EP3746574A1 - Feuillard magnétique apte à être repassé au recuit, mais non tenu d'être repassé au recuit - Google Patents

Feuillard magnétique apte à être repassé au recuit, mais non tenu d'être repassé au recuit

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Publication number
EP3746574A1
EP3746574A1 EP19701626.4A EP19701626A EP3746574A1 EP 3746574 A1 EP3746574 A1 EP 3746574A1 EP 19701626 A EP19701626 A EP 19701626A EP 3746574 A1 EP3746574 A1 EP 3746574A1
Authority
EP
European Patent Office
Prior art keywords
grain
electrical steel
oriented electrical
steel strip
strip
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.)
Pending
Application number
EP19701626.4A
Other languages
German (de)
English (en)
Inventor
Sebastian Sieron
Philipp SZARY
Olaf Fischer
Abdullah KAHVECI
Karl Telger
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
ThyssenKrupp AG
Original Assignee
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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 ThyssenKrupp Steel Europe AG, ThyssenKrupp AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP3746574A1 publication Critical patent/EP3746574A1/fr
Pending 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/1261—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
    • C21D8/1244—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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • 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
    • 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
    • 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
    • C21D2201/00—Treatment for obtaining particular effects
    • C21D2201/05—Grain orientation

Definitions

  • the invention relates to a non-grain oriented electrical steel or sheet, in particular for electrotechnical applications, a made of such electrical steel or sheet electrical component, a method for producing an electrical tape or sheet and the use of such electrical tape or sheet in components for electrotechnical applications.
  • Typical uses of such sheets are electric motors and generators, in particular in the stator or in the rotor.
  • the non-grain-oriented electrical tapes used in the stator and in the rotor of a high-frequency electrical machine, in particular a motor or generator, preferably have different mechanical and magnetic properties.
  • the rotor core of an electrical machine is preferably made of a material which has markedly increased mechanical properties, whereas the stator should have increased magnetic properties. Improving the magnetic properties in a material generally negatively affects the mechanical properties of the material, and vice versa. Therefore, in the manufacture of electric machines for either rotor and stator, a material is chosen which represents a compromise between mechanical and magnetic properties, or for rotor and stator two different Elektra bands must be used.
  • EP 2 612 942 discloses a non-grain-oriented electrical steel strip or sheet comprising, in addition to iron and unavoidable impurities, 1, 0 to 4.5% by weight of Si, up to 2.0% by weight of Al, up to 1, 0 wt .-% Mn, up to 0.01 wt .-% C, up to 0.01 wt .-% N, up to 0.012 wt .-% S, 0, 1 to 0.5 wt.% Ti and 0, 1 to 0.3 wt .-% P, wherein for the ratio content Ti / content P, each in wt .-%, 1.0 ⁇ content of Ti / content P ⁇ 2.0 applies.
  • the non-grain-oriented electrical steel or sheet and manufactured from such a sheet or strip components for electrical applications are characterized by good magne tables properties.
  • the NO electrical steel strip or sheet is produced by cold-rolling a hot strip consisting of a steel with the above-mentioned composition to a cold strip and subsequently subjecting this cold strip to a final annealing.
  • EP 2 840 157 discloses a non-grain oriented electrical steel or sheet, in particular for electrotechnical applications made of a steel containing, besides iron and unavoidable impurities, 2.0 to 4.5% by weight of Si, 0.03 to 0.3 Wt% Si, up to 2.0 wt% Al, up to 1.0 wt% Mn, up to 0.01 wt% C, up to 0.01 wt% N , up to 0.001% by weight of S and up to 0.015% by weight of P, ternary Fe-Si-Zr precipitates being present in the microstructure of the electrical steel strip or sheet.
  • EP 2 840 157 also discloses a method of manufacturing such electrical tapes and sheets which includes a final anneal.
  • WO 00/65103 A2 discloses a process for producing non-grain oriented electrical steel in which a steel pre-material containing less than 0.06 wt% C, 0.03 to 2.5 wt% Si, less than 0.4 Wt .-% Al, 0.05 to 1 wt .-% Mn and less than 0.02 wt .-% S, is hot rolled to a hot strip with a thickness of less than 3.5 mm, then pickled and after pickling is rolled to a cold strip having a thickness of 0.2 to 1 mm.
  • the invention is thus based on the object to provide a non-grain-oriented electrical steel or sheet, which can be used in electrical machines, in particular electric motors or generators, both as a rotor with improved mechanical properties and as a stator with improved magnetic properties, said different, intrinsically opposing properties, easy to be converted into each other.
  • a non-grain-oriented electrical steel or sheet containing in addition to iron and unavoidable impurities (in each case in wt .-%) up to 0.0040 C, 0, 1500 to 0.3000 Mn, 2.300 to 2.700 Si, 0 , 3000 to 0.8000 AI, up to 0.0400 P, up to 0.0035 S, up to 0.0070 N and up to 0.0070 Ti, wherein the ratio of magnetization loss Pi , 0/50 in the final annealed to stand to Correction loss Pi 0/50 in the reference annealed condition is at least 1.50.
  • reference annealing of the non-grain oriented electrical strip according to the invention is understood to mean the annealing of the non-grain oriented electrical strip or sheet according to the invention at the end of the production process, corresponding to the optional step (D) of the process described below, at a temperature of 600 up to 1000 ° C.
  • the "reference-annealed state” is thus the state of the non-grain-oriented electrical strip or sheet according to the invention after annealing at a temperature of 600 to 1000 ° C.
  • the objects are further achieved by a method for producing the non-grain-oriented electrical strip or sheet according to the invention, by a component for electrical applications, manufactured from such an electrical steel and by the use of electrical tape in components for electrical applications.
  • the non-grain-oriented electrical steel according to the invention is made of a steel which, in addition to iron and unavoidable impurities (data in% by weight) up to 0.0040 C,
  • the non-grain oriented electrical steel according to the invention is made of a steel Herge, in addition to iron and unavoidable impurities (in each case in wt .-%)
  • the amounts of the individual elements contained in the steel preferably used according to the invention are determined by methods known in the art, for example by a chemical analysis according to DIN EN 10351: 2011-05 "Chemical analysis of ferrous materials - Analysis of unalloyed and low-alloyed steels by means of optical emission spectrometry with inductively coupled piasma.
  • the inventors of the present invention have found that a non-grain oriented electrical tape can be provided which can be used in electric machines, particularly electric motors and generators, both as a stator with good magnetic properties and as a rotor with good mechanical properties the change of properties is achieved by a reference annealing of the material obtained after the final annealing.
  • a non-grain-oriented electrical steel can be obtained according to the invention, which has improved magnetic properties in comparison to the finally annealed material, in particular the magnetization losses P are markedly reduced at different polarizations and / or frequencies.
  • This property of the material according to the invention is expressed by the fact that the ratio of magnetization loss Pi 0/50 in the finally annealed state to magnetization loss Pi 0/50 in the referenced annealed state is at least 1.30 , ie, that the magnetization loss Pi 0/50 in the referenced annealed state becomes clear is degraded.
  • the grain-oriented electrical steel according to the invention in the finally annealed state has improved mechanical properties compared to the reference-annealed state.
  • the non-grain-oriented electrical steel strip or sheet according to the invention has good mechanical properties in the final annealed state and good magnetic properties in the reference-annealed state.
  • the non-grain-oriented electrical steel according to the invention compared with a uniform material for rotor and stator, a significant increase in the efficiency of electrical machines is achieved since a material can be provided for the rotor and stator which has either improved mechanical or improved magnetic properties.
  • the present invention relates to the non-grain-oriented electrical strip or sheet according to the invention, wherein it has very low, specific grain sizes in the finally annealed state, for example, in this case a particle size of 50 to 130 pm, preferably 70 to 100 pm before.
  • the present invention therefore preferably relates to the invention non-kornorien oriented electrical steel, wherein it has a particle size of 50 to 130 pm, preferably 70 to 100 pm in the final annealed state.
  • the grain size can be determined by any method known to those skilled in the art, for example by microstructural examination by means of light microscopy according to ASTM El 12 "Standard Test Methods for Determining Average Grain Size".
  • the non-grain-oriented electrical steel strip or sheet according to the invention has an advantageous ratio of reversal losses P in the finally annealed state to reversal losses P in the re-annealed state.
  • a skin pass (rolling step) also understood a "semifinished” state.
  • the designation Pi 0/50 means the magnetic reversal loss P at a polarization of 1.0 T and a frequency of 50 Hz.
  • the magnetic reversal losses P can according to the invention, for example by means of an Epstein frame, in particular according to DIN EN 60404-2: 2009-01: Magnetic materials - Part 2: Method for determining the magnetic properties of electrical steel strip and sheet using an Epstein frame.
  • corresponding electrical sheets in longitudinal (L), transverse (Q) or in a combination of the two (mixed alignment (M)) are measured.
  • the values for the mixed alignment (M) are given in each case.
  • the ratio of magnetization loss Pi 0/50 in the final annealed state to magnetization loss Pi 0/50 in the referenced state is at least 1.30 , preferably at least 1.32, particularly preferably at least 1.60.
  • An upper limit for this ratio is for example 2.50.
  • the ratio of core loss Pi 5/50 in the final annealed state to magnetization loss Pi 5/50 in the referenced state is preferably at least 1.10 , more preferably at least 1.20, most preferably at least 1.60 , An upper limit for this ratio is 2.0, for example.
  • the ratio of core loss RI , OMOO in the finally annealed state to magnetization loss Pi , 0/400 in the referenced state is at least 1.10, particularly preferably at least 1.15, very particularly preferably at least 1, 20th
  • An upper limit for this ratio is, for example, 1.60.
  • the ratio of yield strength Rp 0 2 in the final annealed state to yield point Rp 0 2 in the referenced state is preferably at least 1.05, more preferably at least 1.10, most preferably at least 1.15
  • the upper limit for this ratio is 1.40.
  • non-oriented electrical steel strip or sheet is preferably that behaves nis tensile strength R m in the processed state to tensile strength R m in the state referenzgeglühten least 1 min, 01, particularly preferably at least 1, 05th
  • An upper limit for this ratio is example, 1.30.
  • An upper limit for this ratio is for example 1, 10.
  • J2500 / 50 means the polarization at a field strength of 2500 A / m and a frequency of 50 Hz.
  • the non-grain oriented electrical steel strip or sheet according to the invention has an advantageous higher specific electrical resistance to grain-oriented electrical strips according to the prior art.
  • Methods for determining the specific electrical resistance are known per se to the person skilled in the art, for example by means of a four-point measurement according to DIN EN 60404-13: 2008-05 "Magnetic Materials - Part 13: Testing the Measurement of Density, Resistivity and Sta pel compositions of Electric sheet and tape ".
  • the non-grain oriented electrical steel strip or sheet of the present invention may be present in all thicknesses suitable for electrical engineering applications.
  • the electrical strip or sheet is present in particularly low thicknesses, since at these low thicknesses the gantry losses are lower than at higher thicknesses.
  • the electrical steel strip or sheet according to the invention is present in a thickness of preferably 0.26 to 0.38 mm, each with a deviation of up to 8%.
  • the non-grain-oriented electrical strip or sheet according to the invention preferably has a tensile strength Rm of 400 to 600 N / mm 2
  • the non-grain oriented electrical strip or sheet according to the invention in the final annealed state preferably has a tensile strength R m of 480 to 600 N / mm 2
  • im Renzglgten state preferably has a tensile strength Rm of 400 to 520 N / mm 2
  • the test is carried out in the longitudinal direction of the material, ie. in the rolling direction of the electrical tape. This is generally the worse direction of tensile strength due to any anisotropy in the material.
  • the tensile strength is determined according to the invention by the method known to those skilled in, for example tensile test according to DIN EN ISO 6892-1: 2017-02 "Metallic materials - Tensile tests - Part 1: Test method at room temperature" determined.
  • the non-grain-oriented electrical steel or sheet according to the invention preferably has a yield strength Rp 0 2 of 300 to 440 N / mm 2
  • the non-grain oriented electrical strip or sheet according to the invention in the final annealed state preferably has a yield strength Rp 0 2 of 400 to 440 N / mm 2 and in the referengeglühten state has a yield strength Rp 0 2 from 300 to 400 N / mm 2
  • the yield strength according to the invention by methods known in the art, for example tensile test according to DIN EN ISO 6892-1: 2017-02 "Metallic materials - Tensile tests - Part 1: Test method at room temperature”.
  • the non-grain-oriented electrical steel according to the invention is characterized in that it has particularly advantageous mechanical characteristics in the finally annealed state and can be converted into a material by a reference glow, which has particularly advantageous magnetic properties.
  • this material can be used in electric machines, in particular electric motors or generators, both as a stator and as a rotor, which in turn results in the above-mentioned parts before.
  • the present invention also relates to a method for producing a non-grain-oriented electrical strip or sheet according to the invention, comprising at least the following method steps:
  • step (C) heat treating the cold strip from step (B) to obtain a non-grain oriented electrical steel strip.
  • a hot strip composed in the manner explained above for the non-grain-oriented electrical steel strip or strip is first provided, which is subsequently cold-rolled and subjected to heat treatment as a cold-rolled strip (step (C), also called final annealing.)
  • step (C ) of the method according to the invention a non-grain-oriented electrical steel is obtained, which is ready for use in electrical machines and characterized by a stress-free state combined with above average mechanical properties in comparison to non-grain-oriented electrical grades of the prior art. Due to the fine grain structure also achieved a possible damage by a separation process such as cutting, punching or laser cutting is less than in non-grain oriented electrical steel grades of the prior art.
  • the non-grain-oriented electrical steel obtained after step (C) of the process according to the invention can be subjected to a further heat treatment step (D), the so-called "reference annealing".
  • a further heat treatment step (D) the so-called "reference annealing”.
  • the present invention therefore preferably relates to the process according to the invention, wherein after step
  • step (C) the following step (D) is performed:
  • step (D) Reference annealing the non-grain oriented electrical tape of step (C) at a temperature of 600 to 1000 ° C.
  • Step (A) of the process according to the invention comprises providing a hot strip comprising, in addition to iron and unavoidable impurities (in each case in% by weight) up to 0.0040 C, 0, 1500 to 0.3000 Mn, 2.300 to 2.700 Si, 0, 3000 to 0.8000 AI, up to 0.0400P, up to 0.0035S, up to 0.0070N and up to 0.0070Ti. Preferred amounts are given above.
  • the manufacture of the hot strip provided according to the invention can be carried out conventionally as far as possible.
  • a molten steel with a composition according to the invention corre sponding composition initially be melted and cast into a starting material, which may be a slab or thin slab in conventional manufacturing.
  • the starting material thus produced can then be brought to a 1020 to 1300 ° C amount Vormaterialtempe temperature.
  • the starting material is reheated, if necessary, or kept under Ausnut tion of the casting heat at the respective target temperature.
  • the thus heated starting material can then be hot rolled to a hot strip having a thickness which is typically 1.5 to 4 mm, in particular 1.5 to 3 mm.
  • the hot rolling begins in a conventional manner at a hot rolling start temperature in the finishing scale of higher than 900 ° C, for example 1000 to 1150 ° C, and ends with a hot rolling end temperature of below 900 ° C, for example 700 to 920 ° C, especially 780 to 850 ° C.
  • the resulting hot strip can then be cooled to a coiling temperature and coiled into a coil.
  • the reel temperature is ideally chosen so that problems are avoided when performed on closing cold rolling. In practice, the reel temperature for this purpose, for example, at most 700 ° C.
  • annealing may be performed after hot rolling or before cold rolling. This annealing step is carried out, for example, at a temperature of 600 to 900 ° C.
  • a cleaning step may optionally be carried out by pickling.
  • Corresponding methods are known per se to the person skilled in the art.
  • Step (B) of the process of the invention comprises cold rolling the hot strip to a cold strip.
  • the supplied hot strip is cold rolled to a cold strip having a thickness which is typically the thickness of the electrical strip or sheet of the present invention, i. preferably 0.26 to 0.38 mm, each with a deviation of up to 8% corresponds.
  • the method and procedure of cold rolling are known per se to the person skilled in the art.
  • the material thickness decrease of the first stitch is not more than 35%. More preferably, the material decrease in the last stitch is not more than 20%.
  • Step (C) of the process of the invention comprises heat treating the cold strip from step (B) to obtain a non-grain oriented electrical steel strip.
  • step (C) of the process according to the invention is carried out as a continuous process.
  • Corresponding devices ie. Furnaces in which the cold strip from step (B) of the method according to the invention can be heat-treated continuously are known per se to those skilled in the art.
  • the heat treatment in step (C) of the process according to the invention is preferably carried out at a temperature of from 750 to 1000.degree. C., more preferably at from 750 to 950.degree.
  • the process speed at said temperature is preferably 60 to 100 m / min.
  • the non-grain-oriented electrical steel obtained is preferably cooled to ambient temperature and, if so desired to be coated on the surface with a varnish.
  • Corresponding methods and paints are known per se to the person skilled in the art.
  • the non-grain oriented electrical steel strip or sheet obtained after step (C) can be advantageously used in electric machines.
  • the present invention preferably relates to the process according to the invention, the following step (D) being carried out after step (C):
  • step (D) Reference annealing the non-grain oriented electrical tape of step (C) at a temperature of 600 to 1000 ° C.
  • Step (D) of the method according to the invention (“reference annealing") is carried out when an inventive electrical steel or sheet is to be obtained, which has particularly advantageous magnetic properties, which in turn can be preferably used as a stator in an electric machine.
  • Step (D) of the process according to the invention is preferably carried out on components which have been divided off from the non-grain-oriented electrical steel obtained in step (C). From the non-grain oriented electrical steel obtained in step (C), parts are preferably divided by punching or cutting, which are to be used as a stator in electric machines. Methods for this purpose are known per se to the person skilled in the art, for example punching, laser beam cutting, water jet cutting, wire EDM.
  • the optional step (D) of the method according to the invention can according to the invention take place on the components per se, it is also possible according to the invention that the individual components are assembled into packages and then treated in step (D) who the.
  • the optional step (D) of the process according to the invention comprises annealing at a temperature of 600 to 1000 ° C, preferably 700 to 900 ° C, more preferably 750 to 850 ° C. According to the invention, the temperatures mentioned during in step (C) by up to 20 ° C upwards and down to 15 ° C downwards.
  • the heating rate is preferably at least 100 ° C./h.
  • the holding time at the final temperature is in this step according to the invention before given to at least 20 min.
  • step (D) may be carried out in any manner known to those skilled in the art.
  • step (D) is carried out according to the invention in a stationary furnace. It is also possible to carry out step (D) in a continuous annealing process which is known per se to a person skilled in the art.
  • the present invention also relates to a component for electrical applications, made of egg nem electrical steel or sheet according to the invention, preferably with a theoretical density of 7.55 to 7.67 kg / cm 3 .
  • components for electrical applications are electric motors, generators or transformers, in particular rotors or stators, which preferably represent basic components of an electrical machine, with which one can make an energy conversion, in particular electrical energy into mechanical or mechanical energy into electrical.
  • the present invention further relates to the use of a Elektra bands or sheets according to the invention in components for electrical applications, in particular in electric motors, generators or transformers, in particular rotors or stators, which are preferably Grundkompo components of an electrical machine with which one energy conversion, in particular, can make electrical energy into mechanical or mechanical energy into electrical energy.
  • the base material used is silicon steels having the compositions according to Table 1.
  • Hot-rolled strips are produced from these steels.
  • the hot rolling temperature is 830 ° C.
  • cold rolling is carried out to a thickness of 2.4 mm.
  • Ri i0 / 50 , Rp0,2 and Rm determined. The values are shown in Table 2.
  • Rp0.2 describes the yield strength of the material and is determined in accordance with DIN EN ISO 6892-1: 2017-02 "Metallic materials - Tensile tests - Part 1: Test method at room temperature”.
  • the value Rm describes the tensile strength of the material and is determined in accordance with DIN EN ISO 6892-1: 2017-02 "Metallic materials - Tensile tests - Part 1: Test method at room temperature”.
  • the polarization is determined according to DIN EN 60404-2: 2009-01 "Magnetic Materials - Part 2: Method for Determining the Magnetic Properties of Electrical Steel and Sheet Using an Epsteinrah".
  • the loss P is determined according to DIN EN 60404-2: 2009-01 "Magnetic Materials - Part 2: Method for Determining the Magnetic Properties of Electrical Steel and Sheet Using an Epstein Frame".
  • the non-grain-oriented electrical strip or sheet according to the invention can preferably be used in electric motors, in particular for use in electric vehicles, or in generators.

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  • Chemical & Material Sciences (AREA)
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  • Dispersion Chemistry (AREA)
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  • Soft Magnetic Materials (AREA)

Abstract

L'invention concerne un feuillard magnétique ou une tôle magnétique à grains non orientés, en particulier destiné(e) à des applications électrotechniques, un composant électrotechnique fabriqué à partir d'un tel feuillard magnétique ou d'une telle tôle magnétique, un procédé de fabrication d'un feuillard magnétique ou d'une tôle magnétique et l'utilisation d'un tel feuillard magnétique ou d'une telle tôle magnétique dans des composants destinés à des applications électrotechniques.
EP19701626.4A 2018-02-02 2019-01-23 Feuillard magnétique apte à être repassé au recuit, mais non tenu d'être repassé au recuit Pending EP3746574A1 (fr)

Applications Claiming Priority (2)

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DE102018201622.4A DE102018201622A1 (de) 2018-02-02 2018-02-02 Nachglühfähiges, aber nicht nachglühpflichtiges Elektroband
PCT/EP2019/051614 WO2019149593A1 (fr) 2018-02-02 2019-01-23 Feuillard magnétique apte à être repassé au recuit, mais non tenu d'être repassé au recuit

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DE (1) DE102018201622A1 (fr)
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DE102018201618A1 (de) * 2018-02-02 2019-08-08 Thyssenkrupp Ag Nachglühfähiges, aber nicht nachglühpflichtiges Elektroband
DE102020130987A1 (de) 2020-01-24 2021-07-29 Schaeffler Technologies AG & Co. KG Verfahren zur Herstellung eines Bauteils eines Elektromotors, Elektromotorbauteil und Elektromotor
DE102020113047A1 (de) 2020-05-14 2021-11-18 Schaeffler Technologies AG & Co. KG Elektromotorbauteil und Verfahren zur Herstellung eines Elektromotorbauteils eines Axialflussmotors
DE102022116250A1 (de) 2022-06-29 2024-01-04 Thyssenkrupp Steel Europe Ag Hocheffiziente Kompressor-Motoren

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Publication number Publication date
WO2019149593A1 (fr) 2019-08-08
US20210079493A1 (en) 2021-03-18
CN111699270A (zh) 2020-09-22
MX2020008081A (es) 2020-09-24
US11788168B2 (en) 2023-10-17
DE102018201622A1 (de) 2019-08-08

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