The cover of spheroidal graphite cast iron is mainly made of spheroidal graphite cast iron. The quality of this kind of well cover is involved in the problem of the rate of spheroidization. The commonly used coatings for castings are anticorrosive asphalt lacquer, and of course the surface of the ductile iron cover is also treated by spraying antirust bitumen lacquer. The advantage of ductile iron well covers is that the ductile cast iron cap is lighter than the same type of gray cast iron manhole cover by 30% because of its high strength and toughness.
The characteristics of ductile 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 the high carbon steel and iron materials, the elongation is zero, high strength. 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 spheroidal graphite in spheroidal graphite cast iron, the nodular cast iron is superior to the cast steel in reducing the vibration capacity, so it is more beneficial to reduce the stress. One of the important reasons for selecting ductile iron is that the ductile iron is lower than the cost of the cast steel. The low cost of ductile iron makes this material more popular, higher casting efficiency, and less machining cost of ductile iron.
The strength of the ductile iron is comparable to the strength of the cast steel. The nodular cast iron has a higher yield strength, the yield strength is lowest 40K, and the yield strength of the 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 spheroidal graphite cast iron exceed the cast steel.
Shandong spheroidal graphite cast iron well cover is full of service to customers, with high quality, reasonable price and perfect after-sale service, together with customers to develop together. Quality assurance, welcome consultation and negotiation