Grain-oriented electrical steel sheet and method for producing same

Patent metadata

Field	Value
Publication number	US-12448672-B2
Application number	US-202017787308-A
Country	US
Kind code	B2
Filing date	Dec 9, 2020
Priority date	Dec 20, 2019
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A grain-oriented electrical steel sheet according to an embodiment of the present invention may comprise: by weight %, 2.0-4.0% of Si, 0.04-0.2% of Mn, 0.010% or less (exclusive of 0%) of N, 0.01-0.05% of Sb, 0.005% or less (exclusive of 0%) of C, 0.03-0.08% of Sn, 0.01-0.2% of Cr, and the balance of Fe and inevitable impurities; and precipitates which have an average particle size of 5-50 nm and contain at least one of AlN, (Al, Si)N, (Al, Si, Mn)N, Mns, and CuS.

First claim

The invention claimed is:

1. A grain-oriented electrical steel sheet comprising, by weight: 2.0 to 4.0% of Si, 0.04 to 0.2% of Mn, 0.010% or less (exclusive of 0%) of N, 0.01 to 0.05% of Sb, 0.005% or less (exclusive of 0%) of C, 0.03 to 0.08% of Sn, 0.01 to 0.2% of Cr, and 0.015 to 0.030 wt % of Al, with a balance of Fe and inevitable impurities,
wherein precipitates having an average particle diameter of 5 to 50 nm and including one or more of AlN, (Al, Si)N, (Al, Si, Mn)N, Mns, and CuS are included, and
wherein an area fraction of crystal grains having a crystal grain particle diameter of 1 mm or less is 10% or less.

2. The grain-oriented electrical steel sheet of claim 1 , further comprising:
0.010 wt % or less of S.

3. The grain-oriented electrical steel sheet of claim 1 , further comprising:
0.0005 to 0.045 wt % of P.

4. The grain-oriented electrical steel sheet of claim 1 , further comprising:
one or more of 0.1 wt % or less of Co, 0.1 wt % or less of Ni, and 0.1 wt % or less of Mo.

5. The grain-oriented electrical steel sheet of claim 1 , further comprising:
0.010 wt % or less of S,
0.0005 to 0.045 wt % of P, and
one or more of 0.1 wt % or less of Co, 0.1 wt % or less of Ni, and 0.1 wt % or less of Mo.

Assignees

• Posco

Inventors

• Song Dae-Hyun
• Park Junesoo
• Lee Sang-Woo

Classifications

• C21D8/02

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

• C22C38/60

  containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur · CPC title

• C22C38/18

  containing chromium · CPC title

• C22C38/04

  containing manganese · CPC title

• C22C38/008

  containing tin · CPC title