EP0651061A1 - Process for producing grain-oriented electrical strips and magnetic cores produced therefrom - Google Patents
Process for producing grain-oriented electrical strips and magnetic cores produced therefrom Download PDFInfo
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- EP0651061A1 EP0651061A1 EP94116869A EP94116869A EP0651061A1 EP 0651061 A1 EP0651061 A1 EP 0651061A1 EP 94116869 A EP94116869 A EP 94116869A EP 94116869 A EP94116869 A EP 94116869A EP 0651061 A1 EP0651061 A1 EP 0651061A1
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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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
-
- 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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1227—Warm rolling
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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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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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
- 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
- C21D8/1266—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 between cold rolling steps
Definitions
- the invention relates to a method for producing grain-oriented electrical steel with easy magnetization in four directions in the roller plane and magnetic cores produced therefrom for rotating and non-rotating electrical machines.
- DE-AS 1212124 describes a process with which an electrical steel is produced using a primary material with 2-5% Si content, the structure orientation of which is characterized in that two surfaces the elementary cube is parallel to the sheet surface and the cube edges lying in the sheet plane are piled up by at least four excellent directions or have an almost random distribution.
- the material is annealed, hot-rolled, pickled and then cold-rolled in one or more steps, the cold rolling step or the last cold rolling step being carried out with a degree of deformation of> 90%.
- a cube surface texture with an almost random cube edge distribution in the roll plane can be achieved if after cold rolling with> 90% degree of deformation and an intermediate annealing treatment, the material is cold-formed again in one step or in several stages by 30 to 80%. 1100 ° C, several hours of annealing time and hydrogen atmosphere are specified for the final annealing.
- the intermediate annealing takes place according to the process at temperatures between 800 and 1100 ° C. This process for the production of grain-oriented electrical steel is very complex due to the necessary technological steps, intermediate annealing at 800 - 1100 ° C, several deformation stages and the specified material composition.
- the object of the invention is to find a method with which the production of grain-oriented electrical steel with an enrichment of cube surfaces or nearer layers in the rolling plane and an accumulation of the cube edges in directions which are approximately 45 ° to the rolling direction is possible and the production thereof manufactured magnetic cores for electrical machines can be improved.
- the 200 - 300 mm thick steel slabs of this composition are preheated to approx. 1250 ° C and then hot-rolled in 5 to 9 stitches with small single stitch decreases in a roughing mill, the stitch decreases ⁇ 20% for the first two and ⁇ 30% for the following stitches.
- the material When entering the finishing line, the material has a temperature between 930 ° C and 1100 ° C, preferably ⁇ 1000 ° C when using unalloyed steel and preferably between 1000 ° C and 1100 ° C when using Si-alloyed steel.
- the final rolling temperature is between 800 ° C and 950 ° C, preferably between 840 ° C and 870 ° C for unalloyed material and preferably up to 920 ° C for alloyed materials, the stitch decreases during finish rolling not exceeding 35%.
- the finished strip produced in this way is then coiled at a reel temperature of> 700 ° C without forced cooling.
- the hot strip thickness should be selected so that degrees of deformation of> 86%, preferably> 90%, can be achieved in the subsequent cold forming.
- Thinner slabs in particular those produced using the thin slab casting technology, are hot-rolled analogously, with the result of the lower deformation rates, the stitch decreases can be about 10% higher. It was found that with a hot strip produced in this way, the desired microstructure formation can be made considerably more economical by the subsequent cold forming. According to the process, it is advantageous if the cold forming which takes place after the usual pickling in several passes begins at elevated temperatures in the range from 150 ° C. to 350 ° C., preferably between 200 ° C. and 300 ° C.
- the strip, cold-formed with a degree of deformation> 86%, is then annealed for 0.5 to 20 h at 500 ° C. to 750 ° C. under neutral gas, preferably 1 to 5 h around 550 ° C. for unalloyed and at 620 ° C. to 680 ° C. for silicon alloy material.
- the material is subjected to a further cold working of 2 to 15%, preferably 6 to 12% (tempered) and then finally annealed at temperatures around 800 ° C., depending on the composition, at or slightly above AG 1 in an at least temporarily decarburizing atmosphere. It has proven to be advantageous if the strip produced in this way is treated a second time and finally annealed.
- the final annealing can be carried out on the belt (fully finished) as well as on the stamped part or after packaging (semifinished).
- the grain-oriented electrical steel produced according to the method is characterized by four magnetic preferred directions, which are at 45 ° to the rolling direction in the plane of the sheet.
- This structure formation, avoiding high-temperature annealing, can be designated with a structure orientation (001) ⁇ 110 ⁇ .
- the tape is particularly suitable for applications in which the magnetic flux is guided in two mutually perpendicular directions. That is e.g. B. in stand packages rotating or non-rotating electrical machines the case.
- the punched parts required for this are punched out of the band-shaped material and assembled into a package, taking into account the course of the four preferred directions of easy magnetization.
- the core sheets for magnetic cores for rotating electrical machines can be made from circular blanks, which are each assembled into a package so that successive core sheets are each rotated by 45 ° to one another.
- segments for magnetic cores for rotating electrical machines the individual segments are punched out of the band-shaped electrical steel strip so that the directions of easy magnetizability are detected by them.
- Magnetic cores produced in this way have significantly lower manufacturing and processing costs and better magnetic properties than stamped parts used to date.
- An unalloyed steel slab with a C content of 0.07% and a thickness of 250 mm is preheated to 1250 ° C and rolled in 7 passes to 32 mm. Finishing rolling is done in 5 passes at an inlet temperature of 965 ° C and a finish rolling temperature of 840 ° C, with a single pass decrease of ⁇ 30% to 5.6 mm with subsequent air cooling.
- the pickled strip is annealed to 0.55 mm (degree of deformation 90%) at 560 ° C for 2 hours and then treated with 6%. This material is then subjected to a final annealing at 780 ° C, one hour in moist and four hours in dry H2.
- the grain-oriented electrical steel produced afterwards has the following values for ⁇ 2500 (T):
- a Si alloy steel slab with a Si content of 1.1% and a C content of 0.05% and a thickness of 250 mm is preheated to a temperature of 1250 ° C and heated in the same way with regard to the number of stitches and the degree of deformation - and cold rolled as in Example A, but with the following parameters changed: Inlet temperature of finish rolls 1080 ° C Finish rolling temperature 895 ° C Intermediate annealing temperature 660 ° C (2h)
- Example A An unalloyed steel slab as in Example A, however, is hot-rolled at a slightly higher temperature, then cold-rolled and annealed, with the first tempering (10%) followed by another intermediate annealing at 780 ° C / 2 h in dry H2 and then the strip undergoes a further 10% cold working. The final annealing takes place at 780 ° C / 1 h in moist and 4 h in dry H2.
- the grain-oriented electrical steel produced after this has the following values for J 2500 (T): ⁇ 0 ° 15 ° 30 ° 45 ° 60 ° 75 ° 90 ° 1 trained 1.69 1.71 1.77 1.79 1,735 1,675 1.63 Trained twice 1.63 1.71 1.83 1.87 1.805 1.67 1.58
- the grain-oriented electrical steel produced according to the invention is particularly suitable for applications in which the magnetic flux is conducted in two directions perpendicular to one another.
- the stamped parts required for the construction of the magnetic bodies are manufactured from the strip material in accordance with the arrangement of the sectional shapes shown in FIG. 1, the beams 1, 2, 3, 4 characterizing the four directions of easier magnetization.
- the magnetic cores for rotating electrical machines are manufactured in such a way that either immediately successive core sheets are arranged at 45 ° to one another or that, according to FIG. 2, the magnetic core is made up of segments, the segments capturing the angles of easy magnetization.
- the magnetic cores produced afterwards are characterized by better magnetic properties.
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Abstract
Description
Die Erfindung betrifft ein Verfahren zur Erzeugung von kornorientiertem Elektroband mit in vier Richtungen leichter Magnetisierbarkeit in der Walzebene und daraus hergestellte Magnetkerne für umlaufende und nicht umlaufende Elektromaschinen.The invention relates to a method for producing grain-oriented electrical steel with easy magnetization in four directions in the roller plane and magnetic cores produced therefrom for rotating and non-rotating electrical machines.
Verfahren zur Herstellung von kornorientierten Elektrobändern mit sogenannter GOSS-Textur {011}〈100〉 sind bekannt. Gemäß diesen Verfahren erfolgt die Ausrichtung der Elementarwürfel derart, daß eine Würfelkante eines Elementarwürfels in Walzrichtung liegt und zwei zueinander parallele Flächendiagonale in der Walzebene angeordnet sind. Auf diese Weise hergestelltes Material weist eine gute Magnetisierbarkeit in Walzrichtung auf. Als nachteilig tritt jedoch die schlechte Magnetisierbarkeit des Materials senkrecht zur Walzrichtung in Erscheinung. Zur Herstellung von kornorientiertem Elektroband mit anderer als GOSS-Textur ist in der DE-AS 1212124 ein Verfahren beschrieben, mit dem unter Verwendung eines Vormaterials mit 2 - 5 % Si-Gehalt ein Elektroband erzeugt wird, dessen Gefügeorientierung dadurch gekennzeichnet ist, daß zwei Flächen der Elementarwürfel parallel zur Blechoberfläche liegen und die in der Blechebene liegenden Würfelkanten sich um mindestens vier ausgezeichnete Richtungen häufen oder eine nahezu regellose Verteilung aufweisen. Verfahrensgemäß wird das Material geglüht, warmgewalzt, gebeizt und anschließend in einem oder mehreren Schritten kaltgewalzt, wobei der Kaltwalzschritt oder der letzte Kaltwalzschritt mit einem Verformungsgrad von über >90 % erfolgt. Eine Würfelflächentextur mit einer nahezu regellosen Würfelkantenverteilung in der Walzebene läßt sich danach erreichen, wenn nach dem Kaltwalzen mit > 90 % Verformungsgrad und einer Zwischenglühbehandlung das Material nochmals in einem Schritt oder in mehreren Stufen um 30 bis 80 % kaltverformt wird. Für die Schlußglühung werden 1100 °C, mehrere Stunden Glühzeit und Wasserstoffatmosphäre angegeben. Die Zwischenglühungen erfolgen verfahrensgemäß bei Temperaturen zwischen 800 und 1100 °C. Dieses Verfahren zur Herstellung von kornorientiertem Elektroband ist auf Grund der erforderlichen technologischen Schritte, Zwischenglühungen bei 800 - 1100 °C, mehrere Verformungsstufen sowie der vorgegebenen Materialzusammensetzung sehr aufwendig. Insbesondere das Glühen der Bunde bei Temperaturen bis 1100 °C und einer Glühdauer von 5 Stunden erfordert Maßnahmen zur Vermeidung von Klebern, wodurch das Verfahren zusätzlich in seiner Wirtschaftlichkeit negativ beeinflußt wird. Weiterhin haben Versuche unter Anwendung des Verfahrens gezeigt, daß Kaltwalzgrade > 90 % nicht zwangsläufig zu einer scharfen vierzähligen Orientierungsausbildung im Material führen.Processes for producing grain-oriented electrical steel strips with a so-called GOSS texture {011} 〈100〉 are known. According to these methods, the elementary cubes are aligned in such a way that a cube edge of an elementary cube lies in the rolling direction and two mutually parallel surface diagonals are arranged in the rolling plane. Material produced in this way has good magnetizability in the rolling direction. A disadvantage, however, is the poor magnetizability of the material perpendicular to the rolling direction. For the production of grain-oriented electrical steel with a texture other than GOSS, DE-AS 1212124 describes a process with which an electrical steel is produced using a primary material with 2-5% Si content, the structure orientation of which is characterized in that two surfaces the elementary cube is parallel to the sheet surface and the cube edges lying in the sheet plane are piled up by at least four excellent directions or have an almost random distribution. According to the method, the material is annealed, hot-rolled, pickled and then cold-rolled in one or more steps, the cold rolling step or the last cold rolling step being carried out with a degree of deformation of> 90%. A cube surface texture with an almost random cube edge distribution in the roll plane can be achieved if after cold rolling with> 90% degree of deformation and an intermediate annealing treatment, the material is cold-formed again in one step or in several stages by 30 to 80%. 1100 ° C, several hours of annealing time and hydrogen atmosphere are specified for the final annealing. The intermediate annealing takes place according to the process at temperatures between 800 and 1100 ° C. This process for the production of grain-oriented electrical steel is very complex due to the necessary technological steps, intermediate annealing at 800 - 1100 ° C, several deformation stages and the specified material composition. In particular, the annealing of the coils at temperatures up to 1100 ° C and an annealing time of 5 hours requires measures to avoid them of adhesives, which also has a negative impact on the economy of the process. Furthermore, tests using the method have shown that degrees of cold rolling> 90% do not necessarily lead to a sharp fourfold orientation formation in the material.
Aufgabe der Erfindung ist es ein Verfahren zu finden, mit dem die Erzeugung von kornorientiertem Elektroband mit einer Anreicherung von Würfelflächen oder ihnen naher Lagen in der Walzebene sowie eine Häufung der Würfelkanten in Richtungen die etwa 45 ° zur Walzrichtung liegen, möglich ist und die Fertigung daraus hergestellter Magnetkerne für Elektromaschinen verbessert werden kann.The object of the invention is to find a method with which the production of grain-oriented electrical steel with an enrichment of cube surfaces or nearer layers in the rolling plane and an accumulation of the cube edges in directions which are approximately 45 ° to the rolling direction is possible and the production thereof manufactured magnetic cores for electrical machines can be improved.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß ein Stahl mit einem
Kohlenstoffgehalt von C < 0,10 %
vorzugsweise mit C = 0,02 - 0,07 %
einem Si-Gehalt von Si = 0 - 2 %
und Gehalten an Al, Mn, S, N, O in den für Elektroband üblichen Konzentrationen verwendet wird. Gemäß diesem Verfahren werden die 200 - 300 mm dicken Stahlbrammen dieser Zusammensetzung auf ca. 1250 °C vorgewärmt und anschließend in 5 bis 9 Stichen bei geringen Einzelstichabnahmen in einer Vorstraße warmgewalzt, wobei die Stichabnahmen < 20 % für die ersten beiden und < 30 % für die folgenden Stiche betragen. Bei Einlauf in die Fertigstaffel weist das Material eine Temperatur zwischen 930 °C und 1100 °C auf, vorzugsweise < 1000 °C bei Einsatz von unlegiertem Stahl und vorzugsweise zwischen 1000 °C und 1100 °C bei Einsatz von Si-legiertem Stahl. Die Endwalztemperatur liegt verfahrensgemäß zwischen 800 °C und 950 °C, bei unlegiertem Material vorzugsweise zwischen 840 °C und 870 °C und bei legiertem vorzugsweise bis 920 °C, wobei die Stichabnahmen beim Fertigwalzen 35 % nicht übersteigen. Das so hergestellt Fertigband wird ohne Zwangskühlung anschließend bei einer Haspeltemperatur von > 700 °C gehaspelt. In Abhängigkeit von der gewünschten Kaltbanddicke in Bereich von 0.1 bis 0,6 mm ist die Warmbanddicke zu zu wählen, daß bei der folgenden Kaltverformung Verformungsgrade von > 86 % vorzugsweise > 90 % erreicht werden können. Dünnere Brammen, insbesondere solche nach der Dünnbrammengießwalztechnologie hergestellte, werden analog warmgewalzt, wobei hier aufgrund der geringeren Formänderungsgeschwindigkeiten, die Stichabnahmen jeweils um ca. 10 % höher liegen können. Es wurde gefunden, daß mit einem derart hergestellten Warmband die angestrebte Gefügeausbildung durch das anschließende Kaltverformen wesentlich wirtschaftlicher gestaltet werden kann. Verfahrensgemäß ist es vorteilhaft, wenn die nach dem üblichen Beizen in mehreren Stichen erfolgende Kaltverformung bei erhöhten Temperaturen im Bereich von 150 °C bis 350 °C beginnt, vorzugsweise zwischen 200 °C und 300 °C. Das mit einem Umformgrad > 86 % kaltverformte Band wird anschließend 0,5 bis 20 h bei 500 °C bis 750 °C unter neutralem Gas geglüht, vorzugsweise 1 bis 5 h um 550 °C für unlegiertes und bei 620 °C bis 680 °C für Si- legiertes Material. Nach dieser Zwischenglühung wird das Material einer weiteren Kaltverformung von 2 bis 15 %, vorzugsweise 6 bis 12 % unterzogen (dressiert) und anschließend bei Temperaturen um 800 °C je nach Zusammensetzung bei oder etwas oberhalb AG 1 in wenigstens zeitweise entkohlender Atmosphäre schlußgeglüht. Es hat sich als günstig erwiesen, wenn das so erzeugte Band ein zweites Mal dressiert und schlußgeglüht wird. Die Schlußglühung kann sowohl am Band (fully finished) als auch am Stanzteil bzw. nach dem Paketieren (Semifinished) vorgenommen werden. Das verfahrensgemäß hergestellte kornorientierte Elektroband ist gekennzeichnet durch vier magnetische Vorzugsrichtungen, die unter 45 ° zur Walzrichtung in der Blechebene liegen. Diese unter Vermeidung von Hochtemperaturglühungen erzeugte Gefügeausbildung kann mit einer Gefügeorientierung (001)〈110〉 bezeichnet werden. Das Band ist besonders geeignet für Einsatzfälle, in denen der Magnetfluß in zwei zueinander senkrechten Richtungen geführt wird. Das ist z. B. in Ständerpaketen umlaufender oder nicht umlaufender Elektromaschinen der Fall. Die dazu benötigten Stanzteile werden, unter Beachtung des Verlaufs der vier Vorzugsrichtungen leichter Magnetisierbarkeit, aus dem bandförmigen Material ausgestanzt und zu einem Paket zusammengefügt. Die Kernbleche für Magnetkerne für umlaufende Elektromaschinen können dabei aus Ronden gefertigt sein, die jeweils so zu einem Paket zusammengefügt sind daß jeweils unmittelbar aufeinanderfolgende Kernbleche zueinander um 45° gedreht angeordnet sind. Beim Einsatz von Segmenten für Magnetkerne für umlaufende Elektromaschinen werden die einzelnen Segmente so aus dem bandförmigen Elektroband ausgestanzt, daß durch sie die Richtungen der leichten Magnetisierbarkeit erfaßt werden. Derartig hergestellte Magnetkerne weisen gegenüber bisher eingesetzten Stanzteilen einen bedeutend geringeren Herstellungs- und Verarbeitungsaufwand sowie bessere magnetische Eigenschaften auf.According to the invention the object is achieved in that a steel with a
Carbon content of C <0.10%
preferably with C = 0.02 - 0.07%
a Si content of Si = 0-2%
and contents of Al, Mn, S, N, O in the concentrations customary for electrical steel are used. According to this process, the 200 - 300 mm thick steel slabs of this composition are preheated to approx. 1250 ° C and then hot-rolled in 5 to 9 stitches with small single stitch decreases in a roughing mill, the stitch decreases <20% for the first two and <30% for the following stitches. When entering the finishing line, the material has a temperature between 930 ° C and 1100 ° C, preferably <1000 ° C when using unalloyed steel and preferably between 1000 ° C and 1100 ° C when using Si-alloyed steel. According to the process, the final rolling temperature is between 800 ° C and 950 ° C, preferably between 840 ° C and 870 ° C for unalloyed material and preferably up to 920 ° C for alloyed materials, the stitch decreases during finish rolling not exceeding 35%. The finished strip produced in this way is then coiled at a reel temperature of> 700 ° C without forced cooling. Depending on the desired cold strip thickness in the range from 0.1 to 0.6 mm, the hot strip thickness should be selected so that degrees of deformation of> 86%, preferably> 90%, can be achieved in the subsequent cold forming. Thinner slabs, in particular those produced using the thin slab casting technology, are hot-rolled analogously, with the result of the lower deformation rates, the stitch decreases can be about 10% higher. It was found that with a hot strip produced in this way, the desired microstructure formation can be made considerably more economical by the subsequent cold forming. According to the process, it is advantageous if the cold forming which takes place after the usual pickling in several passes begins at elevated temperatures in the range from 150 ° C. to 350 ° C., preferably between 200 ° C. and 300 ° C. The strip, cold-formed with a degree of deformation> 86%, is then annealed for 0.5 to 20 h at 500 ° C. to 750 ° C. under neutral gas, preferably 1 to 5 h around 550 ° C. for unalloyed and at 620 ° C. to 680 ° C. for silicon alloy material. After this intermediate annealing, the material is subjected to a further cold working of 2 to 15%, preferably 6 to 12% (tempered) and then finally annealed at temperatures around 800 ° C., depending on the composition, at or slightly above
Das erfindungsgemäße Verfahren soll nachfolgend an drei Ausführungsbeispielen näher erläutert werden.The method according to the invention is to be explained in more detail below using three exemplary embodiments.
Eine unlegierte Stahlbramme mit einem C-Gehalt von 0,07 % und einer Dicke von 250 mm wird auf 1250 °C vorgewärmt und in 7 Stichen auf 32 mm vorgewalzt. Das Fertigwalzen erfolgt in 5 Stichen bei einer Einlauftemperatur von 965 °C und einer Endwalztemperatur von 840 °C, bei Einzelstichabnahme < 30 % auf 5,6 mm mit anschließender Luftabkühlung. Das gebeizte Band wird nach dem Kaltwalzen auf 0,55 mm (Verformungsgrad 90 %) bei 560 °C für 2 Stunden zwischengeglüht und anschließend mit 6 % dressiert. Nachfolgend wird dieses Material einer Schlußglühung bei 780 °C, eine Stunde in feuchtem und vier Stunden im trockenem H₂ unterzogen. Das danach hergestellte kornorientierte Elektroband weist für Ĵ 2500 (T) folgende Werte auf:An unalloyed steel slab with a C content of 0.07% and a thickness of 250 mm is preheated to 1250 ° C and rolled in 7 passes to 32 mm. Finishing rolling is done in 5 passes at an inlet temperature of 965 ° C and a finish rolling temperature of 840 ° C, with a single pass decrease of <30% to 5.6 mm with subsequent air cooling. After pickling, the pickled strip is annealed to 0.55 mm (degree of deformation 90%) at 560 ° C for 2 hours and then treated with 6%. This material is then subjected to a final annealing at 780 ° C, one hour in moist and four hours in dry H₂. The grain-oriented electrical steel produced afterwards has the following values for Ĵ 2500 (T):
Winkelabhängigkeit der magnetischen Polarisation bei Ĥ = 2500 Am-1 (φ = Winkel zur Walzrichtung)
Der Mittelwert 
The mean
Eine Si-legierte Stahlbramme mit einem Si-Gehalt von 1,1 % und einem C-Gehalt von 0,05 % sowie einer Dicke von 250 mm wird auf eine Temperatur von 1250 °C vorgewärmt und in der gleichen Weise bezüglich Stichanzahl und Verformungsgrad warm- und kaltgewalzt wie in Beispiel A, jedoch unter Änderung folgender Parameter:
Die Winkelabhängigkeit der magnetischen Polarisation ergibt dich zu
mit einem Mittelwert 
with an average
Eine unlegierte Stahlbramme wie nach Beispiel A wird jedoch mit einer etwas höheren Temperatur warmgewalzt, anschließend kaltgewalzt und zwischengeglüht, wobei sich dem 1. Dressieren (10%) eine weitere Zwischenglühung bei 780 °C/2 h in trockenem H₂ anschließt und danach das Band einer weiteren 10 %-igen Kaltverformung unterzogen wird. Die Schlußglühung erfolgt bei 780 °C/1 h in feuchtem und 4 h in trockenem H₂. Das danach hergestellte kornorientierte Elektroband weist für J 2500 (T) folgende Werte auf:
Die Mittelwerte 
Das erfindungsgemäß hergestellte kornorientierte Elektroband eignet sich besonders für Einsatzfälle, bei denen der Magnetfluß in zwei zueinander senkrechten Richtungen geführt wird. Dazu werden in nicht umlaufenden elektrischen Maschinen, die für den Aufbau der Magnetkörper erforderlichen Stanzteile entsprechend der in Figur 1 dargestellten Anordnung der Schnittformen aus dem Bandmaterial gefertigt, wobei die Strahlen 1, 2, 3, 4 die vier Richtungen leichter Magnetisierbarkeit kennzeichnen. Die Magnetkerne für umlaufende Elektromaschinen werden so gefertigt, daß entweder jeweils unmittelbar aufeinander folgende Kernbleche zueinander um 45 ° gedreht angeordnet sind oder daß entsprechend Figur 2 der Magnetkern aus Segmenten aufgebaut ist, wobei die Segmente die Winkel leichter Magnetisierbarkeit erfassen. Bei der erstgenannten alternierenden Schichtung der Ronden wurde für die Winkelabhängigkeit der J 2500-Werte für Ronden nach Beispiel C folgende Ergebnisse gefunden:
Als Mittelwerte J 2500 über alle Richtungen erhält man für
Die danach hergestellten Magnetkerne zeichnen sich durch bessere magnetische Eigenschaften aus.The magnetic cores produced afterwards are characterized by better magnetic properties.
Claims (10)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4337605 | 1993-11-01 | ||
| DE4337605A DE4337605C2 (en) | 1993-11-01 | 1993-11-01 | Method for producing grain-oriented electrical steel and magnetic cores made therefrom |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0651061A1 true EP0651061A1 (en) | 1995-05-03 |
| EP0651061B1 EP0651061B1 (en) | 1999-12-22 |
Family
ID=6501755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94116869A Expired - Lifetime EP0651061B1 (en) | 1993-11-01 | 1994-10-26 | Process for producing grain-oriented electrical steel sheet and magnetic cores produced therefrom |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0651061B1 (en) |
| AT (1) | ATE187984T1 (en) |
| DE (2) | DE4337605C2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999042626A1 (en) * | 1998-02-20 | 1999-08-26 | Thyssen Krupp Stahl Ag | Method for producing non-grain oriented electro sheet steel |
| US7501028B2 (en) | 2002-05-15 | 2009-03-10 | Thyssenkrupp Stahl Ag | Non-grain oriented magnetic steel strip or magnetic steel sheet and method for its production |
| CN101431279B (en) * | 2007-11-07 | 2012-08-15 | 通用汽车环球科技运作公司 | Rotating electric machine stator core and method of making |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006017762B4 (en) | 2006-04-12 | 2010-07-08 | Siemens Ag | Process for laminating an electrical steel strip for transformer cores |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1212124B (en) * | 1959-12-24 | 1966-03-10 | Vacuumschmelze Ag | Process for the production of sheet metal from iron-silicon alloys |
| DE1256239B (en) * | 1961-01-27 | 1967-12-14 | Westinghouse Electric Corp | Process for the production of cube texture in iron-silicon sheets |
| US4427462A (en) * | 1981-06-18 | 1984-01-24 | Matsushita Electric Industrial Co., Ltd. | Electric apparatus and its magnetic core of (100)[011] silicon-iron sheet made by rapid quenching method |
| EP0431502A2 (en) * | 1989-12-06 | 1991-06-12 | Ebg Gesellschaft Für Elektromagnetische Werkstoffe Mbh | Non-oriented electrical strip and method of manufacturing |
| EP0434641A2 (en) * | 1989-12-22 | 1991-06-26 | CENTRO SVILUPPO MATERIALI S.p.A. | Process for the production of semiprocessed non oriented grain electrical steel |
| EP0609190A1 (en) * | 1993-01-29 | 1994-08-03 | CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif | Method of manufacturing a hot rolled steel sheet with high magnetic properties |
-
1993
- 1993-11-01 DE DE4337605A patent/DE4337605C2/en not_active Expired - Fee Related
-
1994
- 1994-10-26 AT AT94116869T patent/ATE187984T1/en active
- 1994-10-26 DE DE59409021T patent/DE59409021D1/en not_active Expired - Lifetime
- 1994-10-26 EP EP94116869A patent/EP0651061B1/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1212124B (en) * | 1959-12-24 | 1966-03-10 | Vacuumschmelze Ag | Process for the production of sheet metal from iron-silicon alloys |
| DE1256239B (en) * | 1961-01-27 | 1967-12-14 | Westinghouse Electric Corp | Process for the production of cube texture in iron-silicon sheets |
| US4427462A (en) * | 1981-06-18 | 1984-01-24 | Matsushita Electric Industrial Co., Ltd. | Electric apparatus and its magnetic core of (100)[011] silicon-iron sheet made by rapid quenching method |
| EP0431502A2 (en) * | 1989-12-06 | 1991-06-12 | Ebg Gesellschaft Für Elektromagnetische Werkstoffe Mbh | Non-oriented electrical strip and method of manufacturing |
| EP0434641A2 (en) * | 1989-12-22 | 1991-06-26 | CENTRO SVILUPPO MATERIALI S.p.A. | Process for the production of semiprocessed non oriented grain electrical steel |
| EP0609190A1 (en) * | 1993-01-29 | 1994-08-03 | CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif | Method of manufacturing a hot rolled steel sheet with high magnetic properties |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999042626A1 (en) * | 1998-02-20 | 1999-08-26 | Thyssen Krupp Stahl Ag | Method for producing non-grain oriented electro sheet steel |
| US6503339B1 (en) | 1998-02-20 | 2003-01-07 | Thyssen Krupp Stahl Ag | Method for producing non-grain oriented magnetic sheet steel |
| US7501028B2 (en) | 2002-05-15 | 2009-03-10 | Thyssenkrupp Stahl Ag | Non-grain oriented magnetic steel strip or magnetic steel sheet and method for its production |
| CN101431279B (en) * | 2007-11-07 | 2012-08-15 | 通用汽车环球科技运作公司 | Rotating electric machine stator core and method of making |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4337605A1 (en) | 1995-05-04 |
| DE59409021D1 (en) | 2000-01-27 |
| EP0651061B1 (en) | 1999-12-22 |
| ATE187984T1 (en) | 2000-01-15 |
| DE4337605C2 (en) | 1996-02-08 |
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