Effects of temperature and [S] on the kinetics of nitrogen removal from liquid steel

Abstract

Abstract: The kinetics of denitrogenation from liquid steel was studied by using an oxygen-nitrogen analysis system(LECO TC-436) under 1600℃ similar to 2813℃ conditions. The results show that when [S]=0.005%, nitrogen removal was controlled by nitrogen transfer in liquid diffusion layer, when [S]=0.012% and 0.140%, it was controlled by both nitrogen transfer in liquid diffusion layer and the chemical reaction at the liquid-gas interface below 2250℃, and by nitrogen transfer in liquid diffusion layer under 2250℃ similar to 2813 degreesC conditions. The activation energy E-a was 57 kJ/mol for 0.0050%[S], 95 kJ/mol for 0.012%[S], 165 kJ/mol for 0.140%[S]. The resistance of sulphur on nitrogen removal decreased with the temperature rose, and disappeared at 2630℃. Based on the results obtained, it has been answered why the nitrogen in liquid steel can be decreased rapidly by carbon-oxygen reaction under very high oxygen and sulphur content conditions during the BOF, EAF, VOD and AOD steelmaking processes.

Key words:

Jie FU, Shixiang ZHOU, Ping WANG, Lin DI, Jian ZHU. Effects of temperature and [S] on the kinetics of nitrogen removal from liquid steel[J]. J Mater Sci Technol, 2001, 17(02): 233-236.

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Effects of temperature and [S] on the kinetics of nitrogen removal from liquid steel

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