Abstract
A calibration method for determining the nitrogen content in steel by a thermo-conductimetric method after fusion in the current of an inert gas is proposed. In this calibration method, a pure chemical substance whose nitrogen content can be calculated based on its molecular weight is used as a calibrant. The nitrogen recovery and thermostability of 9 chemical substances in the fusion procedure were investigated; it was found that potassium nitrate is the most suitable as a calibrant. The results of analysis of 9 steel samples of certified reference materials demonstrate that the proposed calibration method is applicable to determination of nitrogen contents between 0.001% and 0.5%.
