Hidden in the urban fabric: The "invisible guardians" of graphite cast iron pipes - a popular science article

Behind the transportation of tap water, rainwater drainage, and industrial fluid transportation, there is an indispensable "urban blood vessel" — graphite cast iron pipes. Based on cast iron as the base material, it makes the internal graphite present flake or spherical shape through special processes, and is divided into two types: gray cast iron pipes and ductile iron pipes. Gray cast iron pipes have high cost performance and are suitable for municipal drainage; ductile iron pipes have better performance, combining the corrosion resistance of iron and the toughness of steel.

With the advantages of durability, high strength, easy installation and environmental protection, graphite cast iron pipes have become the first choice for cities. It is corrosion-resistant and has a long service life, and the service life of ductile iron pipes can reach 50-70 years; it has high strength and is suitable for various scenarios from household use to industry; the socket connection does not require welding, the maintenance cost is low, and it is recyclable, which conforms to the concept of green development.

It is widely used in municipal water supply and drainage, industrial fluid transportation, building fire protection and other fields, silently guarding the operation of the city. In short, although this "invisible guardian" is not conspicuous, it undertakes the important needs of our daily life and industrial production.