The effects of soaking and normalizing temperatures on the secondary recrystallization and magnetic properties in high permeability 3w/o silicon-iron alloys containg boron, sulfur, nitrogen and various amounts of MnS have been investigated. Soaking temperatures ranged from 1150℃ to 1350℃ and normalizing temperatures from 850℃ to 1100℃.
In case of boron-silicon iron alloys with low manganese content (0.004w/o Mn), complete secondary recrystallization has occurred in all samples soaked, normalized in the temperature ranged, and the best magnetic property, $B_{10}$ =1,9T, was observed in the sample normalized at 900℃. For the boron-silicon iron alloys with high manganese content (0.12w/o Mn, 0.19w/o Mn), however, soaking temperature of 1150℃ lead to normal grain growth. The samples with soaking temperatures of 1250℃ and 1350℃ revealed secondary recrystallized grains when normalized above 900℃, and the best magnetic property, $B_{10}$=1.8T, was observed in the sample normalized at 1000℃.
The Temperature above which the secondary recrystallization occurs increased with increasing soaking temperature.
