Title:
GRAIN-ORIENTED ELECTRICAL STEEL SHEET WITH EXCELLENT MAGNETIC CHARACTERISTICS
Document Type and Number:
WIPO Patent Application WO/2019/245044
Kind Code:
A1
Abstract:
Provided is a grain-oriented electrical steel sheet, the iron loss characteristics of which have been significantly improved without causing a deterioration in magnetic flux density. The grain-oriented electrical steel sheet: comprises 2.5-3.5% by mass of Si with the balance being Fe and inevitable impurities; has a sheet thickness of 0.18-0.35 mm; has a metallographic structure including matrix grains of Goss-oriented secondary recrystallized grains after final annealing, wherein Goss-oriented crystal grains existing in the matrix and having a major diameter of 5 mm or smaller exist in the metallographic structure at a frequency of 1.5 grains/cm2 to 8 grains/cm2; and has a magnetic flux density B8 of 1.88T or greater. As for the orientations of the Goss-oriented crystal grains having a major diameter of 5 mm or smaller, the <100> orientation of the Goss-oriented crystal grains deviate from the rolling direction by an angle of 7 degrees or smaller and by an angle of 5 degrees or smaller in terms of a simple average of an α angle and that of a β angle, respectively. α angle: an angle between the longitudinal direction (rolling direction) and the [001] axis and orientation of the Goss-oriented grain as projected on a rolled surface of a test piece. β angle: an angle formed by the [001] axis of the Goss-oriented crystal grain with respect to the rolled surface.
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Inventors:
KUMANO TOMOJI (JP)
YANO SHINYA (JP)
OKADA SHINGO (JP)
OGURI AKIO (JP)
MORIMOTO SHOTA (JP)
YANO SHINYA (JP)
OKADA SHINGO (JP)
OGURI AKIO (JP)
MORIMOTO SHOTA (JP)
Application Number:
PCT/JP2019/024818
Publication Date:
December 26, 2019
Filing Date:
June 21, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/02; H01F1/147; C21D8/12; C22C38/60
Foreign References:
| JPH06100996A | 1994-04-12 | |||
| JPH08213225A | 1996-08-20 | |||
| JPH0689805A | 1994-03-29 | |||
| JPH06220541A | 1994-08-09 | |||
| JP2002220644A | 2002-08-09 | |||
| JP2012087374A | 2012-05-10 | |||
| JPH0631303A | 1994-02-08 | |||
| KR20130014892A | 2013-02-12 | |||
| JPS5518566A | 1980-02-08 | |||
| JPS61117218A | 1986-06-04 | |||
| JPS59197520A | 1984-11-09 | |||
| JPS3304710A | ||||
| JPS5956522A | 1984-04-02 | |||
| JPH09287025A | 1997-11-04 | |||
| JPS5823414A | 1983-02-12 | |||
| JP2000199015A | 2000-07-18 | |||
| JPH0680172B2 | 1994-10-12 | |||
| US1965559A | 1934-07-03 | |||
| JPS6048886B2 | 1985-10-30 |
Other References:
TADAO NOZAWA, TOHOKU UNIVERSITY DISSERTATION: DOCTORAL DISSERTATION, 1979
See also references of EP 3812478A4
See also references of EP 3812478A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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