WO2025008095A1 - Bande ou feuille électrique métallique à grains non orientés, procédé de production d'une bande électrique à grains non orientés et utilisation - Google Patents

Bande ou feuille électrique métallique à grains non orientés, procédé de production d'une bande électrique à grains non orientés et utilisation Download PDF

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Publication number
WO2025008095A1
WO2025008095A1 PCT/EP2024/062237 EP2024062237W WO2025008095A1 WO 2025008095 A1 WO2025008095 A1 WO 2025008095A1 EP 2024062237 W EP2024062237 W EP 2024062237W WO 2025008095 A1 WO2025008095 A1 WO 2025008095A1
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Prior art keywords
strip
electrical
degrees celsius
sheet
grain
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PCT/EP2024/062237
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German (de)
English (en)
Inventor
Anton Vidovic
Nina Maria WINKLER
Olaf Fischer
Aleksander MATOS COSTA
Karsten MACHALITZA
Jan LÜBKE
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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Priority to CN202480044571.7A priority Critical patent/CN121420079A/zh
Priority to KR1020257043139A priority patent/KR20260013997A/ko
Publication of WO2025008095A1 publication Critical patent/WO2025008095A1/fr
Priority to MX2025015254A priority patent/MX2025015254A/es
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
    • C21D8/125—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment with application of tension
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
    • C21D8/1261—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
    • C21D8/1272—Final recrystallisation annealing
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14775—Fe-Si based alloys in the form of sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets

Definitions

  • Non-grain-oriented metallic electrical steel strip or sheet process for producing a non-grain-oriented electrical steel strip and use
  • the invention relates to non-grain-oriented metallic electrical steel strip or sheet.
  • the invention also relates to a method for producing a non-grain-oriented electrical steel strip and to a use thereof.
  • Non-grain-oriented flat products in particular non-grain-oriented electrical steel strip or sheet, are required in many electrical engineering applications and are known from practice.
  • the non-grain-oriented electrical steel or strip is used to guide and amplify electromagnetic fields. Typical applications for such steel strips and sheets are rotors and stators in electric motors and electric generators.
  • non-grain-oriented metallic flat products are required, in particular non-grain-oriented electrical steel and non-grain-oriented electrical sheet, which combine comparatively low remagnetization losses at comparatively high frequencies with comparatively high magnetic polarization and induction as well as comparatively high permeability, in particular in the relevant ranges of the magnetic field strength, i.e. at comparatively low magnetic field strengths.
  • a further challenge that arises when looking for suitable materials lies in the planned application in high-frequency electromagnetic alternating fields, which are often accompanied by rotary movements at high rotation frequencies: In order to be able to withstand the resulting mechanical loads for a sufficiently long time, the materials must be sufficiently strong, in particular a sufficiently high 0.2% yield strength. This presents a particular difficulty, particularly with regard to the alloy composition to be found, since measures to improve high-frequency suitability are often accompanied by a deterioration in strength.
  • the invention is based on the task of providing alternatives to the known electrical strips or sheets which meet the requirements in terms of their magnetic properties on the one hand and their mechanical properties on the other to the same or greater extent and at the same time enable them to be produced in small thicknesses.
  • the developers' main aim is to ensure good handling, particularly with a view to avoiding as far as possible any impairment of cold rollability.
  • the invention is solved with a non-grain-oriented metallic electrical strip or sheet having the features of claim 1 and with a method for producing a non-grain-oriented electrical strip having the features of claim 10.
  • the invention is also solved with an electrical strip having the features of claim 20 and with a use according to claim 21.
  • a non-grain-oriented metallic electrical strip or sheet is provided.
  • the non-grain-oriented metallic electrical strip or sheet consists of a composition with the following components, each in percent by weight, in short: % by weight:
  • Si 2.8 up to 3.2, preferably 2.9 up to 3.1
  • Al 1.3 up to 1.7, preferably 1.40 up to 1.60;
  • Mn 0.5 to 0.7, preferably 0.55 to 0.65;
  • P up to 0.040, preferably up to 0.020;
  • Ti up to 0.0070, preferably up to 0.0040;
  • the electrical strip or sheet according to the invention is characterized in that it has a thickness ⁇ 0.270 mm, preferably ⁇ 0.260 mm, and a 0.2% yield strength Rp0.2 > 420 MPa.
  • the material characteristic yield strength Rp0.2 is to be understood as determined according to DIN EN ISO 6892-1:2020-06.
  • the electrical steel strip or sheet showed particularly good properties when the composition of the alloy was as follows:
  • Ti up to 0.0070, preferably up to 0.0040;
  • P up to 0.040, preferably up to 0.020;
  • Ti up to 0.0070, preferably up to 0.0040;
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • P up to 0.040, preferably up to 0.020;
  • Ti up to 0.0070, preferably up to 0.0040;
  • the electrical steel strip or sheet showed particularly good properties when the composition of the alloy was as follows:
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • P up to 0.040, preferably up to 0.020;
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • P up to 0.040, preferably up to 0.020;
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • Si 2.9 up to 3.0; Al: 1.40 up to 1.60;
  • This embodiment has the particular advantage that the Si content is even more limited upwards, with the advantage that disadvantages associated with the addition of Si, such as the effects of brittleness, can be further reduced.
  • the relationship should apply according to which Al/(Si + Al) has a value between 0.30 and 0.40, preferably between 0.30 and 0.35. This means that the quotient of the weight proportion of Al and the sum of the weight proportions of Si and Al has a value between 0.30 and 0.40, preferably between 0.30 and 0.35.
  • the upper limit ensures that the Si proportion is sufficiently high to ensure a reduction in the magnetization losses as a result of the increase in the electrical resistance due to Si
  • the lower limit ensures that the Si proportion within the total of Si and Al does not exceed an acceptable level of impairment of the processability of the electrical strip or sheet.
  • Mn contents in a previously unusual amount. It was found that Mn contents of up to 0.7 wt.% in combination with the other element contents provided for in the invention did not result in any qualitatively detectable tendency to embrittlement.
  • the electrical strip or sheet preferably has an average grain size of between 60 and 100 micrometers, particularly preferably between 70 and 95 micrometers, which favors advantageously low magnetization losses.
  • the thickness of the electrical strip or sheet is between 0.180 mm and 0.270 mm, preferably between 0.230 mm and 0.270 mm, particularly preferably between 0.235 mm and 0.250 mm, whereby these are thicknesses that are advantageous for current applications in electromobility and therefore an industrial demand is expected.
  • the electrical steel strip or sheet has a 0.2% yield strength Rp0.2 with 430 MPa ⁇ Rp0.2 ⁇ 470 MPa. In this range, samples with sufficiently good strength are available, which was demonstrated by the experiments carried out.
  • the electrical steel strip or sheet has an A8 O elongation at break of more than 14%, preferably more than 15%, which has been demonstrated on manufactured samples.
  • the material characteristic yield strength Rp0.2 and the elongation at break A80 are to be taken as determined according to DIN EN ISO 6892-1:2020-06, for samples taken from the longitudinal direction of the strip.
  • the electrical strip or sheet has values of the core loss values P (1, 0T; 400Hz) ⁇ 13.00 W/kg, preferably P (1, 0T; 400Hz) ⁇ 12.40 W/kg, particularly preferably P (1, 0T; 400Hz) ⁇ 12.30 W/kg.
  • it has core loss values P(1,0T; 2000Hz) ⁇ 150,00 W/kg, preferably P(l,0T; 2000Hz) ⁇ 145,00 W/kg, particularly preferably P(l,0T; 2000Hz) ⁇ 143,00 W/kg.
  • P is a thickness-dependent parameter, it applies to the measured sample as it is presented according to the invention, whereby the thickness of the sample is advantageously between 0.230 mm and 0.270 mm, preferably between 0.235 mm and 0.250 mm.
  • the parameters given were chosen as representative because they are parameters that frequently occur in the performance requirements of manufacturers.
  • the magnetization losses are to be understood in the sense of DIN EN 60404-2:2019-05: Magnetic materials - Part 2: Method for determining the magnetic properties of electrical steel strip and sheet using an Epstein frame".
  • the electrical strip or sheet alternatively or additionally has a magnetic polarization
  • the formula symbol J100;50Hz denotes the magnetic polarization at a magnetic field strength of 100 A/m in an alternating electromagnetic field with 50 Hz.
  • the parameters given were chosen as representative because they are parameters that frequently occur in the performance requirements of manufacturers.
  • Methods for determining polarization and field strength are known to those skilled in the art, for example using an Epstein frame to determine polarization, in particular in accordance with “DIN EN 60404-2:2019-05: Magnetic materials - Part 2: Methods for determining magnetic
  • the polarization applies in particular to the measured sample as it is present according to the invention, wherein the thickness of the sample is advantageously between 0.180 mm and 0.270 mm, preferably between 0.230 mm and 0.270 mm, particularly preferably between 0.235 mm and 0.250 mm.
  • the parameters for polarization are to be understood in this sense.
  • the electrical strip or sheet particularly preferably has a specific electrical resistance of between 0.59 pQm and 0.70 pQm at a temperature of 25 degrees Celsius.
  • these values are obtained at a thickness, preferably at any thickness, between 0.180 mm and 0.270 mm, preferably between 0.230 mm and 0.270 mm, particularly preferably between 0.235 mm and 0.250 mm.
  • a specific electrical resistance with this measure correlates with the good magnetic properties obtained.
  • a further idea of the invention relates to a method for producing a non-grain-oriented electrical steel strip.
  • materials can be produced which have advantages of the type described at the beginning.
  • an electrical steel strip is produced which has a particularly advantageous combination of properties. The following steps are carried out:
  • step (B) cold rolling the electrical steel strip provided in step (A) to a thickness of between 0.180 mm and 0.270 mm;
  • the non-grain-oriented electrical steel strip of greater thickness can be produced using a conventional production route via a continuous casting plant or via thin slab production.
  • a steel melt with a suitable specification for example of the type mentioned at the beginning, is melted to form a starting material and cast to form a starting material, which in conventional production can be a slab or a thin slab.
  • the raw material produced in this way can then be heated to a raw material temperature of, for example, between 1100 and 1300 degrees Celsius. If necessary, the raw material is reheated or kept at the respective target temperature using the casting heat.
  • the precursor material heated in this way can then be hot rolled into a hot strip with a thickness of, for example, between 1.6 mm and 2.2 mm, preferably between 1.8 mm and 2.1 mm.
  • Hot rolling begins, for example, in a manner known per se, at a hot rolling initial temperature in the finishing stage of 900 to 1150 degrees Celsius and ends, for example, with a hot rolling final temperature of 700 to 920 degrees Celsius, in particular 780 to 850 degrees Celsius.
  • the hot strip obtained can then be cooled to a coiling temperature and coiled into a coil.
  • the coiling temperature is ideally chosen so that Problems during the subsequent cold rolling can be avoided.
  • the coiling temperature is, for example, at most 700 degrees Celsius, preferably between 550 and 700 degrees Celsius.
  • the hot strip annealing, preferably carried out after coiling, is preferably carried out at a temperature of 700 to 1000 degrees Celsius.
  • the final annealing is carried out in a continuous furnace.
  • the targeted adjustment of the infeed belt tension and/or the outfeed belt tension during the final annealing is beneficial.
  • the specific infeed belt tension is at most 5 N/mm 2 , preferably at most 2.5 N/mm 2 , particularly preferably at most 2.3 N/mm 2
  • the specific outfeed belt tension is at most 4 N/mm 2 , preferably at most 3.5 N/mm 2 , particularly preferably at most 2.5 N/mm 2 .
  • both conditions are met cumulatively.
  • the specific belt tension results from the quotient of the belt tension, which is a force with the unit Newton, symbol: N, and the cross-section of the belt.
  • the belt tension is a quantity known to those skilled in the art when transporting steel belts, and its measurement and monitoring is a common professional measure when operating belt lines.
  • the measurement can be carried out, for example, using a commercially available force sensor, also known as a strain gauge, with a measuring amplifier.
  • the electrical steel is provided with an infeed roller stand positioned in front of the throughput of the infeed belt, as seen in the direction of belt transport, and with an infeed roller stand positioned in front of the throughput of the infeed belt, as seen in the direction of belt transport, after the The conveyor is transported through the positioned discharge roller frame with the discharge belt train.
  • a high annealing temperature i.e. maximum temperature
  • a high annealing temperature is preferably set which has a value between 1010 degrees Celsius and 1090 degrees Celsius, preferably between 1020 degrees Celsius and 1080 degrees Celsius, particularly preferably between 1030 degrees Celsius and 1070 degrees Celsius.
  • step (C) is carried out with the following parameters:
  • the material is heated at a heating rate of at least 40 K/s to a temperature between 850 degrees Celsius and 950 degrees Celsius , preferably to a temperature between 880 degrees Celsius and 920 degrees Celsius .
  • step ( C2 ) Once the temperature specified in step ( CI ) has been reached, the annealing temperature is increased beyond this temperature at a heating rate of between 5 and 150 K/s. heated.
  • the annealing temperature is the previously introduced and defined temperature.
  • the method is particularly preferably set up in such a way that the high annealing temperature is maintained for a period of between 10 and 90 seconds.
  • the high annealing temperature is maintained in certain furnace zones by, among other things, the furnace length and by the corresponding setting of the belt transport speed.
  • the cold strip is cooled down to room temperature, whereby the cooling of the cold strip preferably takes place down to room temperature at a maximum cooling rate of 25 K/s, i.e. a cooling rate of 25 K/s is not exceeded during the entire cooling process.
  • the controlled cooling serves, among other things, to prevent the formation of undesirable residual stresses in the electrical steel strip, which have detrimental properties on the magnetic behavior of the strip.
  • step (C) preferably takes place in an annealing atmosphere which
  • - consists of at least 60 vol. percent H2, preferably more than 70 vol. percent H2, and/or
  • Tp ⁇ 5 degrees Celsius preferably a dew point of Tp ⁇ 0 degrees Celsius.
  • both conditions are present cumulatively.
  • the electrical steel provided in step (A) is made from a material with the alloy specification specified below, the details being given in weight percent, in short: wt.%:
  • Al 1.40 up to 1.60; Mn: 0.55 to 0.65;
  • Ti up to 0.0070, preferably up to 0.0040;
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • P up to 0.040, preferably up to 0.020;
  • Ti up to 0.0070, preferably up to 0.0040;
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • P up to 0.040, preferably up to 0.020;
  • Ti up to 0.0070, preferably up to 0.0040;
  • the electrical steel strip or sheet showed particularly good properties when the composition of the alloy was as follows:
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • P up to 0.040, preferably up to 0.020;
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • Mn 0.55 to 0.65
  • P up to 0.040, preferably up to 0.020;
  • the electrical steel strip or sheet showed particularly good properties according to a preferred further development, which satisfies the following alloy specification:
  • the cold rolling in step (B) is carried out to a thickness of the cold strip between 0.180 mm and 0.270 mm, preferably to a thickness of the cold strip between 0.230 mm and 0.270 mm, particularly preferably to a thickness between 0.235 mm and 0.250 mm.
  • a further idea of the invention relates to an electrical strip as can be obtained using a method of the aforementioned manner, but is produced using any other method.
  • An electrical strip or an electrical sheet of the type mentioned above or a further development of these is suitable in particular for use in electrical machines.
  • One concept of the invention therefore comprises a cutout punched out of an electrical strip or an electrical tape, which is used as a lamella of a component of an electrical machine, in particular as a component of a stator or a rotor of an electrical machine.
  • a number of several lamellas can be punched out of an electrical strip or an electrical sheet of the type mentioned at the beginning or a development thereof, joined together, for example by gluing with a suitable adhesive, so that the joined lamellas form a stator or a rotor.
  • Strips were produced from alloys with different analyses, namely analyses A, B and C. The analyses are listed in Table 2.
  • Non-grain-oriented electrical steel was prepared from the corresponding analyses.
  • a cold rolled strip with the specified thickness was finally annealed and then cooled.
  • final annealing was carried out at a final annealing temperature as given in column "SG" of Table 1 for a annealing period of between 10 and 90 seconds (see column t of Table 1 where the annealing period is given in seconds).
  • a final annealing temperature as given in column "SG" of Table 1 for a annealing period of between 10 and 90 seconds (see column t of Table 1 where the annealing period is given in seconds).
  • different infeed belt tensions and outfeed belt tensions were used, which are also given in the corresponding columns of Table 1.
  • Table 1 lists: The core losses P were determined using an Epstein frame, in accordance with DIN EN 60404-2:2019-05: "Magnetic materials - Part 2: Methods for determining the magnetic properties of electrical steel strip and sheet using an Epstein frame". Electrical steel sheets were cut into longitudinal and transverse strips and measured as a mixed sample in the Epstein frame. The magnetic values P, core losses, were determined at 1.0 T for 400 Hz and 2000 Hz respectively. The magnetic values J, polarization, were determined at 50 Hz and 100 A/m and 2500 A/m respectively using an Epstein frame, in particular according to DIN EN 60404- 2:2019-05: "Magnetic materials - Part 2: Methods for determining the magnetic properties of electrical steel strip and sheet using an Epstein frame". The corresponding electrical sheets were cut into longitudinal and transverse strips and measured as a mixed sample in the Epstein frame.
  • the material properties yield strength Rp0.2, tensile strength Rm and elongation at break A80 were determined according to DIN EN ISO 6892-1:2020-06 using samples in the longitudinal direction of the strip.
  • the samples can be classified.
  • the result provides a picture according to which samples with small thicknesses and sufficient yield strength Rp0.2 can be obtained by classifying systematic property profiles depending on the composition of the starting alloy.
  • samples 3, 4, 5 and 6 remain as samples according to the invention.
  • samples classified according to the invention can be produced using the method according to the invention, while a method not according to the invention produces samples not according to the invention.

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Abstract

L'invention concerne une bande ou feuille électrique métallique à grains orientés qui est caractérisée, en plus de sa composition d'alliage, par une épaisseur < 0 270 mm et une limite d'élasticité conventionnelle à 0,2 % Rp0, 2 > 420 MPa. Un autre aspect de l'invention concerne un procédé de production d'une bande électrique à grains non orientés et une utilisation.
PCT/EP2024/062237 2023-07-04 2024-05-03 Bande ou feuille électrique métallique à grains non orientés, procédé de production d'une bande électrique à grains non orientés et utilisation Ceased WO2025008095A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202480044571.7A CN121420079A (zh) 2023-07-04 2024-05-03 无晶粒取向金属电工带或电工板、用于制造无晶粒取向金属电工带的方法及用途
KR1020257043139A KR20260013997A (ko) 2023-07-04 2024-05-03 무방향성 금속 전기 스트립 또는 시트, 무방향성 전기 스트립을 제조하기 위한 방법 및 용도
MX2025015254A MX2025015254A (es) 2023-07-04 2025-12-16 Tira o lamina metalica electrica sin orientacion de grano, metodo para producir tiras electricas sin orientacion de grano y uso

Applications Claiming Priority (2)

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DE102023117593 2023-07-04
DE102023117593.9 2023-07-04

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WO2025008095A1 true WO2025008095A1 (fr) 2025-01-09

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PCT/EP2024/062237 Ceased WO2025008095A1 (fr) 2023-07-04 2024-05-03 Bande ou feuille électrique métallique à grains non orientés, procédé de production d'une bande électrique à grains non orientés et utilisation

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KR (1) KR20260013997A (fr)
CN (1) CN121420079A (fr)
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005240095A (ja) * 2004-02-26 2005-09-08 Jfe Steel Kk スイッチトリラクタンス（ｓｒ）モータ用無方向性電磁鋼板およびその製造方法
WO2020094230A1 (fr) * 2018-11-08 2020-05-14 Thyssenkrupp Steel Europe Ag Bande ou tôle électrique pour applications de moteur électrique haute fréquence présentant une polarisation améliorée et de faibles pertes par inversion magnétique
WO2023282071A1 (fr) * 2021-07-05 2023-01-12 Ｊｆｅスチール株式会社 Tôle d'acier électromagnétique non orientée et son procédé de fabrication
WO2023121200A1 (fr) * 2021-12-21 2023-06-29 주식회사 포스코 Feuille d'acier électrique non orientée et son procédé de fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005240095A (ja) * 2004-02-26 2005-09-08 Jfe Steel Kk スイッチトリラクタンス（ｓｒ）モータ用無方向性電磁鋼板およびその製造方法
WO2020094230A1 (fr) * 2018-11-08 2020-05-14 Thyssenkrupp Steel Europe Ag Bande ou tôle électrique pour applications de moteur électrique haute fréquence présentant une polarisation améliorée et de faibles pertes par inversion magnétique
WO2023282071A1 (fr) * 2021-07-05 2023-01-12 Ｊｆｅスチール株式会社 Tôle d'acier électromagnétique non orientée et son procédé de fabrication
EP4365318A1 (fr) * 2021-07-05 2024-05-08 JFE Steel Corporation Tôle d'acier électromagnétique non orientée et son procédé de fabrication
WO2023121200A1 (fr) * 2021-12-21 2023-06-29 주식회사 포스코 Feuille d'acier électrique non orientée et son procédé de fabrication

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KR20260013997A (ko) 2026-01-29
MX2025015254A (es) 2026-02-03

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