Characteristics and application of mild steel black pipes

Mild steel black pipes is a kind of steel pipe mainly produced by hot rolled or cold drawn steel material, and the surface is not galvanized, and the black oxide skin is retained. The following details its definition, manufacturing process, performance characteristics and main applications:

1. Definitions

Mild steel black pipes refers to the steel pipe made of low carbon steel, the surface is black (usually the original hot rolled or cold drawn state), not galvanized or other anti-corrosion coating treatment.

Due to its stainless treatment, a thin black oxide film is formed on the surface, which provides initial protection to a certain extent, but the overall corrosion resistance is not as good as that of the treated steel pipe.

2. Manufacturing process

Hot rolling production: Common in the production of most black mild steel pipes, the low carbon steel billet is heated to the appropriate temperature and then rolled to make the pipe with the required outer diameter and wall thickness.
Cold drawing process: For products requiring higher dimensional accuracy or better surface quality, the cold drawing process can be used to cold process the hot rolled pipe to obtain a more accurate size and a more uniform wall thickness, but at the same time may increase work hardening.
Surface treatment: In the production process, the black steel pipe is usually not galvanized, but retain the original black surface; When anti-corrosion is required, spray painting, powder coating and other protective treatment can be carried out later.

3. Performance characteristics

Excellent weldability and processability
Low carbon steel has a low carbon content, easy to weld and process, suitable for a variety of connection methods (such as welding, thread welding, etc.).
Low cost
Compared with stainless steel or alloy steel, mild steel black pipes material cost is lower, better economy, suitable for large-scale applications.
Mechanical stability
Hot and cold rolling processes make the product have good strength and toughness to meet the requirements of the general structure and conveying system.
Limited corrosion resistance
Because the surface has not been galvanized or other anti-corrosion treatment, the black mild steel pipe is susceptible to environmental factors such as humidity and chemical media, and long-term use requires additional anti-corrosion measures, such as painting, wrapping anti-corrosion coatings or cathodic protection.

4. Main applications

Pipeline transport
It is commonly used in water, gas, oil and natural gas delivery systems, but requires additional protection in more corrosive environments.
Building and structural engineering
Used as a building structure, frame or support component, due to light weight, high strength, suitable for bearing and structural connection.
Industrial equipment
In machinery manufacturing, oil field equipment and other fields, black low carbon steel pipe as an economic pipe is widely used.

Conclusion

Mild steel black pipes is widely used in many engineering and industrial applications due to its low cost, good processing performance and stable mechanical properties. However, due to its limited anti-corrosion performance, it is often necessary to combine anti-corrosion coating, cathodic protection or other protective measures to ensure long-term stable operation. Manufacturers in the production process, through hot rolling, cold drawing and other processes to control the size and quality of the product, combined with appropriate subsequent surface treatment, can produce both meet the technical requirements and have good economic black low carbon steel pipe.