الفهرس 
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Abstract
Some of the common methods employed for the production of the spheroidal graphite iron are reviewed. The main factors affecting melt treatment inside the mould are discussed.
In the first part of this work a theoretical study was made based on the heat conduction principles; a mathematical equation for calculating the maximum alloy grain size was deduced.
In the second part of this study experimental investigation was carried out in which low sulfur iron melt (0.012%S, Sc = 0.995)/ was used. The pouring temperature of the iron was varied from 1320-1500c. Cast specimens in the form of plates with different weights and thicknesses were produced by means of melt treatment inside the mould. The melt temperature inside the mould cavity was measured by means of pt-pt Rh 13 thermocouple connected to a 24 channel Ultra- violet recorder.