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RU-2026109657-A - GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET

RU2026109657ARU 2026109657 ARU2026109657 ARU 2026109657ARU-2026109657-A

Inventors

  • МАЦУБАРА Рио
  • КАВАМУРА Юсуке
  • Хонма Рей
  • СУДЗУМА Тосиюки

Assignees

  • НИППОН СТИЛ КОРПОРЕЙШН

Dates

Publication Date
20260505
Application Date
20240927
Priority Date
20230927

Claims (20)

  1. 1. A sheet of grain-oriented electrical steel containing on its surface a plurality of processing lines for controlling magnetic domains, in which:
  2. in the case where a rectangular evaluation region in which the length of the side parallel to the rolling direction of the grain-oriented electrical steel sheet is 50 mm and the length of the side parallel to the transverse direction of the grain-oriented electrical steel sheet is 100 mm is specified in the grain-oriented electrical steel sheet, and in addition, imaginary lines parallel to the transverse direction and having a length of 100 mm are specified in the evaluation region at intervals of 5 mm in the direction parallel to the rolling direction,
  3. on at least one of the imaginary lines, the standard deviation of the interval between the magnetic domain control points, which are the intersection points of the imaginary line and the processing line for controlling the magnetic domains, is 1.25 mm or more, and the average value |β L | of the absolute values of the angles β measured between the two magnetic domain control points, at which the interval becomes the absolute maximum value D L , is 1.5° or more.
  4. 2. A sheet of electrical steel with an oriented grain structure according to paragraph 1, in which:
  5. on each of the two or more imaginary lines, the standard deviation of the interval between the magnetic domain control points is 1.25 mm or more, and the average value |β L | of the absolute values of the angles β measured between the two magnetic domain control points at which the interval becomes the absolute maximum value D L is 1.5° or more.
  6. 3. A grain-oriented electrical steel sheet according to claim 1 or 2, wherein the ratio D L /D S between the absolute maximum value D L of the magnetic domain control point interval and the absolute minimum value D S of the magnetic domain control point interval is 2 or more.
  7. 4. A grain-oriented electrical steel sheet according to claim 3, wherein D L /D S is 4 or more.
  8. 5. A grain-oriented electrical steel sheet according to paragraph 3 or 4, in which
  9. |β L | and the average value |β S | of the absolute values of the angles β measured between two magnetic domain control points, in which the interval represents the absolute minimum value of D S , satisfy the following formula
  10. 0.5°≤|β L |-|β S |.
  11. 6. A grain-oriented electrical steel sheet according to any one of claims 1 to 5, wherein the processing line for controlling magnetic domains is thermal deformation.
  12. 7. A grain-oriented electrical steel sheet according to claim 6, wherein the absolute maximum value of the tensile stress introduced in the thermal deformation in the processing line for controlling magnetic domains is non-uniform at each point of tensile stress measurement.
  13. 8. A sheet of electrical steel with an oriented grain structure according to paragraph 7, in which
  14. in the case where a rectangular evaluation area in which the length of the side parallel to the rolling direction is 50 mm and the length of the side parallel to the transverse direction of the grain-oriented electrical steel sheet is 100 mm is specified on the surface, and in addition, imaginary lines parallel to the transverse direction and having a length of 100 mm are specified at intervals of 5 mm in the direction parallel to the rolling direction in the evaluation area,
  15. when each of the plurality of intersection points of the imaginary lines and the plurality of processing lines for controlling the magnetic domains is set as a magnetic domain control point, and the absolute maximum value of the tensile stress in MPa measured at each of the magnetic domain control points is set as TS m , and the variance of TS m is set as σ(TS m ) 2 , σ(TS m ) 2 >5.0 is satisfied.
  16. 9. A grain-oriented electrical steel sheet according to paragraph 7 or 8, in which:
  17. when TS m(β<2) is the arithmetic mean value of the absolute maximum values of the tensile stress in MPa introduced in thermal deformation measured at each of the magnetic domain control points having an angle β of less than 2° among the magnetic domain control points, and TS m(β≥2) is the arithmetic mean value of the absolute maximum values of the tensile stress in MPa introduced in thermal deformation measured at each of the magnetic domain control points having an angle β of 2° or more among the magnetic domain control points, TS m(β<2) >TS m(β≥2) is satisfied.
  18. 10. A grain-oriented electrical steel sheet according to any one of claims 1 to 5, wherein the processing line for controlling magnetic domains is a groove.
  19. 11. A grain-oriented electrical steel sheet according to claim 10, wherein the absolute maximum value of the groove depth on the processing line for controlling magnetic domains is non-uniform at each measurement point of the groove depth.
  20. 12. A sheet of electrical steel with an oriented grain structure according to paragraph 11, in which