Investigation on Variation of Inclusions and Total Oxygen in IF Steel After RH Deoxidization  

作　　者：SHU Hong-fu1,2, LIU Liu1, LIU Xue-hua2, ZHANG Xiao-feng2 (1.Central Iron and Steel Research Institute, Beijing 100081, China 2. Technology Centre of Maanshan Iron and Steel Co Ltd, Maanshan 243000, Anhui, China) 

出　　处：《Journal of Iron and Steel Research International》2011年第S2期347-351,共5页

摘　　要：The variational regulation of inclusions and total oxygen in the IF Molten Steel during the RH refining process after deoxidization was studied. The results show that the relationship between total oxygen content and time is in accord with the following equation, T.O=271.25e-1.53t+23.49, R2=0.9966.The inclusion analysis investigation during RH pure circulation process indicates that the main inclusion of the IF molten steel after 2 minutes from the beginning of deoxidization is cluster inclusions of pure Al2O3 system. After 6 minutes from the aluminum deoxidization, the quantity of inclusion decreases and the inclusion style changes into block inclusions of Al2O3 system with the size of 5μm. In the other hand, some inclusions are of Al2O3-MgO. Complex inclusions of Al2O3-TiOx with the size of below 5μm, and the single particle or cluster complex inclusions with the typical square shape of Al2O3-TiN system are found after 3 minutes from titanium-ferrous alloy added. Then, the content of titanium of complex inclusions of Al2O3-TiOx decreases and the aluminum content rises along with the RH pure circulation time process. That means the inclusions of Al2O3-TiOx is not steady, and it trends to transfer into Al2O3.The variational regulation of inclusions and total oxygen in the IF Molten Steel during the RH refining process after deoxidization was studied. The results show that the relationship between total oxygen content and time is in accord with the following equation, T.O=271.25e-1.53t+23.49, R2=0.9966.The inclusion analysis investigation during RH pure circulation process indicates that the main inclusion of the IF molten steel after 2 minutes from the beginning of deoxidization is cluster inclusions of pure Al2O3 system. After 6 minutes from the aluminum deoxidization, the quantity of inclusion decreases and the inclusion style changes into block inclusions of Al2O3 system with the size of 5μm. In the other hand, some inclusions are of Al2O3-MgO. Complex inclusions of Al2O3-TiOx with the size of below 5μm, and the single particle or cluster complex inclusions with the typical square shape of Al2O3-TiN system are found after 3 minutes from titanium-ferrous alloy added. Then, the content of titanium of complex inclusions of Al2O3-TiOx decreases and the aluminum content rises along with the RH pure circulation time process. That means the inclusions of Al2O3-TiOx is not steady, and it trends to transfer into Al2O3.

关 键 词：IF steel INCLUSION RH refining 

分 类 号：TF703.5[冶金工程—钢铁冶金]