China 850X850mm Square frame & Round cover ductile iron manhole cover Manufacturer

The full name of ductile iron manhole cover  is also called cast iron manhole cover. It can be said that it is a kind of cast iron manhole cover, but it is very different from traditional cast iron manhole cover.There are many defects in the traditional cast iron manhole cover from the process to the material, for example, it is not very load-bearing, each data index is not very good, But the ductile iron manhole cover is much better.

Ductile iron manhole cover =The Matrix of carbon Steel with globular graphite

The spheroidal graphite has less cleavage effect on the metal matrix than other graphite shapes, and the strength of cast iron can reach 70% of the matrix strength, and the tensile strength can reach 120 kgf / m ~ (2) mm, and it has good toughness.

China ductile iron manhoel cover

Difference between Ductile Iron manhole  cover and Gray cast Iron well cover:

1:The graphite of gray iron is flat and flaky,The graphite of ductile iron is spherical,If the sound of striking ductile iron is similar to that of striking carbon steel, the ductile iron is nodulated well.

2:About the spherification rate,It can be said that the same ductile iron products, the spheroidization rate is different, then the quality is different, the price is also very different.General factory has the ball rate of 85% qualified products.

3:In terms of smelting method, nodular iron is obtained by adding inoculant and nodular agent to gray iron during smelting, so that the graphite becomes globular from dispersed clumps, so as to reduce the cleavage of ferrite and increase the strength.

4:the gray iron manhole cover is to add no auxiliary raw materials, the pig iron directly into molten iron, and then pour into the manhole cover.However, nodular cast iron manhole covers are made by adding other metal alloys such as rare earth magnesium.Therefore, the market and relevant departments now require the use of ductile iron manhole covers that is because the ductile iron manhole covers, in the bearing capacity of far more than the gray iron manhole covers.

5:Ductile cast iron has good strength and toughness, so the ductile cast shaft cover is about 30% lighter than that of the same type of grey cast shaft.

ductile iron cover

Product features of Ductile iron manhole cover from China Manufacturer 

1. Long life: corrosion-resistant, pollution-free, maintenance-free, can be used for more than 50 years.

2. High bearing capacity: the bearing capacity is far higher than other types of products, and the bearing pressure is high.

3. Safety: the well cover is tightly combined and will not cause jumping, stitching, noise, displacement and other phenomena. It is noiseless and safe and reliable.

4. Anti-jumping cover: anti-shock rubber ring is used to make the vehicle no noise when passing. It meets the environmental requirements.

5. Anti-theft: general anti-theft design, new anti-theft design, well cover and well ring are connected with high-strength bolt, integrated design.

6. Aesthetics: beautify the urban environment, and spray black asphalt outside to make the product look bright and clean.

7. Anti-skid: there is a special anti-skid pattern on the surface of the well cover to increase friction and prevent pedestrians from slipping because of rain, snow and ice cover

Application field

Municipal roads, highways, communications, electricity, water, communities, schools and other parks.

iron manhole cover

EN124 D400 round ductile iron walkway hinged  manhole cover and frame

On the surface of ductile iron manhole covers always has unique patterns ,its main purpose is to improve friction ,so people will not slip when rain ,snow and ice  covered manhole covers .
Besides ,we can make some signs on it ,like production factory ,contact information ,subordinate unit and so on ,in some places ,they will design article manhole cover .

How to Produce ductile iron manhole cover in China ?

Product information:Manhole covers are manufactured for road construction, natural gas, water supply and drainage, telecommunications. Manhole covers and gratings should be smooth, no blisters, holes, distortion or any other defects. 

Size: 500mm*500mm,600mm*600mm,700mm*700mm,800mm*800mm, 850mm*850mmand so on.Many size can be choose,or according to customer’s drawing or requirements.

Material: Ductile Iron GGG500,or according to customers requirement

Designs:  EN124 A15, B125, C250, D400, E600 and F900 or As per customers’ drawings or samples

Processes:

1. A) Moulding boards
2. B) Green sand with hand moulding

Coating:Cold applied black bitumen Or without Coating or as per customers’ requirement

Packaging of the Ductile iron manhole cover: