方圆坯连铸工艺及质量控制技术研究  

Key Technologies for Square/Round Billet Continuous Casting

作　　者：陈永[1] 吴国荣[1] 潘红[1] 黎建全 

机构地区：[1]攀钢集团研究院有限公司,四川攀枝花617000 [2]攀钢集团攀枝花钢钒有限公司,四川攀枝花617067

出　　处：《钢铁钒钛》2013年第2期54-61,共8页Iron Steel Vanadium Titanium

摘　　要：针对方圆坯连铸钢水可浇性差,圆坯表面纵裂趋向严重以及因压缩比较小、铸坯内部缺陷难以在轧制工序消除等问题,结合攀钢钒公司新建六机六流方圆坯连铸机的装备特点,从改善连铸钢水可浇性、提高铸坯表面质量和内部质量三个方面,系统研究了方圆坯连铸工艺及相关技术,形成了一系列涵盖连铸工艺与设备的提高钢水质量和铸坯质量的综合控制技术。工业生产应用表明,单中包连浇炉数由原来的平均4～5炉提高到8～10炉;方坯和圆坯表面无缺陷率分别达到98.91%和97.81%;方坯、圆坯中心疏松、中心偏析、中心裂纹等内部缺陷均小于1.0级的综合比例分别达到98.9%和98.5%,铸坯碳偏析指数为0.93～1.09。研究结果为方圆坯连铸机顺利投产、稳定生产以及提高铸坯质量和扩大连铸品种提供了重要的技术支撑。Main problems associated with square/round billet continuous casting include poor castability of molten steel, longitudinal surface cracks of round billet as well as internal strand defects which are dif- ficult to eliminate during rolling due to low compression ratio. To increase castability of molten steel and improve strand surface and internal quality of the new 6 - machine and 6 - strand square/round billet caster, continuous casting processes of square/round billet and associated technologies were systematical- ly studied. As a result, integrated technologies covering continuous casting processes and equipments for improving molten steel and strand quality were proposed. Large scale production application of the tech- nologies shows that sequence casting heats in a single tundish can be increased from 4 ~ 5 heats to 7 - 8 heats ; defect free rates of square and round billet surface can reach 98.91% and 97.81% respectively. The comprehensive rates of internal defects （such as center porosity, center segregation and center cracks） less than level 1.0 for the square and round billet are above 98.9% % and 98.5% respectively. Furthermore, carbon segregation index is in the range of 0.93 - 1.09. The results obtained provide sig- nificant technological supports for the operation of the new caster, improvement of billet quality, and de- velopment of new steel grades.

关 键 词：连铸 方圆坯 钢水质量 表面质量 内部质量 

分 类 号：TF777[冶金工程—钢铁冶金]