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Effect of Oxidizing Slag on Cleanliness of IF Steel during Ladle Holding Process
Author(s) -
Qin Yiming,
Wang Xinhua,
Li Linping,
Huang Fuxiang
Publication year - 2015
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201400349
Subject(s) - ladle , slag (welding) , metallurgy , oxidizing agent , materials science , process (computing) , liquid steel , refining (metallurgy) , steelmaking , chemistry , organic chemistry , computer science , operating system
The effect of oxidizing slag on cleanliness of IF steel produced by ShouGang during ladle holding process was investigated by comparing the differences of slag composition, steel composition and inclusion morphology between two processes of different slag oxidability(Process‐A < Process‐B). The results showed that, the reoxidation of slag to steel was observed during holding process, and Process‐A with the lower slag oxidability was more helpful to improve the cleanliness of molten steel during holding process by comparing the T.O of the two processes. Due to the slag reoxidation during holding process, the large petal shaped and dendritic Al 2 O 3 inclusions generated for Process‐A, and both the numbers of Al 2 O 3 and Al 2 O 3 ‐Ti x O inclusions increased significantly for Process‐B. In order to slow down reoxidation rate and improve the ability of slag to absorb inclusions, (FeO) content should be reduced and (CaO)/(Al 2 O 3 ) should be increased in the case of liquid slag. In conclusion, whether prolonging ladle holding time should depend on (FeO) content, (CaO)/(Al 2 O 3 ) etc. parameters of slag and initial T.O of molten steel.