Title:
NON-ORIENTED ELECTRICAL STEEL SHEET AND MOTOR CORE COMPRISING SAME
Document Type and Number:
WIPO Patent Application WO/2023/121294
Kind Code:
A1
Abstract:
A non-oriented electrical steel sheet according to one embodiment of the present invention comprises a steel sheet base material and an insulation film positioned on the steel sheet base material, satisfies the following formula 2 before stress relief annealing, and satisfies the following formula 3 after stress relief annealing, the steel sheet base material comprising, by wt%, 2.0-6.5% of Si, 0.1-1.3% of Al, 0.3-2.0% of Mn, 0.03% or less of Sn (excluding 0%), 0.02% or less of Sb (excluding 0%) and the balance of Fe and other inevitable impurities and satisfying the following formula 1. [Formula 1] 0.030 ≥ [Sn] + [Sb] ≥ 0.005 [Formula 2] 0.1 ≥ [Mn film] / [Mn50] [Formula 3] 10 ≥ [Mn film] / [Mn50] ≥ 1 (In formula 1 to formula 3, [Sn] and [Sb] represent the amounts of Sn and Sb, respectively, [Mn film] represents the average amount (wt%) of Mn in the insulation film, and [Mn50] represents the amount (wt%) of Mn at a depth of 50 μm from the interface between the steel sheet base material and the insulation film toward the inside of the steel sheet base material.)
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Inventors:
KWON SOOBIN (KR)
KIM YUNSU (KR)
KIM YUNSU (KR)
Application Number:
PCT/KR2022/020963
Publication Date:
June 29, 2023
Filing Date:
December 21, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/02; C21D8/12; C22C38/04; C22C38/06; H01F1/147
Domestic Patent References:
| WO2021117325A1 | 2021-06-17 |
Foreign References:
| JP2021038458A | 2021-03-11 | |||
| KR20190003783A | 2019-01-09 | |||
| JPH0920966A | 1997-01-21 | |||
| JP2006161094A | 2006-06-22 |
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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