Title:
NON-ORIENTED ELECTROMAGNETIC STEEL SHEET, MOTOR CORE, AND METHODS RESPECTIVELY FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2021/117325
Kind Code:
A1
Abstract:
In the manufacturing of a non-oriented electromagnetic steel sheet by subjecting a steel slab containing 2.8 to 6.5 mass% of Si and 0.0005 to 0.0050 mass% of Zn to hot-rolling, then cold-rolling and then final annealing, a coating agent which contains at least one element selected from Sn, Sb, P, S, Se, As, Te, B, Pb and Bi is applied onto a surface of a steel sheet obtained after the finish annealing to form an insulating coating film having a nitridation-suppressing ability or, alternatively, an intermediate layer which contains at least one element selected from Sn, Sb, P, S, Se, As, Te, B, Pb and Bi and has a nitridation-suppressing ability is formed on a surface of a steel sheet base material that has bee subjected to the final annealing and then an insulating coating film that does not contain the above-mentioned element is formed on the intermediate layer. In this manner, a non-oriented electromagnetic steel sheet which makes it possible to manufacture both of a rotor core having high strength and a stator core having excellent magnetic properties after stress-relief annealing from a single type of material can be manufactured, and a motor core comprising a rotor core and a stator core both can be manufactured from the steel sheet.
Inventors:
ZAIZEN YOSHIAKI (JP)
NAKAGAWA NOBUKO (JP)
ODA YOSHIHIKO (JP)
OKUBO TOMOYUKI (JP)
TADA CHIYOKO (JP)
NAKAGAWA NOBUKO (JP)
ODA YOSHIHIKO (JP)
OKUBO TOMOYUKI (JP)
TADA CHIYOKO (JP)
Application Number:
PCT/JP2020/038448
Publication Date:
June 17, 2021
Filing Date:
October 12, 2020
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/12; C22C38/14; C22C38/60; C23C22/00; H01F1/147; H01F3/02; H01F41/02; H02K1/02
Domestic Patent References:
| WO2019017426A1 | 2019-01-24 |
Foreign References:
| EP3556882A1 | 2019-10-23 | |||
| EP3561102A1 | 2019-10-30 | |||
| JP2014208885A | 2014-11-06 | |||
| JP2001223105A | 2001-08-17 | |||
| JP2018021241A | 2018-02-08 | |||
| JP2018021242A | 2018-02-08 | |||
| JP2008050686A | 2008-03-06 |
Other References:
See also references of EP 4036257A4
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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