Non-oriented electrical steel sheet and method of producing same

Patent metadata

Field	Value
Publication number	US-11286537-B2
Application number	US-201816476937-A
Country	US
Kind code	B2
Filing date	Jan 12, 2018
Priority date	Jan 17, 2017
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

According to the disclosure, it is possible to increase the magnetic flux density and reduce iron loss by setting a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and at least one of Sb: 0.0010% or more and 0.10% or less, and Sn: 0.0010% or more and 0.10% or less, with the balance being Fe and inevitable impurities, an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 μm or more and 200 μm or less, and a Vickers hardness of 140 HV or more and 230 HV or less.

First claim

The invention claimed is:

1. A non-oriented electrical steel sheet comprising a chemical composition consisting of, by mass %,
C: 0.0050% or less,
Si: 2.01% or more and 4.00% or less,
Al: 0.002% or less,
Mn: 0.10% or more and 5.00% or less,
S: 0.0200% or less,
P: 0.200% or less,
N: 0.0050% or less,
O: 0.0200% or less, and
at least one of Sb: 0.0010% or more and 0.10% or less or Sn: 0.0010% or more and 0.10 or less, and
optionally at least one selected from the group consisting of
Ca: 0.0010% or more and 0.0050% or less,
Ni: 0.010% or more and 3.0% or less,
Ti: 0.0030% or less,
Nb: 0.0030% or less,
V: 0.0030% or less, and
Zr: 0.0020% or less,
with the balance being Fe and inevitable impurities, wherein
the non-oriented electrical steel sheet has an Ar 3 transformation temperature of 700° C. or higher and 940° C. or lower, a grain size of 80 μm or more and 200 μm or less, and a Vickers hardness of 140 HV or more and 230 HV or less.

2. The non-oriented electrical steel sheet according to claim 1 , wherein Ca, by mass %: 0.0010% or more and 0.0050% or less.

3. The non-oriented electrical steel sheet according to claim 1 , wherein Ni, by mass %: 0.010% or more and 3.0% or less.

4. The non-oriented electrical steel sheet according to claim 1 , wherein at least one selected from the group consisting of, by mass %
Ti: 0.0030% or less,
Nb: 0.0030% or less,
V: 0.0030% or less, and
Zr: 0.0020% or less.

5. A method of producing the non-oriented electrical steel sheet as recited in claim 1 , the method comprising performing hot rolling in at least one pass in a dual phase region from γ-phase to α-phase, thereby producing the non-oriented electrical steel sheet of claim 1 .

6. The non-oriented electrical steel sheet according to claim 2 , wherein Ni, by mass %: 0.010% or more and 3.0% or less.

7. The non-oriented electrical steel sheet according to claim 2 , wherein at least one selected from the group consisting of, by mass %
Ti: 0.0030% or less,
Nb: 0.0030% or less,
V: 0.0030% or less, and
Zr: 0.0020% or less.

8. The non-oriented electrical steel sheet according to claim 3 , wherein at least one selected from the group consisting of, by mass %
Ti: 0.0030% or less,
Nb: 0.0030% or less,
V: 0.0030% or less, and
Zr: 0.0020% or less.

9. The non-oriented electrical steel sheet according to claim 6 , wherein at least one selected from the group consisting of, by mass %
Ti: 0.0030% or less,
Nb: 0.0030% or less,
V: 0.0030% or less, and
Zr: 0.0020% or less.

10. A method of producing the non-oriented electrical steel sheet as recited in claim 2 , the method comprising performing hot rolling in at least one pass in a dual phase region from γ-phase to α-phase, thereby producing the non-oriented electrical steel sheet of claim 2 .

11. A method of producing the non-oriented electrical steel sheet as recited in claim 3 , the method comprising performing hot rolling in at least one pass in a dual phase region from γ-phase to α-phase, thereby producing the non-oriented electrical steel sheet of claim 3 .

12. A method of producing the non-oriented electrical steel sheet as recited in claim 4 , the method comprising performing hot rolling in at least one pass in a dual phase region from γ-phase to α-phase, thereby producing the non-oriented electrical steel sheet of claim 4 .

13. A method of producing the non-oriented electrical steel sheet as recited in claim 6 , the method comprising performing hot rolling in at least one pass in a dual phase region from γ-phase to α-phase, thereby producing the non-oriented electrical steel sheet of claim 6 .

14. A method of producing the non-oriented electrical steel sheet as recited in claim 7 , the method comprising performing hot rolling in at least one pass in a dual phase region from γ-phase to α-phase, thereby producing the non-oriented electrical steel sheet of claim 7 .

15. A method of producing the non-oriented electrical steel sheet as recited in claim 8 , the method comprising performing hot rolling in at least one pass in a dual phase region from γ-phase to α-phase, thereby producing the non-oriented electrical steel sheet of claim 8 .

16. A method of producing the non-oriented electrical steel sheet as recited in claim 9 , the method comprising performing hot rolling in at least one pass in a dual phase region from γ-phase to α-phase, thereby producing the non-oriented electrical steel sheet of claim 9 .

Assignees

• Jfe Steel Corp

Inventors

• Oda Yoshihiko
• Okubo Tomoyuki
• Zaizen Yoshiaki
• Uesaka Masanori

Classifications

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• C22C38/14

  containing titanium or zirconium · CPC title

• C22C38/02

  containing silicon · CPC title

• C22C38/06

  containing aluminium · CPC title

• C21D6/005

  containing Mn · CPC title