Chengdu Xinfu Shengyuan Building Materials Co., Ltd.XINFU SHENGYUAN BUILDING MATERIALS

Chengdu ductile iron manhole covers are made of ductile iron. The quality of such covers is related to the spheroidization rate. The common coating for castings is anti-rust asphalt paint, and the surface of ductile iron manhole covers is also treated with sprayed anti-rust asphalt paint. One advantage is that due to the high strength and good toughness of ductile iron, they are about 30% lighter than gray cast iron covers of the same type.

The characteristics of ductile iron manhole covers: good toughness, strong corrosion resistance, good plasticity and high strength. Due to the spherical graphite microstructure of ductile iron, in terms of vibration damping ability, ductile iron is superior to cast steel, which is more conducive to reducing stress. An important reason for choosing ductile iron is that it costs less than cast steel. The low cost makes this material more popular, with higher casting efficiency and reduced machining cost.

The strength of ductile iron is comparable to cast steel. Ductile iron has a higher yield strength (40k), while cast steel has a yield strength of only 36k. In most municipal applications, such as water, saltwater and steam, ductile iron has better corrosion resistance and oxidation resistance than cast steel.

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