宝钢炼钢异常板坯的分析与控制

Analysis and control of abnormal slab in Baosteel

针对宝钢炼钢过程中的板坯异常问题,进行了现场跟踪与分析,得出炼钢过程中板坯异常主要与过热度和液面波动异常有关。研究发现,炼钢各工序间时间间隔不适宜,易造成工序间温度符合率低下;头尾坯、异钢种交接坯生产中拉速不稳定以及正常板坯浇铸过程中氩气流量过大,均易造成液面波动异常,从而导致板坯异常。通过制定相应火车时刻表、改进炼钢生产计划编排、优化连铸氩气流量等措施,有效控制了浇铸过程中过热度异常与浇铸液面波动问题,使宝钢异常板坯量得到有效的改善。

Aiming at the problem of abnormal slab during the steelmaking process of Baosteel,the field tracking and analysis were carried out,and the results showed that the slab anomalies during the steelmaking process were mainly concerned with the abnormal superheat and liquid level fluctuation. The study found that time interval between each procedure of steelmaking is not appropriate,and it is easy to cause a low temperature coincidence rate between procedures;the instability of casting speed during the production process of the head and tail slab and transition slab of different steel grade and the large argon flow during normal slab continuous casting process,both are easy to cause the liquid level fluctuation,further resulting in abnormal slab. By setting the corresponding train timetable,improving of steelmaking production schedule,and optimizing the argon flow during the continuous casting,the abnormal of superheat and liquid level fluctuation during the continuous casting process were controlled,thus the abnormal slab yield was effectively improved.