高Nb、Ti含量钢坯开裂原因分析及控制措施  

Analysis on Formation of Cracks in High Nb and Ti ContentBillet and Control Measures

作　　者：梁文[1,2] 吴润[1] 陈吉清[2] 裴海 张鹏武 刘志勇[2] 韩荣东[2] 

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081 [2]武钢研究院,湖北武汉430080 [3]武钢股份公司二炼钢厂,湖北武汉430083 [4]武钢股份公司二热轧厂,湖北武汉430083

出　　处：《钢铁钒钛》2013年第3期83-87,共5页Iron Steel Vanadium Titanium

摘　　要：采用酸洗、金相检测、能谱分析等方法,对高Nb、Ti含量钢坯在轧钢过程中的开裂原因进行研究,结果表明:大量析出的碳氮化物引起的内部微裂纹是造成高Nb、Ti含量钢开裂的直接原因。高温热塑性试验证实,高Nb、Ti含量钢在660～910℃下存在脆性温度区间。通过成分控制、稳定拉速、降低二冷段冷却速率以及稳定结晶器液面,可基本消除高Nb、Ti含量钢轧钢开裂现象。The causes of cracks in high Nb and Ti content billet in the process of steel rolling was investigated by pickling,metallography detection and energy spectrum analysis.The results show that the direct reason for crack forming is the inner microcracks caused by large amount of carbonitride separated out in the process.It is proved in the thermoplasticity test that there is a brittleness temperature range at 660～910 ℃ for the steel.The cracks can be avoided through controlling chemical compositions,stabilizing the casting speed and liquid level in the mold,and reducing the cooling rate in the secondary cooling.

关 键 词：高Nb、Ti钢 钢坯 开裂 热塑性 

分 类 号：TG142.15[一般工业技术—材料科学与工程]