クロム鋳鉄のキュポラ熔解について

抄録

  It is clear that cupola control may be operated in some of the fundamental conditions based on blast volume and pressure, but fundamental knowledge indicating relationships between the combustion conditions and some of the important metallurgical reactions is required.
  The author operated the acid-lined cupola to continue the standard melting for cast iron by addition of steel scrap or all steel scrap for a considerable time to investigate the relative relations of operating conditions.
  In this paper, he reports the details of the operation of chromium cast iron melting based on the results obtained from steel scrap melting by cupola.
  The results of this experiment are summarized as follows :
  It is possible to melt the high chromium cast iron (10∼25%Cr) by the use of cupola alone when the operation is performed under the reasonable and theoretical control to govern the combustion condition which is obtained from the experimental data.
  At 1450°∼1550°C, the behaviour of chromium under the condition of cupola operation may differ from that of steel making conditon, and when the temperature is low, the better migration of chromium from molten iron takes place, and at a higher temperature this is decreased.
  Influences of temperature and FeO content of the slag for migration of chromium are clear, and as the FeO content is lower the temperature change will be more effective.
  By the addition of chromium to molten pig iron, it's carbon content will be increased, but if low carbon content iron is desired, the oxygen blowing method in the ladle may be effective for decarburization the iron without much loss of chromium.