EP4299784A1 - Procédé et dispositif d'application d'une couche sur un produit plat en acier - Google Patents

Procédé et dispositif d'application d'une couche sur un produit plat en acier Download PDF

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Publication number
EP4299784A1
EP4299784A1 EP22182311.5A EP22182311A EP4299784A1 EP 4299784 A1 EP4299784 A1 EP 4299784A1 EP 22182311 A EP22182311 A EP 22182311A EP 4299784 A1 EP4299784 A1 EP 4299784A1
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EP
European Patent Office
Prior art keywords
range
layer
flat steel
nozzle
steel product
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Pending
Application number
EP22182311.5A
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German (de)
English (en)
Inventor
Johann Strutzenberger
Christian Karl Riener
Harald Unger
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Voestalpine Stahl GmbH
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Voestalpine Stahl GmbH
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Priority to EP22182311.5A priority Critical patent/EP4299784A1/fr
Priority to EP23164714.0A priority patent/EP4299785A1/fr
Priority to PCT/EP2023/066821 priority patent/WO2024002824A1/fr
Priority to PCT/EP2023/066778 priority patent/WO2024002813A1/fr
Publication of EP4299784A1 publication Critical patent/EP4299784A1/fr
Pending legal-status Critical Current

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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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/525—Speed of the substrate
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—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
    • C23C2/18—Removing excess of molten coatings from elongated material
    • 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
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/51—Computer-controlled implementation
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing

Definitions

  • the present invention relates to a method with which flat steel products can be coated with a layer based on zinc-aluminum-magnesium (ZnAlMg), for example as a protective coating. This is also about a device that is designed to use the method according to the invention.
  • ZnAlMg zinc-aluminum-magnesium
  • flat steel products 100 such as steel strips or steel sheets, are coated with a ZnAlMg alloy to improve corrosion resistance.
  • this usually happens by introducing the flat steel product 100 from a furnace into a zinc alloy melt pool 11, as in Fig. 1 indicated using an exemplary device 150.
  • it is typically introduced into the bath 11 on the input side E through a trunk 12 with an inert atmosphere.
  • the flat steel product 100 is deflected by a (zinc bath) roller 13 and moved upwards out of the bath 11 on the exit side A.
  • the alloy melt film adhering to the front and back of the flat steel product 100 is stripped with a gas jet from the gas nozzles 15 of a stripping nozzle device to the target thickness (in the micrometer range) or to the target surface coating mass (in g/m 2 ) and the flat steel product 100 then transferred to a cooling area 16.
  • This continuous process is generally called hot-dip coating.
  • the main problems here are often surface defects in the ZnAlMg layer.
  • a marble effect the “toothpick” or “beach pattern” defect can develop on the ZnAlMg layer slag formation may occur.
  • patents e.g EP20130826634 AM/JMMaigne; JP20080256208 NSSMC/ Oohashi et al.
  • JP20080256208 NSSMC/ Oohashi et al. who try to eliminate similar surface defects (gloss effects or displaced oxide skins) with other means (reducing the O 2 content in the area around the wiper nozzle).
  • the task is therefore to provide a method and a corresponding device in order to be able to coat flat steel products which have a particularly long-lasting and robust protective effect in terms of corrosion, whereby the surface of the protective coating is particularly homogeneous, very smooth and without marbling (without “marbel Effect”) and/or toothpick error (without “toothpick”).
  • the aim is to achieve a surface quality that meets the highest customer requirements.
  • a continuous (hot-dipping) process and a corresponding device are provided, which make it possible to provide a flat steel product with a metallic layer, which can serve, for example, as a (protective) coating, this layer protecting the steel substrate of the flat steel product from the outside protects against influences.
  • the aluminum content (in percent by weight) can be greater than or equal to the magnesium content (in percent by weight).
  • the unavoidable impurities are in a range that is significantly smaller than 1 percent by weight (wt.%), preferably the sum of all unavoidable impurities is less than 0.5 percent by weight.
  • the combination of a precisely defined ZnAlMg alloy concept, monitoring or observation of the current absolute local air humidity and a targeted adjustment of the stripping process (or the corresponding process and/or system parameters or the stripping effectiveness factor) can create a surface that does not or shows negligible marbling.
  • the values of the absolute local air humidity which according to the invention should be present in the immediate vicinity of the flat steel product in an area between the output side and the cooling area (if present), are in the range from 1 g/m 3 to 300 g/m 3 in all embodiments. preferably in the range from 1.08 g/m 3 to 51 g/m 3 , ie the process can be carried out at an absolute local air humidity that lies within the specified range can be carried out successfully.
  • the stripping nozzle device can optionally be followed by a belt stabilization device, which serves to automatically stabilize the movement of the flat steel product.
  • the values of the absolute local air humidity can be determined in the area between the stripping nozzle device and the belt stabilization device.
  • the absolute local air humidity is permanently measured.
  • the absolute local humidity is measured from time to time.
  • the method is interrupted if the absolute local humidity is too low to adjust one or more of the adjustable parameters.
  • the method is preferably carried out with a reduced bath temperature TB red , which is in the range 420 ⁇ TB red ⁇ 460 degrees Celsius. In this area, the formation of slag can also be reduced.
  • the coated flat steel product can, as usual, be subjected to a temper-rolling or temper-rolling process and/or a bending-stretching process after coating.
  • the total degree of deformation for the coated flat steel product is preferably between 0.5% and 2.5%, preferably between 0.7% and 1.7%.
  • the coated flat steel product can be treated with the usual transport protection measures such as oiling or other chemical treatment agents, as in point 7 of the leaflet "Characteristic features 095 - hot-dip coated strip and sheet", edition 2010, published by the Steel Information Center Center 40039 Düsseldorf.
  • This layer 10 is produced by passing the flat steel product 100 from an input side E to an output side A through a zinc alloy melt pool 11 and on the output side A is blown off with gas G by means of a stripping nozzle device 14, as exemplified in the Figures 2 , 3A , 6 and 7 shown.
  • the purpose of the stripping nozzle device 14 is to strip off the excess (still liquid) ZnMgAl layer (layer 10) as it exits the bath 11.
  • care must be taken to ensure that, on the one hand, the layer 10 essentially does not change, even if the absolute humidity f of the environment changes, and, on the other hand, that no marbling occurs. In other words, it is about avoiding marbling when the absolute local humidity f changes, while at the same time the target thickness of the layer 10 is essentially maintained.
  • the target (area) coating mass of the layer 10 can also be specified in all embodiments. Typically there is a narrow tolerance range for the target thickness. As long as the layer 10 to be created lies within the tolerance range(s), the layer 10 essentially meets the specifications.
  • the stripping nozzle device 14 comprises at least one gas nozzle 15 (if only one side of the band is to be blown off), or two gas nozzles 15, which are opposite one another (if both sides of the band are to be blown off).
  • the Figures 2 , 6 and 7 are embodiments with two nozzles 15 and in Fig. 3A an embodiment with only one nozzle 15 is shown.
  • the method is carried out and controlled in such a way that the layer 10 per band side of the flat steel product 100 has a target thickness that lies within the tolerance window.
  • the target thickness of the layer 10 is the same for each band side Embodiments in the range 3 to 30 ⁇ m, and particularly preferably in the range 4.5 to 15 ⁇ m.
  • the target surface layer (layer mass per band side; referred to as layer per side in Tables 8A and 8B) is in the range from 20 to 200 g/m 2 and particularly preferably in the range from 30 to 100 g/m 2 .
  • the aluminum content (in percent by weight) can be equal to or greater than the magnesium content (in percent by weight).
  • the absolute local air humidity f is determined continuously or from time to time (e.g. by direct or indirect measurement). This statement also applies to preventing or reducing toothpick formation.
  • the absolute local humidity f can be measured directly or indirectly in all embodiments. Indirect measurement here includes, among other things, measuring the air temperature TL and the relative humidity r and calculating/deriving the absolute local humidity f .
  • the values of the absolute local air humidity f which according to the invention in the immediate vicinity of the flat steel product 100 in a range between The output side A and the cooling area 16 (if present) should be present are in the range 1 g/m 3 and less than 300 g/m 3 in all embodiments.
  • the absolute local air humidity is in the range 1.08 g/m 3 to 51 g/m 3 in all embodiments.
  • the method enables the controlled application of the layer 10 to at least one at an absolute local humidity f that is greater than 1 g/m 3 and less than 300 g/m 3 by specifically adjusting adjustable parameters (process and system parameters). Side of the flat steel product 100.
  • care is taken to ensure that the adjustable parameters are adjusted in such a way that the layer 10 to be applied (continues to) essentially correspond to the target thickness. This means that care is taken to ensure that a layer is applied that corresponds to the target thickness (within tolerances) and that at the same time shows no or only very little marbling.
  • the belt speed v with which the flat steel product 100 is moved out of the zinc alloy melt pool 11 can also be changed, here too It is ensured that the target thickness of the layer 10 to be applied remains essentially constant.
  • adjustable parameters process and system parameters
  • process and system parameters are preferably changed in coordination with one another in order to ensure that the layer 10 that is applied corresponds to the target thickness.
  • the bath temperature TB of the alloy melt pool 11 has an influence on the viscosity of the melt during the stripping process.
  • An increased bath temperature TB leads to a reduced viscosity of the melt.
  • the adjustable parameters (process and system parameters) remained the same, more material would be stripped off than desired. Therefore, when the bath temperature TB is increased, the other adjustable parameters (process and system parameters) are changed so that the layer 10 continues to have the target thickness. For example, when increasing the bath temperature TB, the flow rate D of the gas G is reduced to reduce the stripping effect in order to continue to achieve the same target thickness.
  • the bath temperature TB of the alloy melt pool 11 is preferably in the range 400 ⁇ TB ⁇ 480 degrees Celsius, preferably in the range 409 ⁇ TB ⁇ 473 degrees Celsius, and particularly preferably in the range 420 ⁇ TB ⁇ 460 degrees Celsius. Within these range limits, the bath temperature TB can be adjusted to change the viscosity.
  • a bath temperature TB in the specified temperature range is specified in all embodiments. Maintaining this temperature window (temperature range) is important because unwanted slag can increasingly form on the flat steel product 100 if you work above the specified range.
  • the bath temperature TB can be adjusted, for example, by means of an inductive heating device 30 (see Fig. 2 and 6 ) or a resistance heater.
  • the bath temperature TB is preferably reduced in all embodiments.
  • the reduced bath temperature TB red is preferably in the already mentioned range 420 ⁇ TB red ⁇ 460 degrees Celsius.
  • a corresponding gas nozzle 15 has a length parallel to the y-axis.
  • the nozzle has 15 at all Embodiments have an active length that corresponds to the bandwidth w of the strip-shaped flat steel product 100 (see also Fig. 5 ).
  • the thickness d of the gas nozzle 15 is defined parallel to the x-axis.
  • the bandwidth w of the strip-shaped flat steel product 100 is preferably in the range from 500 mm to 2500 mm in all embodiments.
  • the bandwidth w of the strip-shaped flat steel product is particularly preferably in the range from 800 mm to 1800 mm in all embodiments.
  • the absolute local humidity f is measured permanently or from time to time and if the absolute local humidity f is too low, the application of the layer 10 is interrupted, for example to make adjustments to the adjustable parameters.
  • the thickness d of the nozzle lip gap 17 can only be adjusted manually in some of the devices 150, in at least some of the embodiments the process is stopped before the nozzle lip gap 17 is adjusted manually.
  • the absolute local air humidity f is measured directly or indirectly.
  • the measurement of the absolute local air humidity f is not carried out directly at the line of impact at which the gas G hits the layer 10 to be stripped off, since the gas mixture there is relatively “dry” (i.e. contains little air humidity).
  • the measurement of the absolute local air humidity f is preferably carried out directly or indirectly in an area that has at least a normal (at a right angle) distance of 20 cm from the line of impact or from the flat steel product 100.
  • the device 150 includes, for example, two Moisture sensors 51 (at least one per hinge side). Each of these sensors 51 has two contacts in the schematic representation, which can be connected to a controller 250, for example.
  • the corresponding connections or lines V1, V2, V3, V4 are in Fig. 2 and 6 shown by dashed lines.
  • All embodiments of the device 150 may include a controller 250.
  • this controller 250 can be designed as a computer-aided automation and control unit and include a human-machine interface, a computer and a database.
  • the controller 250 can be part of the overall system control of the device 150 in all embodiments, or it can be connected to the overall system control in all embodiments.
  • the adjustment/adjustment of the adjustable parameters can then be carried out in these embodiments by the overall system control and/or by the controller 250.
  • the air humidity is not measured at or in the surrounding area of the device 150 (e.g. within a virtual cylinder body vZK), but rather the current air humidity is determined indirectly.
  • the current humidity can be measured indirectly, for example, by using a type of light barrier to determine the transmission rate of an optical path.
  • a type of light barrier to determine the transmission rate of an optical path.
  • the indirect determination can be made by measuring the surface property(s) of the coated flat steel product 100 (three examples of a coated flat steel product 100 are shown in FIGS Figures 7A, 7B and 7C shown).
  • a corresponding measurement of the surface property(s) can be carried out optically, for example, before the cooling region 16 or after the cooling region 16 (for example by optically measuring the reflectivity of the surface of the layer 10).
  • Example photos of coated flat steel products 100 are shown.
  • An inert gas is preferably used as gas G in all embodiments. Nitrogen or a gas mixture containing nitrogen has proven particularly useful.
  • Fig. 3A shows the nozzle distance Z between the nozzle 15 and the corresponding strip side (here the front) of the flat steel product 100, as well as the thickness d of the nozzle lip gap 17.
  • the nozzle lip gap 17 serves as a gas outlet gap of the stripping nozzle device 14.
  • Fig. 3B shows a schematic representation of the gas pressure curve P, which results along the front of the flat steel product 100.
  • the pressure P depends on the position on the x-axis.
  • the pressure curve P ideally has the shape of a Gaussian curve, as in Fig. 3B indicated.
  • the half-width at the pressure P S /2 can be determined from this Gaussian curve, as shown, where P S represents the maximum pressure.
  • 2b is the half width in millimeters.
  • a narrow gas jet is defined by a small half-width 2b. The larger (further) the gas jet becomes, the larger the half-width 2b becomes.
  • Fig. 3C shows a representation of the shear force ⁇ relative to a position on the x-axis (the shear force ⁇ was given by the negative first derivative of the pressure profile of Fig. 3B determined). This is the shear force ⁇ , which acts on the layer 10 to be stripped off.
  • ⁇ max defines the maximum shear force occurring on the layer 10 to be stripped off.
  • the belt speed v is preferably in the range from 50 m/min to 200 m/min and particularly preferably between 70 and 150 m/min.
  • Fig. 4 shows a summarized graphical representation of numerous tests, with the stripping effectiveness AWZ (as a summary or generic term for the process and device parameters or, for short, stripping nozzle parameters) being plotted on the ordinate axis and the absolute air humidity f in g/m 3 being plotted on the abscissa.
  • AWZ stripping effectiveness
  • a so-called stripping effectiveness AWZ can be determined, which can be compared directly with the absolute local air humidity f , as follows (inequality (2.1)): f > ⁇ Max + 500 ⁇ t ⁇ 636 14
  • inequality (3) Further details on the stripping effectiveness AWZ can also be found in inequality (3), which will be discussed later.
  • the entire term on the right-hand side of this inequality (3) can also be used as a definition of the stripping efficiency AWZ.
  • Fig. 4 Before describing inequality (3), let us further refer to the Fig. 4 .
  • the gray or black filled symbols (squares, diamonds, triangles or circles) of the Fig. 4 represent flat steel products 100 in which marbling has clearly visibly formed on the surface of layer 10.
  • the marbling is particularly strong in the black-filled symbols.
  • the gray filled symbols represent less severe marbling.
  • the unfilled symbols on the other hand, represent no or negligible marbling.
  • a straight line Ge is inserted as a dividing line in order to separate, as a first approximation, those tests with clear or moderate marbling from those that show no or only negligible marbling. In the tests that lie to the right below the line Ge, there is no or only negligible marbling (a corresponding flat steel product 100 with a Layer 10 without marbling is in Fig. 7A shown).
  • the straight line Ge can be understood as a function of the stripping effectiveness AWZ (see also inequalities (2.1) and (3)).
  • stripping effectiveness AWZ can be adjusted depending on the absolute local air humidity f in order to avoid the occurrence of undesirable marbling.
  • This adjustment of the stripping effectiveness AWZ is preferably carried out in all embodiments in such a way that the target thickness of the layer 10, or the surface support (mass) of this layer 10, does not change or hardly changes. This means that when changing the stripping effectiveness AWZ, care is always taken to ensure that the layer 10 to be applied essentially has the desired thickness.
  • the second approach has the disadvantage that in the border area the separation between flat steel products 100 without marbling and flat steel products 100 with marbling is not entirely clear or unambiguous.
  • the best results can be achieved if a case distinction is evaluated according to the first approach using inequality (3) and/or inequality (2.1) (e.g. processed numerically by the controller 250).
  • the adjustment/adjustment of the adjustable parameters (system and/or process parameters), or the stripping effectiveness AWZ, can now be done in all embodiments or in at least some of the embodiments either using the inequality(s) (2.1) and/or (3). be made using the 1st or 2nd approach. Or, as already mentioned, a numerical representation of the inequality(s) (2.1) and/or (3) can also be used in the controller 250.
  • the adaptation/adjustment of the adjustable parameters (system and/or process parameters), or the stripping effectiveness AWZ, can now be carried out in all embodiments or in at least some of the embodiments in such a way that the surface support of the layer 10 and/or the (support) ) Mass of the layer 10, and / or the target thickness of the layer 10 remains constant or within narrowly specified tolerance limits, such as defined by a target specification.
  • the target specification can be specified by the manufacturer and/or the customer or client.
  • either inequality(s) (2.1) and/or (3) or the formulas of the 1st approach or the formulas of the 2nd approach are implemented in the controller 250 by software, or they are in one or more tables Numerical values for the absolute local humidity f and correspondingly suitable adjustable parameters (system and/or process parameters), or the stripping effective numbers AWZ, are stored. Using a lookup table, the controller 250 can then retrieve the correspondingly suitable adjustable parameters (system and/or process parameters), or stripping effective numbers AWZ, for a currently valid absolute local moisture value f and adjust the device 150, or give the machine operator a numerical value, for example for adjusting the thickness d of the nozzle lip gap (e.g. show on a display).
  • adjustable parameters system and/or process parameters
  • stripping effective numbers AWZ in the following number or value ranges are preferably used.
  • the individual number or value ranges in Table 1 are not correlated with each other, or only in some areas, because the respective maximum and minimum values come from different experiments. There were only those respective maximum and minimum values from Table 2 ( Fig. 8A , 8B ) and summarized here.
  • the table 2 ( Fig. 8A , 8B ) mentioned nozzle height is the vertical distance between the zinc bath level and the impact line of the gas jet on the layer 10 to be stripped off.
  • the nozzle pressure in Table 2, Fig. 8A , 8B is defined as the (over)pressure (based on the ambient pressure) of the stripping gas G in the nozzle 15 in mbar.
  • the flow rate D of the gas G per band side is typically in the range between 200 and 8000 Nm 3 per hour in all embodiments.
  • Table 1 parameter lower limit Upper limit TB [ 0 C] 409 473 Z [mm] 2.5 14.1 d [mm] 0.8 1.2 D [Nm 3 /h] 410 1775 k 0.55 1.0 w [mm] 1159 1614 b [mm] 0.76 1.76 v [m/min] 70 150
  • the table 2 of the Fig. 8B shows experiments in which layers 10 with medium (as exemplified in Fig. 7B shown) or even stronger Marbling (as exemplified in Fig. 7C shown) were generated.
  • the values of Table 2 of the Fig. 8B were also sorted by ascending b.
  • Example 1 Reduction of the stripping effectiveness AWZ by reducing the nozzle distance Z (see Table 3).
  • Table 3 shows two test examples 1.1 and 1.2, which demonstrate a reduction in the stripping effectiveness AWZ by reducing the nozzle distance Z from 10 mm to 8 mm.
  • the EEZ is calculated according to inequality (3) to a value of 21.3.
  • the nozzle distance Z was reduced from 10 mm to 8 mm, whereby the bandwidth w, the nozzle lip gap d, the belt speed v, the bath temperature TB and the layer coverage per side were left constant. Due to the changed nozzle distance Z, the ratio Z/d is shifted, which also changes the values determined for b and k. From Table 3 it can be seen that here as As a result of the change in the nozzle distance Z, the nozzle pressure and thus the gas flow per side D had to be reduced from 1691 to 1386 Nm 3 /h by an automatic control of the stripping nozzle system in order to keep the thickness of the layer 10 essentially constant.
  • Example 2 Reduction of the stripping effectiveness AWZ by reducing the nozzle lip gap d.
  • Table 4 shows two test examples 2.1 and 2.2, which demonstrate a reduction in the stripping effectiveness AWZ by reducing the thickness d from 1.2 mm to 1 mm.
  • the AWZ is calculated according to inequality (3) to a value of 9.4.
  • the nozzle lip gap d was reduced from 1.2 mm to 1.0 mm, with the other parameters remaining essentially constant.
  • the ratio Z/d is shifted, which also changes the values determined for b and k. If you now calculate the stripping effectiveness AWZ using these new process parameters (Table 4, Example 2.2), the result is a value of 4.9. By reducing the nozzle lip gap from 1.2 mm to 1.0 mm, the stripping effectiveness AWZ could be reduced from 9.4 to 4.9 with an unchanged layer layer.
  • Example 3 Reduction of the stripping effectiveness AWZ by increasing the bath temperature TB.
  • Table 5 shows two test examples 3.1 and 3.2, which demonstrate a reduction in the stripping effectiveness AWZ by increasing the bath temperature TB from 439 ° C to 455 ° C.
  • the bath temperature TB was increased from 439 ° C to 455 ° C mm, with the other parameters remaining essentially constant.
  • the ratio Z/d remains unchanged, so the values determined for b and k remain constant when the bath temperature TB increases.
  • the absolute local humidity f is preferably defined as the absolute humidity within a virtual cylinder body vZK, as in Fig. 5 shown schematically.
  • this virtual cylinder body vZK an area that extends to the right and left parallel to the band-shaped flat steel product 100 is excluded.
  • the virtual cylinder body vZK is composed of two virtual cylinder volume segments, which are delimited on the one hand by a virtual cylinder surface which encloses the gas nozzles 15 concentrically or almost concentrically.
  • the two cylinder volume segments together have a volume in a range of 1m 3 to 10m 3 and preferably a volume of less than 2 m 3 .
  • the measurement of the absolute local humidity f is preferably carried out directly or indirectly within the cylinder volume segments.
  • a part of a further device 150 is shown, the two cylinder volume segments of the virtual cylinder body vZK being shown here.
  • the bath 11 is shown here as a rectangular container that is open at the top.
  • the liquid zinc alloy (abbreviated here as ZnAIMg) is located in the bath 11. Only a short length section of the flat steel product 100, which has a strip shape, is shown after emerging from the bath 11.
  • the flat steel product 100 is passed vertically out of the bath 11 in the direction of the x-axis between two opposing gas nozzles 15 of the stripping nozzle device 14. If the two gas nozzles 15 are arranged parallel to one another, then a center line ML can be defined between these nozzles 15.
  • This center line ML is in Fig. 5 shown in dashed lines.
  • the center line ML lies in a nozzle plane DE (which is defined as the xy plane).
  • the virtual cylindrical body vZK results in 3-dimensional space around the center line ML.
  • the “outer shell” of the virtual Cylinder body vZK runs concentric to the center line ML. All points of the “outer shell” have an equidistant distance ra from the center line ML (ra is the radius of the virtual cylinder body vZK).
  • the virtual cylinder body vZK includes at least the nozzles 15 of the stripping nozzle device 14 and has a virtual cylinder height vZH, which is defined parallel to the y-axis.
  • the virtual cylinder height vZH preferably corresponds to the bandwidth w of the flat steel product 100 and/or the length of the nozzle 15 (defined parallel to the y-axis).
  • the specified value ranges for the absolute local air humidity f can be defined for all embodiments within this virtual cylinder body vZK.
  • the absolute local air humidity f is measured along a y-line that runs parallel to the flat steel product 100 and that lies inside the virtual cylinder body vZK.
  • This y-line is parallel to the y-axis.
  • the so-called nozzle plane also called stripping plane
  • the center line ML lies within the nozzle plane.
  • the absolute local humidity f is determined or measured in all or at least some of the embodiments at several points on this y-line and an average of the determined or measured values is compared with the numerical range specified for the absolute local humidity f .
  • the absolute local air humidity f is in the range from 1 g/m 3 to 300 g/m 3 , preferably in the range from 1.08 g/m 3 to 51, in all or at least some of the embodiments inside a virtual cylinder body vZK g/m 3 , whereby this virtual cylinder body vZK has a volume of 2 m 3 .
  • the absolute local air humidity f can also be defined in a volume range of 1m 3 to 10m 3 and can be measured there directly or indirectly, the measurement preferably not being carried out directly on the impingement line of the gas G but on a y-line , which runs parallel to the y-axis above the impact line.
  • the y-line described is in the embodiment of Fig. 2 in the area between the nozzles 15 of the stripping nozzle device 14 and the lower entrance side of the cooling area 16.
  • the y-line described is in the embodiment of Fig. 6 above the impact line and is, for example, at least 20 cm away from the center line ML of the virtual cylinder body vZK, which is marked on the flat steel product 100 by a small white circle.
  • FIG. 6 A further embodiment of a device 150 is shown, whereby an approach for directly measuring the absolute local air humidity is also used here.
  • the structure of the device 150 is similar to that in Fig. 2 Device 150 shown, therefore the description of the Fig. 2 referred.
  • the structure of the device 150 is similar to that in Fig. 2 Device 150 shown, therefore the description of the Fig. 2 referred.
  • Of the bath 11, only the area of the exit side A is shown.
  • Two gas nozzles 15 are arranged parallel to the front and rear sides of the belt (the gas nozzles 15 extend into the plane of the drawing).
  • Each of the nozzles 15 is, as indicated schematically, fed with the inert gas G by means of pumps P g .
  • the two pumps P g are connected to the controller 250 in terms of control technology (or regulation technology) and the controller 250 can, for example, control the gas flow rate D per band side.
  • the corresponding connecting lines or lines are in Fig. 6 designated V5, V6, V7 and V8.
  • all embodiments of the device 150 include a control of the flow rate D of the gas G (called automatic circulation control), which is designed so that despite a change in the other adjustable parameters, a layer 10 with a substantially constant target thickness is always produced.
  • the regulation includes at least one Sensor (not shown) that measures the actual thickness of the layer 10 after blowing off. If the actual thickness is smaller than the target thickness, the control reduces the flow rate D and vice versa.
  • Each of the nozzles 15 can be moved parallel to the z-axis by a motor or actuator M.
  • the motors or actuators M are connected to the controller 250 as shown.
  • the corresponding connecting lines or lines are in Fig. 6 labeled V9, V10, V11 and V12.
  • the control of the nozzle distance Z can be laser-assisted in all embodiments.
  • the controller 250 can also be connected to an inductive heater 30 or to an electrical resistance heater of the bath 11 in order to adjust the bath temperature TB.
  • the controller 250 can set the operating frequency for driving the coil(s) 30 via a frequency generator FG. Therefore, the frequency generator FG is connected to the controller 250 in terms of control technology, as indicated.
  • the corresponding connecting lines or lines are in Fig. 6 designated V13 and V14.
  • a virtual cylinder body vZK is indicated, the center line ML of which cuts through the drawing plane slightly above the nozzles 15.
  • the location of the center line ML is shown by a small white circle on the strip-shaped flat steel product 100. Since the overall constellation is limited on the bottom by the bath 11 and on the top by the optional cooling area 16, the virtual cylinder body vZK is a virtual cylinder body vZK cut at the top and bottom.
  • two moisture sensors 51 are used in order to be able to determine the absolute local humidity.
  • the humidity sensors 51 are with the Control 250 connected.
  • the corresponding connecting lines or lines are in Fig. 6 labeled V1, V2, V3 and V4.
  • a device 150 as shown in Fig. 6 is shown as an example and schematically, the method can be carried out particularly advantageously and with reproducible results.
  • Fig. 9 shows exemplary steps of the method described here in the form of a flowchart.
  • the individual components and elements of the device 150 are set up (step S1).
  • the device can be set up, for example, based on a target specification of the layer 10 to be applied.
  • step S2 Before, during or after setting up S1, the current absolute local humidity f is measured (directly or indirectly) (step S2). Then, using one of the inequalities or using a “lookup” table, it is determined whether the condition f > AWZ is met (step S3). If f should be greater than AWZ (YES in the flowchart), the method for applying a layer 10 can start (step S4). If the condition f > AWZ is not met (NO in the flowchart), the method branches back to step S1. After branching back, adjustments may be made to the setup of the components and elements of the device 150, aiming to reduce AWZ to satisfy the condition f > AWZ. When adjusting, care is taken to ensure that the target specification of the layer 10 to be applied continues to be met.
  • checking the condition f > AWZ can be repeated from time to time during the application of the layer 10 in order to be able to react to changing absolute local air humidity f . If f has been reduced, it is checked again (as in step S3) whether the condition f > AWZ is still met. If yes, then the application of layer 10 continues. If not, then (analogous to step S1) adjustments can be made to the setup of the components and elements of the device 150 the aim is that the condition f > AWZ is or remains fulfilled.
  • a corresponding controller 250 can be designed or programmed in all embodiments in such a way that it is taken into account that a change in the thickness d and/or the distance Z has little or no influence on the stripping effectiveness AWZ if the ratio Z/d is small .
  • the process can be interrupted. As part of such an interruption, the width d of the nozzle lip gap 17 can then be adjusted manually, for example (which is not possible automatically in most devices 150).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Coating With Molten Metal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP22182311.5A 2022-06-30 2022-06-30 Procédé et dispositif d'application d'une couche sur un produit plat en acier Pending EP4299784A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP22182311.5A EP4299784A1 (fr) 2022-06-30 2022-06-30 Procédé et dispositif d'application d'une couche sur un produit plat en acier
EP23164714.0A EP4299785A1 (fr) 2022-06-30 2023-03-28 Dispositif et procédé pour un soufflage sous humidité controlée après l'application d'une couche sur un produit plat en acier
PCT/EP2023/066821 WO2024002824A1 (fr) 2022-06-30 2023-06-21 Dispositif et procédé de soufflage à humidité régulée après l'application d'une couche sur un produit plat en acier
PCT/EP2023/066778 WO2024002813A1 (fr) 2022-06-30 2023-06-21 Procédé et dispositif pour appliquer une couche sur un produit plat en acier

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521405A1 (de) * 1951-01-28 1969-08-21 Nat Steel Corp Verfahren zur Herstellung von UEberzuegen
DE2709551A1 (de) * 1977-03-04 1978-09-07 Inland Steel Co Mit zink-aluminium-legierungen beschichtete eisenmetallgegenstaende sowie mittel und verfahren zu ihrer herstellung
EP0172682A1 (fr) * 1984-07-30 1986-02-26 Armco Inc. Procédé pour contrôler la vapeur de zinc dans un procédé de finition lors d'un procédé de galvanisation de bandes d'acier
DE3933244C1 (en) * 1989-10-05 1990-06-13 Hoesch Stahl Ag, 4600 Dortmund, De Continuous zinc coating appts. for coating metal strip - comprises melt alloy bath covered with hood having hydrogen, steam and inert gas atmos. and control system
JP2008256208A (ja) 2007-03-30 2008-10-23 Volvo Construction Equipment Ab 建設装備用油圧回路
WO2014033153A1 (fr) 2012-09-03 2014-03-06 Voestalpine Stahl Gmbh Procédé de dépôt d'un revêtement protecteur sur un produit plat en acier et produit plat en acier doté d'un revêtement protecteur correspondant
JP2020100886A (ja) 2018-12-25 2020-07-02 日本製鉄株式会社 連続溶融金属めっき方法及び連続溶融金属めっき装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4963042B2 (ja) 2006-06-22 2012-06-27 トクデン株式会社 熱媒通流ローラ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521405A1 (de) * 1951-01-28 1969-08-21 Nat Steel Corp Verfahren zur Herstellung von UEberzuegen
DE2709551A1 (de) * 1977-03-04 1978-09-07 Inland Steel Co Mit zink-aluminium-legierungen beschichtete eisenmetallgegenstaende sowie mittel und verfahren zu ihrer herstellung
EP0172682A1 (fr) * 1984-07-30 1986-02-26 Armco Inc. Procédé pour contrôler la vapeur de zinc dans un procédé de finition lors d'un procédé de galvanisation de bandes d'acier
EP0172682B1 (fr) 1984-07-30 1989-02-01 Armco Inc. Procédé pour contrôler la vapeur de zinc dans un procédé de finition lors d'un procédé de galvanisation de bandes d'acier
DE3933244C1 (en) * 1989-10-05 1990-06-13 Hoesch Stahl Ag, 4600 Dortmund, De Continuous zinc coating appts. for coating metal strip - comprises melt alloy bath covered with hood having hydrogen, steam and inert gas atmos. and control system
JP2008256208A (ja) 2007-03-30 2008-10-23 Volvo Construction Equipment Ab 建設装備用油圧回路
WO2014033153A1 (fr) 2012-09-03 2014-03-06 Voestalpine Stahl Gmbh Procédé de dépôt d'un revêtement protecteur sur un produit plat en acier et produit plat en acier doté d'un revêtement protecteur correspondant
JP2020100886A (ja) 2018-12-25 2020-07-02 日本製鉄株式会社 連続溶融金属めっき方法及び連続溶融金属めっき装置

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* Cited by examiner, † Cited by third party
Title
C.V. TU ET AL.: "Experimental Thermal and Fluid Science", vol. 16, 1996, ELSEVIER SCIENCE INC., article "Wall Pressure and Shear Stress Measurements Beneath an Impinging Je", pages: 364 - 373

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