High-strength non-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-9362032-B2
Application number	US-201214111245-A
Country	US
Kind code	B2
Filing date	Apr 11, 2012
Priority date	Apr 13, 2011
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A high-strength non-oriented electrical steel sheet contains: in mass %, C: 0.010% or less; Si: not less than 2.0% nor more than 4.0%; Mn: not less than 0.05% nor more than 0.50%; Al: not less than 0.2% nor more than 3.0%; N: 0.005% or less; S: not less than 0.005% nor more than 0.030%; and Cu: not less than 0.5% nor more than 3.0%, a balance being composed of Fe and inevitable impurities. An expression (1) is established where a Mn content is represented as [Mn] and a S content is represented as [S], and not less than 1.0×10 4 pieces nor more than 1.0×10 6 pieces of sulfide having a circle-equivalent diameter of not less than 0.1 μm nor more than 1.0 μm are contained per 1 mm 2

10≦[Mn]/[S]≦50  (1).

First claim

The invention claimed is:

1. A high-strength non-oriented electrical steel sheet, containing:
in mass %,
C: 0.010% or less;
Si: not less than 2.0% nor more than 4.0%;
Mn: not less than 0.05% nor more than 0.50%;
Al: not less than 0.2% nor more than 3.0%;
N: 0.005% or less;
S: not less than 0.005% nor more than 0.030%; and
Cu: not less than 1.2% nor more than 3.0%,
a balance being composed of Fe and inevitable impurities,
an expression (1) being established where a Mn content is represented as [Mn] and a S content is represented as [S],
not less than 2.5×10 5 pieces nor more than 1.0×10 6 pieces of sulfide having a circle-equivalent diameter of not less than 0.1 μm nor more than 1.0 μm being contained per 1 mm 2 , and
hot rolling having been performed at a finishing temperature of 1000° C. or higher and a coiling temperature of 650° C. or lower,
10≦[Mn]/[S]≦50  (1).

2. The high-strength non-oriented electrical steel sheet according to claim 1 , further containing, in mass %, Ni: not less than 0.5% nor more than 3.0%.

3. The high-strength non-oriented electrical steel sheet according to claim 1 , further containing, in mass %, 0.5% or less in total of at least one element selected from the group consisting of Ti, Nb, V, Zr, B, Bi, Mo, W, Sn, Sb, Mg, Ca, Ce, Co, Cr, and REM.

4. The high-strength non-oriented electrical steel sheet according to claim 2 , further containing, in mass %, 0.5% or less in total of at least one element selected from the group consisting of Ti, Nb, V, Zr, B, Bi, Mo, W, Sn, Sb, Mg, Ca, Ce, Co, Cr, and REM.

Assignees

• Arita Yoshihiro
• Fujikura Masahiro
• Murakami Hidekuni
• Nippon Steel & Sumitomo Metal Corp

Inventors

• Arita Yoshihiro
• Fujikura Masahiro
• Murakami Hidekuni

Classifications

• C22C38/00 Primary

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• C21D8/1222

  Hot rolling · CPC title

• C22C38/04

  containing manganese · CPC title

• C22C38/02

  containing silicon · CPC title

• C21D8/1261

  following hot rolling · CPC title