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Grain oriented electrical steel sheet, method for manufacturing grain oriented electrical steel sheets, method for evaluating grain oriented electrical steel sheets, and iron core
US10697038B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10697038-B2 |
| Application number | US-201515514746-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 11, 2015 |
| Priority date | Sep 26, 2014 |
| Publication date | Jun 30, 2020 |
| Grant date | Jun 30, 2020 |
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- Title
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Abstract
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A grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet, wherein a total area percentage of defective parts scattered on the forsterite film is less than 1.5% relative to a surface area of the forsterite film when viewed from above the surface, and methods for evaluating a grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet.
First claim
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The invention claimed is: 1. A grain oriented electrical steel sheet having a steel sheet and a forsterite film formed on a surface of the steel sheet, wherein: a total area percentage of defective parts scattered on the forsterite film is in the range of 0.1% to less than 1.5% relative to a surface area of the forsterite film when viewed from above the surface, and the defective parts do not include a film defect having a visually recognizable size, the visually recognizable size being defined as a circular, elliptical, or similar amorphous defect having an equivalent circular diameter of greater than 200 μm. 2. The grain oriented electrical steel sheet according to claim 1 , wherein at least part of the defective parts is streaky. 3. The grain oriented electrical steel sheet according to claim 1 , wherein a surface of the grain oriented electrical steel sheet is treated with magnetic domain refining treatment. 4. An iron core comprising layers of the grain oriented electrical steel sheet according to claim 1 . 5. A method for manufacturing the grain oriented electrical steel sheet of claim 1 , having a steel sheet and a forsterite film formed on a surface of the steel sheet, the method comprising: screening the grain oriented electrical steel sheet based on whether the total area percentage of defective parts scattered on the forsterite film when viewed from above the surface is within the range of 0.1% to less than 1.5%. 6. The method for manufacturing a grain oriented electrical steel sheet according to claim 5 , further comprising performing magnetic domain refining treatment on the surface of the grain oriented electrical steel sheet determined to be acceptable in the screening step.
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Classifications
Recycling · CPC title
Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light · CPC title
using incident electron beams, e.g. scanning electron microscopy [SEM] · CPC title
with insulating coating · CPC title
Final recrystallisation annealing · CPC title
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- What does patent US10697038B2 cover?
- A grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet, wherein a total area percentage of defective parts scattered on the forsterite film is less than 1.5% relative to a surface area of the forsterite film when viewed from above the surface, and methods for evaluating a grain or…
- Who is the assignee on this patent?
- Jfe Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21D9/46. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 30 2020 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).