EP epoxy resin internal and external spray anti-corrosion steel pipe

Characteristics and production process of EP epoxy resin internal and external spray anti-corrosion steel pipe material

EP epoxy resin internal and external spray anti-corrosion steel pipes are made of steel pipes as the substrate, using synchronous internal and external coating technology. The inner wall is coated with epoxy resin powder, and the outer wall can be matched with anti-corrosion coatings such as polyethylene (PE) or epoxy coal tar. Epoxy resin has excellent chemical stability, corrosion resistance, and insulation properties. The coating thickness can be adjusted (usually above 300 μ m), and a dense protective layer is formed by high-temperature curing. It has strong adhesion and is not easy to peel off. The production process includes steps such as steel pipe pretreatment, electrostatic spraying or fluidized bed immersion coating, high-temperature curing, coating uniformity, and mechanical strength.

Application Fields and Scenarios

This pipe is widely used in low-pressure fluid transportation (such as tap water, gas), cable protection, building fire protection systems, and mine environments. In the field of fire protection, its high temperature resistance and flame retardancy meet safety requirements; In mines, anti-static and flame-retardant properties can resist the risk of flammability and explosion. For example, a groundwater transportation project in a certain city uses this type of steel pipe, which significantly extends the pipeline time and reduces maintenance costs. In addition, its smooth inner wall reduces fluid resistance and prevents microbial growth, making it suitable for transporting high sulfur water or media containing calcium and magnesium ions.

Performance advantages and economic benefits

Compared to traditional galvanized or stainless steel pipes, EP epoxy resin steel pipes have lower overall costs and can last for more than 50 years. It is easy to install and supports multiple connection methods such as grooves, flanges, and welding. It also has high compressive strength (able to withstand harsh mechanical impacts) and weather resistance (suitable for environments ranging from -30 ℃ to 90 ℃). The chemical corrosion resistance of epoxy resin coating reduces the maintenance needs caused by medium erosion, and the long-term cost-effectiveness is significantly higher than that of plastic pipes.

Comparison with other anti-corrosion technologies

Compared to single-layer PE anti-corrosion or 3PE structure, EP coated steel pipes have better adhesion, cathodic peel resistance, and high temperature resistance. For example, the inner oxygen outer PE structure combines the chemical stability of epoxy with the mechanical protection of PE, making it more suitable for complex corrosive environments than traditional anti-corrosion methods. At the same time, its flame retardant and anti-static properties meet the standards of special scenarios such as mines, and are superior to ordinary plastic pipes.

Industry standards and quality control

The product must comply with national standards such as GB/T5135 and CJ/T120, and the coating must pass adhesion (≥ 30N/10mm), flame retardancy, and anti-static tests. During the production process, quality inspection methods such as ultrasonic testing and hydrostatic pressure testing are used to ensure that the base pipe has no defects and the coating has no pores. Some application scenarios (such as drinking water transportation) also need to meet food grade hygiene standards and ensure medium safety.