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The aim of this study was to test and analyse the possibilities offered by the technique of vacuum injection of oxidizing powder in order to remove nitrogen metal or to obtain ultralow carbon contents. We examined the nitrogen removal of a steel containing initially 300E-3% C and between 68E-4% N(2) and 145E-4% N(2). It then appears that the injection of powder makes it possible to reach final levels of 30E-4% N(2) instead of levels between 50E-4% N(2) and 70E-4% N(2) without injection. The kinetics of nitrogen removal are increased when the specific flowrate of the gas going through the metal increased.
Decarburization tests have shown that, starting from an approximate initial content of 200E-4%, it was possible to reach carbon levels of between 12E-4% and 40E-4% through the injection of oxidizing powder. Without powder injection, the final content is approximately 170E-4%. The study of the kinetics of decarburization of steel containing initially 150E-4% of carbon and between 500E-4% and 900E-4% of dissolved oxygen without powder injection, shows that the kinetics of the boiling step of the decarburization is improved by an increase in the pressure drop rate. These tests showed the technological feasibility of this method and its efficiency for producing steels having very low nitrogen and carbon contents.

Additional information

Authors: ZBACZYNIAK Y, Institut de Recherches de la Sidérurgie Française Maizères-lès-Metz (FR)
Bibliographic Reference: EUR 15711 FR (1996) 38pp., FS, ECU 7
Availability: Available from the (2)
ISBN: ISBN 92-827-6461-3
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