Abstract：Granular sample is common sample state for the determination of nitrogen content in laboratory on-the-spot analysis. However, bubble melt phenomena often appear during the analysis of stainless steel containing high content nitrogen, which seriously influences the determination accuracy of nitrogen. The factors influencing the determination of nitrogen content in granular stainless steel samples containing high content nitrogen by oxygen-nitrogen analyzer were discussed. The parameters those influenced the pulse fusion status of sample and determination accuracy of high content nitrogen were analyzed. It was found that the state of testing sample, total contents of gaseous elements in sample and the particularity of chemical components are major inherent influencing factors, which the heating rate in pulse fusion was an extrinsic influencing factor. Based on the analyses above, the heating procedures of pulse furnace were tested. The step heating mode which was suitable for the determination of nitrogen content in granular stainless steel sample containing high content nitrogen was proposed: the power of pulse furnace was increased from 1452W to 2176W within 25s; then the power was rapidly increased from 2176W to 4500W within 5s. The proposed step heating mode was applied for the determination of nitrogen content in heat-resisting stainless steel, duplex stainless steel and high strength non-magnetic stainless steel. Compared with the determination results of scrap samples by conventional methods, the difference value was less than repeatability limit r in national standard method.
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CAO Ji-xiang, REN Wei-ping, LIU Guo-feng, LIU Ai-kun. Influence of heating pattern on the determination of nitrogen in stainless steel granular sample containing high content nitrogen. , 2020, 40(7): 65-71.
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