连铸管坯质量对钢管内折缺陷的影响

C.C.Steel Billet Quality vs Steel Tube Internal Folding Defect

在对连铸管坯晶区进行划分的基础上阐述了连铸管坯穿孔特有的“隔墙”现象,探讨了连铸管坯的低倍组织及主要化学成分等对钢管热轧的常见缺陷——内折的影响和连铸管坯的各区域及柱状晶的大小与内折之间的关系,同时通过回归分析法得出碳当量与内折率的关系式。

Based on the identification of the grain zones of the C.C. steel billet for tube rolling, the unique phenomenon of ＂walling＂ of the billet as being pierced is analyzed. Discussed are the main elements of the C.C. billet responsible for the common defect internal folding of the hot-rolled tube, i.e., the macrostructure and chemical composition, and the relationship between different grain zones and the size of columnar crystal and the said internal folding. Moreover the regression method is used to deduce the formula of the relationship between carbon equivalent and the internal folding rate.