Jie Fu, Heming Chang, Shixiang Zhou, and Boping Chen, Kinetics of Nitrogen Removal from Molten Steel under Vacuum and Gas-Blowing Conditions, J. Univ. Sci. Technol. Beijing, 5(1998), No. 1, pp. 5-8.
Cite this article as:
Jie Fu, Heming Chang, Shixiang Zhou, and Boping Chen, Kinetics of Nitrogen Removal from Molten Steel under Vacuum and Gas-Blowing Conditions, J. Univ. Sci. Technol. Beijing, 5(1998), No. 1, pp. 5-8.
Jie Fu, Heming Chang, Shixiang Zhou, and Boping Chen, Kinetics of Nitrogen Removal from Molten Steel under Vacuum and Gas-Blowing Conditions, J. Univ. Sci. Technol. Beijing, 5(1998), No. 1, pp. 5-8.
Citation:
Jie Fu, Heming Chang, Shixiang Zhou, and Boping Chen, Kinetics of Nitrogen Removal from Molten Steel under Vacuum and Gas-Blowing Conditions, J. Univ. Sci. Technol. Beijing, 5(1998), No. 1, pp. 5-8.
The kinetics of nitrogen removal from molten steel under vacuum and gas-blowing conditions has been studied during the VIM process. The experimental results indicated that vacuum affected the kinetics of nitrogen removal in the range of 67~5 360 Pa. At 67 Pa, the rate of nitrogen removal is controlled by the liquid phase mass transfer of nitrogen in molten steel. At 2 680Pa, the limited step for nitrogen removal from molten steel is the chemical reaction at the metal/gas interface. Under the present experimental conditions, the type (Ar, CO, CO2) and quantity of gas flowed have no evident influences on the rate of nitrogen removal. The ratio of nitrogen removal of gas bubbles is less than 3%. Based on the experimental results, the mechanism of nitrogen removal during the VD process with argon blowing and the other melting or secondary refining processes with carbon-oxygen reaction have been discussed. Some new viewpoints are proposed.