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目前,对连续退火冷轧钢板良好的冲压成型特性的要求日益增长,为了满足这一要求,采用常规炼钢工艺生产超低碳钢十分重要。1977年以来,川崎钢公司千叶厂第三炼钢车间为采用Q-BOP-RH法生产超低碳钢而建立一种主要生产方法作了不懈的努力。其结果是,目前已能稳定生产连浇30炉次以上、平均〔C〕含量为20ppm的超低碳钢。下面将介绍采用Q-BOP-RH法生产超低碳钢的工艺。一、超低碳钢的生产方法第三炼钢车间用于生产超低碳钢的方法及其对各工艺阶段钢中碳含量的影响分别示于表1和图1。将Q-BOP的钢水(平均〔C〕含量为100～200ppm)运往RH站,然后在RH站进行钢水真空脱碳,将碳含量降至目标值20ppm。脱碳、脱氧的时间平均为25分钟。
At present, the demand for good stamping properties of continuously annealed cold-rolled steel plates is increasing. To meet this requirement, it is very important to produce ultra-low carbon steel by conventional steelmaking process. Since 1977, the third steelmaking plant of Kawasaki Steel Company Chiba Plant has made unremitting efforts to establish a major production method for the production of ultra-low carbon steel by the Q-BOP-RH method. As a result, it is now possible to stably produce ultra-low carbon steels with an average [C] content of 20 ppm in succession over 30 heats. The following describes the use of Q-BOP-RH production of ultra-low carbon steel process. First, the production method of ultra-low carbon steel The third steelmaking plant for the production of ultra-low carbon steel and its impact on the carbon content of each process stage steel are shown in Table 1 and Figure 1. The Q-BOP molten steel (average [C] content of 100-200 ppm) was transported to the RH station and then subjected to vacuum decarburization at the RH station to reduce the carbon content to the target value of 20 ppm. Decarburization and deoxygenation time averaging 25 minutes.