What are the characteristics of manhole covers made of different materials used on roads?

Cast iron manhole cover has high strength, high hardness, difficult corrosion, strong impact resistance and high bearing grade. Cast iron manhole covers, such as Zhenjin manhole covers in Hunan, have many sizes and can be used in overloaded vehicles. Moreover, cast iron manhole covers are mostly used in municipal roads, with good safety performance and wide installation area.

Composite manhole cover, made of resin and composite materials, has no recycling value and good automatic anti-theft performance. The bending strength and compressive toughness of composite manhole cover are good, but the bearing capacity is not as high as that of cast iron manhole cover.

Stainless steel manhole cover, bright and beautiful, is generally used in parks or shopping malls, but its bearing capacity is not strong enough.