EP0431502B1 - Non-oriented electrical strip and method of manufacturing - Google Patents
Non-oriented electrical strip and method of manufacturing Download PDFInfo
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- EP0431502B1 EP0431502B1 EP90123040A EP90123040A EP0431502B1 EP 0431502 B1 EP0431502 B1 EP 0431502B1 EP 90123040 A EP90123040 A EP 90123040A EP 90123040 A EP90123040 A EP 90123040A EP 0431502 B1 EP0431502 B1 EP 0431502B1
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- strip
- magnetic strip
- annealed
- rolled
- magnetic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C21D8/1216—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
- 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
-
- 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
Definitions
- non-grain-oriented electrical steel with cube texture (100) [001] or with cube surface texture (100) [0vw] and a final thickness of about 0.35 to 0.65 mm and a method for its production.
- non-grain-oriented electrical steel is understood here, regardless of its crystallographic texture, to be one according to DIN 46 400 Part 1 or 4, the loss anisotropy of which does not exceed the maximum values specified in DIN 46 400 Part 1.
- J 2500 in the following denotes the magnetic polarization at a magnetic field strength of 2500 A / m and "P 1.5" the magnetic loss at a polarization of 1.5 T and a frequency of 50 Hz.
- the electrical steel or electrical sheet according to the invention is largely isotropic in its plane and has good properties in all directions, e.g. B. J 2500> 1.66 T and P 1.5 ⁇ 3.3 W / kg, and is therefore particularly suitable for electromagnetic circuits that are magnetized in all directions, for. B. for electric motors and generators.
- a recovery annealing is interposed in order to achieve a large reduction in thickness by cold rolling in order to reduce residual stresses without the magnetic properties of the finished strip being changed thereby.
- a hot strip with a thickness of 1.52 to 4.06 mm is cold rolled to an intermediate thickness of 0.51 to 1.01 mm and then cold rolled to 0.152 to 0.457 mm.
- a non-grain-oriented electrical steel with high proportions of cube or cube surface texture and with a polarization> 1.7 T at a magnetic field strength of 2500 A / m and low magnetic loss, which consists of a steel that ⁇ 0.025% C, ⁇ 0.10% Mn, 0.1 to 4.4% Si and 0.1 to 4.4% Al with the proviso that the following relationships are fulfilled: (% Si) + 2 (% Al)> 1.6% and (% Si) + (% Al) ⁇ 4.5%, optionally with a total of 0.005 to 0.15% of Sn and / or Sb as surface-active elements, Rest iron, including inevitable impurities.
- the Si content is preferably in the range from 0.5 to 4.0%, in particular in the range from 0.5 to 2.0%. While with the choice of the steel composition provided according to the invention with (% Si) + 2 (% Al)> 1.6% a substantial ⁇ - ⁇ conversion freedom of the steel is determined, it is advantageous that the steel slab Si and Al in one contains such an amount that the relationship (% Si) + 2 (% Al)> 2% is satisfied.
- the aluminum content is preferably in the range from 0.3 to 2.0%.
- a hot-rolled strip produces a layer structure with a recrystallized structure in areas near the surface with predominantly orientations (110) [001] and (11 2nd ) [111] and inside the band a polygonized structure with elongated larger grains, predominantly the stable orientation (100) [011] and (11 1 ) [112].
- the carbon content should expediently be limited to a maximum of 0.015% and should preferably be between 0.001 and 0.015%.
- This low starting carbon content is advantageous, inter alia, with regard to the duration of the decarburization annealing in order to achieve an aging-free electrical steel strip or sheet a C content of less than 0.002%.
- surface-active elements such as, for example, antimony and / or tin, leads to a considerable delay in the decarburization reaction.
- the limitation of the carbon content to a maximum of 0.015%, in particular in connection with the setting of the Si and Al content in accordance with (% Si) + 2 (% Al)> 2% ensures complete freedom from transformation of the steel, which with regard to the desired properties of the electrical steel or sheet is particularly advantageous.
- the freedom from transformation of the steel is important for the final annealing, since the set texture is lost when the alpha-gamma phase boundary is exceeded, and for the hot forming, since the ferritic single-phase area is necessary for the targeted formation of cubic texture components during hot rolling.
- surface-active elements such as antimony and / or tin
- a total amount of 0.005 to 0.15%, preferably 0.02 to 0.06% leads to the suppression of the growth of grains with unfavorable (111) Texture components. This is particularly advantageous for long-term annealing in the hood furnace or in the stamping furnace when processing electrical steel that has not been finally annealed.
- phase transformation largely does not occur as a result of the steel composition according to the invention, which is important because the texture generated would be lost if the alpha-gamma phase boundary were exceeded, and this is also important for hot forming because of targeted training cubic texture components during hot rolling the ferritic single phase area is necessary.
- the cold forming provided according to the invention with a total degree of deformation of at least 86% also significantly contributes to the formation of cubic texture components. Avoiding recrystallizing intermediate annealing.
- the deformation is a maximum of 30% per pass if the slab temperature is in the range between 1000 and 1060 ° C.
- the finish rolling temperature should preferably be between 900 and 960 ° C. This favors the above-mentioned layer structure.
- a first section of the cold forming is to be carried out up to a strip thickness of 1.3 to 1.9 mm at an elevated temperature of 180 to 300 ° C.
- a blocking or anchoring of sliding dislocations and thus the activation of other sliding systems or a inhomogeneous deformation (shear bands) can be achieved, which contributes in particular to an increase in the magnetic polarization in the transverse direction.
- a better isotropy of the magnetic properties in the strip plane in the case of electrical steel with a cube-surface texture can be achieved in a further embodiment of the process according to the invention in that the cold-rolled strip is non-recrystallizing at a strip thickness which is still 1.12 to 1.2 times the final thickness Recuperation annealing, in particular between 400 and 500 ° C for 1 to 10 h, subjected and then cold rolled and annealed.
- the sheet produced in this way is particularly suitable for rotating machines.
- the strip which has been rolled to its final thickness, is preheated in a continuous furnace, possibly decarburizing in this furnace, and then final-annealed in the same furnace at temperatures between 900 and 1100 ° C.
- the final annealing temperature should not be below 900 ° C, because then the grain size of the material is not large enough to achieve a low loss of magnetization.
- the cold-rolled strip is in a hood furnace under a hydrogen atmosphere between 600 to 900 ° C or in a continuous furnace between 750 to 900 ° C for less than 5 min. annealed recrystallizing. in the In the case of bell annealing, the strip must then be straightened or re-rolled with a degree of deformation of less than 7%. Stamped parts are then produced from the non-final-annealed strips thus produced and a stamped part annealing, e.g. B. according to DIN 46 400 Part 4. To achieve particularly good magnetic properties, however, the duration and temperature of the stamped part annealing should be reduced to e.g. B. 15 h and 950 ° C for steel compositions with surfactants.
- Bands B, C and D are comparative examples not belonging to the invention.
- the Si and Al portions of bands B and C do not satisfy the relationship (% Si) + 2 (% Al)> 1.6.
- Bands C and D have too high a Mn content.
- the strips were then decarburized and annealed for 1 minute at 1050 ° C (hot strip E, Table 3) or 1 h at 950 ° C (hot strip A, Table 4).
- variant b brings about a slight improvement in the polarization, which becomes even clearer after long-term annealing (Table 4).
- the almost equally large values in the longitudinal direction (0 °) and transverse direction (90 °) indicate a particularly high proportion of grains with cube orientation.
- a pronounced isotropy of the polarization in the sheet metal plane can be achieved by variant c.
- Table 5 shows the influence of the different annealing variants on the magnetic result.
- a melt was processed into hot strip (composition in Table 6).
- the final rolling temperature of variant a is in the preferred range of 900 to 960 ° C and thus leads to a considerably higher polarization.
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
- Metal Rolling (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
Die Erfindung bezieht sich auf nichtkornorientiertes Elektroband mit Würfeltextur (100) [001] oder mit Würfelflächentextur (100) [0vw] und einer Enddicke von etwa 0,35 bis 0,65 mm und ein Verfahren zu seiner Herstellung. Unter dem Begriff "nichtkornorientiertes Elektroband" wird hier unabhängig von seiner kristallographischen Textur ein solches nach DIN 46 400 Teil 1 oder 4 verstanden, dessen Verlustanisotropie die in DIN 46 400 Teil 1 festgelegten Höchstwerte nicht überschreitet.The invention relates to non-grain-oriented electrical steel with cube texture (100) [001] or with cube surface texture (100) [0vw] and a final thickness of about 0.35 to 0.65 mm and a method for its production. The term "non-grain-oriented electrical steel" is understood here, regardless of its crystallographic texture, to be one according to DIN 46 400 Part 1 or 4, the loss anisotropy of which does not exceed the maximum values specified in DIN 46 400 Part 1.
Die Begriffe "Elektroband" und "Elektroblech" werden hier als Synonyme verstanden. Alle %-Angaben sind, sofern nichts anderes angegeben ist, Massenteile in %.The terms "electrical steel" and "electrical sheet" are understood here as synonyms. Unless otherwise stated, all percentages are by mass in%.
"J 2500" bezeichnet im folgenden die magnetische Polarisation bei einer magnetischen Feldstärke von 2500 A/m und "P 1,5" den Ummagnetisierungsverlust bei einer Polarisation von 1,5 T und einer Frequenz von 50 Hz."J 2500" in the following denotes the magnetic polarization at a magnetic field strength of 2500 A / m and "P 1.5" the magnetic loss at a polarization of 1.5 T and a frequency of 50 Hz.
Das erfindungsgemäße Elektroband weist im Falle der Würfeltextur ausgezeichnete magnetische Eigenschaften in Längs- und Querrichtung auf, z. B. J 2500 > 1,7 T und P 1,5 < 3,3 W/kg für einen Stahl mit einem mittleren Legierungsgehalt von (%Si) + (%Al) = 1,8 %, und ist deshalb insbesondere für elektromagnetische Kreise geeignet, die hauptsächlich in zwei senkrecht aufeinanderstehenden Richtungen magnetisiert werden, z. B. für Kleintransformatoren, Vorschaltgeräte und Statorbleche von Großgeneratoren.The electrical steel according to the invention has excellent magnetic properties in the longitudinal and transverse directions in the case of cube texture, e.g. B. J 2500> 1.7 T and P 1.5 <3.3 W / kg for a steel with an average alloy content of (% Si) + (% Al) = 1.8%, and is therefore particularly suitable for electromagnetic Suitable circles that are magnetized mainly in two perpendicular directions, z. B. for small transformers, ballasts and stator plates of large generators.
Im Falle der Würfelflächentextur ist das erfindungsgemäße Elektroband bzw. Elektroblech in seiner Ebene weitgehend isotrop und weist in allen Richtungen gute Eigenschaften auf, z. B. J 2500 > 1,66 T und P 1,5 < 3,3 W/kg, und ist deshalb insbesondere für elektromagnetische Kreise geeignet, die in allen Richtungen magnetisiert werden, z. B. für Elektromotoren und Generatoren.In the case of the cube surface texture, the electrical steel or electrical sheet according to the invention is largely isotropic in its plane and has good properties in all directions, e.g. B. J 2500> 1.66 T and P 1.5 <3.3 W / kg, and is therefore particularly suitable for electromagnetic circuits that are magnetized in all directions, for. B. for electric motors and generators.
Bekannt sind Verfahren zur Herstellung von Elektroblechen mit kubischen Texturen mit (100)-Flächen in der Blechebene, die eine hohe magnetische Polarisation aufweisen, Deren kommerzielle Herstellung hat sich jedoch aufgrund der Herstellungsschwierigkeiten und der hohen Kosten bis heute nicht durchgesetzt.Methods are known for the production of electrical sheets with cubic textures with (100) faces in the sheet plane, which have a high magnetic polarization. However, their commercial production has not been successful to date because of the manufacturing difficulties and the high costs.
Die Herstellung von Elektroblech mit Würfeltextur als weichmagnetischer Werkstoff wurde hauptsächlich zwischen 1950 und 1970 als Kernwerkstoff für Elektromotoren und Transformatoren untersucht.The production of electrical sheet with cube texture as a soft magnetic material was mainly investigated between 1950 and 1970 as the core material for electric motors and transformers.
Bei dem aus der DE-C-1 923 581 bekannten Verfahren wird als Ausgangsmaterial eine Bramme mit den üblichen Silicium- und/oder Aluminiumgehalten, jedoch niedrigen C-Gehalten (< 0,005 %, vorzugsweise < 0,003 %), auf eine Dicke von 10 mm warmgewalzt und unter zweimaligem Zwischenglühen in drei Stufen auf 0,35 mm kaltgewalzt. Dieses Verfahren ist wegen der Zwischenglühungen aufwendig. Gemäß der DE-A-1 966 686 wird eine Bramme mit zusätzlich eingeschränktem S-Gehalt (0,005 %, vorzugsweise 0,003 %) auf 5 mm warmgewalzt, auf ca. 1 mm kaltgewalzt, zwischen 900 und 1050 °C in trockenem H₂ zwischengeglüht, auf 0,35 mm kaltgewalzt und schließlich zwischen 1000 und 1100 °C in nichtoxidierender Atmosphäre schlußgeglüht. Nach diesem Verfahren konnten kommerziell keine Elektrobänder hergestellt werden, welche die typischen Eigenschaften einer Elektroblechsorte nach DIN 46 400 Teil 1 übertreffen, die den gleichen Legierungsgehalt und die gleiche Dicke aufweist.In the process known from DE-C-1 923 581, a slab with the usual silicon and / or aluminum contents, but low C contents (<0.005%, preferably <0.003%), is used as the starting material to a thickness of 10 mm hot-rolled and cold-rolled in three stages to 0.35 mm with two intermediate anneals. This process is complex because of the intermediate annealing. According to DE-A-1 966 686, a slab with an additional limited S content (0.005%, preferably 0.003%) is hot-rolled to 5 mm, cold-rolled to approx. 1 mm, and annealed between 900 and 1050 ° C in dry H₂ 0.35 mm cold rolled and finally annealed between 1000 and 1100 ° C in a non-oxidizing atmosphere. Using this process, it was not possible to produce any electrical steel strips that exceed the typical properties of a type of electrical steel according to DIN 46 400 Part 1, which has the same alloy content and the same thickness.
Nach einem weiteren aus der DE-A-3 028 147 bekannten Verfahren zum Kaltwalzen eine Si-Stahlbandes wird zur Erzielung einer großen Dickenverminderung durch Kaltwalzen ein Erholungsglühen zwischengeschaltet, um Restspannungen abzubauen, ohne daß die magnetischen Eigenschaften des Fertigbandes hierdurch verändert werden. Hierbei wird ein Warmband mit einer Dicke von 1,52 bis 4,06 mm auf eine Zwischendicke von 0,51 bis 1,01 mm kaltgewalzt und anschließend auf 0,152 bis 0,457 mm kalt fertiggewalzt.According to a further method for cold rolling an Si steel strip known from DE-A-3 028 147, a recovery annealing is interposed in order to achieve a large reduction in thickness by cold rolling in order to reduce residual stresses without the magnetic properties of the finished strip being changed thereby. Here, a hot strip with a thickness of 1.52 to 4.06 mm is cold rolled to an intermediate thickness of 0.51 to 1.01 mm and then cold rolled to 0.152 to 0.457 mm.
Offenbar ist ein hoher Gesamtumformgrad beim Kaltwalzen bis zu 90 % ohne eine Erholungsglühung zwischen den Kaltwalzschritten nicht erzielbar. Dieses Verfahren bezieht sich nicht auf spezielle Legierungen, wird aber was an den Beispielen deutlich wird, für kornorientierte Elektrobleche (Goss-Textur) propagiert. Es gibt keinerlei Hinweis darauf, daß auch in der Querrichtung gute magnetische Eigenschaften erzielbar sind.Apparently, a high overall degree of forming during cold rolling of up to 90% cannot be achieved without a recovery anneal between the cold rolling steps. This method does not refer to special alloys, but is propagated for grain-oriented electrical sheets (Goss texture), as is clear from the examples. There is no indication that good magnetic properties can also be achieved in the transverse direction.
Der Erfindung liegt die Aufgabe zugrunde, ein nichtkornorientiertes Elektroband mit folgenden Eigenschaften zu schaffen:
- hohe magnetische Polarisationswerte von J 2500 > 1,7 T durch Ausbildung geeigneter Texturkomponenten und gleichzeitig
- einen niedrigen Ummagnetisierungsverlust von z. B. P 1,5 < 3,3 W/kg für einen Stahl mit einem mittleren Legierungsgehalt von (% Si) + (% Al) = 1,8 %.
- high magnetic polarization values of J 2500> 1.7 T due to the formation of suitable texture components and at the same time
- a low magnetic loss of z. B. P 1.5 <3.3 W / kg for a steel with an average alloy content of (% Si) + (% Al) = 1.8%.
Diese Aufgabe wird erfindungsgemäß durch ein nichtkornorientiertes Elektroband mit hohen Anteilen an Würfel- oder Würfelflächentextur und mit einer Polarisation > 1,7 T bei einer magnetischen Feldstärke von 2500 A/m und niedrigem Ummagnetisierungsverlust gelöst, das aus einem Stahl besteht, der
≦ 0,025 % C,
< 0,10 % Mn,
0,1 bis 4,4 % Si und
0,1 bis 4,4 % Al mit der Maßgabe, daß folgende Beziehungen erfüllt sind:
(% Si) + 2 (% Al) > 1,6 % und
(% Si) + (% Al) < 4,5 %,
gegebenenfalls mit insgesamt 0,005 bis 0,15 % Sn und/oder Sb als grenzflächenaktiven Elementen,
Rest Eisen,
einschließlich unvermeidbarer Verunreinigungen enthält.This object is achieved according to the invention by a non-grain-oriented electrical steel with high proportions of cube or cube surface texture and with a polarization> 1.7 T at a magnetic field strength of 2500 A / m and low magnetic loss, which consists of a steel that
≦ 0.025% C,
<0.10% Mn,
0.1 to 4.4% Si and
0.1 to 4.4% Al with the proviso that the following relationships are fulfilled:
(% Si) + 2 (% Al)> 1.6% and
(% Si) + (% Al) <4.5%,
optionally with a total of 0.005 to 0.15% of Sn and / or Sb as surface-active elements,
Rest iron,
including inevitable impurities.
Bevorzugt liegt der Si-Gehalt im Bereich von 0,5 bis 4,0 %, insbesondere im Bereich von 0,5 bis 2,0 %. Während mit der Wahl der nach der Erfindung vorgesehenen Stahlzusammensetzung mit (%Si) + 2(%Al) > 1,6 % eine weitgehende α-γ-Umwandlungsfreiheit des Stahles festgelegt wird, ist es vorteilhaft, daß die Stahlbramme Si und Al in einer solchen Menge enthält, daß die Beziehung (%Si) + 2(%Al) > 2 % erfüllt wird. Dabei liegt der Aluminiumgehalt bevorzugt im Bereich von 0,3 bis 2,0 %.The Si content is preferably in the range from 0.5 to 4.0%, in particular in the range from 0.5 to 2.0%. While with the choice of the steel composition provided according to the invention with (% Si) + 2 (% Al)> 1.6% a substantial α-γ conversion freedom of the steel is determined, it is advantageous that the steel slab Si and Al in one contains such an amount that the relationship (% Si) + 2 (% Al)> 2% is satisfied. The aluminum content is preferably in the range from 0.3 to 2.0%.
Überraschend hat sich gezeigt, daß niedrige Mangangehalte < 0,1 %, bevorzugt weniger als 0,08 % Mn, zur Einstellung der (100)-Texturkomponenten notwendig sind. Im Warmband entsteht bei Einhalten der erfindungsgemäßen Zusammensetzung eine Schichtstruktur mit rekristallisiertem Gefüge in oberflächennahen Bereichen mit Orientierungen vorwiegend (110) [001] und (11
Der Kohlenstoffgehalt sollte zweckmäßigerweise auf maximal 0,015 % begrenzt sein und bevorzugt zwischen 0,001 und 0,015 % liegen. Dieser niedrige Ausgangskohlenstoffgehalt ist unter anderem von Vorteil hinsichtlich der Zeitdauer der Entkohlungsglühung zur Erzielung eines alterungsfreien Elektrobandes bzw. -bleches mit einem C-Gehalt von weniger als 0,002 %. Die zusätzliche vorteilhafte Zugabe von grenzflächenaktiven Elementen, wie z.B. Antimon und/oder Zinn, führt nämlich zu einer erheblichen Verzögerung der Entkohlungsreaktion.The carbon content should expediently be limited to a maximum of 0.015% and should preferably be between 0.001 and 0.015%. This low starting carbon content is advantageous, inter alia, with regard to the duration of the decarburization annealing in order to achieve an aging-free electrical steel strip or sheet a C content of less than 0.002%. The additional advantageous addition of surface-active elements, such as, for example, antimony and / or tin, leads to a considerable delay in the decarburization reaction.
Ferner wird durch die Begrenzung des Kohlenstoffgehaltes auf maximal 0,015 %, insbesondere in Verbindung mit der Einstellung des Si- und Al-Gehaltes gemäß (%Si) + 2 (%Al) > 2 %, eine vollständige Umwandlungsfreiheit des Stahles sichergestellt, welche bezüglich der angestrebten Eigenschaften des Elektrobandes bzw. -bleches besonders vorteilhaft ist. Die Umwandlungsfreiheit des Stahls ist von Bedeutung für die Schlußglühung, da beim Überschreiten der Alpha-Gamma-Phasengrenze die eingestellte Textur verlorengeht, und für die Warmumformung, da zur gezielten Ausbildung kubischer Texturkomponenten während des Warmwalzens das ferritische Einphasengebiet notwendig ist.Furthermore, the limitation of the carbon content to a maximum of 0.015%, in particular in connection with the setting of the Si and Al content in accordance with (% Si) + 2 (% Al)> 2%, ensures complete freedom from transformation of the steel, which with regard to the desired properties of the electrical steel or sheet is particularly advantageous. The freedom from transformation of the steel is important for the final annealing, since the set texture is lost when the alpha-gamma phase boundary is exceeded, and for the hot forming, since the ferritic single-phase area is necessary for the targeted formation of cubic texture components during hot rolling.
Die Zugabe von grenzflächenaktiven Elementen,wie Antimon und/oder Zinn, in Mengen von insgesamt 0,005 bis 0,15 %, bevorzugt 0,02 bis 0,06 %, führt bei der Schlußglühung zur Unterdrückung des Wachstums von Körnern mit ungünstigen (111)-Texturkomponenten. Dies ist insbesondere vorteilhaft bei Langzeitglühungen im Haubenofen oder im Stanzteilofen bei der Verarbeitung von nicht schlußgeglühtem Elektroband.The addition of surface-active elements, such as antimony and / or tin, in a total amount of 0.005 to 0.15%, preferably 0.02 to 0.06%, leads to the suppression of the growth of grains with unfavorable (111) Texture components. This is particularly advantageous for long-term annealing in the hood furnace or in the stamping furnace when processing electrical steel that has not been finally annealed.
Das erfindungsgemäße Verfahren zur Herstellung eines nichtkornorientierten Elektrobandes mit hohen Anteilen an Würfel- oder Würfelflächentextur und mit einer Polarisation > 1,7 T bei einer magnetischen Feldstärke von 2500 A/m und niedrigem Ummagnetisierungsverlust, bestehend aus einem Stahl mit
≦ 0,025 % C,
< 0,10 % Mn,
0,1 bis 4,4 % Si,
0,1 bis 4,4 % Al mit der Maßgabe, daß folgende Beziehungen erfüllt sind:
(% Si) + 2 (% Al) > 1,6 % und
(% Si) + (% Al) < 4,5 %,
gegebenenfalls mit insgesamt 0,005 bis 0,15 % Sn und/oder Sb als grenzflächenaktiven Elementen,
Rest Eisen, einschließlich unvermeidbarer Verunreinigungen
ist dadurch gekennzeichnet, daß die Stahlbramme auf eine Dicke von nicht unter 3,5 mm warmgewalzt wird, worauf das so erhaltene Warmband ohne rekristallisierendes Zwischenglühen mit einem Verformungsgrad von mindestens 86 % kaltgewalzt und das Kaltband geglüht wird.The process according to the invention for producing a non-grain-oriented electrical steel strip with high proportions of cube or cube surface texture and with a polarization> 1.7 T at a magnetic field strength of 2500 A / m and low magnetic loss, consisting of a steel with
≦ 0.025% C,
<0.10% Mn,
0.1 to 4.4% Si,
0.1 to 4.4% Al with the proviso that the following relationships are fulfilled:
(% Si) + 2 (% Al)> 1.6% and
(% Si) + (% Al) <4.5%,
optionally with a total of 0.005 to 0.15% of Sn and / or Sb as surface-active elements,
Balance iron, including inevitable impurities
is characterized in that the steel slab is hot rolled to a thickness of not less than 3.5 mm, whereupon the hot strip thus obtained is cold rolled without recrystallizing intermediate annealing with a degree of deformation of at least 86% and the cold strip is annealed.
Wie bereits dargelegt, tritt infolge der erfindungsgemäßen Stahlzussmmensetzung eine Phasenumwandlung weitgehend nicht auf, was einmal von Bedeutung ist, weil beim Überschreiten der Alpha-Gamma-Phasengrenze die erzeugte Textur verlorengehen würde, zum anderen hat das für die Warmumformung ebenfalls Bedeutung, weil zur gezielten Ausbildung kubischer Texturkomponenten während des Warmwalzens das ferritische Einphasengebiet notwendig ist. Zur Ausbildung kubischer Texturkomponenten trägt im Rahmen der Primärrekristallisation und des normalen Kornwachstums auch wesentlich die erfindungsgemäß vorgesehene Kaltumformung mit einem Gesamtumformgrad von mindestens 86 % unter. Vermeidung von rekristallisierendem Zwischenglühen bei.As already explained, phase transformation largely does not occur as a result of the steel composition according to the invention, which is important because the texture generated would be lost if the alpha-gamma phase boundary were exceeded, and this is also important for hot forming because of targeted training cubic texture components during hot rolling the ferritic single phase area is necessary. In the course of primary recrystallization and normal grain growth, the cold forming provided according to the invention with a total degree of deformation of at least 86% also significantly contributes to the formation of cubic texture components. Avoiding recrystallizing intermediate annealing.
Nach einer bevorzugten Ausgestaltung des Verfahrens ist es zweckmäßig, daß beim Warmwalzen in der Fertigstraße die Verformung maximal 30 % pro Stich beträgt, wenn die Brammentemperatur im Bereich zwischen 1000 und 1060 °C liegt. Die Endwalztemperatur sollte bevorzugt zwischen 900 und 960 °C liegen. Dadurch wird die vorerwähnte Schichtstruktur begünstigt.According to a preferred embodiment of the method, it is expedient that during hot rolling in the finishing train the deformation is a maximum of 30% per pass if the slab temperature is in the range between 1000 and 1060 ° C. The finish rolling temperature should preferably be between 900 and 960 ° C. This favors the above-mentioned layer structure.
Nach einer weiteren vorteilhaften Ausgestaltung des Verfahrens soll ein erster Abschnitt der Kaltumformung bis zu einer Banddicke von 1,3 bis 1,9 mm bei erhöhter Temperatur von 180 bis 300 °C durchgeführt werden. Auf diese Weise kann zusammen mit dem erfindungsgemäß festgelegten Kohlenstoffgehalt von < 0,025 %, insbesondere < 0,015 % , und der in diesem Temperaturbereich auftretenden dynamischen Verformungsalterung infolge der Kohlenstoff-Versetzungs-Wechselwirkung eine Blockierung oder Verankerung gleitfähiger Versetzungen und damit die Aktivierung anderer Gleitsysteme bzw. eine inhomogene Deformation (Scherbänder) erreicht werden, die besonders zu einer Erhöhung der magnetischen Polarisation in Querrichtung beiträgt.According to a further advantageous embodiment of the method, a first section of the cold forming is to be carried out up to a strip thickness of 1.3 to 1.9 mm at an elevated temperature of 180 to 300 ° C. In this way, together with the carbon content according to the invention of <0.025%, in particular <0.015%, and the dynamic deformation aging occurring in this temperature range due to the carbon-dislocation interaction, a blocking or anchoring of sliding dislocations and thus the activation of other sliding systems or a inhomogeneous deformation (shear bands) can be achieved, which contributes in particular to an increase in the magnetic polarization in the transverse direction.
Eine bessere Isotropie der magnetischen Eigenschaften in der Bandebene bei Elektroband mit Würfelflächentextur kann in weiterer Ausgestaltung des erfindungsgemäßen Verfahrens dadurch erfolgen, daß das kaltgewalzte Band bei einer Banddicke, die noch das 1,12- bis 1,2-fache der Enddicke beträgt, einer nichtrekristallisierenden Erholungsglühung, insbesondere zwischen 400 und 500 °C für 1 bis 10 h, unterworfen und anschließend kalt fertiggewalzt und geglüht wird. Das so hergestellte Blech ist besonders für rotierende Maschinen geeignet.A better isotropy of the magnetic properties in the strip plane in the case of electrical steel with a cube-surface texture can be achieved in a further embodiment of the process according to the invention in that the cold-rolled strip is non-recrystallizing at a strip thickness which is still 1.12 to 1.2 times the final thickness Recuperation annealing, in particular between 400 and 500 ° C for 1 to 10 h, subjected and then cold rolled and annealed. The sheet produced in this way is particularly suitable for rotating machines.
Zur Herstellung eines schlußgeglühten Bandes wird das auf die Enddicke gewalzte Band in einem Durchlaufofen, gegebenenfalls in diesem Ofen entkohlend vorgeglüht und anschließend in demselben Ofen bei Temperaturen zwischen 900 und 1100 °C schlußgeglüht. Die Schlußglühtemperatur sollte nicht unter 900 °C liegen, weil dann die Korngröße des Materials nicht genügend groß ist, um einen niedrigen Ummagnetisierungsverlust zu erzielen.To produce a final annealed strip, the strip, which has been rolled to its final thickness, is preheated in a continuous furnace, possibly decarburizing in this furnace, and then final-annealed in the same furnace at temperatures between 900 and 1100 ° C. The final annealing temperature should not be below 900 ° C, because then the grain size of the material is not large enough to achieve a low loss of magnetization.
Zur Herstellung eines nichtschlußgeglühten Bandes wird das kaltgewalzte Band in einem Haubenofen unter Wasserstoffatmosphäre zwischen 600 bis 900 °C oder in einem Durchlaufofen zwischen 750 bis 900 °C für weniger als 5 min. rekristallisierend geglüht. Im Falle der Haubenofenglühung muß das Band anschließend gerichtet oder mit einem Umformgrad von weniger als 7 % nachgewalzt werden. Aus den so hergestellten nicht schlußgeglühten Bändern werden dann in üblicher Weise Stanzteile hergestellt und einer Stanzteilglühung, z. B. nach DIN 46 400 Teil 4, unterzogen. Zur Erzielung besonders guter magnetischer Eigenschaften sollten jedoch Zeitdauer und Temperatur der Stanzteilglühung auf z. B. 15 h und 950 °C bei Stahlzusammensetzungen mit grenzflächenaktiven Elementen erhöht werden.To produce a non-final annealed strip, the cold-rolled strip is in a hood furnace under a hydrogen atmosphere between 600 to 900 ° C or in a continuous furnace between 750 to 900 ° C for less than 5 min. annealed recrystallizing. in the In the case of bell annealing, the strip must then be straightened or re-rolled with a degree of deformation of less than 7%. Stamped parts are then produced from the non-final-annealed strips thus produced and a stamped part annealing, e.g. B. according to DIN 46 400 Part 4. To achieve particularly good magnetic properties, however, the duration and temperature of the stamped part annealing should be reduced to e.g. B. 15 h and 950 ° C for steel compositions with surfactants.
Anhand der folgenden Beispiele wird die Erfindung erläutert.The invention is illustrated by the following examples.
Als Ausgangsmaterial dienten 8 Warmbänder mit unterschiedlichen Zusammensetzungen und Banddicken (Tabelle 1). Diese wurden auf die Enddicke von 0,5 mm kaltgewalzt, anschließend bei 840 °C entkohlt und 1 h bei 950 °C geglüht. Das magnetische Ergebnis ist in Tabelle 2 wiedergegeben.
Die Bänder B, C und D sind nicht zur Erfindung gehörende Vergleichsbeispiele. Die Si- und Al-Anteile der Bänder B und C genügen nicht der Beziehung (% Si) + 2 (% Al) > 1,6. Bänder C und D besitzen einen zu hohen Mn-Gehalt.Bands B, C and D are comparative examples not belonging to the invention. The Si and Al portions of bands B and C do not satisfy the relationship (% Si) + 2 (% Al)> 1.6. Bands C and D have too high a Mn content.
Die Warmbänder A und E aus Tabelle 1 wurden in drei verschiedenen Varianten abgewalzt:
- a) Kaltwalzen auf eine Banddicke von 0,5 mm;
- b) Vorwärmen des Warmbandes auf 230 °C und Kaltwalzen bei dieser Temperatur auf 1,5 mm, dann Fertigwalzen auf 0,5 mm Enddicke;
- c) wie b), jedoch mit einer Erholungsglühung 480 °C/4 h bei einer Zwischendicke von 0,58 mm.
- a) cold rolling to a strip thickness of 0.5 mm;
- b) preheating the hot strip to 230 ° C and cold rolling at this temperature to 1.5 mm, then finish rolling to 0.5 mm final thickness;
- c) as b), but with a recovery annealing 480 ° C / 4 h with an intermediate thickness of 0.58 mm.
Anschließend wurden die Bänder entkohlt und 1 Minute bei 1050 °C (Warmband E, Tabelle 3) bzw. 1 h bei 950 °C (Warmband A, Tabelle 4) geglüht.
Bei der Kurzzeitglühung (Tabelle 3) bewirkt Variante b eine geringe Verbesserung der Polarisation, die nach der Langzeitglühung (Tabelle 4) noch deutlicher erkennbar wird. Die nahezu gleich großen Werte in Längsrichtung (0°) und Querrichtung (90°) weisen auf einen besonders hohen Anteil von Körnern mit Würfelorientierung hin.In the case of short-time annealing (Table 3), variant b brings about a slight improvement in the polarization, which becomes even clearer after long-term annealing (Table 4). The almost equally large values in the longitudinal direction (0 °) and transverse direction (90 °) indicate a particularly high proportion of grains with cube orientation.
Durch Variante c läßt sich eine ausgeprägte Isotropie der Polarisation in der Blechebene erzielen.A pronounced isotropy of the polarization in the sheet metal plane can be achieved by variant c.
Die Warmbänder E und F3 aus Tabelle 1 wurden auf 230 °C vorgewärmt, bei dieser Temperatur auf 1,5 mm abgewalzt, dann auf 0,5 mm fertiggewalzt. Nach der Entkohlung bei 840 °C erfolgte eine Glühung in drei verschiedenen Varianten:
- a) 1 Minute bei 1050 °C
- b) 1 Stunde bei 950 °C
- c) 15 Stunden bei 950 °C
- a) 1 minute at 1050 ° C
- b) 1 hour at 950 ° C
- c) 15 hours at 950 ° C
Tabelle 5 zeigt den Einfluß der unterschiedlichen Glühvarianten auf das magnetische Ergebnis.
In Variante c) ergibt sich im Warmband F3 durch den Zusatz von Antimon eine deutlich höhere Polarisation als im Warmband E ohne Antimon.In variant c), the addition of antimony results in a significantly higher polarization in hot strip F3 than in hot strip E without antimony.
Eine Schmelze wurde zu Warmband verarbeitet (Zusammensetzung in Tabelle 6).
Das Fertigwalzen der Warmbänder auf 4,8 mm Banddicke erfolgte bei zwei verschiedenen Endwalztemperaturen:
- a) Endwalztemperatur: 920 °C
- b) Endwalztemperatur: 850 °C
- a) Final rolling temperature: 920 ° C
- b) Final rolling temperature: 850 ° C
Die Endwalztemperatur der Variante a liegt in dem bevorzugten Bereich von 900 bis 960 °C und führt damit zu einer erheblich höheren Polarisation.The final rolling temperature of variant a is in the preferred range of 900 to 960 ° C and thus leads to a considerably higher polarization.
Claims (18)
- Non-grain-oriented magnetic strip having high proportions of cubic or cubic surface texture, a polarization of > 1.7 T with a magnetic field strength of 2500 A/m and a low remagnetization loss, consisting of a steel having:
≦ 0.025 % C,
< 0.10 % Mn,
0.1 to 4.4 % Si,
0.1 to 4.4 % Al,
aluminium on condition that the following relations are met:
(% Si) + 2 (% Al) > 1.6 % and
(% Si) + (% Al) < 4.5 %,
if necessary a total of 0.005 to 0.15 % Sn and/or Sb as boundary surface active elements,
residue iron, including unavoidable impurities. - Magnetic strip according to claim 1, characterized in that it contains 0.5 to 4.0 % Si.
- Magnetic strip according to claim 2, characterized in that it contains 0.5 to 2.0 % Si.
- Magnetic strip according to one of claims 1 to 3, characterized in that it contains 0.3 to 2.0 % Al.
- Magnetic strip according to claim 1, characterized in that it contains a quantity of Si and Al such that the relation (% Si) + 2 (% Al) > 2 % is met.
- Magnetic strip according to one of claims 1 to 5, characterized in that it contains less than 0.08 % Mn.
- Magnetic strip according to claim 5, characterized in that it contains a maximum of 0.015 % C.
- Magnetic strip according to claim 1, characterized in that it contains 0.001 to 0.015 % C.
- Magnetic strip according to one of claims 1 to 8, characterized in that it contains a total of 0.005 to 0.15 % Sn and/or Sb as boundary surface active elements.
- A process for the production of non-grain-oriented magnetic strip having high proportions of cubic or cubic surface texture, a polarization of > 1.7 T with a magnetic field strength of 2500 A/m and a low remagnetization loss, consisting of a steel having:
≦ 0.025 % C,
< 0.10 % Mn,
0.1 to 4.4 % Si,
0.1 to 4.4 % Al,
aluminium on condition that the following relations are met:
(% Si) + 2 (% Al) > 1.6 % and
(% Si) + (% Al) < 4.5 %,
if necessary a total of 0.005 to 0.15 % Sn and/or Sb as boundary surface active elements,
residue iron, including unavoidable impurities,
which is hot rolled to a thickness of not less than 3.5 mm, whereafter the resulting hot rolled strip is cold rolled without recrystallizing intermediate annealing with a degree of deformation of at least 86% and the cold rolled strip is annealed. - A process according to claim 10, characterized in that during hot rolling in the finishing train, maximum deformation of 30 % per pass is performed if the slabs are at a temperature in the range of 1000 to 1060°C.
- A process according to claims 10 or 11, characterized in that hot rolling is performed with a final rolling temperature in the range of 900 to 960°C.
- A process according to one of claims 10 to 12, characterized in that during cold rolling to a thickness of 1.3 to 1.9 mm, a strip temperature of 180 to 300°C is maintained.
- A process according to one of claims 10 to 13, characterized in that with a strip thickness which is still 1.12 to 1.20 times the final thickness, the cold rolled strip is subjected to a non-recrystallizing recovery annealing, before it is then cold rolled to the final thickness.
- A process according to claim 14, characterized in that the annealing is performed for 1 to 10 hours in the temperature range of 400 to 500°C.
- A process for the production of a finally annealed magnetic strip according to one of claims 10 to 15, characterized in that the strip rolled to final thickness is preannealed, if necessary with decarburization, in a continuous furnace and then finally annealed in the temperature range of 900 to 1100°C.
- A process for the production of a magnetic strip according to one of claims 10 to 15 which is not finally annealed, characterized in that the cold rolled strip is annealed with recrystallization in a hood-type annealing furnace under H₂ atmosphere and is then afterrolled directionally or with a degree of deformation of less than 7%.
- A process for the production of a magnetic strip according to one of claims 10 to 15 which is not finally annealed, characterized in that the cold rolled strip is annealed with recrystallization for less than 5 minutes in a continuous furnace at a temperature in the range of 750 to 900°C.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD89335290A DD299102A7 (en) | 1989-12-06 | 1989-12-06 | METHOD FOR PRODUCING NONORIENTED ELECTROBLECH |
DD335290 | 1989-12-06 |
Publications (3)
Publication Number | Publication Date |
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EP0431502A2 EP0431502A2 (en) | 1991-06-12 |
EP0431502A3 EP0431502A3 (en) | 1993-02-03 |
EP0431502B1 true EP0431502B1 (en) | 1994-09-28 |
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ID=5614418
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Application Number | Title | Priority Date | Filing Date |
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EP90123040A Expired - Lifetime EP0431502B1 (en) | 1989-12-06 | 1990-12-01 | Non-oriented electrical strip and method of manufacturing |
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US (1) | US5258080A (en) |
EP (1) | EP0431502B1 (en) |
JP (1) | JPH04218647A (en) |
KR (1) | KR0177801B1 (en) |
AT (1) | ATE112326T1 (en) |
AU (1) | AU632876B2 (en) |
BR (1) | BR9006197A (en) |
CA (1) | CA2031579C (en) |
DD (1) | DD299102A7 (en) |
DE (2) | DE4038373A1 (en) |
ZA (1) | ZA909748B (en) |
Families Citing this family (15)
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JPH086135B2 (en) * | 1991-04-25 | 1996-01-24 | 新日本製鐵株式会社 | Manufacturing method of non-oriented electrical steel sheet with excellent magnetic properties |
DE4337605C2 (en) * | 1993-11-01 | 1996-02-08 | Eko Stahl Gmbh | Method for producing grain-oriented electrical steel and magnetic cores made therefrom |
US5714017A (en) * | 1995-05-02 | 1998-02-03 | Sumitomo Metal Industries, Ltd. | Magnetic steel sheet having excellent magnetic characteristics and blanking performance |
US6139650A (en) * | 1997-03-18 | 2000-10-31 | Nkk Corporation | Non-oriented electromagnetic steel sheet and method for manufacturing the same |
EP0897993B1 (en) * | 1997-08-15 | 2004-10-27 | JFE Steel Corporation | Electromagnetic steel sheet having excellent magnetic properties and production method thereof |
US6007642A (en) * | 1997-12-08 | 1999-12-28 | National Steel Corporation | Super low loss motor lamination steel |
DE19918484C2 (en) * | 1999-04-23 | 2002-04-04 | Ebg Elektromagnet Werkstoffe | Process for the production of non-grain oriented electrical sheet |
JP4507316B2 (en) * | 1999-11-26 | 2010-07-21 | Jfeスチール株式会社 | DC brushless motor |
DE10055338C1 (en) * | 2000-11-08 | 2002-03-07 | Thyssenkrupp Stahl Ag | Production of cold strip comprises hot rolling pre-material produced from steel, cold rolling hot strip to form cold strip, annealing at temperature which is lower than recrystallization temperature, cold deforming, and further annealing |
DE10156059A1 (en) * | 2001-11-16 | 2003-05-28 | Thyssenkrupp Electrical Steel Ebg Gmbh | Process for the production of non-grain-oriented electrical sheet |
DE10221793C1 (en) * | 2002-05-15 | 2003-12-04 | Thyssenkrupp Electrical Steel Ebg Gmbh | Non-grain oriented electrical steel or sheet and process for its manufacture |
JP4269139B2 (en) * | 2002-09-04 | 2009-05-27 | 住友金属工業株式会社 | Soft magnetic steel sheet excellent in workability and high-frequency magnetic properties and method for producing the same |
KR102043289B1 (en) | 2017-12-26 | 2019-11-12 | 주식회사 포스코 | Non-oriented electrical steel sheet and method for manufacturing the same |
CN112430778A (en) * | 2019-08-26 | 2021-03-02 | 宝山钢铁股份有限公司 | Thin non-oriented electrical steel plate and manufacturing method thereof |
CN113564489B (en) * | 2021-07-08 | 2022-07-15 | 首钢智新迁安电磁材料有限公司 | Low-grade non-oriented electrical steel and manufacturing method thereof |
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US3034935A (en) * | 1958-12-01 | 1962-05-15 | Gen Electric | Alloy bodies having improved magnetic properties and process for producing same |
US3279960A (en) * | 1962-12-31 | 1966-10-18 | Kobe Steel Ltd | Method for making bidirectional iron aluminium alloy magnetic sheet |
DE1966686C3 (en) * | 1969-05-08 | 1975-06-26 | Creusot-Loire, Paris | Process for the production of magnetic steel sheets with a cube texture |
US3761253A (en) * | 1969-12-05 | 1973-09-25 | Steel Corp | Steel for electrical applications and novel article |
US3971678A (en) * | 1972-05-31 | 1976-07-27 | Stahlwerke Peine-Salzgitter Aktiengesellschaft | Method of making cold-rolled sheet for electrical purposes |
JPS5413846B2 (en) * | 1973-06-18 | 1979-06-02 | ||
US3960616A (en) * | 1975-06-19 | 1976-06-01 | Armco Steel Corporation | Rare earth metal treated cold rolled, non-oriented silicon steel and method of making it |
JPS5468717A (en) * | 1977-11-11 | 1979-06-02 | Kawasaki Steel Co | Production of unidirectional silicon steel plate with excellent electromagnetic property |
JPS583027B2 (en) * | 1979-05-30 | 1983-01-19 | 川崎製鉄株式会社 | Cold rolled non-oriented electrical steel sheet with low iron loss |
US4291558A (en) * | 1979-07-27 | 1981-09-29 | Allegheny Ludlum Steel Corporation | Process of rolling iron-silicon strip material |
US4421574C1 (en) * | 1981-09-08 | 2002-06-18 | Inland Steel Co | Method for suppressing internal oxidation in steel with antimony addition |
JPS63317627A (en) * | 1987-06-18 | 1988-12-26 | Kawasaki Steel Corp | Semiprocessing non-oriented silicon steel sheet combining low iron loss with high magnetic permeability and its production |
-
1989
- 1989-12-06 DD DD89335290A patent/DD299102A7/en not_active IP Right Cessation
-
1990
- 1990-12-01 DE DE4038373A patent/DE4038373A1/en not_active Withdrawn
- 1990-12-01 EP EP90123040A patent/EP0431502B1/en not_active Expired - Lifetime
- 1990-12-01 DE DE59007334T patent/DE59007334D1/en not_active Expired - Fee Related
- 1990-12-01 AT AT90123040T patent/ATE112326T1/en not_active IP Right Cessation
- 1990-12-04 ZA ZA909748A patent/ZA909748B/en unknown
- 1990-12-04 US US07/622,259 patent/US5258080A/en not_active Expired - Fee Related
- 1990-12-05 CA CA002031579A patent/CA2031579C/en not_active Expired - Fee Related
- 1990-12-06 AU AU67841/90A patent/AU632876B2/en not_active Ceased
- 1990-12-06 BR BR909006197A patent/BR9006197A/en not_active IP Right Cessation
- 1990-12-06 JP JP2413601A patent/JPH04218647A/en active Pending
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Also Published As
Publication number | Publication date |
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ATE112326T1 (en) | 1994-10-15 |
DE59007334D1 (en) | 1994-11-03 |
CA2031579A1 (en) | 1991-06-07 |
DD299102A7 (en) | 1992-04-02 |
EP0431502A3 (en) | 1993-02-03 |
US5258080A (en) | 1993-11-02 |
DE4038373A1 (en) | 1991-06-27 |
AU6784190A (en) | 1991-06-13 |
BR9006197A (en) | 1991-09-24 |
ZA909748B (en) | 1991-10-30 |
KR0177801B1 (en) | 1999-02-18 |
EP0431502A2 (en) | 1991-06-12 |
AU632876B2 (en) | 1993-01-14 |
CA2031579C (en) | 2001-02-20 |
KR910012318A (en) | 1991-08-07 |
JPH04218647A (en) | 1992-08-10 |
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