Effect of Two Pairs of Electromagnetic Stirrer in Secondary Cooling Zone on Slab Equiaxed Crystal Ratio and Hot-rolled Plate Microstructure of Non-oriented Silicon Steel

Based on electromagnetic force calculation and industrial test,slab equiaxed crystal ratio and hot-rolled plate microstructure of 50W800 non-oriented silicon steel under different stirring parameters and combination modes of two pairs of electromagnetic stirrer in secondary cooling zone were studied.The results show that when the two pairs of stirring parameters are consistent and being 380A/6Hz,the equiaxed crystal ratio of slab is the highest and 23.48%.When the two pairs of stirring parameters are inconsistent,the equiaxed crystal ratio of slab is the highest and 25.42% with the first stirring parameters being 380A/6Hz and the second stirring parameters being 350A/3Hz.With the increase of slab equiaxed crystal ratio,the surface recrystallized grain size of hot-rolled plate increases gradually,the banded structure in the 1/4 thickness and center of hot-rolled plates decreases significantly,the number and size of recrystallized grains in the 1/4 thickness of hot-rolled plates increase.In combined consideration of increasing equiaxed crystal ratio and grain size of hot-rolled plates,decreasing banded structure of hotrolled plates and lowing power consumption,the first stirring parameters of being 380A/6Hz and the second stirring parameters being 350A/3Hz is the optimal combination mode of stirring parameters.