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Title:
METHOD FOR MANUFACTURING NON-ORIENTED ELECTROMAGNETIC STEEL PLATE, METHOD FOR MANUFACTURING MOTOR CORE, AND MOTOR CORE
Document Type and Number:
WIPO Patent Application WO/2018/179871
Kind Code:
A1
Abstract:
Provided are a method for manufacturing a non-oriented electromagnetic steel plate with which a rotor core having high strength and a stator core having superior magnetic properties after strain-relief annealing can be obtained from the same material, a method for manufacturing a motor core from that steel plate, and that motor core. When a non-oriented electromagnetic steel plate is manufactured by hot rolling, cold rolling, finish annealing, and strain-relief annealing a steel slab containing C, Si, Mn, P, S, Al, N, Ti, Nb, and V in prescribed amounts and containing the Si, Al, and Mn so as to satisfy Si − 2Al − Mn ≥ 0, the conditions for finish annealing and strain-relief annealing are adjusted such that the yield stress after the finish annealing is 400 MPa or greater, the iron loss W10/400 (W/kg) after the strain-relief annealing as related to plate thickness t (mm) satisfies W10/400 ≤ 10 + 25t, and furthermore, the magnetostriction λ0-p (annealing) after the strain-relief annealing is 5.0 × 10-6 or less, with the ratio (λ0-p (annealing)/λ0-p (product)) of the magnetostriction before strain-relief annealing and the magnetostriction after strain-relief annealing being less than 0.8.

Inventors:
ZAIZEN YOSHIAKI (JP)
ODA YOSHIHIKO (JP)
OKUBO TOMOYUKI (JP)
Application Number:
PCT/JP2018/004135
Publication Date:
October 04, 2018
Filing Date:
February 07, 2018
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C22C38/00; C22C38/14; C22C38/60; H01F1/147
Domestic Patent References:
WO2016017263A12016-02-04
Foreign References:
JP2016138316A2016-08-04
JP2016151050A2016-08-22
JP2008050686A2008-03-06
JP2011091936A2011-05-06
US20140366988A12014-12-18
CN103498096A2014-01-08
JP2018021242A2018-02-08
JP2008050686A2008-03-06
Other References:
TADA HIROTOSHI ET AL.: "Influence of Magentic Antisotropy on Hysteresis Loss of non. oriented Electrical Steel Sheet", IRON AND STEEL, vol. 101, no. 4, 31 March 2015 (2015-03-31), pages 269 - 273, XP009515821, DOI: 10.2355/tetsutohagane.101.269
See also references of EP 3572535A4
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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