论文部分内容阅读
基于夹杂物示踪剂法对国内某厂Q235B钢转炉—连铸生产工艺的各个环节展开了系统的研究和分析。结果表明:铸坯中夹杂物水平较高,二次氧化严重。其中显微夹杂物为Si O2-Mn O-Mn S、Si O2-Mn O-Mo O3等复合夹杂,未发现Ce、La等示踪元素;大型夹杂物中则普遍含有Ce、La、K、Na等示踪元素,说明其主要源于中间包覆盖剂,保护渣和钢包渣的卷入。大型夹杂物危害极大,需要从中间包、浸入式水口等反应器针对性的结构优化,冶炼浇铸工艺的稳定化和冶金辅料的性能优化三方面共同着手来实现大型夹杂物的去除。
Based on the inclusion tracer method, a domestic plant Q235B steel converter - continuous casting process of all aspects of a systematic study and analysis. The results show that the content of inclusions in slab is high and the secondary oxidation is serious. The microscopic inclusions are composite inclusions such as Si O2-Mn O-Mn S and Si O2-Mn O-Mo O3. Ce, La and other trace elements are not found. Among the large inclusions, Ce, La, K, Na trace elements, indicating that the main source of tundish covering agent, mold flux and slag involvement. Large inclusions are extremely harmful. It is necessary to proceed with the removal of large inclusions from three aspects: targeted structural optimization of reactors such as tundish and immersed nozzle, stabilization of smelting and casting process, and optimization of metallurgical auxiliary materials.