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Coated composite anti-corrosion steel pipe is a steel plastic composite pipe that uses steel pipe as the substrate and fuses plastic anti-corrosion coating (such as epoxy resin, polyethylene) on the inner and outer surfaces of the steel pipe through processes such as spraying, rolling, immersion, and suction. The inner core is usually made of welded steel pipe or seamless steel pipe, and the outer plastic layer not only retains the mechanical strength of the steel pipe, but also isolates the external corrosive medium through an anti-corrosion layer, combining the rigidity of metal pipes with the corrosion resistance of plastics.
keyword Coated composite anti-corrosion steel pipe Category Anti-coating pipe name Related products Get a quoteCoated composite anti-corrosion steel pipe
Definition and Structure of Coated Composite Anti Corrosion Steel Pipe
Coated composite anti-corrosion steel pipe is a steel plastic composite pipe that uses steel pipe as the substrate and fuses plastic anti-corrosion coating (such as epoxy resin, polyethylene) on the inner and outer surfaces of the steel pipe through processes such as spraying, rolling, immersion, and suction. The inner core is usually made of welded steel pipe or seamless steel pipe, and the outer plastic layer not only retains the mechanical strength of the steel pipe, but also isolates the external corrosive medium through an anti-corrosion layer, combining the rigidity of metal pipes with the corrosion resistance of plastics.
Anti corrosion performance and process characteristics
This pipe is made of 3PE (three-layer polyethylene) TPEP、 Epoxy powder, FBE (fusion bonded epoxy) and other anti-corrosion processes result in uniform coating thickness and strong adhesion. Pre treatment (such as sandblasting) is crucial for the anti-corrosion effect, as the coating is tightly bonded to the steel pipe substrate. Its corrosion resistance can resist the erosion of media such as acid, alkali, salt, oil and gas, and its high temperature resistance is suitable for environments ranging from -30 ℃ to 100 ℃, with some processes lasting for more than 50 years.
application area
Coated composite anti-corrosion steel pipes are widely used in the transportation of petroleum, natural gas, and chemical media, urban water supply and drainage, fire protection systems, power cable protection, and building HVAC engineering. Especially in the field of fire protection, its high pressure resistance and anti scaling characteristics ensure the reliability of the sprinkler system; In municipal engineering, it can replace traditional galvanized pipes and solve the problem of rust pollution. In addition, it is also used for special environments such as anti-corrosion and gas transportation in coal mines.
Key points of construction and installation
During construction, it is necessary to use a metal saw to cut and smooth out the burrs on the port, and special repair fluid should be used to treat the damaged coating. The connection methods include grooves, flanges, welding, etc. Among them, groove connections need to pay attention to coating repair after groove rolling. Before installation, the inner wall of the pipeline should be thoroughly cleaned and coated with primer. The construction environment should be kept clean to avoid coating contamination, and the temperature and time should be controlled during the curing stage.
Production process and quality control
The production process includes surface treatment of steel pipes (sandblasting and rust removal), preheating, powder electrostatic spraying or dipping, high-temperature curing, and other processes. The epoxy resin coating needs to meet food grade safety standards, and the polyethylene layer needs to meet wear and impact resistance requirements. Quality control includes coating thickness testing, adhesion testing (such as peel testing), and electrical discharge leak detection, with no defects such as pores or cracks.
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