EP2954085A1 - Procédé et dispositif de revêtement d'une bande métallique par immersion à chaud - Google Patents

Procédé et dispositif de revêtement d'une bande métallique par immersion à chaud

Info

Publication number
EP2954085A1
EP2954085A1 EP14705302.9A EP14705302A EP2954085A1 EP 2954085 A1 EP2954085 A1 EP 2954085A1 EP 14705302 A EP14705302 A EP 14705302A EP 2954085 A1 EP2954085 A1 EP 2954085A1
Authority
EP
European Patent Office
Prior art keywords
trunk
metal strip
extension piece
molten bath
piece
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
EP14705302.9A
Other languages
German (de)
English (en)
Other versions
EP2954085B1 (fr
Inventor
Jegor Bergen
Frank Spelleken
Michael Peters
Manuela Ruthenberg
Friedhelm Macherey
Florian Spelz
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP2954085A1 publication Critical patent/EP2954085A1/fr
Application granted granted Critical
Publication of EP2954085B1 publication Critical patent/EP2954085B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • C23C2/34—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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • 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
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—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
    • C23C2/12—Aluminium 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
    • C23C2/34—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
    • C23C2/38—Wires; Tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B05C3/125—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length the work being a web, band, strip or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/19—Wire and cord immersion

Definitions

  • the invention relates to a device for hot dip coating of
  • Metal band preferably steel band, with a Schmelzbadgefäß, an im
  • Molten bath opening trunk for introducing a heated in a continuous furnace metal strip in the molten bath and arranged in the molten bath deflection roller for deflecting the entering into the molten bath
  • Such a device is known for example from EP 0 650 534 Bl.
  • Devices or systems of this type are also referred to as fire-coating systems. They are characterized by a continuous mode of operation.
  • oxides and slag accumulate on the surface of the molten metal within the trunk, which can lead to defects in the coating of the metal strip.
  • the slag is dragged off the belt, resulting, for example, in spots of poor adhesion due to alloy layer disturbances and slag inclusions, as well as defects (uncoated spots) in the coating.
  • the present invention has for its object to improve a device of the type mentioned in that slag-conditioned
  • the device according to the invention comprises a molten bath vessel, a proboscis emptying therein for introducing a heated in a continuous furnace
  • the device is characterized in that the trunk is provided with a shaft-shaped trunk extension piece for enlarging the trunk immersion depth, the inner width of the trunk extension piece tapering towards the outlet opening thereof over at least a partial length thereof.
  • the snout extension piece according to the invention may be a separately manufactured component, which is attached to the lower end of the snout while leaving at least one
  • Feed opening is recognized. But it can also be integrally formed with the trunk or liquid-tight connected to the lower end of the trunk.
  • the inside width of the shaft-shaped trunk extension corresponds to
  • the clear inner height preferably the clear vertical inner height, or the inner diameter of the trunk extender piece.
  • the inside width of the snout extender piece is measured transversely, for example perpendicularly, to the plane of the metal band portion passing through the snout extender piece.
  • this flow is not or not significantly influenced by the trunk, which has a substantially constant inside or inside height there.
  • the vortex flow occurring on the metal strip is increased by the extension of the trunk or the enlargement of the immersion depth of the trunk.
  • the flow of the melt within the trunk due to the Bernoulli effect is intensified by the tapering of the inner width or inner clear height of the trunk extension piece towards its outlet opening.
  • the intensified within the trunk flow is characterized by relatively high turbulence, which cause an increased flow rate at the molten bath and a better mixing / homogenization of the melt and thus prevent slag formation or slag accumulation at Schmelzbadador within the trunk as much as possible. In this way, slag-conditioned surface defects on the surface of the coated metal strip can be avoided.
  • An advantageous embodiment of the device according to the invention provides that the inner width or clear inner height of the trunk extension piece tapers towards its outlet opening, at least over a partial length thereof.
  • the inner width or inner height of the trunk elongation piece may also be stepped in the form of one or more of its length at least over a partial length thereof
  • a further preferred embodiment of the device according to the invention provides that the outlet opening or narrowest point of the
  • Snout extender a clear inner width of max. 120 mm
  • Potroll should be respected, since otherwise a dynamic pressure can be established between the trunk and the control roller, which impairs the flow at the outlet opening of the trunk or the trunk, thereby possibly preventing sufficient vortex formation in the trunk.
  • Reed extension piece opposite the lateral surface of the guide roller at a distance in the range of 100 mm to 400 mm, preferably 100 mm to 300 mm ends.
  • the length of the trunk extension piece should be such that when
  • the immersion depth is at least 400 mm.
  • the length of the trunk extension piece is dimensioned such that in the case of hot dip coating of the metal strip, the trunk immersion depth is at least 500 mm, particularly preferably at least 600 mm.
  • Connecting portion into which projects the lower end of the spout, wherein the connecting portion and the trunk at least one supply channel for the separate addition of coating material or at least one alloying additive in the Defining the trunk and / or the trunk extension piece.
  • melt compositions to adjust certain desired alloy layer properties. By adding a specific coating or alloy material directly into the proboscis acting as a lock, it is possible, the melt composition in the lock (proboscis) of the
  • Decoate melt composition in the remaining part of the molten bath vessel is possible, for example, to operate the molten bath vessel with a substantially pure aluminum melt and to enrich the melt in the lock (trunk) with silicon so that a relatively thin alloy layer is first obtained on the metal strip to be coated.
  • the metal strip subsequently coated with pure aluminum as cover coating is then sufficiently ductile by the thin alloy layer in order to be able to realize desired forming processes. Due to the top layer of pure aluminum, the product also has excellent anti-corrosion properties.
  • a further advantageous embodiment of the device according to the invention is characterized in that the Gansselverinrungs vinegar is provided with at least one separate channel, by the negative pressure in the trunk or when the molten metal surface (Schmelzbadober Structure) in the trunk against the molten metal surface (Schmelzbadober Design) outside the trunk Molten metal from the Schmelzbadgefäß can flow in the direction of the molten metal surface in the trunk.
  • the one or more separate channels can be arranged for this purpose, for example, on the outside of the trunk extension piece. Your inlets should be placed sufficiently deep in the molten bath. Preferably, they open at the lower end of the trunk extension piece.
  • connection section of the trunk elongation piece and the separate addition of coating material or an alloying additive it is advantageous if, according to a further embodiment of the device according to the invention, the at least one separate channel has an end section which is above a bottom of the connection section in one Throat area of the same opens.
  • the bottom of the connection section of the trunk extension piece is basically covered with sufficient molten metal.
  • a relatively large distance between the mouth opening (outlet opening) of the separate channel and the inlet opening of the trunk extension piece is expedient with regard to the separate addition of coating material or an alloying additive into the sluice defined by the trunk so that the sluice flowing from the meltblown vessel via the separate channel into the upper area of the sluice Molten metal with the separately added into the lock
  • Coating material or alloy additive can mix as homogeneously as possible and thus a correspondingly homogeneous coating of the metal strip is achieved.
  • Fig. 1 is a vertical sectional view of a Schmelzbadgefäßes with a
  • FIG. 10 is a cross-sectional view of a portion of a metal strip coated by dipping into two different metallic melts;
  • FIGS. 11 to 13 show a further exemplary embodiment of a trunk elongation piece in a perspective illustration, in a front view and in FIG
  • FIG. 14 is a vertical sectional view of the snout extender along the
  • Fig. 3 is a section of a conventional plant for hot dip coating of metal strip, in particular steel strip outlined.
  • the metal strip 1 is protected from corrosion.
  • the metal strip 1 is first cleaned in a continuous furnace 2 and annealed recrystallizing. Subsequently, the strip 1 is melt-dipped by being passed through a molten metal bath 3.
  • the coating metal for the band for example, zinc, zinc alloys, aluminum and
  • the molten bath vessel 4 is electrically heated.
  • the molten bath vessel 4 is electrically heated.
  • the metal layer is formed, whose composition corresponds to the chemical analysis of the
  • Melt bath vessel 4 located molten metal corresponds.
  • the layer thickness of the metal layer serving as corrosion protection is usually adjusted by means of stripping nozzles 5.
  • the continuous furnace 2 typically comprises a directly heated preheater (not shown) and indirectly heated reduction and holding zones (not shown) and subsequent cooling zones. At the end of the cooling zone, the furnace 2 is connected to the molten bath 3 via a lock (trunk) 6. In the indirect heated furnace part and in the cooling zones, a reducing atmosphere of nitrogen and hydrogen is set. The steel strip 1 is annealed recrystallizing in the furnace 2, so that the steel work-hardened during rolling obtains the required technological properties after the passage. In addition, by the hydrogen on part in the
  • Melt bath 3 corresponding temperature in the same one.
  • An arranged in the molten bath deflection roller 7 causes the deflection of the entering from the trunk 6 in the molten bath steel strip 1 in a preferably vertical direction.
  • At least one stabilizing roller 8 and, if appropriate, a pressure roller (pass line roller) 9 ensure a smooth, vibration-free passage of the belt 1 through the wide flat nozzles 5 of the nozzle wiper device, which are arranged above the molten bath.
  • the strip 1 Upon exiting the molten bath 3, the strip 1 entrains a quantity of coating material dependent on the strip speed from the molten bath.
  • the resulting layer thickness of the metal overlay is considerably higher than the desired layer thickness.
  • the excess coating metal is stripped off the flat nozzles 5 by means of directed air or gas jets, so that the desired metal coating layer thickness remains on the belt 1.
  • oxide deposits or slag 10 collect on the surface of the melt 3 within the trunk 6, which leads to defects in the alloy layer or in the coating of the coating
  • Metal strip 1 can lead. To avoid slag-related
  • Coating defects are proposed by the invention to increase the immersion depth of the trench 6 and to taper the inside width of the dipped trunk extension piece 6.1 towards its outlet opening at least over a partial length thereof.
  • the inventive extension of the trunk 6 can in different
  • the trunk 6 of a generic coating installation is essentially that of FIG Coating plant according to FIG. 3 may correspond or corresponds to a shaft-shaped trunk extension piece 6.1 for enlarging the
  • the snout extender 6.1 has a
  • the connecting section 6.11 has a basin-shaped or trough-shaped receiving space 6.12, whose peripheral side wall is fastened to a carrier 6.13 mounted on the upper edge of the melting bath vessel 4. In the ground 6.25 of the
  • Connection section 6.11 or receiving space 6.12 is an elongated opening 6.14 formed by the metal strip to be coated 1 runs in the shaft-shaped trunk extension piece 6.1.
  • Proboscis extender 6.1 tapers towards its outlet opening 6.15.
  • the tapering of the inner width results from the fact that the walls 6.16, 6.17 of the trunk extension piece 6.1 which face the upper side and lower side of the band 1 converge in the direction of the exit opening 6.15.
  • Proboscis extender 6.1 is thus characterized in this embodiment by a continuous taper.
  • the outlet opening 6.15 or narrowest point of the trunk extender 6.1 preferably has a clear inner width W of a maximum of 120 mm, more preferably a maximum of 100 mm (see Fig. 4). Furthermore, the trunk extension piece 6.1 is dimensioned such that it ends opposite to the lateral surface of the deflection roller 7 at a distance A in the range of 100 mm to 400 mm, preferably 100 mm to 300 mm.
  • Drill extender 6.1 from the lateral surface of the guide roller 7 about 200 mm.
  • the deflection roller 7 is associated with a stabilizing roller 8 in order to plan a flat, vibration-free passage of the belt 1 through the flat nozzles 5 of the nozzle scraping device arranged above the molten bath
  • the support arms of the guide roller 7 and the stabilizing roller 8 are designated in Fig. 1 with 7.1 and 8.1. Furthermore, the stabilizing roller 8 with a likewise immersed arranged guide or pinch roller 9 may be combined (see Fig. 2).
  • connection section 6.11 of the trunk extension piece 6.1 and the trunk 6 at least one supply channel 6.18, via which in the submerged portion of the trunk 6 and / or in the
  • Reed extension piece 6.1 Coating material B and / or at least one alloying additive LZ can be added separately.
  • the trunk extension piece 6.1 has no trough-shaped or basin-shaped connection section.
  • the snout extender 6.1 is attached directly to the end of the snout 6, i. between the submerged end of the trunk 6 and the trunk extension piece 6.1 no supply gap or channel is provided.
  • the trunk extender 6.1 is composed of several of the top and bottom of the band 1 facing walls or wall sections 6.19, 6.20, 6.21, 6.22. While the upper walls / wall sections 6.19, 6.20 are substantially parallel to each other, the lower walls / wall sections 6.21, 6.22 are upper
  • Proboscis extender 6.1 thus extends in this embodiment over a partial length of the trunk extender.
  • FIGS. 6 and 7 the velocity distribution is shown in FIGS. 6 and 7.
  • Tradorelverinrung 6.1 the flow in the trunk 6, in particular in the area enclosed by the trunk 6 area 3.1 of the Schmelzbadspiegels is intensified, resulting in a continuous exchange of melt on the molten surface in the trunk 6 causes.
  • the trunk extension according to the invention also offers the possibility in the
  • Melt bath 3 to provide areas of different melt compositions to set certain desired alloy layer properties. This will be explained in more detail below with reference to FIGS. 8 to 10.
  • a relatively thin alloy layer 11 is formed at the steel-coating metal interface.
  • the thickness of the alloy layer 11 is for example about 4 ⁇ .
  • On the alloy layer 11 follows the overlying cover layer 12 of aluminum and embedded
  • FIG. 9 shows a section of a steel strip 1 coated by dipping in a pure aluminum melt in cross-section. This cover provides one
  • the top layer is made of pure aluminum. Due to the lack of silicon in the melt is formed
  • Interface steel coating metal a relatively thick alloy layer 11 '.
  • the thickness of the brittle alloy layer 11 ' may be up to 20 ⁇ in this case, for example.
  • the trunk 6 can be added via the basin-shaped connection section 6.11 of the trunk extension piece 6.1 and the supply channel 6.18 to an AlFeSi coating material.
  • a pure aluminum melt is used, so that a cover layer 12 'of pure aluminum is obtained.
  • FAL Type 3 combines the advantages of the FAL Type 1 and FAL Type 2 products. This gives a product which is sufficiently ductile due to the thin alloy layer 11 in order to be able to realize desired larger transformations and which moreover through the cover layer 12 '
  • FIGS. 11 to 14 show a further exemplary embodiment of a snout extension piece according to the invention.
  • the snout extender piece 6.1 has a connection section 6.11, into which the lower end of the snout protrudes.
  • the connecting section 6.11 defines a basin-shaped or trough-shaped receiving space 6.12, whose peripheral side wall is fastened to a carrier 6.13 mounted on the upper edge of the melting bath vessel.
  • an elongated opening 6.14 is formed through which runs the metal strip to be coated in the shaft-shaped trunk extension piece 6.1.
  • the inner width (inner clear height) W of the trunk extension piece 6.1 tapers to its outlet opening 6.15 out.
  • the tapering of the inner width W results from the fact that the walls 6.16, 6.17 of the trunk elongation piece 6.1 which face the upper side and underside of the band 1 converge in the direction of the outlet opening 6.15.
  • the front wall 6.16 includes with the bottom 6.25 an acute angle, which is for example about 65 °.
  • the rear wall 6.17 encloses with the bottom 6.25 an acute angle, which is for example about 60 ° (see Fig. 14].
  • the outlet opening 6.15 or narrowest point of the trunk extension piece 6.1 has a clear inner width W of, for example, less than 130 mm, preferably not more than 120 mm, particularly preferably not more than 100 mm. Furthermore, that is
  • Grooving extension 6.1 so dimensioned that in the hot dip coating of the metal strip, the Rute immersion depth is at least 400 mm, preferably at least 500 mm, more preferably at least 600 mm.
  • the trunk extender piece 6.1 is provided with separate channels 6.23, 6.24, through which metal melt can flow out of the melt bath vessel 4 in the direction of the molten bath level in the trunk or in the receiving space 6.12 when the melt level in the trunk drops from the melt level (melt pool mirror).
  • the separate channels 6.23, 6.24 are preferably arranged on the outside of the front wall 6.16 of the trunk extension piece 6.1.
  • the respective channel 6.23, 6.24 may consist of a tube or be formed from a U-profile, the legs of which are connected to the wall of the trunk extension piece 6.1, for example, welded.
  • corresponding channels may be arranged on the outside of the rear wall 6.17 and / or on the narrower side walls of the trunk extension piece 6.1.
  • the channels 6.23, 6.24 open above the bottom 6.25 of the connection section 6.11.
  • the upper end portions 6.231, 6.241 of the channels 6.23, 6.24 are for this purpose arranged on the outside of the front wall of the connecting portion 6.11, which in the operation of the
  • the upper end sections 6.231, 6.241 of the channels 6.23, 6.24 merge into channel sections which are arranged on the underside of the bottom 6.25 (see Fig. 14) .
  • the upper outlet openings of the channels 6.23, 6.24 are thus located above the bottom 6.25 in a throat region defined by the bottom 6.25 and the front wall of the terminal section 6.11.

Landscapes

  • 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)

Abstract

L'invention concerne un dispositif de revêtement d'une bande métallique par immersion à chaud, qui comprend une cuve (4) de bain de fusion, un museau (6) débouchant dans la cuve (4) de bain de fusion et servant à introduire dans le bain de fusion une bande métallique (1) chauffée dans un four continu, ainsi qu'un galet de renvoi (7) disposé dans la cuve de bain de fusion et servant à renvoyer la bande métallique (1) entrant dans le bain de fusion dans une direction opposée audit bain de fusion. Selon l'invention, le museau (6) est muni d'une pièce formant prolongateur (6.1) en forme de trémie et servant à augmenter la profondeur d'immersion du museau, le diamètre intérieur de la pièce qui forme prolongateur (6.1) du museau s'amenuisant en direction de son ouverture de décharge (6.15) sur une partie de sa longueur. Ces mesures permettent d'augmenter ou de porter à un maximum l'écoulement tourbillonnant dans la matière fondue au niveau ou à proximité de la bande métallique (1) et par conséquent d'obtenir une meilleure homogénéisation de la matière fondue dans la zone de la bande, avec pour effet de permettre d'éviter la formation de défauts de surface dus aux scories à la surface de la bande métallique (1) revêtue.
EP14705302.9A 2013-02-05 2014-02-04 Dispositif de revêtement d'une bande métallique par immersion à chaud Active EP2954085B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013101131.4A DE102013101131A1 (de) 2013-02-05 2013-02-05 Vorrichtung zum Schmelztauchbeschichten von Metallband
PCT/EP2014/052148 WO2014122128A1 (fr) 2013-02-05 2014-02-04 Procédé et dispositif de revêtement d'une bande métallique par immersion à chaud

Publications (2)

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EP2954085A1 true EP2954085A1 (fr) 2015-12-16
EP2954085B1 EP2954085B1 (fr) 2019-01-02

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EP14705302.9A Active EP2954085B1 (fr) 2013-02-05 2014-02-04 Dispositif de revêtement d'une bande métallique par immersion à chaud

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US (1) US9453275B2 (fr)
EP (1) EP2954085B1 (fr)
DE (1) DE102013101131A1 (fr)
ES (1) ES2715857T3 (fr)
WO (1) WO2014122128A1 (fr)

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Also Published As

Publication number Publication date
WO2014122128A9 (fr) 2015-09-24
US9453275B2 (en) 2016-09-27
DE102013101131A1 (de) 2014-08-07
ES2715857T3 (es) 2019-06-06
EP2954085B1 (fr) 2019-01-02
US20150368776A1 (en) 2015-12-24
WO2014122128A1 (fr) 2014-08-14

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