EP1194599B1 - Procede de production d'une tole electrique a grains non orientes - Google Patents

Procede de production d'une tole electrique a grains non orientes Download PDF

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Publication number
EP1194599B1
EP1194599B1 EP00920746A EP00920746A EP1194599B1 EP 1194599 B1 EP1194599 B1 EP 1194599B1 EP 00920746 A EP00920746 A EP 00920746A EP 00920746 A EP00920746 A EP 00920746A EP 1194599 B1 EP1194599 B1 EP 1194599B1
Authority
EP
European Patent Office
Prior art keywords
annealing
rolling
deformation
strip
hot
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
Application number
EP00920746A
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German (de)
English (en)
Other versions
EP1194599A1 (fr
Inventor
Karl Ernst Friedrich
Brigitte Hammer
Rudolf Kawalla
Hans Pircher
Jürgen Schneider
Olaf Fischer
Carl-Dieter Wuppermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl AG
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Filing date
Publication date
Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Priority to SI200030173T priority Critical patent/SI1194599T1/xx
Publication of EP1194599A1 publication Critical patent/EP1194599A1/fr
Application granted granted Critical
Publication of EP1194599B1 publication Critical patent/EP1194599B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21D8/1244—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
    • 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
    • C21D8/1216—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
    • C21D8/1272—Final recrystallisation annealing

Definitions

  • the invention relates to a method for producing not grain-oriented electrical sheet, in which from a made of a steel material, such as cast Slabs, bands, curtains or thin slabs, a Hot strip is made, the electric sheet a low core loss and high Polarization and good mechanical properties has.
  • a steel material such as cast Slabs, bands, curtains or thin slabs
  • a Hot strip is made, the electric sheet a low core loss and high Polarization and good mechanical properties has.
  • Such non-grain oriented electrical sheets are mainly used as nuclear material in electrical Machines, such as motors and generators, with rotating magnetic flux direction used.
  • non-grain oriented electrical sheet are here under the DIN EN 10106 ("final annealed Electrical sheet ”) and DIN EN 10165 (“not final annealed Electrical sheet ”) falling electric sheets understood In addition, more anisotropic varieties are included, as long as they are not grain-oriented electrical sheets be valid.
  • Non-grain oriented Electrical sheet metal not only affects Non-grain oriented electrical sheets with high losses (P1.5 ⁇ 5 - 6 W / kg), but also sheets with medium (3.5 W / kg ⁇ P1.5 ⁇ 5.5 W / kg) and low losses (P1.5 ⁇ 3.5). Therefore one strives, the entire spectrum the weak, medium and highly silicated Electrotechnical steels in terms of its to improve magnetic polarization values.
  • the object of the invention is a inexpensive way to produce electrical sheets indicate with improved properties.
  • a method for producing non-grain oriented electrical steel sheet comprising: a starting material, such as cast slab, strip or thin slab, made of a steel having% by weight 0.001-0.05% C, 0.7-1 , 5% Si, ⁇ 0.4% Al, with Si + 2 Al ⁇ 1.7%, 0.1-1.2% Mn, optionally up to a total of 1.5% of alloying additives from the group P, Sn, Sb , Zr, V, Ti, N, Ni, Co, Nb and / or B, and the remainder being iron and customary impurities, a hot strip is produced by directing the starting material directly from the casting heat or after a previous reheating to at least 1000 At least 1180 ° C reheating temperature hot rolled in several forming passes and then coiled, wherein during hot rolling at least the first forming pass in Austenit with a total change in shape ⁇ h of at least 45% one or more Umformstichetechnik GmbHmaschineneau, ⁇ h of at least 45% one or more Um
  • the invention is based on the recognition that Electrical sheets with optimized properties through the Selection of specific forming rates during hot rolling in the phase regions ⁇ -phase (austenite), ⁇ / ⁇ -phase (Two-phase mixed region) and ⁇ -phase (ferrite) at transforming alloy of the type in question here can be produced. It has been shown that by a suitable combination of the phase sequence in Hot rolling in conjunction with certain final rolling and Reel temperatures are a crucial boost to the can achieve magnetic polarization.
  • the magnetic Properties of an electrical sheet by deformation during the individual in the course of hot rolling souformenen forming passes depending on the respective Microstructure influenced specifically. Decisive share has rolling in the austenite and ferrite regions, whereas the proportion of deformation in the two-phase mixed area should be as low as possible.
  • the invention Procedure is therefore particularly for the processing of such Fe-Si alloys are suitable, which no pronounced two-phase mixed area between the austenite and have the ferrite region.
  • the hot rolling according to the invention is usually in one formed of several rolling stands Finishing roll completed.
  • There is the Purpose of one or more stitches Walzens Austenit on the one hand, the transition from austenite to ferrite controlled within the Finishing roll to be able to perform.
  • On the other hand serve the austenit with Vietnamese formenen Umformstiche in addition, the thickness of the hot strip before the start of rolling in the ferrite region so that during the Ferrite rolling desirable overall shape change safely is reached.
  • Rolling in the ferrite area comprises also at least one forming pass.
  • several Umformstiche in ferrite go through to the required overall shape change of At least 45% safe to reach and so the desired To obtain adjustment of the hot strip structure.
  • total change in shape ⁇ h is understood here to mean the ratio of the decrease in thickness during rolling in the respective phase region to the thickness of the strip when entering the relevant phase region.
  • a hot strip produced according to the invention has, for example, a thickness h 0 after rolling in the austenite region. In the course of the subsequent rolling in the ferrite region, the thickness of the hot strip is reduced to h 1 .
  • the total change in shape ⁇ h during ferrite rolling should reach at least 45% in order to set a state of hot-rolled strip favoring the desired magnetic and technological properties in terms of grain size, texture and precipitations or to prepare it for the subsequent processing steps.
  • hot rolling can thus produce a hot strip, which can be used in the further for the production of an electrical steel and for the production of components with excellent magnetic properties. Costly additional processing steps or the maintenance of certain high temperatures during hot rolling are not required for this purpose.
  • the method according to the invention makes it possible to inexpensively produce a high-quality electrical sheet material by means of a rolling strategy which is optimized both with regard to the temperature control and with regard to the staggering of the deformations in conjunction with a suitably selected coiling temperature.
  • a particular with respect to the resulting during the implementation of a method rolling forces and the technological properties of the produced hot strip particularly advantageous embodiment of the invention is characterized in that the hot strip is so strongly cooled after the Austenit capable in the transformation that the ferrite conversion before the subsequent performed Forming is essentially complete.
  • the two-phase mixed area austenite / ferrite is passed through the two shortest paths between two forming passes, so that the rolled strip is rolled in the austenite area only in the ferrite area after rolling.
  • the total change in shape ⁇ h during rolling in the ferrite region should preferably be at least 50%. This rolling in the austenite and ferrite is carried out under exclusion of rolling in the mixed area austenite / ferrite.
  • a particularly suitable embodiment of the invention is characterized in that after the at least one forming pass in the austenite region, the hot strip undergoes at least one forming pass in the two-phase mixed region austenite / ferrite, during which a total degree of deformation ⁇ h of at most 30% is reached, during which process at least one subsequently in Ferrit capable carried out Umformstichs a Rescueumformgrad ⁇ h of at least 45% is achieved.
  • the extent of rolling in the two-phase mixing area is largely restricted and the center of gravity of the forming is placed on the rolling in the ferrite area.
  • a reel temperature of at least 700 ° C In compliance with this reel temperature can be an additional hot strip annealing whole or at least be saved to a substantial extent.
  • the hot strip is already softened in the coil, with his Characteristics determining characteristics, such as grain size, Texture and excretions are positively affected. It is particularly advantageous in this context, if the coiled hot strip from the coil heat of a direct Annealing is subjected and when the annealing time at a Annealing temperature above 700 ° C for at least 15 minutes is.
  • Such "in-line” annealing of the uncoiled at high temperature, not in the coil otherwise cooled hot-rolled strip may be otherwise possibly required hot strip annealing completely replace. This is how annealed hot strips can be with particularly good magnetic and technological Create properties. The required time and Energy expenditure is considerably lower than with the conventionally for improving the properties of Electric sheet performed hot strip annealing.
  • the reel temperature is less than 600 ° C, especially less than 550 ° C, is.
  • the reeling in These temperatures leads to a solidified Hot strip state.
  • this approach especially for steel too particularly good results, which is at least 0.7 Contain% by weight of Si.
  • At least one of the last in the ferrite area completed forming passes should be done with lubrication hot rolled.
  • hot rolling with lubrication on the one hand, lower shear deformations occur, so that the rolled strip resulted in a more homogeneous structure over the cross section receives.
  • the lubrication reduces the rolling forces, so that over the each rolling pass a higher reduction in thickness possible is. Therefore, it may, depending on the desired properties of the electric sheet to be produced, be advantageous if all rolled passes passed during hot rolling a rolling lubrication be performed.
  • the hot strip produced in accordance with the invention is especially due to its mechanical properties suitable, in one or more stages in a conventional manner a final thickness to be cold rolled. If that Cold rolling is carried out in several stages, should be in Connect to at least one of the cold rolling stages Intermediate annealing done to the good mechanical Maintain properties of the band.
  • Cold-rolled electrical steel produced according to the invention is excellent cutting and punching and is suitable as such, especially to components, such as lamellae or blanks to be processed.
  • components such as lamellae or blanks to be processed.
  • Processing of a "semi-finished" sheet suitably from this electrical sheet finished components at the user final annealing.
  • the final annealing of the cold-rolled electric sheet preferably in one decarburizing atmosphere.
  • the invention is based on Embodiments explained in more detail.
  • J2500 refers to the following the magnetic polarization at magnetic field strengths of 2500 A / m, 5000 A / m or 10000 A / m.
  • P 1.0 or P 1.5 is the Loss of magnetization at a polarization of 1.0 T. or 1.5 T and a frequency of 50 Hz understood.
  • Magnetic properties are each on individual strips measured along the rolling direction.
  • the steel C is a steel of the present invention having an Si content ranging from 0.7 to 1.5% by weight.
  • the magnetic properties J 2500 , J 5000 , J 10000 , P 1.0 and P 1.5 measured on individual strips along the rolling direction are for three electric sheets B1, B2, B3 made of the steels A, B, C specified.
  • the slabs cast from the steels A, B and C, respectively, have been reheated as starting material to a temperature of more than 1000 ° C. in each case and passed into a rolling scale. At least the first forming pass has been carried out exclusively in the austenite area in the finishing hot rolling mill. Following rolling in the austenite region, the hot strips were cooled to such an extent that the two-phase mixed area austenite / ferrite passed in a very short time and the ferrite conversion was completed before the next rolling stand was reached.
  • Table 3 shows the magnetic properties J 2500 , J 50000 , J 10000 , P 1.0 and P 1.5 for an electric sheet B4 produced based on the steel C of the present invention.
  • this electrical steel strip B4 has been coiled after hot rolling in the finishing roll scale at a temperature of 600.degree. The coiled hot-rolled strip was immediately cooled before it was fed to the cold strip for further processing.

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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)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Soft Magnetic Materials (AREA)

Claims (17)

  1. Procédé de production d'une tôle électrique à grains non orientés selon lequel un feuillard à chaud est fabriqué à partir d'une matière brute telle que les brames coulées, bandes, bandes primaires ou brames minces, élaborée en un acier composé en pourcentage en poids de
    C : 0,001 - 0,05 %
    Si: 0,7 - 1,5 %
    Al : ≤ 0,4 %
    avec Si + 2 Al ≤ 1,7 %
    Mn: 0,1-1,2%,
    le cas échéant jusqu'à 1,5 % maximum d'additions d'alliage du groupe P, Sn, Sb, Zr, V, Ti, N, Ni, Co, Nb et / ou B, et, comme reste, de fer ainsi que d'impuretés habituelles, la matière brute étant laminée à chaud avec la chaleur de coulée ou à la suite d'un réchauffement subséquent à une température de réchauffement minimum de 1000 °C et maximum de 1180 °C en plusieurs passes de laminage, pour être ensuite bobinée, la première passe au moins, durant le laminage à chaud, étant effectuée dans la zone austénitique, puis une ou plusieurs passes dans la zone ferritique avec une déformation totale εh de 45 % au moins.
  2. Procédé selon la revendication 1, caractérisé en ce que le feuillard à chaud, suite au formage dans la zone austénitique, est fortement refroidi, de sorte que la transformation ferritique est essentiellement terminée avant le formage effectué subséquemment.
  3. Procédé selon la revendication 2, caractérisé en ce que la déformation totale εh obtenue durant le laminage dans la zone ferritique est de 50 % au minimum.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le feuillard à chaud, suite à l'au moins une passe de laminage dans la zone austénitique, traverse au moins une passe de laminage dans la zone mixte de deux phases austénitique / ferritique, la déformation totale εh alors obtenue étant de 30 % maximum, et que durant l'au moins une passe effectuée ensuite dans la zone ferritique, une déformation totale εh de 45 % minimum est obtenue.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la température de bobinage est de 700 °C au minimum.
  6. Procédé selon la revendication 5, caractérisé en ce que le feuillard à chaud bobiné est soumis à un recuit direct à partir de la chaleur de coil et que le temps de recuit est de 15 minutes au minimum avec une température de recuit supérieure à 700 °C.
  7. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la température de bobinage est inférieure à 600 °C, notamment inférieure à 550 °C.
  8. Procédé selon la revendication 7, caractérisé en ce que le feuillard à chaud est refroidi de manière accélérée, directement à la suite du bobinage sur coil.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une passe de laminage au moins, avec lubrification, est effectuée durant le laminage à chaud dans la zone ferritique.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le feuillard à chaud, suite au bobinage, est recuit à une température de recuit de 740 °C minimum.
  11. Procédé selon la revendication 10, caractérisé en ce que le recuit du feuillard à chaud bobiné sur coil est effectué dans un four à cloche.
  12. Procédé selon la revendication 10, caractérisé en ce que le recuit est effectué dans un four à passage continu.
  13. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le feuillard à chaud est laminé à froid sur épaisseur finale à une seule ou plusieurs phases.
  14. Procédé selon la revendication 13, caractérisé en ce que le laminage à froid est effectué à plusieurs phases et qu'un recuit intermédiaire est effectué à la suite d'une phase de laminage à froid au moins.
  15. Procédé selon l'une quelconque des revendications 13 et 14, caractérisé en ce que le feuillard à froid subit un recuit final à une température de recuit de > 740 °C, à la suite du laminage à froid.
  16. Procédé selon les revendications 14 et 15, caractérisé en ce que le feuillard à froid, suite au laminage à froid, est recuit dans un four à cloche ou un four continu de recuit à des températures de recuit de > 650 °C, en vue de la recristallisation pour former une tôle électrique sans recuit final, avec dressage et laminage d'écrouissage subséquents.
  17. Procédé selon l'une quelconque des revendications 13 et 14, caractérisé en ce que le recuit est effectué dans une atmosphère de décarburation.
EP00920746A 1999-07-05 2000-04-29 Procede de production d'une tole electrique a grains non orientes Expired - Lifetime EP1194599B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200030173T SI1194599T1 (en) 1999-07-05 2000-04-29 Method for producing non-grain oriented electric sheet steel

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19930518A DE19930518C1 (de) 1999-07-05 1999-07-05 Verfahren zum Herstellen von nicht kornorientiertem Elektroblech
DE19930518 1999-07-05
PCT/EP2000/003901 WO2001002611A1 (fr) 1999-07-05 2000-04-29 Procede de production d'une tole electrique a grains non orientes

Publications (2)

Publication Number Publication Date
EP1194599A1 EP1194599A1 (fr) 2002-04-10
EP1194599B1 true EP1194599B1 (fr) 2003-07-16

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EP00920746A Expired - Lifetime EP1194599B1 (fr) 1999-07-05 2000-04-29 Procede de production d'une tole electrique a grains non orientes

Country Status (6)

Country Link
EP (1) EP1194599B1 (fr)
AT (1) ATE245203T1 (fr)
AU (1) AU4120600A (fr)
DE (2) DE19930518C1 (fr)
ES (1) ES2202104T3 (fr)
WO (1) WO2001002611A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003014404A1 (fr) * 2001-08-11 2003-02-20 Thyssenkrupp Electrical Steel Ebg Gmbh Tole ou bande magnetique a grains non orientes et procede de fabrication de ladite tole ou bande
DE10150642A1 (de) * 2001-10-12 2003-04-30 Thyssenkrupp Stahl Ag Verfahren zum Herstellen von nicht kornorientierten Elektroblechen
KR100862616B1 (ko) * 2007-04-17 2008-10-09 한국전자통신연구원 인덱스 정보를 이용한 오디오 핑거프린트 검색 시스템 및방법
DE102013019787A1 (de) * 2013-11-27 2015-05-28 Valeo Schalter Und Sensoren Gmbh Verfahren zum Herstellen eines ferromagnetischen Bauteils für einen Drehmomentsensor einer Fahrzeuglenkwelle und Drehmomentsensor
DE102019216240A1 (de) * 2019-10-22 2021-04-22 Muhr Und Bender Kg Verfahren und Vorrichtung zur Herstellung eines nicht-kornorientierten Elektrobands

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0723509B2 (ja) * 1988-10-13 1995-03-15 新日本製鐵株式会社 優れた鉄損特性を有する無方向性電磁鋼板の製造方法
JPH036326A (ja) * 1989-06-01 1991-01-11 Kobe Steel Ltd 磁気特性の優れた無方向性電磁鋼板の製造方法
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.
BE1007927A3 (fr) * 1994-02-07 1995-11-21 Cockerill Rech & Dev Procede de production d'acier doux.
EP0779369B1 (fr) * 1994-06-24 2000-08-23 Nippon Steel Corporation Procede de fabrication de tole d'acier electrique non orientee presentant une densite elevee de flux magnetique et un niveau faible de pertes en fer
JP3319898B2 (ja) * 1994-12-20 2002-09-03 川崎製鉄株式会社 コイル内で磁気特性の均一な無方向性電磁鋼帯の製造方法
DE19807122C2 (de) * 1998-02-20 2000-03-23 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von nichtkornorientiertem Elektroblech

Also Published As

Publication number Publication date
ATE245203T1 (de) 2003-08-15
WO2001002611A1 (fr) 2001-01-11
ES2202104T3 (es) 2004-04-01
DE19930518C1 (de) 2000-10-12
AU4120600A (en) 2001-01-22
EP1194599A1 (fr) 2002-04-10
DE50002924D1 (de) 2003-08-21

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