Grain-oriented electrical steel sheet
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.
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%.