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Grain oriented electrical steel sheet and method for manufacturing the same
US9330839B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9330839-B2 |
| Application number | US-201113814357-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 3, 2011 |
| Priority date | Aug 6, 2010 |
| Publication date | May 3, 2016 |
| Grant date | May 3, 2016 |
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Abstract
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A grain oriented electrical steel sheet is subjected to magnetic domain refining treatment by electron beam irradiation and exhibits excellent low-noise properties when assembled as an actual transformer, in which a ratio (Wa/Wb) of a film thickness (Wa) of the forsierite film on a strain-introduced side of the steel sheet to a film thickness (Wb) of the forsierite film on a non-strain-introduced side of the steel sheet is 0.5 or higher, a magnetic domain discontinuous portion in a surface of the steel sheet on the strain-introduced side has an average width of 150 to 300 μm, and a magnetic domain discontinuous portion in a surface of the steel sheet on the non-strain-introduced side has an average width of 250 to 500 μm.
First claim
Opening claim text (preview).
The invention claimed is: 1. A grain oriented electrical steel sheet comprising a forsterite film formed on a surface thereof, being subjected to strain introduction by an electron beam and having a magnetic flux density B 8 of 1.92 T or higher, wherein a ratio (Wa/Wb) of a film thickness of the forsterite film on a strain-introduced side of the steel sheet (Wa) to a film thickness of the forsterite film on a non-strain-introduced side of the steel sheet (Wb) is 0.5 or higher, and wherein a magnetic domain discontinuous portion in a surface of the steel sheet on the strain-introduced side has an average width in a direction at right angles to a longitudinal direction of the magnetic domain discontinuous portion of 150 to 300 μm, and a magnetic domain discontinuous portion in a surface of the steel sheet on the non-strain-introduced side has an average width in a direction at right angles to a longitudinal direction of the magnetic domain discontinuous portion of 250 to 500 μm. 2. The grain oriented electrical steel sheet according to claim 1 , wherein Wa/Wb is 0.5 to 0.9.
Assignees
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Classifications
during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title
Recycling · CPC title
containing silicon · CPC title
containing Ni (C21D6/004 takes precedence) · CPC title
Final recrystallisation annealing · CPC title
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- What does patent US9330839B2 cover?
- A grain oriented electrical steel sheet is subjected to magnetic domain refining treatment by electron beam irradiation and exhibits excellent low-noise properties when assembled as an actual transformer, in which a ratio (Wa/Wb) of a film thickness (Wa) of the forsierite film on a strain-introduced side of the steel sheet to a film thickness (Wb) of the forsierite film on a non-strain-introduc…
- Who is the assignee on this patent?
- Omura Takeshi, Yamaguchi Hiroi, Okabe Seiji, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification C22C38/34. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 03 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).