EP1203106A2 - Method and installation for hot dip galvanizing hot rolled steel strip - Google Patents

Method and installation for hot dip galvanizing hot rolled steel strip

Info

Publication number
EP1203106A2
EP1203106A2 EP00958379A EP00958379A EP1203106A2 EP 1203106 A2 EP1203106 A2 EP 1203106A2 EP 00958379 A EP00958379 A EP 00958379A EP 00958379 A EP00958379 A EP 00958379A EP 1203106 A2 EP1203106 A2 EP 1203106A2
Authority
EP
European Patent Office
Prior art keywords
strip
station
hot
rinsing
galvanizing
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.)
Granted
Application number
EP00958379A
Other languages
German (de)
French (fr)
Other versions
EP1203106B1 (en
Inventor
Markus Reifferscheid
Rolf Brisberger
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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
Priority claimed from DE19943238A external-priority patent/DE19943238A1/en
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1203106A2 publication Critical patent/EP1203106A2/en
Application granted granted Critical
Publication of EP1203106B1 publication Critical patent/EP1203106B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 introduced into a pickling station in a first process step and a scale layer and reaction products being removed therein from the strip surface.
  • the strip is introduced into a rinsing station and the strip surface is rinsed free of residues of the pickling and pickling products, and then introduced into a drying station and dried therein.
  • the strip is introduced into a furnace in a further process step and set therein to the galvanizing temperature under a protective gas atmosphere, and in a last process step is passed through a galvanizing bath and the surface of the strip is coated with a hot-dip galvanizing layer.
  • 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.
  • hot-dip coating in particular hot-dip galvanizing of steel strips. These are predominantly plant types in which cold-rolled strips are used.
  • the actual coating process is preceded by an annealing furnace, in which a structural transformation takes place at high temperatures in order to achieve the desired mechanical properties.
  • the temperature difference between the molten bath, preferably zinc or zinc alloys, and the maximum strip temperature can be up to 400 ° C. With this strip overheating, however, a fire coating cannot be carried out, which is why the strip must be cooled to temperatures close to the melting bath temperature before the coating.
  • Hot strip or pre-annealed cold strip do not require annealing in order to influence the mechanical properties, rather the strip temperature is only adapted to that of the melting bath in order to achieve the desired reaction of the steel strip surface with the alloy components of the melting bath. In contrast, high-temperature annealing is often even disadvantageous for the mechanical properties of the strip.
  • the present invention relates, by way of example only, to the process variants for hot strip hot finishing or hot strip hot galvanizing.
  • the desired temperature level, especially in hot strip hot-dip galvanizing, is still higher than the required 450 ° C of the zinc bath in previously operated systems for hot-dip coating.
  • the reason for this is the need to remove all oxidation products and their precursors from the steel strip surface. Oxidation products inevitably arise in the transition area from the pickling stage through the rinsing and drying stage to the entrance to the furnace due to the action of atmospheric oxygen.
  • the quantity and formation of the oxidation products entering the furnace and the atmospheric oxygen carried in by the belt determine the necessary process parameters of the treatment procedure, characterized by a required reduction potential, temperature level and holding time. In many cases, the temperature level used is so high that the strip must be additionally cooled before it enters the zinc bath.
  • Another way of working is characterized by a significant increase in the temperature level in the zinc bath to values above 460 ° C.
  • the increased amount of zinc-containing slag is particularly disadvantageous in this process. This leads on the one hand to increased material and operating costs for the zinc bath, and on the other hand to a loss of quality on the assembly line.
  • the invention has for its object to provide a method and a hot strip galvanizing plant which overcomes the aforementioned disadvantages and difficulties and delivers hot-dip galvanized steel strip of high and flawless surface quality with an economical outlay on material and operating costs.
  • the strip temperature in the furnace is set to a maximum of 50 ° K above the immersion temperature in the zinc bath.
  • the H 2 concentration in the furnace is advantageously increased to max. 20% preferably set to less than 5%. It is expedient that the process steps between the last rinsing stage of the rinsing station and the drying station up to the inlet of the temperature control oven are carried out with hermetic shielding of atmospheric oxygen from the environment.
  • a corresponding system for carrying out the method according to the invention accordingly provides that the outlet of the last rinsing stage of the rinsing station is connected to the inlet of the dryer and its outlet to the inlet of the oven by means of locks and is hermetically sealed from the surrounding atmosphere.
  • the method and the system according to the invention ensure that the optimum surface condition of the strip, which is 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 this into the galvanizing bath. This is achieved through:
  • 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 residues in the subsequent drying stage, that is to say without oxygen or liquid cleaning medium being introduced,
  • the above-mentioned measures preserve the optimal strip condition after pickling into the oven and achieve the optimum strip temperature setting 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 investments. Station 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.
  • the strip is set to a temperature which is at most 50 ° K higher than the immersion temperature in the zinc bath.
  • Figure 2 shows a layout of a hot dip galvanizing plant according to the invention.
  • a strip 50 is introduced into a pickling station 10 with three pickling stages 11 to 13 in a first process step and a scale layer and reaction products are removed from the strip surface.
  • the pickling is usually carried out in the pickling station 10 or in the pickling stages 11, 12, 13 using hydrochloric acid (HCL).
  • HCL hydrochloric acid
  • the strip 50 is introduced into the rinsing station 20 with the rinsing stages 21 to 23 and the strip surface is freed of residues of the pickling and the pickling products.
  • the tape is then introduced into the drying station 30 and dried therein.
  • the strip 50 is introduced in a further process step into an oven 40, comprising a preheating stage 41 and an integrated temperature control stage 42, and is preferably heated therein to the galvanizing temperature in a protective gas atmosphere, and in a last process step through a galvanizing bath. leads.
  • the surface of the strip 50 is coated with a hot-dip galvanizing layer.
  • the process steps between the last rinsing stage 23 of the rinsing station 20 via the drying station 30 and the inlet 43 of the tempering furnace 40 are carried out with hermetic shielding of atmospheric oxygen from the environment.
  • 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 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 .
  • the drying station 30 is hermetically sealed on both sides with locks 70, 80 following the neighboring stations 20 and 40 against the entry of atmospheric oxygen, 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 are connected to one another by locks 70, 80 and are hermetically sealed from the surrounding atmosphere.
  • 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 output 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.

Landscapes

  • 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

The invention relates to a method for hot dip galvanizing hot rolled steel strip and to a hot rolled strip galvanizing installation. In a first method step, the strip (50) to be galvanized is introduced into a pickling station (10) inside of which the layer of scale as well as reaction products are removed from the surface of the strip. In a subsequent working step, the strip (50) is introduced into a rinsing station (20) in which residual pickle and pickle products are removed from the surface of the strip. Afterwards, the strip (50) is introduced into a drying station (30) and dried therein. From there, the strip (50) is introduced, in another method step, into a furnace (40) in which it is heated, under a protective gas atmosphere, up to a galvanizing temperature. In a final method step, the strip is guided through a galvanizing bath in which it is coated with a hot dip galvanizing layer. This method is improved in such a way that the strip (50) is heated in the furnace (40) to a temperature that does not exceed the bath dipping temperature in the zinc bath by more than 50 °K.

Description

Verfahren und Anlage zum Feuerverzinken von warmgewalztem StahlbandProcess and plant for hot-dip galvanizing hot-rolled steel strip
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.The invention relates to a method and a system for hot-dip galvanizing hot-rolled steel strip, the strip being introduced into a pickling station in a first process step and a scale layer and reaction products being removed therein from the strip surface. In a further process step, the strip is introduced into a rinsing station and the strip surface is rinsed free of residues of the pickling and pickling products, and then introduced into a drying station and dried therein. From there, the strip is introduced into a furnace in a further process step and set therein to the galvanizing temperature under a protective gas atmosphere, and in a last process step is passed through a galvanizing bath and the surface of the strip is coated with a hot-dip galvanizing layer.
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. 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.Different methods and systems are known for hot-dip coating, in particular hot-dip galvanizing of steel strips. These are predominantly plant types in which cold-rolled strips are used. In such systems, the actual coating process is preceded by an annealing furnace, in which a structural transformation takes place at high temperatures in order to achieve the desired mechanical properties. The temperature difference between the molten bath, preferably zinc or zinc alloys, and the maximum strip temperature can be up to 400 ° C. With this strip overheating, however, a fire coating cannot be carried out, which is why the strip must be cooled to temperatures close to the melting bath temperature before the coating.
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, on the other hand, do not require annealing in order to influence the mechanical properties, rather the strip temperature is only adapted to that of the melting bath in order to achieve the desired reaction of the steel strip surface with the alloy components of the melting bath. In contrast, high-temperature annealing is often even disadvantageous for the mechanical properties of the strip.
Die vorliegende Erfindung betrifft exemplarisch ausschließlich die Verfahrensvarianten zur Warmband-Feuerveredelung bzw. Warmband-Feuerverzinkung.The present invention relates, by way of example only, to the process variants for hot strip hot finishing or hot strip hot galvanizing.
Das angestrebte Temperaturniveau, insbesondere bei der Warmbandfeuerver- zinkung, 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 Trockungsstufe 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 Temperaturniveau so hoch, daß das Band vor Eintritt in das Zinkbad noch zusätzlich gekühlt werden muß. 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.The desired temperature level, especially in hot strip hot-dip galvanizing, is still higher than the required 450 ° C of the zinc bath in previously operated systems for hot-dip coating. The reason for this is the need to remove all oxidation products and their precursors from the steel strip surface. Oxidation products inevitably arise in the transition area from the pickling stage through the rinsing and drying stage to the entrance to the furnace due to the action of atmospheric oxygen. The quantity and formation of the oxidation products entering the furnace and the atmospheric oxygen carried in by the belt determine the necessary process parameters of the treatment procedure, characterized by a required reduction potential, temperature level and holding time. In many cases, the temperature level used is so high that the strip must be additionally cooled before it enters the zinc bath. Another way of working is characterized by a significant increase in the temperature level in the zinc bath to values above 460 ° C. The increased amount of zinc-containing slag is particularly disadvantageous in this process. This leads on the one hand to increased material and operating costs for the zinc bath, and on the other hand to a loss of quality on the assembly line.
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 invention has for its object to provide a method and a hot strip galvanizing plant which overcomes the aforementioned disadvantages and difficulties and delivers hot-dip galvanized steel strip of high and flawless surface quality with an economical outlay on material and operating costs.
Zur Lösung der Aufgabe wird bei einem Verfahren der im Oberbegriff von Anspruch 1 genannten Art mit der Erfindung vorgeschlagen, daß die Bandtemperatur im Ofen maximal auf 50 °K über Eintauchtemperatur in's Zinkbad eingestellt wird.To achieve the object is proposed in a method of the type mentioned in the preamble of claim 1 with the invention that the strip temperature in the furnace is set to a maximum of 50 ° K above the immersion temperature in the zinc bath.
Vorteilhafterweise wird die H2-Konzentration im Ofen auf max. 20 % vorzugsweise auf weniger als 5 % eingestellt. Zweckmäßig ist, daß die Verfahrensschritte zwischen der letzten Spülstufe der Spülstation über die Trockenstation bis hin zum Einlaß des Temperierofens unter hermetischer Abschirmung von Luftsauerstoff aus der Umgebung durchgeführt werden.The H 2 concentration in the furnace is advantageously increased to max. 20% preferably set to less than 5%. It is expedient that the process steps between the last rinsing stage of the rinsing station and the drying station up to the inlet of the temperature control oven are carried out with hermetic shielding of atmospheric oxygen 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 system for carrying out the method according to the invention accordingly provides that the outlet of the last rinsing stage of the rinsing station is connected to the inlet of the dryer and its outlet to the inlet of the oven by means of locks and is hermetically sealed from the surrounding atmosphere.
Weitere zweckmäßige Ausgestaltungen einerseits des Verfahrens und andererseits der Warmbandverzinkungsanlage sind entsprechend den Merkmalen von Unteransprüchen vorgesehen. 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:Further expedient refinements of the method on the one hand and the hot strip galvanizing system on the other hand are provided in accordance with the features of the subclaims. Advantageously, the method and the system according to the invention ensure that the optimum surface condition of the strip, which is 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 this into the galvanizing bath. This is achieved through:
die vorgenannte Einstellung der Temperatur des Bandes im Ofen,the aforementioned setting of the temperature of the belt in the furnace,
direkte Kopplung zumindest der letzten Spülstufe der Spülstation über die Trocknungsstufe mit dem Ofeneingang unter Abschirmung von Luftsauerstoff,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,
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,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 residues in the subsequent drying stage, that is to say without oxygen or liquid cleaning medium being introduced,
alternativ durch einen Betrieb der Trockenstufe mit einer reduzierend wirkenden Atmosphäre, zum Beispiel N2/H2-Gasgemisch.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 Inve- stitions- 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.The above-mentioned measures preserve the optimal strip condition after pickling into the oven and achieve the optimum strip temperature setting 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 investments. Station 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.
Erfindungsgemäß wird nämlich das Band auf eine Temperatur eingestellt, die maximal 50 °K höher liegt, als die Eintauchtemperatur in das Zinkbad.According to the invention, the strip is 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:Further details, features and advantages of the invention result from the following explanation of an exemplary embodiment shown schematically in the drawings. Show it:
Figur 1 ein Layout einer Feuerverzinkungsanlage nach dem Stand der1 shows a layout of a hot-dip galvanizing plant according to the state of the
Technik,Technology,
Figur 2 ein Layout einer Feuerverzinkungsanlage nach der Erfindung.Figure 2 shows 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. 1, a strip 50 is introduced into a pickling station 10 with three pickling stages 11 to 13 in a first process step and a scale layer and reaction products are removed from the strip surface. The pickling is usually carried out 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 Verzinkungstemperatur erwärmt, und in einem letzten Verfahrensschritt durch ein Verzinkungsbad hindurchge- führt. Dabei wird die Oberfläche des Bandes 50 mit einer Feuerverzinkungs- schicht überzogen.In the following process step, the strip 50 is introduced into the rinsing station 20 with the rinsing stages 21 to 23 and the strip surface is freed of residues of the pickling and the pickling products. The tape is then introduced into the drying station 30 and dried therein. From there, the strip 50 is introduced in a further process step into an oven 40, comprising a preheating stage 41 and an integrated temperature control stage 42, and is preferably heated therein to the galvanizing temperature in a protective gas atmosphere, and in a last process step through a galvanizing bath. leads. The surface of the strip 50 is coated with a hot-dip galvanizing layer.
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 FIG. 1, according to the layout of the hot-dip galvanizing plant according to FIG. 2, the process steps between the last rinsing stage 23 of the rinsing station 20 via the drying station 30 and the inlet 43 of the tempering furnace 40 are carried out with 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 Trocknungsmedium 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. 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 drying station 30 is hermetically sealed on both sides with locks 70, 80 following the neighboring stations 20 and 40 against the entry of atmospheric oxygen, 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 are connected to one another by locks 70, 80 and are hermetically sealed from the surrounding atmosphere. 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 output 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

Patentansprüche claims
1. Verfahren zum Feuerverzinken von warmgewalztem Stahlband, wobei: in einem ersten Verfahrensschritt das Band (50) in eine Beizstation (10-13) eingeführt und darin eine Zunderschicht sowie Reaktionsprodukte von der Bandoberfläche entfernt werden, in einem weiteren Verfahrensschritt das Band (50) in eine Spülstation (21-23) eingeführt und darin die Bandoberfläche von Rückständen der Beize und Beizprodukten befreit, und anschließend in eine Trockenstation eingeführt und getrocknet wird, und von dort in einem weiteren Verfahrensschritt in einen Ofen (40) eingeführt und darin unter Schutzgasatmosphäre auf Verzinkungstemperatur eingestellt, und in einem letzten Verfahrensschritt durch ein Verzinkungsbad hindurchgeführt und dabei die Oberfläche des Bandes (50) mit einer Feuerverzinkungsschicht überzogen wird, dadurch gekennzeichnet, daß die Bandtemperatur im Ofen (40) maximal auf 50 °K über Eintauchtemperatur in's Zinkbad eingestellt wird.1. A method for hot-dip galvanizing hot-rolled steel strip, wherein: in a first step the strip (50) is introduced into a pickling station (10-13) and a scale layer and reaction products are removed from the strip surface, in a further step the strip (50) is introduced into a rinsing station (21-23) and the strip surface is freed of residues of the pickling and pickling products, and is then introduced into a drying station and dried, and from there is introduced in a further process step into an oven (40) and in a protective gas atmosphere The galvanizing temperature is set, and in a last process step is passed through a galvanizing bath and the surface of the strip (50) is coated with a hot-dip galvanizing layer, characterized in that the strip temperature in the furnace (40) is set to a maximum of 50 ° K above the immersion temperature in the zinc bath.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die H2-Konzentration im Ofen (40) auf maximal 20 %, bevorzugt auf weniger als 5 % eingestellt wird.2. The method according to claim 1, characterized in that the H 2 concentration in the furnace (40) is set to a maximum of 20%, preferably to less than 5%.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Verfahrensschritte zwischen der letzten Spülstufe (23) der Spülstation (20) über die Trockenstation (30) bis hin zum Einlaß (43) des Ofens (40) unter hermetischer Abschirmung gegen Luftsauerstoff aus der Umgebung durchgeführt werden. 3. The method according to claim 1 or 2, characterized in that 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 furnace (40) under hermetic shielding against atmospheric oxygen be carried out from the surroundings.
4. Verfahren nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, daß in die letzte Spülstufe (23) der Spülstation (20) ein wasserabweisendes bzw. -bindendes und das Band (50) benetzendes Medium (25) aufgegeben wird.4. The method according to claim 1, 2 or 3, characterized in that in the last rinsing stage (23) of the rinsing station (20) a water-repellent or -binding and the band (50) wetting medium (25) is added.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß das in der dritten Spülstufe (23) aufgegebene Medium (25) NH3 oder eine NH3-haltige Lösung ist.5. The method according to claim 4, characterized in that the medium (25) given in the third rinsing stage (23) is NH 3 or an NH 3 -containing solution.
6. Verfahren nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Trocknung des Bandes (50) in der Trockenstation (30) ohne Luftzufuhr von außen mittels Wärmestrahlung unter Zusatz einer Mischung von Stickstoff, Wasserstoff und Ammoniakgas (N2/NH3) + H2 oder einer Mischung von zweien der genannten Gase vorgenommen wird.6. The method according to one or more of claims 1 to 5, characterized in that the drying of the belt (50) in the drying station (30) without external air supply by means of heat radiation with the addition of a mixture of nitrogen, hydrogen and ammonia gas (N 2 / NH 3 ) + H 2 or a mixture of two of the gases mentioned.
7. Warmbandverzinkungsanlage, umfassend eine Beizstation (10), eine Spülstation (20), einen Trockner (30), einen Ofen (40) sowie ein nachgeordnetes Feuerverzinkungsbad (60), dadurch gekennzeichnet, daß der Auslaß der letzten Spülstufe (23) der Spülstation (20) mit dem Einlaß des Trockners (30), und dessen Auslaß mit dem Einlaß (43) des Ofens (40) durch Schleusen (70, 80) miteinander verbunden und gegenüber der umgebenden Atmosphäre hermetisch abgedichtet sind.7. Hot strip galvanizing system, comprising a pickling station (10), a rinsing station (20), a dryer (30), an oven (40) and a downstream hot-dip galvanizing bath (60), characterized in that the outlet of the last rinsing stage (23) of the rinsing station (20) with the inlet of the dryer (30), and the outlet of which is connected to the inlet (43) of the oven (40) by means of locks (70, 80) and are hermetically sealed from the surrounding atmosphere.
8. Anlage nach Anspruch 7, dadurch gekennzeichnet, daß daß die Spülstufen (21-23) und die Erwärmungsstufe (41) bzw. die Temperierstufe (42) gegeneinander durch Zwischenwände (24) abgeschottet sind. 8. Installation according to claim 7, characterized in that the rinsing stages (21-23) and the heating stage (41) and the temperature control stage (42) are partitioned off from one another by partition 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)

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

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KR100704692B1 (en) * 2002-09-13 2007-04-10 제이에프이 스틸 가부시키가이샤 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

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CN1201029C (en) 2005-05-11
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