中文摘要：

结合工业化生产的无取向硅钢,进行了RH精炼添加稀土合金实验。结果表明,1.15%（质量分数）Si钢的脱硫反应,主要发生在添加稀土合金之后的前5min。最佳的稀土合金添加量为0.6~0.9kg/t钢。钢液经过稀土处理后,加入的稀土总量越多,稀土氧硫化物夹杂物的尺寸就越大,但热轧带钢再结晶效果会逐渐变差,成品带钢晶粒尺寸先是快速长大,而后逐渐减小。最佳的钢中存留稀土含量与钢的化学成分有关,应严格控制在2.0×10-3%~6.0×10-3%（质量分数）。在此范围内,钢的铁损先是快速降低,而后缓慢升高,钢的磁感应强度则单调降低。

英文摘要：

Based on the industrial proctuctlon of non-oriented during the RH refining process was studied. The results showed that the effects of desulfurization and total con-centration of RE remained in steel mainly depended on the chemical compositions of different steel grades. For 1.15wt% Si steel grade, the desulfurization reaction mainly focused on the initial 5rain after RE alloy added during the RH refining process. The suitable RE alloy addition was 0. 6-0. 9kg/t steel. Meanwhile, the desulfu-rization efficiency was optimal, about 50 % or above. After the suitable RE treatment, the size of RE oxysulfide inclusions get bigger as the increase of RE concentration, and the recrystallization effects of hot rolled strip get bad. The grain size of fiv ished steel sheets increased as the increase of RE concentration quickly, and then de-creased. At the same conditions, the optimal RE concentration remained in steel was related to the chemical composition of different steel grade, and should be strictly controlled in the range of 2.0 × 10^-3% to 6.0 × 10^-3wt%. The core loss of finished steel sheets decreased as the increase of RE concentration quickly, and then increased slowly. The electromagnetic induction of finished steel sheets decreased gradually as the increase of RE concentration.