日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 10 (1968),
pp. 1035-1040

Determination of Nitrogen in Carbon and Alloy Steels by Carrier Gas Fusion-Thermal Conductivity Method

Hidehiro Gotô1 and Minoru Hosoya1

1The Research for Iron, Steel and Other Metals, Tohoku University, Sendai

Abstract:

In the analysis of nitrogen in metals by the vacuum fusion or the carrier gas fusion method, lower values have generally been obtained than those of the wet method, because the surface of the melt is covered with a graphite layer deposited and the evolution of gas from the sample becomes difficult.
Therefore, we have attempted to eliminate such interference of the graphite, using the MgO lining-graphite crucible. The results of determination of nitrogen by the proposed method was in good agreement with those by the chemical method and it was confirmed that even in the case of the sample containing Al, nitrogen was quantitatively extracted without any influence of gettering.
The time required for a single determination was about 5 to 8 minutes.


(Received 1968/5/30)

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