Non-oriented electrical steel sheet and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-12590358-B2
Application number	US-201917280482-A
Country	US
Kind code	B2
Filing date	Sep 25, 2019
Priority date	Sep 27, 2018
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

A non-oriented electrical steel sheet according to an embodiment of the present invention includes: Si at 1.5 to 4.0 wt %, Al at 0.001 to 0.011 wt %, Mn at 0.05 to 0.40 wt %, S at 0.0001 to 0.01 wt %, As at 0.003 to 0.015 wt %, Mg at 0.0007 to 0.003 wt %, and the balance including Fe and other impurities unavoidably added thereto.

First claim

The invention claimed is:

1 . A non-oriented electrical steel sheet, comprising: Si at 1.5 to 4.0 wt %, Al at 0.001 to 0.011 wt %, Mn at 0.05 to 0.40 wt %, S at 0.0001 to 0.01 wt %, As at 0.0034 to 0.01 wt %, Mg at 0.0009 to 0.002 wt %, and the balance including Fe and other impurities unavoidably added thereto,
wherein the non-oriented electrical steel sheet satisfies Formulas 1 and 2:
[As]>[Al], and  Formula 1

3×[Mg]>[Al],  Formula 2

wherein [As], [Mg] and [Al] are contents (wt %) of As, Mg and Al, respectively, wherein an average particle diameter of the precipitate of As is 3 to 100 nm, wherein an average particle diameter of the precipitate of MgS is 3 to 30 nm, wherein iron loss (W 15/50 ) of the non-oriented electrical steel sheet is 1.5 to 2.15 W/kg, and wherein iron loss (W 13/50 ) of the non-oriented electrical steel sheet is 1.3 to 1.47 W/kg.

2 . The non-oriented electrical steel sheet of claim 1 , further comprising Sn at 0.02 to 0.09 wt % and Pat 0.01 to 0.15 wt %.

3 . The non-oriented electrical steel sheet of claim 2 , wherein the non-oriented electrical steel sheet satisfies Formula 3:
0.03≤[Sn]+[P]≤0.15  [Formula 3]
(in Formula 3, [Sn] and [P] are contents (wt %) of Sn and P, respectively).

4 . The non-oriented electrical steel sheet of claim 1 , further comprising C at 0.004 wt % or less, Nat 0.003 wt % or less, and Ti at 0.003 wt % or less.

5 . The non-oriented electrical steel sheet of claim 1 , wherein
one or more of Cu, Ni, and Cr are further contained in an amount of 0.05 wt % or less, respectively.

6 . The non-oriented electrical steel sheet of claim 1 , wherein
one or more of Zr, Mo, and V are further contained in an amount of 0.01 wt % or less, respectively.

7 . The non-oriented electrical steel sheet of claim 1 , wherein
a precipitate of As is included at a size of 0.0001 to 0.003 area %.

8 . The non-oriented electrical steel sheet of claim 1 , wherein
a precipitate of MgS is included at a size of 0.0002 to 0.005 area %.

9 . The non-oriented electrical steel sheet of claim 1 , wherein
an average grain size is 60 to 300 μm.

Assignees

• Posco
• Posco Co Ltd

Inventors

• Lee Seil

Classifications

• C22C38/06

  containing aluminium · CPC title

• C22C38/04

  containing manganese · CPC title

• C22C38/02 Primary

  containing silicon · CPC title

• C22C38/008

  containing tin · CPC title

• C22C38/002 Primary

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title