WO2015129253A1 - Feuille d'acier électromagnétique orientée pour un transformateur à faible bruit, et procédé de fabrication de ladite feuille - Google Patents

Feuille d'acier électromagnétique orientée pour un transformateur à faible bruit, et procédé de fabrication de ladite feuille Download PDF

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WO2015129253A1
WO2015129253A1 PCT/JP2015/000931 JP2015000931W WO2015129253A1 WO 2015129253 A1 WO2015129253 A1 WO 2015129253A1 JP 2015000931 W JP2015000931 W JP 2015000931W WO 2015129253 A1 WO2015129253 A1 WO 2015129253A1
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irradiation
steel sheet
region
modulated
area
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PCT/JP2015/000931
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English (en)
Japanese (ja)
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広朗 戸田
重宏 ▲高▼城
龍一 末廣
小松原　道郎
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Ｊｆｅスチール株式会社
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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
    • C21D8/1294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localized treatment
    • 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
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation

Definitions

  • the present invention relates to a grain-oriented electrical steel sheet for a low noise transformer and a method for manufacturing the same.
  • a technique for subdividing the magnetic domains of grain-oriented electrical steel sheets there is a technique in which the effect does not disappear even when strain relief annealing is performed, such as forming grooves on the steel sheet surface.
  • the present invention is an electron known as one of techniques for subdividing magnetic domains and reducing iron loss by introducing strain into the steel sheet surface layer such as laser irradiation, plasma jet flame irradiation, and marking. It is a technique that uses a beam irradiation method, and is particularly intended to simultaneously achieve low iron loss and low magnetostriction.
  • Patent Document 1 discloses a method for manufacturing a grain-oriented electrical steel sheet having a magnetic flux density B 8 exceeding 1.97T.
  • the iron loss can be improved by increasing the purity of the material, high orientation, reducing the plate thickness, adding Si, Al, and subdividing the magnetic domain (for example, Non-Patent Document 1).
  • the iron loss tends to deteriorate.
  • the crystal orientation is highly integrated in the Goss orientation for the purpose of improving B 8
  • the magnetostatic energy decreases, the domain width increases, and the eddy current loss increases. Therefore, as a method of reducing such eddy current loss, a technique is used in which the above-described tension coating is applied, or a magnetic domain is subdivided by introducing thermal strain into the steel sheet surface layer to reduce iron loss. .
  • Patent Document 3 discloses that laser scanning irradiation is performed under certain conditions to impart thermal strain to the steel sheet
  • Patent Document 4 discloses a pulse Q-switched laser having a half width of 10 nsec or more and 1 ⁇ sec or less.
  • a technology to reduce iron loss by subdividing magnetic domains by concentrating the light intensity of 1 ⁇ 10 5 to 1 ⁇ 10 8 W / cm 2 and intermittently applying thermal strain to the steel sheet is disclosed. Has been.
  • Patent Document 5 describes that a hardened region generated in a steel sheet surface layer by laser irradiation or the like, that is, a plastic strain region obstructs domain wall movement and increases hysteresis loss.
  • the strain concentrates locally on a part of the surface layer of the steel sheet, and the effect of reducing iron loss is not sufficient, and the effect of reducing iron loss is insufficient due to the increase in hysteresis loss due to strain.
  • magnetostriction due to strain increased.
  • Patent Document 5 the laser output and the spot diameter ratio are adjusted, the plastic strain region cured by laser irradiation in the direction perpendicular to the laser scanning direction is reduced to 0.6 mm or less, and the hysteresis loss is reduced. By reducing this, iron loss is reduced.
  • the plastic strain on the surface of the steel sheet causes an increase in magnetostriction, and as a result, the noise of the transformer increases.
  • Patent Document 8 the current value of the electron beam to be irradiated, the traveling speed of the electron beam in the width direction of the steel plate, the irradiation pitch in the rolling direction, and the beam diameter of the electron beam are controlled within a certain range. Discloses a technology for obtaining a grain-oriented electrical steel sheet that is excellent in noise and iron loss by suppressing the occurrence of thermal distortion.
  • Non-Patent Document 2 when the magnetic domain of a grain-oriented electrical steel sheet is subdivided by laser light irradiation, the interaction between the laser light and the surface film is strong, which is accompanied by rapid thermal deformation of the steel sheet near the irradiated surface or rapid evaporation of the film. Due to the reaction force on the steel plate, a region with a higher dislocation density is formed on the steel plate near the irradiated portion. As a result, it has been shown that the hardness of the steel sheet increases, and at the same time, the steel sheet is deformed to increase the hysteresis loss (for example, Non-Patent Document 2).
  • forming a 90 ° magnetic domain in the steel sheet by forming a region with a higher dislocation density in the vicinity of the irradiated part of the steel sheet surface layer is the basic principle of magnetic domain subdivision by this technology.
  • Accompanying the reduction is necessarily accompanied by an increase in hysteresis loss and an increase in magnetostriction. That is, as long as it is a technology for irradiating laser light utilizing thermal distortion as in the prior art, it is not possible to establish all of magnetic domain subdivision, low hysteresis loss, and low magnetostriction.
  • the inventors considered that, in general, when an electron beam is irradiated onto a steel sheet, it is possible to find an optimum condition common to both iron loss and magnetostriction by adjusting the energy density of the irradiated portion. That is, the beam irradiation linear density ⁇ disclosed in Patent Document 8 corresponds to this, and a magnetic domain subdividing effect can be obtained by increasing the value of ⁇ from a predetermined minimum value, and by reducing the value from the maximum value, a steel plate It was thought that the plastic strain of the surface layer could be reduced, and as a result, the increase in hysteresis loss and noise could be suppressed.
  • the required electron beam irradiation energy intensity is such that the irradiation is performed at an intensity higher than the level at which the magnetic domains elongated and divided in the direction of the irradiation line exist in the electron beam irradiation line region, and the occurrence of thermal distortion on the steel sheet surface is suppressed. It has been clarified that it is an essential technique to suppress the occurrence of film damage on the irradiation side surface of the steel sheet and to perform irradiation at a strength level that does not form a plastic strain region.
  • Table 1 shows that the acceleration voltage Vk is 40 kV to 120 kV and the beam is radiated to the directional electrical steel sheet with a plate thickness of 0.23 mm, B 8 of 1.943 T, and iron loss W 17/50 of 0.85 W / kg.
  • the lower limit value of the energy density of the irradiated portion includes a divided magnetic domain elongated in the irradiation direction (Non-Patent Document 3).
  • the upper limit value of the energy density is an upper limit value at which damage to the coating does not occur.
  • modulated irradiation is performed by repeatedly irradiating a total area of 0.50 mm of a beam residence area: 1 and a traveling area: 2 as a repeating unit: 3 (which is also a period of the repeating unit) in the width direction of the steel sheet. Irradiation was performed under irradiation conditions (condition 2) for forming a line region. At this time, the dwell time at the dwell point was 0.020 msec, and the running speed in the running region: 2 was adjusted so that the average scanning speed was 25 m / sec.
  • FIG. 2 shows the results of examining the relationship between the distance L in the rolling direction of the irradiated region and the iron loss and magnetostriction when the electron beam irradiation is performed under the above conditions 1 and 2.
  • the gist configuration of the present invention is as follows. 1.
  • the surface of the steel sheet is irradiated with an electron beam in a line area in a direction intersecting the rolling direction, the irradiation line area is set as a modulated irradiation line area having two types of areas consisting of a stay area and a running area as repeating units, and
  • a modulated irradiation region in which the repeating units are connected in the direction of the line region A modulated irradiation region in which the repeating units are connected in the direction of the line region,
  • the period in the modulated irradiation region of the repeating unit is 0.20 to 1.0 mm
  • the repetition interval in the rolling direction of the modulated irradiation region is set to 4.0 to 12.5 mm, and the intensity of the electron beam is at least equal to or more than the strength at which the elongated magnetic domains extending in the direction of the modulated irradiation region are formed on the i
  • the surface of the steel sheet is irradiated with an electron beam in a line area in a direction intersecting the rolling direction, the irradiation line area is set as a modulated irradiation line area having two types of areas consisting of a stay area and a running area as repeating units, and
  • a modulated irradiation region in which the repeating units are connected in the direction of the line region A modulated irradiation region in which the repeating units are connected in the direction of the line region,
  • the period in the modulated irradiation region of the repeating unit is 0.20 to 1.0 mm
  • the repetition interval in the rolling direction of the modulated irradiation region is set to 4.0 to 12.5 mm, and the intensity of the electron beam is at least equal to or more than the strength at which the elongated magnetic domains extending in the direction of the modulated irradiation region are formed on the irradiation surface side.
  • the present invention it is possible to carry out magnetic domain subdivision processing under conditions that satisfy both the low iron loss and low noise of the transformer, which has been difficult in the past, and the direction of low magnetostriction with low iron loss that has not been achieved conventionally. Since the electromagnetic steel sheet can be obtained, the energy use efficiency in the transformer can be improved and the noise can be suppressed, which is extremely useful industrially.
  • the irradiation object in the present invention is a grain-oriented electrical steel sheet.
  • the grain-oriented electrical steel sheet is provided with an insulation coating such as a tension coating on the forsterite film on the ground iron.
  • the forsterite film is provided between the ground iron and the insulation coating. There is no problem even if is not present.
  • the magnetic domain refinement process is performed by scanning the surface of the grain-oriented electrical steel sheet with an electron beam in a direction intersecting with the rolling direction and at intervals in the rolling direction.
  • the introduction means is limited to electron beam irradiation.
  • the interaction with the insulation coating existing on the surface of the steel plate is large, and the damage of the insulation coating and the plastic strain consisting of high dislocation density are introduced into the surface layer of the underlying iron, so the deterioration of hysteresis loss, That is, the iron loss is deteriorated and the best iron loss characteristic cannot be obtained.
  • the interaction with the insulating coating is limited to a small size due to the dynamic action of the electron beam, and the interaction with the ground iron inside the steel plate is increased. Therefore, it is possible to impart the magnetic domain refinement effect without damage of the insulating coating, the forsterite film, or the introduction of plastic strain having a high dislocation density in the surface layer of the base iron immediately below the coating.
  • the steel plate surface irradiated with the electron beam may be one side of the steel plate or both sides.
  • the direction intersecting the rolling direction is a direction perpendicular to the rolling direction, that is, a range of 75 ° to 105 ° when the sheet width direction of the steel sheet is 90 °. It is suitably exhibited.
  • reference numeral 1 is a staying region
  • 2 is a traveling region
  • 3 is a repeating unit (spacing point interval)
  • d indicates a beam diameter.
  • the period of the repeating unit in the modulated irradiation region needs to be 0.20 to 1.0 mm.
  • the period of this repeating unit is 0.20 to 1.0 mm.
  • the range is preferably 0.25 to 0.80 mm.
  • the repetition interval in the rolling direction of the above-described modulated irradiation region needs to be 4.0 to 12.5 mm.
  • the repetition interval in the rolling direction of the modulated irradiation region is less than 4.0 mm, the iron loss increases as shown in FIG. 2, and the magnetostriction also deteriorates.
  • the repeat interval in the rolling direction must be 4.0 to 12.5 mm.
  • the range is preferably 5.0 to 10 mm.
  • the beam diameter d of the electron beam is not particularly limited. However, if the beam diameter d is too small, it is disadvantageous for the generation of the divided magnetic domain, while if too large, the divided magnetic domain is excessively generated.
  • the diameter d is preferably about 0.05 to 0.5 mm.
  • the acceleration voltage of the electron beam is not particularly limited, but if the acceleration voltage is too small, the penetration of electrons into the steel plate is insufficient, while if too large, the electron gun or the power source Since the manufacturing cost of equipment and the like becomes large, the acceleration voltage is preferably about 30 to 300 kV.
  • the outer shape of the transformer is composed of a steel plate having a 500 mm square and a width of 100 mm. Cut the steel plate into the shape shown in Fig. 5 and stack it with a stacking thickness of 100mm, tighten it with a band, and then wind the secondary coil and primary coil around the legs of the steel plate and put it in a tank filled with insulating oil The measurement was carried out by connecting the measuring instrument.
  • the three phases are excited by using a primary coil with a 120 ° phase shift, and the cross-sectional area is obtained from the weight of the iron core generated from the induced voltage generated in the secondary coil. It was measured.
  • the noise was expressed in dBA units where vibrations generated around the transformer were recorded with a microphone and A scale correction was performed.
  • the iron loss was expressed as a loss per weight of the transformer by subtracting the copper loss from the voltage and current value on the primary coil side in the unloaded state with the secondary coil open.
  • Example 1 Has a forsterite film on the steel sheet surface, the sheet thickness was baked tension coating thereon: 0.23 mm, the magnetic flux density B 8: 1.942T, iron loss W 17/50: oriented electrical steel sheet 0.870W / kg 6
  • magnetic domain subdivision means electron beam irradiation with acceleration voltage: 60kV, beam current: 12mA, beam diameter: 0.30mm is used, and irradiation is performed continuously at a scanning speed of 40m / sec under constant irradiation conditions in the plate width direction. And one was irradiated with an interval in the rolling direction of 5.0 mm (Comparative Example A1) and the other was 7.5 mm (Comparative Example A2). In these comparative examples, a part where the coating partly peeled off was confirmed.
  • the other two were irradiated with an electron beam under the same conditions as above, but the residence time was 0.010 msec, the residence point interval was 0.40 mm, and the residence unit and the running region were repeated units. And a modulated irradiation region was formed at an average scanning speed of 40 m / sec. At this time, one was irradiated with a repetition interval in the rolling direction of 5.0 mm (Invention Example A3), and the other was 7.5 mm (Invention Example A4). In these inventive examples, no damage to the coating was observed, and magnetic domains that were elongated and divided in the plate width direction were observed on the irradiated region by magnetic domain observation by the bitter method.
  • the remaining two were subjected to discontinuous pulse irradiation in the plate width direction of the steel sheet using an Nd: YAG laser device equipped with a Q switch.
  • the irradiation conditions at this time are conventionally known conditions, that is, the laser pulse energy is 3.3 mJ / pulse, the laser spot size is a circle with a diameter of 0.18 mm, the irradiation interval in the plate width direction is 0.3 mm, and the laser wavelength is 1064 nm. It was.
  • One irradiation interval in the rolling direction was 5.0 mm (Comparative Example A5), and the other was 7.5 mm (Comparative Example A6).
  • a clear circular coating defect and bare iron bareness were observed in the place where the laser beam was received, so the insulating coating was thinly reapplied and baked at a low temperature to improve insulation. .
  • the grain-oriented electrical steel sheet subjected to magnetic domain subdivision according to the present invention is superior in iron loss characteristics and magnetostriction characteristics and also in transformer iron loss and noise characteristics as compared with the comparative example. ing. Furthermore, it should be noted that when the irradiation interval in the rolling direction is set to 7.5 mm, unlike the comparative example, both the iron loss and the noise show the best values, and it is excellent as a grain-oriented electrical steel sheet for a transformer. It turns out that it has an effect.
  • Example 2 Has a forsterite film on the steel sheet surface, the sheet thickness was baked tension coating thereon: 0.27 mm, the magnetic flux density B 8: 1.949T, iron loss W 17/50: oriented electrical steel sheet 0.903W / kg 6
  • magnetic domain subdivision means electron beam irradiation with acceleration voltage: 50kV, beam current: 12mA, beam diameter: 0.20mm is used, and irradiation is continuously performed at a scanning speed of 30m / sec under constant irradiation conditions in the plate width direction. And one was irradiated with an interval in the rolling direction of 5.0 mm (Comparative Example B1) and the other was 7.5 mm (Comparative Example B2). In these comparative examples, a part where the coating partly peeled off was confirmed.
  • the other two were irradiated with an electron beam under the same conditions as above, but the residence time: 0.010 msec and the residence point interval: 0.30 mm was used as the repeat unit for the residence region and travel region, and the repeat unit in the plate width direction. And a modulated irradiation region was formed at an average scanning speed of 30 m / sec. At this time, one was irradiated with a repetition interval in the rolling direction of 5.0 mm (Invention Example B3), and the other was 7.5 mm (Invention Example B4). In these inventive examples, no damage to the coating was observed, and magnetic domains that were elongated and divided in the plate width direction were observed on the irradiated region by magnetic domain observation by the bitter method.
  • the remaining two were subjected to discontinuous pulse irradiation in the plate width direction of the steel sheet using an Nd: YAG laser device equipped with a Q switch.
  • the irradiation conditions at this time are conventionally known conditions, that is, the laser pulse energy is 4.5 mJ / pulse, the laser spot size is a circle with a diameter of 0.22 mm, the irradiation interval in the plate width direction is 0.3 mm, and the laser wavelength is 1064 nm. It was.
  • One irradiation interval in the rolling direction was 5.0 mm (Comparative Example B5), and the other was 7.5 mm (Comparative Example B6). In these comparative examples, a clear circular coating defect and bare iron bareness were observed in the place where the laser beam was received, so the insulation coating was thinly reapplied and baked at a low temperature to improve insulation. It was.
  • the grain-oriented electrical steel sheet subjected to magnetic domain subdivision according to the present invention is superior in iron loss characteristics and magnetostriction characteristics as compared with the comparative example, and also excellent in iron loss and noise characteristics of the transformer. ing. Furthermore, it should be noted that when the irradiation interval in the rolling direction is 7.5 mm, unlike the comparative example, both the iron loss and the noise show the best values, which is excellent as a grain-oriented electrical steel sheet for a transformer. It turns out that it has an effect.

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Abstract

　L'invention concerne une feuille d'acier électromagnétique orientée traitée à l'aide d'une segmentation de domaine magnétique où la surface de la feuille d'acier est irradiée avec un faisceau d'électrons dans une zone de ligne ayant une direction qui croise la direction de laminage, la zone de ligne de rayonnement étant réalisée sous la forme d'unités de répétition constituées de deux types de zones comprenant une zone de rétention et une zone de déplacement ; des zones de ligne de rayonnement modulé étant obtenues par raccordement des unités de répétition dans la direction de zone de ligne ; la période des unités de répétition dans la zone de ligne de rayonnement modulé variant entre 0,20 et 1,0 mm ; l'intervalle de répétition de la zone de ligne de rayonnement modulé dans la direction de laminage variant entre 4,0 et 12,5 mm ; et l'intensité du faisceau d'électrons étant amenée à un niveau égal ou supérieur à celui auquel des domaines magnétiques divisés sont formés en s'étendant dans la direction de la zone de ligne de rayonnement modulé au moins côté surface de rayonnement, et jusqu'à un niveau auquel le revêtement n'est pas endommagé et aucune zone de déformation plastique n'est formée côté surface de rayonnement. Il est ainsi possible de mettre en œuvre un procédé de segmentation de domaine magnétique, jusqu'à présent difficilement réalisable, dans un transformateur dans lequel la perte de fer et le bruit sont tous les deux faibles, et d'obtenir une feuille d'acier électromagnétique orientée qui présente une faible perte de fer et une faible distorsion magnétique sans précédent.
PCT/JP2015/000931 2014-02-28 2015-02-24 Feuille d'acier électromagnétique orientée pour un transformateur à faible bruit, et procédé de fabrication de ladite feuille WO2015129253A1 (fr)

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JP2014038943A JP2015161017A (ja) 2014-02-28 2014-02-28 低騒音変圧器用の方向性電磁鋼板およびその製造方法
JP2014-038943 2014-02-28

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2019182154A1 (fr) 2018-03-22 2019-09-26 日本製鉄株式会社 Tôle d'acier électrique à grains orientés et procédé de fabrication de tôle d'acier électrique à grains orientés
JP2020009910A (ja) * 2018-07-09 2020-01-16 東芝産業機器システム株式会社 静止誘導機器用積層鉄心及びその製造方法並びに静止誘導機器

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JP2012036445A (ja) * 2010-08-06 2012-02-23 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012036450A (ja) * 2010-08-06 2012-02-23 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012172191A (ja) * 2011-02-21 2012-09-10 Jfe Steel Corp 方向性電磁鋼板の製造方法
WO2013046716A1 (fr) * 2011-09-28 2013-04-04 Ｊｆｅスチール株式会社 Plaque d'acier électromagnétique directionnelle et son procédé de fabrication
JP2013072116A (ja) * 2011-09-28 2013-04-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
WO2013100200A1 (fr) * 2011-12-28 2013-07-04 Ｊｆｅスチール株式会社 Plaque d'acier électromagnétique orientée et son procédé de fabrication

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Publication number Priority date Publication date Assignee Title
JP2012036445A (ja) * 2010-08-06 2012-02-23 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012036450A (ja) * 2010-08-06 2012-02-23 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012172191A (ja) * 2011-02-21 2012-09-10 Jfe Steel Corp 方向性電磁鋼板の製造方法
WO2013046716A1 (fr) * 2011-09-28 2013-04-04 Ｊｆｅスチール株式会社 Plaque d'acier électromagnétique directionnelle et son procédé de fabrication
JP2013072116A (ja) * 2011-09-28 2013-04-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
WO2013100200A1 (fr) * 2011-12-28 2013-07-04 Ｊｆｅスチール株式会社 Plaque d'acier électromagnétique orientée et son procédé de fabrication

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019182154A1 (fr) 2018-03-22 2019-09-26 日本製鉄株式会社 Tôle d'acier électrique à grains orientés et procédé de fabrication de tôle d'acier électrique à grains orientés
KR20200121873A (ko) 2018-03-22 2020-10-26 닛폰세이테츠 가부시키가이샤 방향성 전자 강판 및 방향성 전자 강판의 제조 방법
US11562840B2 (en) 2018-03-22 2023-01-24 Nippon Steel Corporation Grain-oriented electrical steel sheet and method for producing grain-oriented electrical steel sheet
JP2020009910A (ja) * 2018-07-09 2020-01-16 東芝産業機器システム株式会社 静止誘導機器用積層鉄心及びその製造方法並びに静止誘導機器

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