EP3126539B1 - Anlage und verfahren zum beizen und zur metallbeschichtung eines metallbandes - Google Patents

Anlage und verfahren zum beizen und zur metallbeschichtung eines metallbandes Download PDF

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Publication number
EP3126539B1
EP3126539B1 EP15703485.1A EP15703485A EP3126539B1 EP 3126539 B1 EP3126539 B1 EP 3126539B1 EP 15703485 A EP15703485 A EP 15703485A EP 3126539 B1 EP3126539 B1 EP 3126539B1
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EP
European Patent Office
Prior art keywords
strip
temperature
pickling
furnace
stage
Prior art date
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Revoked
Application number
EP15703485.1A
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English (en)
French (fr)
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EP3126539A1 (de
Inventor
Alain Challaye
Sébastien MAILLARD
Philippe Podda
Jean-Pierre Robinet
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Clecim SAS
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Primetals Technologies Austria GmbH
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Priority claimed from EP14290086.9A external-priority patent/EP2927343A1/de
Application filed by Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Priority to PL15703485T priority Critical patent/PL3126539T3/pl
Publication of EP3126539A1 publication Critical patent/EP3126539A1/de
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling

Definitions

  • the present invention relates to an installation for stripping and metallic coating of a metal strip according to the preamble of claim 1 and an associated process according to the preamble of claim 12.
  • hot steel rolling lines have made it possible to provide metal strips with a thickness generally greater than about 1.2 mm.
  • These lines conventionally require the association of continuous casting delivering products with a thickness of around 200 to 250 mm, requiring the use of a set of hot rolling mill stands to obtain a strong reduction in thickness. in particular when it is desired to achieve minimum thicknesses of around 1mm.
  • the energy balance and the sizing of such installations to achieve this result are relatively heavy.
  • new continuous hot metal casting processes of the so-called ESP ("Endless Strip Production”) type make it possible to obtain, with the help of a smaller set of hot rolling mill stands, metal strips of steel of high quality. minimum thickness around 0.7 mm to date.
  • the strips obtained by the "hot” processes described above would have to be further pickled, then finally galvanized.
  • the output thickness of the strips produced would then be at least generally greater than 1.2 mm with conventional hot processing methods.
  • coated metal strips for example galvanized thinner and also with good stamping properties, it is necessary to cold roll these strips with a large reduction in thickness.
  • Cold rolling thus induces strain hardening of the steel, compared to a low original level of said strain hardening, it nevertheless offers the advantage of participating in obtaining good final drawing properties, but requires, downstream of the 'rolling operation, annealing the rolled metal strip, before galvanizing, in order to make it possible to obtain, in particular, the good final stamping properties.
  • An example of a galvanizing line for cold rolled, annealed and then galvanized incoming strips is described by US4436292A .
  • An aim of the present invention is therefore to provide a solution to widen a range of thicknesses of products leaving a continuous metal coating process supplied by default with a non-pickled steel strip running, from of coils produced by a hot process.
  • the proposed solution must also ensure that the strip entering the coating unit has a minimum rate of strain hardening, even if a reduction in strip thickness to widen said range is carried out.
  • this solution should make it possible to dispense with a step of high thickness reduction by cold rolling involving a step of annealing the strip (recrystallization), while nevertheless making it possible to maintain good stamping qualities of the product. final.
  • the present invention should make it possible to ensure a continuous combined process of steps combining pickling, reduction in thickness, improvement in roughness and flatness, maintenance of the optimum properties of the material after reduction in thickness, and deposition of the metallic coating.
  • the metallic coating is mainly a galvanization on the strip such as for example by a hot dipped process in a bath of liquid metal comprising various types of metal alloys for galvanic protection of the steel, followed by associated treatments to ensure the quality. market for coated products. It is also possible to provide any other metal coating process, such as galvanization in an appropriate electrolytic bath.
  • a pickling and metal coating installation such as galvanizing a continuously moving metal strip, comprising successively depending on the movement at least one pickling unit, an oven, a coating unit (such as a bath of liquid metal as a coating agent or an electrolytic bath), and for which the metal strip entering the stripping unit is by default a hot rolled product,
  • a coating unit such as a bath of liquid metal as a coating agent or an electrolytic bath
  • the furnace generally under an atmosphere non-oxidizing requires a single restoration of strip under a plateau of lower temperatures (between 300 ° C and 700 ° C for less than two minutes) after the strip has undergone a slight reduction in thickness in the rolling mill with limited elongation / reduction.
  • the installation Advantageously allows a balancing between the effects of (limited) thickness reduction over a wider range and the guarantee of a possible strip restoration control in order to guarantee high stamping qualities of the outgoing strip (minimized hardening effect by restoration).
  • the reduction limited by a rolling mill with limited elongation / reduction makes it possible to ensure a roughness and a flatness adapted to a better wettability necessary for the coating downstream and a better dewatering downstream.
  • a cleaning unit installed downstream of the skin pass will also allow any emulsions / detergents or other alkaline products to be evacuated, as well as dust (fine iron) and other metal debris possibly generated by the action of the extension rolling mill / limited reduction, in order to improve the quality of the coating.
  • the limited elongation / reduction rolling mill only performs a low elongation (or reduction of thickness) and nevertheless makes it possible to obtain a galvanized strip having in particular excellent stamping properties.
  • the invention proposes a method of stripping and metallic coating of a moving metal strip. continuous, comprising successively according to the scrolling at least one step pickling (2), a heat treatment step in strip temperature control (4), a coating step such as galvanization (5) (such as by dipping in a bath of liquid metal or in an electrolytic bath) , and for which the metal strip upstream of the pickling step is by default a hot rolled product,
  • a post-coating step is also provided for possible simple or combined operations by means of an additional skin-pass and a tensile leveler, said operation being followed by an additional coating step (such as a passivation step. ).
  • a set of sub-claims also presents advantages of the invention.
  • an inlet section (1) allows the introduction of the strip into said unit by means of two unwinders (1a, 1b) successively unwinding the coils towards a strip shear and a welder (11) in order to weld the heads and tails of two successive bands, as well as an accumulator (not shown) to adapt the web running speed during welding, then for the introduction of the welded bands into the stripping unit (2).
  • a descaling means (“oxide breaker”) is also arranged before the strip enters the stripping unit (2).
  • the pickling unit (2) can comprise successively juxtaposed acid baths, as well as rinsing and drying means. It may alternatively comprise a system for spraying the product with a stripping compound such as by means of an abrasive solid material and, if necessary, a liquid.
  • a stripping compound such as by means of an abrasive solid material and, if necessary, a liquid.
  • the abrasive solid material comprises for example solid particles and / or grains and the liquid, if necessary, comprises at least water.
  • the metal strip entering the pickling unit is by default a hot-rolled product, having a minimum thickness of a few tenths of a millimeter.
  • the metal strip upstream of the pickling unit could also be a cold rolled product replacing the hot rolled product, in which case the strip is not pickled in the pickling unit (or deflected from the unit. stripping to the limited elongation / reduction rolling mill) and the furnace provides additional heating and cooling means to ensure strip annealing.
  • This alternative is however not further described in the context of the invention, because even if it has flexibility of switching between bands "to hot ”or“ cold ”to be coated on the surface for example to galvanize them, it requires either that the furnace allows an annealing again, or that it is accepted to keep high values of hardness due to work hardening by rolling at cold.
  • the installation according to the invention provides that the limited elongation / reduction rolling mill (3) disposed at the outlet of the pickling unit (2) allows a thickness reduction factor of 0.1% to at least 30%.
  • the output of the limited elongation / reduction rolling mill is coupled to a strip cleaning unit (31) comprising at least one of the cleaning means among a degreasing (if the reduction rate greater than about 10% which would require the use of emulsion of the oil-water type during rolling in a rolling mill with limited elongation / reduction), brushing, watering, wringing, drying.
  • the limited elongation / reduction rolling mill uses working rolls with defined roughness adapted to the degree of roughness desired on the strip after operations of the rolls, in order to best ensure the adhesion of the subsequent coating on the strip.
  • the type of limited elongation / reduction rolling mill installed can be single-stage or even include two juxtaposed stands.
  • the strip On leaving the cleaning unit, the strip thus enters the oven (4) comprising successively at least one of the heating means among inductors or other heating means, radiant tubes or other temperature maintenance means, at least an additional zone for rapid heating and / or rapid cooling.
  • These heating means can have various dynamics of heating or cooling of the strip depending on the requirements of the heat treatment according to the invention.
  • the oven is ideally placed in a non-oxidizing atmosphere.
  • a section of the furnace comprises means for heating the strip ensuring a strip temperature below a threshold temperature for at least partial recrystallization of the strip, under a controllable temperature level between 300 ° C and 700 ° C for less than two minutes.
  • the furnace can finally raise the required strip outlet temperature before entry into the hot dipped metal coating unit around 500 ° C for conventional galvanization, then brings it down below this value, ideally around 465 ° C for a liquid galvanizing bath (this temperature can vary significantly depending on the type of alloy used) or to a temperature close to that ambient for an electrolytic bath.
  • the furnace therefore has means of heating and cooling distributed in an arrangement so that several (range or cycle of) stages and conduct of tape restoration temperature (depending on its properties and steel grade) and an adjustment to the temperature required at the input of the coating unit (5) are ensured.
  • the web then travels through the coating unit (5) such as by hot dipping in a bath of hot liquid metal as a coating agent.
  • Means for spinning, heating, cooling, soaking in a water tank are arranged downstream of the metal bath, then the strip is led to a second so-called intermediate accumulator, in order to adjust the running speed to a finishing section ( 6) which may successively comprise a second skin-pass, a leveler under tension, means for checking the properties of the galvanized strip (by thickness measurement / surface inspection / etc.), a second optional means of final coating (7 ) surface passivation with a drying module.
  • an exit section (8) comprising a set (81) of modules such as an output accumulator, an optional strip edge shear, final surface inspection means, an optional oiling module, a strip shear allowing the cross cutting of strips in order to to divide and direct the strip on at least one winder and ideally two winders (8a, 8b).
  • modules such as an output accumulator, an optional strip edge shear, final surface inspection means, an optional oiling module, a strip shear allowing the cross cutting of strips in order to to divide and direct the strip on at least one winder and ideally two winders (8a, 8b).
  • This exemplary embodiment of the installation according to the invention thus allows the implementation of an advantageous method of pickling and metallic coating of a continuously moving metal strip, comprising successively according to the movement at least one step of pickling (2), a strip temperature control step (4), a metal coating step (5), and for which the metal strip upstream of the stripping step is by default a hot rolled product,
  • Figure 2 illustrates as simply as possible the intended principle of tape restoration in the oven (4) of the installation according to the invention as described in figure 1 .
  • the hardness (D) of the strip (the increase in hardness is defined as hardening) is given as a function of the temperature T (° C) on the abscissa.
  • the object of the present invention is then to be able to reduce the hardness of the strip leaving the limited elongation / reduction rolling mill by a heating / cooling arrangement of the furnace (4) making it possible to subject the strip to a thermal cycle in an interval and under at least one temperature level included in the hatched part (REST) of the figure 2 representing a possible range of tape restoration temperature.
  • the curve shown thus shows quite simply that the rise in temperature from the hardened state (Ee) in the restoration field brings the strip back to its state close to the initial hardened state (Ei), however without having to raise the temperature.
  • Figure 3 presents a graph of temperature T (° C) as a function of time t (s) for three possible settings for controlling the restoration step targeted by figure 2 , for example for three grades or three strip reduction conditions at the inlet of the furnace (4).
  • a thermal adjustment path of the furnace is thus controlled in order to optimize a temperature cycle applied to the strip moving in at least one enclosure of the furnace, with the aim of carrying out a phase of restoring the material of the strip, depending on the external conditions. and intrinsic to said strip, then for bringing the strip to temperature at the end of the restoration, particularly in order to minimize the active heating / cooling time (minimized energy demand) for the restoration of the strip.
  • Dt_Rest the end of the restoration period
  • the method of stripping and metallic coating of a continuously moving metal strip can provide that the thermal cycle step initially dedicated for mastering a single strip restoration is extended. in the sense that at least partial band recrystallization, or even grain enlargement, is achieved.
  • the thermal cycle step initially dedicated for mastering a single strip restoration can be extended to a thermal treatment step such as annealing requiring a furnace provided with suitable heating and cooling thermal powers.
  • Annealing generally consists of at least a first restoration step, then a partial or total recrystallization step and finally optionally a grain enlargement step. This is particularly suitable with a relatively high rate of reduction of the rolling mill upstream of the furnace, for example above 5% or even up to at least 40%.
  • the invention provides that the installation according to the invention can thus have at least one section of the furnace comprising means for heating (and / or cooling) the strip ensuring temperature control.
  • the installation according to the invention can thus have a section of the furnace comprising at least means for heating (and / or cooling) the strip ensuring strip temperature control above a minimum recrystallization temperature. at least partial of the strip and / or up to grain growth, ideally above 500 ° C for less than two minutes, the rolling mill exhibiting a high reduction rate greater than 5%.
  • recrystallization temperature values are generally between 500 ° C and 850 ° C, and the associated values of grain growth temperatures are higher, reaching and exceeding 900 ° C.
  • heating and / or cooling means recommended for the purpose of allowing temperature control, such as the control of at least one thermal cycle (restoration then, if necessary, recrystallization, grain magnification), radiant elements (such as tubes) or / and inductors are placed in the furnace.
  • radiant elements such as tubes
  • inductors are placed in the furnace.
  • the use of inductors is generally more expensive than the use of radiant elements, in particular in terms of energy consumption.
  • the rolling mill at the outlet of the pickling unit makes it possible in particular to modify (amplify) the surface roughness of the rolled strip, namely that surface roughness changes the emissivity coefficient of the strip, that is, a strip with a smooth surface finish more easily reflects heat radiation emitted by radiant heat transmitters, while 'conversely, if the surface is rough, the tape will better absorb the heat radiated.
  • the rolling mill upstream of the furnace thus makes it possible to optimize or even shorten the thermal cycle desired for the invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (13)

  1. Anlage zum Beizen und zur Metallbeschichtung eines kontinuierlich durchlaufenden Metallbandes, welche in Durchlaufrichtung nacheinander wenigstens eine Beizeinheit (2), einen Ofen (4) und eine Metallbeschichtungs-Einheit (5) umfasst, und wobei das in die Beizeinheit einlaufende Metallband standardmäßig ein warmgewalztes Produkt ist,
    - wobei ein Walzwerk mit begrenzter Streckung/Dickenreduktion des Bandes zwischen der Beizeinheit und dem Ofen angeordnet ist und einen Dickenreduktionsgrad von 0,1 % bis mindestens 30 % aufweist;
    dadurch gekennzeichnet, dass:
    - der Ofen das Band einem Temperaturzyklus unterzieht, der es ermöglicht, eine Wiederherstellung der Struktur des Bandes zu beherrschen, und am Auslauf des Ofens eine Temperierung des Bandes bewirkt, die am Einlauf der Metallbeschichtungs-Einheit erforderlich ist;
    - ein Abschnitt des Ofens Mittel zur Erwärmung des Bandes umfasst, die ein Halten der Temperatur des Bandes unter einer Schwellenwerttemperatur der wenigstens teilweisen Rekristallisation des Bandes unter einem Temperaturniveau zwischen 300 °C und 700 °C während mindestens zwei Minuten sicherstellen.
  2. Anlage nach Anspruch 1, wobei der Ofen nacheinander wenigstens eines der Erwärmungsmittel aus Induktoren oder anderen Mitteln zur Wiedererwärmung, Strahlrohren oder anderen Mitteln zur Temperaturhaltung, wenigstens einen zusätzlichen Bereich von Mitteln zur schnellen Wiedererwärmung und/oder zur schnellen Kühlung umfasst.
  3. Anlage nach Anspruch 1, wobei im Ofen eine nicht oxydierende Atmosphäre aufrechterhalten wird.
  4. Anlage nach Anspruch 1, wobei das in die Beizeinheit einlaufende Metallband ein warmgewalztes Produkt ist, das eine minimale Dicke von einigen Zehntelmillimetern aufweist.
  5. Anlage nach Anspruch 1, wobei der installierte Typ des Walzwerks mit begrenzter Streckung/Reduktion eingerüstig sein oder auch zwei nebeneinander angeordnete Walzgerüste umfassen kann.
  6. Anlage nach Anspruch 1, wobei das Walzwerk mit begrenzter Streckung/Reduktion Arbeitswalzen mit definierter Rauigkeit aufweist, die an den gewünschten Rauigkeitsgrad auf dem Band nach den Walzvorgängen angepasst ist.
  7. Anlage nach Anspruch 1, wobei der Ausgang des Walzwerks mit begrenzter Streckung/Reduktion mit einer Einheit zur Reinigung (31) des Bandes gekoppelt ist, welche wenigstens eines der Reinigungsmittel aus einer Entfettung, einem Bürsten, einer Besprühung, einem Abstreifen, einer Trocknung umfasst.
  8. Anlage nach Anspruch 1, wobei der Abschnitt des Ofens wenigstens Mittel zur Erwärmung des Bandes umfasst, die eine Steuerung der Temperatur des Bandes oberhalb einer minimalen Temperatur der wenigstens teilweisen Rekristallisation des Bandes, idealerweise oberhalb von 500 °C, während mindestens zwei Minuten sicherstellen, wobei das Walzwerk einen hohen Reduktionsgrad aufweist, der größer als 5 % ist.
  9. Anlage nach Anspruch 1, wobei der Abschnitt des Ofens wenigstens Mittel zur Erwärmung des Bandes umfasst, die eine Steuerung der Temperatur des Bandes oberhalb einer minimalen Temperatur der wenigstens teilweisen Rekristallisation des Bandes und/oder bis zu einer Kornvergröberung, idealerweise oberhalb von 500 °C, während mindestens zwei Minuten sicherstellen, wobei das Walzwerk einen hohen Reduktionsgrad aufweist, der größer als 5 % ist.
  10. Anlage nach Anspruch 1, wobei der Ofen die Auslauftemperatur des Bandes, die am Einlauf in die Einheit zur Heißtauchmetallisierung erforderlich ist, auf etwa 500 °C erhöht und sie danach wieder unter diesen Wert absinken lässt, idealerweise auf 465 °C für ein flüssiges Galvanisierungsbad, wobei diese Temperatur je nach Typ der verwendeten Legierung erheblich variieren kann, oder auf eine Umgebungstemperatur für ein elektrolytisches Bad.
  11. Anlage nach Anspruch 1, wobei das Metallband vor dem Einlauf in die Beizeinheit ein kaltgewalztes Produkt ist, welches das warmgewalzte Produkt ersetzt, wobei in diesem Fall das Band nicht in der Beizeinheit gebeizt wird, etwa von der Beizeinheit zum Walzwerk mit begrenzter Streckung/Reduktion umgelenkt wird, und der Ofen zusätzliche Mittel zur Erwärmung und zur Kühlung vorsieht, um ein Glühen des Bandes sicherzustellen.
  12. Verfahren zum Beizen und zur Metallbeschichtung eines kontinuierlich durchlaufenden Metallbandes, welches in Durchlaufrichtung nacheinander wenigstens einen Schritt des Beizens (2), einen Schritt der Wärmebehandlung mit Steuerung der Temperatur des Bandes (4) und einen Schritt der Metallbeschichtung (5) umfasst, und wobei das Metallband vor dem Schritt des Beizens standardmäßig ein warmgewalztes Produkt ist,
    - wobei ein Schritt der begrenzten Dickenreduktion, der Änderung der Rauigkeit und Ebenheit des Bandes zwischen dem Schritt des Beizens und dem Schritt der Steuerung der Temperatur des Bandes aktivierbar ist,
    - wobei der Schritt der Reduktion einen Dickenreduktionsgrad von 0,1 % bis mindestens 30 % ermöglicht und der Schritt der Änderung der Rauigkeit und Ebenheit des Bandes aktiviert ist, dadurch gekennzeichnet, dass der Schritt der Steuerung der Temperatur des Bandes das Band einem Temperaturzyklus unter einem Temperaturniveau zwischen 300 °C und 700 °C während mindestens zwei Minuten unterzieht, der es ermöglicht, eine Wiederherstellung der Struktur des Bandes zu beherrschen, und eine Temperierung des Bandes am Auslauf des Bandes bewirkt, die am Einlauf in die Metallbeschichtungs-Einheit erforderlich ist.
  13. Verfahren nach Anspruch 12, wobei der Schritt des Temperaturzyklus in dem Sinne erweitert ist, dass wenigstens eine teilweise Rekristallisation des Bandes oder sogar eine Kornvergröberung erreicht wird.
EP15703485.1A 2014-03-31 2015-01-26 Anlage und verfahren zum beizen und zur metallbeschichtung eines metallbandes Revoked EP3126539B1 (de)

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PCT/EP2015/051427 WO2015149960A1 (fr) 2014-03-31 2015-01-26 Installation et procédé de décapage et de revêtement métallique d'une bande métallique

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