钙处理对无取向硅钢中非金属夹杂物的影响

Effect of Calcium Treatment on Non-Metallic Inclusions in Non-Oriented Silicon Steel

采用电解法和扫描电镜研究了300 t转炉-RH精炼钙处理对无取向硅钢板(%:≤0.005C、1.2～2.2Si、0.2～0.6Mn、≤0.20P、≤0.005S、0.2～0.6Al、0～0.01Ca)中夹杂物的影响。结果表明,钢中Al含量为0.25%和0.35%时,钢中溶解氧均小于1×10^(-4)%,钙处理后都会产生CaS夹杂物,尤其是含0.35%Al的钢水;钙处理可以有效减少钢中的夹杂物数量,尤其是0.5μm以下的微细夹杂物数量;钙处理后夹杂物的种类以AlN、CaS为主,同时还含有少量的氧化物夹杂物以及AlN-CaS复合夹杂物,尺寸主要为1.5～5.0μm。

The effect of 300 t converter-RH refining calcium treatment on inclusions in non-oriented silicon steel sheet （%：≤0.005C,1.2～2.2Si,0.2～0.6Mn,≤0.20P,≤0.005S,0.2～0.6A1,0～0.01Ca） has been studied by electrolysis and scanning electron microscope.Results show that with 0.25%and 0.35%Al content in steel,all the dissolved oxygen in liquid is less than 1×10^（-4）%,and the CaS inclusions are produced after calcium treatment,especial for the liquid containing 0.35%Al;the amount of inclusions in steel is sharply decreased by calcium treatment process especially for less than 0.5μm tiny inclusions;the main inclusions after calcium treatment are AlN and CaS with minor oxide inclusions and AlN-CaS compound inclusions,and the size of most inclusions is 1.5～5.0μm.