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MATERIAL DUCTILE CAST IRON

As known as ductile cast iron, nodular cast iron, and spheroidal graphite iron
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Suitable for premium quality manhole cover

Ductile iron has spheroidal graphite, which is different from flake shaped graphite found in grey iron. This spheroidal graphite is accomplished by adding an inoculant; magnesium, to molten iron.

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Suitable for premium quality manhole cover

Ductile iron has spheroidal graphite, which is different from flake shaped graphite found in grey iron. This spheroidal graphite is accomplished by adding an inoculant; magnesium, to molten iron.

Tougher and lighter the strong successor of Grey iron

Ductile iron manhole cover has 3 big advantages over grey iron cover.

  • Higher strength, but still lighter; Ductile Iron has approximately twice the strength of Cast Iron as determined by tensile, beam, ring bending, and bursting tests.
  • Follows the industry’s most strict and up-to-date standards; The standards for ductile iron require higher performance.
  • Less likely to break; spheroidal form results in enhanced ductility, which prevents the breakage when overloaded.
load table

LOAD CLASSIFICATION ACCORDING TO EN124

The appropriate class of manhole top or gully top to be used depends upon the place of installation.
load
Group
Group 1 (Min. class A15)

Areas which can only be used by pedestrians and pedal cyclists.

Group
Group 2 (Min. class B125)

Footways, pedestrian areas and comparable areas, car parks or car parking decks.

Group
Group 3 (Min. class C250)

For gully tops installed in the area of kerbside channels of roads.

Group
Group 4 (Min. class D400)

Carriageways of roads (including pedestrian streets), hard shoulders and parking areas, for all types of road vehicles.

Group
Group 5 (Min. class E600)

Areas imposing high wheel loads, e.g. docks, aircraft pavements

Group
Group 6 (Min. class F900)

Areas imposing particularly high wheel loads

e.g. aircraft pavements.