EP0451020A1 - Apparatus for continuous coating of a steel strip - Google Patents

Apparatus for continuous coating of a steel strip Download PDF

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Publication number
EP0451020A1
EP0451020A1 EP91400817A EP91400817A EP0451020A1 EP 0451020 A1 EP0451020 A1 EP 0451020A1 EP 91400817 A EP91400817 A EP 91400817A EP 91400817 A EP91400817 A EP 91400817A EP 0451020 A1 EP0451020 A1 EP 0451020A1
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EP
European Patent Office
Prior art keywords
liquid metal
crucible
rollers
steel strip
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91400817A
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German (de)
French (fr)
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EP0451020B1 (en
Inventor
Charles Domaine Du Bois Saint-Denis Brun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Publication of EP0451020A1 publication Critical patent/EP0451020A1/en
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Classifications

    • 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
    • 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

Definitions

  • the subject of the present invention is a method and a device for continuously coating a steel strip using a liquid metal, in particular zinc, zinc-aluminum or aluminum.
  • the present invention is particularly suitable for continuous hot-dip galvanizing.
  • the steel strip is immersed in the bath of liquid metal contained in a crucible and the path of said strip in the crucible is about 2.50 meters.
  • the iron of the strip is attacked by the bath of liquid metal and dissolves in said bath.
  • iron reacts with the elements of the bath to form solid intermetallic compounds in the form of particles, zinc-iron, zinc-iron-aluminum, or zincaluminium in the case of hot-dip galvanization.
  • These particles have a size ranging from a few microns to several hundred microns depending on the degree of saturation of the bath. Given the continuous stirring of the bath and according to their density and composition, these particles rise to the surface, or remain in saturation or even settle at the bottom of the bath. Consequently, the particles can be entrained by the strip and remain included in the coating. However, the inclusions of particles are detrimental to the surface appearance and to the use of hot-dip galvanized sheet, in particular for visible parts of the automobile body.
  • the large volume of the crucible has the drawback of making it difficult to purify the bath by filtration and of increasing the time necessary for any change in the composition of said bath.
  • the present invention aims to avoid these drawbacks and has the particular advantage of being able to continuously filter the entire bath after pollution on contact with the strip, while allowing rapid corrections to the composition of the bath.
  • FIG. 1 is a schematic view in elevation of the coating device according to the invention
  • FIG. 1 is a side view of FIG. 1.
  • the coating device comprises an enclosure 1 inside which a steel strip 2 passes.
  • the coating device also comprises, below the enclosure 1, a crucible main 3 containing liquid metal consisting of pure zinc without aluminum or lead.
  • This crucible is provided with heating means, not shown, for example by induction.
  • the enclosure 1 comprises an entry airlock 5 provided with guide cylinders 5a and an exit airlock 6, the two airlocks being supplied with pure nitrogen.
  • This enclosure 1 comprises, between the two airlocks 5 and 6, two pinch rollers 7 and 8, with a horizontal axis, motorized and between which the steel strip 2 is driven continuously from bottom to top.
  • the rollers 7 and 8 define a nip interval 9 which forms a coating zone 10 by partial retention of the liquid metal, as will be seen later.
  • the coating device also comprises means for bringing the molten metal into the coating zone 10 from the main crucible 3.
  • auxiliary crucible 11 provided with heating means 12, for example by induction, and arranged in the enclosure 1 above the rollers 7 and 8.
  • the auxiliary crucible 11 having a capacity of the order of two tonnes is connected to the main crucible 3 by a pipe 13 comprising a pump 14 with an adjustable flow rate from two tonnes to ten tonnes per hour, so as to transfer the liquid metal from the main crucible 3 to the auxiliary crucible 11.
  • a second pump can be mounted in parallel and put into service in case of failure of the first.
  • the auxiliary crucible 11 is provided at its upper part with an overflow spout 15 communicating with a trough 16 comprising at its lower part two supply ramps 17 disposed above the nip interval 9 of the rollers 7 and 8, each ramp 17 being placed on either side of the steel strip 2 (Fig. 2).
  • the supply ramps 17 are also connected to the base of the auxiliary crucible 11 by a pipe 18 forming an annex circuit closed by a buffer nozzle 19 at the bottom of said auxiliary crucible 11.
  • This auxiliary circuit 18 is closed in normal operation and can be opened in the event of a failure of the pump 14 so as to supply the coating zone 10 with the liquid metal contained in the auxiliary crucible 11 for 10 to 20 minutes.
  • the auxiliary crucible 11 also includes a hopper 20 to correct the quality of the liquid metal contained in said crucible 11, for example by the addition of elements such as, for example, aluminum, lead, or bismuth.
  • the pinch rollers 7 and 8 include a coating resistant to thermal stresses and not wetted by the liquid metal and are provided with wiping members, not shown, for example with nitrogen for preventing entrainment of liquid metal on the surface of said rollers.
  • the coating of the pinch rollers 7 and 8 may consist of a thin ceramic coating on steel, or a coating of non-porous and non-cracked molybdenum on steel.
  • Pinch rollers 7 and 8 can also be formed by ferrule rollers in silica or ceramic.
  • pinch rollers 7 and 8 may also include internal heating means, not shown, constituted for example by electric heating candles or a gas radiant tube, to minimize thermal stresses.
  • the horizontal axes of the pinch rollers 7 and 8 can be offset vertically relative to each other to avoid bending the steel strip 2 as it passes around one of the rollers and in the nip interval of said rollers.
  • Wringing means formed, for example by ramps 21 placed on either side of the steel strip 2, are arranged about one meter above the coating area 10.
  • the steel strip 2 is wrung pneumatically under nitrogen with recirculation.
  • two pads 22 are applied for example by jacks 23 in said interval at an adjustable distance from the edge of the strip d steel 2.
  • pads 22 can be graphite or amorphous carbon or consist of compacted fibrous ceramic materials or organic materials resistant to high temperatures (up to 500 ° C) under nitrogen protection.
  • the coating device also includes means for recovering and recycling the excess liquid metal flowing through the nip 9 of the rollers 7 and 8.
  • These means consist of a retention tank 25 made of refractory material disposed below said nip interval 9 and the bottom of which comprises two orifices 26a which can be closed alternately by a buffer nozzle 26.
  • each orifice 26a is placed a recovery crucible 27 each provided with heating means 28, for example by induction, and possibly with a filter 29.
  • Each crucible 27 is connected by a funnel 30 to the main crucible 3.
  • the liquid metal returns directly to the main crucible.
  • each recovery crucible 27 is provided with means 31 for detecting the overflow of the liquid metal of said crucible formed for example by a photoelectric cell targeting the overflow spout 27a of the corresponding crucible (FIG. 1).
  • the coating device according to the invention operates in the following manner.
  • the main crucible 3 is filled with liquid metal, in particular pure zinc without aluminum or lead, the liquid metal being maintained at the desired temperature by the heating means.
  • the pump 14 transfers the liquid metal via the line 13 into the auxiliary crucible 11 where it is maintained at the desired temperature by the heating means 12.
  • the liquid metal in particular zinc
  • the liquid metal can be corrected by additions to the hopper, for example aluminum, lead or bismuth.
  • the temperature of the liquid metal can also be modified by the heating means 12.
  • the liquid metal necessary for coating the steel strip 2 feeds, by overflow from the auxiliary crucible 11, the nip interval 9 of the rollers 7 and 8 via the chute 16 and ramps 17.
  • the steel strip 2 entrained by the rollers 7 and 8 therefore crosses the coating zone 10 filled with liquid metal and is wrung by the ramps 21 at about one meter from its exit from said coating zone 10.
  • the height of the liquid metal in the coating zone 10 is regulated by acting on the flow rate of the pump 14 for a fixed position of the pads 22.
  • the height of the liquid metal in the coating zone 10 can also be controlled by acting on the distance of the pads 22 from the edges of the steel strip 2 so as to avoid any risk of liquid metal overflowing and to prevent leaks. liquid metal to the bearings of rollers 7 and 8.
  • the supply of liquid metal to the zone coating 10 can be ensured by the liquid metal contained in said auxiliary crucible for 10 to 20 minutes, by opening the buffer nozzle 19 located at the bottom of the auxiliary crucible 11 so as to supply the ramps 17.
  • the overflow of the liquid metal from the recovery crucible 17 in service is detected by the photoelectric cell 31 targeting the overflow spout 27 of the crucible and causes the change of the filtration crucible.
  • the liquid metal purified by the filter 29 returns to the main crucible 3 through the funnel 30.
  • the coating of the steel strip 2 can be removed at any time by stopping the pump 14.
  • the means for continuously feeding the liquid metal into the coating zone 10 are formed by the line 13 comprising at least one feed pump 14 and connected directly to the supply ramp 17 located at the above said coating zone 10.
  • the device operates without the auxiliary crucible 11, the liquid metal being pumped directly from the main crucible 3.
  • the device according to the invention makes it possible, under equal galvanizing conditions, to limit the quantity of zinc brought into contact with the steel strip to what is necessary for said galvanizing, while obtaining normal adhesion. It also allows rapid corrections to the composition of the liquid metal bath and limits the addition of aluminum to the strict necessary quantity and only for products that require it.
  • the method according to the invention makes it possible to continuously filter all the liquid metal after pollution on contact with the steel strip and consequently to limit the quantity of intermetallic compounds present in the bath, which makes it possible to improve the surface appearance. sheet metal in particular for visible parts of the automobile body.
  • the device according to the invention also has the advantage of being able to operate continuously even in the event of incidents and of being able to be installed without dismantling the normal equipment of the installations used until now.
  • Another advantage of the device according to the invention lies in the fact that it can be easily installed in a continuous annealing line.
  • this type of installation comprises two rollers with horizontal axis between which the steel strip is driven continuously from bottom to top and which play the role of the annealing system.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating Apparatus (AREA)
  • Coating With Molten Metal (AREA)
  • Spray Control Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Process for continuously coating a steel strip with a liquid metal contained in a main crucible (3). The process consists in causing the steel strip (2) to travel continuously from the bottom upwards between two nip rolls (7, 8) with a horizontal axis, in creating a bath of purified liquid metal in the region of the nip gap (9) of the two rolls (7, 8) by continuously delivering the said liquid metal from the main crucible (3) and in controlling the height of liquid metal in the said bath. The invention also relates to a device for implementing the process. <IMAGE>

Description

La présente invention a pour objet un procédé et un dispositif de revêtement en continu d'une bande d'acier au moyen d'un métal liquide notamment de zinc, de zinc-aluminium ou d'aluminium.The subject of the present invention is a method and a device for continuously coating a steel strip using a liquid metal, in particular zinc, zinc-aluminum or aluminum.

La présente invention est particulièrement adaptée à la galvanisation à chaud en continu.The present invention is particularly suitable for continuous hot-dip galvanizing.

Jusqu'à présent, la bande d'acier est immergée dans le bain de métal liquide contenu dans un creuset et le parcours de ladite bande dans le creuset est d'environ de 2,50 mètres.So far, the steel strip is immersed in the bath of liquid metal contained in a crucible and the path of said strip in the crucible is about 2.50 meters.

Au cours de l'immersion, le fer de la bande se trouve attaqué par le bain de métal liquide et se dissout dans ledit bain.During immersion, the iron of the strip is attacked by the bath of liquid metal and dissolves in said bath.

Au delà la limite de la solubilité, le fer réagit avec les éléments du bain pour former des composés intermétalliques solides sous forme de particules, zinc-fer, zinc-fer-aluminium, ou zincaluminium dans le cas de la galvanisation au trempé à chaud.Beyond the limit of solubility, iron reacts with the elements of the bath to form solid intermetallic compounds in the form of particles, zinc-iron, zinc-iron-aluminum, or zincaluminium in the case of hot-dip galvanization.

Ces particules ont une taille allant de quelques microns à plusieurs centaines de microns en fonction du degré de saturation du bain. Compte-tenu du brassage continuel du bain et selon leur densité et leur composition, ces particules remontent à la surface, ou restent en saturation ou encore se déposent au fond du bain. Par conséquent, les particules peuvent être entrainées par la bande et restées incluses dans le revêtement. Or, les inclusions de particules sont préjudiciables à l'aspect de surface et à l'utilisation de la tôle galvanisée à chaud, en particulier pour les pièces visibles de carrosserie automobile.These particles have a size ranging from a few microns to several hundred microns depending on the degree of saturation of the bath. Given the continuous stirring of the bath and according to their density and composition, these particles rise to the surface, or remain in saturation or even settle at the bottom of the bath. Consequently, the particles can be entrained by the strip and remain included in the coating. However, the inclusions of particles are detrimental to the surface appearance and to the use of hot-dip galvanized sheet, in particular for visible parts of the automobile body.

Dans ces conditions, pour obtenir des revêtement possédant un état de surface correct, il faut diminuer l'attaque de la bande par des additions massives notamment d'aluminium. Or, l'enrichissement en aluminium du revêtement qui en résulte, est nuisible pour l'aptitude au soudage et peut entraîner d'autres problèmes d'aspect.Under these conditions, to obtain coatings with a correct surface condition, it must attack the strip by massive additions including aluminum. However, the aluminum enrichment of the coating which results is detrimental to the weldability and can lead to other appearance problems.

De plus, le volume important du creuset présente l'inconvénient de rendre difficile l'épuration du bain par filtration et d'accroître le temps nécessaire pour tout changement dans la composition dudit bain.In addition, the large volume of the crucible has the drawback of making it difficult to purify the bath by filtration and of increasing the time necessary for any change in the composition of said bath.

La présente invention a pour but d'éviter ces inconvénients et présente notamment l'avantage de pouvoir filtrer en continu l'ensemble du bain après pollution au contact de la bande, tout en permettant des corrections rapides de la composition du bain.The present invention aims to avoid these drawbacks and has the particular advantage of being able to continuously filter the entire bath after pollution on contact with the strip, while allowing rapid corrections to the composition of the bath.

La présente invention a ainsi pour objet un procédé de revêtement en continu d'une bande d'acier au moyen d'un métal liquide contenu dans un creuset principal chauffé, procédé dans lequel :

  • on met en circulation continue, de bas en haut, la bande d'acier entre deux rouleaux pinceurs à axe horizontal,
  • on crée au niveau de l'intervalle de pincement des deux rouleaux, un bain de métal liquide épuré en amenant en continu ledit métal liquide à partir du creuset principal,
  • on récupère et on recycle l'excès de métal liquide dudit bain, caractérisé en ce qu'on régule la hauteur du métal liquide dans ledit bain.
The subject of the present invention is therefore a process for continuously coating a steel strip using a liquid metal contained in a heated main crucible, process in which:
  • the steel strip is continuously circulated from bottom to top between two pinching rollers with a horizontal axis,
  • a bath of purified liquid metal is created at the nip interval of the two rollers by continuously bringing said liquid metal from the main crucible,
  • the excess liquid metal is recovered and recycled from said bath, characterized in that the height of the liquid metal in said bath is regulated.

Selon d'autres caractéristiques de l'invention :

  • on effectue en aval du bain de métal liquide, un essorage pneumatique, par exemple à l'azote, de la bande d'acier revêtue,
According to other characteristics of the invention:
  • there is carried out downstream of the liquid metal bath, a pneumatic spin, for example with nitrogen, of the coated steel strip,

L'invention a également pour objet un dispositif de revêtement en continu d'une bande d'acier au moyen d'un métal liquide contenu dans un creuset principal muni de moyens de chauffage, ledit dispositif comprenant :

  • deux rouleaux pinceurs à axe horizontal entre lesquels la bande d'acier est entrainée en continu de bas en haut,
  • des moyens d'amenée en continu du métal liquide épuré à partir dudit creuset principal, au niveau de l'intervalle de pincement des deux rouleaux formant une zone de revêtement de ladite bande,
  • des moyens de récupération et de recyclage dans le creuset principal de l'excès de métal liquide s'écoulant entre les deux rouleaux princeurs, caractérisé en ce qu'il comprend des moyens de régulation de la hauteur du métal liquide épuré dans la zone de revêtement.
The subject of the invention is also a device for continuously coating a steel strip by means of a liquid metal contained in a main crucible provided with heating means, said device comprising:
  • two pinch rollers with horizontal axis between which the steel strip is continuously driven from bottom to top,
  • means for continuously supplying the purified liquid metal from said main crucible, at the level of the nip of the two rollers forming a coating zone for said strip,
  • means for recovering and recycling in the main crucible the excess liquid metal flowing between the two main rollers, characterized in that it comprises means for regulating the height of the purified liquid metal in the coating zone .

Selon d'autres caractéristiques de l'invention :

  • il comprend également des moyens d'essorage de la bande d'acier revêtue, situés en aval de la zone de revêtement par rapport au sens de défilement de la bande d'acier,
  • les moyens d'amenée en continu du métal liquide dans la zone de revêtement sont formés par au moins un creuset auxiliaire muni de moyens de chauffage et raccordé, d'une part, au creuset principal par l'intermédiaire d'une conduite comportant au moins une pompe d'alimentation, et, d'autre part, à au moins une rampe d'alimentation située au-dessus de ladite zone de revêtement,
  • ladite rampe est alimentée en métal liquide par débordement du creuset principal,
  • ladite rampe est alimentée en métal liquidé par un circuit annexe relié à la base du creuset auxiliaire,
  • les moyens d'amenée en continu du métal liquide dans la zone de revêtement sont formés par une conduite comportant au moins une pompe d'alimentation et raccordée à au moins une rampe d'alimentation située au-dessus de ladite zone de revêtement.
  • les moyens de régulation de la hauteur du métal liquide dans la zone de revêtement sont formés par ladite pompe d'alimentation et par des moyens de contrôle de l'écoulement du métal liquide dans l'intervalle de pincement des deux rouleaux,
  • les moyens de contrôle de l'écoulement du métal liquide comprennent deux patins situés dans l'intervalle de pincement des deux rouleaux au niveau de la sortie de la bande d'acier desdits rouleaux et de part et d'autre de ladite bande,
  • lesdits patins sont déplaçables, d'une part, verticalement, et d'autre part, horizontalement par rapport au bord de la bande d'acier.
  • les axes horizontaux des rouleaux pinceurs sont décalés verticalement pour éviter le cambrage de la bande d'acier lors de son passage autour d'un des rouleaux et dans l'intervalle de pincement desdits rouleaux,
  • les rouleaux pinceurs comportent un revêtement résistant aux contraintes thermiques et non mouillé par le métal liquide,
  • les rouleaux pinceurs comportent des moyens de chauffage internes pour minimiser les contraintes thermiques,
  • chaque rouleau pinceur comporte des organes d'essorage, par exemple à l'azote, pour empêcher l'entrainement du métal liquide à la surface dudit rouleau,
  • les moyens d'essorage de la bande d'acier revêtue sont disposés à environ un mètre de la zone de revêtement,
  • les moyens de récupération et de recyclage dans le creuset principal de l'excès de métal liquide comprennent au moins un bac de rétention en matériau réfractaire disposé au-dessous de l'intervalle de pincement des rouleaux et communiquant avec au moins un creuset de récupération muni de moyens de chauffage et raccordés audit creuset principal,
  • les moyens de récupération et de recyclage comportent deux creusets de récupération en parallèle et alimentés alternativement par ledit bac de rétention,
  • ledit creuset de récupération comporte au moins un organe de filtration du métal liquide,
  • ledit creuset de récupération comporte un détecteur de débordement du métal liquide.
According to other characteristics of the invention:
  • it also includes means for wringing out the coated steel strip, located downstream of the coating zone with respect to the direction of travel of the steel strip,
  • the means for continuously feeding the liquid metal into the coating zone are formed by at least one auxiliary crucible provided with heating means and connected, on the one hand, to the main crucible by means of a pipe comprising at least a feed pump, and, on the other hand, at least one feed ramp located above said coating zone,
  • said ramp is supplied with liquid metal by overflow from the main crucible,
  • said ramp is supplied with liquid metal by an auxiliary circuit connected to the base of the auxiliary crucible,
  • the means for continuously feeding the molten metal into the coating zone are formed by a pipe comprising at least one supply pump and connected to at least one supply ramp located above said coating zone.
  • the means for regulating the height of the liquid metal in the coating area are formed by said feed pump and by means for controlling the flow of the liquid metal in the nip interval of the two rollers,
  • the means for controlling the flow of the liquid metal comprise two pads located in the nip of the two rollers at the outlet of the steel strip from said rolls and on either side of said strip,
  • said pads are movable, firstly, vertically, and secondly, horizontally relative to the edge of the steel strip.
  • the horizontal axes of the pinch rollers are vertically offset to avoid bending the steel strip when it passes around one of the rollers and in the nip interval of said rollers,
  • the pinch rollers have a coating resistant to thermal stress and not wetted by liquid metal,
  • the pinch rollers include internal heating means to minimize thermal stresses,
  • each pinch roller has wiping members, for example with nitrogen, to prevent entrainment of liquid metal on the surface of said roller,
  • the means for wringing off the coated steel strip are arranged at approximately one meter from the coating area,
  • the means of recovery and recycling in the main crucible of the excess liquid metal comprise at least one retention tank of refractory material disposed below the nip of the rollers and communicating with at least one recovery crucible provided heating means and connected to said main crucible,
  • the recovery and recycling means comprise two recovery crucibles in parallel and supplied alternately by said retention tank,
  • said recovery crucible comprises at least one member for filtering the liquid metal,
  • said recovery crucible includes a liquid metal overflow detector.

L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple, faite en référence aux dessins annéxés sur lesquels :The invention will be better understood using the description which follows, given solely by way of example, made with reference to the appended drawings in which:

- la Fig. 1 est une vue schématique en élévation du dispositif de revêtement selon l'invention,- Fig. 1 is a schematic view in elevation of the coating device according to the invention,

- la Fig. 2 est une vue de côté de la Fig. 1.- Fig. 2 is a side view of FIG. 1.

En se reportant aux figures, le dispositif de revêtement comporte une enceinte 1 à l'intérieur de laquelle défile une bande d'acier 2.Referring to the figures, the coating device comprises an enclosure 1 inside which a steel strip 2 passes.

Le dispositif de revêtement comporte également, au-dessous de l'enceinte 1, un creuset principal 3 contenant du métal liquide constitué de zinc pur sans aluminium, ni plomb.The coating device also comprises, below the enclosure 1, a crucible main 3 containing liquid metal consisting of pure zinc without aluminum or lead.

Ce creuset est muni de moyens de chauffage, non représentés, par exemple par induction.This crucible is provided with heating means, not shown, for example by induction.

L'enceinte 1 comporte un sas d'entrée 5 muni de cylindres de guidage 5a et un sas de sortie 6, les deux sas étant alimentés en azote pur.The enclosure 1 comprises an entry airlock 5 provided with guide cylinders 5a and an exit airlock 6, the two airlocks being supplied with pure nitrogen.

Cette enceinte 1 comporte, entre les deux sas 5 et 6, deux rouleaux pinceurs 7 et 8, à axe horizontal, motorisés et entre lesquels la bande d'acier 2 est entrainée en continu de bas en haut.This enclosure 1 comprises, between the two airlocks 5 and 6, two pinch rollers 7 and 8, with a horizontal axis, motorized and between which the steel strip 2 is driven continuously from bottom to top.

Les rouleaux 7 et 8 définissent un intervalle de pincement 9 qui forme une zone de revêtement 10 par retenue partielle du métal liquide, comme on le verra ultérieurement.The rollers 7 and 8 define a nip interval 9 which forms a coating zone 10 by partial retention of the liquid metal, as will be seen later.

Le dispositif de revêtement comprend également des moyens d'amenée du métal liquide dans la zone de revêtement 10 à partir du creuset principal 3.The coating device also comprises means for bringing the molten metal into the coating zone 10 from the main crucible 3.

Ces moyens sont constitués par un creuset auxiliaire 11 muni de moyens de chauffage 12, par exemple par induction, et disposé dans l'enceinte 1 au-dessus des rouleaux 7 et 8. Le creuset auxiliaire 11 ayant une capacité de l'ordre de deux tonnes est raccordé au creuset principal 3 par une conduite 13 comportant une pompe 14 de débit réglable de deux tonnes à dix tonnes par heure, de façon à transférer le métal liquide du creuset principal 3 vers le creuset auxiliaire 11.These means consist of an auxiliary crucible 11 provided with heating means 12, for example by induction, and arranged in the enclosure 1 above the rollers 7 and 8. The auxiliary crucible 11 having a capacity of the order of two tonnes is connected to the main crucible 3 by a pipe 13 comprising a pump 14 with an adjustable flow rate from two tonnes to ten tonnes per hour, so as to transfer the liquid metal from the main crucible 3 to the auxiliary crucible 11.

Une deuxième pompe peut être montée en parallèle et mise en service en cas de panne de la première.A second pump can be mounted in parallel and put into service in case of failure of the first.

Le creuset auxiliaire 11 est muni à sa partie supérieure d'un bec de débordement 15 communiquant avec une goulotte 16 comportant à sa partie inférieure deux rampes d'alimentation 17 disposées au-dessus de l'intervalle de pincement 9 des rouleaux 7 et 8, chaque rampe 17 étant placée de part et d'autre de la bande d'acier 2 (Fig. 2).The auxiliary crucible 11 is provided at its upper part with an overflow spout 15 communicating with a trough 16 comprising at its lower part two supply ramps 17 disposed above the nip interval 9 of the rollers 7 and 8, each ramp 17 being placed on either side of the steel strip 2 (Fig. 2).

Les rampes d'alimentation 17 sont également reliées à la base du creuset auxiliaire 11 par une conduite 18 formant un circuit annexe fermé par une busette à tampon 19 au bas dudit creuset auxiliaire 11.The supply ramps 17 are also connected to the base of the auxiliary crucible 11 by a pipe 18 forming an annex circuit closed by a buffer nozzle 19 at the bottom of said auxiliary crucible 11.

Ce circuit annexe 18 est fermé en marche normale et peut être ouvert en cas de panne de la pompe 14 de façon à assurer l'alimentation de la zone de revêtement 10 par le métal liquide contenu dans le creuset auxiliaire 11 pendant 10 à 20 minutes.This auxiliary circuit 18 is closed in normal operation and can be opened in the event of a failure of the pump 14 so as to supply the coating zone 10 with the liquid metal contained in the auxiliary crucible 11 for 10 to 20 minutes.

Le creuset auxiliaire 11 comporte également une trémie 20 pour corriger la qualité du métal liquide contenu dans ledit creuset 11, par exemple par l'addition d'éléments tels que, par exemple, de l'aluminium, du plomb, ou du bismuth.The auxiliary crucible 11 also includes a hopper 20 to correct the quality of the liquid metal contained in said crucible 11, for example by the addition of elements such as, for example, aluminum, lead, or bismuth.

On peut également à ce niveau modifier la température du métal liquide par l'intermédiaire des moyens de chauffage 12.It is also possible at this level to modify the temperature of the liquid metal by means of the heating means 12.

D'autre part, les rouleaux pinceurs 7 et 8, de grand diamètre, comportent un revêtement résistant aux contraintes thermiques et non mouillé par le métal liquide et sont munis d'organes d'essorage, non représentés, par exemple à l'azote pour empêcher l'entrainement du métal liquide à la surface desdits rouleaux.On the other hand, the pinch rollers 7 and 8, of large diameter, include a coating resistant to thermal stresses and not wetted by the liquid metal and are provided with wiping members, not shown, for example with nitrogen for preventing entrainment of liquid metal on the surface of said rollers.

Le revêtement des rouleaux pinceurs 7 et 8 peut être constitué par un revêtement céramique mince sur acier, ou un revêtement de molybdène non poreux et non fissuré sur acier. Les rouleaux pinceurs 7 et 8 peuvent aussi être formés par des rouleaux à virole en silice ou en céramique.The coating of the pinch rollers 7 and 8 may consist of a thin ceramic coating on steel, or a coating of non-porous and non-cracked molybdenum on steel. Pinch rollers 7 and 8 can also be formed by ferrule rollers in silica or ceramic.

Par ailleurs, ces rouleaux pinceurs 7 et 8 peuvent également comporter des moyens de chauffage internes, non représentés, constitués par exemple par des bougies chauffantes électriques ou un tube radiant au gaz, pour minimiser les contraintes thermiques.Furthermore, these pinch rollers 7 and 8 may also include internal heating means, not shown, constituted for example by electric heating candles or a gas radiant tube, to minimize thermal stresses.

Les axes horizontaux des rouleaux pinceurs 7 et 8 peuvent être décalés verticalement l'un par rapport à l'autre pour éviter le cambrage de la bande d'acier 2 lors de son passage autour d'un des rouleaux et dans l'intervalle de pincement desdits rouleaux.The horizontal axes of the pinch rollers 7 and 8 can be offset vertically relative to each other to avoid bending the steel strip 2 as it passes around one of the rollers and in the nip interval of said rollers.

Des moyens d'essorage formés, par exemple par des rampes 21 placées de part et d'autre de la bande d'acier 2, sont disposés à environ un mètre au-dessus de la zone de revêtement 10. La bande d'acier 2 est essorée pneumatiquement sous azote avec recirculation.Wringing means formed, for example by ramps 21 placed on either side of the steel strip 2, are arranged about one meter above the coating area 10. The steel strip 2 is wrung pneumatically under nitrogen with recirculation.

Pour contrôler l'écoulement du métal liquide dans l'intervalle de pincement 9 des rouleaux 7 et 8, deux patins 22 (Fig. 2) sont appliqués par exemple par des vérins 23 dans ledit intervalle à une distance réglable du bord de la bande d'acier 2.To control the flow of liquid metal in the nip interval 9 of the rollers 7 and 8, two pads 22 (Fig. 2) are applied for example by jacks 23 in said interval at an adjustable distance from the edge of the strip d steel 2.

Ces patins 22 peuvent être en graphite ou en carbone amorphe ou constitués de matériaux céramiques fibreux compactés ou encore de matériaux organiques résistant aux hautes températures (jusqu'à 500°C) sous protection d'azote.These pads 22 can be graphite or amorphous carbon or consist of compacted fibrous ceramic materials or organic materials resistant to high temperatures (up to 500 ° C) under nitrogen protection.

Le dispositif de revêtement comporte également des moyens de récupération et de recyclage de l'excès de métal liquide s'écoulant à travers l'intervalle de pincement 9 des rouleaux 7 et 8. Ces moyens sont constitués par un bac de rétention 25 en matériau réfractaire disposé au-dessous dudit intervalle de pincement 9 et dont le fond comporte deux orifices 26a obturables alternativement par une busette à tampon 26.The coating device also includes means for recovering and recycling the excess liquid metal flowing through the nip 9 of the rollers 7 and 8. These means consist of a retention tank 25 made of refractory material disposed below said nip interval 9 and the bottom of which comprises two orifices 26a which can be closed alternately by a buffer nozzle 26.

Au-dessous de chaque orifice 26a est placé un creuset de récupération 27 muni chacun de moyens de chauffage 28, par exemple par induction, et éventuellement d'un filtre 29. Chaque creuset 27 est raccordé par un entonnoir 30 au creuset principal 3.Below each orifice 26a is placed a recovery crucible 27 each provided with heating means 28, for example by induction, and possibly with a filter 29. Each crucible 27 is connected by a funnel 30 to the main crucible 3.

Dans le cas où les creusets de récupération 27 ne comportent pas de filtres 29, le métal liquide retourne directement au creuset principal.In the case where the recovery crucibles 27 do not include filters 29, the liquid metal returns directly to the main crucible.

De plus, chaque creuset de récupération 27 est muni de moyens de détection 31 du débordement du métal liquide dudit creuset formés par exemple par une cellulle photoélectrique visant le bec de débordement 27a du creuset correspondant (Fig. 1).In addition, each recovery crucible 27 is provided with means 31 for detecting the overflow of the liquid metal of said crucible formed for example by a photoelectric cell targeting the overflow spout 27a of the corresponding crucible (FIG. 1).

Le dispositif de revêtement, selon l'invenion fonctionne de la manière suivante.The coating device according to the invention operates in the following manner.

Tout d'abord, le creuset principal 3 est rempli de métal liquide, notamment de zinc pur sans aluminium ni plomb, le métal liquide étant maintenu à la température désirée par les moyens de chauffage.First of all, the main crucible 3 is filled with liquid metal, in particular pure zinc without aluminum or lead, the liquid metal being maintained at the desired temperature by the heating means.

La pompe 14 transfère le métal liquide par la conduite 13 dans le creuset auxiliaire 11 où il est maintenu à la température désirée par les moyens de chauffage 12.The pump 14 transfers the liquid metal via the line 13 into the auxiliary crucible 11 where it is maintained at the desired temperature by the heating means 12.

A ce niveau, le métal liquide, notamment du zinc-peut être corrigé par des ajouts dans la trémie 20 par exemple d'aluminium, de plomb ou de bismuth. On peut également modifier la température du métal liquide par les moyens de chauffage 12.At this level, the liquid metal, in particular zinc, can be corrected by additions to the hopper, for example aluminum, lead or bismuth. The temperature of the liquid metal can also be modified by the heating means 12.

Le métal liquide nécessaire au revêtement de la bande d'acier 2 alimente, par débordement du creuset auxiliaire 11, l'intervalle de pincement 9 des rouleaux 7 et 8 par l'intermédiaire de la goulotte 16 et des rampes 17.The liquid metal necessary for coating the steel strip 2 feeds, by overflow from the auxiliary crucible 11, the nip interval 9 of the rollers 7 and 8 via the chute 16 and ramps 17.

La bande d'acier 2 entrainée par les rouleaux 7 et 8 traverse donc la zone de revêtement 10 remplie de métal liquide et subit un essorage par les rampes 21 à environ un mètre de sa sortie de ladite zone de revêtement 10.The steel strip 2 entrained by the rollers 7 and 8 therefore crosses the coating zone 10 filled with liquid metal and is wrung by the ramps 21 at about one meter from its exit from said coating zone 10.

La hauteur du métal liquide dans la zone de revêtement 10 est régulée en agissant sur le débit de la pompe 14 pour une position fixe des patins 22.The height of the liquid metal in the coating zone 10 is regulated by acting on the flow rate of the pump 14 for a fixed position of the pads 22.

On peut également contrôler la hauteur du métal liquide dans la zone de revêtement 10 en agissant sur la distance des patins 22 par rapport aux bords de la bande d'acier 2 de façon à éviter tout risque de débordement du métal liquide et à empêcher les fuites du métal liquide vers les paliers des rouleaux 7 et 8. En cas de panne de la pompe 14, détectée par l'arrêt de l'écoulement du métal liquide au bec 15 du creuset auxiliaire 11, l'alimentation en métal liquide de la zone de revêtement 10 peut être assurée par le métal liquide contenu dans ledit creuset auxiliaire pendant 10 à 20 minutes, en ouvrant la busette à tampon 19 située au bas du creuset auxiliaire 11 de façon à alimenter les rampes 17.The height of the liquid metal in the coating zone 10 can also be controlled by acting on the distance of the pads 22 from the edges of the steel strip 2 so as to avoid any risk of liquid metal overflowing and to prevent leaks. liquid metal to the bearings of rollers 7 and 8. In the event of failure of the pump 14, detected by stopping the flow of liquid metal at the spout 15 of the auxiliary crucible 11, the supply of liquid metal to the zone coating 10 can be ensured by the liquid metal contained in said auxiliary crucible for 10 to 20 minutes, by opening the buffer nozzle 19 located at the bottom of the auxiliary crucible 11 so as to supply the ramps 17.

L'excès de métal liquide s'écoule donc entre les deux rouleaux 7 et 8 et est recueilli dans le bac de rétention 25, puis dirigé vers l'un des creusets de récupération 27 en ouvrant l'orifice 26a correspondant.The excess of liquid metal therefore flows between the two rollers 7 and 8 and is collected in the retention tank 25, then directed towards one of the recovery crucibles 27 by opening the corresponding orifice 26a.

Le débordement du métal liquide du creuset de récupération 17 en service, par exemple par suite du colmatage du filtre correspondant 29, est détecté par la cellulle photoélectrique 31 visant le bec de débordement 27 du creuset et entraine le changement de creuset de filtration.The overflow of the liquid metal from the recovery crucible 17 in service, for example as a result of the clogging of the corresponding filter 29, is detected by the photoelectric cell 31 targeting the overflow spout 27 of the crucible and causes the change of the filtration crucible.

Le métal liquide épuré par le filtre 29 retourne au creuset principal 3 par l'entonnoir 30.The liquid metal purified by the filter 29 returns to the main crucible 3 through the funnel 30.

Le revêtement de la bande d'acier 2 peut être supprimé à tout moment en arrêtant la pompe 14.The coating of the steel strip 2 can be removed at any time by stopping the pump 14.

Selon un autre mode de réalisation, les moyens d'amenée en continu du métal liquide dans la zone de revêtement 10 sont formés par la conduite 13 comportant au moins une pompe d'alimenation 14 et raccordée directement à la rampe d'alimentation 17 située au-dessus de ladite zone de revêtement 10. Dans ce cas, le dispositif fonctionne sans le creuset auxilaire 11, le métal liquide étant pompé directement du creuset principal 3.According to another embodiment, the means for continuously feeding the liquid metal into the coating zone 10 are formed by the line 13 comprising at least one feed pump 14 and connected directly to the supply ramp 17 located at the above said coating zone 10. In this case, the device operates without the auxiliary crucible 11, the liquid metal being pumped directly from the main crucible 3.

Par rapport à une installation classique de galvanisation, le dispositif selon l'invention permet, à conditions égales de galvanisation, de limiter la quantité de zinc mise en contact avec la bande d'acier à ce qui est nécessaire pour ladite galvanisation, tout en obtenant une adhérence normale. Il permet également des corrections rapides de la composition du bain de métal liquide et de limiter les ajouts d'aluminium au strict nécesaire en quantité et seulement pour les produits qui le nécessitent.Compared to a conventional galvanizing installation, the device according to the invention makes it possible, under equal galvanizing conditions, to limit the quantity of zinc brought into contact with the steel strip to what is necessary for said galvanizing, while obtaining normal adhesion. It also allows rapid corrections to the composition of the liquid metal bath and limits the addition of aluminum to the strict necessary quantity and only for products that require it.

Le procédé selon l'invention permet de filtrer en continu tout le métal liquide après pollution au contact de la bande d'acier et par conséquent de limiter la quantité de composés intermétalliques présent dans le bain ce qui permet d'améliorer l'aspect de surface de la tôle en particulier pour les pièces visibles de carrosserie automobile.The method according to the invention makes it possible to continuously filter all the liquid metal after pollution on contact with the steel strip and consequently to limit the quantity of intermetallic compounds present in the bath, which makes it possible to improve the surface appearance. sheet metal in particular for visible parts of the automobile body.

Enfin, le dispositif selon l'invention présente également l'avantage de pouvoir fonctionner en continu même en cas d'incidents et de pouvoir être mis en place sans démontage des équipements normaux des installations utilisées jusqu'à présent.Finally, the device according to the invention also has the advantage of being able to operate continuously even in the event of incidents and of being able to be installed without dismantling the normal equipment of the installations used until now.

Un autre avantage du dispositif selon l'invention réside dans le fait qu'il peut être facilement installé dans une ligne de recuit en continu.Another advantage of the device according to the invention lies in the fact that it can be easily installed in a continuous annealing line.

En effet, ce type d'installation comporte deux rouleaux à axe horizontal entre lesquels la bande d'acier est entrainée en continu de bas en haut et qui jouent le rôle du système de recuit.Indeed, this type of installation comprises two rollers with horizontal axis between which the steel strip is driven continuously from bottom to top and which play the role of the annealing system.

Par conséquent, pour pouvoir utiliser une installation de ce genre fonctionnant soit en ligne de recuit, soit en ligne de revêtement, il suffit de l'équiper du dispositif selon l'invention.Consequently, in order to be able to use an installation of this kind operating either on the annealing line or on the coating line, it suffices to equip it with the device according to the invention.

Claims (20)

Procédé de revêtement en continu d'une bande d'acier (2) au moyen d'un métal liquide contenu dans un creuset principal (3) chauffé, procédé dans lequel : - on met en circulation continue, de bas en haut, la bande d'acier (2) entre deux rouleaux pinceurs (7, 8) à axe horizontal, - on crée au niveau de l'intervalle de pincement ( 9 ) des deux rouleaux ( 7, 8 ), un bain de métal liquide épuré en amenant en continu ledit métal liquide à partir du creuset principal ( 3 ), - on récupère et on recyle l'excès de métal liquide dudit bain,
caractérisé en ce qu'on régule la hauteur du métal liquide dans ledit bain. Process for continuously coating a steel strip (2) with a liquid metal contained in a main crucible (3) heated, process in which: - the steel strip (2) is continuously circulated from bottom to top between two pinch rollers (7, 8) with a horizontal axis, - a bath of purified liquid metal is created at the nip (9) of the two rollers (7, 8) by continuously bringing said liquid metal from the main crucible (3), - the excess liquid metal from said bath is recovered and recycled
characterized in that the height of the liquid metal in said bath is regulated. Procédé suivant la revendication 1, caractérisé en ce qu'on effectue, en aval du bain de métal liquide, un essorage (21) pneumatique, par exemple à l'azote, de la bande d'acier (2) revêtue, avec recirculation.Process according to Claim 1, characterized in that a pneumatic spin (21), for example with nitrogen, of the coated steel strip (2), with recirculation, is carried out downstream of the liquid metal bath. Dispositif de revêtement continu d'une bande d'acier (2) au moyen d'un métal liquide contenu dans un creuset principal (3) muni de moyens de chauffage, ledit dispositif comprenant : - deux rouleaux pinceurs (7, 8) à axe horizontal entre lesquels la bande d'acier (2) est entrainée en continu de bas en haut, - des moyens d'amenée en continu du métal liquide épuré, à partir dudit creuset principal (3), au niveau de l'intervalle de pincement (9) des deux rouleaux (7, 8) formant une zone de revêtement (10) de ladite bande (2) , - des moyens (25, 27, 30) de récupération et de reçyclage dans le creuset principal (3) de l'excès de métal liquide s'écoulant entre les deux rouleaux princeurs (7, 8),
caractérisé en ce qu'il comprend des moyens (14, 22, 23) de régulation de la hauteur du métal liquide épuré dans la zone de revêtement (10). Device for continuously coating a steel strip (2) by means of a liquid metal contained in a main crucible (3) provided with heating means, said device comprising: - two pinch rollers (7, 8) with horizontal axis between which the steel strip (2) is driven continuously from bottom to top, - means for continuously supplying the purified liquid metal, from said main crucible (3), at the pinch interval (9) of the two rollers (7, 8) forming a coating zone (10) of said strip (2), - means (25, 27, 30) for recovery and to recycle in the main crucible (3) the excess liquid metal flowing between the two main rollers (7, 8),
characterized in that it comprises means (14, 22, 23) for regulating the height of the purified liquid metal in the coating zone (10). Dispositif selon la revendication 3, caractérisé en ce qu'il comprend également : - des moyens (21) d'essorage de la bande d'acier (2) revêtue situés en aval de la zone de revêtement (10) par rapport au sens de défilement de ladite bande d'acier (2), Device according to claim 3, characterized in that it also comprises: means (21) for wiping the coated steel strip (2) located downstream of the coating zone (10) relative to the direction of travel of said steel strip (2), Dispositif selon la revendication 3, caractérisé en ce que les moyens d'amenée en continu du métal liquide dans la zone de revêtement (10) sont formés par au moins un creuset auxiliaire (11) muni de moyens de chauffage (12) et raccordé, d'une part, au creuset principal (3) par l'intermédiaire d'une conduite (13) comportant au moins une pompe d'alimentation (14) et, d'autre part, à au moins une rampe d'alimentation (17) située au-dessus de ladite zone de revêtement (10).Device according to claim 3, characterized in that the means for continuously feeding the liquid metal into the coating zone (10) are formed by at least one auxiliary crucible (11) provided with heating means (12) and connected, on the one hand, to the main crucible (3) via a pipe (13) comprising at least one feed pump (14) and, on the other hand, to at least one feed ramp (17 ) located above said coating area (10). Dispositif selon la revendication 5, caractérisé en ce que ladite rampe (17) est alimentée en métal liquide par débordement du creuset auxiliaire (11).Device according to claim 5, characterized in that said ramp (17) is supplied with liquid metal by overflowing of the auxiliary crucible (11). Dispositif selon la revendication 5, caractérisé en ce que ladite rampe (17) est alimentée en métal liquide par un circuit annexe (18, 19) relié à la base du creuset auxiliaire (11).Device according to claim 5, characterized in that said ramp (17) is supplied with liquid metal by an auxiliary circuit (18, 19) connected to the base of the auxiliary crucible (11). Dispositif selon la revendication 3, caractérisé en ce que les moyens d'amenée en continu du métal liquide dans la zone de revêtement (10) sont formés par une conduite (13) comportant au moins une pompe d'alimentation (14) et raccordée à au moins une rampe d'alimentation (17) située au-dessus de ladite zone de revêtement (10).Device according to claim 3, characterized in that the means for continuously feeding the molten metal into the coating zone (10) are formed by a pipe (13) comprising at least one feed pump (14) and connected to at least one feed ramp (17) located above said coating area (10). Dispositif selon l'une des revendications 3, 5 ou 8, caractérisé en ce que les moyens de régulation de la hauteur du métal liquide dans la zone de revêtement (10) sont formés par ladite pompe d'alimentation (14) et par des moyens de contrôle de l'écoulement du métal liquide dans l'intervalle de pincement (9) des deux rouleaux (7, 8).Device according to one of claims 3, 5 or 8, characterized in that the means for regulating the height of the liquid metal in the coating zone (10) are formed by said feed pump (14) and by means for controlling the flow of liquid metal in the nip gap (9) of the two rollers (7, 8). Dispositif selon la revendication 9, caractérisé en ce que les moyens de contrôle de l'écoulement du métal liquide comprennent deux patins (22) situés dans l'intervalle de pincement (9) des deux rouleaux (7, 8) au niveau de la sortie de la bande d'acier (2) desdits rouleaux et de part et d'autre de ladite bande.Device according to claim 9, characterized in that the means for controlling the flow of the molten metal comprise two pads (22) located in the nip (9) of the two rollers (7, 8) at the outlet of the steel strip (2) of said rollers and on either side of said strip. Dispositif suivant la revendication 10, caractérisé en ce que lesdits patins (22) sont déplaçables, d'une part, verticalement et, d'autre part, horizontalement par rapport aux bords de la bande d'acier (2).Device according to claim 10, characterized in that said pads (22) are movable, on the one hand, vertically and, on the other hand, horizontally with respect to the edges of the steel strip (2). Dispositif selon la revendication 3, caractérisé en ce que les axes horizontaux des rouleaux pinceurs (7, 8) sont décalés verticalement pour éviter le cambrage de la bande d'acier lors de son passage autour d'un des rouleaux (7, 8) et dans l'intervalle de pincement (9) desdits rouleaux (7, 8).Device according to claim 3, characterized in that the horizontal axes of the pinch rollers (7, 8) are vertically offset to avoid bending the steel strip as it passes around one of the rollers (7, 8) and in the nip interval (9) of said rollers (7, 8). Dispositif selon la revendication 3, caractérisé en ce que les rouleaux pinceurs (7, 8) comportent un revêtement résistant aux contraintes thermiques et non mouillé par le métal liquide.Device according to claim 3, characterized in that the pinch rollers (7, 8) comprise a coating resistant to thermal stresses and not wetted by the liquid metal. Dispositif selon la revendication 3, caractérisé en ce que les rouleaux pinceurs (7, 8) comportent des moyens de chauffage internes pour minimiser les contraintes thermiques.Device according to claim 3, characterized in that the pinch rollers (7, 8) include internal heating means to minimize thermal stresses. Dispositif selon la revendication 3, caractérisé en ce que chaque rouleau pinceur (7, 8) comporte des organes d'essorage, par exemple à l'azote, pour empêcher l'entrainement du métal liquide à la surface dudit rouleau.Device according to claim 3, characterized in that each pinch roller (7, 8) comprises wiping members, for example with nitrogen, to prevent entrainment of the liquid metal on the surface of said roller. Dispositif selon la revendication 3, caractérisé en ce que les moyens d'essorage (21) de la bande d'acier (2) revêtue sont disposés à environ un mètre de la zone de revêtement (10).Device according to claim 3, characterized in that the wiping means (21) of the coated steel strip (2) are arranged about one meter from the coating area (10). Dispositif selon la revendication 3, caractérisé en ce que les moyens de récupération et de recyclage dans le creuset principal (3) de l'excès de métal liquide comprennent au moins un bac de rétention (25) en matériau réfractaire disposé en-dessous de l'intervalle de pincement (9) des rouleaux (7, 8) et communiquant avec au moins un creuset de récupération (27) muni de moyens de chauffage (28) et raccordé audit creuset principal (3).Device according to claim 3, characterized in that the means for recovering and recycling in the main crucible (3) the excess of liquid metal comprise at least one retention tank (25) of refractory material placed below the 'nip interval (9) of the rollers (7, 8) and communicating with at least one recovery crucible (27) provided with heating means (28) and connected to said main crucible (3). Dispositif selon la revendication 17, caractérisé en ce que les moyens de récupération et de recyclage comportent deux creusets de récupération (27) en parallèle et alimentés alternativement par ledit bac de rétention (25).Device according to claim 17, characterized in that the recovery and recycling means comprise two recovery crucibles (27) in parallel and supplied alternately by said retention tank (25). Dispositif selon les revendications 17 et 18, caractérisé en ce que ledit creuset de récupération (27) comporte au moins un organe de filtration (29) du métal liquide.Device according to claims 17 and 18, characterized in that said recovery crucible (27) comprises at least one filter member (29) of the liquid metal. Dispositif selon les revendications 17 et 18, caractérisé en ce que ledit creuset de récupération (27) comporte un détecteur de débordement (31) du métal liquide.Device according to claims 17 and 18, characterized in that said recovery crucible (27) comprises an overflow detector (31) of the liquid metal.
EP91400817A 1990-03-28 1991-03-26 Apparatus for continuous coating of a steel strip Expired - Lifetime EP0451020B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9003963 1990-03-28
FR9003963A FR2660325B1 (en) 1990-03-28 1990-03-28 METHOD AND DEVICE FOR CONTINUOUSLY COATING A STEEL STRIP.

Publications (2)

Publication Number Publication Date
EP0451020A1 true EP0451020A1 (en) 1991-10-09
EP0451020B1 EP0451020B1 (en) 1995-07-19

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Family Applications (1)

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EP91400817A Expired - Lifetime EP0451020B1 (en) 1990-03-28 1991-03-26 Apparatus for continuous coating of a steel strip

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EP (1) EP0451020B1 (en)
AT (1) ATE125309T1 (en)
DE (1) DE69111281T2 (en)
ES (1) ES2075380T3 (en)
FR (1) FR2660325B1 (en)
GR (1) GR3017314T3 (en)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO1993018198A1 (en) * 1992-03-13 1993-09-16 Mannesmann Ag Process for coating the surface of elongated materials
WO2005001152A1 (en) * 2003-06-27 2005-01-06 Sms Demag Aktiengesellschaft Method for hot dip coating a metal bar and method for hot dip coating
ITMI20111544A1 (en) * 2011-08-24 2013-02-25 Danieli Off Mecc PLANT FOR THE COATING WITH IMMERSION CONTINUOUSLY HOT OF METALLIC PRODUCTS, PLANS AND RELATED COATING PROCESS

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE10361055A1 (en) * 2003-12-22 2005-07-21 Eap Lachnit Gmbh Method for surface coating of regular/irregular components with flat surfaces with material application prepared for full width of outlet, but applied to surfaces only, and residue returned

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FR1248834A (en) * 1960-02-17 1960-12-23 Continental Can Co Method and apparatus for coating a base metal with aluminum
US3828723A (en) * 1973-05-17 1974-08-13 Thompson E Galvanizing apparatus for wire and the like
FR2341199A1 (en) * 1976-02-11 1977-09-09 Commissariat Energie Atomique METHOD AND DEVICE FOR TRAINING AND DEPOSITION ON A SUBSTRATE OF MONOMOLECULAR LAYERS OF AMPHIPHILIC MOLECULES

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JPS60245774A (en) * 1984-05-18 1985-12-05 Kobe Steel Ltd Hot dipping method
JPS63140070A (en) * 1986-12-03 1988-06-11 Nkk Corp Apparatus for removing fine impurity in hot dipping bath
JPH0610331B2 (en) * 1987-02-05 1994-02-09 川崎製鉄株式会社 Molten metal plating device
JPH01139744A (en) * 1987-11-25 1989-06-01 Nippon Steel Corp Hot dipping device
JPH01180954A (en) * 1988-01-13 1989-07-18 Kobe Steel Ltd Hot dip metal coating device
JPH0215155A (en) * 1988-07-04 1990-01-18 Hitachi Ltd Continuous type hot dipping device

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FR1248834A (en) * 1960-02-17 1960-12-23 Continental Can Co Method and apparatus for coating a base metal with aluminum
US3828723A (en) * 1973-05-17 1974-08-13 Thompson E Galvanizing apparatus for wire and the like
FR2341199A1 (en) * 1976-02-11 1977-09-09 Commissariat Energie Atomique METHOD AND DEVICE FOR TRAINING AND DEPOSITION ON A SUBSTRATE OF MONOMOLECULAR LAYERS OF AMPHIPHILIC MOLECULES

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PATENT ABSTRACTS OF JAPAN, vol. 12, no. 398 (C-538)[3245] 21 Octobre 1988; & JP-A-63 140 070 (NIPPON KOKAN) 11 Juin 1988 *
PATENT ABSTRACTS OF JAPAN, vol. 13, no. 466 (C-646)[3814] 20 Octobre 1989; & JP-A-01 180 954 (KOBE STEEL) 18 Juillet 1989 *
PATENT ABSTRACTS OF JAPAN, vol. 14, no. 146 (C-704)[4089] 20 Mars 1990; & JP-A-02 015 155 (HITACHI) 18 Janvier 1990 *
PATENT ABSTRACTS OF JAPAN, vol. 3, no. 138 (C-64) 16 Novembre 1979; & JP-A-54 117 331 (SHIN NIPPON SEITETSU) 12 Septembre 1979 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993018198A1 (en) * 1992-03-13 1993-09-16 Mannesmann Ag Process for coating the surface of elongated materials
WO2005001152A1 (en) * 2003-06-27 2005-01-06 Sms Demag Aktiengesellschaft Method for hot dip coating a metal bar and method for hot dip coating
AU2004252229B2 (en) * 2003-06-27 2009-12-03 Sms Siemag Aktiengesellschaft Method for hot dip coating a metal bar and method for hot dip coating
ITMI20111544A1 (en) * 2011-08-24 2013-02-25 Danieli Off Mecc PLANT FOR THE COATING WITH IMMERSION CONTINUOUSLY HOT OF METALLIC PRODUCTS, PLANS AND RELATED COATING PROCESS
WO2013027179A1 (en) * 2011-08-24 2013-02-28 Danieli & C. Officine Meccaniche S.P.A. Plant for coating flat metal products by means of continuous hot dipping and relative coating process
CN103890218A (en) * 2011-08-24 2014-06-25 丹尼尔和科菲森梅克尼齐有限公司 Plant for coating flat metal products by means of continuous hot dipping and relative coating process

Also Published As

Publication number Publication date
FR2660325B1 (en) 1994-01-21
EP0451020B1 (en) 1995-07-19
ES2075380T3 (en) 1995-10-01
GR3017314T3 (en) 1995-12-31
FR2660325A1 (en) 1991-10-04
DE69111281T2 (en) 1995-12-21
DE69111281D1 (en) 1995-08-24
ATE125309T1 (en) 1995-08-15

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