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Title:
MANUFACTURING METHOD OF ORIENTED MAGNETIC STEEL SHEET EXCELLENT IN IRON LOSS CHARACTERISTICS
Document Type and Number:
Japanese Patent JP2015199974
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of an oriented magnetic steel sheet, achieving low iron loss in a stable state.SOLUTION: In the manufacturing method of an oriented magnetic steel sheet, a steel raw material containing 2.0 to 8.0 mass% of Si is subjected to hot rolling, cold rolling, and annealing for primary recrystallization and subsequent finish annealing. In rapid heating at a rate of 50°C/s or more in the region of 200 to 700°C in the heating process for primary recrystallization annealing, at least one retention treatment is performed at any temperature in the range of 250 to 500°C so as to have a total treatment time of 0.5 to 7 seconds, and at least one retention treatment is performed at any temperature in the range of 500 to 700°C so as to have a total treatment time of 0.5 to 3 seconds. When a magnetic domain subdivision treatment is performed in any process after cold rolling, the intervals W (mm) between linear grooves or linear strain regions in the rolling direction and the total retention treatment time t(s) in the temperature range of 250 to 500°C are controlled to satisfy the following expression: -t+20.

Inventors:
WAKISAKA YUIKO
IMAMURA TAKESHI
KAMISAKA MASANORI
Application Number:
JP2014077856A
Publication Date:
November 12, 2015
Filing Date:
April 04, 2014
Export Citation:
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Assignee:
JFE STEEL CORP
International Classes:
C21D8/12; B23K15/00; C22C38/00; C22C38/60; H01F1/16
Domestic Patent References:
JP2014047411A2014-03-17
JP2013047383A2013-03-07
JP2003096520A2003-04-03
JP2014025106A2014-02-06
JPS63105926A1988-05-11
Attorney, Agent or Firm:
Patent business corporation Ginza horse chestnut patent firm