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Difference between Black Irons Pipes and Galvanized Pipes?

  • Corrosion Resistance
  • Manufacturing Process
  • Appearance
  • Applications
  • Durability
  • Cost

The most popular pipes used to transmit liquids and gases are black iron pipes and galvanized pipes. Because they are both made of steel, they may look pretty similar. There is, however, a distinction between black iron pipes and galvanized pipes.

Here is a brief explanation of both the properties of black iron pipes and galvanized pipes to help you make an accurate selection. Keep reading to figure out more.

Corrosion Resistance

The fundamental distinction between black iron pipes and galvanized pipes is their corrosion resistance. A mild steel compound is used to make black iron. It contains low-grade carbon. The inclusion of carbon can improve mild steel’s corrosion resistance even further. Galvanized pipes, on the other hand, are protected by a zinc layer. Galvanization is the process of placing a layer of zinc on pipes, which gives them excellent quality of enhanced corrosion resistance. Furthermore, galvanization aids in the prevention of mineral deposits that might block pipes.

Manufacturing Process

Another key distinction between black iron pipes and galvanized pipes is the production method. Black iron pipes are made by stretching steel into seamless tubes or by pulling the edges together and welding them together.

The strip of iron in galvanized pipes is passed through hot molten zinc. The zinc is heated to temperatures ranging from 820 to 860 degrees Fahrenheit. Following the coating, it is cooled in a quench tank to eliminate any undesirable impacts from the newly formed coating on the environment.


When compared to galvanized pipes, black iron pipes are darker. The gray color was caused by the iron oxide that developed throughout the production process. Due to the galvanization process, galvanized pipes have a silvery-white appearance. When painted, the zinc coating produces a smoother, higher-quality surface.


Both types of pipes have unique properties that make them excellent for specific uses. Because black iron pipes are seamless, they are the best and safest solution for transferring natural and propane gas. Because it is more fire-resistant than the galvanized pipe, it is frequently utilized in fire sprinkler systems.

Black iron pipes are known to rust rapidly when exposed to water. This is where the utility of galvanized pipes plays a part. For over 30 years, galvanized pipes have been primarily utilized for conveying water to supply infrastructure. Because of its corrosion resistance, it may also be used in a variety of outdoor and industrial applications. Outdoor railings, scaffolding frames, fences, drainage piping, road signage, and farm irrigation are some of the uses.


While steel is already rather durable, galvanized pipes have greater strength due to the protective zinc coating. The coating takes the damage rather than the steel itself, and it rusts from the inside out. This preserves the integrity of the galvanized pipe, extending its life expectancy by up to 40 or 50 years. Furthermore, galvanized pipes are resistant to breaking and abrasion damage. On the other hand, black iron pipes are uncoated and consequently less durable. Furthermore, water corrodes this sort of pipe quite easily.


Black iron pipes are less expensive than galvanized pipes. This is due to the lack of zinc coating. Instead, black iron pipes are coated with iron oxide throughout the manufacturing process. If you’re on a small budget and durability isn’t a top priority, pick black iron pipes over galvanized pipes.


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