EP3303650B1 - Vorrichtung und verfahren zur verbesserten metalldampfabsaugung in einem kontinuierlichen schmelztauchverfahren - Google Patents

Vorrichtung und verfahren zur verbesserten metalldampfabsaugung in einem kontinuierlichen schmelztauchverfahren Download PDF

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Publication number
EP3303650B1
EP3303650B1 EP16727969.4A EP16727969A EP3303650B1 EP 3303650 B1 EP3303650 B1 EP 3303650B1 EP 16727969 A EP16727969 A EP 16727969A EP 3303650 B1 EP3303650 B1 EP 3303650B1
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EP
European Patent Office
Prior art keywords
openings
blow
suction
metal
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP16727969.4A
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German (de)
English (en)
French (fr)
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EP3303650A1 (de
Inventor
Sridhar Palepu
Michael Peters
Norbert Schaffrath
Sabine Zeizinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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Publication of EP3303650A1 publication Critical patent/EP3303650A1/de
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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
    • C23C2/04—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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the invention relates to a device for preventing surface defects caused by metal dust on a metal strip to be coated in a continuous hot dip process, wherein the metal strip to be coated is at least partially conveyable through the device along an axial direction, with a blow-suction unit, wherein the Blas Suction unit having a plurality of injection openings for loading the metal strip with inert gas, wherein a plurality of injection openings on a first side of the metal strip and a plurality of injection openings on a second side of the metal strip are arranged or arranged, wherein the blow-suction unit a plurality of suction openings for sucking with metal vapor and / or metal dust loaded inert gas, wherein a plurality of suction openings arranged on the first side of the metal strip and a plurality of suction openings on the second side of the metal strip or can be arranged.
  • the invention also relates to a method for preventing surface defects caused by metal dust on a metal strip to be coated in a continuous hot dip method, comprising the steps of conveying the metal strip to be coated at least in sections along an axial direction through a device, in particular through a device according to the invention
  • Apparatus comprising a blow-suction unit, applying inert gas to the metal strip through a plurality of blowing openings of the blow-suction unit, wherein a plurality of injection openings are arranged on a first side of the metal strip and a plurality of injection openings on a second side of the metal strip , and suctioning metal gas and / or metal dust-laden inert gas through a plurality of suction openings of the blow-suction unit, wherein a plurality of suction openings on the first side of the metal strip and a plurality of Absaugöffnun conditions are arranged on the second side of the metal strip.
  • devices for continuous hot-dip galvanizing steel strip consist inter alia of a continuous furnace and a zinc bath (molten bath).
  • the steel strip is continuously annealed. Recrystallization of the steel sets the desired mechanical properties of the base material.
  • iron oxides formed in a preheating zone are thereby reduced.
  • the strip is cooled under protective gas to a temperature close to the melt bath temperature. The protective gas is intended to prevent the annealed strip from oxidizing before galvanizing, which would considerably impair the adhesion of the zinc layer.
  • a so-called furnace trunk is used as a connector between the continuous furnace and the zinc bath.
  • the furnace trunk is provided with both sides of the band in each case a single injection opening (circulation opening) and vertically below it on both sides of the band, each with a single suction opening.
  • the suction openings are each formed as a longitudinal slot in a tube which penetrates a side wall of the trunk and extends on the top and bottom of the steel strip over the entire steel strip width.
  • a plurality of injection openings and suction openings are provided and the distance between the respective injection opening and a suction opening assigned to it is selected and the flow velocity of the protective gas emerging from the respective injection opening is controlled such that an entrainment of protective gas in the direction of the zinc bath occurring during movement of the metal strip is counteracted ,
  • This is essentially achieved in that a mixed area is provided both with injection openings and with suction openings.
  • the area with injection openings and the area with extraction openings completely overlap or mesh with one another like a comb.
  • the present invention is therefore an object of the invention to provide a generic device and a generic method by which the extraction of metal vapor can be improved by the inert gas and the propagation of metal vapor can be reduced.
  • the blow-suction unit has a blowing area, in which the injection openings are arranged, and arranged in the strip running direction behind the blowing area arranged suction, in which the suction openings are arranged wherein the injection area and the suction area are arranged without overlapping.
  • the suction region is viewed in the axial direction, that is to say in the direction of travel of the strip, is arranged behind the injection region means that the properties of the device or of the method can be significantly improved.
  • the invention thus turns away from the most recent state of the art, which provides a mixed arrangement of injection openings and suction openings, conscious, and follows a contrary approach. Although this also provides a variety of injection openings and suction openings. However, these are provided in separate successively arranged areas. It has been shown that the combination of on the one hand a plurality of openings on each side of the band and on the other just no mixed, but rather a separate arrangement of the injection openings on the one hand and the suction on the other hand in successive areas due to numerous effects is advantageous.
  • an improved metal vapor extraction and an effective barrier system for ascending metal vapor, for example, in a furnace trunk can be achieved by the device or the method.
  • This is attributed inter alia to the fact that the direct mixing of metal vapor and protective gas can be reduced by the arrangement and design of the injection area and the suction area.
  • an improved, that is to say homogeneous, temperature distribution in the trunk is achieved by the device or the method can be achieved, which in turn counteracts a local condensation or resublimation of metal vapor.
  • a positive guidance laterally ascending metal vapors can be avoided.
  • the comparatively simple construction remains essentially independent of the width of a inserted oven trunk. As a result, the device or the method can finally be used for higher metal vapor concentrations.
  • the continuous hot dipping process may in particular be a continuous hot dip galvanizing.
  • the metal bath or molten bath may in particular be a zinc bath.
  • the metal vapor or metal dust can be zinc vapor or zinc dust in particular.
  • the coating may in particular be a galvanizing.
  • the metal strip may in particular be a steel strip.
  • the steel strip is conveyed through the device in a coil-to-coil process.
  • the first side of the metal strip is, for example, an upper side or front side of the metal strip.
  • the second side of the metal strip is, for example, a bottom or rear side of the metal strip.
  • the metal strip may, for example, have a width of at least 1000 mm, preferably at least 1300 mm, particularly preferably at least 1500 mm. It has been shown that the device or the method is also suitable for very broad bands.
  • the metal strip can be conveyed in the axial direction, for example, at a belt speed of at least 80 m / min, preferably at least 100 m / min, particularly preferably at least 120 m / min.
  • the belt speed is at most 180 m / min. Even at these high speeds an effective barrier to the zinc vapor and homogeneous temperatures can be achieved.
  • blow-suction units may be provided. So it is at least one blow-suction unit provided. Under one / the blow-suction unit is therefore at least one / understand the at least one blow-suction unit.
  • the suction area is arranged downstream of the injection area in the strip running direction, the metal strip conveyed in the strip running direction initially travels through the injection area and then through the suction area.
  • the injection area is free of suction openings and the suction area is free of injection openings. That is, the injection openings and the suction openings are spatially separated.
  • the injection area and the suction area for example, adjoin one another directly.
  • the injection openings and / or the suction openings may for example be at least partially provided as bores, which simplifies the manufacture of the device.
  • the protective gas is, for example, a gas which prevents the oxidation of the metal strip.
  • the shielding gas is a hydrogen-nitrogen mixture (HNX).
  • HNX hydrogen-nitrogen mixture
  • the shielding gas about 95% N 2 and about 5% H 2 .
  • the protective gas is, for example, at a temperature of at least 430 ° C, preferably at least 440 ° C, more preferably at a temperature of at least 550 ° C, in particular at a temperature of about 600 ° C, blown. As a result, condensation or resublimation of the metal vapor is further counteracted.
  • the injection openings and the suction openings are provided in such a way that the protective gas injected through the injection openings of the injection area is initially deliberately entrained with the metal strip conveyed by the device in the strip running direction and flows in the direction of strip travel and then towards the strip running direction the suction of the suction area flows.
  • the injection openings and the suction openings can for this purpose be arranged and / or formed accordingly.
  • the protective gas injected through the injection openings of the injection area is first deliberately entrained with the metal strip conveyed by the device in the strip running direction and flows in the strip running direction and then flows counter to the strip running direction to the suction openings of the suction area.
  • a targeted flow of the protective gas can be achieved by an arrangement of the suction region in the strip running direction behind the injection area.
  • the entrainment of the protective gas by the metal strip is deliberately provoked instead of counteracting it. This reduces a direct mixing of metal vapor and inert gas and provides an effective metal vapor barrier system.
  • a particularly homogeneous temperature distribution is achieved.
  • the device or the method is also suitable for higher metal vapor concentrations, which were hitherto unsatisfactory to handle.
  • the injected inert gas initially flows along the surface of the metal strip with the metal strip in the direction of strip travel until the flow strikes the surface of the metal bath or molten bath and is deflected there.
  • the shielding gas absorbs a large part of the metal vapors of the metal bath.
  • the shielding gas flows at a distance from the surface of the metal strip, for example along a walling, for example a furnace trunk, against the strip running direction to the suction openings of the suction area. This results in a continuous flow of the protective gas, so that an uninterrupted Metalldampfabsaugung is achieved.
  • the injection area and the suction area are arranged without overlapping.
  • An overlap is understood to mean that one area at least partially coincides with the other area.
  • the injection area formed by the injection openings and the suction area formed by the suction openings therefore do not overlap.
  • in the strip running direction initially only blowing openings and then exclusively suction openings are provided. It has been shown that this further improves the extraction of metal vapor by the protective gas and the propagation of metal vapor can be further reduced.
  • the injection openings of the injection area and / or the suction openings of the suction area are at least partially arranged in a regular grid, in particular with a shortest distance of at least 30mm, preferably at least 40mm, more preferably at least 60mm.
  • a particularly homogeneous temperature distribution can be achieved and, on the other hand, a further optimized flow of the protective gas can be achieved, which counteracts the propagation of metal vapor.
  • the blowing openings of the blowing area and the suction openings of the suction area are arranged in the same regular grid.
  • the injection openings and / or the suction openings are arranged in a rectangular grid.
  • the injection openings and / or the suction openings are located, for example, on the nodes of a (imaginary) two-dimensional rectangular grid.
  • the shortest distance of the injection openings and / or the suction openings in the axial direction is greater than transverse to the axial direction.
  • the shortest distance between the injection openings and / or the suction openings in the axial direction is between 50 mm and 150 mm, preferably between 80 mm and 120 mm, particularly preferably between 90 mm and 110 mm.
  • the shortest distance between the injection openings and / or the suction openings in the axial direction is about 100 mm.
  • the shortest distance of the injection openings and / or the suction openings transverse to the axial direction between 30 mm and 90mm, preferably between 40mm and 80mm, more preferably between 50mm and 70mm.
  • the shortest distance of the injection openings and / or the suction openings transverse to the axial direction is about 60mm.
  • the suction openings are at least partially larger than the injection openings formed.
  • the size of the injection openings or suction openings is understood in particular to mean the (average) diameter of the opening.
  • the diameter of the injection openings is preferably between 5 mm and 10 mm, preferably about 8 mm.
  • the diameter of the suction openings is preferably between 8mm and 15mm, preferably about 10mm. It has been found that this can be achieved with respect to an efficient metal vapor extraction further improved flow.
  • the standard volume flow for the suction is greater than the standard volume flow for blowing.
  • the standard volume flow for injection per side of the metal strip is at least 100 Nm 3 / h (standard cubic meter), preferably at least 150 Nm 3 / h.
  • the standard volume flow is 100-300 Nm 3 / h.
  • the standard volume flow may also be higher depending on the width of the device.
  • the standard volume flow for the suction per side of the metal strip is at least 150 Nm 3 / h, preferably at least 200 Nm 3 / h.
  • the standard volume flow is 150-400 Nm 3 / h.
  • the standard volume flow may also be higher depending on the width of the device.
  • the injection openings are at least partially provided such that the protective gas substantially transversely to the axial direction from the injection openings in the direction of respective side of the metal strip flows.
  • the injection openings are for example arranged and / or formed accordingly.
  • the protective gas flows in a preferred embodiment of the method according to the invention substantially transversely to the axial direction in the direction of the respective side of the metal strip from the injection openings.
  • the protective gas flowing out of the injection openings is directed at an angle of 70 ° to 110 °, preferably 80 ° to 100 °, particularly preferably about 90 ° in the direction of the respective side of the metal strip.
  • the blow-suction unit comprises a first blow-suction box, which is arranged on the first side of the metal strip to be coated, and a second blow-suction box, which on the second side of coating metal strip is arranged.
  • the device may also include other blow-suction boxes.
  • blow-suction boxes By providing blow-suction boxes, the loading of the metal strip with protective gas can be realized in a structurally particularly simple manner from both sides.
  • the blow-suction boxes for example, easily allow scalability of the device.
  • the blow-suction boxes are substantially flat.
  • the blow-suction boxes have at least one connection for blowing in the protective gas and at least one connection for sucking off the mixture of protective gas and metal vapor / metal dust.
  • the blow-suction boxes each have at least one blow box for providing the injection area and at least one suction box for providing the suction area.
  • a blow box and a suction box may be separated from each other by a partition wall.
  • a blow-suction box can also have a plurality of blow boxes and / or suction boxes. These may for example also be separated by a partition.
  • the blow boxes and / or the suction boxes each have a connection for blowing in the protective gas or for sucking off the mixture of protective gas and metal vapor / metal dust.
  • the device comprises a furnace trunk for connecting a continuous furnace with a metal bath, wherein the blow-suction unit is at least partially provided in the furnace trunk.
  • the method according to a preferred embodiment of the method is at least partially carried out in a furnace trunk for connecting a continuous furnace with a metal bath.
  • the furnace trunk may be at least partially heated, for example to a temperature of at least 400 ° C, preferably at least 450 ° C.
  • the furnace trunk has, for example, an inlet opening for retracting the metal strip and an outlet opening for extending the metal strip.
  • the furnace trunk tapers, for example, at least in sections, for example, from the inlet opening in the direction of the outlet opening.
  • the device is supplied in the strip running direction before the blow-suction unit, a sealing gas.
  • a sealing gas for this purpose, the device, for example, a barrier gas introduction exhibit.
  • the shielding gas can also be used for the purging gas and the purging gas corresponds to the composition already described, for example (HNX).
  • the sealing gas with at least 300 Nm 3 / h, for example, blown on one side.
  • the device also has one or more of the following units: a continuous furnace upstream of the blow-suction unit for heating the metal strip to be coated; a metal bath following the blow-suction unit, in particular a zinc bath, for coating the metal strip and optionally a stripping device adjoining the metal bath for adjusting the thickness of the coating of the metal strip; a separation device for cleaning the suction gas sucked through the suction openings and laden with metal vapor and / or metal dust; a heating device for heating the protective gas supplied via the injection openings, in particular to a temperature of more than 430 ° C.
  • the method additionally comprises one or more of the following steps: heating the metal strip to be coated in a continuous furnace upstream of the blow-suction unit; Coating the metal strip in a metal bath following the blow-suction unit, in particular a zinc bath, and optionally adjusting the thickness of the coating of the metal strip by a scraping device following the metal bath; Cleaning the protective gas sucked through the suction openings and laden with metal vapor and / or metal dust in a separating device; Heating the protective gas supplied via the injection openings in a heating device, in particular to a temperature greater than 430 °.
  • the temperature of the metal bath is for example between 400 ° C and 500 ° C, preferably between 440 ° C and 470 ° C.
  • the stripping device can be realized, for example, by air nozzles, for example air steel flat nozzles.
  • the zinc deposition apparatus may preferably be provided with a cooling device which effects resublimation of the metal vapor.
  • the resulting metal dust can be separated by means of a separator from the protective gas and passed, for example, in a collecting container.
  • Fig. 1 shows a longitudinal sectional view of an embodiment of a device 1 according to the invention in the form of a continuous hot-dip galvanizing plant for carrying out an embodiment of a method according to the invention.
  • the device 1 in particular has a furnace trunk 2.
  • a metal strip 4 to be galvanized, for example steel strip, is annealed in a continuous furnace (not shown) and fed to a zinc bath 6 under protective gas (HNX).
  • the band 4 dips obliquely down into the zinc bath 6 and is deflected by a roller 8 arranged in the zinc bath 6 upwards.
  • the bath temperature is typically in the range of about 440 ° C to 470 ° C.
  • the band 4 Upon exiting the bath 6, the band 4 entrains a quantity of liquid zinc which may be considerably higher than the desired coating thickness.
  • the still liquid excess coating material is stripped off by means of the air jet flat nozzles 10 extending across the band width from the first side and the second side (ie the upper side and the lower side or front side and rear side) of the now coated band 4.
  • insulating 12 for example, mineral wool and / or ceramic plates
  • the oven trunk 2 By means of the oven trunk 2 is to be prevented inter alia that the annealed strip 4 oxidized before galvanizing, whereby the adhesion of the zinc layer would be deteriorated. Therefore, the band 4 is subjected to inert gas.
  • the protective gas should also serve to counteract the propagation of zinc vapor.
  • the furnace trunk 2 is equipped with a special blow-suction unit 14, which acts on the metal strip 4 with inert gas and sucks the loaded with zinc vapor and / or zinc dust shielding gas.
  • Fig. 2 shows a perspective view of the Ofenrüssels 2 Fig. 1 and Fig. 3 shows a longitudinal sectional view of the Ofenrüssels 2 from Fig. 1 ,
  • the metal strip 4 to be coated is conveyed in this section along the strip running direction 16 through the furnace trunk 2 or through the blow-suction unit 14 of the device 1.
  • the blow-suction unit 14 has a plurality of injection openings 18 for acting on the metal strip 4 with inert gas.
  • a plurality of injection openings 18 are arranged on a first side of the metal strip and a plurality of injection openings 18 on a second side of the metal strip, so that the metal strip 4 can be acted upon on both sides with the protective gas.
  • the injection openings 18 form an injection area 20.
  • the blow-suction unit 14 also has a plurality of suction openings 22 for extracting protective gas laden with metal vapor and / or metal dust.
  • a plurality of suction openings 22 on the first side of the metal strip 4 and a plurality of suction openings 22 on the second side of the metal strip 4 are arranged.
  • the suction openings 22 form a suction area 24.
  • the injection area 20, in which the injection openings 18 are arranged is arranged in the strip running direction 16 before the suction area 24, in which the suction openings 22 are arranged.
  • the blowing region 20 and the suction region 24 are arranged without overlapping.
  • the blow-suction unit 14 comprises a first blow-suction box 14a, which is arranged on the first side of the metal strip 4 to be coated, and a second blow-suction box 14b, which on the second side of the metal strip to be coated 4 is arranged.
  • the blow-suction boxes 14a, 14b each have two blow boxes 26a and 26b for providing the blow-in area 20 and two suction boxes 28a and 28b respectively for providing the suction area 24.
  • the blow boxes 26a (or 26b) are mutually separated by a partition wall 42a (or 42b).
  • the suction boxes 28a (or 28b) are mutually separated by a partition wall 44a (or 44b).
  • the blow box 26a (or 26b) and the suction box 28a (or 28b) are separated from each other by a partition wall 46a (or 46b).
  • the individual blow boxes 26a, 26b each have separate connections 30a, 30b for supplying protective gas.
  • the standard volume flow for blowing through the ports 30a is about 150Nm 3 / h.
  • the standard flow for blowing through the ports 30b is also about 150 Nm 3 / h.
  • the standard volume flow for the suction through the ports 32a is about 200Nm 3 / h.
  • the standard volume flow for the suction through the ports 32b is also about 200Nm 3 / h.
  • Sealing gas are introduced into the device 1.
  • the sealing gas is identical to the shielding gas and is injected with 300 Nm 3 / h through the barrier gas inlet 3, as well as by the arrows 33 in Fig. 3 illustrated.
  • the sealing gas is advantageously between two Abdichtklappen (see. Fig. 1 ) fed.
  • the sealing gas By the sealing gas, the gas flow in the furnace trunk 2 is shielded by an upstream furnace, so that entrainment of zinc vapor is prevented in the furnace.
  • the pressure decreases from the area of the protective gas inlet 3 over the area of the blow boxes 26a or 26b to the area of the suction boxes 28a or 28b.
  • the injection openings 18 are provided such that the protective gas flows substantially transversely to the axial direction 16 from the injection openings in the direction of the respective side of the metal strip 4.
  • the protective gas is blown through the injection openings 18 perpendicularly in the direction of the respective side of the metal strip 4.
  • the direction of flow of the protective gas is illustrated by the arrows 34.
  • the protective gas injected through the injection openings 18 of the injection area 20 is first deliberately entrained with the metal strip 4 conveyed by the device 1 in the axial direction 16 and flows in the axial direction 16.
  • the protective gas flows along the surface of the metal strip 4.
  • the protective gas flows mixed with zinc vapor and Zinc dust along the wall of the furnace trunk 2 against the strip running direction 16 to the suction openings 22 of the suction 24th
  • Points 36 illustrate the distribution and concentration of zinc vapor and zinc dust.
  • concentration of zinc dust and zinc vapor decreases noticeably against the direction of strip 16.
  • the blow-suction unit 14 provides an effective barrier for the zinc vapor and the zinc dust and effective extraction of the zinc vapor and the zinc dust.
  • a plan view of the injection region 20 and the suction region 24 of the blow-suction box 14a is shown Fig. 1 ,
  • the injection openings 18 of the injection area 20 and the extraction openings 22 of the extraction area 24 are arranged in a regular grid.
  • the shortest distance between adjacent openings 18, 22 in the axial direction 16 is greater than transverse to the axial direction 16.
  • the shortest distance 38 of the injection openings 18 or the suction openings 22 in the axial direction is approximately 100 mm here.
  • the shortest distance 40 of the injection openings 18 or the suction openings 22 transversely to the axial direction 16 is about 60 mm.
  • the injection openings 18 are smaller than the suction openings 22 are formed. Of the Diameter of the injection openings 18 is about 8mm.
  • the diameter of the suction openings 22 is about 10mm.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
EP16727969.4A 2015-05-27 2016-05-20 Vorrichtung und verfahren zur verbesserten metalldampfabsaugung in einem kontinuierlichen schmelztauchverfahren Active EP3303650B1 (de)

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DE102015108334.5A DE102015108334B3 (de) 2015-05-27 2015-05-27 Vorrichtung und Verfahren zur verbesserten Metalldampfabsaugung bei einem kontinuierlichen Schmelztauchverfahren
PCT/EP2016/061483 WO2016188922A1 (de) 2015-05-27 2016-05-20 Vorrichtung und verfahren zur verbesserten metalldampfabsaugung

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WO2018228661A1 (de) * 2017-06-12 2018-12-20 Thyssenkrupp Steel Europe Ag Rüssel für eine schmelztauchbeschichtungsanlage sowie verfahren für dessen betrieb
WO2018228662A1 (de) * 2017-06-12 2018-12-20 Thyssenkrupp Steel Europe Ag Rüssel für eine schmelztauchbeschichtungsanlage
DE102018211182A1 (de) 2018-07-06 2020-01-09 Thyssenkrupp Ag Vorrichtung und Verfahren zum Schmelztauchbeschichten eines Metallbandes
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US10689742B2 (en) 2020-06-23
KR20180012289A (ko) 2018-02-05
WO2016188922A1 (de) 2016-12-01
US20180171458A1 (en) 2018-06-21
CN107683343A (zh) 2018-02-09
EP3303650A1 (de) 2018-04-11
DE102015108334B3 (de) 2016-11-24
ES2763351T3 (es) 2020-05-28
CN107683343B (zh) 2019-12-17

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