Grain-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-12305252-B2
Application number	US-201816629531-A
Country	US
Kind code	B2
Filing date	Jul 13, 2018
Priority date	Jul 13, 2017
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

An grain-oriented electrical steel sheet according to the present invention includes: a base steel sheet; an oxide layer that is formed on the base steel sheet and is formed of amorphous SiO 2 ; and a tension-insulation coating that is formed on the oxide layer. The base steel sheet includes, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80% to 7.00%, Mn: 1.00% or less, acid-soluble Al: 0.065% or less, Seq represented by S+0.406·Se: 0.050% or less, and a remainder consisting of Fe and unavoidable impurities. FWHM that is a half width of a peak of cristobalite type aluminum phosphate obtained by X-ray diffraction satisfies (i) when X-ray diffraction is performed using a Co-Kα excitation source, a half width (FWHM-Co) of a peak appearing at 2θ=24.8° is 2.5 degree or less, or (ii) when X-ray diffraction is performed using a Cu-Kα excitation source, a half width (FWHM-Cu) of a peak appearing at 2θ=21.3° is 2.1 degree or less.

First claim

The invention claimed is:

1. A grain-oriented electrical steel sheet comprising:
a base steel sheet;
an oxide layer that is formed on the base steel sheet and is formed of amorphous SiO 2 ; and
a tension-insulation coating that is formed on the oxide layer,
wherein the base steel sheet includes, as a chemical composition, by mass %,
C: 0.014% or less,
Si: 0.80% to 7.00%,
Mn: 1.00% or less,
acid-soluble Al: 0.065% or less,
Seq represented by S+0.406·Se: 0.050% or less,
N: 0.006% to 0.012%, and
a remainder comprising Fe and impurities,
FWHM that is a half width of a peak of cristobalite type aluminum phosphate obtained by X-ray diffraction is
(i) when X-ray diffraction is performed using a Co-Kα excitation source, FWHM-Co that is a half width of a peak appearing at 2θ=24.8° is 2.5 degree or less, or
(ii) when X-ray diffraction is performed using a Cu-Kα excitation source, FWHM-Cu that is a half width of a peak appearing at 2θ=21.3° is 2.1 degree or less.

2. The grain-oriented electrical steel sheet according to claim 1 ,
wherein a forsterite film is not formed.

3. The grain-oriented electrical steel sheet according to claim 1 ,
wherein the base steel sheet further includes, as a chemical composition, by mass %, at least one of
P: 0.50% or less,
Ni: 0.02% or more and 1.00% or less,
Sn: 0.30% or less,
Sb: 0.30% or less, and
Cu: 0.01% to 0.80%.

4. The grain-oriented electrical steel sheet according to claim 2 ,
wherein the base steel sheet further includes, as a chemical composition, by mass %, at least one of
P: 0.50% or less,
Ni: 0.02% or more and 1.00% or less,
Sn: 0.30% or less,
Sb: 0.30% or less, and
Cu: 0.01% to 0.80%.

Assignees

• Nippon Steel Corp

Inventors

• TAKATANI Shinsuke
• Takahashi Masaru
• Mizukami Kazumi
• Okumura Shunsuke
• Nagano Shohji

Classifications

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• H01F1/147

  Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} · CPC title

• C23C8/26

  of ferrous surfaces · CPC title

• C22C2202/02

  Magnetic · CPC title

• C22C38/60 Primary

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