Classification and characteristics of mild steel black pipes

Classification and characteristics of mild steel black pipes

mild steel black pipes is a kind of pipe made of mild carbon steel, because its surface has a layer of black oxide film, so it is called black pipes. This layer of oxide is naturally formed during the manufacturing process, and the black appearance indicates that the surface has not been galvanized or other surface treatment. mild steel black pipes because of its high strength, good processability and economy, is widely used in fluid transportation, building structure and industrial manufacturing and other fields, is an important pipe choice in the field of industry and construction. The following is to introduce the classification and characteristics of mild steel black pipes.

Classification of mild steel black pipes

According to different standards, mild steel black pipes can be divided into the following categories:

1. Sort by material
(1) Ordinary carbon steel pipe: made of ordinary carbon steel such as Q195, Q215, Q235, with good toughness and plasticity, suitable for low-pressure pipes and structural support for general purposes.
(2) High-quality carbon steel pipe: made of 20#, 45# and other high-quality carbon steel, with higher strength and toughness, can be used for higher mechanical properties of the occasion.
2. Classification by manufacturing process
Hot rolled black tube: the low carbon steel billet is calcined at high temperature, and the solid steel rod is perforated and then rolled by the rolling mill. The surface is rough, and it is suitable for making pipes with large caliber and thicker wall.
Cold rolling or cold drawing black pipe: The pipe is further processed by cold rolling or cold drawing process to improve its accuracy and make the surface more smooth. Suitable for small caliber and high precision steel pipe.
Welded black tube: produced by welding steel strips or plates, suitable for low-pressure fluid transport.
3. Categorize by use
Fluid transport pipe: used to transport water, oil, gas and other low pressure fluids.
Structural pipe: used to make scaffolding, building structures and mechanical parts.
Boiler tube: heat transfer pipe suitable for low pressure boilers and heat exchangers.
Gas piping: Gas piping systems that can be used in cities.
4. Divide by wall thickness
Thin wall tube: thin wall thickness, light weight, suitable for low pressure fluid transport.
Thick wall pipe: thick wall thickness, high strength, strong pressure resistance, suitable for high load or high pressure occasions.

Characteristics of mild steel black pipes

Material composition: made of low carbon steel, carbon content is less than 0.25%, with good toughness, weldability and processability.
Surface characteristics: The surface is covered with a black oxide layer formed naturally during the manufacturing process, which can provide certain corrosion resistance, but cannot be used in extreme or strong corrosive environments.
Strength and durability: mild steel black pipes have the advantages of high strength and good durability, which can meet most structural and low pressure needs.
Workability: mild steel black pipes are generally easy to cut, weld, and bend, making them suitable for situations requiring specific shapes.

In summary:

mild steel black pipes because of its unique appearance color, as well as high strength, low cost, easy processing and other characteristics, is widely used in the field of industry and construction, is an important pipe choice in the field of industry and construction. mild steel black pipes can meet the diversified needs of users according to different processes and uses.

read more: Mild steel, medium carbon steel, high carbon steel difference or Mild steel black pipes