含硫含铝钢浇铸结瘤原因分析及改进  

Improvement on the SEN clogging of sulfur-bearing Al-killed steel

作　　者：翟万里 左辉 马建超[1] 印传磊 ZHAI Wanli, ZUO Hui, MA Jianchao, YIN Chuanlei(Jiangsu Shagang Group Huaigang Special Steel Stock Co. ,Ltd, Huaian 223002, Chin)

机构地区：[1]江苏沙钢集团淮钢特钢股份有限公司,江苏淮安223002

出　　处：《炼钢》2018年第2期19-24,共6页Steelmaking

摘　　要：对含硫含铝齿轮钢连铸结瘤原因进行了分析,并通过工艺优化改善了钢水可浇性,得出如下结论:1)含硫含铝齿轮钢中CaS与高熔点的Ca-Al-Mg-O复合夹杂物是引起浇铸结瘤的主要原因;2)变性处理及喂入硫线后,夹杂物化学成分及液化程度主要受钢中氧硫比决定,提高钢中氧含量有利于提高夹杂物中CaO比例,改善钢水可浇性;3)采用弱脱氧工艺,夹杂物中CaO比例明显提高、CaS比例大幅降低,可显著改善含硫含铝齿轮钢钢水可浇性,连浇炉数由2~4炉提升至7炉以上。SEN cloggings of Al-killed resulfurized gearing steel after calcium treatment were analyzed.And the castability of molten steel was improved by optimizing the process.The results showed that SEN clogging was mainly caused by the CaS and Ca-Al-Mg-O inclusions with high melting-point.The inclusion composition in the Al-killed resulfurized gearing steel wass mainly depended on the ratio of[O]content to [S]content in the steel after Ca-treatment and sulphur addition.By raising the[O]content,CaO contnets in inclusions increased and the castablity of the molten steel was improved.Under the condition of weaker deoxidization process,CaO content increases and CaS content decreases in inclusions.As a result,castability of molten steel improved greatly,with the continuous casting heats increased from 4 to 7 or more.

关 键 词：含硫含铝钢 氧含量 夹杂物成分 水口结瘤 

分 类 号：TF777[冶金工程—钢铁冶金]