Abstract: Abstract The magnetic properties of non-oriented electrical steels are closely related to the cleanliness level. In order to achieve reasonable control of oxygen in non-oriented electrical steel smelting process,the change of carbon and oxygen content were analyzed, the critical carbon content at the end-point of BOF and α_FeO  in slag were also calculated. The results show that with the decrease of end-point carbon content, the end-point oxygen content increases and fluctuates widely. The ideal carbon content in tapping should be controlled at 0. 03% ~0. 05%. It is required that the content of T. Fe in slag should be ≤ 24% and the end-point carbon content should be higher than 0.031%. Ladle botton argon blowing can effectively reduce excess oxygen and decrease carbon-oxygen product in molten steel. According to production data, the ideal carbon and oxygen content should be controlled at 0.025% ~0. 035% and 500 X 10^-6 ~650 X 10^-6 before RH refining, and the end-point carbon content of BOF should be controlled at 0.03% ~0.04%.

摘要： 无取向硅钢的磁性能与钢的洁净度水平密切相关。为实现对无取向电工钢冶炼过程氧含量的合理控制,分析了无取向电工钢冶炼过程碳氧含量变化数据,热力学计算转炉终点临界碳含量与炉渣α_FeO。结果表明:随着转炉终点碳含量的降低,终点氧含量升高且波动范围大,合理出钢碳含量应控制为0.03%～0.05%;为满足炉渣中T.Fe≤24%的现场生产要求,终点碳含量应高于0.031%;钢包底吹氩气可有效降低钢液中过剩氧,降低钢液的平均碳氧积;据现场生产数据,RH精炼前理想碳、氧含量应控制为0.025%～0.035%和500×10^-6～650×10^-6,相应转炉终点碳含量控制为0.03%～0.04%。