What is the Difference Between Galvanized Pipe and Ductile Cast Iron?

The main difference between galvanized pipe and ductile cast iron lies in their composition, preparation, and resulting properties. Here is a comparison of the two:

Galvanized Pipe:

• Composition: Made of iron and zinc, as the iron is coated with a zinc layer.
• Preparation: Iron pipes are coated with zinc to prevent rusting.
• Properties: Galvanized pipes are resistant to rust and are more malleable than cast iron, making them easier to manufacture and customize for various applications.
• Uses: Galvanized pipes are commonly used in plumbing (both domestic and industrial) and other applications where rust resistance is desired.

Ductile Cast Iron:

• Composition: Made by adding graphite as nodular inclusions into iron.
• Preparation: Ductile cast iron is produced by adding graphite to iron, making it more flexible and elastic.
• Properties: Ductile cast iron has enhanced ductility, high impact strength, and improved resistance compared to galvanized pipes.
• Uses: Ductile cast iron pipes are employed in the transportation of potable water, sewage, slurries, and process chemicals.

In summary, galvanized pipes are made by coating iron with zinc to prevent rusting, while ductile cast iron is made by adding graphite to iron to make it more flexible and elastic. Galvanized pipes are more malleable and better suited for rust resistance, while ductile cast iron has enhanced ductility and strength, making it superior for various applications.

Comparative Table: Galvanized Pipe vs Ductile Cast Iron

Here is a table comparing the differences between galvanized pipe and ductile cast iron:

Galvanized pipes are made by coating iron or steel with zinc to provide rust resistance, while ductile cast iron is a type of cast iron made by adding graphite. Galvanized pipes are primarily used for the distribution of treated water, as they are resistant to rust and corrosion due to their zinc coating. On the other hand, ductile cast iron is used in various industries and sewage systems because of its strength and durability. It also offers a more conservative design, ease of installation, and adaptability for field changes.