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探讨了江苏沙钢集团有限公司180 t RH真空脱碳的基本规律,分析了钢液初始条件、真空室内压力、提升气体流量和吹氧时机等工艺参数对脱碳过程的影响。结果表明,沙钢180 t RH脱碳过程分为3个阶段,阶段1和阶段3的脱碳速率常数非常小,阶段2的脱碳速率常数最大,是脱碳的关键阶段。降低钢水初始w(C)/w(O)和w(C)·w(O),有利于缩短阶段1、提高阶段2的脱碳速率常数。提高抽气速率,阶段2的脱碳速率常数增加;随着达到最高真空度的时间缩短,终点碳含量呈降低趋势。脱碳的中后期吹氧或者在处理7 min后将提升气体流量由113 m3/h提高到150 m3/h,对脱碳过程无明显的影响。
The basic rules of vacuum decarburization at 180 t RH of Jiangsu Shagang Group Co., Ltd. are discussed. The influence of process parameters such as initial conditions of liquid steel, pressure in vacuum chamber, gas flow rate and timing of oxygen blowing on decarburization process is analyzed. The results show that the decarburization process at 180 t RH in Shagang is divided into three stages. The decarburization rate constants in Stage 1 and Stage 3 are very small, and the decarburization rate constant in Stage 2 is the largest, which is the key stage for decarburization. Reducing the initial w (C) / w (O) and w (C) · w (O) of the molten steel can shorten the stage 1 and increase the decarburization rate constant of stage 2. Increasing the pumping rate increased the decarburization rate constant in stage 2; as the time to reach the highest vacuum was shortened, the end-point carbon content decreased. During the middle or late stage of decarburization or after 7 min of treatment, the lifting gas flow rate is increased from 113 m3 / h to 150 m3 / h, which has no obvious influence on the decarburization process.