Plastic-steel Composite Pipe

1.Product Overview​​

Steel-plastic composite pipes combine the strength of steel with the corrosion resistance of plastics, creating a high-performance piping solution for demanding applications.

​​Key Advantages​​

​​Dual-Layer Protection​​: Steel provides structural integrity while plastic resists corrosion

​​Long Service Life​​: 50+ years design life under normal conditions

​​Smooth Interior​​: Plastic lining minimizes fluid resistance and prevents scaling

​​Cost Effective​​: More economical than solid stainless steel with similar performance

​​2. Construction & Materials​​

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Layer Structure​​

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3. Technical Specifications​​

​​Performance Characteristics​​

​​Pressure Rating​​: PN1.0-PN2.5MPa (higher available)

​​Temperature Range​​: -40°C to 110°C (depends on liner material)

​​Diameter Range​​: DN15-DN1200

​​Burst Pressure​​: ≥3× working pressure

​​Thermal Expansion​​: 0.035mm/m°C (1/10 of plastic pipes)

​​Comparison with Alternative Pipes​​

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4. Product Types​​

​​By Manufacturing Process​​

1.Mechanically Lined Pipes​​

Cold-drawn steel pipe with shrink-fit plastic liner

Suitable for DN15-DN300 sizes

2.Extrusion Bonded Pipes​​

Plastic extruded onto prepared steel surface

Better for large diameters (DN300+)

By Liner Material​​

​​HDPE​​: General chemical resistance

PP-R​​: Higher temperature tolerance

PVDF​​: Superior chemical/abrasion resistance

​​CPVC​​: Hot water applications

​​5. Applications​​

✔ Chemical Processing Plants

✔ Oil & Gas Gathering Systems

✔ Mining Slurry Transport

✔ High-Purity Water Systems

✔ Marine & Offshore Platforms

✔ Food & Beverage Processing

​​6. Installation & Maintenance​​

​​Connection Methods​​:

Flanged joints

Grooved couplings

Threaded ends (small diameters)

​​Field Cutting​​: Requires proper deburring of steel layer

​​Inspection​​: Regular checks for outer coating damage

Repair​​: Epoxy-based compounds for minor damage

​​7. Quality Assurance​​

Certifications​​: ISO 9001, NSF/ANSI 61, API 15LE

Testing​​:

Adhesion test (ASTM D4541)

Hydrostatic test (ISO 1167)

Impact test (ASTM D2444)

​​Warranty​​: 10 years against manufacturing defects

​​8. Packaging & Delivery​​

Standard Lengths​​: 6m or 12m

Protection​​: Plastic end caps + outer wrapping

Marking​​: Laser-etched with specifications

MOQ​​: 1 ton (custom orders accepted)