A NOVEL METHOD FOR THE OXYGEN ACTIVITY MEASUREMENT APPLIED IN CONTROL OF THE DUCTILE IRON MANUFACTURING PROCESS

The objective of the present study was to evaluate a method for the measurement of oxygen activity in liquid cast iron to predict the cast iron properties after solidification. A series of experimental melts were made, testing the activity of oxygen after melting down of the charge, treatment with varying amounts of magnesium alloys, and during prolonged holding of the melt in a crucible furnace. The basic chemical composition of cast iron, the graphite form, and in some cases, the total gas content (O, N, H) as well as the strength and elongation were determined. The influence of oxygen activity on the morphology of graphite was stated and, provided certain technical and organisational conditions are met, the usefulness
of this method in control of the ductile iron manufacturing process was confirmed.

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