Ductile iron manhole covers are generally divided into round and square shapes. In urban road administration, round shapes are generally used because round manhole covers are not easy to tilt and can better protect the safety of pedestrians and vehicles. The use of round shapes is mainly due to the fact that the length of each diameter of the round manhole cover passing through its center is the same. In this way, if the manhole cover is rolled up by a passing vehicle, no matter how it is rolled up, its diameter will be slightly wider than the wellhead below, and the manhole cover will not fall into the wellhead.
Manhole Cover and Grating |
EN124:1994 |
Material:GGG500-7Class |
Class |
Application |
Dimension(Frame mm) |
A15 |
Pedestrians,Pedal Cyclists |
Dia760 |
B125 |
Footways,Pedestrians,Car |
290*290,dia800.… |
C250 |
Kerbside channel of roads |
700*700,600*800.. |
D400 |
Road,hard shoulders etc. |
850*850,920*920.… |
E600 |
Docks,aircraft pavements etc. |
as per your demands |
F900 |
Aircraft pavements etc. |
as per your demands |
Characteristics of ductile iron manhole covers:
1. Good toughness. The impact value is similar to that of medium carbon steel and more than 10 times that of gray iron.
2. Strong corrosion resistance. In the water spray corrosion test, the corrosion amount in 90 days is only 1/40 of that of steel pipes and 1/10 of that of gray iron pipes. The service life is twice that of gray iron pipes and 5 times that of ordinary steel pipes.
3. Good plasticity. The elongation is ≥7%, which is similar to that of high carbon steel, while the elongation of gray iron is zero.
4. High strength. The tensile strength ób ≥ 420MPa and the yield strength ós ≥ 300MPa are the same as those of low carbon steel and three times that of gray iron.
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