Title:
PROCESSING METHOD OF GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
Japanese Patent JP2019163519
Kind Code:
A
Abstract:
To provide a grain-oriented electromagnetic steel sheet having less variations in terms of magnetic characteristics.SOLUTION: The processing method of a grain-oriented electromagnetic steel sheet includes: preparation of a hot-rolled steel sheet by heating a slab containing a predetermined composition and the balance of Fe and impurities to 1280°C or more and hot rolling; preparation of a cold-rolled steel sheet by performing cold rolling twice or more being interposed with one-time cold rolling or intermediate annealing after subjecting the hot-rolled steel sheet to hot-rolled sheet annealing; subjecting the cold-rolled steel sheet to primary recrystallization annealing which includes rapid heating at a rate of 400°C/s or more and a cooling process; applying an annealing separation agent containing MgO to a surface of the cold-rolled steel sheet after the primary recrystallization annealing; applying an insulating film to the steel sheet after the finish annealing, followed by performing planarization annealing.SELECTED DRAWING: Figure 1
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Inventors:
MORISHIGE NORISATO
KATAOKA TAKASHI
ATSUMI HARUHIKO
TAKECHI TOSHIYA
TANABE AKIRA
TADA HIROTOSHI
SUENAGA TOMOYA
KATAOKA TAKASHI
ATSUMI HARUHIKO
TAKECHI TOSHIYA
TANABE AKIRA
TADA HIROTOSHI
SUENAGA TOMOYA
Application Number:
JP2018052901A
Publication Date:
September 26, 2019
Filing Date:
March 20, 2018
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
C21D8/12; C22C38/00; C22C38/60; H01F1/147
Domestic Patent References:
| JP2014524978A | 2014-09-25 | |||
| JP2016536460A | 2016-11-24 | |||
| JP2017222898A | 2017-12-21 | |||
| JP2011174138A | 2011-09-08 | |||
| JP2015183189A | 2015-10-22 |
Foreign References:
| US20130306202A1 | 2013-11-21 |
Attorney, Agent or Firm:
Tetsuo Kanamoto
Koji Hagiwara
Koji Hagiwara