Abstract：Based on the determination of oxygen and nitrogen in steel material by pulse heating-infrared absorption and thermal conductivity method, fast determination of oxygen, nitrogen and hydrogen was realized by individual instrument through fast switching of carrier gas. The effect of pulse heating condition, flux and crucible was mainly studied to determine the optimum analysis conditions, including 2 300 W of analysis power, adding 1 tin sheet for fusion and the application of outer-inner crucible for determining hydrogen. Calibration curve was drawn by determining oxygen, nitrogen and hydrogen standard sample. By calculating the standard deviation of blank reagent, the detection limit of oxygen, nitrogen and hydrogen was obtained as 0.000 027%, 0.000 021% and 0.000 015%, respectively. The analysis scope of oxygen, nitrogen and hydrogen was 0.000 09%-0.2% and 0.000 07%-0.2% ;and the analysis scope of hydrogen was 0.000 05%-0.05%. Sample with low amount of oxygen, nitrogen and hydrogen was conducted with precision study, with RSD (n=11) of these three elements were less than 5%. The testing results of practical steel sample were consistent with those of other instrument, meeting the requirement of gas analysis in steel material.
于燕鹏,胡少成,马红权,吴振宁,黄小峰,胡学强,王蓬. 脉冲熔融-红外吸收热导法测定钢铁材料中氧氮和氢[J]. 冶金分析, 2014, 34(10): 32-36.
YU Yan-peng,HU Shao-cheng, MA Hong-quan, WU Zhen-ning HUANG Xiao-feng, HU Xue-qiang, WANG Peng. Pulse heating-infrared absorption and thermal conductivity method for the determination of oxygen, nitrogen and hydrogen in metallic materials. , 2014, 34(10): 32-36.
Joseph J Kreuser,Thomas W Junker,Richard A Fork.Simultaneous measurement of hydrogen,nitrogen and oxygen in molten steel[J].AISTech Proceedings,2004,1:821-829.
