| To improve the cold workability of non-oriented electrical steel containing 3.1wt% of Si, the effects of Si content and slab reheating temperature were investigated. By lowering the slab reheating temperature from 1250℃ to 1150℃, better magnetic properties have been obtained, regardless of the Si content, due to the increased grain size and the decreased unfavorable (111) texture component in the final annealed sheets. The rate of increase in core loss due to the decrease in Si content was 0.76w/㎏/wt%Si for the slab reheating temperature of 1150℃, which was found to be much higher than 0.24w/㎏/wt%Si obtained for the reheating temperature of 1250℃ It is concluded that both the reduction in grain size and specific resistivity account for the increase in the core loss of the specimens reheated to 1150℃, whereas the specific resistivity alone affects the core loss of the specimens reheated to 1250℃. |
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