|
|
|
| Oxygen transfer phenomenon between slag and molten steel for production of IF steel |
| Yun-qing Ji 1, Chun-yang Liu 2, Hui-xiang Yu 1, Xiao-xuan Deng 3, Fu-xiang Huang 2, Xin-hua Wang 1,3 |
| 1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2 Steelmaking Plant, Beijing Shougang Co., Ltd., Qian’an 100041, Hebei, China; 3 Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China |
|
|
|
|
Abstract FeO-containing slag originated from the basic oxygen furnace to the ladle is a major reoxidation source during the following secondary refining. Ladle slag reduction treatment (slag treatment) is one of the common countermeasures adopted to eliminate the steel contamination by FeO reoxidation. The oxygen transfer phenomenon between molten steel and slag was studied during the industrial production of interstitial-free (IF) steel, the measured and calculated oxygen activities in steel were compared, and the Fe–O equilibrium at the slag–molten steel interface was investigated by thermodynamic analysis. With slag treatment, the oxygen potential is higher in the molten steel than in the pre-deoxidation slag; this causes oxygen transfer from the molten steel to the slag, decreasing the efficiency of slag treatment. Based on this, a two-step slag deoxidation process was optimized. The second step further reduced the FeO content. On the other hand, the CaO/Al2O3 (C/A) ratio in the refining slag must be controlled, because it affects the FeO activity and inclusion absorption capacity of the slag. The results suggest that the C/A ratio of 1.2–1.5 and the FeO content of\ 6% are beneficial to refine IF steel.
|
|
|
|
|
|
| Cite this article: |
|
Yun-qing Ji,Chun-yang Liu,Hui-xiang Yu, et al. Oxygen transfer phenomenon between slag and molten steel for production of IF steel[J]. Journal of Iron and Steel Research International, 2020, 27(4): 402-408.
|
|
|
|
| [1] |
Ai‑jun Deng, Ding‑dong Fan, Hai‑chuan Wang, Can‑hua Li. Simulation research on oxygen mass transfer between steel and slag in IF steel refning process[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(4): 409-419. |
| [2] |
Long-yun Xu, ? Jian Yang ? Rui-zhi Wang ? Wan-lin Wang ? Yu-nan Wang. Effect of Mg addition on formation of intragranular acicular ferrite in heat-affected zone of steel plate after high-heat-input welding[J]. , 2018, 25(4): 433-441. |
| [3] |
Jae-hong Shin · Joo-hyun Park . Effect of CaF2 content in refining slag on formation behavior of spinel inclusion in Ni–Cr–V-alloyed special steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2018, 25(2): 157-163. |
| [4] |
Hai-yan Tang*,Yong Wang,Guang-hui Wu,Peng Lan,Jia-quan Zhang. Inclusion evolution in 50CrVA spring steel by optimization of refining slag[J]. Chinese Journal of Iron and Steel, 2017, 24(9): 879-887. |
| [5] |
Rui Wang,Yan-ping Bao,*,Yi-hong Li,Tai-quan Li,Di Chen. Effect of slag composition on steel cleanliness in interstitial-free steel[J]. Chinese Journal of Iron and Steel, 2017, 24(6): 579-585. |
| [6] |
Ya- jun HUI,Yang YU,Lin WANG,Chang WANG,Wen- yuan LI,Bin CHEN. Strain- induced Precipitation in Ti Micro- alloyed Interstitial- free Steel[J]. Chinese Journal of Iron and Steel, 2016, 23(4): 385-392. |
|
|
|
|
2020, Vol. 27 
