Characteristics of ductile iron manhole covers

Ductile iron manhole cover is a type of ductile iron product. Ductile iron obtains spherical graphite through nodularization and inoculation treatment, which effectively improves the mechanical properties of the cast iron, especially the plasticity and toughness, thereby obtaining higher strength than carbon steel. Ductile iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. Based on its excellent performance, it has been successfully used to cast some complex stress-bearing materials with strength, toughness, and wear resistance. Parts with higher performance requirements. Ductile iron has rapidly developed into a widely used cast iron material second only to gray cast iron.
Ductile iron manhole covers are generally divided into round and square. In terms of road administration in urban areas, round manhole covers are generally used because round manhole covers are not easy to tilt and can better protect the safety of pedestrians and vehicles. The main reason for using a circular manhole cover is that each diameter length through its center of the circle is the same, so that if the manhole cover is rolled up by a passing vehicle, its diameter will be slightly smaller than the wellhead below no matter how it is rolled up. Wide, the manhole cover will not fall into the wellhead.