In 1947, British H. Morrogh discovered that when cerium is added to hypereutectic gray cast iron, the graphite is spherical when the content is above 0.02wt%. In 1948, the American A. P. Ganganebin et al. pointed out that adding magnesium to cast iron followed by inoculation with ferrosilicon, when the residual magnesium content is greater than 0.04wt%, spheroidal graphite is obtained. Since then, nodular cast iron has begun large-scale industrial production. The history of the use of cast 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.
Current Status and Prospects of Ductile Iron Pipes in my country
The industry of ductile iron pipes in my country started in the early 1990s. With the strong support of the China Urban Water Supply Association, it has developed rapidly. After nearly 30 years of practical use, its safety and practicality have been generally recognized by the water supply industry. In 2008, the domestic The annual output has reached 2.2 million tons, 11 times that of 1990. Since our country is a country lacking water resources, there are more than 600 water-deficient cities and more than 200 severely water-deficient cities. Water supply and water conservation are in the ascendant, and ductile iron pipes have broad prospects for development.
