降低高磁感取向硅钢铁损的研究

REDUCING CORE LOSS OF HIGH INDUCTION ORIENTED SILICON STEEL

本文研究了改善高磁感取向硅钢磁性的方法,证明采取加入铜和锡、改进常化工艺和冷轧时效处理三种措施后,在本实验规定的成分范围内,样品磁性相当于日本Z7H牌号的水平,合格率至少为90％。加锡能使常化后析出的A1N质点更细小,数量增多,初次晶粒尺寸细化,使冷轧时效处理效果更显著,减小成品二次晶粒尺寸,铁损W_(17/50)降低0.2W/kg以上。改进的常化工艺使A1N质点细小,数量增多,W_(17/50)降低约0.1 W/kg。冷轧时效处理改善了冷轧后和脱碳退火后织构的分布,使二次再结晶完善,二次晶粒尺寸减小,W_(17/50)降低约0.1 W/kg。

In this paper, the process adopted to improve the core loss of high induction oriented silicon steel has been studied. It is found that within the composition range determined by the experiment more than 90 pct of samples reaches the level of Z7H of Nippon Iron and Steel Corporation after adding Cu and Sn and improving normalization process and cold-rolling with inter-pass aging. Sn can refine AIN particles, increase the amount of AIN precipitates after normalization, suppress the growth of the primary grain, strengthen the effect of inter-pass aging and reduce the secondary grain size; thereby the W17/50 is reduced more than 0.2 W/kg. The improved normalization process reduces the W17/50 by about 0.1 W/kg by refining AlN particles and increasing the amount of AlN particles. The cold-rolling with inter-pass aging can improve the distribution of texture after cold-rolling and decarburizing annealing, promote the development of secondary recrystallization and reduce the secondary grain size, thus the W17/60 is lowered by about 0.1 W/kg.