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
  • C21D8/1272—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
  • C21D8/1216—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
• • 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
  • 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
  • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• • 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
  • H01F1/16—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
  • 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

Definitions

• the invention relates to a non-grain-oriented electrical steel or sheet, in particular for electrical applications, a manufactured from such an electrical steel strip or sheet electrical component, a method for producing an electrical tape or sheet and the use of such an electrical tape or sheet in components for electrical engineering applications.
• Typical uses of such sheets are electric motors and generators. Electric motors, especially when used in electromobility, are operated at higher speeds, coupled to the associated higher frequencies. The losses occurring at these high frequencies are not comparable to the losses occurring at 50 Hz.
• the Ummagnetleitershuse over the entire speed range, which in turn is frequency-dependent, the electric motor should be as low as possible.
• the mechanical characteristics of the electrical steel strips and sheets should be improved compared to the materials known from the prior art, in particular less negative influences on the soft magnetic properties resulting from the stamping process.
• EP 2 612 942 discloses a non-grain-oriented electrical steel sheet 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 components made of such a metal sheet or strip for electrical applications are characterized by increased strength and at the same time good magnetic properties.
• the NO electrical steel strip or sheet is produced by cold-rolling a hot strip consisting of a steel with the aforementioned composition into a cold strip and then subjecting this cold strip to a final annealing.
• the polarizability at low frequencies and the mechanical properties of the electrical tapes or sheets according to EP 2 612 942 are still to be improved.
• EP 2 840 157 discloses a non-grain oriented electrical steel or sheet, in particular for electrotechnical applications, made of a steel containing, in addition to iron and unavoidable impurities, 2.0 to 4.5% by weight of Si, 0.03 to 0.3% by weight % Si, up to 2.0% by weight Al, up to 1.0% by weight Mn, up to 0.01% by weight C, up to 0.01% by weight N, up to 0.001 wt.% S and up to 0.015 wt.% 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 for producing such electrical tapes and sheets which includes a finish annealing. The polarizability at low field strengths and the mechanical properties of the electrical tape according to EP 2 840 157 are still to be improved.
• WO 00/65103 A2 discloses a process for the production of non-grain-oriented electrical sheet in which a steel prematerial containing less than 0.06% by weight of C, 0.03 to 2.5% by weight of 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 the pickling is rolled into a cold strip having a thickness of 0.2 to 1 mm.
• the mechanical and magnetic properties of the electrical steel according to WO 00/65103 A2 can also be improved.
• the invention is therefore based on the object to provide electrical steel bands and sheets, which allow for use in electric motors, which can be used preferably in electric vehicles, even at low field strengths high polarization, so that when starting with the electric vehicles and at low speeds high torque is required. Furthermore, it is also necessary that over the entire used speed range of the electric motor, a high polarization is achieved both in the lower and in the higher field strength range. Furthermore, the Ummagnetleiters- losses when changing the speed of the electric motor should be as low as possible.
• the mechanical characteristics of the electrical steel strips and sheets should be improved compared to the materials known from the prior art, in particular less negative influences on the soft magnetic properties resulting from the stamping process.
• a non-grain-oriented electrical steel or sheet in particular for electrical applications, wherein the ratio of polarization at a field strength of 100 A / m J 10 o to the polarization at a field strength of 2500 A / m J25oo> each measured at 50 Hz, at least 0.5, the electrical steel or sheet has a thickness of at most 0.35 mm and the electrical resistivity is 0.40 to 0.70 ⁇ at a temperature of 50 ° C, by a non-grain oriented electrical steel or sheet produced, preferably produced, in a method comprising a final annealing at a temperature of 950 to 1100 ° C for a maximum of 90 s, by a method for producing the non-grain oriented electrical strip or sheet according to the invention, comprising at least the following method steps : Providing a hot strip that consists of a steel, in addition to iron and unavoidable impurities 2.3 b is 3.40% by weight of Si, 0.3 to 1.1% by weight of
• a non-grain-oriented electrical steel strip or sheet obtained according to the invention, in particular for electrotechnical applications, is preferably made of a steel which has 2.30 to 3.40 wt.%, Preferably 3.00 to 3.40 wt. 0.30 to 1, 10 wt .-%, preferably 0.60 to 1, 10 wt .-%, Al, 0.07 to 0.25 wt .-%, preferably 0.07 to 0, 17 wt. %, Mn, up to 0.030 wt .-%, P, and the remainder iron and unavoidable impurities with a preferably resulting therefrom resulting electrical resistivity of 0.40 to 0.70 ⁇ , more preferably 0.42 to 0.65 ⁇ at a temperature of 50 ° C.
• the amounts of the individual elements contained in the steel preferably used according to the invention are determined by methods known to those skilled in the art, for example by a chemical analysis according to DIN EN 10351: 2011-05 "Chemical analysis of iron materials - Analysis of unalloyed and low-alloyed steels by means of optical emission Inductively coupled plasma spectrometry.
• P is present in an amount of up to 0.030% by weight, preferably P is present in at least 0.005% by weight.
• Possible impurities in the context of this invention are selected from the group consisting of C, S, Ti, N and mixtures thereof.
• the sum of the amounts of any impurities present in the group mentioned should not exceed 100 ppm.
• the inventors of the present invention have found that the requirements for an electrical steel strip or sheet at a frequency of 50 Hz can not be compared with those at higher frequencies. Therefore, the electrical strip or sheet according to the invention and a method for its production have been developed, which brings particular advantages for frequency range of 400 - 1000 Hz, so as to achieve the objects of the invention.
• the present invention relates to the non-grain oriented electrical steel strip or sheet of the present invention having very low specific grain sizes. Particularly preferred is in the electrical steel strip or sheet according to the invention a particle size of 50 to 130 ⁇ , preferably 70 to 100 ⁇ ago.
• the grain size of the electrical strip or sheet according to the invention can be determined by all methods known to the person 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 electrical steel or sheet metal according to the invention has the property that, on the one hand, the influence of the cold forming on the punching edges is less pronounced during the processing of the bands or sheets by punching, so that the use of the strips or sheets is possible no further process steps for processing the punch edges are necessary.
• the bands or sheets according to the invention have due to the low grain diameter particularly good soft magnetic properties, for example, the magnetic properties are disturbed only in a very narrow strip directly to the punching edges. This property of the electrical tapes or sheets according to the invention is particularly advantageous for very narrow webs in electric motors.
• the non-grain-oriented electrical steel strip or sheet according to the invention furthermore has particularly low remagnetization losses P.
• the term P li5 / 5 o means, for example, the magnetization loss P at a polarization of 1.5 T and a frequency of 50 Hz.
• the magnetic reversal losses P can be determined according to the invention by all methods known to the person skilled in the art, in particular 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 ". Q) or mixed alignment (M).
• the electrical tapes or sheets according to the invention have the following core losses, in each case values for the mixed alignment (M):
• the electrical bands or sheets according to the invention have particularly low losses both at low and at high frequencies.
• This advantage according to the invention is particularly advantageous when using the electrical tapes or sheets in electric motors for electric vehicles, since the losses should be as low as possible over the entire speed range when driving.
• the ratio ⁇ , ⁇ ⁇ / 1.5 / 50 is also 5.0 to 10.0, preferably 5.7 to 8.0.
• the non-grain-oriented electrical steel strip or sheet according to the invention furthermore has a higher specific electrical resistance.
• 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: Test for Measurement of Density, Resistivity and Stacking Factor of Electrical Sheet and Strip ".
• the non-grain-oriented electrical steel strip or sheet according to the invention has a specific electrical resistance at 0.40 to 0.70 ⁇ , preferably 0.52 to 0.67 ⁇ , each at a temperature of 50 ° C, on.
• the non-grain-oriented electrical strip or sheet according to the invention is characterized in that the ratio of the polarization at a field strength of 100 A / m J 10 o to the polarization at a field strength of 2500 A / m J 2 5oo, measured at 50 Hz, at least 0.50, preferably at least 0.53, particularly preferably at least 0.55.
• This ratio describes that the polarization is already at a low field strength of 100 A / m at least 50%, preferably at least 53%, more preferably at least 55%, the polarization at a high field strength of 2500 A / m.
• the present invention furthermore preferably relates to the non-grain-oriented electrical strip or sheet according to the invention, wherein the ratio of the polarization at a field strength of 100 A / m J 10 o to the polarization at a field strength of 200 A / m J 20 o, each measured at 50 Hz, 0.59 to 1.0.
• This ratio means that the electrical strip or sheet according to the invention already at a field strength of 100 A / m has 59 to 100% of the polarization which it has at a field strength of 200 A / m.
• the electrical strip or sheet according to the invention is present in a thickness of at most 0.35 mm.
• the present invention preferably relates to the non-grain-oriented electrical steel strip or sheet according to the invention, wherein it has a thickness of 0.24 to 0.33 mm, particularly preferably 0.25 to 0.32 mm, very particularly preferably 0.26 to 0.31 mm , each with a deviation of up to 8%.
• the electrical strip or sheet is present in particularly low thicknesses, since at these low thicknesses the magnetization losses are lower than at higher thicknesses.
• the non-grain-oriented electrical steel strip or sheet according to the invention preferably has a tensile strength of> 480 N / mm 2 , preferably> 530 N / mm 2 .
• the test is carried out in the longitudinal direction of the material, ie in the rolling direction of the electrical steel, this is generally the worse direction for the tensile strength due to possibly existing anisotropy in the material.
• the tensile strength is determined according to the invention by methods known to the person skilled 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 present invention relates to the inventive non-grain oriented electrical steel or sheet, wherein the tensile strength Rm is 450 to 600 N / mm 2 .
• the non-grain-oriented electrical steel strip or sheet according to the invention preferably has a yield strength of> 350 N / mm 2 , preferably> 400 N / mm 2 .
• the yield strength is determined according to the invention by methods known to the person skilled 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 present invention particularly preferably relates to the non-grain-oriented electrical steel strip or sheet according to the invention, wherein the yield strength Rp0.2 is from 330 to 480 N / mm 2 .
• the present invention relates to the non-grain-oriented electrical strip or sheet according to the invention, wherein the breaking elongation A80 has a value of 10 to 30.
• the present invention relates to the non-grain-oriented electrical strip or sheet according to the invention, wherein the hardness Hv5 has a value of 140 to 240.
• the electrical strip or sheet according to the invention preferably obtains its positive properties by the above-mentioned steel grade. Furthermore, the electrical strip or sheet according to the invention preferably obtains the advantageous properties by the specific production method according to the invention, in particular by the final annealing according to the invention.
• "annealing” is understood to mean the annealing of the electrical strip or sheet according to the invention at the end of the production process, ie as the last method step in the production in a process comprising a final annealing at a temperature of 950 to 1100 ° C for a maximum of 90 seconds.
• the present invention therefore also relates to the non-grain-oriented electrical steel or sheet, producible, preferably produced, in a process comprising a final annealing at a temperature of 950 to 1100 ° C for a maximum of 90 s.
• a final annealing is carried out at a temperature of 950 to 1100 ° C., preferably 980 to 1070 ° C., more preferably 980 to 1050 ° C., for example 980 ° C. or 1050 ° C.
• the temperatures mentioned during the final annealing by up to 20 ° C upwards and down to 15 ° C downwards.
• the final annealing according to the invention is carried out for a maximum of 90 s, preferably for a maximum of 80 s, more preferably for a maximum of 70 s.
• the minimum duration of the final annealing is at least 10 s
• the final annealing can be done in any manner known to those skilled in the art.
• the final annealing is preferably carried out in a continuously operated furnace to be passed through by the electrical steel strip or sheet, in particular in a horizontal continuous furnace.
• the described annealing takes place in one stage but not in two stages.
• the present invention therefore preferably relates to the non-grain oriented electrical steel strip or sheet, wherein it is produced by a single stage final annealing.
• the advantage of the single-stage final annealing compared to a two-stage final annealing is For example, that annealing at lower temperatures is possible ie the band has less oxidation.
• a particularly preferred electrical steel according to the invention is obtained by using the above-mentioned particularly preferred type of steel with said preferred alloying elements, and treating the electrical steel strips or sheets so produced with the described final annealing.
• an electrical strip or sheet is obtained, which is particularly advantageous, in particular with regard to further processing in the stamping process. Due to the favorable structure, in particular with respect to the grain size, a slight deterioration of the magnetic and mechanical characteristics is achieved.
• the production of the electrical strip or sheet according to the invention is preferably carried out according to the method described below.
• the present invention therefore furthermore relates to a method for producing the non-grain-oriented electrical strip or sheet according to the invention, comprising at least the following method steps:
• a hot strip that consists of a steel, in addition to iron and unavoidable impurities
• 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 corresponding composition can 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 material temperature of 1020 to 1300 ° C.
• the starting material is, if necessary, reheated or kept at the respective target temperature by utilizing the casting heat.
• 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 2 to 3 mm.
• the hot rolling starts in a conventional manner at a hot rolling start temperature in the finishing scale of 1000 to 1150 ° C and ends with a hot rolling end temperature of 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 during subsequent cold rolling can be avoided. In practice, the reel temperature for this purpose, for example, at most 700 ° C.
• 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 invention, ie at most 0.35 mm, preferably 0.24 to 0.33 mm, more preferably 0.25 to 0.32 mm , most preferably 0.26 to 0.31 mm, each with a deviation of up to 8% corresponds.
• the final annealing contributes significantly to improving the material properties, for example in favor of a higher strength or a lower loss of magnetization.
• final annealing is understood to mean the annealing of the electrical strip or sheet according to the invention at the end of the production process, ie as the last method step in the production when produced in a process comprising a final annealing at a temperature of 950 to 1100 ° C for a maximum of 90 seconds.
• a final annealing is carried out at a temperature of 950 to 1100 ° C., preferably 980 to 1070 ° C., more preferably 980 to 1050 ° C., for example 980 ° C. or 1050 ° C.
• the temperatures mentioned during the final annealing by up to 20 ° C upwards and down to 15 ° C downwards.
• the final annealing according to the invention is carried out for a maximum of 90 s, preferably for a maximum of 80 s, more preferably for a maximum of 70 s.
• the minimum duration of the final annealing is at least 10 s.
• the final annealing can be done in any manner known to those skilled in the art.
• the final annealing is preferably carried out in a continuously operated furnace to be passed through by the electrical steel strip or sheet, in particular in a horizontal continuous furnace.
• the present invention also relates to a component for electrotechnical applications made of an electrical steel strip 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 are preferably basic components of an electrical machine, with which one energy conversion, in particular electrical energy in mechanical, mechanical energy into electrical or electrical energy in electrical, can make.
• the present invention further relates to the use of an electrical strip or sheet 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 basic components of an electrical machine, with which one energy conversion, in particular electrical Energy in mechanical, mechanical energy into electrical or electrical energy in electrical, can make.
• Electric tapes PI to P7 according to the present invention were produced from respective hot strip grades having the compositions shown in Table 1 and the data shown in Table 2.
• WB hot strip
• SEW Specific Electrical Resistance
• 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 according to DIN EN ISO 6892-1: 2017-02 "Metallic materials - Tensile tests - Part 1: Test method at room temperature”.
• the value Hv5 describes the hardness and is determined according to DIN EN ISO 6507-1: 2006-03 "Metallic materials - Vickers hardness test - Part 1: Test method".
• the value A80 describes the elongation at break and is determined in accordance with DIN EN ISO 6892-1: 2017-02 "Metallic materials - Tensile tests - Part 1: Test method at room temperature”.
• yield ratio describes the relationship between Rp0,2 / Rm and is determined according to DIN EN ISO 6892-1: 2017-02 "Metallic Materials - Tensile Tests - Part 1: Test Method at Room Temperature”.
• the grain diameter is determined by microstructural examination by means of light microscopy according to ASTM El 12 "Standard Test Methods for Determining Average Grain Size".
• 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 Epstein Frame. Losses P:
• the loss P is determined in accordance with 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 bending number is determined according to DIN EN ISO 7799: 200-07 "Metallic materials - sheet and strip with a thickness of less than 3 mm - back and forth bending test”.
• the non-grain-oriented electrical steel strip or sheet according to the invention can preferably be used in electric motors, in particular for use in electric vehicles.

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• Chemical & Material Sciences (AREA)
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• 2017
  • 2017-05-15 DE DE102017208146.5A patent/DE102017208146B4/de active Active
• 2018
  • 2018-05-11 WO PCT/EP2018/062185 patent/WO2018210690A1/de unknown
  • 2018-05-11 CN CN202210268891.3A patent/CN114645204A/zh active Pending
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  • 2018-05-11 JP JP2019563069A patent/JP7365907B2/ja active Active
  • 2018-05-11 US US16/609,636 patent/US11041222B2/en active Active
  • 2018-05-11 EP EP18726363.7A patent/EP3625373A1/de active Pending

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