EP2356263B1 - Verfahren zum herstellen eines verbesserten elektrobandes - Google Patents

Verfahren zum herstellen eines verbesserten elektrobandes Download PDF

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Publication number
EP2356263B1
EP2356263B1 EP09756690.5A EP09756690A EP2356263B1 EP 2356263 B1 EP2356263 B1 EP 2356263B1 EP 09756690 A EP09756690 A EP 09756690A EP 2356263 B1 EP2356263 B1 EP 2356263B1
Authority
EP
European Patent Office
Prior art keywords
steel strip
recited
electrical steel
oxide layer
less
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09756690.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2356263A1 (de
Inventor
Jochen Bogner
Franz Citroni
Gerald Kasberger
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.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Priority to SI200930672T priority Critical patent/SI2356263T1/sl
Priority to PL09756690T priority patent/PL2356263T3/pl
Publication of EP2356263A1 publication Critical patent/EP2356263A1/de
Application granted granted Critical
Publication of EP2356263B1 publication Critical patent/EP2356263B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor

Definitions

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

Landscapes

  • 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)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Soft Magnetic Materials (AREA)
EP09756690.5A 2008-12-12 2009-10-23 Verfahren zum herstellen eines verbesserten elektrobandes Not-in-force EP2356263B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200930672T SI2356263T1 (sl) 2008-12-12 2009-10-23 Postopek izdelave izboljšanega jeklenega električnega traku
PL09756690T PL2356263T3 (pl) 2008-12-12 2009-10-23 Sposób wytwarzania ulepszonej taśmy elektrotechnicznej

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008061983A DE102008061983B4 (de) 2008-12-12 2008-12-12 Verfahren zum Herstellen eines verbesserten Elektrobandes, Elektroband und dessen Verwendung
PCT/EP2009/063964 WO2010066497A1 (de) 2008-12-12 2009-10-23 Verfahren zum herstellen eines verbesserten elektrobandes

Publications (2)

Publication Number Publication Date
EP2356263A1 EP2356263A1 (de) 2011-08-17
EP2356263B1 true EP2356263B1 (de) 2013-05-22

Family

ID=41461052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09756690.5A Not-in-force EP2356263B1 (de) 2008-12-12 2009-10-23 Verfahren zum herstellen eines verbesserten elektrobandes

Country Status (10)

Country Link
US (1) US20110297292A1 (pl)
EP (1) EP2356263B1 (pl)
JP (1) JP2012511628A (pl)
KR (1) KR20110111404A (pl)
BR (1) BRPI0916493A2 (pl)
DE (1) DE102008061983B4 (pl)
PL (1) PL2356263T3 (pl)
RU (1) RU2499845C2 (pl)
SI (1) SI2356263T1 (pl)
WO (1) WO2010066497A1 (pl)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
GB2555104B (en) * 2016-10-14 2022-06-01 Liberty Performance Steels Ltd Manufacture of a stress relieved length of steel having an oxidised surface layer
JP6944146B1 (ja) * 2020-08-03 2021-10-06 トヨタ紡織株式会社 熱処理方法及び熱処理炉

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030950A (en) * 1976-06-17 1977-06-21 Allegheny Ludlum Industries, Inc. Process for cube-on-edge oriented boron-bearing silicon steel including normalizing
SU667595A1 (ru) * 1978-01-30 1979-06-15 Предприятие П/Я Г-4012 Способ термической обработки листов магнитопроводов
JPS55158220A (en) * 1979-05-24 1980-12-09 Nippon Steel Corp Forming method of insulating film excellent in heat resistance on electrical sheet
JPS60121222A (ja) * 1983-12-02 1985-06-28 Kawasaki Steel Corp 一方向性珪素鋼板の製造方法
JPS6213530A (ja) * 1985-07-12 1987-01-22 Hitachi Ltd 密閉型圧縮機用電磁鋼板の焼鈍・ブル−イング同時処理法
RU2049127C1 (ru) * 1993-02-23 1995-11-27 Чекалов Виталий Петрович Способ термической обработки листов магнитопровода
JPH08337824A (ja) * 1995-06-08 1996-12-24 Nippon Steel Corp 積層電磁鋼用の電磁鋼板製造方法
US6221501B1 (en) * 1999-08-17 2001-04-24 Ltv Steel Company, Inc. Steel with electrically insulating hematite layer
JP2004043941A (ja) * 2002-07-16 2004-02-12 Nippon Steel Corp 変色の少ない鋼板の連続焼鈍方法および装置
DE10258531B3 (de) * 2002-12-14 2004-04-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Herstellung korrosionsschutzbeschichteter Stähle
US7361238B1 (en) * 2004-06-01 2008-04-22 Tempel Steel Company Annealing furnace purging and oxidation system and method

Also Published As

Publication number Publication date
SI2356263T1 (sl) 2013-09-30
BRPI0916493A2 (pt) 2016-02-16
RU2499845C2 (ru) 2013-11-27
KR20110111404A (ko) 2011-10-11
PL2356263T3 (pl) 2013-10-31
US20110297292A1 (en) 2011-12-08
DE102008061983A1 (de) 2010-06-17
DE102008061983B4 (de) 2011-12-08
JP2012511628A (ja) 2012-05-24
RU2011128544A (ru) 2013-01-20
EP2356263A1 (de) 2011-08-17
WO2010066497A1 (de) 2010-06-17

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