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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
Layer Structure
|
Layer |
Material Options |
Thickness Range |
Function |
|
Outer |
Carbon Steel (Q235B) |
1.5-6mm |
Structural support |
|
Bonding |
Thermoplastic adhesive |
0.1-0.3mm |
Interlayer bonding |
|
Inner |
HDPE/PP-R/CPVC/PVDF |
2-5mm |
Corrosion barrier |
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
|
Parameter |
Steel-Plastic |
Galvanized Steel |
FRP |
PVC |
|
Corrosion |
Excellent |
Good |
Excellent |
Poor |
|
Strength |
High |
High |
Medium |
Low |
|
Weight |
Medium |
Heavy |
Light |
Very Light |
|
Cost |
Medium |
Low |
High |
Very Low |
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)
Plastic-steel Composite Pipe Customer Evaluation
Plastic-steel Composite Pipe FAQ
-
What is plastic-steel composite pipe?
It is a new composite pipeline that uses steel as the reinforcing layer and plastic as the anti-corrosion layer, integrating strength and corrosion resistance.
-
What media can it transport?
It can transport water, oil, gas, chemical medium, sewage and other fluids, suitable for both civil and industrial projects.
-
What connection methods are available?
Common connection methods include flange connection, threaded connection and grooved connection, which are firm and leak-proof.
-
What is the service life of plastic-steel composite pipe?
Under normal working conditions, its service life can reach more than 50 years.
Apr 16,2026
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