Non-oriented electrical steel sheet and method of producing same

Patent metadata

Field	Value
Publication number	US-11056256-B2
Application number	US-201716343847-A
Country	US
Kind code	B2
Filing date	Aug 30, 2017
Priority date	Oct 27, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

Iron loss is reduced by increasing magnetic flux density. Disclosed is a non-oriented electrical steel sheet has 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 Ca: 0.0010% or more and 0.0050% or less, with the balance being Fe and inevitable impurities, in which the non-oriented electrical steel sheet has an Ar 3 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 containing, by mass %,
C: 0.0050% or less,
Si: 1.50% or more and 4.00% or less,
Al: 0.020% 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
Ca: 0.0010% or more and 0.0050% 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 950° 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 the chemical composition further contains, by mass %,
Ni: 0.010% or more and 3.000% or less.

3. The non-oriented electrical steel sheet according to claim 1 , wherein the chemical composition further contains, by mass %,
Ti: 0.0030% or less,
Nb: 0.0030% or less,
V: 0.0030% or less, and
Zr: 0.0020% or less.

4. The non-oriented electrical steel sheet according to claim 2 , wherein the chemical composition further contains, 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 of y-phase and a-phase, thereby producing the non-oriented electrical steel sheet of claim 1 .

6. 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 of y-phase and a-phase, thereby producing the non-oriented electrical steel sheet of claim 2 .

7. 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 of y-phase and a-phase, thereby producing the non-oriented electrical sheet of claim 3 .

8. 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 of y-phase and a-phase, thereby producing the non-oriented electrical steel sheet of claim 4 .

Assignees

• Jfe Steel Corp

Inventors

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

Classifications

• H01F1/14775 Primary

  in the form of sheets · CPC title

• H01F1/16

  in the form of sheets (H01F1/147 takes precedence) · CPC title

• C22C38/08

  containing nickel {(C22C38/105 takes precedence)} · CPC title

• C21D9/46

  for sheet metals · CPC title

• C22C38/002

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