China Ductile Iron Manhole Cover 500*500

about ductile iron (Nodular iron)

Ductile iron, or nodular iron, obtains its special properties through the addition of magnesium into the alloy. The presence of magnesium causes the graphite to form in a spheroid shape as opposed to the flakes of gray iron. Composition control is very important in the manufacturing process. Small amounts of impurities such as sulfur and oxygen react with the magnesium, affecting the shape of the graphite molecules. Different grades of ductile iron are formed by manipulating the microcrystalline structure around the graphite spheroid. This is achieved through the casting process, or through heat treatment, as a downstream processing step.

Product feature

Name

Ductile manhole cover

Material

Ductile iron GGG50/7, gray iron

Standard

EN124/1433/1563

Class

A15,B125,C250,D400,E600,F900

Shape

Round, square, rectangle

Size

200mm-1200mm or as per customers'drawing

Surface

Bituminous black

Molding

DISA Line, Hand Modelling

Process

Drawing-mould making-rawcasting-sand blasting-rough machining-surface treatment-product inspection

Advanced technology and equipments

Tensile strength: 500Mpa Yield stress: 320Mpa
Elongation rate: 7%
Hardness: HBS170-230

Load capacity

B125 C250 D400 E600 F900

Tolerance

Machining:+/-0.2mm, finishmachining:0.2mm

Application

Footway, car parks, main road, aircraftpavements

Advantage

Longevity corrosion resistance,excellent anti-pressure