EP1203106B1 - Method and installation for hot dip galvanizing hot rolled steel strip - Google Patents

Method and installation for hot dip galvanizing hot rolled steel strip Download PDF

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Publication number
EP1203106B1
EP1203106B1 EP00958379A EP00958379A EP1203106B1 EP 1203106 B1 EP1203106 B1 EP 1203106B1 EP 00958379 A EP00958379 A EP 00958379A EP 00958379 A EP00958379 A EP 00958379A EP 1203106 B1 EP1203106 B1 EP 1203106B1
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European Patent Office
Prior art keywords
strip
station
hot
pickling
temperature
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EP00958379A
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German (de)
French (fr)
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EP1203106A2 (en
Inventor
Markus Reifferscheid
Rolf Brisberger
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SMS Siemag AG
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SMS Demag AG
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Priority claimed from DE19943238A external-priority patent/DE19943238A1/en
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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
    • C23C2/003—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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/19—Iron or steel
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
    • C23G3/029—Associated apparatus, e.g. for pretreating or after-treating for removing the pickling fluid from the objects

Definitions

  • the invention relates to a method and a system for hot dip galvanizing hot-rolled steel strip, the strip being in a first process step introduced into a pickling station and therein a layer of scale and reaction products be removed from the belt surface.
  • the belt is inserted into a rinsing station and the Belt surface washed away from residues of the pickling and pickling products, and then inserted into a drying station and dried in it.
  • the hot-dip coating in particular the hot-dip galvanizing of hot-rolled steel strip, so-called hot strip, is becoming more and more important economically compared to conventional cold-rolled strip coating.
  • hot strip Through the development of thin slab technology in hot strip, there is the technical possibility of producing hot strips in the thickness range below 1.2 mm from the casting heat. There is also the possibility, depending on customer requirements, to replace cold strip with comparatively cheaper hot strip.
  • the actual coating process is an annealing furnace upstream, in which at high temperatures a structural transformation to achieve the desired mechanical properties.
  • the existing one Temperature difference between molten bath, preferably zinc or Zinc alloys, and the maximum strip temperature can be up to 400 ° C. With this tape overheating, however, a fire coating is not feasible, which is why the tape cools down before coating Temperatures close to the melting bath temperature must be made.
  • Hot strip or pre-annealed cold strip do not require annealing in order to influence the mechanical properties, rather the Band temperature only adjusted to that of the melt pool to the desired Reaction of the steel strip surface with the alloy components to reach the weld pool. In contrast is a high temperature annealing often even disadvantageous for the mechanical properties of the belt.
  • the present invention relates exclusively to the process variants for hot strip hot finishing or hot strip hot galvanizing.
  • the desired temperature level lies with previously operated systems for fire coating still higher than the required 450 ° C of the zinc bath. reason for that is the required removal of all oxidation products and their precursors the steel strip surface. Oxidation products inevitably arise in the transition area from the pickling stage via the rinsing and drying stage into the oven entrance by exposure to atmospheric oxygen. The amount and training of in Oxidation products entering the furnace and those brought in from the belt Atmospheric oxygen determine the necessary process parameters of the treatment procedure, characterized by a required reduction potential, Temperature level and holding time. The temperature level used is often high so high that the strip is additionally cooled before entering the zinc bath must become.
  • Document WO 83/00885 discloses a metal band, of which the iron oxides were removed by reduction in a protective gas atmosphere, and its Temperature brought a little higher than the melting temperature of the zinc bath with the metal strip immersed in the conventional zinc bath becomes.
  • the bath contains mixed metal in a ratio between 0.01% and 0.5 % preferably between 0.02% and 0.08%.
  • the object of the invention based on specifying a method and a hot strip galvanizing plant, which overcomes the aforementioned disadvantages and difficulties and hot-dip galvanized with an economical outlay on material and operating costs Steel strip delivers high and flawless surface quality.
  • a corresponding plant for performing the method according to the invention accordingly provides that the outlet of the last rinsing stage of the rinsing station with the inlet of the dryer and its outlet with the inlet of the Furnace connected by locks and facing the surrounding Atmosphere are hermetically sealed.
  • the above-mentioned measures preserve the optimal strip condition after pickling into the oven and achieve an optimal setting of the strip temperature when immersed in the zinc bath.
  • the access of oxygen and the associated surface reactions, especially oxidation, are prevented.
  • This enables furnace operation at temperatures in the range of the melt bath temperature. Overheating of the belt and an extension of the holding time in the oven are not necessary. A belt cooler becomes superfluous.
  • the procedure according to the invention and the corresponding system allow a much more compact design of the furnace element and lower investment and operating costs.
  • furnace operation with lower H 2 contents in the protective gas is possible.
  • the disadvantages in the aforementioned conventional method with an increased zinc bath temperature are advantageously avoided.
  • the strip is namely set to a temperature which is at most 50 ° K higher than the immersion temperature in the zinc bath.
  • a strip 50 is transferred to a pickling station 10 introduced with three pickling stages 11 to 13 and in it a scale layer as well as reaction products removed from the belt surface.
  • a pickling station 10 usually pickling in the pickling station 10 or in the pickling stages 11, 12, 13 using hydrochloric acid (HCL).
  • HCL hydrochloric acid
  • the belt 50 is brought into the rinsing station 20 the rinse stages 21 to 23 introduced and therein the belt surface of residues the stain and the stain products exempt. Then the tape is in the drying station 30 inserted and dried therein. From there the tape 50 in a further method step into an oven 40, comprising a preheating stage 41 and an integrated temperature control stage 42, introduced and therein preferably heated to a tempering temperature in a protective gas atmosphere, and passed through a galvanizing bath in a last process step. The surface of the strip 50 is coated with a hot-dip galvanizing layer overdrawn.
  • a water-repellent or binding medium 25 is introduced into the rinsing stage 23.
  • NH 3 or a solution of NH 3 can be used as the medium.
  • a preferred embodiment of the method provides that the belt 50 is rinsed in the rinsing station 20 in the first stages 21, 22 with deionized water and in the third stage 23 with or with the addition of NH 3 as the drying medium.
  • the measures according to the invention maintain the optimum strip state after pickling into the tempering furnace because the introduction of atmospheric oxygen is prevented.
  • its design can be simplified due to the lower heating power required and the cooling section eliminated and can be realized with more favorable investment and operating costs. Oven operation is also possible with comparatively low H 2 contents in the protective gas.

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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)
  • General Chemical & Material Sciences (AREA)
  • Coating With Molten Metal (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

A method for hot dip galvanizing of hot-rolled steel strip, wherein in a first method step, the strip (50) is introduced into a pickling station (10-13) and a layer of scale and reaction products are removed from the strip surface in the pickling station. In another method step, the strip (50) is introduced into a rinsing station (21-23) and residues of the pickle and pickling products are removed from the strip surface in the rinsing station, and subsequently the strip is introduced into a drying station and is dried. And from there, in another method step, the strip is introduced into a furnace (40) and is adjusted to galvanizing temperature under a protective gas atmosphere. In a last method step, the strip is guided through a galvanizing bath and the surface of the (50) is coated with a hot dip galvanizing layer in the galvanizing bath, wherein the strip temperature in the furnace (40) is adjusted at most to 50° K. above immersion temperature of the strip (50) into the zinc bath.

Description

Die Erfindung betrifft ein Verfahren sowie eine Anlage zum Feuerverzinken von warmgewalztem Stahlband, wobei in einem ersten Verfahrensschritt das Band in eine Beizstation eingeführt und darin eine Zunderschicht sowie Reaktionsprodukte von der Bandoberfläche entfernt werden. In einem weiteren Verfahrensschritt wird das Band in eine Spülstation eingeführt und darin die Bandoberfläche von Rückständen der Beize und Beizprodukten freigespült, und anschließend in eine Trockenstation eingeführt und darin getrocknet. Von dort wird das Band in einem weiteren Verfahrensschritt in einen Ofen eingeführt und darin unter Schutzgasatmosphäre auf Verzinkungstemperatur eingestellt, und in einem letzten Verfahrensschritt durch ein Verzinkungsbad hindurchgeführt und dabei die Oberfläche des Bandes mit einer Feuerverzinkungsschicht überzogen, wobei die Bandtemperatur im Ofen maximal auf 50°K über Eintauchtemperatur in das Zinkbad eingestellt wird.The invention relates to a method and a system for hot dip galvanizing hot-rolled steel strip, the strip being in a first process step introduced into a pickling station and therein a layer of scale and reaction products be removed from the belt surface. In a further process step the belt is inserted into a rinsing station and the Belt surface washed away from residues of the pickling and pickling products, and then inserted into a drying station and dried in it. From there in a further process step, the strip is introduced into an oven and set in a protective gas atmosphere to the galvanizing temperature, and in a final process step through a galvanizing bath and the surface of the strip is coated with a hot-dip galvanizing layer, the belt temperature in the furnace is a maximum of 50 ° K above the immersion temperature is placed in the zinc bath.

Die Feuerbeschichtung, insbesondere die Feuerverzinkung von warmgewalzten Stahlband, sogenanntem Warmband, gewinnt gegenüber der herkömmlichen Kaltbandfeuerbeschichtung wirtschaftlich mehr und mehr an Bedeutung.
Durch Entwicklung der Dünnbrammentechnologie bei Warmband besteht die technische Möglichkeit, Warmbänder im Dickenbereich unter 1,2 mm aus der Gießhitze zu erzeugen. Es besteht damit ferner die Möglichkeit, Kaltband in Abhängigkeit der Kundenanforderungen durch vergleichsweise preisgünstigeres Warmband zu substituieren.The hot-dip coating, in particular the hot-dip galvanizing of hot-rolled steel strip, so-called hot strip, is becoming more and more important economically compared to conventional cold-rolled strip coating.
Through the development of thin slab technology in hot strip, there is the technical possibility of producing hot strips in the thickness range below 1.2 mm from the casting heat. There is also the possibility, depending on customer requirements, to replace cold strip with comparatively cheaper hot strip.

Für die Feuerbeschichtung, insbesondere das Feuerverzinken von Stahlbändern, sind unterschiedliche Verfahren und Anlagen bekannt. Hierbei handelt es sich überwiegend um Anlagentypen, bei denen kaltgewalzte Bänder zum Einsatz kommen.For hot-dip coating, especially hot-dip galvanizing steel strips, different processes and systems are known. This is what it is about are mainly plant types in which cold-rolled strips are used come.

In solchen Anlagen ist dem eigentlichen Beschichtungsprozess ein Glühofen vorgeschaltet, worin bei hohen Temperaturen eine Gefügeumwandlung zur Erzielung der gewünschten mechanischen Eigenschaften erfolgt. Der dabei vorhandene Temperaturunterschied zwischen Schmelzbad, bevorzugt Zink oder Zinklegierungen, und der maximalen Bandtemperatur kann bis zu 400° C betragen. Mit dieser Bandüberhitzung ist jedoch eine Feuerbeschichtung nicht durchführbar, weshalb eine Abkühlung des Bandes vor der Beschichtung auf Temperaturen nahe der Schmelzbadtemperatur vorgenommen werden muß.In such systems, the actual coating process is an annealing furnace upstream, in which at high temperatures a structural transformation to achieve the desired mechanical properties. The existing one Temperature difference between molten bath, preferably zinc or Zinc alloys, and the maximum strip temperature can be up to 400 ° C. With this tape overheating, however, a fire coating is not feasible, which is why the tape cools down before coating Temperatures close to the melting bath temperature must be made.

Warmband bzw. vorgeglühtes Kaltband bedürfen dagegen keiner Glühung zwecks Beeinflussung der mechanischen Eigenschaften, vielmehr wird die Bandtemperatur lediglich der des Schmelzbades angepasst, um die gewünschte Reaktion der Stahlbandoberfläche mit den Legierungsbestandteilen des Schmelzbades zu erreichen. Dagegen ist eine Hochtemperaturglühung oftmals für die mechanischen Eigenschaften des Bandes sogar von Nachteil.Hot strip or pre-annealed cold strip, however, do not require annealing in order to influence the mechanical properties, rather the Band temperature only adjusted to that of the melt pool to the desired Reaction of the steel strip surface with the alloy components to reach the weld pool. In contrast is a high temperature annealing often even disadvantageous for the mechanical properties of the belt.

Die vorliegende Erfindung betrifft exemplarisch ausschließlich die Verfahrensvarianten zur Warmband-Feuerveredelung bzw. Warmband-Feuerverzinkung.By way of example, the present invention relates exclusively to the process variants for hot strip hot finishing or hot strip hot galvanizing.

Das angestrebte Temperatumiveau, insbesondere bei der Warmband-Feuerverzinkung, liegt bei bisher betriebenen Anlagen zur Feuerbeschichtung immer noch höher, als die erforderlichen 450° C des Zinkbades. Grund dafür ist die erforderliche Entfernung aller Oxidationsprodukte und ihrer Vorstufen aus der Stahlbandoberfläche. Oxidationsprodukte entstehen zwangsläufig im Übergangsbereich aus der Beizstufe über Spül- und Trocknungsstufe in den Ofeneingang durch Einwirkung von Luftsauerstoff. Die Menge und Ausbildung der in den Ofen eintretenden Oxidationsprodukte und der vom Band eingeschleppte Luftsauerstoff bestimmen die notwendigen Verfahrensparameter der Behandlungsprozedur, gekennzeichnet durch ein erforderliches Reduktionspotential, Temperaturniveau und Haltezeit. Vielfach liegt das angewendete Temperatumiveau so hoch, dass das Band vor Eintritt in das Zinkbad noch zusätzlich gekühlt werden muss.The desired temperature level, especially for hot-dip hot-dip galvanizing, lies with previously operated systems for fire coating still higher than the required 450 ° C of the zinc bath. reason for that is the required removal of all oxidation products and their precursors the steel strip surface. Oxidation products inevitably arise in the transition area from the pickling stage via the rinsing and drying stage into the oven entrance by exposure to atmospheric oxygen. The amount and training of in Oxidation products entering the furnace and those brought in from the belt Atmospheric oxygen determine the necessary process parameters of the treatment procedure, characterized by a required reduction potential, Temperature level and holding time. The temperature level used is often high so high that the strip is additionally cooled before entering the zinc bath must become.

Eine andere Arbeitsweise ist durch eine signifikante Erhöhung des Temperaturniveaus im Zinkbad auf Werte oberhalb von 460° C gekennzeichnet. Besonders nachteilig bei dieser Verfahrensführung ist der erhöhte Anfall an zinkhaltiger Schlacke. Dies führt einerseits zu erhöhten Material- und Betriebskosten für das Zinkbad, sowie andererseits zu qualitativen Einbußen am Band.Another way of working is by significantly increasing the temperature level marked in the zinc bath to values above 460 ° C. Especially a disadvantage of this procedure is the increased occurrence of zinc-containing Slag. On the one hand, this leads to increased material and operating costs for the Zinc bath, as well as loss of quality on the assembly line.

Der dokumentarisch belegte Stand der Technik zeigt darüber hinaus Folgendes:

  • Das Dokument US 4,143,183 beschreibt bei einem Verfahren zum kontinuierlichen Galvanisieren eines Stahlbandes die folgenden Schritte:
    • Vorheizen bis zu einer Temperatur, die geeignet ist zum Erreichen erwünschter mechanischer Eigenschaften des Bandes. Die Vorheiztemperatur wird zwischen 400° C und 950° C eingestellt. Abschrecken des Bandes in einem wässrigen Bad bei dessen Siedetemperatur. Herausnehmen des Bandes aus dem Bad. Dabei soll eine Oxydschicht von weniger als 2 g/m2 ausgebildet sein. Eliminieren der Oxydschicht von wenigstens einem Oberflächenbereich des Bandes und Einstellen der Temperatur im Bereich von 420° und 550° C und Aufrechterhalten dieser Temperatur.
    • The documented state of the art also shows the following:
  • The document US 4,143,183 describes the following steps in a method for the continuous electroplating of a steel strip:
    • Preheat to a temperature suitable for achieving the desired mechanical properties of the belt. The preheating temperature is set between 400 ° C and 950 ° C. Quench the tape in an aqueous bath at its boiling temperature. Take the tape out of the bathroom. An oxide layer of less than 2 g / m 2 should be formed. Eliminate the oxide layer from at least one surface area of the tape and adjust the temperature in the range of 420 ° and 550 ° C and maintain that temperature.

    • Das Dokument WO 83/00885 offenbart ein Metallband, von dem die Eisenoxyde durch Reduktion in einer Schutzgasatmosphäre entfernt wurden, und dessen Temperatur ein wenig höher als die Schmelztemperatur des Zinkbades gebracht wurde, wobei das Metallband in das konventionelle Zinkbad eingetaucht wird. Das Bad enthält Mischmetall in einem Verhältnis zwischen 0,01 % und 0,5 % vorzugsweise zwischen 0,02 % und 0,08 %.Document WO 83/00885 discloses a metal band, of which the iron oxides were removed by reduction in a protective gas atmosphere, and its Temperature brought a little higher than the melting temperature of the zinc bath with the metal strip immersed in the conventional zinc bath becomes. The bath contains mixed metal in a ratio between 0.01% and 0.5 % preferably between 0.02% and 0.08%.

    Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren und eine Warmbandverzinkungsanlage anzugeben, welche die vorbezeichneten Nachteile und Schwierigkeiten überwindet und mit einem ökonomischen Aufwand an Material- und Betriebskosten feuerverzinktes Stahlband von hoher und fehlerloser Oberflächenqualität liefert.Starting from the aforementioned prior art, the object of the invention based on specifying a method and a hot strip galvanizing plant, which overcomes the aforementioned disadvantages and difficulties and hot-dip galvanized with an economical outlay on material and operating costs Steel strip delivers high and flawless surface quality.

    Zur Lösung der Aufgabe wird bei einem Verfahren der im Oberbegriff von Anspruch 1 genannten Art mit der Erfindung vorgeschlagen, dass die Verfahrensschritte zwischen der letzten Spülstufe der Spülstation über die Trockenstation bis hin zum Einlass des Ofens unter hermetischer Abschirmung gegen Luft und Sauerstoff aus der Umgebung durchgeführt werden.To solve the problem is in a method in the preamble of claim 1 mentioned type with the invention that the method steps between the last rinsing stage of the rinsing station via the drying station to the inlet of the furnace under hermetic shielding against air and Oxygen can be carried from the environment.

    Eine entsprechende Anlage zur Durchführung des Verfahrens nach der Erfindung sieht demgemäß vor, dass der Auslass der letzten Spülstufe der Spülstation mit dem Einlass des Trockners und dessen Auslass mit dem Einlass des Ofens durch Schleusen miteinander verbunden und gegenüber der umgebenden Atmosphäre hermetisch abgedichtet sind.A corresponding plant for performing the method according to the invention accordingly provides that the outlet of the last rinsing stage of the rinsing station with the inlet of the dryer and its outlet with the inlet of the Furnace connected by locks and facing the surrounding Atmosphere are hermetically sealed.

    Weitere zweckmäßige Ausgestaltungen einerseits des Verfahrens und andererseits der Warmbandverzinkungsanlage sind entsprechend den Merkmalen von Unteransprüchen vorgesehen.Further expedient refinements of the method on the one hand and on the other hand the hot strip galvanizing plant are in accordance with the characteristics of Subclaims provided.

    Mit Vorteil wird durch das Verfahren und durch die Anlage nach der Erfindung sichergestellt, dass der nach Durchlauf des Bandes durch die Beizstation und Spülstation erreichte optimale Oberflächenzustand des Bandes in der anschließenden Trocknungsstufe sowie beim Übergang in den Ofenbereichen und aus diesem in das Verzinkungsbad konserviert wird.
    Dies wird erreicht durch:

    • direkte Kopplung zumindest der letzten Spülstufe der Spülstation über die Trocknungsstufe mit dem Ofeneingang unter Abschirmung von Luftsauerstoff,
    • Auftragen eines wasserbindenden Mediums, bevorzugt NH3, oder einer Lösung davon, auf das Band in der Spülstufe, wonach sich in der anschließenden Trocknungsstufe das wasserbindende Medium schnell und rückstandsfrei, das heißt ohne Eintrag von Sauerstoff oder flüssiges Reinigungsmedium vom Band entfernen lässt,
    • alternativ durch einen Betrieb der Trockenstufe mit einer reduzierend wirkenden Atmosphäre, zum Beispiel N2/H2-Gasgemisch.
    Advantageously, the method and the system according to the invention ensure that the optimal surface condition of the strip which has been achieved after the strip has passed through the pickling station and rinsing station is preserved in the subsequent drying stage and during the transition in the furnace areas and from there into the galvanizing bath.
    This is achieved through:
    • direct coupling of at least the last rinsing stage of the rinsing station via the drying stage to the oven entrance with shielding from atmospheric oxygen,
    • Applying a water-binding medium, preferably NH 3 , or a solution thereof, to the belt in the rinsing stage, after which the water-binding medium can be removed from the belt quickly and without residue in the subsequent drying stage, that is to say without oxygen or liquid cleaning medium being introduced,
    • alternatively by operating the drying stage with a reducing atmosphere, for example N 2 / H 2 gas mixture.

    Durch vorgenannte Maßnahmen wird der optimale Bandzustand nach dem Beizen bis in den Ofen konserviert und eine optimale Einstellung der Bandtemperatur beim Eintauchen in das Zinkbad erreicht. Der Zutritt von Sauerstoff und die damit verbundenen Oberflächenreaktionen, insbesondere Oxidation, sind unterbunden. Dies ermöglicht den Ofenbetrieb bei Temperaturen im Bereich der Schmelzbadtemperatur. Eine Überhitzung des Bandes und eine Verlängerung der Haltezeit im Ofen entfallen. Ein Bandkühler wird überflüssig. Insgesamt erlaubt die Vorgehensweise nach der Erfindung und die entsprechende Anlage eine wesentlich kompaktere Bauweise des Ofenelements und niedrigere Investitions- und Betriebskosten. Zugleich ist der Ofenbetrieb mit niedrigeren H2-Gehalten im Schutzgas möglich. Die Nachteile bei dem vorgenannten konventionellen Verfahren mit erhöhter Zinkbadtemperatur werden vorteilhaft vermieden.
    Erfindungsgemäß wird nämlich das Band auf eine Temperatur eingestellt, die maximal 50 °K höher liegt, als die Eintauchtemperatur in das Zinkbad.    The above-mentioned measures preserve the optimal strip condition after pickling into the oven and achieve an optimal setting of the strip temperature when immersed in the zinc bath. The access of oxygen and the associated surface reactions, especially oxidation, are prevented. This enables furnace operation at temperatures in the range of the melt bath temperature. Overheating of the belt and an extension of the holding time in the oven are not necessary. A belt cooler becomes superfluous. Overall, the procedure according to the invention and the corresponding system allow a much more compact design of the furnace element and lower investment and operating costs. At the same time, furnace operation with lower H 2 contents in the protective gas is possible. The disadvantages in the aforementioned conventional method with an increased zinc bath temperature are advantageously avoided.
    According to the invention, the strip is namely set to a temperature which is at most 50 ° K higher than the immersion temperature in the zinc bath.

    Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in den Zeichnungen schematisch dargestellten Ausführungsbeispieles. Es zeigen:

    Figur 1
    ein Layout einer Feuerverzinkungsanlage nach dem Stand der Technik,
    Figur 2
    ein Layout einer Feuerverzinkungsanlage nach der Erfindung.
    Further details, features and advantages of the invention result from the following explanation of an exemplary embodiment shown schematically in the drawings. Show it:
    Figure 1
    a layout of a hot-dip galvanizing plant according to the prior art,
    Figure 2
    a layout of a hot-dip galvanizing plant according to the invention.

    Gemäß dem in Figur 1 gezeigten Layout einer konventionellen Feuerverzinkungsanlage wird in einem ersten Verfahrensschritt ein Band 50 in eine Beizstation 10 mit drei Beizstufen 11 bis 13 eingeführt und darin eine Zunderschicht sowie Reaktionsprodukte von der Bandoberfläche entfernt. Üblicherweise wird das Beizen in der Beizstation 10 bzw. in den Beizstufen 11, 12, 13 mittels Salzsäure (HCL) vorgenommen.According to the layout of a conventional hot-dip galvanizing plant shown in FIG in a first process step, a strip 50 is transferred to a pickling station 10 introduced with three pickling stages 11 to 13 and in it a scale layer as well as reaction products removed from the belt surface. Usually pickling in the pickling station 10 or in the pickling stages 11, 12, 13 using hydrochloric acid (HCL).

    In dem folgenden Verfahrensschritt wird das Band 50 in die Spülstation.20 mit den Spülstufen 21 bis 23 eingeführt und darin die Bandoberfläche von Rückständen der Beize und der Beizprodukte befreit. Anschließend wird das Band in die Trockenstation 30 eingeführt und darin getrocknet. Von dort wird das Band 50 in einem weiteren Verfahrensschritt in einen Ofen 40, umfassend eine Vorwärmstufe 41 sowie eine integrierte Temperierstufe 42, eingeführt und darin bevorzugt unter Schutzgasatmosphäre bis auf Veizinkungstemperatur erwärmt, und in einem letzten Verfahrensschritt durch ein Verzinkungsbad hindurchgeführt. Dabei wird die Oberfläche des Bandes 50 mit einer Feuerverzinkungsschicht überzogen.In the following process step, the belt 50 is brought into the rinsing station 20 the rinse stages 21 to 23 introduced and therein the belt surface of residues the stain and the stain products exempt. Then the tape is in the drying station 30 inserted and dried therein. From there the tape 50 in a further method step into an oven 40, comprising a preheating stage 41 and an integrated temperature control stage 42, introduced and therein preferably heated to a tempering temperature in a protective gas atmosphere, and passed through a galvanizing bath in a last process step. The surface of the strip 50 is coated with a hot-dip galvanizing layer overdrawn.

    Im Gegensatz zur konventionellen Verzinkungsanlage nach Figur 1 werden nach dem erfindungsgemäßen Layout der Feuerverzinkungsanlage gemäß Figur 2 die Verfahrensschritte zwischen der letzten Spülstufe 23 der Spülstation 20 über die Trockenstation 30 bis hin zum Einlaß 43 des Temperierofens 40 unter hermetischer Abschirmung von Luftsauerstoff aus der Umgebung ausgeführt.In contrast to the conventional galvanizing plant according to Figure 1 according to the layout of the hot-dip galvanizing plant according to the invention according to FIG 2 the process steps between the last rinsing stage 23 of the rinsing station 20 via the drying station 30 to the inlet 43 of the tempering furnace 40 carried out under hermetic shielding of atmospheric oxygen from the environment.

    Unter Erweiterung der Spülstation 20 um eine Spülstufe 23 bzw. durch Abschotten der Spülstufe 23 mit Hilfe einer Trennwand 24 von den vorhergehenden Spülstufen 21, 22 wird ein wasserabweisendes bzw. -bindendes Medium 25 in die Spülstufe 23 eingegeben. Als Medium kann beispielsweise NH3, oder eine Lösung von NH3 verwendet werden.By expanding the rinsing station 20 by a rinsing stage 23 or by partitioning the rinsing stage 23 with the aid of a partition 24 from the previous rinsing stages 21, 22, a water-repellent or binding medium 25 is introduced into the rinsing stage 23. For example, NH 3 or a solution of NH 3 can be used as the medium.

    Eine vorzugsweise Ausgestaltung des Verfahrens sieht vor, daß die Spülung des Bandes 50 in der Spülstation 20 in den ersten Stufen 21, 22 mit deionisiertem Wasser und in der dritten Stufe 23 mit oder unter Zusatz von NH3 als Trocknuhgsmedium durchgeführt wird.A preferred embodiment of the method provides that the belt 50 is rinsed in the rinsing station 20 in the first stages 21, 22 with deionized water and in the third stage 23 with or with the addition of NH 3 as the drying medium.

    Die Trocknung des Bandes 50 in der Trockenstation 30 erfolgt ohne Luftzufuhr. Erfindungsgemäß wird die Trocknung mittels Wärmestrahlung unter Zusatz einer Mischung von Stickstoff-, Wasserstoff- und Ammoniakgas (N2/NH3) bzw. H2 durchgeführt.The belt 50 is dried in the drying station 30 without air being supplied. According to the invention, drying is carried out by means of heat radiation with the addition of a mixture of nitrogen, hydrogen and ammonia gas (N 2 / NH 3 ) or H 2 .

    Die Trockenstation 30 ist beiderseits mit Schleusen 70, 80 im Anschluß an die benachbarten Stationen 20 und 40 hermetisch gegen Zutritt von Luftsauerstoff abgeschlossen, wobei der Auslaß der letzten Spülstufe 23 der Spülstation 20 mit dem Einlaß der Trockenstation 30 und dessen Auslaß mit dem Einlaß 43 des Temperierofens 40 durch Schleusen 70, 80 miteinander verbunden und gegenüber der umgebenden Atmosphäre hermetisch abgedichtet sind. The drying station 30 is on both sides with locks 70, 80 following the neighboring stations 20 and 40 hermetically against the entry of atmospheric oxygen completed, the outlet of the last rinsing stage 23 of the rinsing station 20 with the inlet of the drying station 30 and its outlet with the inlet 43 of the tempering furnace 40 connected by locks 70, 80 and are hermetically sealed from the surrounding atmosphere.

    Durch die erfindungsgemäßen Maßnahmen wird der optimale Bandzustand nach dem Beizen bis in den Temperierofen erhalten, weil das Einschleppen von Luftsauerstoff unterbunden wird. Infolgedessen kann, wie dies der Darstellung des Temperierofens 40 in Figur 2 zu entnehmen ist, dessen Bauart aufgrund der niedrigeren erforderlichen Heizleistung und Wegfall der Kühlstrecke vereinfacht und mit günstigeren Investitions- und Betriebskosten realisiert werden. Der Ofenbetrieb ist zudem mit vergleichsweise niedrigen H2-Gehalten im Schutzgas möglich.The measures according to the invention maintain the optimum strip state after pickling into the tempering furnace because the introduction of atmospheric oxygen is prevented. As a result, as can be seen from the illustration of the tempering furnace 40 in FIG. 2, its design can be simplified due to the lower heating power required and the cooling section eliminated and can be realized with more favorable investment and operating costs. Oven operation is also possible with comparatively low H 2 contents in the protective gas.

    Claims (6)

    1. Method of hot-galvanising hot-rolled steel strip, wherein:
      in a first step the strip (50) is introduced into a pickling station (10-13) and a scale layer as well as reaction products are removed from the strip surface,
      in a further step the strip (50) is introduced into a washing station (21-23) and the strip surface is freed therein from residues of the pickling and pickling products, and subsequently
      the strip is introduced and dried in a drying station and from there
      introduced in a further step into an oven (40) and adjusted therein to galvanising temperature under a protective gas atmosphere, and
      in a last step the strip is conducted through a galvanising bath and the strip surface (50) is then covered with a hot-galvanising layer, wherein the strip temperature in the oven (50) is set to at most 50° K above immersion temperature in the zinc bath,
      characterised in that the method steps between the last washing stage (23) of the washing station (20) through the drying station (20) up to the inlet (43) of the oven (40) are carried out with hermetic shielding against air and oxygen from the environment.
    2. Method according to claim 1, characterised in that in the last washing stage (23) of the washing station (20) a water-repelling or water-binding medium (25) wetting the strip (50) is fed.
    3. Method according to claim 2, characterised in that the medium (25) fed in the third washing stage (23) is NH3 or a solution containing NH3.
    4. Method according to one or more of claims 1 to 3, characterised in that the drying of the strip (50) in the drying station (30) is carried out without feed of air from the outside by means of heat radiation with addition of a mixture of nitrogen, hydrogen and ammonia gas (N2/NH3) + H2 or a mixture of two of the said gases.
    5. Hot strip galvanising plant, comprising a pickling station (10), a washing station (20), a drier (30), an oven (40) as well as a downstream hot-galvanising bath (60), characterised in that the outlet of the last washing stage (23) of the washing station (20) is connected with the inlet of the drier (39), and the outlet thereof is connected with the inlet (43) of the furnace (40), by locks (70, 80) and are hermetically sealed off relative to the ambient atmosphere.
    6. Plant according to claim 5, characterised in that the washing stages (21, 23) and the heating stages (41) or the temperature-controlling stage (42) are partitioned off relative to one another by intermediate walls (24).
    EP00958379A 1999-08-06 2000-08-04 Method and installation for hot dip galvanizing hot rolled steel strip Expired - Lifetime EP1203106B1 (en)

    Applications Claiming Priority (5)

    Application Number Priority Date Filing Date Title
    DE19937216 1999-08-06
    DE19937216 1999-08-06
    DE19943238 1999-09-10
    DE19943238A DE19943238A1 (en) 1999-08-06 1999-09-10 Process and plant for hot-dip galvanizing hot-rolled steel strip
    PCT/EP2000/007582 WO2001011099A2 (en) 1999-08-06 2000-08-04 Method and installation for hot dip galvanizing hot rolled steel strip

    Publications (2)

    Publication Number Publication Date
    EP1203106A2 EP1203106A2 (en) 2002-05-08
    EP1203106B1 true EP1203106B1 (en) 2004-03-17

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    Application Number Title Priority Date Filing Date
    EP00958379A Expired - Lifetime EP1203106B1 (en) 1999-08-06 2000-08-04 Method and installation for hot dip galvanizing hot rolled steel strip

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    US (1) US6761936B1 (en)
    EP (1) EP1203106B1 (en)
    JP (1) JP2003506573A (en)
    CN (1) CN1201029C (en)
    AT (1) ATE262049T1 (en)
    AU (1) AU777644B2 (en)
    BR (1) BR0012961A (en)
    CA (1) CA2381247C (en)
    EG (1) EG22474A (en)
    ES (1) ES2216948T3 (en)
    MX (1) MXPA02001283A (en)
    TR (1) TR200200323T2 (en)
    TW (1) TW500827B (en)
    WO (1) WO2001011099A2 (en)

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    Publication number Priority date Publication date Assignee Title
    EP1538233A1 (en) * 2002-09-13 2005-06-08 JFE Steel Corporation Method and apparatus for producing hot-dip coated metal belt
    DE102005013103A1 (en) 2005-03-18 2006-09-28 Sms Demag Ag Controlled thickness reduction in hot-dip coated hot rolled steel strip and equipment used in this case
    DE102008005605A1 (en) * 2008-01-22 2009-07-23 Thyssenkrupp Steel Ag Process for coating a 6-30% by weight Mn-containing hot or cold rolled flat steel product with a metallic protective layer
    CN103060829B (en) * 2013-01-31 2015-03-11 汕尾市栢林电子封装材料有限公司 Device for removing oxide on metal band surface
    TWI480422B (en) * 2013-10-07 2015-04-11 China Steel Corp A device and method for cleaning the mouth of a zinc tank
    EP2927343A1 (en) 2014-03-31 2015-10-07 Primetals Technologies Austria GmbH Installation and method for pickling and metal coating of a metal strip
    CN108265252B (en) * 2018-01-19 2020-10-09 河北工业大学 Environment-friendly hot-dip coating method
    CN108823584A (en) * 2018-07-09 2018-11-16 宁波甬凌新材料科技有限公司 A kind of pickling drying pretreating device for metal plate hot galvanizing

    Family Cites Families (8)

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    Publication number Priority date Publication date Assignee Title
    LU77032A1 (en) * 1976-04-01 1977-07-22
    BE890256A (en) 1981-09-07 1982-03-08 Centre Rech Metallurgique IMPROVEMENTS IN GALVANIZING PROCESSES FOR STEEL SHEETS OR STRIPS
    JPS6179755A (en) 1984-09-28 1986-04-23 Nisshin Steel Co Ltd Continuous plating device in common use for hot dipping and vacuum deposition plating
    US4814210A (en) * 1984-11-09 1989-03-21 Werner Ackermann Process and means for hot-dip galvanizing finned tubes
    US5284680A (en) * 1992-04-27 1994-02-08 Inland Steel Company Method for producing a galvanized ultra-high strength steel strip
    CA2142096C (en) * 1993-06-25 2000-10-03 Makoto Isobe Method of hot-dip-zinc-plating high-tension steel plate reduced in unplated portions
    DE4433946A1 (en) * 1994-09-23 1996-03-28 Henkel Kgaa Phosphating process without rinsing
    DE69723782T2 (en) * 1996-02-22 2004-04-15 Sumitomo Metal Industries, Ltd. Annealed steel sheet and process for its manufacture

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    WO2001011099A2 (en) 2001-02-15
    TR200200323T2 (en) 2002-06-21
    MXPA02001283A (en) 2002-08-12
    EP1203106A2 (en) 2002-05-08
    CA2381247A1 (en) 2001-02-15
    US6761936B1 (en) 2004-07-13
    CN1201029C (en) 2005-05-11
    ES2216948T3 (en) 2004-11-01
    CN1420942A (en) 2003-05-28
    CA2381247C (en) 2009-02-03
    JP2003506573A (en) 2003-02-18
    AU777644B2 (en) 2004-10-28
    WO2001011099A3 (en) 2001-09-07
    TW500827B (en) 2002-09-01
    EG22474A (en) 2003-02-26
    ATE262049T1 (en) 2004-04-15
    BR0012961A (en) 2002-04-30
    AU6992300A (en) 2001-03-05

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