不同工艺路线超低碳钢洁净度分析

来源期刊：钢铁2009年第5期

论文作者：常桂华 栗红 陈本文 赵刚 王向辉

文章页码：19 - 22

关键词：连铸方式； 超低碳钢； 洁净度

Key words：continuous casting modes； ultra-low carbon steel； clean degree

摘    要：针对厚板坯和中薄板坯连铸两条工艺路线生产的超低碳钢,采用相关手段分析了钢水从钢包到中间包的二次氧化、稳态和非稳态铸坯全氧、总体夹杂物水平、铸坯大颗粒夹杂物比例等。结果表明,两种工艺路线生产的超低碳钢在稳态浇注时铸坯洁净度基本一致;非稳态浇注时中薄板生产线钢水洁净度低于厚板坯连铸;受中薄板连铸结晶器和水口形状的制约,其水口结瘤现象较厚板坯连铸严重得多。作为中薄板连铸向薄板坯连铸的过渡,若在薄板坯连铸生产线实现正常浇注超低碳钢,进一步提高钢水洁净度、设计合理的浸入水口结构、稳定的连铸操作是亟待解决的问题。

Abstract: According to the ULC steel adapting the thick slab and medial-thin slab production technology respectively,some methods were introduced to analyze secondary oxidation of molten steel from ladle to tundish,total oxygen of steady state and non-steady state,inclusions level and ratio of large size inclusions,etc.The results indicated that the clean degree of ULC slab adapting two production technology was approximately consistent at the steady state casting;during the non-steady state casting process,the clean degree of medial-thin slab was much lower than that of thick slab casting.Restricted by mould and shape of submerge nozzle,the thin-slab casting blocking was more serious than thick slab casting.As transition from medial-thin slab to thin slab continuous casting,as if in the thin slab continuous casting production lines achieve normal casting ultra-low carbon steel,it must urgently solve the problem that should further improve the clean degree of molten steel,design reasonable structure of SEN and steadily operate continuous casting.