Ductile iron manhole cover is mainly made of ductile iron to create a manhole cover, the quality of this manhole cover is involved in the problem of spheroidisation rate. The common coating to deal with castings is anti-rust asphalt paint, of course, the surface of the ductile iron manhole cover is also sprayed anti-rust asphalt paint treatment. Ductile cast iron manhole cover has an advantage that is due to the high strength and good toughness of ductile cast iron, which makes the ductile cast manhole cover about 30% lighter than the same type of grey cast iron manhole cover. It is mainly used in various parks such as municipal roads, highways, communications, electric power, water supply, communities, schools and so on.