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Synopsis : Nitrogen extraction curve obtained by the hydrogen hot extraction (HHE) technique was discussed from a view point of diffusion of nitrogen in steel. By a numerical analysis, a theoretical temperature-extraction curve was obtained on the assumption that the rate-determining reaction was the diffusion of dissolved nitrogen in steel and by using the measured particle size of the test sample and the heating rate of the routine HHE analysis as a base of the calculation. And the time required for extraction of nitrogen at different temperature was calculated. The theoretical curve was very similar to the one obtained by the experiment. It was proven that the particle size and the heating rate, which had been adopted for the routine HHE analysis, were satisfactory for the HHE differential determination between free nitrogen and precipitated nitrogen in steel.

A Kinetic Discussion on Nitrogen Extraction Curve Obtained by Using Hydrogen Hot Extraction Technique