Abstract
Desulphurization of molten ferritic stainless steel (25%Cr-Fe alloy) was studied by using plasma jet of hydrogen-argon gas mixture to which powders of various calcium bearing fluxes were supplied.The fluxes used were (6-17) wt%CaC2-CaF2, 20wt%CaO-CaF2 and 12wt%CaC2-(18-35) wt%CaO-CaF2, the diameters of powder particles were smaller than 149μm, and the powder feeding rates were 0.1 to 0.9g/min. The results were summarized as follows: 1) the desulphurization efficiency of CaC2 in CaC2-CaF2 was 30-40%, and the minimum sulphur concentrations attained were as low as 0.0007% by CaO-CaF2 and 0.0013% by CaC2-CaF2, 2) hydrogen in the plasma, which reacted with CaC2 to form hydro-carbon gases, effectively enhanced desulphurization, preventing the carburization from CaC2, but retarded the desulphurization above pH2=0.5atm by forming gaseous calcium, 3) the present results together with those in the previous work indicated the possibility of the refining of ferritic stainless steel with very low levels of carbon, nitrogen and sulphur by hydrogenargon plasma jet using CaC2-CaF2 or CaO-CaF2 flux.
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