Characteristics of the new ductile iron manhole cover

The strength and corrosion resistance of ductile iron are superior to traditional gray cast iron. The new ductile iron manhole coveris made of QT500-7 as cast ductile iron, which has the advantages of lightweight, high strength, corrosion resistance, fatigue resistance, and affordable cost. Compared with traditional gray Cast Iron Manhole covers, its weight has been reduced by 40% to 50%, while its strength has been increased by 40% to 50%. In addition, the old gray cast iron manhole covers have high brittleness and are prone to fracture, while the new ductile iron manhole covers effectively avoid this problem.

When repairing or raising the road surface, the manhole cover may be lower than the road surface and needs to be adjusted to keep it level with the road surface. The traditional approach is to excavate the entire manhole cover base, which is not only time-consuming but also laborious. The new ductile iron anti-theft manhole cover adopts a stacked outer frame design, which makes it easy to keep the manhole cover level with the road surface, saving time and effort.

Old style gray cast iron manhole covers are often the target of thieves due to their high composition of cast iron and high value for recycling. New materials reduce the recycling value of manhole covers and decrease the possibility of theft. The new type of ductile iron anti-theft manhole cover is relatively low in value for recycling and processing due to the synthesis of multiple materials and the high content of impurities, which to some extent reduces the risk of theft.

The new type of ductile iron anti-theft manhole cover is made of high-quality materials from designated production plants, including ductile iron pig iron, coke, and specialized spheroidizing agents. After fine processing, its appearance is highly similar to the asphalt surface layer. The appearance of the new manhole cover is closer to the asphalt surface layer, improving the urban aesthetics. Compared with the old gray cast iron manhole cover, it greatly improves the overall aesthetics of the road surface.