10B21冷镦钢连铸小方坯表面异常振痕成因分析及控制  

Formation reasons and control measures of abnormal oscillation marks for 10B21 cold-heading steel billets

作　　者：付达超 文光华[1] 刘耀宗[2] 唐萍[1] FU Da-chao;WEN Guang-hua;LIU Yao-zong;TANG Ping(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Tube,Pipe and Bar Business Unit,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]宝钢股份钢管条钢事业部,上海201900

出　　处：《连铸》2020年第3期33-37,共5页Continuous Casting

基　　金：国家自然科学基金资助项目(U1760103)。

摘　　要：针对某钢厂10B21冷镦钢连铸小方坯表面出现的深振痕和弯曲振痕问题,利用金相显微镜对铸坯表面异常振痕特征进行了观察,结合实际生产条件分析了表面异常振痕的形成原因,最后提出了调整结晶器振动参数和结晶器电磁搅拌参数的工艺优化措施并进行了生产试验。结果表明,工艺参数优化后铸坯表面异常振痕问题得到有效解决,振痕平整、规则,深度明显变浅,振痕处奥氏体晶粒尺寸明显变小,铸坯表面裂纹显著减少。In order to solve the problems of deep and bending oscillation marks on the surface of billet during continuous casting of 10B21 cold-heading steel produced by a steel mill in china,the characteristics of abnormal oscillation mark on the surface of billet were firstly observed by metallographic microscope,and then the formation reasons of abnormal oscillation mark were analyzed by combining with the actual production conditions.Finally,the process optimization measures to adjust the oscillation parameters and electromagnetic stirring parameters of the mould were proposed and the production tests were carried out.The production test results indicated that the problem of the abnormal oscillation mark on the surface of billet was solved after the adjustment of process parameters,the oscillation mark on the surface of billet become straight and regular,the depth was obviously shallower,the austenite grain size at the oscillation mark decreased obviously,and the surface crack of billet was significantly reduced.

关 键 词：10B21冷镦钢 小方坯 深振痕 弯曲振痕 振动参数 电磁搅拌参数 

分 类 号：TF777.3[冶金工程—钢铁冶金]