Ca 化合物粉末を併用した H_2-Ar プラズマ・ジェットによるフェライト系ステンレス鋼 (25%Cr) の脱硫

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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%CaC_2-CaF_2, 20wt%CaO-CaF_2 and 12wt%CaC_2-(18∿35)wt%CaO-CaF_2, 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 CaC_2 in CaC_2-CaF_2 was 30∿40%, and the minimum sulphur concentrations attained were as low as 0.0007% by CaO-CaF_2 and 0.0013% by CaC_2-CaF_2, 2) hydrogen in the plasma, which reacted with CaC_2 to form hydro-carbon gases, effectively enhanced desulphurization, preventing the carburization from CaC_2, but retarded the desulphurization above P_<H_2>=0.5 atm 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 CaC_2-CaF_2 or CaO-CaF_2 flux.
1977-07-01