The difference between black steel pipe and galvanized steel pipe

Black pipe and galvanized steel pipe are the two most commonly used pipes for transporting liquids and gases. They have a few similarities, many confuse one with another. What is the main difference between black and galvanized steel? Black steel pipe and galvanized pipe is made of steel, but galvanized pipe with zinc coating, and black pipe is not galvanized, galvanized pipe is more expensive and more durable. In transportation, black steel pipe is more corrosive than galvanized pipe, so it is more suitable for conveying gas, while galvanized pipe is more suitable for conveying water than gas.


Galvanized pipe covered with a layer of zinc, making it a high anti-corrosion ability to help prevent the accumulation of pipe plugging the pipeline. Galvanized pipe is mainly used for water supply for residential and commercial buildings, can also be used as a scaffolding frame, because it has a rust-proof effect. Black steel pipe is seamless manufacturing, is a better gas pipeline. It can be used in fire sprinkler systems because it is more fireproof than galvanized pipes. Because iron oxide has a dark colored surface during the manufacturing process, it is called a black steel tube. The main difference between steel pipe and galvanized pipe is the surface. Black steel tubes are uncoated and steam-free, so they are widely used to transport gases such as propane and natural gas for use in residential and commercial buildings.


Zinc and other minerals on the surface of the galvanized pipe will Flack over time and clog the pipe. This will result in a burst. In view of this, it is dangerous to transport the gas with a galvanized pipe, so it is often used to convey water. On the other hand, black steel pipe is not suitable for water transport. Black steel pipe easily corroded in the water, the pipeline of minerals will dissolve into the water, blocking the pipeline.


In general, black pipe is cheaper than galvanized pipe. This is due to the zinc coating of the galvanized pipe and the manufacturing process. Black steel maintenance costs low, parts low cost. Black tubes and galvanized tubes look similar to many people. So how to distinguish between the two tubes it? There are three main ways here. First, you can check the color of the pipe. Black steel pipe than the galvanized pipe is flat black, galvanized pipe is silver gray. Second, galvanized pipes are commonly used for water delivery and black gas delivery pipes, which you can differentiate based on the material they carry. Finally, you can see from the year of using the pipeline. Black pipe is used late than galvanized pipe. If the pipe was installed after 1950, it is likely to be black steel.