Ductile iron manhole grate tensile strength and pressure resistance of steel and similar, so also known as cast steel. Compared with the traditional gray iron, its elongation rate is greatly improved, it has good toughness, and is not easy to destroy. It has better anti-theft performance than ordinary cast iron manhole cover, and the overall performance is much better than that of common cast iron manhole cover.
The impact of value and medium carbon steel in detail, is 10 times the iron material, strong corrosion resistance。 In the water jet corrosion test, the corrosion amount of ninety days is only 1/40 of the steel tube and the 1/10 of the ash iron pipe。 The service life is 2 times that of the gray iron pipe and 5 times that of the ordinary steel pipe。
The strength of ductile iron is comparable to that of cast steel. Ductile iron has higher yield strength, and its yield strength is lowest 40K, while the yield strength of cast steel is only 36K.
In most municipal applications, such as water, brine and steam, the corrosion resistance and oxidation resistance of ductile iron are all higher than that of cast steel. The main application fields are municipal roads, highways, communications, electric power, tap water, residential quarters, schools and so on.
The elongation rate is more than 7%, similar to the high carbon steel and iron materials, the elongation is zero, tensile strength, yield strength, B = 420MPa, s = 300MPa, with the same low carbon steel, is three times the iron material。
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