模铸40t钢锭凝固过程温度场研究  

Temperature field research of 40 t ingot's solidification process

作　　者：周同军[1] 刘军占[1] 罗辉[1] 

机构地区：[1]宝钢特钢有限公司,上海200940

出　　处：《宝钢技术》2015年第5期39-43,共5页Baosteel Technology

摘　　要：随着模铸钢锭锭型的不断开发以及连铸产品对模铸小规格锭型的替代与延伸,为满足产品质量提升与成本优化,大规格钢锭逐渐发展成了关键的模铸锭型。但是,在模铸生产中,随着锭型的增大,更易于产生各类质量问题,诸如:成分偏析、表面缺陷、钢锭缩孔等。使用计算机数值模拟软件可以模拟钢液凝固过程的温度场与流场变化情况,并且可预测钢锭缩孔缺陷位置。研究表明,40 t钢锭的凝固过程是从外往内、由下向上顺序凝固,不仅冒口部位易于产生缩孔缺陷,而且锭身中心也存在缩孔倾向。在锭身中心的狭长液态金属区域内,此区域锥角小、上下传热不均,易产生缩松缺陷,通过数值模拟可有效预测并推断缺陷存在的位置及原因。实践证明,40 t锭型钢锭凝固及缩孔模拟与现场实际情况吻合,验证了40 t钢锭锭型设计的有效性与科学性。With the continuous development of ingot species in die-casting and the wide extension of continuous casting product specifications for smaller ingots,as to meet product quality improvement and cost optimization,the large ingots become more and more important in ingot casting. While as the ingots become larger, there may easily cause many metallurgical imperfections,such as segregation,surface defects,shrinkage,etc. Using computer software to simulate the solidification process of molten steel can know the temperature field and flow field,and predict the place of ingot shrinkage. And studies show that the solidification path of 40 tons ingot is not only from outside to inside,but also from the ingot bottom to top,and the shrinkage cavity defects can not only happen on the top,but also may be found in the center of the ingot that is a narrow area filled with liquid steel,as the area angle is small and the heat transfer is not the same as the top and bottom,it may easily cause shrinkage defects. The computer numerical simulation can effectively predict and infer the defect ＇s location and reasons, it has been found that the solidification and shrinkage simulation of 40 t ingot is the same as practice,and it proves that the validity and scientificity of the 40 t ingot＇s design.

关 键 词：模铸钢锭 数值模拟 凝固 温度场 

分 类 号：TF771[冶金工程—钢铁冶金]