Method of manufacturing grain-oriented electrical steel sheet
US-2022090240-A1 · Mar 24, 2022 · US
Grain-oriented electrical steel sheet
US12060630B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12060630-B2 |
| Application number | US-202017422471-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 16, 2020 |
| Priority date | Jan 16, 2019 |
| Publication date | Aug 13, 2024 |
| Grant date | Aug 13, 2024 |
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Abstract
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This grain-oriented electrical steel sheet does not have a forsterite film present between a base steel sheet and a tension-insulation coating, in which the base steel sheet contains a predetermined element in a predetermined amount, and in a case in which a cross section perpendicular to a rolling direction of the base steel sheet is viewed, when a region having a length of 10 μm from a surface of the base steel sheet toward the inside of the base steel sheet in a sheet thickness direction of the base steel sheet and a length of 20 mm in a direction perpendicular to the sheet thickness direction is an observation region, needle-like inclusions having a length of 1 μm or more are not present in the observation region.
First claim
Opening claim text (preview).
The invention claimed is: 1. A grain-oriented electrical steel sheet in which a forsterite film is not present between a base steel sheet and a tension-insulation coating, wherein the base steel sheet contains: 0.085% by mass or less of C; 0.80 to 7.00% by mass of Si; 0.05 to 1.00% by mass of Mn: 0.065% by mass or less of acid-soluble Al; 0.003% by mass or less of S; 0.0040% by mass or less of N; 0.0005 to 0.0080% by mass of B; 0 to 0.50% by mass of P; 0 to 1.00% by mass of Ni; 0 to 0.30% by mass of Sn; 0 to 0.30% by mass of Sb; 0 to 0.40% by mass of Cu; 0 to 0.30% by mass of Cr; 0 to 0.01% by mass of Bi; and a remainder of Fe and impurities as a chemical composition thereof, and in a case in which a cross section perpendicular to a rolling direction of the base steel sheet is viewed, when a region having a length of 10 μm from a surface of the base steel sheet toward the inside of the base steel sheet in a sheet thickness direction of the base steel sheet and a length of 20 mm in a direction perpendicular to the sheet thickness direction is an observation region, needle-like inclusions having a length of 1 μm or more are not present in the observation region. 2. The grain-oriented electrical steel sheet according to claim 1 , wherein the needle-like inclusion contains mullite represented by 3Al 2 O 3 ·2SiO 2 .
Assignees
Inventors
Classifications
during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title
containing aluminium · CPC title
containing manganese · CPC title
containing silicon · CPC title
containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title
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- What does patent US12060630B2 cover?
- This grain-oriented electrical steel sheet does not have a forsterite film present between a base steel sheet and a tension-insulation coating, in which the base steel sheet contains a predetermined element in a predetermined amount, and in a case in which a cross section perpendicular to a rolling direction of the base steel sheet is viewed, when a region having a length of 10 μm from a surfac…
- Who is the assignee on this patent?
- Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21D8/1283. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 13 2024 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 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).