Cast iron manhole covers are mainly made of cast iron. The quality of such manhole covers is related to the problem of nodularity. The commonly used coating for processing castings is rust-proof asphalt paint. Of course, the surface of cast iron manhole covers is also spray-treated with rust-proof asphalt paint. An advantage of the Xushui cast iron manhole cover is that the cast manhole cover is 30% lighter than the same type of gray cast iron manhole cover due to the high strength and good toughness of the cast iron.
Features of cast iron manhole cover:
Good toughness. The impact value is detailed with medium carbon steel, which is more than 10 times that of gray iron material.
Strong corrosion resistance. In the water spray corrosion test, the amount of corrosion in the 90-day period is only 1/40 of the steel pipe, which is 1/10 of the gray iron pipe. The service life is 2 times that of gray iron pipes and 5 times that of ordinary steel pipes.
Good plasticity. The elongation is ≥7%, which is similar to that of high-carbon steel, while the elongation of gray iron materials is zero.
high strength. Tensile strength ób≥420MPa, yield strength ós≥300MPa, which is the same as low-carbon steel, and is three times that of gray iron material.
The strength of cast iron is comparable to that of cast steel. Cast iron has a higher yield strength, with a minimum yield strength of 40k, while the yield strength of cast steel is only 36k. In most municipal applications, such as: water, salt water, steam, etc., the corrosion resistance and oxidation resistance of cast iron exceed that of cast steel. The main applications are: municipal roads, highways, communications, electricity, water, communities, schools, etc Various parks.
Good anti-theft and security performance:
The tensile strength and pressure resistance of Xushui cast iron manhole cover are similar to steel, so it is also known as cast steel. Compared with the traditional gray cast iron, its elongation is greatly improved, it has good toughness, it is not easy to break, it has better anti-theft performance than ordinary cast iron manhole covers, and its overall performance is much better than ordinary cast iron manhole covers.
Due to the patented structure that prevents noise, there is no sound when the manhole cover is passing, and it no longer disturbs the people.
Needless to say, compared with other manhole covers, the quality of cast iron manhole covers far exceeds that.