Non-oriented electrical steel sheet and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9187830-B2
Application number	US-201113577946-A
Country	US
Kind code	B2
Filing date	Feb 15, 2011
Priority date	Feb 18, 2010
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

A non-oriented electrical steel sheet includes: a base iron ( 1 ); and a tension applying type insulating film ( 2 ) of not less than 1 g/m 2 nor more than 6 g/m 2 on a surface of the base iron ( 1 ). An oxide layer ( 3 ) containing at least one type of oxide selected from the group consisting of Si, Al, and Cr and having a thickness of not less than 0.01 μm nor more than 0.5 μm is formed on the surface of the base iron ( 1 ).

First claim

The invention claimed is:

1. A non-oriented electrical steel sheet comprising:
a base iron containing:
Si, Al, and Cr: not less than 2 mass % and not more than 6 mass % in total content,
Mn: not less than 0.1 mass % and not more than 1.5 mass %,
C: equal to or less than 0.005 mass %, and
a balance of Fe and inevitable impurities;

an oxide layer containing Al 2 O 3 or (Al, Cr) 2 O 3 ;
wherein the oxide layer has a thickness of not less than 0.01 μm and not more than 0.5 μm; and
wherein the oxide layer is formed on a surface of the base iron; and

a tension-applying type insulating film of not less than 1 g/m 2 and not more than 6 g/m 2 on the surface of the base iron.

2. The non-oriented electrical steel sheet according to claim 1 , wherein the total content of Al and Cr of the base iron is equal to or more than 0.8 mass %.

3. The non-oriented electrical steel sheet according to claim 1 , wherein the insulating film is formed by baking of a coating solution containing phosphate and colloidal silica.

4. The non-oriented electrical steel sheet according to claim 1 , wherein the insulating film is formed by baking of a coating solution containing boric acid and an alumina sol.

5. The non-oriented electrical steel sheet according to claim 2 , wherein the insulating film is formed by baking of a coating solution containing phosphate and colloidal silica.

6. The non-oriented electrical steel sheet according to claim 2 , wherein the insulating film is formed by baking of a coating solution containing boric acid and an alumina sol.

Assignees

• Yamazaki Shuichi
• Kubota Takeshi
• Kurosaki Yousuke
• Fujikura Masahiro
• Shimazu Takahide
• Nippon Steel & Sumitomo Metal Corp

Inventors

• Yamazaki Shuichi
• Kubota Takeshi
• Kurosaki Yousuke
• Fujikura Masahiro
• Shimazu Takahide

Classifications

• C21D8/12 Primary

  during manufacturing of articles with special electromagnetic properties · CPC title

• C22C38/02 Primary

  containing silicon · CPC title

• C23C22/74 Primary

  for obtaining burned-in conversion coatings · CPC title

• C23C24/00 Primary

  Coating starting from inorganic powder (spraying of the coating material in molten state C23C4/00; solid state diffusion C23C8/00 - C23C12/00) · CPC title

• C22C38/04

  containing manganese · CPC title