Na_2CO_3 により事前精錬した溶銑の上吹き転炉での脱炭試験

概要

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Decarburization of desiliconized, dephosphorized and desulphurized (pre-refined) hot metal was studied. The pre-refined hot metal (45T) was charged in LD converter (75T/heat) and oxidized with top blown oxygen. Since [P] and [S] contents of hot metal had been reduced to the specified concentration range for those elements, the flux (lime) was not used. The amount of slag formed at the turn down was less than 5 kg/t.s and the thickness of slag on the steel bath was estimated to be 5mm. The metallurgical characteristics of decarburization without the use of flux were summarized as follows. 1) High efficiency (97%) of oxygen used for the oxidation of elements (C, Si, Fe, etc) was kept throughout the whole blowing period even in the production of low carbon steel. 2) Very low concentrations of [N] and [H] at turn down were obtained (less than 10 and 2 ppm, respectively). 3) Iron yield of heat was improved by 0.37%. 4) The amount of dust evolved during the blowing was the same as that of the ordinary heats. The iron content of the dust was 10% higher than that of the ordinary heats. 5) Bath temperature was raised at the rate of 120℃/[%C] during the decarburization.
社団法人日本鉄鋼協会の論文
1983-04-01