倒角结晶器技术在南钢的应用

Application of Chamfered Mould Technology in NISCO

为解决铸坯角部缺陷,提高铸坯的角部质量,避免进行线下修磨和后续轧制工序出现边部缺陷问题。通过对角部裂纹成因的分析,引进倒角结晶器工艺,并对其设备和工艺参数进行调整,大大改善了铸坯在铸机内凝固过程的温度场和应力场作用,降低了铸坯的角部裂纹缺陷,提高了铸坯的整体质量。在易产生角部裂纹的含硼或铌微合金钢、包晶钢等钢种的铸坯的角部裂纹修磨率由52.9%降至9.43%。

In order to solve the problem of corner crack to improve the corner quality of continuous casting slabs,and to avoid the edge defects in off-line grinding and subsequent rolling process,the technology of chamfered mould is introduced based on the analysis of the causes of the corner cracks,and the equipment and process parameters are adjusted accordingly.The temperature field and stress field of the continuous casting slab in the caster during the solidification process is significantly improved and the corner crack is therefore decreased.The overall quality of the slab is also increased.The corner crack repair rate of boron or niobium micro-alloyed and peritectic steel which are easy to produce corner cracks,is decreased from 52.9%to 9.43%.