EP0469980B1 - Verfahren zur Herstellung nichtkornorientierter magnetischer Stahlbleche und also erhaltene Stahlbleche - Google Patents

Verfahren zur Herstellung nichtkornorientierter magnetischer Stahlbleche und also erhaltene Stahlbleche Download PDF

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Publication number
EP0469980B1
EP0469980B1 EP91402117A EP91402117A EP0469980B1 EP 0469980 B1 EP0469980 B1 EP 0469980B1 EP 91402117 A EP91402117 A EP 91402117A EP 91402117 A EP91402117 A EP 91402117A EP 0469980 B1 EP0469980 B1 EP 0469980B1
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EP
European Patent Office
Prior art keywords
tesla
sheet
process according
heat treatment
temperature
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.)
Expired - Lifetime
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EP91402117A
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English (en)
French (fr)
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EP0469980A1 (de
Inventor
André Bertoni
Jean-Luc Laverny
Jean Verdun
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USINOR SA
Sollac SA
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USINOR Sacilor SA
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Classifications

    • 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
    • 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
    • C21D8/1261—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 following hot rolling

Definitions

  • the present invention relates to a method of manufacturing a sheet of magnetic steel with non-oriented grain called "fully process” and the sheet obtained by this process.
  • Such a method is known and commonly used in the field of making magnetic sheets with non-oriented grains.
  • Magnetic sheets known as non-oriented grain, that is to say having isotropic magnetic properties are more particularly intended for the construction of electromagnetic devices in which the magnetic flux generated by the electrical windings is not constant, such as for example in rotating machines.
  • Some transformers used in the household appliance sector use this type of quality for economic reasons.
  • These electromagnetic devices consist of cut and assembled sheets.
  • the latter have a degree of efficiency which is evaluated according to two parameters which are the level of induction on the one hand, and the specific total losses, on the other hand.
  • the induction is limited by the saturation magnetization of the sheets and this magnetization is higher the higher the material is rich in iron.
  • Vacuum processing improves the cleanliness and purity of the steel and thus reduces losses by hysteresis.
  • Non-oriented grain sheets made from steel with a silicon content of about 3% currently have the best magnetic loss characteristics and a lower saturation magnetization than magnetic sheets whose steel contains little or no silicon.
  • magnetic sheets with non-oriented grains are used, made with a steel containing, in its composition, only one very low silicon content, that is to say a content of less than 0.5%.
  • Document EP-A-0434641 thus discloses a composition containing 0.2 to 2% of silicon but also 0.2 to 0.5% of aluminum.
  • the so-called oriented grain sheets have a very high proportion of grains having an orientation (110). [001]. These sheets have excellent magnetic properties in the direction of rolling. They are anisotropic, that is to say that their properties depend on the direction of rolling. Thus, for example, the losses of a magnetic sheet of common composition, 0.35 mm thick, are three times higher in the direction perpendicular to the direction of rolling than in the direction of rolling.
  • Sheets with anisotropic magnetic properties therefore have the disadvantage that they can only be used for applications in which the magnetic field lines correspond to the direction of rolling. It is therefore a question of using them for static machines such as transformers.
  • the initial annealing operation after hot rolling has the function of influencing the state of the precipitates, for example MnS and / or AlN with respect to the microstructure of the sheets so as to promote the further development of the growth of oriented grains to form a GOSS texture.
  • the object of the invention is to improve the magnetic characteristics of non-oriented grain sheets made from steel containing very little silicon, that is to say to reduce the magnetic losses and to increase the magnetization under a determined magnetic field.
  • This process contributes to an improvement in the magnetic qualities, that is to say a reduction in the specific total losses and also an increase in the magnetization.
  • the steel is produced under vacuum and continuously cast in the form of slabs.
  • the sheet is produced during the hot rolling operation after rolling with slabs using a band train.
  • Table I groups together the values of the magnetic characteristics obtained in a series of tests for variation of the conditions of the heat treatment prior to cold rolling.
  • the tests were carried out by varying the temperature of the treatment from 700 ° C. to 1100 ° C., the temperature holding times being variable from 1 to 5 minutes.
  • results of the tests show, by comparison with the characteristics of a sample which has not undergone treatment, that the preliminary treatment makes it possible to increase, on the one hand the inductions of about 5% and on the other hand to reduce the losses about 12%.
  • Table II groups together, for two thicknesses of magnetic sheets, the loss characteristics in W / Kg at 50 Hertz under an induction of 1 and 1.5 Tesla, as well as the induction obtained under the three values of magnetic fields taken as reference. .
  • the method according to the invention makes it possible, unexpectedly, to obtain from a magnetic sheet, on the one hand, high magnetic characteristics, and on the other hand mechanical characteristics comparable to those obtained by the method of the prior art.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)

Claims (10)

  1. Verfahren zur Herstellung eines magnetischen Stahlbleches mit einem nicht-orientierten Korngefüge, nach dem sogenannten "fully process", das nach dem Erschmelzen eines Siliciumstahls unter Vakuum die folgenden aufeinanderfolgenden Stufen umfaßt:
    - Warmwalzen und anschließendes Aufwickeln (Haspeln);
    - Sandstrahlen und Beizen;
    - Kaltwalzen, das mindestens eine Stufe umfaßt, und anschließendes Glühen zur Herstellung eines Bleches mit der Enddicke, wobei das Schlußglühen unter einer kontrollierten entkohlenden Atmosphäre durchgeführt wird; wobei in dem Verfahren:
    - das Stahlblech die folgende, auf das Gewicht bezogene Zusammensetzung hat:
    Kohlenstoff   ≤ 0,008 %
    Silicium   ≤ 0,4 %
    Mangan   (0,05-0,4) %
    Aluminium   < 0,05 %
    Schwefel   < 0,01 %
    Phosphor   < 0,19 %
    Stickstoff   < 0,01 %
    Sauerstoff   < 0,01 %
    wobei der Rest der Zusammensetzung aus Eisen und unvermeidlichen Verunreinigungen besteht; und
    - das Aufwickeln nach dem Warmwalzen bei einer Temperatur oberhalb 600°C durchgeführt wird, woran sich eine Wärmebehandlung bei einer Temperatur oberhalb 700°C unter einer im wesentlichen aus Stickstoff bestehenden kontrollierten Atmosphäre anschließt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Sandstrahlen und saure Beizen nach dem Aufwickeln (Haspeln) und nach der thermischen Behandlung durchgeführt werden.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Aufwikkel(Haspel)temperatur in dem Intervall von 600°C bis 750°C und vorzugsweise zwischen 600 und 680°C liegt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die dem Kaltwalzen vorhergehende Wärmebehandlung umfaßt:
    - die Einstellung einer kontrollierten Atmosphäre;
    - die Erhöhung der Temperatur auf einen Wert in dem Intervall von 700 bis 1100°C;
    - und das Aufrechterhalten der Temperatur während einer Zeitspanne in dem Intervall von 1 bis 10 min.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Temperatur der thermischen Behandlung vor dem Kaltwalzen zwischen 800 und 1050°C liegt.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Zeitspanne, während der die Temperatur der vorhergehenden Wärmebehandlung aufrechterhalten wird, 1 bis 5 min beträgt.
  7. Magnetblech mit nicht-orientiertem Korngefüge, wie es bei dem Verfahren nach einem der Ansprüche 1 bis 6 erhalten wird, dadurch gekennzeichnet, daß es die folgende, auf das Gewicht bezogene Zusammensetzung hat:
    Kohlenstoff   ≤ 0,008 %
    Silicium   ≤ 0,4 %
    Mangan   (0,05-0,4) %
    Aluminium   < 0,05 %
    Schwefel   < 0,01 %
    Phosphor   < 0,19 %
    Stickstoff   < 0,01 %
    Sauerstoff   < 0,01 %
       wobei der Rest der Zusammensetzung aus Eisen und unvermeidlichen Verunreinigungen besteht;
    und daß für ein Blech mit einer Dicke von etwa 0,5 mm die spezifischen Verluste bei 1,5 Tesla und 50 Hertz unterhalb 6,3 W/kg liegen und die Magnetisierung bei Magneffeldern von 2500, 5000 bzw. 10 000 A/m oberhalb 1,65; 1,74 bzw. 1,85 Tesla erfolgt.
  8. Blech nach Anspruch 7, dadurch gekennzeichnet, daß die spezifischen Verluste bei 1,5 Tesla und 50 Hertz unterhalb 5,1 W/kg liegen und die Magnetisierung bei Magneffeldern von 2500, 5000 bzw. 10 000 A/m oberhalb 1,68; 1,77 bzw. 1,89 Tesla erfolgt.
  9. Magnetblech mit nicht-orientiertem Komgefüge, wie es nach dem Verfahren nach einem der Ansprüche 1 bis 6 erhalten wird, dadurch gekennzeichnet, daß es die folgende, auf das Gewicht bezogene Zusammensetzung hat:
    Kohlenstoff   ≤ 0,008 %
    Silicium   ≤ 0,4 %
    Mangan   (0,05-0,4) %
    Aluminium   < 0,05 %
    Schwefel   < 0,01 %
    Phosphor   < 0,19 %
    Stickstoff   < 0,01 %
    Sauerstoff   < 0,01 %
       wobei der Rest der Zusammensetzung aus Eisen und unvermeidlichen Verunreinigungen besteht;
    und daß für ein Blech mit einer Dicke von etwa 0,65 mm die spezifischen Verluste bei 1,5 Tesla und 50 Hertz unterhalb 7,5 W/kg liegen und die Magnetisierung bei Magneffeldern von 2500, 5000 und 10 000 A/m oberhalb 1,66; 1,75 bzw. 1,86 Tesla erfolgt.
  10. Blech nach Anspruch 9, dadurch gekennzeichnet, daß die spezifischen Verluste bei 1,5 Tesla und 50 Hertz unterhalb 7,1 W/kg liegen und die Magnetisierung bei Magneffeldern von 2500, 5000 und 10 000 A/m oberhalb 1,67; 1,76 bzw. 1,88 Tesla erfolgt.
EP91402117A 1990-07-30 1991-07-29 Verfahren zur Herstellung nichtkornorientierter magnetischer Stahlbleche und also erhaltene Stahlbleche Expired - Lifetime EP0469980B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009694 1990-07-30
FR9009694A FR2665181B1 (fr) 1990-07-30 1990-07-30 Procede de fabrication de tole d'acier magnetique a grains non orientes et tole obtenue par ce procede.

Publications (2)

Publication Number Publication Date
EP0469980A1 EP0469980A1 (de) 1992-02-05
EP0469980B1 true EP0469980B1 (de) 1996-07-10

Family

ID=9399224

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EP91402117A Expired - Lifetime EP0469980B1 (de) 1990-07-30 1991-07-29 Verfahren zur Herstellung nichtkornorientierter magnetischer Stahlbleche und also erhaltene Stahlbleche

Country Status (7)

Country Link
EP (1) EP0469980B1 (de)
AT (1) ATE140271T1 (de)
DE (1) DE69120738T2 (de)
DK (1) DK0469980T3 (de)
ES (1) ES2091889T3 (de)
FR (1) FR2665181B1 (de)
GR (1) GR3020930T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19807122A1 (de) * 1998-02-20 1999-09-09 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von nichtkornorientiertem Elektroblech
DE102021115174A1 (de) 2021-06-11 2021-11-11 Technische Universität Bergakademie Freiberg, Körperschaft des öffentlichen Rechts Verfahren zur Herstellung eines höherpermeablen, nichtkornorientierten Elektrobleches und dessen Verwendung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19930519C1 (de) * 1999-07-05 2000-09-14 Thyssenkrupp Stahl Ag Verfahren zum Herstellen von nicht kornorientiertem Elektroblech
BE1006599A6 (fr) * 1993-01-29 1994-10-25 Centre Rech Metallurgique Procede de fabrication d'une tole d'acier laminee a chaud presentant des proprietes magnetiques elevees.
DE4302813C2 (de) * 1993-02-02 1996-01-18 Dresden Ev Inst Festkoerper Verfahren zur Herstellung einer Würfelflächentextur ((100) [Okl]) in Elektroblechen
BE1007927A3 (fr) * 1994-02-07 1995-11-21 Cockerill Rech & Dev Procede de production d'acier doux.
FR2744135B1 (fr) 1996-01-25 1998-02-27 Usinor Sacilor Procede de fabrication de tole d'acier magnetique a grains non orientes et tole obtenue par le procede
DE19918484C2 (de) * 1999-04-23 2002-04-04 Ebg Elektromagnet Werkstoffe Verfahren zum Herstellen von nichtkornorientiertem Elektroblech
DE10221793C1 (de) 2002-05-15 2003-12-04 Thyssenkrupp Electrical Steel Ebg Gmbh Nichtkornorientiertes Elektroband oder -blech und Verfahren zu seiner Herstellung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057500A (en) * 1979-09-07 1981-04-01 British Steel Corp Improvements in electro magnetic steels
EP0263413A2 (de) * 1986-09-29 1988-04-13 Nippon Kokan Kabushiki Kaisha Nicht-orientierte Elektrobleche und Herstellung nicht-orientierter Elektrobleche
EP0434641A2 (de) * 1989-12-22 1991-06-26 CENTRO SVILUPPO MATERIALI S.p.A. Verfahren zur Herstellung von nichtkornorientierten Elektrostahlhalbzeugen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1531090A (fr) * 1966-07-13 1968-06-28 Koninklijke Hoogovens En Staal Procédé de fabrication de l'acier à dynamos
JPS4819766B1 (de) * 1970-03-30 1973-06-15
JPS58117828A (ja) * 1981-12-28 1983-07-13 Nippon Steel Corp 鉄損が低く磁束密度の高いセミプロセス無方向性電磁鋼板の製造方法
JPS58204126A (ja) * 1982-05-21 1983-11-28 Kawasaki Steel Corp 磁気特性のすぐれた無方向性電磁鋼帯の製造方法
JPH0788530B2 (ja) * 1987-06-24 1995-09-27 住友金属工業株式会社 磁束密度の高い無方向性電磁鋼板の製造方法
JP2501219B2 (ja) * 1987-12-25 1996-05-29 川崎製鉄株式会社 無方向性電磁鋼板の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057500A (en) * 1979-09-07 1981-04-01 British Steel Corp Improvements in electro magnetic steels
EP0263413A2 (de) * 1986-09-29 1988-04-13 Nippon Kokan Kabushiki Kaisha Nicht-orientierte Elektrobleche und Herstellung nicht-orientierter Elektrobleche
EP0434641A2 (de) * 1989-12-22 1991-06-26 CENTRO SVILUPPO MATERIALI S.p.A. Verfahren zur Herstellung von nichtkornorientierten Elektrostahlhalbzeugen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol. 12 no. 155 (C-494),12.05.88, & JP-A-62 267 421 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19807122A1 (de) * 1998-02-20 1999-09-09 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von nichtkornorientiertem Elektroblech
DE19807122C2 (de) * 1998-02-20 2000-03-23 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von nichtkornorientiertem Elektroblech
DE102021115174A1 (de) 2021-06-11 2021-11-11 Technische Universität Bergakademie Freiberg, Körperschaft des öffentlichen Rechts Verfahren zur Herstellung eines höherpermeablen, nichtkornorientierten Elektrobleches und dessen Verwendung

Also Published As

Publication number Publication date
ES2091889T3 (es) 1996-11-16
EP0469980A1 (de) 1992-02-05
ATE140271T1 (de) 1996-07-15
FR2665181A1 (fr) 1992-01-31
DE69120738T2 (de) 1996-11-21
GR3020930T3 (en) 1996-12-31
FR2665181B1 (fr) 1994-05-27
DE69120738D1 (de) 1996-08-14
DK0469980T3 (da) 1996-11-18

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