SYUDY OF GAS DEPHOSPORIZATION PROCESSES OF IRON-BASED MELTS UNDER CONDITIONS OF PLASMA MELTING AT EXPENSE OF TREATMENT BY NITROGEN AND BY CARBON VAPOURS

There the study objects are iron melts with different content of phosphorus (0,12; 0,5; 0,7%), 08Kh18N10 corrosion-resistant steel. The purpose is to study the gas dephosphorization processes of iron-based melts, which take place under the plasma melting at the expense of treatment by active mitrogen and by carbon vapours. The experimental melting has been realized by the laboratory arc-heated plasma chamber. The PGS-2 spectrograph with the plane diffraction grating has been used to record the radiation spectra of plasma. The phosphorus has been determined by the photocolorimetrical method. The dephosphorization degree equals 30 - 40%. The influence of composition of gas phase and of total pressure on the processes of gas dephosphorization has been studied. It was ascertained that most preferable treatment from the kinetic standpoing is the joint one of melt by the nitrogen and by the carbon vapours. The increase of partial pressure of nitrogen up to 0,02 at and of total pressure up to 1,0 at promotes the removal of phosphorus. The negative influence of oxygen of metal on the processes of gas dephosphorization has been brought out. The mechanism of removal of phosphorus has been offered. The foundations of new dephosphorization manner of metal have been developedAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio