In the modern manufacturing principle of ductile iron manhole covers, we can forge ductile iron through cast steel and forged steel, which is widely used in the mechanical manufacturing industry today. In fact, the principle of ductile iron is to obtain graphite with the same shape as the ball through the process of spheroidization, which effectively improves the performance of cast iron, especially its plasticity and toughness, resulting in higher quality than carbon steel. However, in order to reduce costs, ductile iron manhole covers are generally forged using cast and forged steel.
Ductile iron is a brittle material. Firstly, cast iron means a carbon content greater than 2.1% (with a carbon content of 3.50-3.90% and a metallographic structure of ferrite+pearlite). If the carbon content is high, its hardness will definitely be high. Secondly, spheroidizing the ductile iron means that the size of the metal particles decreases, which will also improve the strength and hardness of the material. So generally speaking, the hardness of ductile iron is very high (definitely higher than that of ordinary steel).
Firstly, heavy vehicles are usually used in road traffic, so ductile iron manhole covers are generally chosen, which have a bearing capacity of about 40 tons; Some composite manhole covers can also achieve a bearing capacity of around 25 tons, which is relatively cheaper than ductile iron. However, ductile iron manhole covers are relatively safe.
Secondly, compared to composite manhole covers, ductile iron manhole covers are more likely to be targeted by thieves. Ductile iron manhole covers not only have good load-bearing capacity, but also focus on the design of every detail of ductile iron manhole covers, especially in terms of anti-theft performance, truly forcing thieves to the point where they have no way to start and no one can steal. Some people may worry that cast iron manhole covers may make a loud noise when driving over, which is somewhat unnecessary because we have already considered this issue in our design. Each manhole cover has undergone noise reduction treatment before leaving the factory, completely isolating the noise pollution problem of ductile iron manhole covers.
Finally, the load-bearing capacity of composite manhole covers is much smaller than that of ductile iron manhole covers. For places like green belts and sidewalks that do not require significant pressure, the cost of using composite manhole covers is much lower than that of using ductile iron manhole covers.
Post time: Aug-10-2023
