Influence of the flux composition and state of the gas atmosphere over the kinetics of nitrogen absorption by steels and alloys at the arc slag remelting

In the work are represented the results of fundamental investigations of the kinetics of nitrogen absorption depending on state of the gas atmosphere and composition of the flux applied at the induction and are melting. Are given the calculated and experimental relations of nitrogen absorption by liquid metal from the gas phase within the atmosphere of nitrogen with different concentration of oxygen, performed on the basis of application of modern methods of devitation and are meltings. It is shown that along with increasing of the oxygen content in the gas phase reauces the speed of nitrogen absorption independently from the applied means of melting (the induction or are one). The data obtained on the grounds of the theoretical caiculations and laboratory investigations have been confirmed by the results of the experimental and industrial testing with respect the are slag remelting technology (ASR). It is shown that chemical composition of the flux considerably influences over the kinetics of nitrogen absorption by liquid metal, and along with increasing the quantity of oxides in it reduces the speed of nitrogen absorption by metal. It has been also established the dependence of the grade of metal saturation with nitrogen at the ASR for different depth of the slag pool. The investigations having been carried out allowed detect and precise the extent of influence of different technological parameters over saturation of metal with nitrogen and showed that keeping to optimum technological schedules of remelting it is possible alloy metal by nitrogen from the gas phase until the concentrations close to standard solubility and confirmed high effectiveness of the means of nitrogen alloying immediately from the gas phase within the ASR process.