Abstract
We checked a controlling procedure of amount of oxygen in molten steel for making Cr-Mo low alloyed steels (SCM22, SCM3) by a 2 tons basic electric arc furnace with silicon semikilling during the reducing period.(1) After checking the relation between Si and O in the reducing period it was found that the correlation between Si of 0.01∼0.10% and O of 300∼100 ppm could likely be used effectively for oxygen control.(2) Furthermore, we recognized that (FeO) in slag influenced much upon the correlation between Si and O and if (FeO) was high, O raised up even under the same Si level.(3) Judging from the above mentioned results it is necessary to maintain (FeO) as the corresponding value in order to fix O.(4) In the actual trials for controlling of O by the above mentioned procedure with visual judgement of (FeO) in slag it was recognized that the probability of O expected to get itself within ±30ppm of the aimed was 80% in case of aiming at O of 100∼230ppm.
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