EP3491158B1 - Bande d'acier destinée à la fabrication d'une tôle pour circuits magnétiques à grains non orientés et procédé de fabrication d'une telle bande d'acier - Google Patents

Bande d'acier destinée à la fabrication d'une tôle pour circuits magnétiques à grains non orientés et procédé de fabrication d'une telle bande d'acier Download PDF

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EP3491158B1
EP3491158B1 EP17745283.6A EP17745283A EP3491158B1 EP 3491158 B1 EP3491158 B1 EP 3491158B1 EP 17745283 A EP17745283 A EP 17745283A EP 3491158 B1 EP3491158 B1 EP 3491158B1
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strip
steel
rolling
hot
steel strip
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EP3491158A1 (fr
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Zacharias Georgeou
Frank Klose
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Salzgitter Flachstahl GmbH
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Salzgitter Flachstahl GmbH
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • 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
    • C21D8/1272—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • 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
    • H01F1/18—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 with insulating coating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
    • C21D8/1211—Rapid solidification; Thin strip casting
    • 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
    • C21D8/1244—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
    • C22C2202/00—Physical properties
    • C22C2202/02—Magnetic

Definitions

  • the invention relates to a steel strip for producing a non-grain-oriented electrical steel sheet and a method for producing such a steel strip.
  • Materials for electrical steel are z. B. from the DE 101 53 234 A1 or DE 601 08 980 T2 known. They usually consist of an iron-silicon or iron-silicon-aluminum alloy, a distinction being made between grain-oriented (KO) and non-grain-oriented (NO) electrical sheets and these are used for different applications. Aluminum and silicon are added in particular in order to obtain an increase in strength and a reduction in density, and in particular an increase in electrical resistance, with the magnetic saturation polarization as unchanged as possible.
  • non-grain-oriented electrical steel For applications in electrical engineering, in which the magnetic flux is not fixed in any particular direction and therefore equally good magnetic properties are required in all directions, electrical steel is usually produced with properties that are as isotropic as possible, which is referred to as non-grain-oriented (NO) electrical steel.
  • NO non-grain-oriented
  • the ideal structure (structure) for a non-grain-oriented (NO-) electrical steel is a polycrystalline structure with grain sizes between 20 ⁇ m and 200 ⁇ m, whereby the crystallites are randomly aligned in the plane of the sheet with the surface (100).
  • the magnetic properties of real, non-grain-oriented electrical steel in the plane of the sheet are dependent to a small extent on the direction of magnetization. The differences in loss between the longitudinal and transverse directions are max. 10%.
  • the development of a sufficient isotropy of the magnetic properties in non-grain-oriented electrical steel is significantly influenced by the design of the hot forming, cold forming and final annealing process.
  • the magnetic properties of electrical steel are essentially due to a high degree of purity, the content of silicon and aluminum (up to approx. 4 mass fractions in%) and the targeted addition of others Alloying elements such as B. manganese, sulfur and nitrogen, as well as determined by hot rolling, cold rolling and annealing processes.
  • Alloying elements such as B. manganese, sulfur and nitrogen, as well as determined by hot rolling, cold rolling and annealing processes.
  • the usual sheet thicknesses are in the range well below 1 mm, e.g. B. at 0.18 or 0.35 mm.
  • the one from the Offenlegungsschrift DE 101 53 234 A1 known material for a non-grain oriented electrical steel sheet has an alloy composition in wt .-% with C ⁇ 0.02%, Mn ⁇ 1.2%, Si 0.1-4.4% and Al 0.1-4.4% .
  • the Patent DE 603 06 365 T2 discloses a material for a non-grain-oriented electrical steel sheet in% by weight, consisting of up to about 6.5% silicon, 5% chromium, 0.05% carbon, 3% aluminum, 3% manganese, the remainder iron and residues.
  • the steel strip is produced by a vertical thin strip casting process in which the liquid steel is poured into the casting gap of two counter-rotating, internally cooled casting rolls. The cast strip can then be hot-rolled and cold-rolled, with strip thicknesses of less than 1 mm being achieved.
  • a hot strip for producing a non-grain-oriented or grain-oriented electrical steel sheet, the hot strip consisting of the following alloy composition in% by weight: C: 0.001 to 0.08, Al: 4.8 to 20, Si: 0.05 to 10, B : up to 0.1, Zr: up to 0.1, Cr: 0.1 to 4, remainder iron and impurities from the melting process.
  • the hot strip is manufactured in such a way that the melt is first poured into a pre-strip in the range between 6 and 30 mm in a horizontal strip caster in a flow-calmed and bending-free manner and then rolled into hot strip with a degree of deformation of at least 50%. The hot strip can then be cold rolled to a thickness of up to 0.150 mm.
  • the known alloys for non-grain oriented electrical steel have the disadvantage that the magnetic properties, in particular the hysteresis losses, are heavily dependent on the frequency and the amplitude of the magnetizing current. In particular, increase at high frequencies and higher amplitudes clearly show the hysteresis losses, which has a disadvantageous effect especially with high-speed motors.
  • the electrical steel sheet is made of steel with the following chemical composition: C: 0.01% or less; Si: 2.0 to 7.0%; Al: 0.3 to 10.0%; Mn: 0.2 to 2.0%; P: 0.1% or less; S: 0.005% or less and of Ni: 0.1 to 5% and / or Cu: 0.1 to 3%.
  • JP 2008 223045 A discloses a non-oriented electromagnetic steel sheet whose strength can be increased with an aging heat treatment.
  • the steel sheet has a steel composition containing, in mass%, 0.02 or less C; 0 to 1 Si; 1 or less; Mn: 0.2 or less; P: 0.03 or less; S: 2 to 4; Al: 0.1 to 2 Ni; comprises more than 1 to 3 Cu and the remainder Fe with impurities.
  • the disclosure document WO 00/75389 A1 describes a steel component of a solid oxide fuel cell.
  • the steel component should have good heat resistance and be particularly suitable for use in an environment with an oxidizing atmosphere.
  • the following chemical composition is specified in% by weight for the steel component: Al: 5.0-10.0; Si: 0.1-3.8; Mn: ⁇ 0.5; Cu: ⁇ 0.23; Ni: ⁇ 0.61; C: ⁇ 0.02; P: ⁇ 0.04; S: ⁇ 0.04; Cr: ⁇ 5.0 balance iron and unavoidable impurities.
  • the object of the invention is to specify a steel strip for producing a non-grain-oriented electrical steel sheet which, compared to known electrical steel sheets, has significantly improved frequency-independent magnetic properties, in particular significantly reduced hysteresis losses. Another object is to provide a manufacturing method for such a steel strip.
  • the specific volume resistance of the material can also be advantageously influenced.
  • this essentially means that at least 50% of the insulation layer consists of Al 2 O 3 or SiO 2 or the sum of the two aforementioned components.
  • the thickness of the insulation layer is preferably in the range from 20 ⁇ m to 100 ⁇ m and particularly preferably in the range from 20 ⁇ m to 50 ⁇ m.
  • Al-containing precipitates in the steel significantly increase the strength.
  • the minimum aluminum content is set at 1% by weight.
  • Al contents higher than 12% by weight can lead to difficulties in cold rolling due to the formation of ordered phases. It is therefore advantageous to adhere to Al contents of up to 10% by weight.
  • the hot strip according to claim 16 is hot-rolled at temperatures above 1000 ° C or higher, there is a very high level of protection against scaling. Due to the extraordinarily high Al contents of up to 12% by weight or Si of up to 3.5% by weight, a dense, intrinsically formed insulation layer essentially consisting of Al 2 O 3 is formed on the surface of the heated sheet and / or SiO 2 , which effectively reduces or even completely inhibits scaling of the iron in the steel.
  • the thickness of the layer can also advantageously be influenced by the temperature and the time span of the annealing, in particular the final annealing of the steel strip, which is usually understood to mean a cold strip. The thickness of the layer increases with increasing temperature and time of annealing.
  • this layer of scale should not exceed a thickness of 100 ⁇ m, better 50 ⁇ m, so that the layer, because of the increasing brittleness with increasing thickness, the rollability is not adversely affected by flaking scale.
  • An addition of Si causes an increase in the electrical resistance.
  • a minimum content of 0.3% by weight is required to achieve an effect.
  • contents of more than 3.5% by weight Si the cold-rollability is reduced, since the material becomes increasingly brittle and there are more edge cracks on the steel strip.
  • Contents of 1.0 to 3.0% by weight and preferably from 1.5 to 2.5% by weight are therefore advantageously set.
  • the addition of Si and Al represents an optimal combination of increasing the electrical resistance and reducing the magnetic saturation polarization in the selected alloy element contents.
  • the carbon content should be kept as low as possible in order to prevent magnetic aging, which is caused by carbide precipitations, in the finished steel strip. Low carbon contents lead to an improvement in the magnetic properties, since fewer defects occur in the material, which are caused, for example, by the carbon atoms and carbides. Carbon contents of a maximum of 0.03% by weight have been found to be favorable.
  • Manganese is contained in the steels according to the invention in an amount of more than 0.25 up to 10% by weight. Manganese increases the volume resistivity. In order to produce a corresponding effect, the steel should contain more than 0.25% by weight of manganese. In order to ensure problem-free further processing by hot and cold rolling, the manganese content should not exceed 10% by weight because of the formation of brittle phases.
  • a negative effect of Mn for the rollability depends on the sum of the elements Al, Si and Mn. A total Mn + Al + Si content of less than or equal to 20% by weight should advantageously be maintained as the upper limit for the rollability.
  • the addition of copper also increases the volume resistivity.
  • the Cu content should be more than 0.05% by weight. No more than 3% by weight Cu should be added to the steel, since otherwise the rollability is impaired due to precipitates that form on the grain boundaries and solder cracks may occur during hot rolling.
  • the addition of nickel has a positive effect in terms of reducing the magnetic reversal losses.
  • the minimum content should be above 0.01% by weight, but since nickel is a very expensive element, a maximum value of 5.0% by weight should not be exceeded for economic reasons.
  • the nickel content is preferably between 0.01 and 3.0% by weight.
  • these alloy compositions can be used to produce steel strips with similar electromagnetic properties with a specific density of 6.40 to 7.30 g / cm 3 in order to meet the requirements for the lowest possible specific weight of the steel strip.
  • the mechanical properties can also be varied over a wide range through the different alloy concepts.
  • Steel strips according to the invention have a strength Rm of 450 to 690 MPa, a yield point Rp0.2 of 310 to 550 MPa and an elongation A80 of 5 to 30%.
  • the advantage of the proposed method is also to be seen in the fact that when a horizontal strip caster is used, macro segregation and voids can largely be avoided due to the very homogeneous cooling conditions in the horizontal strip caster.
  • the strip casting process In terms of process technology, it is proposed for the strip casting process to achieve flow calming by using an electromagnetic brake that generates a synchronous or optimal relative speed to the strip, which ensures that, in the ideal case, the speed of the melt inflow is equal to the speed of the circulating one Conveyor belt is.
  • the bending during solidification which is regarded as disadvantageous, is avoided in that the underside of the casting belt receiving the melt is supported on a plurality of rollers lying next to one another.
  • the support is reinforced in such a way that a negative pressure is generated in the area of the casting belt, so that the casting belt is pressed firmly onto the rollers.
  • the Al-rich or Si-rich melt solidifies in an almost oxygen-free casting atmosphere.
  • the length of the conveyor belt is chosen so that at the end of the conveyor belt the pre-belt has largely solidified before it is deflected.
  • the rolling of the pre-strip into hot strip can be done either in-line or separately off-line. Before the off-line rolling, the pre-strip can either be directly hot reeled or cut into sheets after production before cooling. The strip or sheet material is then reheated after any cooling and unwound for off-line rolling or reheated and rolled as sheet.
  • the rolling of the hot strip to its final thickness can be carried out by means of classic cold rolling at room temperature or, according to the invention, particularly advantageously at an elevated temperature well above room temperature.
  • finish rolling is used below when a hot strip is finish-rolled at an elevated temperature to the required final thickness.
  • finish rolling at elevated temperatures is that it can significantly reduce a possible tendency to edge cracks during rolling.
  • the hot strip is heated to a temperature range from 350 to 570 ° C., preferably from 350 to 520 ° C., and is finish-rolled to the intended final thickness at this temperature.
  • the hot strip is finish-rolled to the required final thickness at room temperature.
  • two-stage cold rolling according to Route 2 can be used by first rolling to the desired final thickness at room temperature with a degree of thickness reduction of up to 60%, then in a temperature range of 550 aged up to 650 ° C for 40 to 60 min, and then the remaining 40% of the desired final thickness is in turn achieved by cold rolling.
  • a material, in particular with an increased Al content greater than 6% by weight or Al + Si in total greater than 6% by weight, which has edge cracks after the first cold rolling, can be produced according to route 3 by finish rolling at an elevated temperature. After heating in a temperature range from 350 to 600 ° C, preferably 350 to 520 ° C, rolling is carried out, and then iteratively reheated in the aforementioned temperature range for 2-5 min between the rolling steps and finish-rolled until the desired final thickness is reached.
  • Table 2 shows the mechanical properties of the alloys and the determined specific density of the materials. In addition to different mechanical properties, materials with different specific densities can also be produced, so that a wide range of requirements can be met for the materials according to the invention.
  • Table 2 Mechanical properties; 0.7mm thickness alloy Rp 0.2 Rm A80 density [N / mm 2 ] [%] [kg / dm 3 ] 13 679 688 2 6.8 17th 570 635 6th 6.9 22nd 560 600 1.6 7.1 Ref1 500 600 15.0 7.6
  • Table 3 shows the results for measuring the frequency dependence of the magnetic flux density B max on steel sheets with a thickness of 0.7 mm of the alloys examined. The measurements were carried out at frequencies f of 50, 200, 400, 750 and 1000 Hz. The results impressively demonstrate the extensive frequency independence of the magnetic flux density and thus the hysteresis losses in a periodic alternating field.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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  • Soft Magnetic Materials (AREA)

Claims (11)

  1. Bande d'acier destinée à la production d'une tôle électrique à grains non orientés, en particulier produite par un procédé selon les revendications 8 à 11, ladite bande ayant la composition d'alliage suivante en % en poids :
    C : ≤ 0,03
    Al : 1 à 12, de préférence de 10 maximum
    Si : 0,3 à 3,5, de préférence de 1,0 à 3,0, de manière particulièrement préférée de 1,5 à 2,5
    Mn : >0,25 à 10
    Cu : >0,05 à 3,0
    Ni : >0,01 à 5,0, de préférence de 3,0 maximum
    Somme de N, S et P : au plus 0,07
    le reste est du fer et des impuretés du processus de fusion, avec ajout éventuel d'un ou de plusieurs éléments parmi Cr, Mo, Zn et Sn, la teneur totale en Cr et Mo étant éventuellement de 0,01 à 0,5 % en poids et la teneur totale en Zn et Sn étant éventuellement de 0 0,01 à 0,05% en poids, la bande d'acier comportant une couche isolante comprenant sensiblement Al2O3 et/ou SiO2 avec une épaisseur de 10 µm à 100 µm.
  2. Bande d'acier selon la revendication 1, caractérisée par l'épaisseur de la couche isolante dans la gamme de 20 µm à 100 µm, de préférence de 20 µm à 50 µm.
  3. Bande d'acier selon la revendication 1 ou 2, caractérisée par une teneur totale maximale en Mn et Al de 20 % en poids.
  4. Bande d'acier selon l'une au moins des revendications 1 à 3, caractérisée par la composition d'alliage suivante en % en poids :
    Al : 1 à 6
    Si : 0,5 à 1
    Mn : >1,0 à 7
    Cu : >0,1 à 2,0
    Ni : >0,1 à 3,0.
  5. Bande d'acier selon l'une au moins des revendications 1 à 4, caractérisée par la composition d'alliage suivante en % en poids :
    Al : >6 à 10
    Si : 0,5 à 0,8, de préférence 0,3 à 0,5
    Mn : >0,5 à 3, de préférence >0,5 à 2
    Cu : >0,1 à 2,5, de préférence > 0,1 à 0,5
    Ni : > 0,1 à 2,5.
  6. Bande d'acier selon l'une au moins des revendications 1 à 5 ayant une densité spécifique de 6,40 à 7,30 g/cm3.
  7. Bande d'acier selon l'une au moins des revendications 1 à 6 ayant une résistance Rm de 450 à 690 MPa, une limite élastique Rp0,2 de 310 à 550 MPa et un allongement A80 de 5 à 30 %.
  8. Procédé de production d'une bande d'acier destinée à la production d'une tôle électrique non à grains orientés, le procédé comprenant les étapes suivantes :
    - obtenir un acier liquide à partir d'un acier selon l'une au moins des revendications 1 à 7 précédentes,
    - couler l'acier liquide pour obtenir une pré-bande à l'aide d'un procédé de coulée en bande horizontale ou verticale proche de la dimension finale ou couler l'acier liquide pour obtenir une brame ou une brame mince à l'aide d'un procédé de coulée en brame ou brame mince horizontale ou verticale,
    - réchauffer la brame ou la brame mince jusqu'à atteindre une température de 1050 °C à 1250 °C puis laminer à chaud la brame ou la brame mince pour obtenir une bande laminée à chaud ou réchauffer la pré-bande produite proche de la dimension finale à une température de 1000 °C à 1100 °C puis laminer à chaud la pré-bande pour obtenir une bande laminée à chaud ou laminer à chaud la pré-bande sans réchauffage à partir de la chaleur de coulée pour obtenir une bande laminée à chaud avec chauffage intermédiaire optionnel entre les passes de laminage individuelles du laminage à chaud,
    - bobiner la bande laminée à chaud à une température de bobinage comprise entre 850 °C et la température ambiante,
    - recuire éventuellement la bande laminée à chaud avec les paramètres suivants :
    température de recuit : 550 °C à 800 °C, durée de recuit : 20 à 80 min, refroidissement ultérieur à l'air,
    - effectuer un laminage final en une ou plusieurs étapes de la bande laminée à chaud ou de la pré-bande produite proche de la dimension finale avec une épaisseur inférieure à 3 mm pour obtenir une bande d'acier avec une épaisseur finale de 0,10 mm minimum,
    - puis recuire la bande d'acier avec les paramètres suivants :
    température de recuit: 900 à 1080 °C, durée de recuit: 10 à 60 secondes avec refroidissement ultérieur à l'air pour fixer une couche isolante comprenant sensiblement Al2O3 et/ou SiO2 sur la bande d'acier avec une épaisseur dans la gamme de 10 µm à 100 µm, de préférence dans la gamme de 20 µm à 100 µm, de manière particulièrement préférée dans la gamme de 20 µm à 50 µm.
  9. Procédé selon la revendication 8, caractérisé en ce que la bande laminée à chaud est chauffée à une température supérieure à la température ambiante avant d'effectuer le laminage final et est soumise, à cette température, à un laminage final à l'épaisseur finale prévue.
  10. Procédé selon la revendication 9, caractérisé en ce que la bande laminée à chaud est chauffée à une température de 350 à 570 °C, en particulier de 350 à 520 °C, avant d'effectuer le laminage final et est soumise, à cette température, à un laminage final à l'épaisseur finale prévue.
  11. Procédé selon les revendications 8 à 10, caractérisé en ce qu'un réchauffage à une température de 600 à 800 °C puis un refroidissement à la température de laminage sont effectués lors d'un laminage final à plusieurs étapes entre les étapes de laminage.
EP17745283.6A 2016-07-29 2017-07-13 Bande d'acier destinée à la fabrication d'une tôle pour circuits magnétiques à grains non orientés et procédé de fabrication d'une telle bande d'acier Active EP3491158B1 (fr)

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JP7415135B2 (ja) * 2019-11-15 2024-01-17 日本製鉄株式会社 無方向性電磁鋼板の製造方法
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US20190271053A1 (en) 2019-09-05
RU2715586C1 (ru) 2020-03-02
CN109477188B (zh) 2021-09-14
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KR20190034585A (ko) 2019-04-02
KR102364477B1 (ko) 2022-02-16
CN109477188A (zh) 2019-03-15
EP3491158A1 (fr) 2019-06-05
US11047018B2 (en) 2021-06-29

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