Abstract
Experimental results on the melting procedure of cast iron by the use of heavy oil fired rotary furnace of 3 ton capacity have been summarized in this report. Experiments were made on the method of composition control, variation of chemical compositions during melting, variation of iron temperature with time elapsed and also on the quality and castability of iron obtained. Experimental results were in brief as follows: 1) The carburization method by adding electrode scrap combined with 15 percent water-glass to half melted mushy iron was superior to other methods. 2) Yields of silicon and manganese were better when they were added to iron at around 1,400°C than in case of adding them with original charging materials. 3) Oxidation losses of carbon and silicon were large until iron temperature reached 1,400°C, while at temperatures higher than this, the reduction of both elements ceased and they became stable. 4) Charged metals melted down in about 80 minutes after firing the burner and reached 1,470 to 1,500°C in 70 to 80 minutes thereafter. Those melting periods increased somewhat when furnace wall became thin after the many times of use or when slag volume was large. 5) The mechanical properties of test castings were almost the same or rather better than those of cupola melting. The castability was good when the charging ratio of pig iron was high, but it was the same to that of cupola iron when the charging ratio of pig iron was only 10 percent.
