CSP生产中钢板表面纵裂分析及解决措施  

Analyse and Measures of Surface Longitudinal Cracks of Steel Sheet in CSP Production

作　　者：李慧琴[1] 张跃华[1] 付月英[2] 王权[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]包头钢铁(集团)公司,内蒙古包头014010

出　　处：《连铸》2010年第2期39-43,共5页Continuous Casting

摘　　要：针对CSP生产过程中SS400钢板产生的表面纵向裂纹进行研究与分析。结果表明：钢板表面纵向裂纹大部分分布在钢板宽度方向的两个1/4区域内,裂纹的长度一般为0.5-2.0 m,深度为0.1-0.2 mm,宽度均小于1 mm。其裂纹沟内均含有由Na、Mg、Al、Si、Cl、K、Ca等元素组成的复合夹杂物相,而在裂纹的内部有氧化铁夹杂物。进一步分析认为,该种表面缺陷产生于连铸结晶器内,在随后二冷区的强冷和加热炉的加热过程中,裂纹得到了进一步的扩展。通过对结晶器传热的控制和二冷水的调整,板坯的纵裂得到了控制。Surface longitudinal crack were studied and analized for SS400 steel sheet, which occurred during CSP manufacturing. The results demonstrated that most of the longitudinal cracks were distributed in two 1/4 areas along wide direction of the steel sheet and appeared as parallel beam or reticulate form. The length and the depth of the cracks were 0.5--2.0mm and 0.1--0. 2mm, respectively, and the width was less than lmm. Complex inclusions which composed of Na, Mg, Al, Si, CI, K, Ca, etc were found along the trench of the cracks, while only ferric oxide was found inside the cracks. Further analysis showed that such surface cracks originally formed in continuous casting mould and further enlarged by quick cooling in secondary cooling area and heating process in furnace. The longitudinal cracks of steel sheet were controlled by controlling heat transfer in the mould and adjusting secondary water cooling,

关 键 词：CSP 表面纵向裂纹 分析 措施 

分 类 号：TF777.1[冶金工程—钢铁冶金]