A deoxidation thermodynamic model for 304 stainless steel considering multiple-components coupled reactions
Yan Yan1,2, Guang-hao Shang3,4, Li-ping Zhang3,4, Shao-ying Li1,2, Han-jie Guo1,2
1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083, China 3 Henan Jinhui Stainless Steel Industry Group Co., Ltd., Xuchang 461500, Henan, China 4 Changge Jinhui Recycling Metal R&D Co., Ltd., Xuchang 461500, Henan, China
A deoxidation thermodynamic model for 304 stainless steel considering multiple-components coupled reactions
Yan Yan1,2, Guang-hao Shang3,4, Li-ping Zhang3,4, Shao-ying Li1,2, Han-jie Guo1,2
1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083, China 3 Henan Jinhui Stainless Steel Industry Group Co., Ltd., Xuchang 461500, Henan, China 4 Changge Jinhui Recycling Metal R&D Co., Ltd., Xuchang 461500, Henan, China
摘要 A thermodynamic model for predicting the equilibrium oxygens of 304 stainless steel was developed based on the theory of slag–steel equilibrium, the law of mass conservation, and the ion and molecule coexistence theory. In the developed model, the Fe–Cr–Mn–Si–Al–S–O–melts reaction system and CaO–MgO–CaF2–FeO–MnO–Al2O3–SiO2–Cr2O3 slags were considered. The oxygen contents calculated by the model are in good agreement with experimental results and reference data. The equilibrium oxygen contents in 304 stainless steel mainly decrease with increasing binary basicity (w(CaO)=w(SiO2), where w(i) is the mass percentage of component i) and decreasing temperature. Controlling binary basicity at 2.0 while maintaining temperatures lower than 1823 K will keep the oxygen contents in the 304 stainless steel lower than 15 × 10–6. The equilibrium oxygen contents may also be decreased with increasing content of MgO in slags, which is more significant at lower binary basicity. Besides, a small amount of FeO, MnO, and Al2O3 (about 0–2.5 wt.%) in slags has little effect on equilibrium oxygen contents. Furthermore, it is found that the [C]–[O] reaction may occur during refining process but will not significantly affect the equilibrium oxygen contents.
Abstract：A thermodynamic model for predicting the equilibrium oxygens of 304 stainless steel was developed based on the theory of slag–steel equilibrium, the law of mass conservation, and the ion and molecule coexistence theory. In the developed model, the Fe–Cr–Mn–Si–Al–S–O–melts reaction system and CaO–MgO–CaF2–FeO–MnO–Al2O3–SiO2–Cr2O3 slags were considered. The oxygen contents calculated by the model are in good agreement with experimental results and reference data. The equilibrium oxygen contents in 304 stainless steel mainly decrease with increasing binary basicity (w(CaO)=w(SiO2), where w(i) is the mass percentage of component i) and decreasing temperature. Controlling binary basicity at 2.0 while maintaining temperatures lower than 1823 K will keep the oxygen contents in the 304 stainless steel lower than 15 × 10–6. The equilibrium oxygen contents may also be decreased with increasing content of MgO in slags, which is more significant at lower binary basicity. Besides, a small amount of FeO, MnO, and Al2O3 (about 0–2.5 wt.%) in slags has little effect on equilibrium oxygen contents. Furthermore, it is found that the [C]–[O] reaction may occur during refining process but will not significantly affect the equilibrium oxygen contents.
Yan Yan,Guang-hao Shang,Li-ping Zhang, et al. A deoxidation thermodynamic model for 304 stainless steel considering multiple-components coupled reactions[J]. Journal of Iron and Steel Research International, 2024, 31(1): 74-91.
2024, Vol. 31 
