WO2025070786A1 - 方向性電磁鋼板及びその製造方法 - Google Patents

方向性電磁鋼板及びその製造方法 Download PDF

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Publication number
WO2025070786A1
WO2025070786A1 PCT/JP2024/034811 JP2024034811W WO2025070786A1 WO 2025070786 A1 WO2025070786 A1 WO 2025070786A1 JP 2024034811 W JP2024034811 W JP 2024034811W WO 2025070786 A1 WO2025070786 A1 WO 2025070786A1
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WIPO (PCT)
Prior art keywords
magnetic domain
steel sheet
grain
electrical steel
oriented electrical
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PCT/JP2024/034811
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English (en)
French (fr)
Japanese (ja)
Inventor
稜 松原
悠祐 川村
励 本間
俊之 鈴間
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Nippon Steel Corp
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Nippon Steel Corp
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Priority to CN202480061150.5A priority Critical patent/CN121925484A/zh
Priority to JP2025549216A priority patent/JPWO2025070786A1/ja
Publication of WO2025070786A1 publication Critical patent/WO2025070786A1/ja
Anticipated expiration legal-status Critical
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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • 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
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • Grain-oriented electrical steel sheet is a steel sheet that contains 7 mass% or less of Si and has a secondary recrystallized texture in which secondary recrystallized grains are concentrated in the ⁇ 110 ⁇ 001> orientation (Goss orientation) with the magnetization easy axis ⁇ 001> oriented in the rolling direction.
  • Grain-oriented electrical steel sheet is mainly used as the iron core of power transformers. Reduction of energy loss (iron loss) is required for grain-oriented electrical steel sheet.
  • a technique for narrowing the magnetic domain width of grain-oriented electromagnetic steel sheets has long been known in order to reduce iron loss.
  • the magnetic domain width can be narrowed by irradiating the surface of the grain-oriented electromagnetic steel sheet with a laser or electron beam in a direction intersecting the rolling direction to introduce thermal distortion.
  • the magnetic domain width can also be narrowed by forming grooves on the surface of the grain-oriented electromagnetic steel sheet in a direction intersecting the rolling direction.
  • Methods for forming grooves include a method of irradiating with a laser or electron beam, a method using mechanical processing such as gears, and a method using chemical processing such as etching.
  • the calculation unit 41 has a Central Processing Unit (CPU).
  • the calculation unit 41 analyzes the magnetic domain structure from the magnetic domain image of the original plate according to a program stored in the memory 43. The calculation unit 41 then determines the processing area where the magnetic domain control processing is applied. The processing executed by the calculation unit 41 will be described in detail later.
  • FIG. 6 shows the configuration of the laser irradiation device 500.
  • the laser irradiation device 500 includes a polygon mirror 501, a light source device 503, a collimator 505, a condenser lens 507, a motor 509, a sensor 511, a control unit 513, and a plate threading device 515.
  • the plate threading device 515 threads the original plate in the rolling direction RD.
  • the light source device 503 outputs a laser beam LB in a predetermined irradiation method (e.g., continuous irradiation method or pulse irradiation method) under the control of the control unit 513.
  • a predetermined irradiation method e.g., continuous irradiation method or pulse irradiation method
  • the control unit 513 is composed of a processor.
  • the control unit 513 is connected to the light source device 503, the motor 509, the sensor 511, and the plate threading device 515.
  • the control unit 513 receives a speed signal from the plate threading device 515. Furthermore, the control unit 513 outputs a signal to the motor 509 to instruct the motor 509 to rotate the polygon mirror 501.
  • the process for identifying the processing area is performed, for example, by the calculation unit 41 of the analysis device 40.
  • Fig. 3A shows an example of the distribution of magnetic domain widths of the grain-oriented electrical steel sheet 1 before magnetic domain control treatment, obtained by further analyzing a magnetic domain image acquired by a CMOS-MagView manufactured by Matesy GmbH with a two-dimensional Fourier transform.
  • Fig. 3B shows the distribution of magnetic domain widths after magnetic domain control treatment was performed on the surface of the grain-oriented electrical steel sheet 1 of Fig. 3A, obtained in the same manner as Fig. 3A.
  • the magnetic domain control treatment here was performed by irradiating the surface with a continuous wave laser in a direction substantially perpendicular to the rolling direction RD.
  • the units of numerical values are ⁇ m.
  • the calculation unit 41 executes the following processes (A-1), (A-2) and (A-3).
  • A-1 Processing for cutting out a plurality of partial regions from a magnetic domain image
  • A-2 Processing for performing ST2DFT
  • A-3 Processing for deriving the distribution of magnetic domain widths The following describes the processing of A-1 to A-3 in detail.
  • (A-1) Processing for Cutting out Multiple Partial Regions from a Magnetic Domain Image In order to cut out multiple partial regions from a magnetic domain image and analyze the frequency structure of each partial region, a rectangular window function Wa(k,l) is used in which the range in the k direction is 0 ⁇ k ⁇ N k -1 and the range in the l direction is 0 ⁇ l ⁇ N l-1 (N k and N l are natural numbers).
  • the window function Wa(k,l) a Hamming window, a Hanning window, a Blackman window, etc. can be used.
  • N k and N l that define the range of the window function Wa(k, l) are parameters that correspond to the number of pixels in the k direction and the number of pixels in the l direction, respectively, in the partial region.
  • ⁇ k and ⁇ l are the spatial resolutions in the k and l directions, respectively, of the magnetic domain image.
  • the distribution of magnetic domain widths L(n, m) is derived from the spatial frequency resolution defined in equation (3) and the peak positions of the spots in the partial Fourier image, as shown in equation (4).
  • the calculation unit 41 determines the areas where the magnetic domain width is equal to or greater than a predetermined value as the processing areas (i.e., the areas to which the magnetic domain control processing is applied).
  • the control unit 513 of the laser irradiation device 500 turns on the power of the laser beam LB for the processing areas, and preferably controls the power of the laser beam LB to be turned off for areas other than the processing areas. This introduces the magnetic domain control processing lines 11 into the processing areas of the original sheet. Furthermore, the introduction of the magnetic domain control processing lines 11 is suppressed in other areas.
  • the above-mentioned procedure can also be used to obtain a magnetic domain image of the grain-oriented electromagnetic steel sheet 1 after the magnetic domain control process.
  • the magnetic domain control process lines 11 may be unclear.
  • the observation conditions may be adjusted so that the magnetic domain control process lines 11 can be clearly seen.
  • the magnetic domain control process lines 11 can be made clear by applying a DC magnetic field along the direction perpendicular to the sheet surface (thickness direction) of the grain-oriented electromagnetic steel sheet 1.
  • an insulating coating forming step may be performed by a known method after the final annealing.
  • the insulating coating forming step may be performed before the magnetic domain control processing line forming step or after the magnetic domain control processing line forming step, as long as it is performed after the final annealing.
  • the insulating coating may peel off from the magnetic domain control processing line 11, so it is preferable to perform the insulating coating after the magnetic domain control processing line forming step.
  • the insulating coating forming step is performed before the magnetic domain control processing line forming step, it is preferable to form an insulating coating again on the magnetic domain control processing line 11 after the magnetic domain control processing line forming step.
  • Example 1 A grain-oriented electrical steel sheet of the same lot having a thickness of 0.20 mm was used as the original sheet.
  • the original sheet was subjected to magnetic domain control processing so as to have the types and shapes of magnetic domain control processing lines shown in Table 1.
  • the shapes of magnetic domain control processing lines A to E and A-2 in the table indicate the following.
  • B A linear magnetic domain control processing line was formed across the entire width of the original sheet.
  • C Regularly dotted magnetic domain control processing lines were formed.
  • D Randomly dotted magnetic domain control processing lines were formed.
  • Magnetic domain control treatment lines were formed at intervals of 4 mm only in the region within ⁇ 4 mm in the rolling direction RD from the center of each crystal grain in the rolling direction. The radius of curvature of the steel sheet at the position where the crystal grain was located during final annealing was 250 mm.
  • A-2 A linear magnetic domain control processing line including curves was formed in an area where the magnetic domain width exceeded a predetermined value (500 ⁇ m). The regions with a magnetic domain width of more than 500 ⁇ m were identified by the method described above.
  • the noise and iron loss were evaluated as follows. First, a three-phase transformer core was made by stacking 205 grain-oriented electromagnetic steel sheets with a thickness of 0.20 mm. The widths of the legs and yoke of the three-phase transformer core were both 150 mm. The external height and width of the three-phase transformer core were both 750 mm. The noise and iron loss of these three-phase transformer cores were measured. The measurement conditions were a frequency of 50 Hz and an excitation magnetic flux density of 1.5 T.
  • noise evaluation results (unit: dBA) for the grain-oriented electrical steel sheet. Examples with a noise evaluation result of 25.1 dBA or less were determined to be examples in which low noise had been achieved. Noise evaluation results that were determined to be unsatisfactory are underlined.
  • the iron loss was determined by measuring the voltage and current on the primary and secondary sides with a power analyzer when excitation was performed at a frequency of 50 Hz and an excitation magnetic flux density of 1.5 T.
  • the determined iron loss is shown in Table 2 as the iron loss evaluation results (units: W/kg) of the grain-oriented electrical steel sheet. Examples with an iron loss evaluation result of 0.580 W/kg or less were determined to be examples in which low iron loss had been achieved. Noise evaluation results that were determined to be unsatisfactory are underlined.
  • Example 2 Grain-oriented electrical steel sheets (grain-oriented electrical steel sheets having coarse crystal grain sizes) of the same lot with a sheet thickness of 0.20 mm were used as the original sheets.
  • the average heating rate from 1000°C to 1200°C during the temperature rise process of the finish annealing was set to less than 5°C/hour, so that the average grain boundary spacing in the rolling direction RD was 31 mm to 40 mm.
  • the original sheet was subjected to magnetic domain control processing so as to have the types and shapes of magnetic domain control processing lines shown in Table 3.
  • the shapes of magnetic domain control processing lines A to E and A-2 in the table indicate the following.
  • a linear magnetic domain control processing line was formed across the entire width of the original sheet.
  • C Regularly dotted magnetic domain control processing lines were formed.
  • D Randomly dotted magnetic domain control processing lines were formed.
  • E Magnetic domain control treatment lines were formed at intervals of 4 mm only in the region within ⁇ 4 mm in the rolling direction RD from the center of each crystal grain in the rolling direction. The radius of curvature of the steel sheet at the position where the crystal grain was located during final annealing was 250 mm.
  • A-2 A linear magnetic domain control processing line including curves was formed in an area where the magnetic domain width exceeded a predetermined value (500 ⁇ m). The regions with a magnetic domain width exceeding 500 ⁇ m were identified in the same manner as in Example 1.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)
PCT/JP2024/034811 2023-09-27 2024-09-27 方向性電磁鋼板及びその製造方法 Pending WO2025070786A1 (ja)

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CN202480061150.5A CN121925484A (zh) 2023-09-27 2024-09-27 取向性电磁钢板及其制造方法
JP2025549216A JPWO2025070786A1 (https=) 2023-09-27 2024-09-27

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11124629A (ja) * 1997-10-16 1999-05-11 Kawasaki Steel Corp 低鉄損・低騒音方向性電磁鋼板
JPH11293340A (ja) * 1998-04-08 1999-10-26 Kawasaki Steel Corp 低鉄損方向性電磁鋼板及びその製造方法
JP2000345306A (ja) * 1999-05-31 2000-12-12 Nippon Steel Corp 高磁場鉄損の優れた高磁束密度一方向性電磁鋼板
JP2012012664A (ja) 2010-06-30 2012-01-19 Jfe Steel Corp 方向性電磁鋼板の製造方法
JP2012057219A (ja) 2010-09-09 2012-03-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012057218A (ja) 2010-09-09 2012-03-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012067349A (ja) * 2010-09-22 2012-04-05 Jfe Steel Corp 方向性電磁鋼板の製造方法
KR20170074608A (ko) * 2015-12-22 2017-06-30 주식회사 포스코 방향성 전기강판 및 그 제조방법
JP2020169373A (ja) * 2019-04-05 2020-10-15 日本製鉄株式会社 方向性電磁鋼板
JP2022515236A (ja) * 2018-12-19 2022-02-17 ポスコ 方向性電磁鋼板およびその製造方法
WO2023190331A1 (ja) * 2022-03-28 2023-10-05 日本製鉄株式会社 方向性電磁鋼板及びその製造方法
JP2023166097A (ja) 2022-05-09 2023-11-21 株式会社イメージ・マジック 熱プレス機及び熱プレス方法

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11124629A (ja) * 1997-10-16 1999-05-11 Kawasaki Steel Corp 低鉄損・低騒音方向性電磁鋼板
JPH11293340A (ja) * 1998-04-08 1999-10-26 Kawasaki Steel Corp 低鉄損方向性電磁鋼板及びその製造方法
JP2000345306A (ja) * 1999-05-31 2000-12-12 Nippon Steel Corp 高磁場鉄損の優れた高磁束密度一方向性電磁鋼板
JP2012012664A (ja) 2010-06-30 2012-01-19 Jfe Steel Corp 方向性電磁鋼板の製造方法
JP2012057219A (ja) 2010-09-09 2012-03-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012057218A (ja) 2010-09-09 2012-03-22 Jfe Steel Corp 方向性電磁鋼板およびその製造方法
JP2012067349A (ja) * 2010-09-22 2012-04-05 Jfe Steel Corp 方向性電磁鋼板の製造方法
KR20170074608A (ko) * 2015-12-22 2017-06-30 주식회사 포스코 방향성 전기강판 및 그 제조방법
JP2022515236A (ja) * 2018-12-19 2022-02-17 ポスコ 方向性電磁鋼板およびその製造方法
JP2020169373A (ja) * 2019-04-05 2020-10-15 日本製鉄株式会社 方向性電磁鋼板
WO2023190331A1 (ja) * 2022-03-28 2023-10-05 日本製鉄株式会社 方向性電磁鋼板及びその製造方法
JP2023166097A (ja) 2022-05-09 2023-11-21 株式会社イメージ・マジック 熱プレス機及び熱プレス方法

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