Ductile Iron pipe fittings are magnesium or rare earth magnesium combined with gold pellets before pouring into molten iron, so that graphite ball, stress concentration reduced, so that the pipe has a large strength, high elongation, impact resistance, corrosion resistance, good sealing properties.
The effect of spherical graphite on metal matrix is smaller than that of flake graphite, so that the strength of cast iron reaches the $number of Matrix microstructure, the tensile strength can reach 120ke, and has good toughness. Ductile Iron Pipe Ductile iron in addition to iron outside the chemical composition is usually: carbon content 3.6, Silicon Content 2.0, containing manganese, phosphorus, sulphur total of not more than 1.5% and the appropriate amount of rare earth, magnesium and other spherical chemicals.
Ductile Iron Pipe Ductile iron is a carbon content of more than 2% of the Fe-C alloy, industrial pig iron carbon content in general 2.5%-4%, and contains C, Si, MN, S, p and other elements, is the iron ore stone blast furnace smelting products. According to the different forms of carbon in pig iron, it can be divided into steelmaking pig iron, cast iron and ductile iron and so on. Ductile iron is a kind of high-strength cast iron material developed in the the 1950s, its comprehensive performance is close to steel, it is based on its excellent performance, has been successfully used to cast some of the force complex, strength, toughness, wear-resistant parts of higher requirements. Ductile Iron pipe Ductile iron has rapidly developed into a very extensive cast iron material after Gray iron. The so-called "iron substituting steel", mainly refers to ductile iron.