純酸素ガス上吹きによる溶融ステンレス鋼の真空脱炭速度について

概要

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Penetration depth of gas into liquid has been investigated for top-blown lance under reduced pressure. Both theoretical and experimental results show that the depth increases with decrease of pressure, so that a reaction between gas and metal bath is expected to be accelerated by decreasing pressure in gas phase. Decarburization rate has been investigated for 20kg H.F. furnace with top-blown oxygen gas. The rate in the high carbon range is independent on carbon content, but increases with gas flow rate. The activation energy for decarburization rate is determined as 10.9±4.6kcal/mol at 10 Torr with 1.8 Nl O_2/min, which is independent on chromium content from 8 to 17%. The rate controlling step is concluded to be in gas boundary layer. Decarburization rate in low carbon range obeys first order reaction of carbon content, and the activation energy is determined as 10.1 and 47.0kcal/mol at 10 and 50 Torr, respectively. The former is explained through carbon diffusion in the bath, but the latter is not explained without considering oxide effect on the bath surface.
社団法人日本鉄鋼協会の論文
1973-10-01