马钢低碳钢板坯高拉速连铸技术的应用

为了进一步解决连铸高拉速条件下的板坯质量问题,马钢有针对性地开展了低碳钢板坯高拉速连铸技术研发工作。通过采用高效连铸防粘结技术、高效强冷结晶器控制技术、低黏度保护渣优化控制技术、水口堵塞控制技术、动态二冷凝固控制技术等技术措施,解决了高拉速条件下出现的坯壳凝固不均匀、结晶器卷渣、铸坯质量等技术难题;稳定提升1 200 mm宽断面(厚度230 mm)低碳钢铸坯拉速至1.8 m/min;拉速由1.6提至1.8 m/min之后,炉均可减少浇铸时间2.5 min,连铸平均连浇炉数达到6炉以上。技术改进后,有效缩短了浇铸周期,提高了生产效率。

Application of high-speed continuous casting technology for low carbon steel slab in Masteel

In order to solve the slab quality problem under the condition of high casting speed in further, Masteel has carried out the research and development of high-speed continuous casting technology for low carbon steel slab. Through the use of high-efficiency continuous casting anti-sticking technology, high-efficiency and strong cooling mold control technology, low viscosity mold powder optimization control technology, nozzle clogging control technology, dynamic secondary cooling solidification control technology and other technical measures, the technical problems such as uneven solidification of billet shell, slag curling in mold and billet quality under the condition of high drawing speed are solved. The casting speed can be steadily increased to 1.8 m/min, and the casting time can be reduced by 2.5 min after the casting speed of low carbon steel with section 1 200 mm(thickness is 230 mm) is increased from 1.6 to 1.8 m/min. In addition, the average number of continuous casting heats can reach more than 6 heats. After the technical improvement, the casting cycle is effectively shortened and the production efficiency is improved.