Title:
GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2017/006955
Kind Code:
A1
Abstract:
In the present invention, during manufacturing of a grain-oriented electromagnetic steel sheet by hot rolling a slab containing 2.0-8.0% by mass of Si and not including an inhibitor forming component, cold rolling and decarburization-annealing the slab, applying a coating of an annealing separating agent having MgO as the main component thereof and containing a Ti compound, and performing a finish annealing, a grain-oriented electromagnetic steel sheet having excellent coating characteristics as well as excellent iron loss characteristics after stress relief annealing is obtained by using a dry atmosphere having a dew point of 0°C or below as the atmosphere in the heating process of the abovementioned decarburization annealing, and adopting a configuration whereby a Ti amount (Ti(a)) and an N amount (N(a)) included in a ferrite from which a forsterite coating is removed and a Ti amount (Ti(b)) and an N amount (N(b)) included in a steel sheet having a forsterite coating satisfy the relationships N(b) ≤ 0.0050 mass%, N(b)/N(a) ≥ 4, and Ti(b)/Ti(a) ≥ 4.
Inventors:
IMAMURA TAKESHI (JP)
TAKENAKA MASANORI (JP)
TAKENAKA MASANORI (JP)
Application Number:
PCT/JP2016/069976
Publication Date:
January 12, 2017
Filing Date:
July 06, 2016
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/12; C21D9/46; C22C38/14; C22C38/60; H01F1/16
Foreign References:
| JP2003193131A | 2003-07-09 | |||
| JP2000119824A | 2000-04-25 | |||
| JPH05195072A | 1993-08-03 | |||
| JPH06179977A | 1994-06-28 | |||
| JP2007169755A | 2007-07-05 | |||
| JP2008261033A | 2008-10-30 |
Other References:
See also references of EP 3321388A4
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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