|
|
Influence of refining process and utilization of different slags on inclusions, titanium yield and total oxygen content of Ti-stabilized 321 stainless steel |
Xing-run Chen1,2, Guo-guang Cheng1, Yu-yang Hou1, Jing-yu Li1, Ji-xiang Pan2 |
1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
2 Hongxing Iron and Steel Co., Ltd., Jiuquan Iron and Steel Group Corporation, Jiayuguan 735100, Gansu, China |
|
|
Abstract Ti-stabilized 321 stainless steel was prepared using an electric arc furnace, argon oxygen decarburization (AOD) furnace, ladle furnace (LF), and continuous casting processes. In addition, the effect of refining process and utilization of different slags on the evolution of inclusions, titanium yield, and oxygen content was systematically investigated by experimental and thermodynamic analysis. The results reveal that the total oxygen content (TO) and inclusion density decreased during the refining process. The spherical CaO–SiO2–Al2O3–MgO inclusions existed in the 321 stainless steel after the AOD process. Moreover, prior to the Ti addition, the spherical CaO–Al2O3–MgO–SiO2 inclusions were observed during LF refining process. However, Ti addition resulted in multilayer CaO–Al2O3–MgO–TiOx inclusions. Two different samples were prepared by conventional CaO–Al2O3-based slag (Heat-1) and TiO2-rich CaO–Al2O3-based slag (Heat-2). The statistical analysis revealed that the density of inclusions and the TiOx content in CaO–Al2O3–MgO–TiOx inclusions found in Heat-2 sample are much lower than those in the Heat-1 sample. Furthermore, the TO content and Ti yield during the LF refining process were controlled by using TiO2-rich calcium aluminate synthetic slag. These results were consistent with the ion–molecule coexistence theory and FactSage™7.2 software calculations. When TiO2-rich CaO–Al2O3-based slag was used, the TiO2 activity of the slag increased, and the equilibrium oxygen content significantly decreased from the AOD to LF processes. Therefore, the higher TiO2 activity of slag and lower equilibrium oxygen content suppressed the undesirable reactions between Ti and O.
|
Received: 22 May 2019
Published: 25 August 2020
|
|
|
|
Cite this article: |
Xing-run Chen,Guo-guang Cheng,Yu-yang Hou, et al. Influence of refining process and utilization of different slags on inclusions, titanium yield and total oxygen content of Ti-stabilized 321 stainless steel[J]. Journal of Iron and Steel Research International, 2020, 27(8): 913-921.
|
|
|
|
[1] |
Jian‑fei Xu 1 , Kun‑peng Wang 1 , Ying Wang 1 , Zhi‑dong Qu 1, Xing‑kuang Tu 1 . Effects of ferrosilicon alloy, Si content of steel, and slag basicity on compositions of inclusions during ladle furnace refining of Al-killed steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(9): 1011-1017. |
[2] |
Wan‑lin Wang, Guo‑min Ying, Jie Zeng, Hai‑hui Zhang. Effect of electropulsing treatment on solidification behavior of spring steels in a continuous casting mold simulator[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(6): 656-664. |
[3] |
Bai‑song Li, Wen‑zhi Chen, Yu‑lin Zhao, Pei Zhao. Evolution and control of nonmetallic inclusions in FeSiB alloy[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(5): 588-597. |
[4] |
Jin‑long Lu, Guo‑guang Cheng, Meng Wu, Guo Yang, Ju‑long Che. Detection and analysis of magnetic particle testing defects on heavy truck crankshaft manufactured by microalloyed medium-carbon forging steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(5): 608-616. |
[5] |
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. |
[6] |
Dong-ping Zhan, Guo-xing Qiu, Chang-sheng Li, Min Qi, Zhou-hua Jiang, Hui-shu Zhang. Effects of yttrium and zirconium additions on inclusionsand mechanical properties of a reduced activation ferritic/martensitic steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(2): 197-207. |
|
|
|
|