Internal and external plastic-coated spiral steel pipes are a new type of pipeline material developed through years of research and testing. They are based on spiral steel pipes and are coated with modified epoxy resin powder on both their inner and outer walls. The plastic coating has a strong bond with steel, excellent corrosion resistance, reduces friction, prevents corrosion, withstands pressure, and has antibacterial properties, with good chemical stability and water resistance. They are generally not restricted by the conveyed medium and have no concerns about leaks, drips, or cracks. They are widely used in fluid transportation for construction water supply, fire protection, oil, gas, chemical, sewage, mining, and agricultural irrigation, replacing traditional pipeline materials such as cast pipes and steel pipes that are energy-intensive, prone to rust, scaling, have short service life, and are heavy to transport. Technical parameters of internal and external plastic-coated composite steel pipes: Coating Material: Epoxy Resin Common Color: White Coating Thickness: 200um—500um Coating Method: Internal and external spraying or external galvanized internal spraying Product Specifications: DN15—DN1200 Environmental Temperature: -30℃ to 80℃ Standard Pressure: 0.1Mpa—2.5Mpa (Note: Customization is also available according to customer requirements for steel pipe material, wall thickness, size, and pressure-bearing capacity) Connection Methods: Threaded, socket, spigot, grooved, flanged connections, etc. Application Fields: Municipal, water supply and drainage, sewage, chemical, thermal power, reclaimed water, and other transmission pipelines Product Features: This composite steel pipe uses thermosetting熔结epoxy resin powder to coat the surface of the steel pipe, resulting in a smooth and aesthetically pleasing surface with strong corrosion and water resistance. Due to the smooth inner wall, it prevents the growth of microorganisms during use and reduces the resistance of the conveyed fluid.

Internal and external plastic-coated spiral steel pipes (such as epoxy resin coated pipes, polyethylene coated pipes, etc.) effectively prevent the damage caused by plant roots and soil environmental stresses from long-term underground burial. After surface frost protection treatment, they can be used in an environment of -30℃. Their service life is 1 to 2 times longer than that of other similar products. Steel-plastic composite pipes (such as epoxy resin coated pipes, polyethylene coated pipes, etc.) - News on the application of internal and external coated steel pipes with epoxy composite. With the Ministry of Construction issuing a notice to ban the use of galvanized steel pipes as water supply pipes and promote the application of new plastic pipe materials, there are many types of plastic water supply pipes on the market. Over the years of engineering applications, plastic pipes have exposed some problems and shortcomings. Due to the larger linear expansion coefficient of plastic pipes, some soft plastic pipes are not suitable for indoor exposed installations, as they can undergo thermal expansion and contraction, causing deformation and affecting aesthetics; their temperature and pressure resistance gradually decreases with the increase in the temperature of the transmitted medium and the length of service time; plastic water supply pipes are not suitable for outdoor exposed installations, as they are easily exposed to sunlight and ultraviolet radiation, accelerating aging; some large-diameter plastic pipes are neither suitable nor economical due to the high material consumption and difficulty in controlling the connection quality. The application of steel-plastic composite pipes in the water supply field has outstanding advantages.