摘要
介绍了华菱集团湘潭钢铁公司方/板坯连铸机浇铸矩形坯二冷制度上存在的问题,分析了引起矩形坯皮下角部裂纹的主要原因。对连铸矩形坯的二冷制度进行了优化,并取得了显著的效果。生产实践表明,矩形坯内部角裂基本消除,低倍合格率由优化前的24.7%提高到97.7%,中心疏松在1.0级以下的比例由52.1%提高到98.9%;因钢质问题造成的利用品率由15.8%降低到0.81%;协议材比例由22.9%减少到0.72%。
In this paper, the defects existing in the secondary cooling scheme of the rectangular bloom/slab combi-caster in Valin Xiangtan Iron ＆ Steel Co. , Ltd. , are described, the reasons for internal corner cracks of rectangular bloom analyzed, and the secondary cooling parameters optimized. The production practice indicates that the secondary cooling scheme has already been optimized and excellent results achieved as well The internal corner cracks of the rectangular bloom are eliminated basically, the proportion of qualified macroscopic sample increased from 24. 7%to 97.7%, the ratio of the central segregation （≤1. 0） increases from 52. 1% to 98. 9% ;and the unqualified rate of round-rod rolling steels caused by the defects in rectangular bloom reduced from 38. 7% to 1.53%.
出处
《炼钢》
CAS
北大核心
2009年第5期12-15,共4页
Steelmaking
关键词
方/板坯连铸机
二冷制度
优化
rectangulat bloom/slab combi-caster
secondary cooling scheme
optimization
