Non-oriented electrical steel sheet and method of producing same

Patent metadata

Field	Value
Publication number	US-11649532-B2
Application number	US-201917055601-A
Country	US
Kind code	B2
Filing date	May 20, 2019
Priority date	May 21, 2018
Publication date	May 16, 2023
Grant date	May 16, 2023

Abstract

Provided is a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising a chemical composition containing C: 0.0050% or less, Si: 2.0% or more and 6.0% or less, Mn: 1.0% or more and 3.0% or less, P: 0.20% or less, S: 0.0050% or less, N: 0.0050% or less, Al: 0.0050% or less, and one or more selected from B: 0.0001% or more and 0.0050% or less, Nb: 0.0001% or more and 0.0050% or less, and V: 0.0005% or more and 0.0500% or less, with a balance consisting of Fe and inevitable impurities, wherein a number density of Si—Mn nitrides with an average diameter of 50 nm or more and 500 nm or less is 1 or less per μm 3 .

First claim

The invention claimed is:

1. A non-oriented electrical steel sheet, comprising
a chemical composition containing, in mass %,
C: 0.0050% or less,
Si: 2.0% or more and 6.0% or less,
Mn: 1.0% or more and 3.0% or less,
P: 0.012% or less,
S: 0.0050% or less,
N: more than 0% and 0.0050% or less,
Al: 0.0050% or less, and
one or more selected from the group consisting of Nb: 0.0001% or more and 0.0050% or less, and V: 0.0005% or more and 0.0500% or less,
with a balance of Fe and inevitable impurities,
wherein a number density of Si—Mn nitrides with an average diameter of 50 nm or more and 500 nm or less is 0.19 or more and 1 or less per μm 3 .

2. The non-oriented electrical steel sheet according to claim 1 , wherein the chemical composition further contains, in mass %, one or two selected from the group consisting of Sn: 0.01% or more and 0.50% or less and Sb: 0.01% or more and 0.50% or less.

3. The non-oriented electrical steel sheet according to claim 1 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of Ca: 0.0001% or more and 0.0300% or less, Mg: 0.0001% or more and 0.0300% or less, and REM: 0.0001% or more and 0.0300% or less.

4. The non-oriented electrical steel sheet according to claim 1 , wherein the chemical composition further contains, in mass %, one or two selected from the group consisting of Ni: 0.01% or more and 5.00% or less and Co: 0.01% or more and 5.00% or less.

5. The non-oriented electrical steel sheet according to claim 2 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of Ca: 0.0001% or more and 0.0300% or less, Mg: 0.0001% or more and 0.0300% or less, and REM: 0.0001% or more and 0.0300% or less.

6. The non-oriented electrical steel sheet according to claim 2 , wherein the chemical composition further contains, in mass %, one or two selected from the group consisting of Ni: 0.01% or more and 5.00% or less and Co: 0.01% or more and 5.00% or less.

7. The non-oriented electrical steel sheet according to claim 3 , wherein the chemical composition further contains, in mass %, one or two selected from the group consisting of Ni: 0.01% or more and 5.00% or less and Co: 0.01% or more and 5.00% or less.

Assignees

• Jfe Steel Corp

Inventors

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

Classifications

• C21D8/1272 Primary

  Final recrystallisation annealing · CPC title

• C21D8/1261

  following hot rolling · CPC title

• C21D8/1222 Primary

  Hot rolling · CPC title

• H01F1/14775

  in the form of sheets · CPC title

• H01F1/16

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