Non-grain-oriented metal electrical steel strip or sheet and method for producing a non-grain-oriented electrical steel strip

Abstract

The invention relates to a non-grain-oriented metal electrical steel strip or sheet, consisting of the components named below, in each case in percent by weight, in short: wt.%: C: 0.0005 to 0.0040; Si: 3.2 to 3.4; Al: 0.85 to 1.05; Mn: up to 0.2; P: up to 0.040, preferably up to 0.020; S: up to 0.0030; N: up to 0.0020; Ti: up to 0.0040; Mo+Nb+V+Zr+Sb+Sn+Cu+Cr+Ni: up to 0.1; residual Fe and unavoidable impurities. The electrical steel strip or sheet has a thickness of < 0.265 mm and a 0.2% yield strength Rp0.2 > 420 MPa. The invention also relates to a method and to a use.

Description

[0001] ZENZ Patentanwälte · Gutenbergstr. 39 · D-45128 Essen T00572WO CK Non-grain-oriented metallic electrical strip or sheet and method for producing a non-grain-oriented electrical strip The invention relates to non-grain-oriented metallic electrical strip or sheet. The invention also relates to a method for producing a non-grain-oriented electrical strip. In the context of the developments described, the term "metallic flat product" encompasses, in particular, rolled products, such as steel strips or steel sheets, or precursors produced by casting, such as slabs. In particular, the invention relates to flat products that are designed as electrical strip made from a steel and flat products that are designed as electrical sheet made from a steel. Non-grain-oriented flat products, in particular non-grain-oriented electrical strip or sheet, are required in many electrical engineering applications and are known from practice.Non-grain-oriented electrical steel strip or sheet, often also 5?E O01-,?9>FDB65A8N 69J=9<GA;EI9=E9 O01-,?9> FDB6?97 <N 69J9=7<A9F" =@ ,A;?=E7<9A 5?E O0-1 ,?97FD=75? 2F99?N !O0-1N ) Non Grain Oriented), dient beispielsweise als Grundmaterial für die Herstellung von Bestandteilen einer rotierenden elektrischen Maschine. In einer solchen Anwendung wird mit dem nicht kornorientierten metallischen Elektroband oder -blech der Verlauf elektromagnetischer Felder gesteuert und verstärkt. Typische Anwendungsfelder derartiger Bänder und Bleche sind Rotoren und Statoren in elektrischen Motoren und elektrischen Generatoren. Bei vielen Elektromotoren ist ein Betrieb bei hohen Drehzahlen pro Zeiteinheit gewünscht, beispielsweise bei Motoren, die für Anwendungen im Rahmen der sogenannten Elektromobilität entwickelt werden und dadurch zunehmend an Bedeutung gewinnen.The operation of an electric motor at high speeds is accompanied by the high frequencies of the required alternating electromagnetic field, which ultimately forms the basis for the motor's drive. Therefore, materials designed for use in comparatively high-frequency alternating electromagnetic fields are increasingly required. When developing electric motors for operation with high-frequency alternating fields, materials developers are faced with the challenge of contributing to increasing the efficiency of the electric motor.Against this background, non-grain-oriented metallic flat products, in particular non-grain-oriented electrical steel and non-grain-oriented electrical steel, are required that combine comparatively low core losses at comparatively high frequencies with comparatively high magnetic polarization and induction, as well as comparatively high permeability, particularly in the relevant ranges of magnetic field strength, namely at comparatively low magnetic field strengths. Good combinations of these properties are achieved in proven electrical steel and electrical steel by a high weight fraction of silicon and / or aluminum in the starting alloy of the electrical steel and electrical steel.However, high proportions of these elements are generally associated with the disadvantage that corresponding NO electrical strips or NO electrical sheets with the aforementioned properties exhibit a comparatively high degree of brittleness due to their high silicon and / or aluminum content, with the associated disadvantages in processability, for example, in cold rolling. For example, strip tears may occur more frequently during cold rolling of corresponding NO electrical strips. The acceptable degree of brittleness, in turn, is linked to the sheet thickness of the electrical strip or sheet, so that an optimization of the material properties over opposing physical effects is necessary.Against the background of the above explanations, the object of the invention is to provide alternatives to known electrical strips or sheets which, with regard to their magnetic properties on the one hand and their mechanical properties on the other, meet the requirements to a consistent or greater extent, while also enabling production in small thicknesses. The invention is achieved 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 8. The invention is further achieved with an electrical strip having the features of claim 16 and with a use according to claim 17. 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: wt.%: C: 0.0005 up to 0.0040, that is: a value of 0.0005 or greater but at most 0.0040, preferably 0.0025 up to 0.0037; Si: 3.2 up to 3.4, preferably 3.25 to 3.35; Al: 0.85 up to 1.05, preferably 0.90 up to 1.05; Mn: up to 0.2; P: up to 0.040, preferably up to 0.020; S: up to 0.0030; N: up to 0.0020; Ti: up to 0.0040; Optional components: Mo, Nb, V, Zr, Sb, Sn, Cu, Cr, Ni, for all of these with the proviso: the sum of all of the elements mentioned is less than 0.1 wt.%; the remainder is Fe and unavoidable impurities. Furthermore, the electrical steel strip or sheet according to the invention is characterized by a thickness of <0.265 mm, preferably <0.260 mm, and a 0.2% yield strength Rp0.2 of >420 MPa.The material characteristic yield strength Rp0.2 is to be understood as determined in accordance with DIN EN ISO 6892-1:2020-06. With the targeted combination of alloying specifications with narrowly defined content proportions, in particular also specifically for Si, Al and the permitted total content of optional components on the one hand, and a comparatively small thickness of the electrical steel strip or sheet with a sufficiently high yield strength, it was surprisingly possible to provide an electrical steel strip or sheet. In particular, eddy current losses could be prevented to their extent due to the comparatively high proportion of Si and Al. Despite the high proportion of Si and Al as alloy components, it was found that the magnetic polarization in the samples according to the invention and their further developments is also comparatively high. The limitation of the optional components Mo, Nb, V, Zr, Sb, Sn, Cu, Cr, Ni for all of these with the proviso that the sum of all of the elements mentioned is less than 0.1 wt.-% of the electrical steel strip or sheet, was taken to largely avoid any impairment, particularly of the magnetic properties. In a preferred embodiment, the content of the constituents C, S, N, and Ti is limited such that the sum of the contents of C, S, N, and Ti amounts to a maximum of 0.0100 wt.%. This provision largely avoids any impairment, particularly of the magnetic properties. The thickness of the electrical steel strip or sheet is preferably between 0.230 mm and 0.260 mm, particularly preferably between 0.235 mm and 0.250 mm.The precise matching of the strip thickness or sheet thickness and the alloying specification to one another has overcome a major hurdle, since with the stated thickness values ​​and when observing the alloying specifications specified in the invention, it has been shown that samples with very good magnetic properties on the one hand and sufficiently good mechanical properties on the other, in particular the values ​​for the 0.2% yield strength provided by the invention, can be obtained. Particularly preferred are designs in which the electrical strip or sheet has a 0.2% yield strength Rp0.2 > 420 MPa and less than 460 MPa. Samples with sufficiently good strength are available in this range. In an advantageous design, the electrical strip or sheet displays loss values ​​P(1.0T;400Hz) < 13.00 W / kg, preferably P(1.0T;400Hz) < 12.80 W / kg, particularly preferably P(1.0T;400Hz) < 12.70 W / kg.It is particularly preferred if one, several, or preferably all of the following loss values ​​are additionally shown: P(1.5T;50Hz) < 2.3 W / kg, and / or P(1.0T;700Hz) < 29 W / kg, and / or P(1.0T;1000Hz) < 50 W / kg, and / or P(1.0T;2000Hz) < 150 W / kg. The symbol P(1.0T;400Hz) symbolizes core loss in watts per kilogram, in short: W / kg, in an alternating electromagnetic field with a core frequency of 400 Hz and a magnetic flux density of 1.0 T in the material. The same applies analogously to other numerical values ​​given in parentheses. Since P is a thickness-dependent parameter, it applies to the measured sample as presented in the invention, with the sample thickness advantageously being between 0.230 mm and 0.260 mm, preferably between 0.235 mm and 0.250 mm. The specified parameters were chosen as representative because they are frequently encountered in performance requirements for manufacturers.The core losses are to be understood as meaning of DIN EN 60404-2:2019-05: Magnetic materials - Part 2: Methods for determining the magnetic properties of electrical steel strip and sheet using 9=A9E ,CEF9=AD5<@9AEN JG. The electrical steel strip or sheet preferably also has a polarization J100;50Hz > 0.970 T, preferably J100;50Hz > 0.980 T, particularly preferably J100;50Hz > 1.000 T. The symbol J100;50Hz denotes the magnetic polarization at a magnetic field strength of 100 A / m in an alternating electromagnetic field of 50 Hz. The specified parameters were chosen as representative because they are frequently encountered parameters in the performance requirements placed on 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 according to ODIN EN 60404-2:2019-05: Magnetic Materials M Part 2: Method for determining the magnetic properties of electrical steel strip and sheet using an Epstein frame. The polarization applies in particular to the measured sample as it is presented according to the invention, with the sample thickness advantageously being between 0.240 mm and 0.260 mm, preferably between 0.235 mm and 0.250 mm. The polarization parameters are to be understood in this sense. Particularly preferably, the electrical steel strip or sheet has a EC9J=:=E7<9A 9?9>FD=E7<9A 4=89DEF5A8 JI=E7<9A $"'% KL@ and $"'& KL@ 69= 9=A9D 39@C9D5FGD HBA &$ -D58 *9?E=GE. In particular, these values ​​are obtained at a thickness, preferably at any thickness, between 0.230 mm and 0.260 mm, particularly preferably between 0.235 mm and 0.250 mm.A specific electrical resistance with this requirement correlates with the good magnetic properties obtained. A further concept of the invention relates to a method for producing a non-grain-oriented electrical steel strip. Using one of the methods explained below, materials can be produced that have advantages of the type described above. For example, the method according to the invention explained below produces an electrical steel strip that has a particularly advantageous combination of properties.The following steps are carried out: (A) Providing a hot-rolled, optionally hot-strip annealed, for example non-grain-oriented, electrical steel strip with a thickness between 1 mm and 3 mm, preferably between 1.5 mm and 2.5 mm; (B) Cold-rolling the electrical steel strip provided in step (A) to a thickness between 0.200 mm and 0.300 mm, preferably between 0.200 mm and 0.265 mm; (C) Final annealing and cooling the cold-rolled strip obtained in step (B) to obtain the non-grain-oriented electrical steel strip. The provision of the electrical steel strip of greater thickness, as mentioned in step (A), will not be explained in detail here, as it is a process well known to those skilled in the art. For example, the electrical steel strip of greater thickness can be produced using a conventional production route via a continuous casting plant or via thin slab production.In both processes, a steel melt with a suitable specification, for example of the type mentioned above, is melted and cast into a starting material, which in conventional production can be a slab or a thin slab. The resulting starting material can then be heated to a starting material temperature of, for example, between 1100 and 1300 degrees Celsius. For this purpose, the starting material is reheated if necessary or maintained at the respective target temperature using the casting heat. The thus heated starting material can then be hot-rolled into a hot strip with a thickness of, for example, between 1 mm and 3 mm, preferably between 1.5 mm and 2.5 mm.Hot rolling begins, for example, in a conventional manner at a hot rolling starting 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 resulting hot strip can then be cooled to a coiling temperature and coiled into a coil. The coiling temperature is ideally selected to avoid problems during the subsequent cold rolling. In practice, the coiling temperature is, for example, a maximum of 700 degrees Celsius, preferably between 550 and 700 degrees Celsius. The hot-rolled electrical strip or sheet from step (A) can be transferred directly, i.e. immediately afterward, to step (B) of the process according to the invention.In a preferred embodiment of the process according to the invention, however, hot strip annealing is carried out at a temperature of 700 to 1000 degrees Celsius in a step (A') after step (A) and before step (B). According to the invention, the final annealing is carried out in a continuous furnace. During the final annealing, the specific strip tension is kept low in a controlled manner at least at one of the two ends of the continuous furnace. This is done in such a way that at least one of the two following conditions is met: - the specific infeed strip tension is at most 7 N / mm², preferably at most 5.3 N / mm², particularly preferably at most 4.0 N / mm², and / or - the specific exit strip tension is at most 4 N / mm², preferably at most 3.5 N / mm², particularly preferably at most 3.0 N / mm². Both conditions are preferably met cumulatively.The specific strip tension is the quotient of the strip tension, which is a force with the unit N, and the cross-section of the strip. The strip tension is a quantity known to those skilled in the art when transporting steel strip, and its measurement and monitoring is a common professional measure when operating strip lines. The measurement can be carried out, for example, using a commercially available force transducer, also known as a strain gauge, with a measuring amplifier. It is particularly preferred to transport the electrical steel strip using an infeed roller stand positioned upstream of the continuous furnace in the strip transport direction with the infeed strip tension, and an outfeed roller stand positioned downstream of the continuous furnace in the strip transport direction with the outfeed strip tension.During the final annealing in step (C), a high annealing temperature, i.e. maximum temperature, is preferably reached which lies between 970 degrees Celsius and 1100 degrees Celsius, preferably between 1000 degrees Celsius and 1060 degrees Celsius. The final annealing carried out in step (C) is particularly preferably carried out with the following parameters: (C1) First, heating takes place 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. (C2) As soon as the temperature provided for in step (C1) has been reached, heating continues beyond this temperature at a heating rate between 5 and 150 K / s to the high annealing temperature. The process is particularly preferably adjusted such that the high annealing temperature is maintained for a period of between 10 and 90 seconds.In operational practice, the high annealing temperature is maintained in certain furnace zones by, among other things, the furnace length and the corresponding adjustment of the strip transport speed. After the final annealing, the cold strip cools down to room temperature, whereby the cooling of the cold strip preferably takes place to room temperature at a cooling rate of no more than 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 adverse effects on the magnetic behavior of the strip. The annealing in step (C) preferably takes place in an annealing atmosphere that - consists of at least 70 vol. percent H2, and / or - is carried out at a dew point of Tp < 0 degrees Celsius. Both conditions are preferably present cumulatively.It is particularly preferred that the electrical steel strip provided in step (A) is produced from a material with the alloying specification stated below, wherein the details are given in weight percent, in short: wt.%: C: 0.0005 up to 0.0040; Si: 3.2 up to 3.4; Al: 0.85 up to 1.05; Mn: up to 0.2; P: up to 0.040, preferably up to 0.020; S: up to 0.0030; N: up to 0.0020; Ti: up to 0.0040; Mo+Nb+V+Zr+Sb+Sn+Cu+Cr+Ni: up to 0.1; remainder Fe and unavoidable impurities; preferably with a content of the sum of C, S, N and Ti of a maximum of 0.0100 wt.%. Following this alloying specification results in an electrical steel strip as described above, along with the correspondingly advantageous combination of magnetic and mechanical properties. The cold rolling in step (B) is preferably carried out to a cold-rolled steel strip thickness between 0.230 mm and 0.260 mm, preferably between 0.235 mm and 0.250 mm.A further concept of the invention relates to an electrical steel strip as can be obtained using a method of the aforementioned manner, but is manufactured using any other method. This includes in particular, but not exclusively, the electrical steel strips of the type mentioned at the outset and their developments, as well as the advantageous material properties associated with them. An electrical steel strip or an electrical sheet of the type mentioned at the outset or a development thereof is particularly suitable for use in electrical machines. One concept of the invention therefore includes a cutout punched out of an electrical steel strip or an electrical steel strip, which is used as a lamination of a component of an electrical machine, in particular as a component of a stator or a rotor of an electrical machine.For example, a number of laminations can be punched out of an electrical strip or an electrical sheet of the type mentioned at the beginning or a further development thereof and joined together, for example by gluing with a suitable adhesive, so that the joined laminations form a stator or a rotor. Examples The invention is illustrated in more detail below using exemplary embodiments. Strips were produced from alloys with different analyses. The analyses are shown in Table 3. They are classified under the designations B1 and B2. A cold-rolled strip with the specified thickness was finally annealed and then cooled. During the final annealing, the specific inlet strip tension was varied between 2.5 N / mm² and 7.2 N / mm². Likewise during the final annealing, the specific outlet strip tension was varied, namely between 2.1 N / mm² and 4.6 N / mm².The obtained samples were characterized for their magnetic and mechanical properties. 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 the determination of the magnetic properties of electrical steel strip and sheet with .=?:9 9=A9E ,CEF9=AD5<@9AEN# ,?9>F. The sheets were cut into longitudinal and transverse strips and measured as a mixed sample in the Epstein frame. The magnetic values ​​P were determined at 1.0 T and 1.5 T for 200 Hz and 400 Hz, respectively. The magnetic values ​​P were determined at 1.0 T for 700 Hz, 1000 Hz, 1500 Hz, and 2000 Hz, respectively.These values, as well as J at 50 Hz and 100 A / m, 200 A / m, 2500 A / m, 5000 A / m and 10000 A / m, were measured using an Epstein frame, in particular in accordance with DIN EN 60404-2:2019-$&( O / 5;A9F=E7<9 Materials - Part 2: Method for the determination of the magnetic properties of electrical steel strip and sheet using a ,CEF9=AD5<@9AEN# +569= IGD89A 9AFECD97<9A89 ,?9>FDB6?97<9 =A longitudinal and transverse strips and measured as a mixed sample in the Epstein frame. The material characteristic yield strength Rp0.2 was determined in accordance with DIN EN ISO 6892-1:2020-06. The results can be found in Table 1 and Table 2. The results were only For reasons of space, the results are presented in two tables, with Tables 1 and 2 being partially redundant. Table 1 and Table 2 show the temperature and the specific inlet and outlet strip tensions during the final annealing, with the final annealing taking place for the samples between 23 and 28 seconds, in conjunction with selected magnetic properties.The samples can be classified according to the requirement that samples with a combination of favorable magnetic properties and favorable mechanical properties should be obtained. The following results were obtained: 1. With an alloy from analysis B1, a favorable loss value P(1.0T;400Hz) < 13 W / kg was achieved. With an alloy from analysis B2, this was not possible. 2. With an alloy from analysis B1, values ​​J100;50Hz > 0.970 T were achieved. With an alloy from analysis B2, this was not possible. 3. To obtain values ​​J100;50Hz > 0.970 T with an alloy from analysis B1, sufficiently small values ​​for the strip tension must be set. 4.A particularly advantageous combination of low losses P(1.0T;400Hz) < 13 W / kg (preferably < 12.7 W / kg) and simultaneously high polarization values ​​J100;50Hz > 0.970 T can be achieved if a suitable alloy is obtained using an alloy with an analysis from B1 and the strip tensions are set to sufficiently low values ​​during the final annealing. The result is a picture according to which samples according to the invention with small thicknesses and sufficient yield strength Rp0.2 can be obtained by systematically classifying property profiles depending on the composition of the starting alloy. Furthermore, it can be seen that the samples classified according to the invention can be produced using the method according to the invention, whereas a method not according to the invention produces samples not according to the invention.

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Claims

ZENZ Patentanwälte · Gutenbergstr. 39 · D-45128 Essen T00572WO CK Patent claims 1. Non-grain oriented metallic electrical strip or sheet, consisting of the following components, each in percent by weight, in short: wt.%: C: 0.0005 up to 0.0040; Si: 3.2 up to 3.4; Al: 0.85 up to 1.05; Mn: up to 0.2; P: up to 0.040, preferably up to 0.020; S: up to 0.0030; N: up to 0.0020; Ti: up to 0.0040; Mo+Nb+V+Zr+Sb+Sn+Cu+Cr+Ni: up to 0.1; The remainder is Fe and unavoidable impurities. The electrical strip or sheet has a thickness of <0.265 mm, preferably <0.260 mm, and a 0.2% yield strength Rp0.2 of >420 MPa.

2. Electrical strip or sheet according to claim 1, wherein the sum of C, S, N, and Ti contains a maximum of 0.0100 wt.%.

3. Electrical strip or sheet according to any one of the preceding claims, wherein the thickness of the electrical strip or sheet is between 0.230 mm and 0.260 mm, preferably between 0.235 mm and 0.250 mm. 2 4. Electrical strip or sheet according to one of the preceding claims, wherein the electrical strip or sheet has a 0.2% yield strength Rp0.2 > 420 MPa.

5. Electrical strip or sheet according to one of the preceding claims, wherein it has loss values ​​P(1.0T;400Hz) < 13.00 W / kg, preferably P(1.0T;400Hz) < 12.80 W / kg, particularly preferably P(1.0T;400Hz) < 12.70 W / kg, preferably additionally P(1.5T;50Hz) < 2.3 W / kg, and / or P(1.0T;700Hz) < 29 W / kg, and / or P(1.0T;1000Hz) < 50 W / kg, and / or P(1.0T;2000Hz) < 150 W / kg.

6. Electrical steel strip or sheet according to one of the preceding claims, wherein it has a polarization J100;50Hz > 0.970 T, preferably J100;50Hz > 0.980 T, particularly preferably J100;50Hz > 1.000 T.

7. Electrical steel strip or sheet according to one of the preceding claims, having a specific electrical resistance between 0.62 µΩm and 0.65 µΩm at a temperature of 50 degrees Celsius.

8. A process for producing a non-grain-oriented electrical steel strip, 3 comprising at least the following process steps: (A) providing a hot-rolled, optionally hot-strip annealed electrical steel strip with a thickness between 1 mm and 3 mm, preferably between 1.5 mm and 2.5 mm; (B) cold-rolling the electrical steel strip provided in step (A) to a thickness between 0.200 mm and 0.300 mm, preferably between 0.200 mm and 0.265 mm; (C) final annealing and cooling the cold strip obtained in step (B) to obtain the non-grain-oriented electrical steel strip, wherein the final annealing is carried out in a continuous furnace, wherein during the final annealing the specific infeed strip tension is at most 7 N / mm², preferably at most 5.3 N / mm², particularly preferably at most 4.0 N / mm², and / or the specific exit strip tension is at most 4 N / mm², preferably at most 3.5 N / mm², particularly preferably at most 3.0 N / mm². 9.Method according to claim 8, characterized in that the final annealing, wherein during the final annealing, a high annealing temperature during a high annealing period is between 970 degrees Celsius and 1100 degrees Celsius, preferably between 1000 degrees Celsius and 1060 degrees Celsius.

10. Method according to claim 9, characterized in that the final annealing (C1) is carried out at a heating rate of at least 40 K / s to a temperature between 850 degrees Celsius and 950 degrees Celsius. 4, preferably between 880 degrees Celsius and 920 degrees Celsius, and then (C2) is heated to the annealing temperature at a heating rate of between 5 and 150 K / s.

11. Process according to claim 9 or claim 10, characterized in that the annealing period is from 10 seconds to 90 seconds.

12. Process according to one of claims 8 to 11, characterized in that the cooling of the cold strip in step (C) to room temperature takes place at a maximum cooling rate of 25 K / s.

13. Process according to one of claims 8 to 12, characterized in that the annealing of step (C) is carried out - in an annealing atmosphere with at least 70 vol. percent H2, and / or - at a dew point of Tp < 0 degrees Celsius.

14. The method according to any one of claims 8 to 13, characterized in that the electrical steel provided in step (A) consists of: the following components, each in percent by weight, in short: wt.-%: C: 0.0005 up to 0.0040; Si: 3.2 up to 3.4; Al: 0.85 up to 1.05; Mn: up to 0.2; P: up to 0.040, preferably up to 0.020; S: up to 0.0030; N: up to 0.0020;. 5 Ti: up to 0.0040 Mo+Nb+V+Zr+Sb+Sn+Cu+Cr+Ni: up to 0.1; remainder Fe and unavoidable impurities; preferably with a content of the sum of C, S, N and Ti of at most 0.0100 wt. %.

15. Process according to one of claims 8 to 14, characterized in that the cold rolling in step (B) is carried out to a thickness between 0.230 mm and 0.260 mm, preferably between 0.235 mm and 0.250 mm.

16. Electrical steel strip obtainable by a process according to one of claims 8 to 15.

17. Use of a cutout punched out of the electrical steel strip or sheet according to one of claims 1 to 7 as a lamination which is used as a component of an electrical machine, in particular as a component of a stator or a rotor of an electrical machine.

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