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Nitrogen desorption from pure iron melts under reduced pressure
Author(s) -
Harada Toshiya,
Janke Dieter
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198901665
Subject(s) - desorption , mass transfer , nitrogen , chemistry , diffusion , sulfur , oxygen , phase (matter) , metallurgy , inorganic chemistry , analytical chemistry (journal) , thermodynamics , materials science , adsorption , environmental chemistry , chromatography , organic chemistry , physics
More recently, lower nitrogen contents of steel are required in view of its workability and applicability. The present study covers basic investigations on the improvement of mass transfer in denitrogenation of steel melts under vacuum. Extensive reduction of the contents of the surface‐active elements oxygen and sulfur is a precondition to increase the rate of nitrogen desorption. Kinetics of nitrogen transfer is reliably described by a mixed control model which includes diffusion in the melt, interfacial reaction and diffusion in the gas phase. Particularly at low oxygen and sulfur contents, mass transfer of nitrogen during desorption from steel melts is markedly accelerated. A convincing explanation of this phenomenon has not been found yet.