Carbon Steel Pipe Welded Hot Rolled Seamless Steel Pipe

Carbon Steel Pipe
Carbon steel pipe is a strong material widely used in many industries. It is mainly divided into two types: hot rolled and cold rolled (drawn).

Hot Rolled Carbon Steel Pipe:

Manufacturing process: Hot rolled carbon steel pipe is made by heating the steel above the recrystallization temperature (about 926°C to 1400°C) and rolling it. This process can destroy the cast structure of the steel billet, refine the grains, and eliminate microstructural defects, thereby improving the mechanical properties of the steel.

Advantages:
High strength: The hot rolling process refines the grains of the steel and improves the mechanical properties, especially in the rolling direction.
Cost-effectiveness: The hot rolling process is relatively simple, low-cost, and suitable for large-scale production.
High customization: Pipes of different sizes and shapes can be customized according to customer needs.

Cold Rolled/Drawn Carbon Steel Pipe:

Manufacturing process: Cold rolled (drawn) carbon steel pipes are rolled or drawn below the recrystallization temperature. This process can further improve the dimensional accuracy and surface finish of the pipe.

Advantages:
High precision: high dimensional accuracy and good surface finish, suitable for equipment requiring high precision.
Good corrosion resistance: The cold rolling process makes the pipe surface smoother and reduces the possibility of corrosion.

Hot Rolled Seamless Steel Pipe
Hot rolled seamless steel pipe is a steel pipe without welds, which is manufactured through a high temperature rolling process.

Manufacturing process:

Bill heating: The billet is heated to a high temperature state.

Piercing: The billet is punched into a hollow rough tube by a piercing machine.

Rolling: The rough tube is rolled into a steel pipe of the required size through multiple rolling passes.

Cooling and sizing: Sizing treatment is performed after cooling to ensure the dimensional accuracy of the pipe.

Hydrostatic test: Hydrostatic test is performed to ensure the sealing and strength of the pipe.

Advantages:

High strength: Hot rolled seamless steel pipe has high strength and good mechanical properties, and can withstand high pressure and high temperature.

No leakage: The seamless design ensures that the pipe will not leak during use, and is suitable for conveying liquids and gases.

Cost-effectiveness: The manufacturing process is relatively simple, the cost is low, and it is suitable for large-scale production.

Application areas
Hot-rolled carbon steel pipes:
Construction industry: used for building structures, brackets and frames.
Oil and gas industry: used to transport oil, natural gas and coal gas.
Chemical industry: used to transport chemical liquids and gases.
Shipbuilding: used for ship structures and piping systems.
Hot-rolled seamless steel pipes:
Oil and gas industry: used to transport high-pressure gases and liquids.
Chemical industry: used to transport high-temperature and high-pressure chemical media.
Construction industry: used for building structures and supports.
Shipbuilding: used for ship piping systems and junctions.

Standards:
GB/T 8162/8163: Chinese national standards.
ASME B36.10: American Society of Mechanical Engineers standard.
ASTM A106/A53: American Society for Testing and Materials standard.
API 5L/5CT: American Petroleum Institute standard.
DIN: German Industrial Standard

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