倒角连铸坯角部纵向裂纹形成机制及控制  

Formation mechanism and control method of longitudinal corner crack on slab with chamfering mold

作　　者：赵晶[1] 甄新刚[1] 朱志远[1] 王玉龙[1] 张虎成[1] 赵新宇[2] 

机构地区：[1]秦皇岛首秦金属材料有限公司炼钢部,河北秦皇岛066000 [2]首钢技术研究院宽厚板所,北京100043

出　　处：《钢铁》2015年第7期43-47,共5页Iron and Steel

摘　　要：倒角结晶器是控制板坯角部横向裂纹的有效方法之一,但角部纵向裂纹是倒角连铸坯易发的缺陷,这成为了倒角结晶器大规模应用的最大障碍。通过研究倒角结晶器生产工艺参数、设备精度以及喷嘴堵塞等因素对倒角连铸坯角部纵向裂纹的影响,确定了角部纵向裂纹发生的机制。研究表明,倒角结晶器窄面锥度不合理、0段和1段连接偏差以及喷嘴堵塞等是角部纵向裂纹产生的主要原因。通过采取有效措施,可以将倒角连铸坯角部纵向裂纹发生率降低到0.6%以下,使得倒角结晶器实现大规模的工业应用。Chamfering mold is one of the effective methods for controlling the transverse corner cracking of slab. However the longitudinal corner cracking will occur in slab with chamfering mold,which is the most critical hinder for wide usage of chamfering mold. The effects on longitudinal corner cracking of chamfered slab of process parameters and equipment accuracy as well as spray nozzle blocking are analyzed. The formation mechanism of longitudinal corner cracking has been found. Research shows that,the main causes of longitudinal corner cracking are the inconsequence taper of narrow face,the deviation of 0 and 1 section connection and spray nozzle clogging. Through effective measures,chamfering mold can be extensively applied to industry manufacture as the percentage of occurrence for longitudinal corner cracking of CC slab is reduced below 0.6%.

关 键 词：倒角结晶器 角部纵向裂纹 窄面锥度 喷嘴堵塞 

分 类 号：TF777[冶金工程—钢铁冶金]