Do you know the features of the ductile iron shaft cover?
The cover of the Guiyang cast iron shaft is mainly made of spheroidal graphite cast iron。 The quality of this kind of well cover involves the problem of the rate of spheroidization。 The commonly used coatings for castings are anticorrosive asphalt lacquer。 Of course, the surface of the Guiyang cast iron well cover is also treated by spraying antirust bitumen paint。 The advantage of Guiyang cast iron manhole is that the cast iron covers of Guiyang are lighter than the same type gray iron covers by 30% because of the high strength and toughness of Guiyang cast iron。
The features of Guiyang cast iron shaft cover:
Good toughness。 The impact of value and medium carbon steel in detail, is more than 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 plasticity is good。 The elongation rate is more than 7%, similar to high carbon steel, and iron material extension rate is zero。
The strength is high. The tensile strength, yield strength, B = 420MPa, s = 300MPa, with the same low carbon steel, is three times the iron material.
Because of the microstructure of the spheroidal graphite of Guiyang cast iron, the Guiyang cast iron is better than the cast steel in reducing the vibration capacity, so it is more beneficial to reduce the stress. One of the important reasons for the selection of Guiyang cast iron is that the cost of Guiyang cast iron is lower than the cost of cast steel. The low cost of Guiyang cast iron makes this material more popular, higher casting efficiency, and less machining cost of ductile iron.
The strength of the cast iron in Guiyang is comparable to the strength of the cast steel。 The yield strength of Guiyang cast iron is higher, the yield strength is lowest 40K, and the yield strength of cast steel is only 36K。 In most of the municipal applications, such as water, brine, steam, and so on, the corrosion resistance and oxidation resistance of Guiyang cast iron exceed the cast steel。