EP2356263B1 - Method for producing an improved electrical steel strip - Google Patents

Method for producing an improved electrical steel strip Download PDF

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Publication number
EP2356263B1
EP2356263B1 EP09756690.5A EP09756690A EP2356263B1 EP 2356263 B1 EP2356263 B1 EP 2356263B1 EP 09756690 A EP09756690 A EP 09756690A EP 2356263 B1 EP2356263 B1 EP 2356263B1
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EP
European Patent Office
Prior art keywords
steel strip
recited
electrical steel
oxide layer
less
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.)
Not-in-force
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EP09756690.5A
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German (de)
French (fr)
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EP2356263A1 (en
Inventor
Jochen Bogner
Franz Citroni
Gerald Kasberger
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Voestalpine Stahl GmbH
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Voestalpine Stahl GmbH
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Priority to SI200930672T priority Critical patent/SI2356263T1/en
Priority to PL09756690T priority patent/PL2356263T3/en
Publication of EP2356263A1 publication Critical patent/EP2356263A1/en
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Publication of EP2356263B1 publication Critical patent/EP2356263B1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor

Definitions

  • the invention relates to a method for producing an improved electrical steel as well as the electrical steel produced by the process and its use.
  • the stators of electric motors are made of so-called electrical steel.
  • the electrical steel strip is a strip steel sheet, for example with thicknesses between 0.3 mm and 1.2 mm.
  • This band steel sheet is stamped into the required shapes and from the individual stamped components, the corresponding stator lamination packages are assembled, which are then wound with the corresponding coils. If such an iron core is inserted into a coil, its ferromagnetic properties, which are preset by the steel manufacturer, or at least prepared so that they are adjusted by a final annealing at the user, the permeability and thus the magnetic flux density in the coil elevated. As a result, the number of turns can be reduced in order to achieve a required inductance.
  • the iron of the core is an electrical conductor, it flows in a coil with an iron core through which AC flows in this a current in a quasi-shorted turn, called the eddy current.
  • This eddy current is reduced when the core is not made of a piece of iron but from a stack of iron sheets already described. However, to really reduce this eddy current, the iron sheets or iron fins must be isolated from each other.
  • JP 69-013530 and WO-01/12435 mention blueing process of an electrical steel.
  • Such layers which are achieved by blueing, are mixed layers of Fe 2 O 3 and Fe 3 O 4 in approximately equal proportions.
  • These bleaching treatments are carried out by the user in electric strip ovens by increasing the dew point or in specially designed Bläuungsöfen also by dew point increase.
  • Such a prior art blasting apparatus as is used by many users of electric sheets, is known in FIG. 2 shown.
  • the band 103 is unwound from a bundle 102 of wound steel strip 103 at a unwinding station 104.
  • the steel strip 103 enters a punch 105, wherein in the punch from the steel strip, the sheets, for example, for a coil core, are punched out of the band 103.
  • the punched sheets are stacked to stamped parts stacks 106, wherein the stack then enter into an annealing furnace 107. After a defined cycle time at 650 ° C to 750 ° C enter the stamped parts stack 106 in a blast furnace 108.
  • an atmosphere is set in the interior 109, in which the dew point is> 10 ° C and in particular at> 20 ° C, wherein the atmosphere at about 500 ° C temperature is oxidizing.
  • the punching partial stacks are used as a finished product stack 110 out of the Bläuungsofen, wherein the finished products have a mixed layer film of Fe 2 O 3 and Fe 3 O 4 are each approximately half, wherein the film coating thickness is usually 200 nm.
  • the electrical steel is already formed at the steel manufacturer in a continuous process and in particular during the recrystallization annealing in a continuous annealing (continuous annealing) with an insulating layer.
  • the electrical steel actually assumes a blue color, but the insulating layer is much better isolated than a bleached layer.
  • the electrical tapes produced according to the invention have an insulating layer of only 100 nm, this layer being formed substantially entirely of Fe 3 O 4 .
  • the layer contains only very little Fe 2 O 3 , wherein the Fe 3 O 4 obviously is responsible for the insulating performance, because a 100 nm thick according to the invention blued layer better isolated than a conventional blued layer 200 nm thick.
  • the blued electrical steel produced according to the invention can make the usual painting superfluous, which represents a significant cost advantage over painted sheets.
  • the process according to the invention provides for pressurized air to be applied to the electrical steel strip as it enters the final cooling zone in which it has a temperature between 450 ° C. and 500 ° C.
  • an oxygen concentration between 0.05% and 0.2% oxygen measured in the furnace chamber of the final cooling zone is set.
  • the absolute uniformity of the oxide layer achieved is ensured on the one hand by the introduction of the compressed air into the blower housing of the final cooling fan and on the other hand by the belt temperature and the oxygen concentration.
  • the injection of the compressed air and the adjustment of the oxygen content are carried out so that the dew point is set below -40 ° C and a reducing atmosphere.
  • a layer having a significantly lower thickness Fe 3 O 4 content of 90% and more and at the reduced thickness has such a higher insulation capacity, that it can be used without difficulty as a replacement for painted electrical steel sheets.
  • a continuous annealing plant 1 in particular a continuous annealing plant 1 is used.
  • the steel strip 3 is first unwound at a Abhaspelstation 4 and then passed through a belt cleaning system 5 of a covenant 2 from rolled steel strip 3.
  • the steel strip 3 From the belt cleaning equipment 5, the steel strip 3 enters an inlet storage 6.
  • the known inlet storage 6 has the task to equalize the running of the steel strip 3 by the following aggregates, because to ensure a continuous process is at the Abhaspelstation 4 after uncoiling
  • the first steel bundle was unwound from a steel bundle and the front end of the new steel collar was welded to the rear end of the old steel collar in order to pass the new steel strip 3 through the continuous system.
  • the steel strip 3 From the inlet storage 6, the steel strip 3 enters the actual annealing furnace or the actual annealing device 7.
  • the steel strip first passes into a heating and cooling zone 8 and passes from the heating and cooling zone 8 into a so-called over-age zone 9.
  • From the overaging zone 9 passes the steel strip 3 in a final jet cooling zone 10, wherein the strip is introduced at about 450 ° C to 500 ° C from the overaging zone 9 in the final jet cooling zone.
  • the steel strip 3 in the final jet cooling zone, is subjected to pressurized air in corresponding regions 11, the atmosphere 12 or in the interior 12 of both the overaging zone and in the final jet cooling zone having a dew point below -20 ° C., in particular below -40 ° ° C and preferably below -50 ° C is set. Subsequently, the steel strip 3 runs out of the final jet cooling and arrives in a discharge storage 13, which has the task of picking up steel strip 3, while a first steel strip was unwound and the subsequent second Steel strip is separated from the first steel strip to be subsequently rewound.
  • the steel strip 3 passes through a subsequent tempering 14, to then be rewound at a Aufhaspelstation 15 to a coil 16.
  • the invention it is advantageous that the bluing or the production of an insulating oxide layer on the surface of the steel strip for use as an electrical steel strip in a very high uniformity and with a superior quality such that the insulation performance of the oxide layer due to the composition of over 90 % Fe 3 O 4 results in an outstanding insulation performance even with layer runs of only 100 nm.
  • the electrical strip produced according to the invention with an oxide layer support is able to replace painted electrically-coated strips produced considerably more expensive.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines verbesserten Elektrobandes sowie das mit dem Verfahren hergestellte Elektroband und dessen Verwendung.The invention relates to a method for producing an improved electrical steel as well as the electrical steel produced by the process and its use.

Die Statoren von Elektromotoren werden aus sogenanntem Elektroband hergestellt. Beim Elektroband handelt es sich um ein Bandstahlblech, beispielsweise mit Dicken zwischen 0,3 mm und 1,2 mm.The stators of electric motors are made of so-called electrical steel. The electrical steel strip is a strip steel sheet, for example with thicknesses between 0.3 mm and 1.2 mm.

Dieses Bandstahlblech wird in die benötigten Formen gestanzt und aus den einzelnen gestanzten Bestandteilen werden die entsprechenden Statorblechpakete zusammengefügt, welche anschließend mit den entsprechenden Spulen gewickelt werden. Wird in eine Spule ein derartiger Eisenkern eingesetzt, so wird durch dessen ferromagnetische Eigenschaften, die vom Stahlhersteller voreingestellt werden, oder zumindest soweit vorbereitet werden, dass sie durch ein abschließendes Glühen beim Anwender eingestellt werden, die Permeabilität und damit auch die magnetische Flussdichte in der Spule erhöht. Hierdurch kann die Anzahl der Windungen verringert werden, um eine benötigte Induktivität zu erreichen.This band steel sheet is stamped into the required shapes and from the individual stamped components, the corresponding stator lamination packages are assembled, which are then wound with the corresponding coils. If such an iron core is inserted into a coil, its ferromagnetic properties, which are preset by the steel manufacturer, or at least prepared so that they are adjusted by a final annealing at the user, the permeability and thus the magnetic flux density in the coil elevated. As a result, the number of turns can be reduced in order to achieve a required inductance.

Weil das Eisen des Kerns ein elektrischer Leiter ist, fließt in einer von Wechselstrom durchflossenen Spule mit Eisenkern in diesem ein Strom in einer quasi kurzgeschlossenen Windung, der Wirbelstrom genannt wird. Dieser Wirbelstrom wird geringer, wenn der Kern nicht aus einem Stück Eisen sondern aus einem Stapel der bereits beschriebenen Eisenbleche besteht. Um jedoch diesen Wirbelstrom wirklich zu verringern, müssen die Eisenbleche bzw. Eisenlamellen voneinander isoliert werden.Because the iron of the core is an electrical conductor, it flows in a coil with an iron core through which AC flows in this a current in a quasi-shorted turn, called the eddy current. This eddy current is reduced when the core is not made of a piece of iron but from a stack of iron sheets already described. However, to really reduce this eddy current, the iron sheets or iron fins must be isolated from each other.

Für die Isolierung dieser Lamellen aus Elektroband gegeneinander gibt es drei gängige Möglichkeiten, nämlich die Stahloberfläche mit einem organischen Lack zu beschichten, die Stahloberfläche mit einem anorganischen Lack zu beschichten oder die Stahloberfläche zu oxidieren. Das Oxidieren der Stahloberfläche wird insbesondere bei Elektroband durchgeführt, welches für Statoren von Kleinmotoren, d. h. Motoren z. B. in der Haushaltsgeräteindustrie, verwendet wird.For the isolation of these slats of electrical steel against each other, there are three common ways, namely to coat the steel surface with an organic paint, to coat the steel surface with an inorganic paint or to oxidize the steel surface. The oxidation of the steel surface is carried out in particular in electrical steel, which for stators of small engines, d. H. Engines z. In the household appliance industry.

JP 69-013530 und WO-01/12435 erwähnen Bläuen verfahren eines Elektrobandes. Derartige Schichten, die durch Bläuen erzielt werden, sind Mischschichten aus Fe2O3 und Fe3O4 zu etwa gleichen Anteilen. Diese Bläuungsbehandlungen werden beim Anwender in Elektrobandöfen durch Erhöhung des Taupunktes durchgeführt bzw. in eigens dafür konzipierten Bläuungsöfen ebenfalls durch Taupunkterhöhung. Eine derartige Bläuungsvorrichtung nach dem Stand der Technik, wie sie bei vielen Anwendern von Elektroblechen eingesetzt wird, ist in Figur 2 gezeigt. JP 69-013530 and WO-01/12435 mention blueing process of an electrical steel. Such layers, which are achieved by blueing, are mixed layers of Fe 2 O 3 and Fe 3 O 4 in approximately equal proportions. These bleaching treatments are carried out by the user in electric strip ovens by increasing the dew point or in specially designed Bläuungsöfen also by dew point increase. Such a prior art blasting apparatus, as is used by many users of electric sheets, is known in FIG. 2 shown.

Bei dieser Anlage 101 wird von einem Bund 102 aus aufgewickeltem Stahlband 103 an einer Abhaspelstation 104 das Band 103 abgehaspelt. Das Stahlband 103 läuft in einer Stanze 105 ein, wobei in der Stanze aus dem Stahlband die Bleche, beispielsweise für einen Spulenkern, aus dem Band 103 ausgestanzt werden. Die ausgestanzten Bleche werden zu Stanzteilstapeln 106 aufgestapelt, wobei die Stapel anschließend in einen Glühofen 107 einlaufen. Nach einer definierten Durchlaufzeit bei 650°C bis 750 °C gelangen die Stanzteilstapel 106 in einen Bläuungsofen 108. Im Bläuungsofen 108 wird im Innenraum 109 eine Atmosphäre eingestellt, bei der der Taupunkt bei > 10°C und insbesondere bei > 20 °C liegt, wobei die Atmosphäre bei etwa 500°C Temperatur oxidierend ist. Nach der vorbestimmten hinreichenden Durchlaufzeit gelangen die Stanzteilstapel als fertige Produktstapel 110 aus dem Bläuungsofen heraus, wobei die Fertigprodukte eine Mischschichtauflage aus Fe2O3 und Fe3O4 jeweils etwa zur Hälfte haben, wobei die Schichtauflagedicke üblicherweise 200 nm beträgt.In this system 101, the band 103 is unwound from a bundle 102 of wound steel strip 103 at a unwinding station 104. The steel strip 103 enters a punch 105, wherein in the punch from the steel strip, the sheets, for example, for a coil core, are punched out of the band 103. The punched sheets are stacked to stamped parts stacks 106, wherein the stack then enter into an annealing furnace 107. After a defined cycle time at 650 ° C to 750 ° C enter the stamped parts stack 106 in a blast furnace 108. In the blast furnace 108, an atmosphere is set in the interior 109, in which the dew point is> 10 ° C and in particular at> 20 ° C, wherein the atmosphere at about 500 ° C temperature is oxidizing. After the predetermined adequate throughput time the punching partial stacks are used as a finished product stack 110 out of the Bläuungsofen, wherein the finished products have a mixed layer film of Fe 2 O 3 and Fe 3 O 4 are each approximately half, wherein the film coating thickness is usually 200 nm.

Bei den bisherigen Verfahren ist von Nachteil, dass die Isolation mit Lacken relativ aufwendig ist und bei Lacken grundsätzlich Problematiken bezüglich der Umwelt auftreten, insbesondere auch, was eine spätere Entsorgung betreffen kann.In the previous method is a disadvantage that the insulation with paints is relatively expensive and paint problems generally occur in the environment, in particular, which may affect a subsequent disposal.

Beim Bläuen ist von Nachteil, dass dies ebenfalls ein zusätzlicher Arbeitsschritt ist, wobei zusätzlich die Isolationsleistung beim Bläuen hinter der des Lackierens zurückbleibt und zudem derartige Prozesse oft beim Anwender durchgeführt werden, ohne dass die Eigenschaften wirklich zuverlässig gleich bleibend wären.When blueing is disadvantageous that this is also an additional step, in addition, the insulation performance when blueing behind the painting remains behind and also such processes are often performed by the user, without the properties would be really reliable consistent.

Es ist Aufgabe der Erfindung, ein Verfahren zum Herstellen eines Elektrobandes zu schaffen, welches einfach und kostengünstig durchführbar ist, eine Isolierschicht mit einer zuverlässigen Isolierung mit gut kontrollierbaren gleichbleibenden Eigenschaften sicherstellt und zudem kostengünstig ist.It is an object of the invention to provide a method for producing an electrical steel, which is simple and inexpensive to carry out, an insulating layer with a reliable insulation ensures good controllable consistent properties and is also inexpensive.

Die Aufgabe wird mit einem Verfahren mit den Merkmalen des Anspruchs 1 gelöst.The object is achieved by a method having the features of claim 1.

Vorteilhafte Weiterbildungen sind in den Unteransprüchen gekennzeichnet.Advantageous developments are characterized in the subclaims.

Es ist eine weitere Aufgabe der Erfindung, ein Elektroband zu schaffen, das mit einer guten Isolierung ausgebildet ist und ohne weitere Nachbearbeitung zur Herstellung von Blechpaketen verwendbar ist.It is a further object of the invention to provide an electrical steel which is formed with good insulation and can be used without further post-processing for the production of laminated cores.

Die Aufgabe wird mit einem Elektroband mit den Merkmalen des Anspruchs 7 gelöst.The object is achieved with an electrical steel with the features of claim 7.

Vorteilhafte Weiterbildungen sind in den hiervon abhängigen Unteransprüchen gekennzeichnet.Advantageous developments are characterized in the dependent claims.

Erfindungsgemäß wird das Elektroband bereits beim Stahlhersteller in einem kontinuierlichen Prozess und insbesondere während des Rekristallisationsglühens in einer kontinuierlichen Glühe (Kontiglühe) mit einer isolierenden Schicht ausgebildet. Hierbei nimmt das Elektroband tatsächlich eine blaue Farbe an, wobei jedoch die isolierende Schicht gegenüber einer üblicherweise gebläuten Schicht erheblich besser isoliert. Die erfindungsgemäß hergestellten Elektrobänder besitzen eine Isolierschichtauflage von lediglich 100 nm, wobei diese Schicht ganz wesentlich aus Fe3O4 ausgebildet ist. Die Schicht enthält nur sehr wenig Fe2O3, wobei das Fe3O4 offensichtlich für die isolierende Leistung zuständig ist, denn eine 100 nm dicke erfindungsgemäß gebläute Schicht isoliert besser als eine übliche 200 nm dicke gebläute Schicht.According to the invention, the electrical steel is already formed at the steel manufacturer in a continuous process and in particular during the recrystallization annealing in a continuous annealing (continuous annealing) with an insulating layer. In this case, the electrical steel actually assumes a blue color, but the insulating layer is much better isolated than a bleached layer. The electrical tapes produced according to the invention have an insulating layer of only 100 nm, this layer being formed substantially entirely of Fe 3 O 4 . The layer contains only very little Fe 2 O 3 , wherein the Fe 3 O 4 obviously is responsible for the insulating performance, because a 100 nm thick according to the invention blued layer better isolated than a conventional blued layer 200 nm thick.

Mit dieser Isolierleistung kann das erfindungsgemäß hergestellte gebläute Elektroband das übliche Lackieren überflüssig machen, was einen erheblichen Kostenvorteil gegenüber lackierten Blechen darstellt.With this insulating performance, the blued electrical steel produced according to the invention can make the usual painting superfluous, which represents a significant cost advantage over painted sheets.

Das erfindungsgemäße Verfahren sieht vor, das Elektroband beim Eintritt in die Schlusskühlzone, in der es eine Temperatur zwischen 450°C und 500°C besitzt, mit Pressluft zu beaufschlagen. Hierbei wird eine Sauerstoffkonzentration zwischen 0,05 % und 0,2 % Sauerstoff gemessen im Ofenraum der Schlusskühlzone eingestellt. Die absolute Gleichmäßigkeit der erzielten Oxidschicht wird einerseits durch das Einbringen der Pressluft in die Gebläsegehäuse der Schlusskühlgebläse und andererseits durch die Bandtemperatur sowie die Sauerstoffkonzentration sichergestellt.The process according to the invention provides for pressurized air to be applied to the electrical steel strip as it enters the final cooling zone in which it has a temperature between 450 ° C. and 500 ° C. Here, an oxygen concentration between 0.05% and 0.2% oxygen measured in the furnace chamber of the final cooling zone is set. The absolute uniformity of the oxide layer achieved is ensured on the one hand by the introduction of the compressed air into the blower housing of the final cooling fan and on the other hand by the belt temperature and the oxygen concentration.

Zudem wird erfindungsgemäß das Einblasen der Pressluft und das Einstellen des Sauerstoffgehalts so durchgeführt, dass der Taupunkt auf unter -40°C und eine reduzierende Atmosphäre eingestellt wird.In addition, according to the invention, the injection of the compressed air and the adjustment of the oxygen content are carried out so that the dew point is set below -40 ° C and a reducing atmosphere.

Im Gegensatz zu der beim üblichen Bläuen oxidierenden Atmosphäre mit Wasser bei Taupunkten von > 10°C wird mit dem erfindungsgemäßen Verfahren eine Schicht erzielt, die bei erheblich geringerer Dicke einen Fe3O4-Anteil von 90 % und mehr aufweist und bei der reduzierten Dicke ein derart höheres Isolationsvermögen besitzt, dass es ohne Weiteres als Ersatz für lackierte Elektrobleche verwendet werden kann.In contrast to the usual blue-oxidizing atmosphere with water at dew points of> 10 ° C is achieved by the method according to the invention, a layer having a significantly lower thickness Fe 3 O 4 content of 90% and more and at the reduced thickness has such a higher insulation capacity, that it can be used without difficulty as a replacement for painted electrical steel sheets.

Bei dem erfindungsgemäßen Verfahren wird zudem eine sehr hohe Gleichmäßigkeit sowohl bezüglich der Isolationsleistung und Zusammensetzung der Schicht als auch der Dicke der Schicht erreicht.In addition, in the method according to the invention, a very high degree of uniformity, both with regard to the insulation performance and the composition of the layer and the thickness of the layer, is achieved.

Die Erfindung wird anhand einer Zeichnung erläutert. Es zeigen dabei:

Figur 1:
den erfindungsgemäßen Verfahrensablauf in einer stark schematisierten Ansicht;
Figur 2:
den Verfahrensablauf nach dem Stand der Technik in einer stark schematisierten Ansicht.
The invention will be explained with reference to a drawing. It shows:
FIG. 1:
the process sequence according to the invention in a highly schematic view;
FIG. 2:
the process flow according to the prior art in a highly schematic view.

Bei dem erfindungsgemäßen Verfahren wird insbesondere eine kontinuierliche Glühanlage 1 verwendet. Hierbei wird zunächst von einem Bund 2 aus aufgerolltem Stahlband 3 das Stahlband 3 bei einer Abhaspelstation 4 abgehaspelt und sodann durch eine Bandreinigungsanlage 5 geführt. Von der Bandreinigungsanlagen 5 gelangt das Stahlband 3 in einen Einlaufspeicher 6. Der an sich bekannte Einlaufspeicher 6 hat die Aufgabe, den Lauf des Stahlbandes 3 durch die nachfolgenden Aggregate zu vergleichmäßigen, denn um einen kontinuierlichen Prozess sicherzustellen, wird an der Abhaspelstation 4 nach dem Abhaspeln eines ersten Stahlbundes ein nächster Stahlbund abgehaspelt und das vordere Ende des neuen Stahlbundes an das hintere Ende des alten Stahlbundes angeschweißt, um auch das neue Stahlband 3 durch die kontinuierlichen Anlage durchzuziehen. Vom Einlaufspeicher 6 gelangt das Stahlband 3 in den eigentlichen Glühofen bzw. die eigentliche Glühvorrichtung 7. Hierbei gelangt das Stahlband zunächst in eine Heiz- und Kühlzone 8 und gelangt aus der Heiz- und Kühlzone 8 in eine sogenannte Überalterungszone 9. Von der Überalterungszone 9 gelangt das Stahlband 3 in eine abschließende Strahlkühlzone 10, wobei das Band mit etwa 450°C bis 500°C aus der Überalterungszone 9 in die abschließende Strahlkühlzone eingeführt wird. In der abschließenden Strahlkühlzone findet erfindungsgemäß eine Beaufschlagung des Stahlbandes 3 mit Pressluft in entsprechenden Bereichen 11 statt, wobei die Atmosphäre 12 bzw. im Innenraum 12 sowohl der Überalterungszone als auch in der abschließenden Strahlkühlzone der Taupunkt auf unter -20°C, insbesondere unter -40°C und bevorzugt unter -50°C eingestellt wird. Anschließend läuft das Stahlband 3 aus der abschließenden Strahlkühlung aus und gelangt in einen Auslaufspeicher 13, welcher die Aufgabe hat, Stahlband 3 aufzunehmen, während ein erstes Stahlband aufgehaspelt wurde und das nachfolgende zweite Stahlband vom ersten Stahlband getrennt wird, um anschließend aufgehaspelt zu werden.In the method according to the invention, in particular a continuous annealing plant 1 is used. Here, the steel strip 3 is first unwound at a Abhaspelstation 4 and then passed through a belt cleaning system 5 of a covenant 2 from rolled steel strip 3. From the belt cleaning equipment 5, the steel strip 3 enters an inlet storage 6. The known inlet storage 6 has the task to equalize the running of the steel strip 3 by the following aggregates, because to ensure a continuous process is at the Abhaspelstation 4 after uncoiling The first steel bundle was unwound from a steel bundle and the front end of the new steel collar was welded to the rear end of the old steel collar in order to pass the new steel strip 3 through the continuous system. From the inlet storage 6, the steel strip 3 enters the actual annealing furnace or the actual annealing device 7. The steel strip first passes into a heating and cooling zone 8 and passes from the heating and cooling zone 8 into a so-called over-age zone 9. From the overaging zone 9 passes the steel strip 3 in a final jet cooling zone 10, wherein the strip is introduced at about 450 ° C to 500 ° C from the overaging zone 9 in the final jet cooling zone. According to the invention, in the final jet cooling zone, the steel strip 3 is subjected to pressurized air in corresponding regions 11, the atmosphere 12 or in the interior 12 of both the overaging zone and in the final jet cooling zone having a dew point below -20 ° C., in particular below -40 ° ° C and preferably below -50 ° C is set. Subsequently, the steel strip 3 runs out of the final jet cooling and arrives in a discharge storage 13, which has the task of picking up steel strip 3, while a first steel strip was unwound and the subsequent second Steel strip is separated from the first steel strip to be subsequently rewound.

Das Stahlband 3 durchläuft ein anschließendes Dressierband 14, um dann an einer Aufhaspelstation 15 wieder zu einem Coil 16 aufgehaspelt zu werden.The steel strip 3 passes through a subsequent tempering 14, to then be rewound at a Aufhaspelstation 15 to a coil 16.

Bei der Erfindung ist von Vorteil, dass die Bläuung bzw. die Erzeugung einer isolierenden Oxidschicht auf der Oberfläche des Stahlbandes zur Verwendung als Elektrostahlband in einer sehr hohen Gleichmäßigkeit und mit einer überragenden Güte derart erfolgt, dass die Isolationsleistung der Oxidschicht aufgrund der Zusammensetzung aus über 90% Fe3O4 eine überragende Isolationsleistung bereits bei Schichtauflagen von lediglich 100 nm ergibt.In the invention, it is advantageous that the bluing or the production of an insulating oxide layer on the surface of the steel strip for use as an electrical steel strip in a very high uniformity and with a superior quality such that the insulation performance of the oxide layer due to the composition of over 90 % Fe 3 O 4 results in an outstanding insulation performance even with layer runs of only 100 nm.

Damit ist das erfindungsgemäß erzeugte Elektroband mit einer Oxidschichtauflage in der Lage, erheblich teurer hergestellte lackierte Elektrobänder zu ersetzen.Thus, the electrical strip produced according to the invention with an oxide layer support is able to replace painted electrically-coated strips produced considerably more expensive.

Zudem fallen beim Endkunden Lackieranlagen oder Bläuungsanlagen weg, was einerseits einen Investitionsvorteil gewährt, andererseits - insbesondere bei beim Kunden vorhandenen Bläuungsanlagen - den Vorteil bietet, dass das erfindungsgemäß mit der Oxidschicht versehene Stahlband von erheblich besserer Qualität ist als ein Stahlband, welches in herkömmlichen Bläuungsöfen beim Kunden herstellbar ist.In addition, the end customer Lackieranlagen or Bläuungsanlagen away, on the one hand grants an investment advantage, on the other hand - especially at the customer existing Bläuungsanlagen - offers the advantage that the inventively provided with the oxide layer steel strip of significantly better quality than a steel strip, which in conventional Bläuungsöfen the Customers can be produced.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11 kontinuierliche Glühanlagecontinuous annealing plant 22 BundFederation 33 Stahlbandsteel strip 44 Abhaspelstationuncoiling 55 BandreinigungsanlageBelt cleaning system 66 Einlaufspeicherentry accumulator 77 Glühvorrichtungannealing device 88th Heiz- und KühlzoneHeating and cooling zone 99 ÜberalterungszoneOveraging zone 1010 StrahlkühlzoneJet cooling zone 1111 Bereicheareas 1212 Atmosphärethe atmosphere 1313 Auslaufspeicheroutlet store 1414 DressierbandDressierband 1515 Aufhaspelstationcoiling 1616 Coilcoil 101101 BläuungsanlageBläuungsanlage 102102 BundFederation 103103 Stahlbandsteel strip 104104 Abhaspelstationuncoiling 105105 Stanzepunch 106106 StanzteilstapelStamping stack 107107 Glühofenannealing furnace 108108 BläuungsofenBläuungsofen 109109 Innenrauminner space 110110 fertiger Produktstapelfinished product stack

Claims (9)

  1. A method for manufacturing an electrical steel strip, in particular a steel strip coated with an iron oxide for use as an electrical steel sheet for the electrical industry, wherein in a continuous annealing process, the sheet steel strip, upon entry from an overaging zone, is introduced into the final cooling zone with a temperature of between 450°C and 550°C in the treatment chamber and in this chamber, is acted on with an oxygen concentration of between 0.05% and 0.2% oxygen, measured in the final cooling zone; the dew point of water set to -10°C; and the furnace chamber has a reducing atmosphere.
  2. The method as recited in claim 1, characterized in that the method is carried out so that the oxide layer forming on the surface of the electrical steel strip has a thickness of less than 150 nm.
  3. The method as recited in claim 1 or 2, characterized in that the oxide layer thickness is set to less than or equal to 100 nm.
  4. The method as recited in one of the preceding claims, characterized in that the ratio of Fe304 to Fe2O3 in the oxide layer is at least 9:1.
  5. The method as recited in one of the preceding claims, characterized in that the method is carried out in the final cooling zone of a continuous recrystallization annealing system.
  6. The method as recited in one of the preceding claims, characterized in that the dew point is set to less than -40°C.
  7. An electrical steel strip for use in the electrical industry as an armature lamination for laminated armature cores and the like, manufactured using a method as recited in one of the preceding claims, characterized in that the electrical steel strip has an oxide layer on its surface and the oxide layer contains more than 90% Fe3O4 and the oxide layer deposit is less than or equal to 150 nm thick.
  8. The electrical steel strip as recited in claim 7, characterized in that the oxide layer deposit is less than or equal to 100 nm thick.
  9. A use of an electrical steel strip as recited in one of the preceding claims 7 or 8, manufactured using a method as recited in one of claims 1 through 6 for manufacturing laminated sheet metal cores with sheets that are insulated from one another for stators and rotors of electric motors, generators, and the like.
EP09756690.5A 2008-12-12 2009-10-23 Method for producing an improved electrical steel strip Not-in-force EP2356263B1 (en)

Priority Applications (2)

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SI200930672T SI2356263T1 (en) 2008-12-12 2009-10-23 Method for producing an improved electrical steel strip
PL09756690T PL2356263T3 (en) 2008-12-12 2009-10-23 Method for producing an improved electrical steel strip

Applications Claiming Priority (2)

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DE102008061983A DE102008061983B4 (en) 2008-12-12 2008-12-12 Method for producing an improved electrical steel strip, electrical steel strip and its use
PCT/EP2009/063964 WO2010066497A1 (en) 2008-12-12 2009-10-23 Method for producing an improved electrical steel strip

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EP2356263A1 EP2356263A1 (en) 2011-08-17
EP2356263B1 true EP2356263B1 (en) 2013-05-22

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KR (1) KR20110111404A (en)
BR (1) BRPI0916493A2 (en)
DE (1) DE102008061983B4 (en)
PL (1) PL2356263T3 (en)
RU (1) RU2499845C2 (en)
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DE102013019787A1 (en) * 2013-11-27 2015-05-28 Valeo Schalter Und Sensoren Gmbh Method for producing a ferromagnetic component for a torque sensor of a vehicle steering shaft and torque sensor
GB2555104B (en) * 2016-10-14 2022-06-01 Liberty Performance Steels Ltd Manufacture of a stress relieved length of steel having an oxidised surface layer
JP6944146B1 (en) * 2020-08-03 2021-10-06 トヨタ紡織株式会社 Heat treatment method and heat treatment furnace

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US4030950A (en) * 1976-06-17 1977-06-21 Allegheny Ludlum Industries, Inc. Process for cube-on-edge oriented boron-bearing silicon steel including normalizing
SU667595A1 (en) * 1978-01-30 1979-06-15 Предприятие П/Я Г-4012 Method of heat treatment of magnetic core sheets
JPS55158220A (en) * 1979-05-24 1980-12-09 Nippon Steel Corp Forming method of insulating film excellent in heat resistance on electrical sheet
JPS60121222A (en) * 1983-12-02 1985-06-28 Kawasaki Steel Corp Production of grain-oriented silicon steel sheet
JPS6213530A (en) * 1985-07-12 1987-01-22 Hitachi Ltd Simultaneously processing device for annealing and bluing electromagnetic sheet for closed type compressor
RU2049127C1 (en) * 1993-02-23 1995-11-27 Чекалов Виталий Петрович Method for heat treatment of sheets of magnetic circuit
JPH08337824A (en) * 1995-06-08 1996-12-24 Nippon Steel Corp Production of silicon steel sheet for laminated silicon steel
US6221501B1 (en) * 1999-08-17 2001-04-24 Ltv Steel Company, Inc. Steel with electrically insulating hematite layer
JP2004043941A (en) * 2002-07-16 2004-02-12 Nippon Steel Corp Method and apparatus for continuously annealing steel sheet with little discoloration
DE10258531B3 (en) * 2002-12-14 2004-04-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Production of a steel with a corrosion protection coating used in the production of an automobile chassis comprises annealing the steel, treating the surface of the steel using high energy, and coating the surface of the steel
US7361238B1 (en) * 2004-06-01 2008-04-22 Tempel Steel Company Annealing furnace purging and oxidation system and method

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WO2010066497A1 (en) 2010-06-17
RU2011128544A (en) 2013-01-20
RU2499845C2 (en) 2013-11-27
PL2356263T3 (en) 2013-10-31
JP2012511628A (en) 2012-05-24
US20110297292A1 (en) 2011-12-08
DE102008061983A1 (en) 2010-06-17
SI2356263T1 (en) 2013-09-30
DE102008061983B4 (en) 2011-12-08
BRPI0916493A2 (en) 2016-02-16
EP2356263A1 (en) 2011-08-17

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