Ductile iron pipe is mainly called a centrifugal ductile iron pipe. 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. It is the first choice for water supply pipes and has a high-cost performance. 

Ductile iron pipe is mainly called centrifugal ductile iron pipe, which has the essence of iron and the performance of steel, excellent anti-corrosion properties, good ductility, good sealing effect, easy to install, and is mainly used for municipal, industrial, and mining enterprises for water supply, gas and oil pipeline, etc.

Cast Iron Pipe, a pipe made of cast iron. Cast iron pipes are used for water supply, drainage, and gas pipelines, and include straight cast iron pipes and pipe fittings. The labor intensity is small. According to different casting methods, it is divided into continuous cast iron pipe and centrifugal cast iron pipe. 

In terms of professional knowledge, the general nodular cast iron in the national standard is represented by QT400-15, QT400-18, etc. Where QT is the abbreviation of the first capital letter of ductile iron, 400 refers to the tensile strength of the part, 15. 18 refers to elongation. There are many ways to express nodular cast iron abroad, such as EN-GJS-400-15/18 in the European standard and GGG40/GGG40.3/GGG50 in the German standard.

The finished ductile iron pipes are transported to the construction site and inspected in accordance with the standards.