, la partie inférieure 13a de la gaine 13 située en regard de la face de la bande 1 placée à l'opposé du rouleau déflecteur 15, est prolongée par une paroi interne 26 dirigée vers la surface du joint liquide 14 et ménageant avec ladite partie inférieure 13a un compartiment 29 étanche de stockage des particules, en particulier des particules d'oxyde de zinc.Furthermore, the lower part 13a of the sheath 13 located opposite of the face of the strip 1 placed opposite the deflector roller 15, is extended by an internal wall 26 directed towards the surface of the liquid seal 14 and providing with said lower part 13a a sealed storage compartment 29 particles, in particular zinc oxide particles.

L'arête supérieure 27 de la paroi interne 26 est positionnée au-dessus de la surface du joint liquide 14.The upper edge 27 of the internal wall 26 is positioned above of the surface of the liquid seal 14.

La hauteur de chute du métal liquide dans le compartiment de déversement 25 est déterminée pour empêcher la remontée des particules d'oxyde de métal et de composés intermétalliques à contre-courant de l'écoulement du métal liquide et cette hauteur est supérieure à 50mm et de préférence à 100mmThe drop height of the liquid metal in the compartment spill 25 is determined to prevent the rise of particles of metal oxide and intermetallic compounds against the flow liquid metal and this height is greater than 50mm and preferably 100mm

De préférence, les parois internes 20 et 26 présentent une partie inférieure évasée vers le fond de la cuve 11. Les parois internes 20 et 26 des compartiments 25 et 29 sont en acier inoxydable et ont une épaisseur comprise par exemple entre 10 et 20mm.Preferably, the internal walls 20 and 26 have a part lower flared towards the bottom of the tank 11. The internal walls 20 and 26 of the compartments 25 and 29 are made of stainless steel and have a thickness included for example between 10 and 20mm.

Selon un premier mode de réalisation représenté à la Fig. 3, l'arête supérieure 21 de la paroi interne 20 est rectiligne et de préférence effilée.According to a first embodiment shown in FIG. 3 the upper edge 21 of the internal wall 20 is straight and preferably tapered.

Selon un second mode de réalisation représenté à la Fig. 4, l'arête supérieure 21 de la paroi interne 20 du compartiment de déversement 25 comporte, dans le sens longitudinal, une succession de creux 22 et de saillies 23.According to a second embodiment shown in FIG. 4 the upper edge 21 of the internal wall 20 of the discharge compartment 25 comprises, in the longitudinal direction, a succession of hollows 22 and projections 23.

Les creux 22 et les saillies 23 ont la forme d'arcs de cercle et l'amplitude "a" entre lesdits creux et lesdites saillies est comprise de préférence entre 5 et 10mm. The recesses 22 and the projections 23 have the shape of arcs of a circle and the amplitude "a" between said recesses and said projections is preferably comprised between 5 and 10mm.

De plus, la distance "d" entre les creux 22 et les saillies 23 est par exemple de l'ordre de 150mm.In addition, the distance "d" between the recesses 22 and the projections 23 is for example of the order of 150mm.

Dans ce mode de réalisation également, l'arête supérieure 21 de la paroi interne 20 est de préférence effilée.In this embodiment also, the upper edge 21 of the internal wall 20 is preferably tapered.

Les moyens de maintien du niveau de zinc liquide dans le compartiment de déversement 25 sont formés par une pompe 30 raccordée du côté aspiration audit compartiment 25 par un conduit de liaison 31 et munie du côté de refoulement d'un conduit d'évacuation 32 dans le volume du bain 12 du zinc prélevé.The means of maintaining the level of liquid zinc in the discharge compartment 25 are formed by a pump 30 connected to the suction side to said compartment 25 by a connecting duct 31 and provided with discharge side of an evacuation duct 32 in the volume of the bath 12 of the zinc removed.

Par ailleurs, l'installation comporte aussi des moyens de visualisation du niveau de zinc liquide dans le compartiment de déversement 25 ou tout autre moyen permettant de visualiser le niveau du zinc liquide.Furthermore, the installation also includes display means the level of liquid zinc in the spill compartment 25 or all another way to view the level of liquid zinc.

Dans un mode de réalisation préférentiel ces moyens de visualisation sont formés par un réservoir 35 disposé à l'extérieur de la gaine 13 et relié à la base du compartiment de déversement 25 par une tuyauterie de raccordement 36.In a preferred embodiment, these display means are formed by a reservoir 35 disposed outside the sheath 13 and connected at the base of the discharge compartment 25 by a connecting pipe 36.

Comme représenté à la Fig. 1, le point de raccordement de la pompe 30 sur le compartiment de déversement 25 est situé au-dessus du point de raccordement du réservoir 35 sur ledit compartiment 25.As shown in Fig. 1, the connection point of the pump 30 on the discharge compartment 25 is located above the point connecting the reservoir 35 to said compartment 25.

L'ajout du réservoir externe 35 permet de reporter le niveau du compartiment de déversement 25 à l'extérieur de la partie inférieure 13a de la gaine 13 dans un environnement plus propice de façon à détecter facilement ce niveau. A cet effet, le réservoir 35 peut être équipé d'un détecteur de niveau de zinc liquide, comme par exemple un contacteur alimentant un voyant, un radar ou un faisceau laser.The addition of the external reservoir 35 enables the level of the spill compartment 25 outside the lower part 13a of the sheath 13 in a more favorable environment so as to easily detect this level. For this purpose, the reservoir 35 can be equipped with a level detector of liquid zinc, such as a contactor supplying a warning light, a radar or a laser beam.

Selon une variante représentée à la Fig. 5, la gaine 13 est prolongée à sa partie inférieure et en regard de chaque bord latéral de la bande d'acier 1, par une paroi interne 40 dirigée vers la surface du joint liquide 14 et dont l'arête supérieure 41 est positionnée au-dessous de ladite surface du joint liquide 14.According to a variant shown in FIG. 5, the sheath 13 is extended at its lower part and opposite each lateral edge of the strip of steel 1, by an internal wall 40 directed towards the surface of the liquid seal 14 and the upper edge 41 of which is positioned below the said joint surface liquid 14.

Chaque paroi interne 41 ménage, avec la partie inférieure de la gaine 13, un compartiment de déversement 42 du zinc liquide. Each internal wall 41 household, with the lower part of the sheath 13, a pouring compartment 42 for liquid zinc.

D'une manière générale, la bande d'acier 1 pénètre dans le bain de zinc 12 par l'intermédiaire de la gaine 13 et du joint liquide 14 et cette bande entraíne des oxydes de zinc et les mattes en provenance du bain en créant ainsi des défauts d'aspect dans le revêtement.In general, the steel strip 1 enters the bath zinc 12 through the sheath 13 and the liquid seal 14 and this strip causes zinc oxides and mattes from the bath creating appearance defects in the coating.

Pour éviter cet inconvénient, la surface du joint liquide 14 est réduite grâce aux parois internes 20 et 26 et la surface du joint liquide 14 isolée entre lesdites parois 20 et 26 s'écoule dans le compartiment de déversement 25 en passant au-dessus de l'arête supérieure 21 de la paroi interne 20 dudit compartiment 25.To avoid this drawback, the surface of the liquid seal 14 is reduced thanks to the internal walls 20 and 26 and the insulated liquid seal surface 14 between said walls 20 and 26 flows into the discharge compartment 25 passing over the upper edge 21 of the internal wall 20 of said compartment 25.

Les particules d'oxyde et les mattes ou autres particules qui surnagent à la surface du joint liquide 14 et qui sont à l'origine des défauts d'aspect, sont entraínées dans le compartiment de déversement 25 et le zinc liquide contenu dans ce compartiment 25 est pompé afin de maintenir un niveau suffisant en contre-bas pour permettre l'écoulement naturel du zinc de la surface du joint liquide 14 vers ce compartiment 25.Oxide particles and mattes or other particles which float on the surface of the liquid seal 14 and which are the source of appearance defects, are entrained in the spill compartment 25 and the liquid zinc contained in this compartment 25 is pumped in order to maintain a sufficient level below to allow the natural flow of zinc from the surface of the liquid seal 14 towards this compartment 25.

De cette manière, la surface libre du joint liquide 14 isolée entre les deux parois 20 et 26 est renouvelée en permanence et le zinc liquide aspiré par la pompe 30 dans le compartiment 25 est injecté dans le bain de zinc 12 à l'arrière de la cuve 11 par le conduit d'évacuation 32.In this way, the free surface of the isolated liquid seal 14 between the two walls 20 and 26 are constantly renewed and the liquid zinc sucked by the pump 30 in the compartment 25 is injected into the zinc bath 12 to the rear of the tank 11 via the evacuation duct 32.

Par l'effet ainsi créé, la bande d'acier 1 à l'immersion défile à travers la surface du joint liquide 14 nettoyée en permanence et ressort du bain de zinc 12 avec un minimum de défauts.By the effect thus created, the steel strip 1 at immersion scrolls through the surface of the liquid seal 14 constantly cleaned and comes out of the zinc 12 with a minimum of defects.

Le compartiment étanche 29 sert de réceptacle des oxydes de zinc ou autres particules pouvant provenir de la paroi inférieure inclinée de la gaine et permet de stocker ces oxydes afin de protéger la bande d'acier 1.The sealed compartment 29 serves as a receptacle for the oxides of zinc or other particles that may come from the inclined bottom wall of the sheath and allows these oxides to be stored in order to protect the steel strip 1.

Le réservoir externe 35 permet de détecter le niveau de zinc liquide dans le compartiment de déversement 25 et d'ajuster ce niveau de manière à le maintenir au-dessous du niveau du bain 12 en agissant par exemple sur l'introduction de lingots de zinc dans la cuve 11.The external reservoir 35 makes it possible to detect the level of liquid zinc in the spill compartment 25 and adjust this level so to keep it below the level of the bath 12 by acting for example on the introduction of zinc ingots into the tank 11.

Dans le cas où l'installation comporte en plus du compartiment de déversement 25, deux compartiments de déversement latéraux 42, l'efficacité de l'installation est sensiblement augmentée. In case the installation includes in addition to the compartment 25, two side 42 compartments, efficiency of the installation is significantly increased.

Grâce à l'installation selon l'invention, la densité de défauts sur les surfaces revêtues de la bande d'acier est considérablement réduite et la qualité d'aspect ainsi obtenue de ce revêtement convient aux critères exigés par des clients désirant des pièces dont les surfaces sont sans défauts d'aspect.Thanks to the installation according to the invention, the density of defects on the coated surfaces of the steel strip is considerably reduced and the quality appearance thus obtained from this coating is suitable for the criteria required by customers wanting parts whose surfaces have no appearance defects.

L'invention s'applique à tout revêtement métallique par trempé.The invention applies to any metallic coating by dipping.

Claims (19)

  1. Method for continuous dipped coating of a metal strip (1) in a tank (11) containing a liquid metal bath, a process in which the metal strip (1) is made to pass continuously, in a protective atmosphere, into a sheath (13), the lower part (13a) of which is immersed in the liquid metal bath (12) to determine with the surface of the said bath and inside this sheath (13), a liquid seal (14), the metal strip (1) is deflected onto a deflecting roller arranged in the metal bath (12) and the coated metal strip (1) is dried at the outlet from the metal bath (12), characterised in that a natural flow of the liquid metal is achieved from the surface of the liquid seal (14) into a discharge compartment (25) arranged in the said sheath (13) and comprising an inner wall extending the sheath (13) at its lower part and at least opposite the face of the strip (1) located on the side of the deflecting roller (15), the upper edge (21) of the compartment (25) being positioned under the said surface and the height of the drop of the liquid metal into this compartment (25) being determined so as to prevent rising of the metal oxide particles and intermetallic compounds going against the flow of the liquid metal, and the liquid metal level in the said compartment (25) is kept at a level below the surface of the liquid seal (14).
  2. Plant for continuous dipped coating of a metal strip (1), of the type comprising:
    a tank (11) containing a liquid metal bath (12),
    a sheath (13) for the metal strip (1) to pass through in a protective atmosphere, the lower part of which (13a) is immersed in the liquid bath (12) to determine, with the surface of the said bath (12) and inside this sheath (13), a liquid seal (14),
    a roller (15) for deflecting the metal strip (1), arranged in the metal bath (12), and
    means of drying the coated metal strip (1) when it emerges from the metal bath (12),
    characterised in that the sheath (13) is extended, at its lower part (13a) and opposite the face of the strip (1) located on the side of the deflecting roller (15), by an inside wall (20) directed towards the surface of the liquid seal (14), the top edge (21) of which is positioned below the said surface and forming a liquid metal discharge compartment (25), complete with means (30) for keeping the liquid metal level in the said compartment (25) at a level below the surface of the liquid seal (14) in order to produce a natural flow of the liquid metal of this surface towards this compartment (25), the height of the drop of the liquid metal in this compartment being over 50 mm to prevent the rise of metal oxide particles and intermetallic compounds going against the flow of the liquid metal.
  3. Plant according to Claim 2, characterised in that the sheath (13) is extended, at its lower part (13a) and opposite the face of the strip (1) located on the side opposite to the deflecting roller (15), by an inner wall (26) directed towards the surface of the liquid seal (14), the top edge (27) of which is positioned below the said surface and forming a sealed compartment (29) for storing metal oxide particles.
  4. Plant according to Claim 1 or 2, characterised in that the inner wall (20; 26) of each compartment (25; 29) has a lower part flared towards the bottom of the tank (11) and an upper part parallel to the metal strip (1).
  5. Plant according to Claim 2 or 4, characterised in that the height of drop of the liquid metal into the discharge compartment (25) is over 100 mm.
  6. Plant according to Claim 2 or 4, characterised in that the top edge (21) of the inner wall (20) of the discharge compartment (25) is rectilinear.
  7. Plant according to Claim 2 or 4, characterised in that the top edge (21) of the inner wall (20) of the discharge compartment (25) comprises, in the longitudinal direction, a series of depressions (22) and projections (23).
  8. Plant according to Claim 7, characterised in that the depressions (22) and projections (23) are shaped like arcs of a circle.
  9. Plant according to Claim 7 or 8, characterised in that the amplitude between the depressions (22) and the projections (23) is between 5 and 10 mm.
  10. Plant according to Claim 7 or 8, characterised in that the distance between the depressions (22) and the projections (23) is in the region of 150 mm.
  11. Plant according to Claim 6 or 7, characterised in that the top edge (21) of the inner wall (20) of the discharge compartment (25) is tapered.
  12. Plant according to any one of the previous claims, characterised in that the inner wall (20; 26) of each compartment (25; 29) is made from stainless steel and is, for example, between 10 and 20 mm thick.
  13. Plant according to Claim 2, characterised in that the means of holding the level of liquid metal in the discharge compartment (25) are in the form of a pump (30) connected on the suction side to the said compartment (25) by a linking line (31) on the discharge side of a line (32) for clearing away the metal taken up in the space of the bath (12).
  14. Plant according to any one of the previous claims, characterised in that it has means (35) of visually showing the level of liquid metal in the discharge compartment (25).
  15. Plant according to Claim 14, characterised in that the means of display are formed by a reservoir (35) arranged on the outside of the sheath (13) and connected to the base of the discharge compartment (25) by connection piping (36).
  16. Plant according to Claims 13 and 15, characterised in that the point for connecting the pump (30) onto the discharge compartment (25) is located above the point for connecting the reservoir (35) to the said compartment (25).
  17. Plant according to Claim 15, characterised in that the reservoir (35) forms a liquid metal buffer volume for the discharge compartment (25).
  18. Plant according to Claim 15, characterised in that the reservoir (35) is fitted with a liquid metal level detector.
  19. Plant according to any one of the above claims, characterised in that the sheath (13) is extended, at the lower part of it (13a) and opposite each lateral edge of the metal strip (1), by an inner wall (40) directed towards the surface of the liquid seal (14), the top edge of which (41) is positioned below the said surface and forming a liquid metal discharge compartment (42).
EP01993715A 2000-11-10 2001-11-07 Method and installation for dip coating of a metal strip Expired - Lifetime EP1334217B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0014480A FR2816639B1 (en) 2000-11-10 2000-11-10 INSTALLATION FOR THE TEMPER COATING OF A METAL STRIP
FR0014480 2000-11-10
PCT/FR2001/003455 WO2002038824A1 (en) 2000-11-10 2001-11-07 Method and installation for dip coating of a metal strip

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EP1334217A1 EP1334217A1 (en) 2003-08-13
EP1334217B1 true EP1334217B1 (en) 2004-06-16

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EP01993715A Expired - Lifetime EP1334217B1 (en) 2000-11-10 2001-11-07 Method and installation for dip coating of a metal strip

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EP (1) EP1334217B1 (en)
JP (1) JP3747199B2 (en)
KR (1) KR100725557B1 (en)
CN (1) CN1271234C (en)
AR (1) AR034274A1 (en)
AT (1) ATE269427T1 (en)
AU (2) AU2002223777B2 (en)
BG (1) BG64800B1 (en)
BR (1) BR0100006B1 (en)
CA (1) CA2428487C (en)
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DE (1) DE60103925T2 (en)
DK (1) DK1334217T3 (en)
EA (1) EA004448B1 (en)
EC (1) ECSP034594A (en)
EE (1) EE04644B1 (en)
ES (1) ES2223956T3 (en)
FR (1) FR2816639B1 (en)
HR (1) HRP20030370B1 (en)
HU (1) HU226624B1 (en)
MA (1) MA25923A1 (en)
ME (1) ME00792B (en)
MX (1) MXPA03004133A (en)
NO (1) NO20032089L (en)
PL (1) PL201517B1 (en)
PT (1) PT1334217E (en)
RS (2) RS50049B (en)
SK (1) SK286793B6 (en)
TR (1) TR200401449T4 (en)
TW (1) TW554073B (en)
UA (1) UA73220C2 (en)
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CA2479031C (en) * 2002-09-13 2008-06-03 Jfe Steel Corporation Method and apparatus for producing hot-dip plated metal strip
WO2004076707A1 (en) * 2003-02-27 2004-09-10 Sms Demag Aktiengesellschaft Method and device for melt dip coating metal strips, especially steel strips
DE102006050681B3 (en) * 2006-10-24 2007-12-27 Gea Energietechnik Gmbh Production of a heat exchanger for cooling steam in a power station comprises hot dip refining a steel sheet forming a corrosion protection layer, removing the protection layer from one side of the sheet and further processing
KR101459360B1 (en) * 2012-12-18 2014-11-20 포스코강판 주식회사 Apparatus for preventing platingless of plated strip
DE102013101131A1 (en) * 2013-02-05 2014-08-07 Thyssenkrupp Steel Europe Ag Apparatus for hot dip coating of metal strip
CN104562088A (en) * 2015-01-20 2015-04-29 郑州经纬科技实业有限公司 Electrolytic aluminum cathode conductive rod and preparation method thereof
WO2017187226A1 (en) * 2016-04-26 2017-11-02 Arcelormittal Apparatus for the continuous hot dip coating of a metal strip and associated method
CN107447174A (en) * 2016-05-31 2017-12-08 宝钢新日铁汽车板有限公司 Cleaning systems and method in a kind of stove nose
CN107794478B (en) * 2017-11-13 2019-10-29 北京首钢冷轧薄板有限公司 One kind being applied to hot galvanizing furnace nose inside liquid level cleaning device
WO2019175623A1 (en) 2018-03-12 2019-09-19 Arcelormittal Method for dip-coating a metal strip
WO2019224584A1 (en) 2018-05-25 2019-11-28 Arcelormittal Method for dip-coating a metal strip
CN108624832A (en) * 2018-07-10 2018-10-09 河北首燕机械股份有限公司 Inhibit and remove zinc gray device in hot galvanizing furnace nose
DE102019206609A1 (en) * 2019-05-08 2020-11-12 Severstal Method and device for rinsing an overflow chamber at the bath-side end of a trunk of a device for hot-dip coating
WO2021048593A1 (en) * 2019-09-10 2021-03-18 Arcelormittal Moveable overflow for continuous hot-dip coating equipments
CN111705282B (en) * 2020-06-24 2022-04-08 浙江东南新材科技有限公司 Production process of high-strength galvanized steel coil
EP4215637A1 (en) 2022-01-25 2023-07-26 John Cockerill S.A. Device for cleaning a snout in a hot-dip galvanization installation

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US4759807A (en) * 1986-12-29 1988-07-26 Rasmet Ky Method for producing non-aging hot-dip galvanized steel strip
JPH0211742A (en) * 1988-06-29 1990-01-16 Kawasaki Steel Corp Device for removing dross in snout for continuous molten metal plating
JPH02305948A (en) * 1989-05-19 1990-12-19 Kawasaki Steel Corp Dross removing device for inside of snout for continuous hot dip metal coating
JPH03150338A (en) * 1989-11-07 1991-06-26 Nippon Steel Corp Production of continuous alloying hot dip galvanized steel sheet
JPH04120258A (en) * 1990-09-12 1992-04-21 Kawasaki Steel Corp Method and device for continuous hot dip galvanizing
JPH05279827A (en) * 1992-03-31 1993-10-26 Kawasaki Steel Corp Device for removing dross in snout in hot-dip metal coating
JPH11199997A (en) * 1998-01-14 1999-07-27 Nisshin Steel Co Ltd Snout of continuous hot dip coating device
JP2001335906A (en) * 2000-05-26 2001-12-07 Nippon Steel Hardfacing Co Ltd Device for removing foreign matter in snout

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HRP20030370B1 (en) 2005-04-30
KR100725557B1 (en) 2007-06-08
UA73220C2 (en) 2005-06-15
CN1479799A (en) 2004-03-03
EP1334217A1 (en) 2003-08-13
EE200300209A (en) 2003-08-15
DE60103925T2 (en) 2004-10-28
MXPA03004133A (en) 2003-08-19
HRP20030370A2 (en) 2003-06-30
ATE269427T1 (en) 2004-07-15
BR0100006A (en) 2002-07-09
JP3747199B2 (en) 2006-02-22
HUP0302618A3 (en) 2003-12-29
FR2816639A1 (en) 2002-05-17
RS50096B (en) 2009-01-22
BG64800B1 (en) 2006-04-28
BG107779A (en) 2004-01-30
YU36703A (en) 2005-11-28
HUP0302618A2 (en) 2003-11-28
NO20032089D0 (en) 2003-05-09
PT1334217E (en) 2004-10-29
NO20032089L (en) 2003-07-08
TR200401449T4 (en) 2004-07-21
YU40503A (en) 2005-11-28
ME00792B (en) 2012-03-20
DE60103925D1 (en) 2004-07-29
SK5382003A3 (en) 2004-01-08
CN1271234C (en) 2006-08-23
RS50049B (en) 2008-11-28
ZA200303500B (en) 2003-11-13
US20040052958A1 (en) 2004-03-18
US6936307B2 (en) 2005-08-30
MA25923A1 (en) 2003-10-01
WO2002038824A1 (en) 2002-05-16
KR20030048135A (en) 2003-06-18
JP2004513238A (en) 2004-04-30
FR2816639B1 (en) 2003-10-24
AU2377702A (en) 2002-05-21
ECSP034594A (en) 2003-09-24
EA004448B1 (en) 2004-04-29
CZ298795B6 (en) 2008-01-30
EE04644B1 (en) 2006-06-15
AU2002223777B2 (en) 2006-11-16
PL201517B1 (en) 2009-04-30
SK286793B6 (en) 2009-05-07
TW554073B (en) 2003-09-21
CZ20031294A3 (en) 2004-01-14
ES2223956T3 (en) 2005-03-01
DK1334217T3 (en) 2004-08-30
AR034274A1 (en) 2004-02-18
CA2428487A1 (en) 2002-05-16
CA2428487C (en) 2009-08-04
BR0100006B1 (en) 2010-12-28
HU226624B1 (en) 2009-04-28
EA200300553A1 (en) 2003-10-30
PL362615A1 (en) 2004-11-02

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