<div class="section abstract"><div class="htmlview paragraph">NODULAR cast iron, so called because the graphite is present as finely dispersed, well-rounded particles, is made in two stages:</div><div class="htmlview paragraph">The first stage consists of the addition of magnesium or other carbide formers, which promote the formation of white iron in one normally solidifying gray. In the second stage a ferrosilicon type of inoculant overcomes the tendency toward white iron and causes the graphite to precipitate out in the form of small spherulites.</div><div class="htmlview paragraph">The methods of making nodular iron, the effect of composition on physical properties, economic factors involved, and potential applications are discussed in this paper.</div></div>