IP Library › Granted Patent US 12,381,024
Granted Patent B2
US 12,381,024 · App. 17/755,318 · Granted Aug 5, 2025

Non-oriented electrical steel sheet and method for manufacturing the same

Inventors: Yoshihiko Oda (Tokyo, JP); Yoshiaki Zaizen (Tokyo, JP); Tomoyuki Okubo (Tokyo, JP); Takaaki Tanaka (Tokyo, JP); Yukino Miyamoto (Tokyo, JP)
Assignee: JFE STEEL CORPORATION
H01F1/16C21C7/06C22C38/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26
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Quick Facts
Patent No.
US 12,381,024
App. No.
17/755,318
Granted
Aug 5, 2025
Kind
B2
Abstract

Provides is a non-oriented electrical steel sheet suitable for use in a rotor of an IPM motor that has excellent magnetic flux density B 50 and high-frequency iron loss properties, high tensile strength and fatigue strength, and little variation in tensile strength. The non-oriented electrical steel sheet has a predetermined steel sheet chemical composition and a microstructure in which a ratio of non-recrystallized microstructure is 5% or more and 70% or less and the number of inclusion having a diameter of 5 μm or more is not more than 5 counts/mm 2 .

Claims (30)

1. A non-oriented electrical steel sheet comprising:

a steel sheet chemical composition containing, in mass %,

C: 0% or more and 0.0100% or less,

P: 0% or more and 0.100% or less,

Si: 2.00% or more and 5.00% or less,

Mn: 0% or more and 5.00% or less,

Al: 0.1% or more and 3.00% or less,

S: 0% or more and 0.0100% or less,

N: 0% or more and 0.0050% or less,

Zn: 0.0005% or more and 0.0030% or less,

Mo: 0.001% or more and 0.100% or less,

Cu: 0% or more and 0.2% or less,

Nb: 0% or more and 0.010% or less, and

O: 0% or more and 0.0050% or less, with the balance being Fe and inevitable impurities; and

a microstructure in which a ratio of non-recrystallized microstructure is 5% or more and 70% or less, and the number of inclusion having a diameter of 5 μm or more is not more than 5 counts/mm 2 .

2. The non-oriented electrical steel sheet according to claim 1 , further comprising Cr: 0.010 mass % or more and 5.000 mass % or less as the steel sheet chemical composition.

3. The non-oriented electrical steel sheet according to claim 2 , further comprising Ca: 0.0010 mass % or more and 0.0050 mass % or less as the steel sheet chemical composition.

4. The non-oriented electrical steel sheet according to claim 3 , further comprising Sn: 0.001 mass % or more and 0.100 mass % or less and/or Sb: 0.0010 mass % or more and 0.1000 mass % or less as the steel sheet chemical composition.

5. The non-oriented electrical steel sheet according to claim 2 , further comprising Sn: 0.001 mass % or more and 0.100 mass % or less and/or Sb: 0.0010 mass % or more and 0.1000 mass % or less as the steel sheet chemical composition.

6. The non-oriented electrical steel sheet according to claim 1 , further comprising Ca: 0.0010 mass % or more and 0.0050 mass % or less as the steel sheet chemical composition.

7. The non-oriented electrical steel sheet according to claim 6 , further comprising Sn: 0.001 mass % or more and 0.100 mass % or less and/or Sb: 0.0010 mass % or more and 0.1000 mass % or less as the steel sheet chemical composition.

8. The non-oriented electrical steel sheet according to claim 1 , further comprising Sn: 0.001 mass % or more and 0.100 mass % or less and/or Sb: 0.0010 mass % or more and 0.1000 mass % or less as the steel sheet chemical composition.

9. A method for manufacturing the non-oriented electrical steel sheet according to claim 1 , comprising feeding a deoxidizer during vacuum degassing and then perform stirring for 10 minutes or more.

10. A method for manufacturing the non-oriented electrical steel sheet according to claim 2 , comprising feeding a deoxidizer during vacuum degassing and then perform stirring for 10 minutes or more.

11. A method for manufacturing the non-oriented electrical steel sheet according to claim 3 , comprising feeding a deoxidizer during vacuum degassing and then perform stirring for 10 minutes or more.

12. A method for manufacturing the non-oriented electrical steel sheet according to claim 4 , comprising feeding a deoxidizer during vacuum degassing and then perform stirring for 10 minutes or more.

13. A method for manufacturing the non-oriented electrical steel sheet according to claim 5 , comprising feeding a deoxidizer during vacuum degassing and then perform stirring for 10 minutes or more.

14. A method for manufacturing the non-oriented electrical steel sheet according to claim 6 , comprising feeding a deoxidizer during vacuum degassing and then perform stirring for 10 minutes or more.

15. A method for manufacturing the non-oriented electrical steel sheet according to claim 7 , comprising feeding a deoxidizer during vacuum degassing and then perform stirring for 10 minutes or more.

16. A method for manufacturing the non-oriented electrical steel sheet according to claim 8 , comprising feeding a deoxidizer during vacuum degassing and then perform stirring for 10 minutes or more.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 27, 2022
From: ODA, YOSHIHIKO; ZAIZEN, YOSHIAKI; OKUBO, TOMOYUKI; TANAKA, TAKAAKI; MIYAMOTO, YUKINO
To: JFE STEEL CORPORATION
Reel/Frame 059750/0760 →
Priority Claims (1)
JP 2019-196428 · Oct 29, 2019 · national
Continuity (1)
Related Publication 20220375667A1 · Nov 24, 2022
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