Grain oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-11948711-B2
Application number	US-202017761092-A
Country	US
Kind code	B2
Filing date	Sep 16, 2020
Priority date	Sep 19, 2019
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A grain oriented electrical steel sheet includes a base steel sheet, a glass film, and a tension-insulation coating. When a glow discharge emission spectroscopy is conducted from a surface of the glass film toward a depth direction, an analysis starting time Ts, a time TAlp at which Al shows a maximum emission intensity, an Al emission intensity F(TAlp) at the TAlp, a time TSip at which Si shows a maximum emission intensity, and an Al emission intensity F(TSip) at the TSip satisfy 0.05≤F(TSip)/F(TAlp)≤0.50 and 2.0≤(TAlp−Ts)/(TSip−Ts)≤5.0.

First claim

What is claimed is:

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 T Al p is regarded as a time at which Al shows a maximum emission intensity,
when F(T Al p ) is regarded as an Al emission intensity at the T Al p ,
when T Si p is regarded as a time at which Si shows a maximum emission intensity, and
when F(T Si p ) is regarded as an Al emission intensity at the T Si p ,
the Ts, the T Al P , the F(T Al p ), the T Si p , and the F(T Si p ) satisfy
0.05≤F(T Si p )/F(T Al p )≤0.50 and
2.0≤(T Al p −Ts)/(T Si p −Ts)≤5.0.

2. The grain oriented electrical steel sheet according to claim 1 ,
wherein a thickness of the base steel sheet is 0.17 mm or more and less than 0.22 mm.

3. The grain oriented electrical steel sheet according to claim 1 ,
wherein the average chemical composition includes, by mass %, at least one selected from:
0.01 to 0.50% of Cr;
0.01 to 0.50% of Sn;
0.01 to 0.50% of Cu;
0.0010 to 0.0100% of Bi;
0.001 to 0.020% of Se; and
0.01 to 0.50% of Sb.

4. The grain oriented electrical steel sheet according to claim 2 ,
wherein the average chemical composition includes, by mass %, at least one selected from:
0.01 to 0.50% of Cr;
0.01 to 0.50% of Sn;
0.01 to 0.50% of Cu;
0.0010 to 0.0100% of Bi;
0.001 to 0.020% of Se; and
0.01 to 0.50% of Sb.

5. The grain oriented electrical steel sheet according to claim 1 ,
wherein, when glow emission spectroscopic spectrums of Al and Fe are measured by conducting a glow discharge emission spectroscopy from a surface of the glass film toward a depth direction,
when T Al p is regarded as a time at which Al shows a maximum emission intensity,
when T Fe 60 is regarded as a time at which an Fe emission intensity becomes 60% as compared with a saturation value of Fe emission intensity, and
when T Fe 90 is regarded as a time at which an Fe emission intensity becomes 90% as compared with the saturation value of Fe emission intensity,
the T Al P , the T Fe 60 , and the T Fe 90 satisfy
T Fe 60 <T Al p ≤T Fe 90 .

6. The grain oriented electrical steel sheet according to claim 2 ,
wherein, when glow emission spectroscopic spectrums of Al and Fe are measured by conducting a glow discharge emission spectroscopy from a surface of the glass film toward a depth direction,
when T Al p is regarded as a time at which Al shows a maximum emission intensity,
when T Fe 60 is regarded as a time at which an Fe emission intensity becomes 60% as compared with a saturation value of Fe emission intensity, and
when T Fe 90 is regarded as a time at which an Fe emission intensity becomes 90% as compared with the saturation value of Fe emission intensity,
the T Al P , the T Fe 60 , and the T Fe 90 satisfy
T Fe 60 ≤T Al p ≤T Fe 90 .

7. The grain oriented electrical steel sheet according to claim 3 ,
wherein, when glow emission spectroscopic spectrums of Al and Fe are measured by conducting a glow discharge emission spectroscopy from a surface of the glass film toward a depth direction,
when T Al p is regarded as a time at which Al shows a maximum emission intensity,
when T Fe 60 is regarded as a time at which an Fe emission intensity becomes 60% as compared with a saturation value of Fe emission intensity, and
when T Fe 90 is regarded as a time at which an Fe emission intensity becomes 90% as compared with the saturation value of Fe emission intensity,
the T Al P , the T Fe 60 , and the T Fe 90 satisfy
T Fe 60 ≤T Al p ≤T Fe 90 .

8. The grain oriented electrical steel sheet according to claim 4 ,
wherein, when glow emission spectroscopic spectrums of Al and Fe are measured by conducting a glow discharge emission spectroscopy from a surface of the glass film toward a depth direction,
when T Al p is regarded as a time at which Al shows a maximum emission intensity,
when T Fe 60 is regarded as a time at which an Fe emission intensity becomes 60% as compared with a saturation value of Fe emission intensity, and
when T Fe 90 is regarded as a time at which an Fe emission intensity becomes 90% as compared with the saturation value of Fe emission intensity,
the T Al P , the T Fe 60 , and the T Fe 90 satisfy
T Fe 60 ≤T Al p ≤ T Fe 90 .

Assignees

• Nippon Steel Corp

Inventors

• Kataoka Takashi
• Tanaka Ichiro
• Atsumi Haruhiko
• Takeda Kazutoshi
• Yamagata Ryutaro
• Morishige Nobusato

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

• H01F1/14783 Primary

  with insulating coating · CPC title

• C21D3/04

  Decarburising · CPC title

• C21D6/002

  containing Cr (C21D6/004 takes precedence) · CPC title

• C21D6/005

  containing Mn · CPC title