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The Difference Between Galvanized Steel Pipe and Black Steel Pipe

Date:2020-07-02    keywords:galvanized steel pipe,black pipe

Black steel pipe is uncoated steel, also known as black steel. The dark color comes from the iron oxide formed on its surface during the manufacturing process. When a steel pipe is forged, a black oxide scale is formed on its surface, giving it the finish seen on this type of pipe.


Galvanized steel pipes are steel covered with a layer of zinc metal. During the galvanizing process, the steel is immersed in a molten zinc bath to ensure a firm and uniform barrier coating. The galvanized pipe is covered with zinc material to make the steel pipe more resistant to corrosion.

Brief description of the differences:
· Black pipes and galvanized pipes are made of steel.
· Galvanized pipes have zinc coating, but black pipes do not
· Because it is easily corroded, black pipes are more suitable for carrying gas. On the other hand, galvanized pipes are ideal for carrying water, but not suitable for carrying gas.
· Galvanized pipes are more expensive due to galvanizing
· Galvanized pipe is more durable

Different uses:
The main purpose of black steel pipes is to transport propane or natural gas to residential and commercial buildings. The pipeline has no seams, making it a better pipeline for carrying gas. Black steel pipes are also used in fire sprinkler systems because it is more fire resistant than galvanized pipes. The main purpose of galvanized pipes is to transport water to homes and commercial buildings. Zinc can also prevent deposits that may block water pipes. Galvanized pipes are commonly used as scaffolding because of their corrosion resistance.

Disadvantages of both:
The zinc on the galvanized pipe will flake over time, blocking the pipe. Peeling can cause the pipe to burst. Using galvanized pipes to carry gas can be dangerous. On the other hand, black steel pipes are more prone to corrosion than galvanized pipes and allow minerals in the water to accumulate in them.

Cost difference:
The cost of galvanized wire pipe is higher than that of black steel pipe because the zinc coating and manufacturing process involves the production of galvanized pipe. The cost of galvanized parts is also higher than black steel parts. During the construction of residential or commercial buildings, galvanized steel pipes must never be connected to black steel pipes.

How to distinguish between these two pipelines?
1. Check the color of the pipe. The black steel pipe is flat black, and the galvanized pipe is silver gray. Black steel pipes are darker than galvanized pipes.
2. Distinguish differences by the materials they carry. Galvanized pipes are usually used for water transportation, and black steel pipes are used for gas transmission.
3. If the pipeline was installed after the 1950s, it is likely to be black steel because black steel pipes are used later than galvanized pipes.

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