摘要
针对太钢280mm×2 000mm断面Q345B连铸坯中间裂纹导致的锻造过程裂口缺陷问题,采用低倍检验、模型计算等手段分析了铸坯中间裂纹形成机理,在此基础上提出Q345B裂纹缺陷解决措施,为降低铸坯锻造材裂口缺陷率提供了技术支撑。结果表明,太钢Q345B铸坯中间裂纹的主要影响因素为设备辊缝精度,同时连铸工艺参数也是铸坯裂纹形成和扩展的重要条件。针对上述原因,采用提高辊缝精度、降低过热度、增加二次冷却强度工艺可以提高等轴晶,基本消除了中间裂纹缺陷;开发的凝固末端电磁搅拌工艺可以根本上改善内部质量,彻底解决了中间裂纹问题。
Aiming at the problem of forging crack caused by the intermediate crack of Q345 Bcontinuous casting slab with 280 mm×2 000 mm size in TISCO,the forming mechanism of intermediate crack was analyzed by means of macro inspection and model calculation.On this basis,the solution measures of Q345 Bcrack defect were proposed,which provided technical support for reducing the crack defect rate of forging material.The results show that the main influencing factor for the middle crack of Q345 Bslab is the precision of roll gap,and the continuous casting process parameters are also important conditions for the formation and propagation of slab cracks.In view of the above reasons,the process of improving roll gap accuracy,reducing superheat and increasing secondary cooling intensity can improve the equiaxed grain quality and basically eliminate the intermediate crack defects.The development of F-EMS process can fundamentally improve the internal quality and thoroughly solve the problems of intermediate cracks.
作者
元鹏飞
蒋朝晖
赵海明
YUAN Peng-fei;JIANG Zhao-hui;ZHAO Hai-ming(No.2 Steelmaking Plant,Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China)
出处
《连铸》
2021年第4期38-42,65,共6页
Continuous Casting
