What Is Ductile Iron Pipe?
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In 1947, British H. Morrogh discovered that when cerium was added to hypereutectic gray cast iron, the graphite was spherical when the content was over 0.02wt%. In 1948, A. P.Ganganebin and others in the United States pointed out that adding magnesium to cast iron and then inoculating with ferrosilicon, when the residual magnesium content is greater than 0.04wt%, spherical graphite is obtained. Since then, nodular cast iron has begun large-scale industrial production. The history of the use of ductile iron pipes can be traced back to the 21.14km water pipeline from the outskirts of Paris from the Seine to Versailles in 1668. 300 years have passed. Except for the repair and replacement of some pipes and joints, the main body is still in use today.
China’s ductile cast iron pipe industry started in the early 1990s and developed rapidly under the strong support of China Town Water Supply Association. After nearly 20 years of practical use, its safety and practicality have been generally recognized by the water supply industry. The annual output has reached 2.2 million tons, 11 times that of 1990. As China is a water-scarce country, China’s urban water supply capacity is obviously insufficient at present, and some cities suffer from severe water shortages. Among the 668 cities in the country, there are more than 300 water-deficient cities, accounting for 46%; more than 140 cities are severely water-deficient , Accounting for 21%, water supply and water saving business is in the ascendant, ductile iron pipes have broad development prospects.
Ductile iron pipe is a kind of cast iron, an alloy of iron, carbon and silicon. Graphite in ductile cast iron is in the form of spheroids. Generally, the size of graphite is 6-7. The quality requires that the spheroidization level of the cast pipe be controlled to be 1-3 (spheroidization rate ≥80%), so the material itself is mechanical The performance has been better improved, with the essence of iron and the performance of steel. The annealed ductile iron pipe has a metallographic structure of ferrite plus a small amount of pearlite, which has better mechanical properties. Ductile iron pipes are mainly called centrifugal ductile iron pipes. It has the essence of iron, the properties of steel, excellent anti-corrosion performance, good ductility, good sealing effect, easy installation, and is mainly used for water supply, gas transmission, and transportation of municipal, industrial and mining enterprises. Oil etc. It is the first choice for water supply pipes and has a high cost performance. Compared with PE pipes, ductile ink pipes are easier and faster to install than PE pipes in terms of installation time, and have better internal and external pressure after installation; from the perspective of airtightness and corrosion resistance, ductile ink tubes have better airtightness after installation, and A variety of anti-corrosion methods can be used to improve the anti-corrosion performance; from the perspective of hydraulic performance, because the specifications of ductile pipes generally refer to the inner diameter, the specifications of PE pipes generally refer to the outer diameter. From the perspective of comprehensive installation and maintenance cost, the ductile tube has a more superior cost performance. The inner wall is sprayed with zinc, cement mortar and anticorrosive materials.
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