Grain-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-12555709-B2
Application number	US-202218285440-A
Country	US
Kind code	B2
Filing date	May 27, 2022
Priority date	May 28, 2021
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

Provided is a grain oriented electrical steel sheet including a base metal steel sheet, an intermediate layer and an insulation coating, wherein: the intermediate layer is an oxide film; an average thickness of the oxide film is 2-500 nm; the insulation coating is a phosphate coating; an average thickness of the insulation coating is 0.1-10 μm. When grazing incidence X-ray diffraction is performed on the phosphate coating using a Co-Kα excitation source, the X-ray diffraction pattern has a diffraction peak originating from cristobalite-type aluminum phosphate at a diffraction angle of 2θ=24.8°; a half value width FWHM 0.5 of the diffraction peak under a diffraction condition with an X-ray incident angle ω=0.5° and a half value width FWHM 1.0 of the diffraction peak under a diffraction condition with an X-ray incident angle ω=1.0° satisfy 0.20°≤FWHM 0.5 ≤2.00°, 0.20°≤FWHM 1.0 ≤2.00°, and 0°≤|FWHM 0.5 −FWHM 1.0 |≤1.00°.

First claim

The invention claimed is:

1 . A grain-oriented electrical steel sheet comprising:
a base metal steel sheet, an intermediate layer disposed on and in contact with the base metal steel sheet, and an insulation coating disposed on and in contact with the intermediate layer, wherein the intermediate layer is an oxide film satisfying the followings: Si content: 20 to 70 atomic %, O content: 30 to 80 atomic %, Mg content: 20 atomic % or less, P content: 5 atomic % or less, and Fe content: less than 20 atomic %; and the average thickness of the oxide film is 2 to 500 nm; and wherein the insulation coating is a phosphate coating satisfying the followings: P content: 5 to 30 atomic %, Si content: 5 to 30 atomic %, O content: 30 to 80 atomic %, Al content: 0.1 to 10 atomic %, Cr content: less than 1 atomic %, Fe content: less than 25 atomic %, Mg content: 0 to 10 atomic %, Mn content: 0 to 10 atomic %, Ni content: 0 to 10 atomic %, Zn content: 0 to 10 atomic %, V content: 0 to 10 atomic %, W content: 0 to 10 atomic %, Zr content: 0 to 10 atomic %, Co content: 0 to 10 atomic %, and Mo content: 0 to 10 atomic %, and the average thickness of the phosphate coating is between 0.1 μm and 10 μm, and wherein when grazing incidence X-ray diffraction is performed on the phosphate coating using a Co-Kα excitation source, the X-ray diffraction pattern has a diffraction peak originating from cristobalite-type aluminum phosphate at a diffraction angle of 2θ=24.8°, wherein a peak intensity of a diffraction peak appearing at a diffraction angle 2θ=34.3° is 0.50 times or less than a peak intensity of the diffraction peak appearing at the diffraction angle 2θ=24.8° under diffraction conditions where an X-ray incident angle ω=0.5°, and when a half value width of a diffraction peak under a diffraction condition where the X-ray incident angle ω=0.5° is represented as FWHM 0.5 and a half value width of a diffraction peak under the diffraction condition where the X-ray incident angle ω=1.0° is represented as FWHM 1.0 , FWHM 0.5 and FWHM 1.0 satisfy the followings: 0.20°≤FWHM 0.5 ≤2.00°, 0.20°≤FWHM 1.0 ≤2.00°, and 0°≤|FWHM 0.5 −FWHM 1.0 |≤1.00°.

Assignees

• Nippon Steel Corp

Inventors

• TAKATANI Shinsuke
• Takeda Kazutoshi
• Takahashi Masaru
• Ushigami Yoshiyuki

Classifications

• C23C28/04

  only coatings of inorganic non-metallic material · CPC title

• C23C22/82

  After-treatment · CPC title

• C22C38/60

  containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur · CPC title

• C22C38/34

  with more than 1.5% by weight of silicon · CPC title

• C22C38/32

  with boron · CPC title