摘要
针对板坯连铸机生产Q235B等钢种不时出现的中间裂纹问题,通过现场设备工艺数据统计和针对性生产试验,分析比较了影响板坯中间裂纹程度的相关影响因素。试验结果表明：拉坯速度、冷却强度、钢水成分、设备辊缝精度与铸坯中间裂纹的发生率均有密切关联。其中设备辊缝精度是影响中间裂纹的主要影响因素。现有条件下,合理的控制拉速可以防止铸坯中间裂纹的发生;提高钢中锰硫比、优化二冷水表也可以在一定程度上降低铸坯中间裂纹的评级。
Aiming at the frequently occurred mid-way crack defects in slab castings of steel Q235B, the influence fac- tors have been investigated through production experiments and quality analysis. It is shown that the mid-way crack in- dex is closely related to factors such as casting speed, secondary cooling intensity, steel composition and roll gap align- ment. Among them, the roll gap factor is of special importance. Under the present conditions, the mid-way crack can be effectively controlled by proper casting speed, Mn/S ratio and improved secondary cooling strategy.
作者
王璞
韩庚维
孙福龙
李亮
蒋宪勋
包伟峰
兰鹏
张家泉
WANG Pu;HAN Geng-wei;SUN Fu-long;LI Liang;JIANG Xian-xun;BAO Wei-Feng;LAN Peng;ZHANG Jia-quan(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Jilin Jianlong Iron and Steel Co.,Ltd.,Jilin 132104,Jilin,China)
出处
《连铸》
2018年第4期77-82,共6页
Continuous Casting
关键词
连铸
板坯
中间裂纹级别
continuous casting
slab
mid-way crack index
