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Tertiary recrystallization and iron loss of ultra thin silicon steels

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4 Author(s)
K. I. Arai ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan ; H. Satoh ; S. Agatsuma ; K. Ishiyama

Tertiary recrystallized grain-oriented silicon steel sheets with thicknesses from 80 μm to 20 μm were developed. Such ultrathin sheets were produced with appropriate cold rolling and annealing. The magnetic induction B8 of the sheet was above 1.95 T and the coercive force Hc was below 7 A/m. The AC iron loss of the sheet depended on the sheet thickness and was minimized for a 30-μm-thick sheet having W13/50=0.33 W/kg. This value is about 3/5 of that of the best-grade conventional silicon steel sheet. The loss was reduced further by W13/50=0.17 W/kg when a tensile stress of 4 kg/mm 2 was applied to the sheet. This loss is comparable to that of a Fe-Si-B amorphous sheet. Moreover, 5 μm thick grain-oriented sheets can be obtained by applying cold rolling to the tertiary recrystallized sheets with a thickness of 20 μm and then annealing them

Published in:

IEEE Transactions on Magnetics  (Volume:26 ,  Issue: 5 )