基于“射钉法”的凝固坯壳厚度测定的应用研究  

Application research on thickness measurement of solidified slab shell by pin-shooting

作　　者：周秀丽[1] 冷祥贵[1] 彭世恒[2] 倪修华[3] 

机构地区：[1]上海梅山钢铁股份有限公司炼钢厂,江苏南京210039 [2]钢铁研究总院连铸技术国家工程研究中心,北京100081 [3]上海梅山钢铁股份有限公司技术中心,江苏南京210039

出　　处：《连铸》2015年第6期25-29,共5页Continuous Casting

摘　　要：在双相钢生产过程中,对钢材内部质量有着严格要求,特别是溶质元素的中心偏析现象对钢材使用性能有严重影响。连铸工序实施凝固末端轻压下可以改善铸坯中心偏析,但实施效果与压下位置紧密相关。以双相钢590DP连铸过程为研究对象,通过射钉试验确定不同工况条件下凝固末端的准确位置,并构建铸坯凝固过程的预测模型。对断面尺寸为230 mm×1 200 mm的铸坯,在拉速1.0 m/min和1.2 m/min条件下的凝固过程进行了模型预测,并有针对性地实施了凝固末端轻压下,试验结果表明:铸坯内部质量得到明显改善,铸坯中心偏析由原先的B1.0提升到C0.5,铸坯中心偏析的曼内斯曼标准符合率由改进前的72%提高到改进后95.3%。The internal quality requirement of steel in dual-phase steel production process is strict. In particular,the central segregation of solute elements seriously impacts the performance of steel. Soft reduction at the solidification end in continuous casting process can significantly improve the central segregation and its effectiveness is closely related with the depressed position. Choosing the continuous casting process of dual-phase steel 590 DP as a study object,the exact location of solidification end under different working conditions has been determined by pin-shooting test,and the prediction model of solidified shell has been constructed using the results of test. For slab of 230 mm×1 200 mm section size,model prediction has been made for the solidification process under casting speed of 1.0 m/min and 1.2 m/min respectively,and soft reduction at the solidification end is implemented pertinently. The results show that the internal quality of slab has been improved significantly. The center segregation of slab upgrades from the original B1.0 to C0.5. The Mannesmann standard coincidence rate of the slab center segregation increases from 72% to 95.3%.

关 键 词：连铸 轻压下 坯壳厚度 射钉试验 

分 类 号：TF777[冶金工程—钢铁冶金]