Patent ID: 11948711
Assignee: NIPPON STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H  Y | IPC C  H

Claim 0:
1. A grain oriented electrical steel sheet comprising:
a base steel sheet;
a glass film which is arranged on the base steel sheet; and
a tension-insulation coating which is arranged on the glass film,
wherein an average chemical composition of the base steel sheet and the glass film includes by mass %:
0.010% or less of C;
2.5 to 4.0% of Si;
0.01 to 1.00% of Mn;
0.010% or less of N;
0.010% or less of sol Al;
0.005 to 0.030% of insol Al;
0.05 to 0.20% of Mg;
0.05 to 0.40% of O;
0 to 0.020% of Ti;
0.010% or less of S;
0.030% or less of P;
0 to 0.50% of Sn;
0 to 0.50% of Cr;
0 to 0.50% of Cu;
0 to 0.0100% of Bi;
0 to 0.020% of Se;
0 to 0.50% of Sb; and
a balance comprising Fe and impurities, and
wherein, when glow emission spectroscopic spectrums of Al and Si are measured by conducting a glow discharge emission spectroscopy from a surface of the glass film toward a depth direction,
when Ts which is an analysis starting time is regarded as the surface of the glass film,
when TAlp is regarded as a time at which Al shows a maximum emission intensity,
when F(TAlp) is regarded as an Al emission intensity at the TAlp,
when TSip is regarded as a time at which Si shows a maximum emission intensity, and
when F(TSip) is regarded as an Al emission intensity at the TSip,
the Ts, the TAlP, the F(TAlp), the TSip, and the F(TSip) satisfy
0.05≤F(TSip)/F(TAlp)≤0.50 and
2.0≤(TAlp−Ts)/(TSip−Ts)≤5.0.