EP0959145A1 - Method and apparatus for carrying out the heating of a galvannealed process - Google Patents
Method and apparatus for carrying out the heating of a galvannealed process Download PDFInfo
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- EP0959145A1 EP0959145A1 EP99109130A EP99109130A EP0959145A1 EP 0959145 A1 EP0959145 A1 EP 0959145A1 EP 99109130 A EP99109130 A EP 99109130A EP 99109130 A EP99109130 A EP 99109130A EP 0959145 A1 EP0959145 A1 EP 0959145A1
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 31
- 238000000137 annealing Methods 0.000 claims abstract description 26
- 230000001939 inductive effect Effects 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 238000005244 galvannealing Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 18
- 238000005246 galvanizing Methods 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 description 16
- 238000000576 coating method Methods 0.000 description 16
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 11
- 229910052725 zinc Inorganic materials 0.000 description 11
- 239000011701 zinc Substances 0.000 description 11
- 239000000956 alloy Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 238000011282 treatment Methods 0.000 description 7
- 238000005275 alloying Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical class [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
Definitions
- the invention relates to a method and an apparatus for Execution of the annealing of a galvannealing process, at the strips and sheets, especially of steel, after a Hot galvanizing are subjected to an annealing process Heating the coated material with the following Keep at glowing end temperature.
- the coating of the coated tape treated in this way exists only from iron-zinc compounds with approx. 10-12% Fe.
- the annealing of a galvannealing process goes a conventional one Hot-dip galvanizing process ahead.
- the Steel surface cleaned first.
- one recrystallizing annealing of the hard-rolled input material performed in an oven under a protective gas atmosphere.
- the strip is then cooled to the galvanizing temperature and hot-dip galvanized using an aluminum-containing molten zinc.
- the excess zinc melt stripped with air or nitrogen.
- phase structure set for this annealing is for Quality of the coating as well as the usability of the galvannealing-treated Base material crucial, for example during the subsequent deep-drawing process in the press shop.
- This galvannealing furnace is used in conventional systems consisting of two zones: on the one hand, the zone for inductive heating of the tape and on the other hand the adjoining zone to keep at the desired final temperature.
- the holding zone is usually via resistance-heated or gas-fired Heated parts.
- the phase structure of the coating material is special depending on the parameters temperature and time. These important Parameters can be determined by the system parameters, the strip inlet temperature into the zinc smelt, the temperature of the Zinc melt, the aluminum concentration in the zinc melt and the thickness of the coating can be influenced. The most essential The influencing variable is the base material, i.e. the alloy composition of the steel and its condition.
- Galvannealing-treated thin sheet is mainly found in the Automotive industry use and is characterized by good Weldability and paintability.
- IF steels are steels that are not interstitial in the iron grid have dissolved atoms.
- the C and N atoms are through selectively added carbonitride formers (Ti, Nb, V).
- IF steels show no significant levels strength-increasing elements such as P, Mn or B.
- the Element Si can improve the adhesion of the Galvanealed coating can be added (up to approx. 0.10%).
- the two steel groups, IF steels and higher strength steels have, however, in relation to the applied zinc coating a clearly different alloy behavior, especially with regard to their speed.
- the alloy formation in the high-strength steels runs significantly slower than with the IF steels.
- the present invention is therefore based on the object a method and an apparatus for the annealing of a galvannealing process to propose the sheets and strips different base materials, in particular high-strength steels without being subjected to performance losses can
- the core of the invention is the adaptation of the glow cycle with regard to the parameters of temperature and time for the base materials, here especially high-strength steels, to take into account of the material-specific alloy progress.
- the proposed process engineering in the form of a gradual Annealing treatment is an opportunity for controlled adjustment the properties between base material and coating material as well as the covering material itself.
- This annealing treatment should advantageously be carried out in this way be that the heating process with subsequent hold on Final temperature by a second holding process at one temperature interrupted below the final temperature.
- this be an inductive zone Heating the belt and another zone for Maintaining the tape at the warm-up temperature includes, whereby between the zone for inductive heating of the strip and the End stop zone at least one further stop zone is provided is.
- the proposed procedure of the gradual Annealing treatment in a galvannealing process as well as the proposed one The structure of the annealing furnace shows the following advantages:
- the annealing parameters are the alloy sequence of the combination Steel / coating material adapted. This is not the point overheating in the coating material without any Alloy formation occurs. Furthermore, one becomes possible counteracted increased evaporation of zinc. This is a major advantage for both the operation of the Galvannealed furnace as well as for the morphology of the Galvanealed coating.
- the method according to the invention means and the proposed furnace no loss in performance of the hot-dip galvanizing plant.
- FIG. 1 shows schematically the structure of the invention Galvannealing furnace variant with interrupted heating zone.
- the galvanealing furnace 1 comprises a first zone 2a for inductive heating. This is followed by a holding zone 3a on. After this holding zone 3a, the belt is passed through again led a heating zone 2b. Then in a second holding zone 3b the coated strip to the final temperature held.
- Figure 3 shows an example of such Step-by-step heating curve resulting from furnace build-up (Curve shape c).
- the line speed here is 90m / min.
- the belt runs at an initial temperature of 420 ° C in the oven and will quickly open in a first stage Heated at 470 ° C.
- the belt then runs into the first holding zone (3a) and is kept at the intermediate temperature for about 7s. Then another heating process takes place on the Final glowing temperature of 520 ° C instead.
- FIGS. 2a and b Galvannealing ovens The structure of conventional ones is shown schematically in FIGS. 2a and b Galvannealing ovens shown. Both variants exist from a first zone for inductive heating 2 as well a second, adjoining zone 3, for holding the Band to final temperature.
- Known systems with inductive Band heating have either in the inductive heating section 2 several induction coils 2a, b, c, d, usually 4-7 coils, on ( Figure 2a) or include only a single induction coil 2 ( Figure 2b).
- This single coil 2 has the same installed capacity as the previous several Coils together. The difference is in the essential smaller band area in the inductor, which makes the specific Performance or power density is significantly increased, what manifests itself in a higher heating rate.
- FIG. 3 The temperature-time profiles of the annealing treatments after Oven variants of FIGS. 2a and b are also shown in FIG. 3 shown.
- the oven according to the invention quickly reached the final glowing temperature. This is convenient for IF steels, the alloying point of which is already shorter Time is reached.
- the alloying point is also due to higher alloy contents in the steel only after prolonged glow reached.
- To overheat the coating to avoid and a controlled alloy process between base material and coating material as well as in Setting the coating material yourself will be a Intermediate annealing introduced with subsequent heating up Final glowing temperature.
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- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Tunnel Furnaces (AREA)
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Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Durchführung der Glühung eines Galvannealing-Prozesses, bei dem Bänder und Bleche, insbesondere aus Stahl, nach einem Feuerverzinken einer Glühung unterzogen werden durch Aufheizen des beschichteten Materials mit nachfolgendem Halten auf Glühendtemperatur.The invention relates to a method and an apparatus for Execution of the annealing of a galvannealing process, at the strips and sheets, especially of steel, after a Hot galvanizing are subjected to an annealing process Heating the coated material with the following Keep at glowing end temperature.
Wird feuerverzinktes Blech oder Band nach dem Schmelztauchen geglüht (bei Temperaturen oberhalb des Schmelzpunktes von Zink), so nennt man das Produkt Galvannealed-Blech bzw. Band, den Prozeß Galvannealing ("galvanizing" = Galvanisieren, Feuerverzinken von Metallen sowie "annealing" = Glühen).Becomes hot-dip galvanized sheet or strip after hot dipping annealed (at temperatures above the melting point of Zinc), that's what the product is called galvannealed sheet or strip, the process of galvanizing ("galvanizing" = galvanizing, Hot-dip galvanizing of metals and "annealing" = annealing).
Der so behandelte Überzug des beschichteten Bandes besteht nur aus Eisen-Zink-Verbindungen mit ca. 10-12% Fe.The coating of the coated tape treated in this way exists only from iron-zinc compounds with approx. 10-12% Fe.
Der Glühung eines Galvannealing-Prozesses geht ein herkömmlicher Feuerverzinkungsprozeß voraus. Hierbei wird die Stahloberfläche zuerst gereinigt. Dann wird eine rekristallisierende Glühung des walzharten Eingangsmaterials in einem Ofen unter Schutzgasatmosphäre durchgeführt. Das Band wird anschließend auf Verzinkungstemperatur abgekühlt und mittels einer aluminiumhaltigen Zinkschmelze feuerverzinkt. Abschließend wird die überschüssigen Zinkschmelze mittels Luft oder Stickstoff abgestriffen. The annealing of a galvannealing process goes a conventional one Hot-dip galvanizing process ahead. Here, the Steel surface cleaned first. Then one recrystallizing annealing of the hard-rolled input material performed in an oven under a protective gas atmosphere. The The strip is then cooled to the galvanizing temperature and hot-dip galvanized using an aluminum-containing molten zinc. Finally, the excess zinc melt stripped with air or nitrogen.
Bei einem so oberflächenbeschichteten Stahlband wird der Galvannealing-Prozeß durch eine sich anschließende Glühung in einem zusätzlichen Ofen vervollständigt.With such a steel strip coated with surface, the galvannealing process by a subsequent annealing in completed an additional oven.
Hierbei läuft zwischen der Stahlmatrix und dem Zinküberzug ein diffusionsgesteuerter Prozeß ab. In Abhängigkeit von der bei der Glühung eingestellten Temperatur und der Glühzeit bilden sich unterschiedliche FeZn-Phasen gemäß Zink-Eisen-Zustandsdiagramm aus. Die jeweiligen Phasenanteile bestimmen den Gesamteisengehalt des Überzuges.Here runs between the steel matrix and the zinc coating a diffusion-controlled process. Depending on the the temperature and the glow time set for the glow Different FeZn phases are formed according to the zinc-iron state diagram out. Determine the respective phase proportions the total iron content of the coating.
Der bei dieser Glühung eingestellte Phasenaufbau ist für die Qualität des Überzuges sowie für die Verwendbarkeit des galvannealing-behandelten Grundwerkstoffes entscheidend, beispielsweise beim späteren Tiefziehvorgang im Preßwerk.The phase structure set for this annealing is for Quality of the coating as well as the usability of the galvannealing-treated Base material crucial, for example during the subsequent deep-drawing process in the press shop.
In konventionellen Anlagen besteht dieser Galvannealing-Ofen aus zwei Zonen: zum einen die Zone zum induktiven Aufheizen des Bandes und zum anderen die sich daran anschließende Zone zum Halten auf der gewünschten Endtemperatur. Die Haltezone wird üblicherweise über widerstandsbeheizte oder gasbefeuerte Ofenteile beheizt.This galvannealing furnace is used in conventional systems consisting of two zones: on the one hand, the zone for inductive heating of the tape and on the other hand the adjoining zone to keep at the desired final temperature. The holding zone is usually via resistance-heated or gas-fired Heated parts.
Die Galvannealing-Glühung und somit die Erzielung eines definierten Phasenaufbaus des Überzugmaterials ist insbesondere von den Parametern Temperatur und Zeit abhängig. Diese wichtigen Parameter können durch die Anlagenparameter, die Bandeinlauftemperatur in die Zinkschmelze, die Temperatur der Zinkschmelze, die Aluminium-Konzentration in der Zinkschmelze sowie der Dicke der Beschichtung beeinflußt werden. Die wesentlichste Einflußgröße ist der Grundwerkstoff, d.h. die Legierungszusammensetzung des Stahls und dessen Zustand.Galvannealing annealing and thus achieving a defined one The phase structure of the coating material is special depending on the parameters temperature and time. These important Parameters can be determined by the system parameters, the strip inlet temperature into the zinc smelt, the temperature of the Zinc melt, the aluminum concentration in the zinc melt and the thickness of the coating can be influenced. The most essential The influencing variable is the base material, i.e. the alloy composition of the steel and its condition.
Galvannealing-behandeltes Feinblech findet überwiegend in der Automobilindustrie Verwendung und zeichnet sich durch gute Schweißbarkeit und Lackierbarkeit aus. Galvannealing-treated thin sheet is mainly found in the Automotive industry use and is characterized by good Weldability and paintability.
Bisher wurden für dieses Einsatzgebiet fast ausschließlich IF-Stähle als Grundwerkstoff für Tiefzieh-, Sondertiefzieh- und Extratiefziehgüten für eine Galvannealing-Behandlung verwendet.So far, have been used almost exclusively for this area of application IF steels as base material for deep-drawing, special deep-drawing and Extra deep drawing grades for a galvannealing treatment used.
Bei IF-Stählen (= Abkürzung für Interstitial Free) handelt es sich um Stähle, die im Eisengitter keine interstitiell gelösten Atome aufweisen. Die C- und die N-Atome werden durch gezielt zulegierte Carbonitridbildner (Ti, Nb, V) abgebunden. IF-Stähle weisen keine nennenswerten Gehalte an festigkeitssteigernden Elementen wie P, Mn oder B auf. Das Element Si kann hingegen zur Verbesserung der Haftung des Galvanealed-Überzuges zulegiert werden (bis ca. 0,10%).IF steels (= abbreviation for interstitial free) are are steels that are not interstitial in the iron grid have dissolved atoms. The C and N atoms are through selectively added carbonitride formers (Ti, Nb, V). IF steels show no significant levels strength-increasing elements such as P, Mn or B. The Element Si, however, can improve the adhesion of the Galvanealed coating can be added (up to approx. 0.10%).
Um der Forderung nach einer Gewichtsreduzierung von PKWs nachzukommen, werden zunehmend dünnere Bleche eingesetzt, die aber die gleichen Festigkeitseigenschaften wie herkömmliche Bleche aufweisen müssen. Diese Anforderung kann nur mittels Verwendung höherfester Stähle, auch höherfester IF-Stähle, erfüllt werden. Höherfeste IF-Stähle weisen nennenswerte Gehalte obengenannter Elemente auf. Werden nachfolgend höherfeste Stähle erwähnt, sind damit auch höherfeste IF-Stähle, BH-Stähle und TRIP-Stähle gemeint.To meet the demand for weight reduction in cars increasingly thin sheets are used, which but the same strength properties as conventional ones Must have sheets. This requirement can only be met using Use of high strength steels, also high strength IF steels, be fulfilled. Higher strength IF steels have noteworthy Stop the above items. Be subsequent higher-strength steels mentioned, are therefore also higher-strength IF steels, BH steels and TRIP steels are meant.
Die beiden Stahlgruppen, IF-Stähle und höherfeste Stähle, weisen allerdings im Verhältnis zum aufgebrachten Zinküberzug ein deutlich unterschiedliches Legierungsverhalten auf, insbesondere hinsichtlich ihrer Geschwindigkeit. Hierbei läuft die Legierungsbildung bei den höherfesten Stählen wesentlich langsamer ab als bei den IF-Stählen.The two steel groups, IF steels and higher strength steels, have, however, in relation to the applied zinc coating a clearly different alloy behavior, especially with regard to their speed. Here the alloy formation in the high-strength steels runs significantly slower than with the IF steels.
Damit liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung für die Glühung eines Galvannealing-Prozesses vorzuschlagen, der Bleche und Bänder aus unterschiedlichen Grundwerkstoffen, insbesondere aus höherfesten Stählen, ohne Leistungseinbußen unterworfen werden könnenThe present invention is therefore based on the object a method and an apparatus for the annealing of a galvannealing process to propose the sheets and strips different base materials, in particular high-strength steels without being subjected to performance losses can
Diese Aufgabe wird mittels der Merkmale des Verfahrensanspruchs 1 sowie der Vorrichtungsmerkmale des Anspruchs 3 gelöst. Vorteilhafte Ausführungen sind in den Unteransprüchen offenbart.This task is accomplished by means of the features of the process claim 1 and the device features of claim 3 solved. Advantageous designs are in the subclaims disclosed.
Kern der Erfindung ist die Anpassung des Glühzyklusses hinsichtlich der Parameter Temperatur und Zeit an die Grundwerkstoffe, hier insbesondere höherfeste Stähle, zur Berücksichtigung des werkstoffspezifischen Legierungsfortschrittes. Die vorgeschlagene Verfahrenstechnik in Form einer stufenweise Glühbehandlung gibt eine Möglichkeit zum kontrollierten Einstellen der Eigenschaften zwischen Grundwerkstoff und Überzugmaterial sowie des Überzugmaterials selbst.The core of the invention is the adaptation of the glow cycle with regard to the parameters of temperature and time for the base materials, here especially high-strength steels, to take into account of the material-specific alloy progress. The proposed process engineering in the form of a gradual Annealing treatment is an opportunity for controlled adjustment the properties between base material and coating material as well as the covering material itself.
Vorteilhafterweise soll diese Glühbehandlung so durchgeführt werden, daß der Aufheizvorgang mit anschließendem Halten auf Endtemperatur durch einen zweiten Haltevorgang auf einer Temperatur unterhalb der Endtemperatur unterbrochen wird.This annealing treatment should advantageously be carried out in this way be that the heating process with subsequent hold on Final temperature by a second holding process at one temperature interrupted below the final temperature.
Hinsichtlich der Vorrichtungsmerkmale zum Aufbau eines geeigneten Ofens wird vorgeschlagen, daß dieser eine Zone zum induktiven Aufheizen des Bandes sowie eine weitere Zone zum Halten des Bandes auf der Aufwärmtemperatur umfaßt, wobei zwischen der Zone zum induktiven Aufheizen des Bandes und der Endhaltezone mindestens eine weitere Haltezone vorgesehen ist.Regarding the device features to build a suitable one It is proposed that this be an inductive zone Heating the belt and another zone for Maintaining the tape at the warm-up temperature includes, whereby between the zone for inductive heating of the strip and the End stop zone at least one further stop zone is provided is.
Bei einer vorteilhaften Ausführungsform, die insbesondere für höherfeste Stahlbänder geeignet ist, besteht dieser Ofen aus vier Zonen, nämlich einer erste Induktionszone mit einer nachfolgenden ersten Haltezone sowie einer zweiten sich daran anschließenden Induktionszone mit nachfolgender zweiter Haltezone. In an advantageous embodiment, which is particularly for this oven is made of high-strength steel strips four zones, namely a first induction zone with one subsequent first stop zone and a second itself subsequent induction zone with subsequent second holding zone.
Das vorgeschlagene Verfahren der stufenweise durchgeführten Glühbehandlung in einem Galvannealing-Prozeß sowie der vorgeschlagene Aufbau des Glühofens zeigen die folgenden Vorteile:The proposed procedure of the gradual Annealing treatment in a galvannealing process as well as the proposed one The structure of the annealing furnace shows the following advantages:
Durch die stufenweise durchgeführte Erhöhung der Temperatur wird eine Anpassung der Glühbehandlung an die langsameren Diffusionsprozesse und somit Legierungsgeschwindigkeit in höherfesten Stählen erreicht. Der Legierungsvorgang ist kontrollier- und regelbar. Dadurch ist eine gleichmäßige Produktqualität unter kontrollierbaren Produktionsbedingungen möglich. Dieses stufenweise Erwärmen zeigt keine Nachteile bei den IF-Stählen.By gradually increasing the temperature will adjust the annealing treatment to the slower ones Diffusion processes and thus alloying speed in higher strength Steels reached. The alloying process can be checked and regulated. This makes it even Product quality under controllable production conditions possible. This gradual heating shows no disadvantages for the IF steels.
Die Glühparameter, insbesondere die Aufheiztemperatur und - geschwindigkeit, sind dem Legierungsablauf der Kombination Stahl/Überzugmaterials angepaßt. Damit kommt es nicht zu einer Überhitzung im Überzugmaterial, ohne daß eine Legierungsbildung eintritt. Weiterhin wird einer möglichen verstärkten Verdampfung von Zink entgegengewirkt. Dieses ist ein wesentlicher Vorteil sowohl für den Betrieb des Galvannealed-Ofens als auch für die Morphologie des Galvanealed-Überzuges.The annealing parameters, especially the heating temperature and - speed, are the alloy sequence of the combination Steel / coating material adapted. This is not the point overheating in the coating material without any Alloy formation occurs. Furthermore, one becomes possible counteracted increased evaporation of zinc. This is a major advantage for both the operation of the Galvannealed furnace as well as for the morphology of the Galvanealed coating.
Zur Vermeidung einer Überhitzung des Zinküberzugs in herkömmlichen Öfen zur Galvannealing-Behandlung, die nur eine einzige Aufheizzone aus mehreren oder nur einer einzigen Induktionsspule aufweisen, sowie zur Einstellung eines kontrollierten Legierungsvorgangs müßte die Leistung der Induktions-Zone abgesenkt werden. Um aber noch die gewünschte Galvannealing-Temperatur zu erreichen, ist es notwendig, die Anlagengeschwindigkeit zu vermindern. Dies ist aber mit einer Leistungseinbuße der Feuerverzinkungsanlage verbunden. To avoid overheating the zinc coating in conventional Galvannealing treatment ovens, only one Heating zone consisting of several or only one induction coil have, as well as for setting a controlled Alloying process would have the performance of the induction zone be lowered. But at the desired galvannealing temperature to achieve it is necessary to speed up the plant to diminish. But this is with a loss of performance connected to the hot-dip galvanizing plant.
Im Gegensatz hierzu bedeutet das erfindungsgemäße Verfahren sowie der vorgeschlagene Ofen keine Leistungseinbuße der Feuerverzinkungsanlage.In contrast to this, the method according to the invention means and the proposed furnace no loss in performance of the hot-dip galvanizing plant.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus den Ansprüchen und der nachfolgenden Beschreibung. Hierbei zeigen:
- Figur 1
- schematisch den Aufbau einer Ausführungsform des erfindungsgemäßen Ofenaufbaus zur Durchführung einer Glühung während eines Galvannealing-Prozesses;
Figuren 2a und b- schematisch den Aufbau von herkömmlichen Öfen zur Durchführung einer Glühung während eines Galvannealing-Prozesses;
- Figur 3
- den Bandtemperaturverlauf über der Zeit bei den verschiedenen
Galvannealing-Ofenvarianten nach Figur
1 und
Figuren 2a und b.
- Figure 1
- schematically the structure of an embodiment of the furnace structure according to the invention for performing an annealing during a galvannealing process;
- Figures 2a and b
- schematically the structure of conventional furnaces for performing annealing during a galvannealing process;
- Figure 3
- the strip temperature curve over time in the various galvannealing furnace variants according to FIG. 1 and FIGS. 2a and b.
Figur 1 zeigt schematisch den Aufbau der erfindungsgemäßen
Galvannealing-Ofenvariante mit unterbrochener Aufheizzone.
Der Galvanealing-Ofen 1 umfaßt eine erste Zone 2a zum
induktiven Aufheizen. Daran schließt sich eine Haltezone 3a
an. Nach dieser Haltezone 3a wird das Band wiederum durch
eine Aufheizzone 2b geführt. Anschließend wird in einer
zweiten Haltezone 3b das beschichtete Band auf Endtemperatur
gehalten.Figure 1 shows schematically the structure of the invention
Galvannealing furnace variant with interrupted heating zone.
The galvanealing furnace 1 comprises a
Figur 3 zeigt an einem Beispiel die sich bei einem solchen Ofenaufbau ergebende stufenweise verlaufende Aufheizkurve (Kurvenverlauf c). Die Anlagengeschwindigkeit beträgt hierbei 90m/min. Das Band läuft mit einer Anfangstemperatur von 420°C in den Ofen ein und wird schnell in einer ersten Stufe auf 470°C erhitzt. Danach läuft das Band in die erste Haltezone (3a) und wird etwa 7s auf der Zwischentemperatur gehalten. Anschließend findet ein weiterer Aufheizvorgang auf die Glühendtemperatur von 520°C statt.Figure 3 shows an example of such Step-by-step heating curve resulting from furnace build-up (Curve shape c). The line speed here is 90m / min. The belt runs at an initial temperature of 420 ° C in the oven and will quickly open in a first stage Heated at 470 ° C. The belt then runs into the first holding zone (3a) and is kept at the intermediate temperature for about 7s. Then another heating process takes place on the Final glowing temperature of 520 ° C instead.
In den Figuren 2a und b ist schematisch der Aufbau von herkömmlichen
Galvannealing-Öfen gezeigt. Beide Varianten bestehen
aus einer ersten Zone zum induktiven Aufheizen 2 sowie
einer zweiten, sich anschließenden Zone 3, zum Halten des
Bandes auf Endtemperatur. Bekannte Anlagen mit induktiver
Banderwärmung weisen im induktiven Heizabschnitt 2 entweder
mehrere Induktionsspulen 2a,b,c,d, in der Regel 4-7 Spulen,
auf (Figur 2a) oder umfassen nur noch eine einzige Induktionsspule
2 (Figur 2b). Diese einzige Spule 2 besitzt die
gleiche installierte Leistung wie die bisherigen mehreren
Spulen zusammen. Der Unterschied besteht in der wesentlich
geringeren Bandfläche im Induktor, wodurch die spezifische
Leistung bzw. Leistungsdichte signifikant erhöht wird, was
sich in einer höheren Aufheizrate bemerkbar macht.The structure of conventional ones is shown schematically in FIGS. 2a and b
Galvannealing ovens shown. Both variants exist
from a first zone for
Die Temperatur-Zeit-Verläufe der Glühbehandlungen nach den Ofenvarianten der Figuren 2a und b sind ebenfalls in Figur 3 dargestellt. Im Gegensatz zu dem erfindungsgemäßen Ofen wird die Glühendtemperatur schnell erreicht. Dies ist günstig für IF-Stähle, deren Durchlegierungspunkt bereits nach kürzerer Zeit erreicht wird.The temperature-time profiles of the annealing treatments after Oven variants of FIGS. 2a and b are also shown in FIG. 3 shown. In contrast to the oven according to the invention quickly reached the final glowing temperature. This is convenient for IF steels, the alloying point of which is already shorter Time is reached.
Bei höherfesten Stählen wird der Durchlegierungspunkt auch aufgrund höherer Legierungsgehalte im Stahl erst nach längerem Glühen erreicht. Um eine Überhitzung des Überzuges zu vermeiden und einen kontrollierten Legierungsablauf zwischen Grundwerkstoff und Überzugmaterial sowie im Überzugmaterial selbst einzustellen, wird eine Zwischenglühung eingeführt mit anschließendem Aufheizen auf Glühendtemperatur. Ferner wird hiermit einer möglichen Verdampfung von Zink im Galvannealing-Ofen entgegengewirkt.With higher-strength steels, the alloying point is also due to higher alloy contents in the steel only after prolonged glow reached. To overheat the coating to avoid and a controlled alloy process between base material and coating material as well as in Setting the coating material yourself will be a Intermediate annealing introduced with subsequent heating up Final glowing temperature. Furthermore, one is hereby possible Evaporation of zinc counteracted in the galvannealing furnace.
Claims (9)
dadurch gekennzeichnet,
daß während der Glühung der Aufheizschritt von mindestens einem weiteren Halteschritt unterbrochen wird und somit eine stufenweise Erhöhung der Temperatur über der Zeit eingestellt wird.Process for performing the annealing of a galvannealing process, in which strips and sheets, in particular made of steel, are subjected to annealing after hot-dip galvanizing by heating the coated material with subsequent holding to the final annealing temperature,
characterized,
that during the annealing the heating step is interrupted by at least one further holding step and thus a gradual increase in the temperature over time is set.
dadurch gekennzeichnet,
daß der Aufheizvorgang mit anschließendem Halten auf Endtemperatur durch eine Haltestufe auf einer Temperatur unterhalb der Endtemperatur unterbrochen wird.Method according to claim 1,
characterized,
that the heating process with subsequent holding to the final temperature is interrupted by a holding step at a temperature below the final temperature.
umfassend eine Zone zum induktiven Aufheizen des Bandes sowie eine weitere Zone zum Halten des Bandes auf Endtemperatur,
dadurch gekennzeichnet,
daß die Zone zum induktiven Aufheizen des Bandes (2a, 2b) von mindestens einer weiteren Haltezone (3a) unterbrochen ist. Device for performing the annealing of a galvannealing process according to claim 1,
comprising a zone for inductively heating the strip and a further zone for holding the strip to the final temperature,
characterized,
that the zone for inductive heating of the belt (2a, 2b) is interrupted by at least one further holding zone (3a).
dadurch gekennzeichnet,
daß eine erste Induktionszone (2a) mit nachfolgender erster Haltezone (3a) sowie eine zweite sich daran anschließende Induktionszone (2b) mit nachfolgender zweiter Haltezone (3b) vorgesehen sind.Device according to claim 3,
characterized,
that a first induction zone (2a) with a subsequent first holding zone (3a) and a second induction zone (2b) adjoining it with a subsequent second holding zone (3b) are provided.
dadurch gekennzeichnet,
daß die Zonen zum induktiven Aufheizen (2a, 2b) aus mehreren Induktionsspulen besteht.Device according to claim 4,
characterized,
that the zones for inductive heating (2a, 2b) consist of several induction coils.
dadurch gekennzeichnet,
daß die Zonen zum induktiven Aufheizen (2a, 2b) aus einer Induktionsspule besteht.Device according to claim 4,
characterized,
that the zones for inductive heating (2a, 2b) consist of an induction coil.
dadurch gekennzeichnet,
daß die Haltezonen widerstands- oder gasbeheizt sind.Device according to claims 3 to 6,
characterized,
that the holding zones are resistance or gas heated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19822156A DE19822156A1 (en) | 1998-05-16 | 1998-05-16 | Method and device for performing the annealing of a galvannealing process |
| DE19822156 | 1998-05-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0959145A1 true EP0959145A1 (en) | 1999-11-24 |
| EP0959145B1 EP0959145B1 (en) | 2003-01-15 |
Family
ID=7868091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99109130A Expired - Lifetime EP0959145B1 (en) | 1998-05-16 | 1999-05-08 | Method and apparatus for carrying out the heating of a galvannealed process |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6379481B2 (en) |
| EP (1) | EP0959145B1 (en) |
| JP (1) | JP2000026948A (en) |
| AT (1) | ATE231191T1 (en) |
| CA (1) | CA2271816A1 (en) |
| DE (2) | DE19822156A1 (en) |
| ES (1) | ES2192356T3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10023312C1 (en) * | 2000-05-15 | 2001-08-23 | Thyssenkrupp Stahl Ag | Galvannealed sheet and method of making such sheet |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3058840A (en) * | 1959-04-16 | 1962-10-16 | Electric Furnace Co | Induction strip heating apparatus |
| US3307968A (en) * | 1963-09-03 | 1967-03-07 | Armco Steel Corp | Method and apparatus for controlling the alloying of zinc coatings |
| FR1501271A (en) * | 1965-11-15 | 1967-11-10 | Westinghouse Electric Corp | Heat treatment apparatus |
| US4079157A (en) * | 1975-11-19 | 1978-03-14 | Toyo Kogyo Co., Ltd. | Method of fabrication of distortion-resistant material |
| JPS5834168A (en) * | 1981-08-25 | 1983-02-28 | Nippon Kokan Kk <Nkk> | Treatment for fe-zn alloying of zinc hot dipped steel plate |
| JPS5834167A (en) * | 1981-08-25 | 1983-02-28 | Nippon Kokan Kk <Nkk> | Treatment for fe-zn alloying of zinc hot dipped steel plate |
| EP0126696A1 (en) * | 1983-05-24 | 1984-11-28 | UNION SIDERURGIQUE DU NORD ET DE L'EST DE LA FRANCE par abréviation "USINOR" | Method for continuously producing an overaged steel strip coated with zinc or an aluminium-zinc alloy |
| JPH0734213A (en) * | 1993-07-19 | 1995-02-03 | Sumitomo Metal Ind Ltd | Galvannealed steel sheet excellent in interfacial adhesion and its production |
| JPH08165550A (en) * | 1994-12-13 | 1996-06-25 | Nippon Steel Corp | Production of galvannealed steel sheet excellent in flaking resistance |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4287008A (en) * | 1979-11-08 | 1981-09-01 | Bethlehem Steel Corporation | Method of improving the ductility of the coating of an aluminum-zinc alloy coated ferrous product |
| JP2658580B2 (en) * | 1990-12-29 | 1997-09-30 | 日本鋼管株式会社 | Method for producing alloyed hot-dip galvanized steel sheet excellent in press formability and powdering resistance |
| BE1007793A6 (en) * | 1993-12-24 | 1995-10-24 | Centre Rech Metallurgique | Method and installation for continuous strip steel galvanized. |
| KR100284526B1 (en) * | 1996-02-22 | 2001-03-15 | 고지마 마타오 | Alloyed hot-dip galvanized steel sheet and its manufacturing method |
-
1998
- 1998-05-16 DE DE19822156A patent/DE19822156A1/en not_active Withdrawn
-
1999
- 1999-05-08 ES ES99109130T patent/ES2192356T3/en not_active Expired - Lifetime
- 1999-05-08 EP EP99109130A patent/EP0959145B1/en not_active Expired - Lifetime
- 1999-05-08 AT AT99109130T patent/ATE231191T1/en not_active IP Right Cessation
- 1999-05-08 DE DE59904014T patent/DE59904014D1/en not_active Expired - Fee Related
- 1999-05-11 CA CA002271816A patent/CA2271816A1/en not_active Abandoned
- 1999-05-12 US US09/310,831 patent/US6379481B2/en not_active Expired - Fee Related
- 1999-05-13 JP JP11132828A patent/JP2000026948A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3058840A (en) * | 1959-04-16 | 1962-10-16 | Electric Furnace Co | Induction strip heating apparatus |
| US3307968A (en) * | 1963-09-03 | 1967-03-07 | Armco Steel Corp | Method and apparatus for controlling the alloying of zinc coatings |
| FR1501271A (en) * | 1965-11-15 | 1967-11-10 | Westinghouse Electric Corp | Heat treatment apparatus |
| US4079157A (en) * | 1975-11-19 | 1978-03-14 | Toyo Kogyo Co., Ltd. | Method of fabrication of distortion-resistant material |
| JPS5834168A (en) * | 1981-08-25 | 1983-02-28 | Nippon Kokan Kk <Nkk> | Treatment for fe-zn alloying of zinc hot dipped steel plate |
| JPS5834167A (en) * | 1981-08-25 | 1983-02-28 | Nippon Kokan Kk <Nkk> | Treatment for fe-zn alloying of zinc hot dipped steel plate |
| EP0126696A1 (en) * | 1983-05-24 | 1984-11-28 | UNION SIDERURGIQUE DU NORD ET DE L'EST DE LA FRANCE par abréviation "USINOR" | Method for continuously producing an overaged steel strip coated with zinc or an aluminium-zinc alloy |
| JPH0734213A (en) * | 1993-07-19 | 1995-02-03 | Sumitomo Metal Ind Ltd | Galvannealed steel sheet excellent in interfacial adhesion and its production |
| JPH08165550A (en) * | 1994-12-13 | 1996-06-25 | Nippon Steel Corp | Production of galvannealed steel sheet excellent in flaking resistance |
Non-Patent Citations (3)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 007, no. 114 (C - 166) 18 May 1983 (1983-05-18) * |
| PATENT ABSTRACTS OF JAPAN vol. 095, no. 005 30 June 1995 (1995-06-30) * |
| PATENT ABSTRACTS OF JAPAN vol. 096, no. 010 31 October 1996 (1996-10-31) * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE231191T1 (en) | 2003-02-15 |
| JP2000026948A (en) | 2000-01-25 |
| US6379481B2 (en) | 2002-04-30 |
| CA2271816A1 (en) | 1999-11-16 |
| DE59904014D1 (en) | 2003-02-20 |
| DE19822156A1 (en) | 1999-11-18 |
| ES2192356T3 (en) | 2003-10-01 |
| EP0959145B1 (en) | 2003-01-15 |
| US20010035240A1 (en) | 2001-11-01 |
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