【作者】 陈永； 张大德； 吴国荣； 杨素波；

【Author】 Chen Yong~1 Zhang Dade~2 Wu Guorong~1 Yang Subo~3 (1.Pangang Group Research Institute Co.Ltd.,Panzhihua 617000,Sichuan,China; 2.Panzhihua Steel & Vanadium Co.ltd.,Pangang Group Panzhihua 617067 Sichuan,China; 3.Pangang Group Panzhihua Steel and Vanadium Co.Ltd.Panzhihua 617062 Sichuan,China)

【机构】 攀钢集团研究院有限公司； 攀钢集团有限公司； 攀钢集团攀枝花钢钒有限公司；

【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的问题,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。大生产应用表明,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～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。更多还原

【Abstract】 According to the problems of bad castability of molten steel,surface longitudinal cracks and the difficulty of elimination for internal defects of billet in rolling process because of small compression ratio,and combining with the characteristics of the new caster,the technologies of continuous casting process and quality control for square/round billet have been studied systematically. On this basis,integrated techniques of continuous casting process and quality control for billets are proposed,containing castability optimization,surface and internal quality improvement of billets.Large scale production application shows that the continuous casting heats in a single tundish is increased from 4～5 heats to 7～8 heats.The non-defect rates of surface quality reach 98.91%and 97.81%for square billet and round billet,respectively.The comprehensive rates below level 1.0 of internal defects of center porosity, center segregation and center cracks are above 98.9%%and 98.5%for square billet and round billet,respectively.Furthermore, carbon segregation index is in the range of 0.93～1.09.The results obtained provide technology supports for the operation of new caster,improvement of billet quality,as well as steel grade development.更多还原