1. What is black steel pipe?
Black steel pipe or black metal pipe is a type of carbon steel pipe. Its surface has not been treated in any way. The black color comes from the oxide layer formed by long-term contact between the steel pipe and the air. This oxide layer is mainly composed of iron oxide (Fe₂O₃) and ferric oxide (Fe₃O₄), and is black. The oxide layer has a protective effect and can prevent further rust and corrosion of steel pipes. But in a humid environment, this oxide layer is easily damaged or damaged.In order to be beautiful and durable, some black steel pipe manufacturers will use epoxy resin to surface treat the steel pipe to form powder coated steel pipe.
2. Advantages and disadvantages of black steel pipe
(1) Pros of black steel pipe
① Widely usedAs a commonly used metal pipe, black steel pipe is widely used in various industries. It can be used in home decoration and air compression systems. Compared with galvanized pipe, it is more suitable for high temperature and high pressure environments. This material is often used in fire sprinkler systems and gas pipelines. If it needs to be used in a water supply system, it needs to be made of high-quality carbon steel that meets ASTM A53 or API 5L standards and be rust-proofed.
②Strength and durability
The carbon content of black steel pipe is between 0.25% and 0.55%, and an appropriate amount of manganese is added. Hot rolling or cold rolling, annealing and other production processes make it have high hardness and strength and can adapt to high temperature and high pressure environments. , suitable for industries such as construction, manufacturing, oil and gas.
③Economical and affordable
The raw material carbon steel for black steel pipes is rich in resources and the production steps are simple, so the price is relatively low and suitable for various applications.
④Fire resistance
The high melting point gives black steel pipe good fire resistance, which makes it one of the popular options for fire protection pipes. This feature is especially important for buildings and facilities that require enhanced safety measures.
⑤Easy to install
Carbon steel makes black steel pipes malleable and can be bent, cut and processed according to the actual needs of the project. With this feature, black steel pipes are often used as pipe supports and frames. There are many ways to connect black steel pipes, such as welding, flange connection, and threaded connection. When installing steel pipes, pay attention to check whether there are dents, bends and other quality problems in the pipes to ensure that the welds are firm.
(2) Cons of black steel pipes
①Easily corrodedAlthough the oxide layer on the surface of black steel pipes can prevent corrosion, it is particularly susceptible to corrosion if it is exposed to moisture or corrosive chemicals, putting water and gas pipelines at risk of leakage and contamination. Therefore, black steel pipes must be regularly maintained and anti-corrosion measures taken during use.
②Weight
Black steel pipes tend to be heavier than other materials such as PVC or aluminum, which makes handling and installation time-consuming and laborious. Due to the excessive weight, black steel pipes also need to pay additional support costs.
③Rough inner surface
During the forming process of black steel pipes, the steel pipe blanks will go through processes such as perforation and rolling. These processes will produce a certain roughness on the inner surface of the steel pipe. This will reduce the flow rate of gas or liquid in the pipeline and increase energy consumption and costs. At the same time, this also makes it easy for sediments to form in the pipeline, causing blockage.
