Abstract
It was experimented to see whether the AlN affected the results and to finl a method of eliminating its effect, when the oxygen in high-nitrogen steel was determined. By this research, the following facts were found:(1) It was observed that when the oxygen was analysed in the sample of steel, whose N2 content was high (N2 content over 0.010%), by the ordinary Herty's method, a certain quantity of AlN remained together with Al2O3, due to its difficulty of being solved in acid; and that accordingly, it made the resultant figures higher and also induced a fluctuation of the results.(2) The counter-measure for it was found better to eliminate the effect of AlN only by treating the Al2O3+AlN residue with the solution of NaOH (3%). By this method the authors obtained the true value. Consequently, it became clear that NaOH solution treatment was absolutely necessary for such sample, and thus the procedure of the Herty's method of high-N2steel was established too.
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