Plastic-coated composite steel pipe
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Product Description
Plastic-coated composite steel pipe
Specifications: ФDN100–ФDN1800
Standard: “Plastic-Coated Composite Steel Pipe for Water Supply” CJ/T120-2016
Plastic-coated composite steel pipe is a newly developed type of pipeline material in China. It features a composite structure with both inner and outer protective plastic coatings, and an intermediate layer made of either reinforced welded steel pipe or seamless pressure-resistant steel pipe. This design overcomes the inherent drawbacks of steel pipes—such as susceptibility to rusting, corrosion, high pollution levels—as well as the weaknesses of plastic pipes, including low strength and easy deformation. By integrating the advantages of both steel and plastic materials, this product qualifies as an environmentally friendly item promoted for nationwide use. The plastic-coated composite steel pipe is manufactured by fusing a layer of organic material—such as polyethylene (PE) resin, ethylene-acrylic acid copolymer (EAA), epoxy (EP) powder, non-toxic polypropylene (PP), or non-toxic polyvinyl chloride (PVC)—with a thickness ranging from 0.5 to 1.0 mm onto the inner wall of the steel pipe. This steel-plastic composite pipe not only retains the high strength, ease of connection, and resistance to water flow impacts characteristic of steel pipes but also addresses the shortcomings of steel pipes, such as their tendency to corrode, pollute, and scale when exposed to water, as well as the low strength and poor fire-resistance performance of plastic pipes. Its designed service life can reach up to 50 years. The main limitation is that during installation, bending is strictly prohibited. When performing hot working or electric welding/cutting operations, the cut surfaces must be coated with a non-toxic, room-temperature curing adhesive provided by the manufacturer.
Production process
Coated composite steel pipes are categorized into the following processes: hot-dip plastic coating, internal and external spray coating, rotational molding, dip coating, vacuum coating, and fusion-winding coating.
1. Hot-dip plastic coating utilizes fluidized-bed plastic coating and a one-step film-forming process. Also known as the first-generation anti-corrosion coating for coated steel pipes, it features polyethylene both inside and outside.
2. Internal and External Coating Process: This process utilizes the principle of electrostatic adsorption. After pretreatment of the steel pipe, polyethylene or epoxy resin powder is applied via spray guns. It is also known as the second-generation anti-corrosion coating for steel pipes—internally and externally coated with epoxy composite material.
3. Dip-Coating Process: Also known as the curtain coating method, this process involves using a sieve containing powder to apply a coating onto the heated outer surface of steel pipes via a dipping technique.
This process can produce externally polyethylene- and internally epoxy-coated composite steel pipes, also known as the third-generation anti-corrosion coated steel pipes.
4. Fusion Bonded Wrapping Process: This process employs hot-melt fusion wrapping, in which hot-melt adhesive and polyethylene are extruded and wrapped around a heated steel pipe. The materials react to form a three-layer structure known as the fusion-bonded epoxy/extruded polyethylene protective coating.
This process enables the production of polyethylene-coated steel pipes with a three-layer structure, featuring an internally fusion-bonded epoxy coating. It is also known as the fourth-generation anti-corrosion coating for coated steel pipes.
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