Steel-plastic composite pipes and plastic-coated composite steel pipes are steel-plastic composite pipes that use steel pipes as the base, and have a plastic anti-corrosion layer welded on the inner surface of the steel pipe (bottom pipe) or on the inner and outer surfaces through spraying, rolling, dipping, and suction processes. Plastic-coated steel pipes have excellent corrosion resistance and relatively small friction resistance. Epoxy resin coated steel pipes are suitable for the transportation of water supply and drainage, seawater, warm water, oil, gas and other media, and polyvinyl chloride coated steel pipes are suitable for the transportation of drainage, seawater, oil, gas and other media. Plastic coated steel pipe has excellent properties and can adapt to humid environment. It can not only withstand high temperature but also be used in places with extremely low temperature. 2. Plastic coated steel pipe has very strong anti-interference ability. If it is used as a cable casing, it can effectively shield the interference of external signals. 3. Because a layer of plastic anti-corrosion layer is welded on the surface of plastic coated steel pipe, it has good insulation. As a protective tube for wires, there will be no leakage. 4. The bearing capacity of plastic coated steel pipe can reach up to 6Mpa, which can be said to be an excellent pressure bearing capacity. 5. The plastic coated surface has no burrs and the pipe wall is smooth. There is no need to worry about the problem of wearing wires or cables during construction. 3. Disadvantages of plastic coated steel pipe .
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