EP1337681B1 - Installation for dip coating of a metal strip - Google Patents
Installation for dip coating of a metal strip Download PDFInfo
- Publication number
- EP1337681B1 EP1337681B1 EP01993714A EP01993714A EP1337681B1 EP 1337681 B1 EP1337681 B1 EP 1337681B1 EP 01993714 A EP01993714 A EP 01993714A EP 01993714 A EP01993714 A EP 01993714A EP 1337681 B1 EP1337681 B1 EP 1337681B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheath
- bath
- metal
- strip
- steel strip
- 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.)
- Expired - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 title claims description 26
- 239000002184 metal Substances 0.000 title claims description 26
- 238000009434 installation Methods 0.000 title claims description 22
- 238000003618 dip coating Methods 0.000 title claims 2
- 239000002245 particle Substances 0.000 claims description 13
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 3
- 229910000765 intermetallic Inorganic materials 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims 3
- 238000001035 drying Methods 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 51
- 229910000831 Steel Inorganic materials 0.000 description 50
- 239000010959 steel Substances 0.000 description 50
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 36
- 229910052725 zinc Inorganic materials 0.000 description 36
- 239000011701 zinc Substances 0.000 description 36
- 230000007547 defect Effects 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000005246 galvanizing Methods 0.000 description 8
- 238000007598 dipping method Methods 0.000 description 6
- 235000014692 zinc oxide Nutrition 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 238000007654 immersion Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical class [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 4
- 239000001995 intermetallic alloy Substances 0.000 description 3
- 229910007570 Zn-Al Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
Images
Classifications
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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
- C23C2/04—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
Definitions
- the present invention relates to a hot dipping coating plant and continuously a metal strip, including a steel strip.
- steel sheets coated with a protective layer for example against corrosion and usually coated with a zinc layer are used.
- This type of sheet is used in various industries to make all kinds of parts including appearance parts.
- an Fe-Zn-Al intermetallic alloy is formed on the surface of said strip with a thickness of some ten nanometers.
- the corrosion resistance of the parts thus coated is ensured by the zinc, the thickness of which is most often produced by pneumatic wringing.
- the adhesion of the zinc on the metal strip is provided by the intermetallic alloy layer mentioned above.
- this steel strip Before the passage of the steel strip in the bath of molten metal, this steel strip first circulates in a annealing furnace under a reducing atmosphere in order to recrystallize it after the important work hardening related to the rolling operation. cold, and prepare its chemical surface state to promote the chemical reactions necessary for the actual quenching operation.
- the steel strip is brought to about 650 to 900 ° C depending on the grade for the time required for recrystallization and surface preparation. It is then cooled to a temperature close to that of the molten metal bath using exchangers.
- the steel strip After passing through the annealing furnace, the steel strip passes through a sheath also called “bell drop” or “horn” under a protective atmosphere with respect to the steel and is immersed in the bath of molten metal.
- a sheath also called "bell drop” or “horn” under a protective atmosphere with respect to the steel and is immersed in the bath of molten metal.
- the lower end of the sheath is immersed in the metal bath to determine, with the surface of said bath and inside this sheath, a liquid seal which is traversed by the steel strip during its scrolling in said sheath.
- the steel strip is deflected by a roll immersed in the metal bath and it emerges from the metal bath, then passes through the wiper means for regulating the thickness of the liquid metal coating on the steel strip.
- the surface of the liquid gasket inside the sheath is generally covered with zinc oxide, resulting from the reaction between the atmosphere inside this sheath and the zinc liquid seal and intermetallic or solid matte compounds from the dissolution reaction of the steel strip.
- These mattes or other particles, supersaturation in the zinc bath have a lower density than liquid zinc and go back to the surface of the bath and in particular to the surface of the liquid seal.
- the coated steel strip has appearance defects which are amplified or even revealed during the zinc wringing operation.
- the intruded particles are retained by the pneumatic wringing jets before being ejected or disintegrated, thus creating sub-thick streaks in the liquid zinc of a length of a few millimeters to a few centimeters.
- a first solution to avoid these disadvantages consists in cleaning the surface of the liquid seal by pumping zinc oxides and mattes from the bath.
- a second solution is to reduce the surface of the liquid seal at the point of passage of the steel strip by placing a plate of sheet metal or ceramic at this liquid seal to keep away from the band a portion of the particles present on the surface and get a self-cleaning of the liquid seal by this tape.
- This arrangement does not allow to remove all the particles present on the surface of the liquid seal and the self-cleaning is all the more important that the surface of the liquid seal is reduced, which is incompatible with the industrial conditions of exploitation.
- Another solution is to add a frame to the surface of the liquid seal in the sheath and surrounding the steel strip.
- This arrangement does not completely eliminate the defects related to the entrainment of zinc oxides and mattes by the scrolling of the steel strip.
- the zinc vapors at the liquid seal will condense on the walls of the frame and the slightest swirl caused by the vibrations or the thermal folds of the strip to immersion, the walls of the frame will become dirty and thus become areas for storing foreign bodies.
- This solution can only work a few hours or even a day before becoming an additional source of defects.
- this solution only partially processes the liquid seal and does not achieve a very low density of defects satisfying the requirements of customers wanting surfaces without appearance defects.
- Renewal is achieved by introducing liquid zinc pumped into the bath in the vicinity of the immersion zone of the steel strip.
- the piping ensuring the renewal of liquid zinc can cause scratches on the steel strip before immersion and is itself a source of defects by accumulation of condensed zinc vapor above the liquid seal.
- a process is also known which is based on the renewal of zinc at the liquid seal and wherein this renewal is carried out using a stainless steel box surrounding the steel strip and opening on the surface of the liquid seal .
- a pump sucks the particles entrained by the spill thus created and pushes them back into the volume of the bath.
- This process also requires a very high pumping rate to maintain a permanent spill effect in that the box surrounding the strip in the bath volume above the bottom roller can not be hermetically sealed.
- the object of the invention is to propose a continuous galvanizing installation of a metal strip which makes it possible to avoid the drawbacks previously mentioned and achieve the very low density of defects satisfying the requirements of customers desiring surfaces without appearance defects.
- the subject of the invention is a continuous dipping coating installation of a metal strip according to claim 1.
- the steel strip 1 passes into an annealing furnace, not shown, under a reducing atmosphere in order to recrystallize it after the cold-rolling-forming process, and prepare its chemical surface state to promote the chemical reactions necessary for the galvanizing operation.
- the steel strip is brought to a temperature for example between 650 and 900 ° C.
- the steel strip 1 passes into a galvanizing installation shown in FIG. 1 and designated by the general reference 10.
- This installation 10 comprises a tank 11 containing a bath 12 of liquid zinc which contains chemical elements such as aluminum, iron and possible additives such as lead, antimony, in particular.
- the temperature of this liquid zinc bath is of the order of 460 ° C.
- 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.
- an Fe-Zn-Al intermetallic alloy forming a zinc coating is formed on the surface of the steel strip 1, the thickness of which is a function of the residence time of the steel strip 1 in the bath 12 of liquid zinc.
- the galvanizing installation 10 comprises a sheath 13 inside which the steel strip 1 passes under a protective atmosphere with respect to the steel.
- This sheath 13 also known as "bell drop” or “horn” has, in the embodiment shown in the figures, a rectangular cross section.
- the lower end of the sheath 13a is immersed in the zinc bath 12 so as to determine with the surface of said bath 12 and inside this sheath 13, a liquid seal 14.
- the steel strip 1 is deflected by a roller 15 commonly called a bottom roller and placed in the zinc bath 12. At the outlet of this zinc bath 12, the coated steel strip 1 passes into spinning means 16 which are for example constituted by air jet nozzles 16a and which are directed towards each side of the steel strip 1 to regulate the thickness of the liquid zinc coating.
- the lower end 13a of the sheath 13 is extended, on the opposite side of the face of the strip 1 located on the side of the deflector roll 15, by an inner wall 20 directed towards the surface of the liquid seal 14 and which is cleaning with the sheath 13, a spill compartment 21 liquid zinc to collect the particles of zinc oxides and intermetallic compounds that float on the surface of the liquid seal 14.
- the upper edge 20a of the inner wall 20 is positioned below the surface of the liquid seal 14 and the compartment 21 is provided with means, not shown, for maintaining the level of liquid zinc in said compartment at a level below. below the surface of the liquid seal 14 to achieve a natural flow of liquid zinc from this surface of said seal 14 to this compartment 21.
- the lower end 13a of the sheath 13 facing the face of the strip 1 placed opposite the deflector roll 15, is extended by an inner wall 22 directed towards the surface of the liquid seal 14 and leaving with sheath 13 a sealed compartment 23 for storing zinc oxide particles.
- the upper edge 22a of the inner wall 22 is positioned above the surface of the liquid seal 14.
- this compartment 23 serves as a receptacle for the zinc oxides that can come from the inclined bottom wall of the sheath and makes it possible to store these oxides in order to protect the steel strip 1.
- the upper edge 22a of the inner wall 22 may be positioned below the surface of the liquid seal 14 and, in this case, the compartment 23 is a liquid zinc spill compartment, such as the compartment 21.
- the steel strip 1 must enter the liquid zinc seal 14 without the risk of touching the walls 20 and 22 of the two compartments 21 and 23.
- the line of passage of the steel strip 1 between the walls 20 and 22 of the two compartments 21 and 23 is determined by the diameter of the deflector roll 15 and by its position.
- the sheath 13 comprises two parts, a fixed upper part 30 and a movable lower part 31, interconnected by a deformable element 32 so as to be able to modify the position of the movable lower part 31 of the sheath 13.
- deformable element 32 is constituted by a bellows, for example stainless steel and the lower portion 31 of the sheath 13 is associated with means 35 for positioning the inner walls 20 and 22 relative to the steel strip 1.
- the positioning means 35 comprise two actuating members, respectively 35a and 35b, constituted for example by hydraulic or pneumatic cylinders and connected to the lower part 31 of the sheath 13.
- the movable lower portion 31 of the sheath 13 is displaced in translation parallel to the surface of the liquid metal bath 12 when the displacement stroke of the actuating rods of said cylinders is identical, as shown in FIG. 3, In this case, the lower movable portion 31 remains parallel to itself.
- the lower movable portion 31 is pivotally displaced about the transverse virtual axis and in translation parallel to the surface liquid metal bath 12, as shown in FIG. 4.
- This arrangement has the advantage of making it possible to adjust independently, on the one hand, the position of the movable portion 31 of the sheath 13 with respect to the steel strip 1 and, on the other hand, the horizontality of said portion mobile. This also makes it possible to balance the flow of liquid metal flowing into each compartment 21 and 23 and thereby increase the efficiency of the installation.
- the position of the inner walls 20 and 22 of the compartments 21 and 23 is adjusted so that the steel strip 1 enters the liquid zinc seal 14 determined by said inner walls 20 and 22 without the risk of touching these walls.
- the installation comprises means 40 for guiding the steel strip 1 inside the sheath 13.
- These guide means 40 are formed by a deflector roll 41 or 42 placed in the sheath 13 to draw the line of passage of the steel strip 1 relative to the roll 15 and more easily adjust the passage of said steel strip 1 between the two walls 20 and 22 of the compartments 21 and 23.
- the deflector roll 41 is disposed on the face of the strip 1 opposite that in contact with the roll 15, as shown in FIG. 5, and in the case of a thicker steel strip 1, the baffle roll 42 is disposed on the face of the web 1 in contact with the drive roller 15, as shown in FIG. 6.
- the baffle roll 42 compensates for the bending of the steel strip 1 in the transverse direction which is related to the deformation gradient of the fibers of the steel strip, in its thickness, on the rolls of the furnace. upstream of the galvanizing tank.
- the invention applies to any metal coating by dipping.
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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 With Molten Metal (AREA)
- Coating Apparatus (AREA)
- Electroplating Methods And Accessories (AREA)
- Chemical Treatment Of Metals (AREA)
- Laminated Bodies (AREA)
Description
La présente invention concerne 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 hot dipping coating plant and continuously a metal strip, including 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 usually coated with a zinc layer are used.
Ce type de tôles est utilisé dans diverses industries pour réaliser toute sorte de pièces et notamment des pièces d'aspect.This type of sheet is used in various industries to make all kinds of parts including 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 type of sheet, continuous dipping coating installations are used in which a steel strip is immersed in a bath of molten metal, for example zinc, which may contain other chemical elements such as aluminum. , iron, and possible elements of addition such as lead, antimony, etc ... The temperature of the bath depends on the nature of the metal and in the case of zinc the temperature of the bath is of order of 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, during the running of the steel strip in the molten zinc bath, an Fe-Zn-Al intermetallic alloy is formed on the surface of said strip with a thickness of some ten 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 métallique est assurée par la couche d'alliage intermétallique cité précédemment.The corrosion resistance of the parts thus coated is ensured by the zinc, the thickness of which is most often produced by pneumatic wringing. The adhesion of the zinc on the metal strip is provided by the intermetallic alloy layer mentioned 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 passage of the steel strip in the bath of molten metal, this steel strip first circulates in a annealing furnace under a reducing atmosphere in order to recrystallize it after the important work hardening related to the rolling operation. cold, and prepare its chemical surface state to promote the chemical reactions necessary for the actual quenching operation. The steel strip is brought to about 650 to 900 ° C depending on the grade for the time required for recrystallization and surface preparation. It is then 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 passes through a sheath also called "bell drop" or "horn" under a protective atmosphere with respect to the steel and is immersed in the bath of molten metal.
L'extrémité 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 end of the sheath is immersed in the metal bath to determine, with the surface of said bath and inside this sheath, a liquid seal which is traversed by the steel strip during its scrolling in said sheath.
La bande d'acier est défléchie par un rouleau immergé dans le bain de métal et elle ressort de ce bain de 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 roll immersed in the metal bath and it emerges from the metal bath, then passes through the wiper means for regulating the thickness of the liquid metal coating on the steel strip.
Dans !e 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 composés intermétalliques ou 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 gasket inside the sheath is generally covered with zinc oxide, resulting from the reaction between the atmosphere inside this sheath and the zinc liquid seal and intermetallic or solid matte compounds 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, supersaturation in the zinc bath have a lower density than liquid zinc and go back to the surface of the bath and in particular to the surface of the liquid seal.
Le défilement de la bande d'acier à travers la surface du joint liquide provoque l'entraînement des particules stagnantes. Ces particules entraînées 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 movement of the steel strip through the surface of the liquid seal causes the entrainment of the stagnant particles. These particles caused by the movement of the liquid seal linked to the speed of the steel strip are not discharged into the volume of the bath and emerge in the extraction zone of the band by 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 traînées en sous épaisseur dans le zinc liquide d'une longueur de quelques millimètres à quelques centimètres.In fact, the intruded particles are retained by the pneumatic wringing jets before being ejected or disintegrated, thus creating sub-thick streaks in the liquid zinc of a length of a few millimeters to 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.In an attempt to eliminate the zinc particles and the matts on the surface of the liquid seal, various 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 disadvantages consists in cleaning the surface of the liquid seal by pumping zinc oxides and mattes 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 make it possible to clean the surface of the liquid seal only in a very local manner 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 traversed by the sealing strip. 'steel.
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 is to reduce the surface of the liquid seal at the point of passage of the steel strip by placing a plate of sheet metal or ceramic at this liquid seal to keep away from the band a portion of the particles present on the surface and get a self-cleaning of the liquid seal by this tape.
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 to remove all the particles present on the surface of the liquid seal and the self-cleaning is all the more important that the surface of the liquid seal is reduced, which is incompatible with the industrial conditions of exploitation.
De plus, au bout d'un temps de fonctionnement donné, le stockage des particules à l'extérieur de la plaque croît 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 of the particles outside the plate grows more and more and clusters of 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 on the surface of the liquid seal also forms a privileged place for trapping 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'entraînement des oxydes de zinc et des mattes par le défilement de la bande d'acier.This arrangement does not completely eliminate the defects related to the entrainment of zinc oxides and mattes by the scrolling 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.Indeed, the zinc vapors at the liquid seal will condense on the walls of the frame and the slightest swirl caused by the vibrations or the thermal folds of the strip to immersion, the walls of the frame will become dirty and thus become areas for storing 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 only work a few hours or even a day before becoming an additional source of defects.
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 processes the liquid seal and does not achieve a very low density of defects satisfying the requirements of customers wanting surfaces without appearance defects.
On connaît également une solution qui vise à l'obtention de la propreté du joint liquide par renouvellement du bain de métal fondu.There is also known a solution that aims to obtain cleanliness of the liquid seal by renewal of 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.Renewal is achieved by introducing liquid zinc pumped into the bath in the vicinity of 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 matts 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.Furthermore, the piping ensuring the renewal of liquid zinc can cause scratches on the steel strip before immersion and is itself a source of defects by accumulation of condensed zinc vapor above the liquid seal.
On connaît 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 boîte en acier inoxydable entourant la bande d'acier et débouchant à la surface du joint liquide. Une pompe aspire les particules entraînées par le déversement ainsi créé et les refoule dans le volume du bain.A process is also known which is based on the renewal of zinc at the liquid seal and wherein this renewal is carried out using a stainless steel box surrounding the steel strip and opening on the surface of the liquid seal . A pump sucks the particles entrained 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 boîte 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 in that the box surrounding the strip in the bath volume above the bottom roller can not be hermetically sealed.
L'invention a pour but de proposer une installation de galvanisation en continu d'une bande métallique qui permet 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 continuous galvanizing installation of a metal strip which makes it possible to avoid the drawbacks previously mentioned and achieve the very low density of defects satisfying the requirements of customers desiring surfaces without appearance defects.
A cet effet, l'invention a pour objet une installation de revêtement au trempé en continu d'une bande métallique selon la revendication 1.To this end, the subject of the invention is a continuous dipping coating installation of a metal strip according to
Selon d'autres caractéristiques de l'invention :
- l'élément déformable est formé par un soufflet en acier inoxydable,
- les moyens de positionnement comprennent deux organes d'actionnement reliés à la partie inférieure mobile de la gaine pour déplacer cette partie inférieure par pivotement autour d'un axe transversal à la bande et situé au niveau du soufflet et/ou par translation parallèlement à la surface du bain de métal liquide,
- les organes d'actionnement sont formés par des vérins hydrauliques ou pneumatiques.
- the deformable element is formed by a stainless steel bellows,
- the positioning means comprise two actuating members connected to the movable lower part of the sheath for moving this lower part by pivoting about an axis transverse to the band and located at the level of the bellows and / or by translation parallel to the surface of the bath of liquid metal,
- the actuating members are formed by hydraulic or pneumatic cylinders.
D'autres caractéristiques et avantages de l'invention apparaîtront 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,
- les Figs. 3 et 4 sont deux vues schématiques et à plus grande échelle des moyens de positionnement de la gaine de l'installation conforme à l'invention,
- les Figs. 5 et 6 sont deux vues schématiques montrant deux modes de réalisation des moyens de guidage de la bande à l'intérieur de la gaine de l'installation.
- FIG. 1 is a schematic elevational view of a continuous dipping coating plant,
- Figs. 3 and 4 are two schematic views and on a larger scale means for positioning the sheath of the installation according to the invention,
- Figs. 5 and 6 are two schematic views showing two embodiments of the guide means of the band inside the sheath of the installation.
Dans ce qui suit, la description sera faite pour une installation de galvanisation en continu d'une bande métallique. Mais, l'invention s'applique à tout procédé de trempage en continu dans lequel apparaît une pollution de surface et pour lequel il faut garder un joint liquide propre.In what follows, the description will be made for a continuous galvanizing installation of a metal strip. However, the invention applies to any continuous dipping process in which surface pollution appears and for which it is necessary to keep a clean liquid seal.
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 of all, at the outlet of the cold rolling mill, the
Dans ce four, la bande d'acier est portée à une température comprise par exemple entre 650 et 900°C.In this furnace, 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
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
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
Lors de cette immersion, il se forme à la surface de la bande d'acier 1 un alliage intermétallique Fe-Zn-Al réalisant un revêtement de zinc dont l'épaisseur est fonction du temps de séjour de la bande d'acier 1 dans le bain 12 de zinc liquide.During this immersion, an Fe-Zn-Al intermetallic alloy forming a zinc coating is formed on the surface of the
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
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
L'extrémité inférieure de la gaine 13a 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 end of the
Ainsi, la bande d'acier 1 à l'immersion dans le bain de zinc liquide 12, traverse la surface du joint liquide 14.Thus, the
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 dirigés vers chaque face de la bande d'acier 1 pour réguler l'épaisseur du revêtement de zinc liquide.The
Ainsi que représenté à la Fig. 1, l'extrémité 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 la gaine 13, un compartiment 21 de déversement du zinc liquide pour recueillir les particules d'oxydes de zinc et de composés intermétalliques qui surnagent à la surface du joint liquide 14.As shown in FIG. 1, the
Pour cela, l'arête supérieure 20a de la paroi interne 20 est positionnée au-dessous de la surface du joint liquide 14 et le compartiment 21 est muni de moyens, non représentés, 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 du zinc liquide de cette surface dudit joint 14 vers ce compartiment 21.For this, the
Par ailleurs, l'extrémité 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 22 dirigée vers la surface du joint liquide 14 et ménageant avec la gaine 13 un compartiment 23 étanche de stockage des particules d'oxyde de zinc.Furthermore, the
L'arête supérieure 22a de la paroi interne 22 est positionnée au-dessus de la surface du joint liquide 14.The
Dans ce cas, ce compartiment 23 sert de réceptacle des oxydes de zinc pouvant provenir de la paroi inférieure inclinée de la gaine et permet de stocker ces oxydes afin de protéger la bande d'acier 1.In this case, this
Selon une variante, l'arête supérieure 22a de la paroi interne 22 peut être positionnée au-dessous de la surface du joint liquide 14 et, dans ce cas, le compartiment 23 est un compartiment de déversement du zinc liquide, comme le compartiment 21.Alternatively, the
Pour que ce système fonctionne de manière optimisée, la bande d'acier 1 doit pénétrer dans le joint de zinc liquide 14 sans risquer de toucher les parois 20 et 22 des deux compartiments 21 et 23.For this system to function optimally, the
La ligne de passage de la bande d'acier 1 entre les parois 20 et 22 des deux compartiments 21 et 23 est déterminée par le diamètre du rouleau déflecteur 15 et par sa position.The line of passage of the
De plus, la modification de la position de l'extrémité inférieure 13a de la gaine 13 par rapport à la bande d'acier 1 intervient à chaque changement du rouleau 15.In addition, the modification of the position of the
Pour cela, la gaine 13 comporte deux parties, une partie supérieure fixe 30 et une partie inférieure mobile 31, reliées entre elles par un élément déformable 32 de façon à pouvoir modifier la position de la partie inférieure mobile 31 de la gaine 13. L'élément déformable 32 est constitué par un soufflet, par exemple en acier inoxydable et la partie inférieure 31 de la gaine 13 est associée à des moyens 35 de positionnement des parois internes 20 et 22 par rapport à la bande d'acier 1.For this, the
Selon l'invention comme représenté aux Figs. 3 et 4, les moyens 35 de positionnement comprennent deux organes d'actionnement, respectivement 35a et 35b, constitués par exemple par des vérins hydrauliques ou pneumatiques et reliés à la partie inférieure 31 de la gaine 13.According to the invention as shown in Figs. 3 and 4, the positioning means 35 comprise two actuating members, respectively 35a and 35b, constituted for example by hydraulic or pneumatic cylinders and connected to the
Ainsi, en agissant sur les deux vérins 35a et 35b, la partie inférieure mobile 31 de la gaine 13 est déplacée en translation parallèlement à la surface du bain de métal liquide 12 lorsque la course de déplacement des tiges d'actionnement desdits vérins est identique, comme représentée à la Fig. 3, Dans ce cas, la partie mobile inférieure 31 reste parallèle à elle-même.Thus, by acting on the two
Par ailleurs, en agissant sur les deux vérins 35a et 35b avec une course de déplacement différente pour chaque tige d'actionnement desdits vérins, la partie mobile inférieure 31 est déplacée par pivotement autour de l'axe virtuel transversal et en translation parallèlement à la surface du bain de métal liquide 12, ainsi que représenté à la Fig. 4.Furthermore, by acting on the two
Cette disposition a l'avantage dé permettre de régler indépendamment, d'une part, la position de la partie mobile 31 de la gaine 13 par rapport à la bande d'acier 1 et, d'autre part, l'horizontalité de ladite partie mobile. Cela permet également d'équilibrer le débit de métal liquide se déversant dans chaque compartiment 21 et 23 et de ce fait d'augmenter l'efficacité de l'installation.This arrangement has the advantage of making it possible to adjust independently, on the one hand, the position of the
En déplaçant la partie inférieure mobile 31 de la gaine 13 par pivotement et/ou par translation, la position des parois internes 20 et 22 des compartiments 21 et 23 est ajustée pour que la bande d'acier 1 pénètre dans le joint de zinc liquide 14 déterminé par lesdites parois internes 20 et 22 sans risquer de toucher ces parois.By moving the movable
Ainsi que représenté sur les Figs. 5 et 6, l'installation comporte des moyens 40 de guidage de la bande d'acier 1 à l'intérieur de la gaine 13.As shown in Figs. 5 and 6, the installation comprises means 40 for guiding the
Ces moyens 40 de guidage sont formés par un rouleau déflecteur 41 ou 42 placé dans la gaine 13 pour dresser la ligne de passage de la bande d'acier 1 par rapport au rouleau 15 et régler plus aisément le passage de ladite bande d'acier 1 entre les deux parois 20 et 22 des compartiments 21 et 23.These guide means 40 are formed by a
Dans le cas d'une bande d'acier de faible épaisseur, le rouleau déflecteur 41 est disposé sur la face de la bande 1 opposée à celle en contact avec le rouleau 15, comme représenté à la Fig. 5, et dans le cas d'une bande d'acier 1 de plus forte épaisseur, le rouleau déflecteur 42 est disposé sur la face de la bande 1 en contact avec le rouleau d'entraînement 15, comme représenté à la Fig. 6.In the case of a thin steel strip, the
Dans ce cas, le rouleau déflecteur 42 permet de compenser le cintrage de la bande d'acier 1 dans le sens transversal qui est lié au gradient de déformation des fibres de la bande d'acier, dans son épaisseur, sur les rouleaux du four en amont de la cuve de galvanisation.In this case, the
L'invention s'applique à tout revêtement métallique par trempé.The invention applies to any metal coating by dipping.
Claims (7)
- Installation for continuously dip coating a metal strip (1), of the type comprising:- a vessel (11) which contains a bath (12) of liquid metal,- a sheath (13) which is for the metal strip (1) to move in a protective atmosphere and whose lower end (13a) is immersed in the bath (12) of liquid metal in order to define, with the surface of the bath (12) and inside this sheath (13), a liquid metal seal (14),- a roller (15) for redirecting the metal strip (1), which roller (15) is arranged in the metal bath (12), and- means (16) for drying the coated metal strip (1), at the outlet from the metal bath (12),characterised in that the sheath (13) is continued, at the lower portion (13a) thereof, by at least two internal walls (20; 22) which are each located at a side of the strip (1) and which are directed towards the surface of the metal in the bath (12) in the sheath (13) in order to form at least two compartments (21; 23) for recovering particles of metal oxides and intermetallic compounds, and in that this sheath (13) comprises a fixed upper portion (30) and a movable lower portion (31) which are connected to each other by means of a deformable element (32) and means (35) for positioning the movable lower portion (31) of the sheath (13) relative to the metal strip (1) comprising two activation elements (35a, 35b) which are connected to the lower portion (31) in order to displace it by means of translation parallel with the surface of liquid metal in the bath (12).
- Installation according to claim 1, characterised in that the two activation elements (35a, 35b) also move the lower portion (31) of the sheath (13) by means of pivoting about an axis which is transverse relative to the strip (1) and which is located in the region of the deformable element (32).
- Installation according to claim 1 or 2, characterised in that the deformable element is formed by a bellows (32), for example, of stainless steel.
- Installation according to any one of claims 1 to 3, characterised in that the activation elements (35a; 35b) are formed by hydraulic or pneumatic jacks.
- Installation according to any one of the preceding claims, characterised in that it comprises means (40) for guiding the metal strip (1) inside the sheath (13).
- Installation according to claim 5, characterised in that the guiding means (40) are formed by a redirecting roller (41) which is arranged on the opposite face of the strip 1 to the one in contact with the redirecting roller (15).
- Installation according to claim 5, characterised in that the guiding means (40) are formed by a redirecting roller (42) which is arranged on the face of the strip (1) in contact with the redirecting roller (15).
Applications Claiming Priority (3)
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FR0014482 | 2000-11-10 | ||
FR0014482A FR2816637B1 (en) | 2000-11-10 | 2000-11-10 | INSTALLATION FOR THE TEMPER COATING OF A METAL STRIP |
PCT/FR2001/003454 WO2002038823A1 (en) | 2000-11-10 | 2001-11-07 | Installation for dip coating of a metal strip |
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EP1337681A1 EP1337681A1 (en) | 2003-08-27 |
EP1337681B1 true EP1337681B1 (en) | 2008-01-02 |
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EP01993714A Expired - Lifetime EP1337681B1 (en) | 2000-11-10 | 2001-11-07 | Installation for dip coating of a metal strip |
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EP (1) | EP1337681B1 (en) |
JP (1) | JP3779272B2 (en) |
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FR (1) | FR2816637B1 (en) |
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MA (1) | MA25854A1 (en) |
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JPS63219559A (en) * | 1987-03-09 | 1988-09-13 | Kubota Ltd | Device for removing dross |
JPH01188656A (en) * | 1988-01-22 | 1989-07-27 | Nisshin Steel Co Ltd | Snout in continuous hot-dipping device |
JPH0211742A (en) * | 1988-06-29 | 1990-01-16 | Kawasaki Steel Corp | Device for removing dross in snout for continuous molten metal plating |
JPH0313414A (en) * | 1989-06-12 | 1991-01-22 | Houriyou Sangyo Kk | Roller for belt conveyor |
JPH03134146A (en) * | 1989-10-17 | 1991-06-07 | Nippon Steel Corp | Continuous hot dip metal plating method |
US5069158A (en) * | 1990-03-27 | 1991-12-03 | Italimpianti Of America, Inc. | Hydrostatic bearing support of strip |
JPH04120258A (en) * | 1990-09-12 | 1992-04-21 | Kawasaki Steel Corp | Method and device for continuous hot dip galvanizing |
JPH0579827A (en) | 1991-09-25 | 1993-03-30 | Nec Corp | Preparing system for cad data on component shape |
JPH05279827A (en) * | 1992-03-31 | 1993-10-26 | Kawasaki Steel Corp | Device for removing dross in snout in hot-dip metal coating |
JP2965882B2 (en) * | 1995-02-06 | 1999-10-18 | 川崎製鉄株式会社 | Snout equipment |
KR100244646B1 (en) | 1995-12-30 | 2000-03-02 | 이구택 | The exchange cycle extension apparatus for sink roll of zn bath |
-
2000
- 2000-11-10 FR FR0014482A patent/FR2816637B1/en not_active Expired - Fee Related
-
2001
- 2001-01-03 BR BRPI0100007-1A patent/BR0100007B1/en not_active IP Right Cessation
- 2001-07-11 UA UA2003065329A patent/UA74225C2/en unknown
- 2001-11-07 AU AU2377602A patent/AU2377602A/en active Pending
- 2001-11-07 HU HU0303550A patent/HUP0303550A2/en unknown
- 2001-11-07 US US10/415,517 patent/US6923864B2/en not_active Expired - Lifetime
- 2001-11-07 PT PT01993714T patent/PT1337681E/en unknown
- 2001-11-07 EE EEP200300210A patent/EE04821B1/en unknown
- 2001-11-07 ME MEP-2009-154A patent/ME00793B/en unknown
- 2001-11-07 MX MXPA03004075A patent/MXPA03004075A/en active IP Right Grant
- 2001-11-07 ES ES01993714T patent/ES2296830T3/en not_active Expired - Lifetime
- 2001-11-07 CZ CZ20031292A patent/CZ298884B6/en not_active IP Right Cessation
- 2001-11-07 CA CA002428486A patent/CA2428486C/en not_active Expired - Lifetime
- 2001-11-07 WO PCT/FR2001/003454 patent/WO2002038823A1/en active IP Right Grant
- 2001-11-07 EA EA200300551A patent/EA004334B1/en not_active IP Right Cessation
- 2001-11-07 KR KR1020037006206A patent/KR101144757B1/en active IP Right Grant
- 2001-11-07 CN CNB018186068A patent/CN1220787C/en not_active Expired - Fee Related
- 2001-11-07 JP JP2002541135A patent/JP3779272B2/en not_active Expired - Fee Related
- 2001-11-07 AT AT01993714T patent/ATE382719T1/en active
- 2001-11-07 AU AU2002223776A patent/AU2002223776B2/en not_active Ceased
- 2001-11-07 SK SK510-2003A patent/SK286934B6/en not_active IP Right Cessation
- 2001-11-07 DK DK01993714T patent/DK1337681T5/en active
- 2001-11-07 DE DE60132240T patent/DE60132240T2/en not_active Expired - Lifetime
- 2001-11-07 PL PL362471A patent/PL201515B1/en unknown
- 2001-11-07 EP EP01993714A patent/EP1337681B1/en not_active Expired - Lifetime
- 2001-11-09 TW TW090127931A patent/TW554072B/en not_active IP Right Cessation
- 2001-11-09 AR ARP010105245A patent/AR034182A1/en active IP Right Grant
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2003
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- 2003-05-07 BG BG107777A patent/BG65317B1/en unknown
- 2003-05-07 ZA ZA200303501A patent/ZA200303501B/en unknown
- 2003-05-08 HR HR20030364A patent/HRP20030364B1/en not_active IP Right Cessation
- 2003-05-08 EC EC2003004592A patent/ECSP034592A/en unknown
- 2003-05-09 NO NO20032088A patent/NO20032088L/en not_active Application Discontinuation
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