非稳态浇铸无取向电工钢板坯对成品铁损的影响

Effect of Unsteady Casting of Non-oriented Electric Steel Slab on the Iron Loss of Final Steel Sheets

采用电解提取夹杂物和扫描电镜-能谱法,分析了无取向电工钢非稳态(开、终浇板坯)和稳态浇铸(中间板坯)对应成品试样的夹杂物数量、种类、尺寸,及其对成品钢卷铁损的影响。结果表明,两者夹杂物均以AlN、MnS、Cu2 S类夹杂为主,开、终浇板坯中还含有少量的氧化物夹杂。0.5μm以下的微细夹杂,数量约为1 500万个/mm3;0.5～5.0μm尺寸范围内的夹杂,非稳态和稳态浇注的板坯中分别为123万个/mm3和75万个/mm3,这也是造成非稳态和与稳态浇注条件下对应成品铁损差异的主要原因。

The amount,composition and size of inclusions in finished specimens of steady and unsteady casted non-oriented electric steel slabs are analyzed by electrolysis extraction of inclusions and SEM-EDS and the effect of inclusions on iron loss of coil is discussed.The results show that the main inclusions are AlN,MnS and Cu2S in both of these slabs with a small amount of inclusions in the first and final slabs.The amount of inclusions under 0.5 μm is about 15,000,000 per cubic millimeter and the amounts of inclusions with size range between 0.5 μm and 5.0 μm are 1,230,000 per cubic milimeter and 750,000 per cubic milimeter in unsteady and steady casted non-oriented electric steel slabs respectively.This is the main reason for the different iron loss between these corresponding finished products under steady and unsteady casting processes with the same casting heat.