Coated composite steel pipe is a pipe with special materials coated on the surface of the steel pipe to enhance its performance. It combines the strength advantages of steel pipes with the anti-corrosion, wear resistance, and high temperature resistance of coatings, and is widely used in oil, natural gas, chemical industry, construction, water supply and other fields.

1. Common coatings for steel pipes: epoxy resin, polyethylene (PE), polypropylene (PP), polyurethane (PU), etc.

Features: corrosion resistance, chemical resistance, suitable for conveying corrosive liquids or gases.

Application: oil, natural gas pipelines, chemical pipelines.

2. Advantages of coated composite steel pipes

1. Corrosion resistance:

The coating effectively isolates the steel pipe from contact with corrosive media and extends its service life.

2. Wear resistance:

The coating increases the surface hardness of the steel pipe and reduces wear.

3. High temperature resistance:

The special coating enables the steel pipe to work stably in high temperature environments.

4. High strength:

The steel pipe matrix provides high strength and is suitable for high pressure and high load scenarios.

5. Easy installation:

Coated composite steel pipes are light in weight and have various connection methods, which makes them easy to construct.

6. Economical:

Although the initial cost is high, long-term use can reduce maintenance and replacement costs.

3. Production process of coated composite steel pipes

1. Surface treatment:

The surface of the steel pipe is treated with rust removal, cleaning, sandblasting, etc. to ensure the adhesion of the coating.

2. Coating:

The coating material is evenly applied to the surface of the steel pipe by spraying, dipping, electrostatic spraying and other processes.

3. Curing treatment:

The coating is cured by heating or ultraviolet irradiation to form a dense protective layer.

4. Quality inspection:

The coating thickness, adhesion, corrosion resistance, etc. are tested to ensure product quality.

IV. Application areas of coated composite steel pipes

1. Oil and gas:

Used for transporting crude oil, natural gas, refined oil, etc.

2. Chemical industry:

Used for transporting corrosive media such as acids, alkalis, and salts.

3. Construction engineering:

Used for water supply, drainage, HVAC pipelines.

4. Mining and metallurgy:

Used for transporting slurry, tailings, coal, etc.

5. Food and medicine:

Used for transporting food, beverages, medicines, etc.

6. Power industry:

Used for cable protection, thermal pipeline protection, etc.