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对江苏沙钢集团有限公司RH处理W470无取向硅钢脱氧工艺进行了优化研究。试验结果表明,RH终点钢水w(T.O)由(20~30)×10-6降至(15~20)×10-6,硅和锰氧化量减少,含SiO2、MnO类大尺寸复合夹杂的数量大幅度减少;铸坯中大尺寸复合夹杂数量进一步减少,电镜观察20μm以上夹杂物数量及最大夹杂物尺寸均大幅度降低;但由于顶渣T.Fe含量偏高,对钢水存在一定的二次氧化,铸坯中小尺寸Al2O3类夹杂数量依然较多。此外,工艺优化后,合金中硅和锰元素的收得率均有所提高。
The optimal treatment of W470 non-oriented silicon steel deoxidation by RH treatment was carried out by Jiangsu Shagang Group Co., Ltd. The experimental results showed that the w (TO) of the molten steel at the end of RH decreased from (20 ~ 30) × 10-6 to (15 ~ 20) × 10-6, the oxidation of silicon and manganese decreased, and the inclusion of large- The number of large-size composite inclusions in the slab decreased further. The number of inclusions above 20μm and the size of the largest inclusions in the cast slab decreased greatly. However, due to the high content of T.Fe in the top slag, Secondary oxidation, the small size of the slab inclusions is still more Al2O3. In addition, after the process is optimized, the yield of silicon and manganese in the alloy is increased.