高硅控铝钢中铝含量与夹杂物成分控制  

Control Technology of Aluminum Content and Inclusion Composition in High-silicon and Aluminum-controlled Steel

作　　者：翟万里 张洪才[1] 肖梦旋 许正周 Zhai Wanli;Zhang Hongcai;Xiao Mengxuan;Xu Zhengzhou(Jiangsu Shagang Group Huaigang Special Steel Stock Co.,Ltd.,Huaian 223002,China)

机构地区：[1]江苏沙钢集团淮钢特钢股份有限公司,淮安223002

出　　处：《特殊钢》2025年第2期67-71,共5页Special Steel

摘　　要：通过工业试验研究了高硅控铝钢中Al含量、非金属夹杂物化学成分控制工艺,结果表明,采用碱度在1.5以下的低碱度渣系可将钢中w[Al]控制在0.004%以内,采用碱度2.5~3.5的高碱度渣系钢液w[Al]>0.006%。渣中Al_(2)O_(3)含量降低有利于抑制冶炼过程钢液增Al量。低碱度渣系钢中氧化物夹杂物成分为SiO_(2)-MnO-Al_(2)O_(3)-MgO-CaO系,达到夹杂物塑性化的控制目的。高碱度渣系钢中氧化物夹杂成分为Al_(2)O_(3)含量较高的Al_(2)O_(3)-SiO_(2)-MgO-CaO系,夹杂物塑性变形能力不足。虽然低碱度渣系在LF精炼过程脱氧能力不足,但经过RH真空处理后,仍然能得到w[O]<0.0012%、夹杂物尺寸细小的高洁净度钢。In present paper,the control technology of aluminum content and inclusion composition was analyzed for high-silicon and aluminum-controlled steel by technological test.The results showed that content of A1 in steel can he controlled within 0.0040% by using low basicity slag with alkalinity below 1.5,while the A1 content is higher than 0.006% by using high basicity slag with basicity 2.5-3.5.The decrease of A1203 content in slag is beneficial to decrease the amount of A1 increase in molten steel.The oxide inclusion component in low basicity slag steel is SiO_(2)-MnO-Al_(2)O_(3)-MgO-CaO series,which achieves the control of inclusion plasticization.The oxide inclusion component in high basicity slag steel is Al_(2)O_(3)-SiO_(2)-MgO-CaO series with high Al_(2)O_(3)content,and the plastic deformation ability of the inclusion material is insufficient.High clean steel with oxygen content less than 0.0012% and fine inclusions can be obtained after KH control processing,although deoxygenation effect of the steel with low basicity slag is poor in the refining process.

关 键 词：炉渣碱度 AL含量 夹杂物成分 塑性夹杂 

分 类 号：TF769.2[冶金工程—钢铁冶金]