EP4299783A1 - Dispositif et procédé d'application d'une couche sur un produit plat en acier - Google Patents

Dispositif et procédé d'application d'une couche sur un produit plat en acier Download PDF

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Publication number
EP4299783A1
EP4299783A1 EP22182309.9A EP22182309A EP4299783A1 EP 4299783 A1 EP4299783 A1 EP 4299783A1 EP 22182309 A EP22182309 A EP 22182309A EP 4299783 A1 EP4299783 A1 EP 4299783A1
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EP
European Patent Office
Prior art keywords
steel product
flat steel
layer
range
nozzle
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.)
Withdrawn
Application number
EP22182309.9A
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German (de)
English (en)
Inventor
Christian Pfob
Johann Strutzenberger
Christian Karl Riener
Harald Unger
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.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl GmbH
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 Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Priority to EP22182309.9A priority Critical patent/EP4299783A1/fr
Priority to EP23164714.0A priority patent/EP4299785A1/fr
Priority to EP23731317.6A priority patent/EP4547884A1/fr
Priority to JP2024577149A priority patent/JP2025521802A/ja
Priority to KR1020257002754A priority patent/KR20250056889A/ko
Priority to US18/880,058 priority patent/US20260015706A1/en
Priority to JP2024577428A priority patent/JP2025521866A/ja
Priority to KR1020257003067A priority patent/KR20250057774A/ko
Priority to US18/880,047 priority patent/US20260015705A1/en
Priority to PCT/EP2023/066811 priority patent/WO2024002821A1/fr
Priority to EP23734595.4A priority patent/EP4547885A1/fr
Priority to PCT/EP2023/066821 priority patent/WO2024002824A1/fr
Priority to CN202380063139.8A priority patent/CN119895071A/zh
Priority to CN202380060264.3A priority patent/CN119731365A/zh
Publication of EP4299783A1 publication Critical patent/EP4299783A1/fr
Withdrawn legal-status Critical Current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
    • C23C2/14—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
    • C23C2/003—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
    • C23C2/50—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
    • 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

Definitions

  • the present invention relates to a device with which flat steel products can be coated with a layer based on zinc (Zn) or zinc-aluminum-magnesium (ZnAlMg), for example as a protective coating. This is also about a corresponding procedure.
  • flat steel products 100 such as steel strips or steel sheets, are coated with a zinc (Zn) or ZnAlMg alloy to improve corrosion resistance.
  • Zn zinc
  • ZnAlMg alloy zinc alloy melt pool 11
  • 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 area (in g/m 2 ) and the flat steel product 100 then transferred to a cooling area 16.
  • This A continuous process is generally called hot-dip coating.
  • the main problems here are often surface defects in the ZnAlMg layer.
  • a marble effect, a “toothpick” or a “beach pattern” defect can form on the ZnAlMg layer. or 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).
  • ZnAl layers Similar surface defects can also occur in Zn layers that contain a small Al content (typically less than 1% by weight). These layers are referred to here as ZnAl layers.
  • the task is therefore to provide a device in order to be able to coat flat steel products with a ZnAlMg layer or a ZnAl layer, which have a particularly durable and robust protective effect in terms of corrosion, with the surface of the protective coating being particularly homogeneous and without marbling (without “Marbel Effect”) and/or toothpick errors (without “Toothpick”).
  • the aim is to achieve a surface quality that meets the highest customer requirements.
  • the device should consume as little energy as possible, operate inexpensively and be robust in use.
  • a corresponding device which uses a continuous (hot-dipping) process and which allows a flat steel product to be provided with a metallic ZnAlMg layer or a ZnAl layer, which can serve, for example, as a (protective) coating .
  • This layer is intended to protect the steel substrate of the flat steel product from external influences.
  • the corresponding immersion bath is referred to as a zinc melt bath, whereby the term zinc alloy melt bath is intended to include both a melt bath which contains mostly zinc (Zn) and a small admixture of aluminum (Al) (typically less than 1% by weight), as well as a melt pool containing a ZnAlMg alloy.
  • the layer to be applied is also referred to here as a Zn-containing (protective) layer.
  • All embodiments involve applying a Zn-containing (protective) layer to a flat steel product, whereby the layer thickness of this layer should correspond to a target thickness (according to a corresponding specification).
  • This layer is created by passing the flat steel product through a zinc alloy melt bath is guided and gas is blown off on the exit side of the bath by means of a stripping nozzle device which comprises at least one gas nozzle.
  • the device is characterized in all or at least some of the embodiments in that it can be set up or prepared before the layer is applied and blown off in order to produce and coat a flat steel product according to specification with the ZnAlMg layer or the ZnAl layer can.
  • the system parameter(s) and process parameters define a so-called stripping effectiveness AWZ, which is essentially constant during the application of the layer (as long as the corresponding parameters do not change). However, smaller variations in the stripping effectiveness AWZ are possible.
  • the absolute local humidity f is determined in the vicinity of the controlled water vapor atmosphere.
  • the determination of the absolute local humidity f of the controlled water vapor atmosphere is preferably carried out within a predefined, virtual cylinder volume that surrounds or encloses the flat steel product in the area of the at least one gas nozzle.
  • this predefined, virtual cylinder volume defines the close range. Since the gases are mixed close to the front and back of the flat steel product, an area parallel to the front and back of the flat steel product is excluded when defining the virtual cylinder volume.
  • the virtual cylinder volume is preferably delimited by two planes, each of which is at a distance s/2 from the flat steel product.
  • the layer can be produced without marbling or without the formation of toothpick defects. If the determined ambient humidity f UG is currently smaller than that Stripping effectiveness (that is, if f UG ⁇ AWZ), the absolute local humidity f within the controlled water vapor atmosphere is deliberately increased until the absolute local humidity f in the close area is greater than the stripping effectiveness ( f > f UG and f > AWZ). Only then will a layer be produced without marbling or without the formation of toothpick defects.
  • the absolute local humidity f of the controlled steam atmosphere is generated through the use of the steam device.
  • the water vapor device is designed to specifically increase the absolute local humidity f within the controlled water vapor atmosphere, i.e. in the close range.
  • the controlled water vapor atmosphere is defined in a close area of the steam device, or the controlled water vapor atmosphere is provided in a close area of the water vapor device.
  • this close area can be defined by a predefined, virtual cylinder volume which extends on both sides of the flat steel product and which also surrounds or encloses the at least one gas nozzle.
  • this volume can optionally also be defined by a housing or an enclosure that surrounds the flat steel product on both sides. If a housing or enclosure is used, the interior area defined in this way is referred to as the close area.
  • the close range of the steam device comprises a volume in a range of 1 m 3 to 10 m 3 and preferably a volume of at least 2 m 3 , whereby when determining (by direct or indirect measurement) the absolute local humidity within It should be taken into account in the close area that it can be drier directly on the flat steel product due to mixing of the gaseous water vapor with the stripping gas than in areas further away from the flat steel product.
  • the absolute local humidity is preferably increased in a targeted manner in a close area of the steam device (if the ambient humidity f UG should be smaller than AWZ), whereby the monitoring or control of the current absolute local humidity is carried out by means of direct or indirect measurement at a distance of more than 20 cm from the flat steel product in order to avoid the significantly drier area.
  • the device or the stripping nozzle system can include an automatic support control which is designed to automatically adjust the flow rate of the (stripping) gas in order to keep the target thickness of the layer to be applied essentially constant.
  • the automatic circulation control is preferably designed so that it is able to compensate for fluctuations in one or more system parameters and process parameters.
  • the aluminum content (in percent by weight) can be equal to or greater than the magnesium content (in percent by weight) in all embodiments that use a ZnAlMg alloy melt pool.
  • 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 bath composition, monitoring or observation of the ambient humidity f UG and optionally also the current absolute local humidity f in the vicinity of the steam device and a targeted adjustment of the absolute local humidity f in the vicinity of the steam device can create a surface that shows no or negligibly low marbling and no or negligibly low toothpick defects.
  • the stripping efficiency AWZ is kept essentially constant in order to obtain a consistent layer (which is within the specified specification).
  • the values of the absolute local air humidity f which according to the invention should be present in the vicinity of the flat steel product in the close range, are in the range of 1 g/Nm 3 to 300 g/Nm 3 in all embodiments, preferably in the range of 2.71 g/ Nm 3 to 50 g/Nm 3 , that is, the device can be operated reliably at an absolute local humidity f that is in the specified value range.
  • 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 ambient humidity f UG is permanently measured.
  • the ambient humidity f UG is measured from time to time.
  • the absolute local air humidity f is permanently measured in the close range.
  • the absolute local air humidity f is measured in the local area from time to time.
  • the device is preferably operated with a 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.
  • 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 molten bath 11 and blowing it off with (wiping) gas G on the output side A using a stripping nozzle device 14.
  • Exemplary devices are in the Figures 2A , 3A and 5 shown.
  • the purpose of the stripping nozzle device 14 is to strip off the excess (still liquid) ZnMgAl layer or ZnAl layer (layer 10) on the flat steel product 100 after it leaves the bath 11.
  • the layer 10 is produced according to the (prescribed) specification (the specification defines, for example, the target thickness) and that no marbling and/or no toothpick errors occur. To be more precise, it is about avoiding these “errors” when environmental conditions change in the production area (e.g. in the production hall). Even if the ambient air humidity f UG should change in the area surrounding the device 150, the device 150 will do so Invention ensures that marbling and/or toothpick defects do not occur and that layer 10 continues to be produced to specification.
  • the specification defines, for example, the target thickness
  • the specification can, for example, specify the target thickness of the layer 10 and/or the target (surface) coverage of the layer 10.
  • the target thickness typically there is a narrow tolerance range for the target thickness.
  • the layer 10 to be created lies within the tolerance range(s), the layer 10 essentially meets the requirements of the specification.
  • the device 150 is operated 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 of the specification.
  • the target thickness of the layer 10 per strip side is preferably in the range 3 to 30 ⁇ m in all embodiments, and particularly preferably in the range 4.5 to 15 ⁇ m.
  • the target surface support (coverage per belt side) 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 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 flow rate D of the (wiping) gas G which is released through the nozzle lip gap 17 in the direction of the front or rear, is given here in Nm 3 .
  • Nm 3 stands for standard cubic meters).
  • a standard cubic meter is the amount of a gas G contained in a volume of one cubic meter is. This applies at a temperature of 0 degrees Celsius and a pressure of 1.01325 bar.
  • the absolute local air humidity f in the close area NB and/or the ambient air humidity f UG is preferably monitored continuously or from time to time in all embodiments determined (e.g. through direct or indirect measurement).
  • the device 150 includes a steam device 50 (see Fig. 2A and 5 ), which will be described in detail later.
  • this steam device 50 is preferably located in the area of the exit side A of the bath 11.
  • the absolute local air humidity f in the short range NB (see Fig. 2A , 5 ) of the steam device 50 is specifically adjusted (increased).
  • the corresponding devices 150 include humidity sensors 51 which are arranged in the short-range area NB or which protrude into the short-range area NB in order to be able to monitor the absolute local humidity f in the short-range area NB continuously or from time to time. Controlling the absolute local humidity f in the short range NB enables targeted regulation of the air humidity f in the short range NB.
  • the humidity sensor(s) 51 for determining the absolute local air humidity f can also be arranged at a different location on the device 150 in all embodiments.
  • the device 150 can include at least one humidity sensor 56 for determining the ambient air humidity f UG , as in Fig. 2A and Fig. 5 shown at top right.
  • the measurement/monitoring of the absolute local humidity f can be carried out directly or indirectly (preferably within the close range NB) 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 ambient air humidity f UG can also be determined in all embodiments by measuring the air temperature TL and the relative air humidity r of the ambient air and calculating/deriving the absolute ambient air humidity.
  • the values of the absolute local air humidity f which according to the invention should be present directly in the vicinity of the flat steel product 100 in a close area NB between the output side A and the cooling area 16 (if present), are in the range 1 g/m 3 and smaller in all embodiments than 300 g/m 3 .
  • the absolute local air humidity f is preferably in the range 2.71 g/m 3 to 50 g/m 3 in all embodiments.
  • the device 150 enables the targeted adjustment/setting of the absolute local air humidity f in the close range NB in a value range from 1 g/m 3 to 300 g/m 3 .
  • the device 150 can comprise at least one steam generator DG in or at the proximity area NB in all embodiments.
  • Fig. 2A an embodiment is shown with two steam generators DG, which are placed at the upper edge of the short area NB near the front and back of the flat steel product 100.
  • Fig. 5 an embodiment is shown with four steam generators DG, which are placed outside the close area IB and which introduce gaseous water vapor WG near the front and back of the flat steel product 100 into the close area NB via gas lines 54 and inlet bridges 53.
  • one or more steam generator(s) DG is/are preferably used, which is/are designed as a pure steam generator, which generates gaseous water vapor WG from purified or highly purified water.
  • care is taken to ensure that the system parameters and/or process parameters are specified so that the layer 10 to be applied essentially corresponds to the specification. This means that care is taken to ensure that a layer 10 is applied and blown off which, for example, corresponds to the target thickness (within tolerances) and which at the same time shows no or very little marbling and no or only very little toothpick defects.
  • the current flow rate D of the gas G can be adjusted automatically in a known manner (for example in terms of control technology through an automatic support control) in order to keep the target thickness of the layer 10 to be applied essentially constant if one or more of the system parameters and /or process parameters should change.
  • Fig. 3A also 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. 3A additionally shows in a purely schematic form the supply of gaseous water vapor WG according to the invention (by two block arrows on the right and left of the nozzle 15).
  • 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 determined by the negative first derivative of the pressure profile 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.
  • the equations that describe the dynamic flow behavior of the gas G on the flat steel product 100 are very complex. This is due, among other things, to the fact that in the gas jet that emerges through the nozzle lip gap 17 of the nozzle 15, areas with laminar and turbulent flow patterns form on the layer 10 of the flat steel product 100.
  • the gas jet sucks in ambient air, which is swirled with the gas G. Details can be found, for example, in the aforementioned publication “Wall Pressure and Shear Stress Measurements Beneath an Impinging Jet”. In addition to the ambient air, the gas jet also sucks in gaseous water vapor WG.
  • Fig. 4 shows a summary graphical representation of several tests, with the absolute humidity f in g/m 3 on the ordinate axis and the stripping effectiveness AWZ (as a summary or generic term for the process and device parameters) on the abscissa.
  • the stripping effectiveness AWZ which can be directly compared with the absolute ambient air humidity f UG , can be determined as follows (inequality (2.1)): f UG > ⁇ Max + 500 ⁇ t ⁇ 636 14
  • Fig. 4 Referenced.
  • the black filled circles of the Fig. 4 represent flat steel products 100 in which marbling has clearly visibly formed on the surface of layer 10 and the gray filled circle stands for a flat steel product 100 in which medium marbling has formed.
  • Fig. 4 Five pairs of experiments (Examples 1 - 5) are shown. The corresponding process and system parameters as well as the stripping effectiveness AWZ and the absolute humidity f , which was measured in the close range NB, are listed in Table 1. Table 1 is as Fig. 7 shown. The The third-to-last column of Table 1 indicates whether the steam device 50 was switched on to increase the local humidity. Black, gray and white circles are shown in Table 1 in accordance with Fig. 4 used. The penultimate column indicates in text form whether there was strong marbling, medium marbling or no marbling and the last column on the far right in Table 1 indicates whether the condition of the inequality f > AWZ was fulfilled.
  • a straight line Ge is inserted as a dividing line in order to separate, as a first approximation, those tests with marbling from those that show no or only negligible marbling. In the tests that lie above the straight line Ge, no marbling or only negligible marbling occurred (a corresponding flat steel product 100 with a layer 10 without marbling is in Fig. 6A shown).
  • 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.
  • 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. 2A and 5 ) or resistance heating can be specified.
  • the alloy melt pool 11 is preferably operated with a reduced bath temperature TB red in all embodiments.
  • the reduced bath temperature TB red is preferably in the already mentioned range 420 ⁇ TB red ⁇ 460 degrees Celsius.
  • the bath temperature TB is an important parameter and can preferably be set/specified relatively freely within the stated temperature limits in all embodiments if other process and system parameters are adjusted at the same time so that AWZ remains essentially constant and if the humidity in the local area NB is adjusted in this way that the condition of the inequality f > AWZ is still fulfilled.
  • the device 150 works particularly reliably within these (value) ranges.
  • a corresponding gas nozzle 15 has a length parallel to the y-axis.
  • the nozzle 15 preferably has an active length (called nozzle length DL), which is the Bandwidth w (see Figs. 6A - 6C ) of the band-shaped flat steel product 100 corresponds.
  • the thickness d of the gas nozzle 15 is defined parallel to the x-axis (see Fig. 3A ).
  • the bandwidth w of the strip-shaped flat steel product 100 is in the range from 500 mm to 2500 mm and particularly preferably in the range from 1159 mm to 1614 mm in all embodiments.
  • the absolute local humidity f in the short area NB is measured permanently or from time to time and if the absolute local humidity f "threatens" to fall below a threshold in the short area NB, which is defined by AWZ, the air humidity is determined by the use of the steam device 50 increased.
  • the steam generator(s) DG can increase the output of gaseous water vapor, or the steam generator(s) DG can be switched on to produce gaseous water vapor.
  • a steam generator DG preferably comprises a steam generator and, for example, a valve 55 (see Fig. 5 ), which can regulate the gas flow through line 54.
  • the steam generator and/or the valve 55 may be connected to the controller 250 in all embodiments (not shown).
  • 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” (that is, it contains little air humidity).
  • the measurement of the absolute local air humidity f is preferably carried out in all embodiments directly or indirectly in an area that has at least a distance s/2 of 20 cm from the line of impact.
  • the moisture sensors 51 are located a small distance above the nozzles 15 and the impact lines.
  • the moisture sensors 51 are located a small distance below the nozzles 15 and the impact lines.
  • FIG. 2B A virtual cylinder volume vZV is shown in a schematic representation as an example.
  • This predefined, virtual cylinder volume vZV surrounds or encloses the flat steel product 100 in the area of the at least one gas nozzle 15 (not in Fig. 2B shown).
  • the predefined, virtual cylinder volume vZV defines the short range NB. Since the gases WG and G are mixed close to the front and back of the flat steel product 100, an area parallel to the front and back of the flat steel product 100 is excluded when defining the virtual cylinder volume vZV, as in Fig. 2B shown.
  • the virtual cylinder volume vZV is preferably limited by two planes, each of which has a distance s/2 from the flat steel product 100.
  • the device 150 includes, for example, two moisture sensors 51 (at least one per band side) and a moisture sensor 56. Each of these sensors 51, 56 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, V5, V6 are in Fig. 2A and 5 shown by dashed lines.
  • the humidity is not measured directly, but the current humidity is determined indirectly (e.g. optically).
  • the indirect determination of the absolute local air humidity f can be carried out in all embodiments by measuring the surface property(s) of the coated flat steel product 100 (three examples of a coated flat steel product 100 are in the Figures 6A, 6B and 6C shown).
  • a corresponding measurement of the surface property(s) can be carried out optically, for example, before the optional cooling region 16 or after the optional cooling region 16 (for example by optically measuring the reflectivity of the surface of the layer 10). With little or no marbling, the reflectivity is above a specified limit. If the reflectivity should decrease (e.g. if it falls below a tolerance limit), the humidity in the close area NB can be adjusted so that the inequality f > AWZ is fulfilled again.
  • 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 device 150 can then be set up/prepared by adjusting the parameters (system or process parameters). Embodiments are carried out by the overall system control and / or by the controller 250.
  • the already mentioned stripping effectiveness AWZ can be calculated by the controller 250 and/or by the overall system controller. The corresponding formulas are described below. In all embodiments, the stripping effectiveness AWZ can also be determined by external means (e.g. using a workstation computer).
  • an inert gas is used as the (wiping) gas G in all embodiments.
  • Nitrogen or a gas mixture containing nitrogen has proven particularly useful.
  • the suction of dry ambient air can lead to the formation of marbling on layer 10 (if f UG is smaller than AWZ). This is where the invention comes into play by automatically increasing the absolute local humidity f in the controlled water vapor atmosphere in the vicinity NB of the flat steel product 100, while AWZ is kept essentially constant.
  • the inequality (2.2) is preferably implemented in the controller 250 by software, or pairs of numbers for the stripping effectiveness numbers AWZ and for the correspondingly specified minimum humidity f min are stored in one or more tables. Using a lookup table, the controller 250 can then determine a minimum value f min for the absolute local moisture value f for a currently valid stripping effect number AWZ and pass it on to the steam device 50. The water vapor device 50 then generates an absolute local humidity value f in the short area NB, which is greater than f min . In these embodiments, f min corresponds more or less to the straight line Ge in Fig. 4 .
  • parameters in the following numerical or value ranges are preferably used.
  • the individual number or value ranges in Table 2 are not correlated with one another, or only in some areas, since the respective maximum and minimum values come from different experimental examples. Only the respective maximum and minimum values from Table 1 ( Fig. 7 ) and summarized here.
  • Table 2 parameter lower limit Upper limit TB [°C] 430 441 Z [mm] 5.9 9.0 D [Nm 3 /h] 1294 1468 w [mm] 1066 1541 v [m/min] 100 150
  • FIG. 7 From Table 1 (see Fig. 7 ), are concrete numerical values for the in Fig. 4 shown experimental results shown.
  • the table 1 of the Fig. 7 shows five test examples in which layers 10 without (visible) marbling were produced without (visible) marbling by specifying suitable process and/or system parameters, or stripping effectiveness numbers AWZ, and by increasing an absolute local moisture value f in the close range NB (as exemplified in Fig. 6A shown).
  • the first two columns of Table 1 contain those according to the specification specified edition per page and the bandwidth w of the flat steel product 100.
  • Table 1 uses five examples 1 - 5 to show the use of a steam device 50 to increase the absolute local air humidity f in the local area NB.
  • the nozzle distance Z, the nozzle lip gap d and the belt speed v were kept constant; the circulation, the bandwidth w, the nozzle pressure, the flow D and the bath temperature TB were not deliberately changed and are only subject to those in production usual spreads.
  • the stripping effectiveness AWZ calculated from this remains essentially unchanged ( ⁇ 10%).
  • the device 150 is operated in all embodiments in such a way that the calculated stripping effectiveness AWZ changes by a maximum of ⁇ 5% when increasing the absolute local humidity f in the close range NB and adjusting the process and system parameters.
  • Example 1 The initial situation for Example 1 is shown in Table 1 under 1.1 (Table 1, line 1.1): With the given process and wiper nozzle parameters According to inequality (2.2), this results in a stripping effectiveness AWZ of 9.6 with a current absolute ambient air humidity f UG of 3.8 g/m 3 .
  • the local absolute humidity f applicable in the local area NB was increased from 3.8 to 20.6 g/m 3 using a steam device 50, with the process and wiper nozzle parameters being maintained within the usual process variations (Table 1, line 1.2).
  • Table 1, line 1.2 After deliberately increasing the air humidity f , the condition from inequality (2.2) for marbling-free production, namely f > AWZ, was fulfilled. In fact, marbling defects no longer occurred on layer 10 under these conditions.
  • a block arrow labeled 1.1 ⁇ 1.2 identifies this first example.
  • Examples 2-5 are to be understood analogously to example 1.
  • a block arrow labeled 2.1 ⁇ 2.2 identifies the 2nd example and a block arrow labeled 3.1 ⁇ 3.2 identifies the 3rd example.
  • Examples 4 and 5 are also in Fig. 4 marked accordingly.
  • a further embodiment of a device 150 is shown, whereby an approach for directly measuring the absolute local air humidity f in the close range NB and the ambient air humidity f UG in the area surrounding the device 150 is also used.
  • the structure of the device 150 is similar to that in Fig. 2A Device 150 shown, therefore the description of the Fig. 2A referred.
  • the device 150 has the Fig. 5 however, a housing 52.
  • a housing 52 is optional since it is sufficient for the invention if the water vapor device 50 generates a sufficiently high, absolute local air humidity f in the close range NB.
  • the liquid ZnAlMg alloy or ZnAl alloy is located in the bath 11, which is shown here as a rectangular container that is open at the top.
  • the steel flat product 100 which has a strip shape, is in Fig. 5 only a short length section 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 at the belt speed v between two opposing gas nozzles 15 of the stripping nozzle device.
  • the steam device 50 here includes the already mentioned housing 52, which is defined here, for example, by the shape of an approximately cylindrical body in 3-dimensional space.
  • This approximately cylindrical housing 52 of the steam device 50 is indicated schematically.
  • the housing 52 here consists of two housing halves, which are arranged symmetrically to the x-axis.
  • the close range NB defined in this way lies between the two housing halves.
  • the housing 52 of the steam device 50 can be divided purely mentally into four quadrants in the schematic sectional view.
  • the steam device 50 here comprises one steam generator DG per quadrant (that is, two steam generators DG per housing half).
  • Each of the steam generators DG is arranged outside the close area NB (or outside the housing 52).
  • each steam generator DG can introduce gaseous water vapor WG into the local area NB via a corresponding gas line 54, a valve 55 and an inlet bridge 53.
  • each inlet bridge 53 is fluidly connected to the short area NB via at least one passage opening in the housing 52.
  • Gas can thus flow from the respective steam generator DG through the line 54, the valve 55 and the inlet bridge 53 into the local area NB.
  • the housing 52 can optionally have a series of such passage openings parallel to the y-axis so that the gas WG can be distributed evenly in the short area NB.
  • the housing 52 of the steam device 50 sits directly on the nozzles 15 of the stripping nozzle device and has a housing height that is defined parallel to the x-axis.
  • the housing length which is defined parallel to the y-axis, corresponds in all embodiments to at least the bandwidth w of the flat steel product 100 and/or the length DL of the nozzle 15 (also defined parallel to the y-axis).
  • the housing 52 of the steam device 50 can also have a different shape in all embodiments.
  • Each of the nozzles 15 is, as indicated schematically, fed with the inert (stripping) 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. 5 designated V7, V8, V9 and V10.
  • a pump P G for example, is referred to here as a blower with control valves.
  • 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 process and system parameters, a layer 10 with a substantially constant target thickness is always produced.
  • the control comprises at least one sensor (not shown) which measures the actual thickness of the layer 10 after the excess zinc melt has been blown off. If the actual thickness is smaller than the target thickness, the control reduces the flow rate D and vice versa.
  • the horizontal y-line described is in the embodiment of Fig. 2A approximately in the area between the nozzles 15 of the stripping nozzle device 14 and the two steam generators DG. In the embodiment of the Fig. 5
  • the y-line described lies between the exit side A of the bath 11 and the nozzles 15 (here a small distance below the nozzles 15).
  • Each of the nozzles 15 can be moved parallel to the z-axis by a motor or actuator (not shown).
  • the motors or actuators can be connected to the controller 250.
  • the control of the nozzle distance Z can be laser-assisted in all embodiments. If the housing halves of the housing 52 are mechanically connected to the nozzles 15, the housing halves can be moved in solidarity with the nozzles.
  • 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 designated V11 and V12 in FIG. 5A.
  • the water vapor device 50 is designed to have an absolute local air humidity f in the short range NB in the range of 1 g/m 3 to 300 g/m 3 , preferably in the range of 2.71 g/m 3 up to 50 g/m 3 , the steam device 50 preferably only being switched on or off when f UG ⁇ AWZ.
  • the volume of the short area NB (for example defined by the virtual cylinder volume vZV or by the housing 52) of the steam device 50 can be between 1 m 3 and 10 m 3 in all embodiments.
  • Fig. 8 shows exemplary steps of a method that can be carried out in the devices 150 described.
  • Fig. 8 shows the steps in the form of a flowchart.
  • step S1 the individual components and elements of the device 150 are set up or prepared.
  • the device 150 can be set up or prepared, for example, based on a target specification of the layer 10 to be applied.
  • Setting up or preparing includes defining and (pre)setting the process and system parameters.
  • step S2 Before, during or after setting up S1, the corresponding stripping effectiveness AWZ is determined (step S2). Then based on one of the Inequalities or using a “lookup” table determines 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 to step S5. As part of step S5, the air humidity f in the close area NB is increased by the steam device 50. And it is then checked again in step S3 whether the condition f > AWZ is now fulfilled.
  • process and/or system parameters can also be slightly adjusted in an intermediate step, this adjustment preferably being carried out in all embodiments in such a way that AWZ remains essentially constant.
  • 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 environmental conditions. If f has reduced in the surroundings or in the vicinity NB of the device 150, it should be checked again (as in step S3) whether the condition f > AWZ is still fulfilled. If yes, then the application of layer 10 continues. If not, then (analogous to step S5) humidity f in the close area NB can be increased.

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  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Computer Hardware Design (AREA)
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EP22182309.9A 2022-06-30 2022-06-30 Dispositif et procédé d'application d'une couche sur un produit plat en acier Withdrawn EP4299783A1 (fr)

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EP22182309.9A EP4299783A1 (fr) 2022-06-30 2022-06-30 Dispositif et procédé 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
EP23731317.6A EP4547884A1 (fr) 2022-06-30 2023-06-21 Dispositif et procédé pour l'application d'une couche sur un produit plat en acier
JP2024577149A JP2025521802A (ja) 2022-06-30 2023-06-21 装置、方法、および、平鋼材への層の適用の後の水分制御された吹き払いのための装置
KR1020257002754A KR20250056889A (ko) 2022-06-30 2023-06-21 평판 강철(flat steel) 제품에 층을 적용하는 방법 및 장치
US18/880,058 US20260015706A1 (en) 2022-06-30 2023-06-21 Method and device for applying a layer onto a flat steel product
JP2024577428A JP2025521866A (ja) 2022-06-30 2023-06-21 層を平鋼製品に施すための方法およびデバイス
KR1020257003067A KR20250057774A (ko) 2022-06-30 2023-06-21 평판 강철 제품에 층을 적용한 후 제어된 습기를 블로잉(blow-off)하기 위한 장치 및 방법
US18/880,047 US20260015705A1 (en) 2022-06-30 2023-06-21 Device and method and device for moisture-controlled blow-off after the application of a layer onto a flat steel product
PCT/EP2023/066811 WO2024002821A1 (fr) 2022-06-30 2023-06-21 Dispositif et procédé pour l'application d'une couche sur un produit plat en acier
EP23734595.4A EP4547885A1 (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/EP2023/066821 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
CN202380063139.8A CN119895071A (zh) 2022-06-30 2023-06-21 用于将层施加至扁钢制品上的方法和装置
CN202380060264.3A CN119731365A (zh) 2022-06-30 2023-06-21 在扁钢产品上施加层后进行湿度控制吹除的装置和方法

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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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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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