In many regions of our country, the connection between medium and small diameter ball-shaped cast iron pipes for supply lines and joints utilize socket-and-spigot or flanged connection methods; the ball-shaped cast iron must possess excellent seismic resistance and sealing properties to allow for limited bending angles.

The main components of ductile iron pipes include carbon, silicon, manganese, sulfur, phosphorus, and magnesium. Compliance with standard [span]GB/TISO2531/2003

Ductile iron pipe defined as pipes cast at high speed by centrifugal casting machine using molten pig iron with a number 18 or higher, after adding a spheroidizing agent.

Ductile Cast Iron Pipes, commonly referred to as Ductile Iron Pipes, Ductile Cast Iron Ducts, or Spheroidal Graphite Cast Iron Pipes.

Ductile iron pipes are a type of cast iron pipes. The quality requirements specify that the spheroidizing grade of the cast iron pipes should be controlled at levels 1-3 (spheroidizing rate > 80%), thus the inherent mechanical properties of the material itself.

Ductile iron pipe finished products have been significantly improved, exhibiting the essence of iron and the properties of steel. After annealing, the microstructure of the ductile iron pipes consists of ferrite with a small amount of spheroidite, offering excellent mechanical properties, corrosion resistance, good ductility, superior sealing, easy installation, and is mainly used for municipal, industrial, and mining enterprises for water supply, gas transmission, and oil transportation.

A certain number of spheroidal graphite are distributed on the ferrite and pearlite matrix. The proportion of ferrite and pearlite in the matrix varies depending on the nominal diameter and the required elongation. For small diameters, the pearlite proportion is generally not more than 20%, while for large diameters, it is usually controlled around 25%.

Folding