Ferrous Materials and Non-Ferrous Metals and Alloys 1 introduction

2.5.4 Nodular Cast Iron

It is also known as “spheroidal graphite iron” or Ductile iron or High strength “Cast

iron”. This nodular cast iron is obtained by adding magnesium to the molten cast iron.

The magnesium converts the graphite of cast iron from flake to spheroidal or nodular

form. In this manner, the mechanical properties are considerably improved. The strength

increases, yield point improves and brittleness is reduced. Such castings can even replace

steel components.

Outstanding characteristics of nodular cast iron are high fluidity which allows the

castings of intricate shape. This cast iron is widely used in castings where density as well

as pressure tightness is a highly desirable quality. The applications include hydraulic

cylinders, valves, pipes and pipe fittings, cylinder head for compressors, diesel engines,

etc.