ing pipe is the foremost priority for pipe material is nodular cast iron
pipe in the 20th century prime development period, material, method of pipe, interface forms continue to improve, until the middle of the 20th century, in grey cast iron material is a brittle material, graphite morphology plate shaped, easy to produce stress concentration, the sudden stress adaptation ability is poor.
Often pipeline rupture caused by leakage accidents, to meet the needs of the urban construction and meet the requirements for earthquake disaster reduction, and the casting engineering and technical personnel developed ductile iron pipes, and came out in the middle of the 20th century, due to the ductile iron pipes with approximate steel tube performance, the world's advanced countries have already entered the comprehensive use of ductile iron pipe.
Ductile iron pipe use of centrifugal casting, compact tube wall, the graphite morphology is ball, matrix is given priority to with ferrite, elongation, high strength, performance and steel tube are similar, with flexibility, adapt to the sudden force, and bending strength is greater than steel pipe, section in use process is not easy to bending deformation.
Can bear larger load, material corrosion resistance than gray iron by 35%, does not need to make anticorrosive processing, its interface is flexible interface, has the scalability and twists, adapt the foundation uneven settlement, is ideal pipe.
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