Annealing separator composition for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet, and method for manufacturing grain-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-12325890-B2
Application number	US-201917414777-A
Country	US
Kind code	B2
Filing date	Dec 18, 2019
Priority date	Dec 19, 2018
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

An oriented electrical steel sheet according to an embodiment of the present invention includes: a base texture; an AI permeation layer positioned on the base texture; and a film positioned on the AI permeation layer, wherein the AI permeation layer includes AI at 0.5 to 5 wt %, and the film includes an Al—Mg composite.

First claim

The invention claimed is:

1. An oriented electrical steel sheet comprising:
a base texture;
an AI permeation layer positioned on the base texture; and
a film positioned on the AI permeation layer,
wherein the AI permeation layer includes AI at 0.5 to 5 wt %, and
the film includes an Al—Mg composite, and
the film consists of 0.1 to 10 wt % of Al, 5 to 30 wt % of Mg, 0.1 to 20 wt % of Si, 10 to 55 wt % of O, and the balance of Fe.

2. The oriented electrical steel sheet of claim 1 , wherein
the film has a thickness of 0.1 to 10 μm.

3. The oriented electrical steel sheet of claim 1 , wherein
the AI permeation layer includes α-oxide aluminum.

4. The oriented electrical steel sheet of claim 3 , wherein
an occupied area of the α-oxide aluminum relative to the AI permeation layer area is 0.1 to 50% with respect to the cross-section in the thickness direction of the steel sheet.

5. The oriented electrical steel sheet of claim 1 , wherein
the AI permeation layer has a thickness of 0.1 to 10 μm.

6. The oriented electrical steel sheet of claim 1 , wherein
the base texture includes silicon (Si) at 2.0 to 7.0 wt %, aluminum (Al) at 0.020 to 0.040 wt %, manganese (Mn) at 0.01 to 0.20 wt %, phosphorus (P) at 0.01 to 0.15 wt %, carbon (C) at 0.01 wt % or less (excluding 0%), N at 0.005 to 0.05 wt %, and 0.01 to 0.15 wt % of antimony (Sb), tin (Sn), or a combination thereof, and the balance includes Fe and other inevitable impurities.

Assignees

• Posco
• Posco Co Ltd

Inventors

• Han Min Soo
• Kim Yunsu
• Park Jong-Tae

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C21D8/1283 Primary

  Application of a separating or insulating coating · CPC title

• C21D8/1233

  Cold rolling · CPC title

• C21D8/1222

  Hot rolling · CPC title

• C22C38/06 Primary

  containing aluminium · CPC title