The use of steel pipes can be classified according to their application fields and functions, mainly divided into the following categories:

1. Pipeline pipes

‌Fluid transportation‌: used to transport fluid media such as water, gas, oil, natural gas, such as urban water supply pipelines, gas transmission pipelines, oil and gas trunk pipelines, etc.

‌Agricultural irrigation‌: used as water pipes and sprinkler equipment for agricultural irrigation systems.

2. Pipes for thermal equipment

‌Boilers and pressure vessels‌: used to manufacture superheated steam pipes, smoke pipes and high-pressure vessels of boilers, etc.

‌Heat exchange equipment‌: used as heat exchanger pipes in chemical equipment, such as the cooling system of cracking reactors.

3. Pipes for mechanical industry

‌Automobile and transportation‌: used for automobile drive shafts, half shafts, oil coolers and other parts.

‌Aerospace‌: manufacturing aircraft structural parts (such as round tubes, elliptical tubes) and engine parts.

‌Precision instruments‌: used for the manufacture of instrumentation (such as watch cases) and medical devices (such as injection needles).

4. Pipes for petroleum geological drilling

Drilling equipment: used as oil drill pipes, casing and core pipes to support drilling operations.

Oil production facilities: used for oil well casing and pipelines.

5. Pipes for the chemical industry

Chemical equipment: used to transport media in cracking reactors and acid-base environments.

Anti-corrosion treatment: used to manufacture acid- and alkali-resistant containers and pipelines (such as stainless steel or galvanized steel pipes).

6. Containers and special-purpose pipes

High-pressure containers: used for pressure vessels such as high-pressure gas cylinders and storage tanks.

Building structures: used as scaffolding steel pipes or building support structures.

Special processes: used in the manufacture of military equipment such as gun barrels and cannon barrels.