摘要:
通过电磁搅拌力计算及工业试验,研究了两对二冷电磁搅拌器在不同搅拌参数及组合方式下50W800无取向硅钢的铸坯等轴晶率及热轧板组织。结果表明,两对搅拌辊搅拌参数一致时,搅拌参数均为380A/6Hz的铸坯等轴晶率最高,为23.48%;两对搅拌辊搅拌参数不一致时,第一对搅拌参数为380A/6Hz和第二对搅拌参数为350A/3Hz的铸坯等轴晶率最高,为25.42%。随着铸坯等轴晶率的增加,热轧板表层的再结晶晶粒尺寸逐渐增加,1/4厚度处和心部的纤维组织明显减少,且1/4厚度处再结晶晶粒的数量增加、尺寸增大。综合考虑增加铸坯等轴晶率和热轧板晶粒尺寸、减少热轧板带状组织以及降低电能消耗,第一对搅拌辊的搅拌参数为380A/6Hz和第二对搅拌辊的搅拌参数为350A/3Hz为最优搅拌参数组合方式。
Abstract:
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.
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