DUCTILE IRON PIPES
Ductile Iron Pipes Tubemakers Yennora
Ductile Iron is a cast iron in which graphite is present as round “balls” or spheroids – hence, the alternative name of spheroidal graphite cast iron. It is more “steel-like” with its mechanical properties, exhibiting some degree of ductility and toughness.
The pipe is also manufactured by pouring cast iron into water-cooled steel mould, producing a white cast iron, which requires further annealing. Large diameter pipes can be produced using sand moulds.
The pipes are invariably thinner than grey cast iron pipes, spun factory-lined, and protected with a range of external coatings, depending upon which standard they were manufactured to.
Ductile Iron Microstructure
Simulated spheroid of graphite under stress
First Commercial Ductile Iron production