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It's a non-metal. Graphite is a polymorph of the element carbon. diamond is another polymorph. The two share the same chemistry, carbon, but have very different structures and very different properties. Diamond is the hardest mineral known to man, Graphite is one of the softest.
In spherical form, the graphite exerts a minor influence on the properties of the steellike matrix because in that form the graphite-to-metal contact area is at a minimum. It is relatively economical to produce and finds application in many industries. Ductile iron is similar to other high-carbon, high-silicon alloy with respect to corrosion resistance, sliding wear, and machinability except insofar as the shape of the graphite alters these characteristics.