Compared with ordinary cast iron pipes, ductile iron pipes not only retain the corrosion resistance of traditional cast iron but also offer higher strength, better toughness, thinner walls, lighter weight, improved impact resistance, superior bending performance, and easier installation.

As a result, ductile iron pipes have been widely promoted and used around the world. In many regions of China, ductile iron pipes have become the standard choice for small- and medium-diameter water supply systems.

Differences Between Ductile Iron Pipe and Ordinary Cast Iron Pipe

Ductile iron pipes possess the essence of iron and the performance of steel.

Both ductile iron pipes and ordinary cast iron pipes contain graphite. In ordinary cast iron, the graphite exists in a flake form. Since flake graphite has relatively low strength, it creates numerous weak points within the iron structure, resulting in lower strength and greater brittleness.

In ductile iron pipes, the graphite exists in a spheroidal (nodular) form. These spherical graphite nodules have a much smaller impact on the strength of the material than flake graphite. Therefore, ductile iron pipes offer significantly higher strength, better toughness, and improved durability compared with ordinary cast iron pipes.

Thanks to these advantages, ductile iron pipes have become a preferred choice for modern water supply and infrastructure projects.