GRAY IRON
Gray iron casting contains graphite in the form of elongated flakes of varying size and shapes. Gray iron casting requires adding more carbon to the molten iron than is necessary for the production of steel. Most forms of steel contain less than 1.2% of carbon whereas gray iron usually contains from 2.5% to 4%. Adding carbon to the iron decreases the fusion point of the metal and makes it more fluid. This makes it easier to get the metal to conform to intricate shapes