Introduction
A plastic-coated steel pipe is a steel-plastic composite pipe, consisting of a steel base with a protective plastic layer on the inner and outer surfaces.
| Tolerance | ±1% | |||
| Technique | ERW or seamless | |||
| Grade | Q195, Q235, Q295, Q345, etc. | |||
| Outer Diameter | 21-2000mm, can be customized | |||
| Thickness | 1-80mm, can be customized | |||
| Length | 1-12m, can be customized | |||
| Inspection test | Bending test, low-temperature test, coating adhesion test | |||
Features
- Mechanical Strength
Welded steel pipes or seamless steel pipes as the base pipes to provide structural support and mechanical strength.
- Surface Protection
Plastic coatings such as PE, EP, PVC, PP, and EAA provide comprehensive protection for steel pipes, offering corrosion resistance, chemical protection, mechanical properties, strong adhesion, chemical corrosion resistance, etc.
- Easy Installation and Handling
Smooth, lightweight surfaces simplify transportation and installation, saving labor and minimizing downtime. 
Customization Options
- Base Material Selection
Base pipe material: welded steel pipes or seamless steel pipes.
- Coating Material
The coating material is selected based on application requirements. Such as polyethylene (PE), epoxy resin (EP), polyvinyl chloride (PVC), polypropylene (PP), and ethylene-acrylic acid copolymer (EAA).
- Length and Thickness Customization
Standard length: 1-12 m, thickness: 1-80 mm; both can be customized.
FAQ
Q: What standards, sizes, and quality tests do your plastic-coated steel pipes meet?
A: Comply with the GB/T28897 standard and offer a full range of specifications from DN15 to DN1200.
The anti-corrosion products have passed a 4800-hour salt spray test. Undergo electrical spark testing (with a detection voltage of 5kV) and adhesion scratch tests (reaching the 1st standard level) before leaving the factory.
Q: What is the manufacturing process of plastic-coated steel pipes?
A: The process involves several key steps: pre-treatment of steel pipes (cleaning, rust removal, phosphating); coating application (hot-dip coating, electrostatic spraying, rotational molding, etc.); curing and cooling; followed by quality inspection and packaging. The core goal is to ensure a strong bond between the plastic coating and the steel pipe.
Q: How are steel pipes pre-treated before coating?
A: Steel pipes undergo sandblasting to remove rust to the Sa2.5 standard, creating a surface roughness of 40–70 μm. This ensures the coating adheres properly.
Q: What coating methods are used, and how do they work?
A: Hot-dip coating: Steel pipes are preheated to 300°C, then immersed in a fluidized bed where epoxy powder melts at 180–220°C, forming a coating of 0.5–1.2 mm.
Electrostatic spraying: Powder is applied in a 50–80 kV high-voltage electric field, evenly adhering to the pipe surface, with thickness error controlled within ±0.1 mm.
Q: How is the coating cured and cooled?
A: The curing process uses segmented heating, typically 200°C for 20 minutes, to fully cross-link the coating. Pipes are then cooled with water to set the coating firmly.
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