Title:
METHOD FOR PRODUCING GRAIN-ORIENTED MAGNETIC STEEL PLATE
Document Type and Number:
WIPO Patent Application WO/2007/116893
Kind Code:
A1
Abstract:
A method for producing a grain-oriented magnetic steel plate in which magnetostriction of the grain-oriented magnetic steel plate can be reduced as much as possible while iron loss is reduced as much as possible. In the method for producing a grain-oriented electromagnetic steel plate where magnetic characteristics are improved by applying a laser beam condensed finely, distortion due to laser irradiation is optimized in both the plate width direction and the rolling direction by using a power modulation laser having a maximum power density controlled to 1X102-1X104 W/mm2 and, in particular, a magnetic steel plate where magnetstriction is reduced is produced by setting the modulation duty in the range of 70% to less than 100%.
Inventors:
SAKAI TATSUHIKO (JP)
HAMAMURA HIDEYUKI (JP)
HAMAMURA HIDEYUKI (JP)
Application Number:
PCT/JP2007/057498
Publication Date:
October 18, 2007
Filing Date:
March 28, 2007
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
SAKAI TATSUHIKO (JP)
HAMAMURA HIDEYUKI (JP)
SAKAI TATSUHIKO (JP)
HAMAMURA HIDEYUKI (JP)
International Classes:
C21D8/12; B23K26/40; H01F1/16; H01F41/02
Domestic Patent References:
| WO2004083465A1 | 2004-09-30 | |||
| WO2004083465A1 | 2004-09-30 |
Foreign References:
| JP2003129135A | 2003-05-08 | |||
| JPH0657333A | 1994-03-01 |
Other References:
See also references of EP 2006397A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg. 5-1,Toranomon 3-chome, Minato-k, Tokyo 23, JP)
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