Ductile Iron, also known as Spheroidal Graphite (SG) iron or nodular iron is made by treating liquid iron of suitable composition with pure magnesium before casting. This promotes the participation of graphite in the form of discrete nodules instead of interconnected flakes. The nodular iron so formed has high ductility, allowing casting to be used for pipe making.
The hot metal tapped from induction furnace is transferred into the turning ladle. Pure magnesium is then charged into the reaction chamber through a charging mouth. The hydraulic system provided will tilt the turning table into vertical position, thus allowing molten iron to react with Magnesium. The reaction is allowed for 10 minutes. Once the reaction is complete, the hot metal is transferred to the pouring machine for casting the Ductile Iron Pipes.