The pure iron has a great affinity for carbon i.e., iron readily reacts with carbon and forms physical properties of carbon alloy. Carbon has a profound influence in physical properties of this alloy and it's effect on the nature and properties of the metal is controlled by the metallurgist.
It is metallurgist's job to control the composition to get the required physical properties of iron-carbon alloy.
It may be any kind of ferrous alloy, i.e., Iron Casting or Steel Casting.
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