Title:
方向性電磁鋼板の製造方法
Document Type and Number:
Japanese Patent JP4943560
Kind Code:
B2
Abstract:
Hot rolling is performed on a steel with a predetermined composition containing Ti: 0.0020 mass% to 0.010 mass% and/or Cu: 0.010 mass% to 0.50 mass% to obtain a hot-rolled steel sheet. Annealing is performed on the hot-rolled steel sheet to obtain an annealed steel sheet. Cold rolling is performed on the annealed steel sheet to obtain a cold-rolled steel sheet. Decarburization annealing and nitridation annealing are performed on the cold-rolled steel sheet to obtain a decarburized nitrided steel sheet. Then, finish annealing is performed on the decarburized nitrided steel sheet. When obtaining the decarburized nitrided steel sheet, heating on the cold-rolled steel sheet is started in a decarburizing and nitriding atmosphere, then first annealing is performed at a first temperature within a predetermined range, and then second annealing is performed at a second temperature within a predetermined range.
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Inventors:
Kenichi Murakami
Yoshiyuki Ushigami
Yoshiyuki Ushigami
Application Number:
JP2011524095A
Publication Date:
May 30, 2012
Filing Date:
February 18, 2011
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C21D8/12; B21B3/02; C22C38/00; C22C38/16; C22C38/60; C23C8/26; H01F1/16; C21D9/46
Domestic Patent References:
| JP2007238984A | 2007-09-20 | |||
| JPH02200733A | 1990-08-09 | |||
| JPH02294428A | 1990-12-05 |
Foreign References:
| WO2009091127A2 | 2009-07-23 |
Attorney, Agent or Firm:
Takayoshi Kokubun