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Based on the fact of long period deep desulfurization treatment in LF,the relationships among top slag constituent in LF,molten steel constituent,stirring ability of blowing argon,molten steel temperature and desulphurization rate were analyzed.Through the experiments,the parameters about treatment technology of top slag in LF,the [Als] content in molten steel,slag charge match,molten steel temperature and the argon flow for stirring have been optimized.The desulphurization treatment period in LF can be shortened by 5～8 minutes.The target sulfur content in molten steel can be controlled below 30 ppm within one LF treatment period which is only 36 minutes.The LF treatment period of ultra-low sulfur steel can primarily match with the continuous casting period,multi-heat continuous casting can be ensured.
Based on the fact of long period deep desulfurization treatment in LF, the relationships among top slag constituent in LF, molten steel constitue, stirring ability of blowing argon, molten steel temperature and desulphurization rate were well-expressed. Through the experiments, the parameters about treatment technology of top slag in LF, the [Als] content in molten steel, slag charge match, molten steel temperature and the argon flow for stirring have been optimized. The desulfurization treatment period in LF can be shortened by 5 ~ 8 minutes. The target sulfur content in molten steel can be controlled below 30 ppm within one LF treatment period which is only only 36 minutes. LF treatment period of ultra-low sulfur steel can with match with the continuous casting period, multi-heat continuous casting can be ensured.