DUCTILE IRON PIPES

1976

 

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

1949

 

First Commercial Ductile Iron production

CI

MS

AC

GRP

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