High chlorinated polyethylene heavy-duty anti-corrosion steel pipe

Structure and material characteristics of high chlorinated polyethylene heavy-duty anti-corrosion steel pipe products

High chlorinated polyethylene heavy-duty anti-corrosion steel pipe is a composite pipeline formed by using steel pipe as the substrate and coating the surface with high chlorinated polyethylene (HCPE) resin as the main anti-corrosion coating. HCPE has a chlorine content of over 60%, a saturated main chain structure, and stable chemical properties. The coating has extremely low permeability to water vapor, oxygen, and ions, and has excellent waterproof and corrosion resistance. It can resist the corrosion of chemical media such as acid, alkali, salt (such as 20% sulfuric acid, caustic soda, salt water), mineral oil, etc. Its coating also has flame retardancy, mold resistance, and weather resistance, and is suitable for temperatures ranging from -20 ℃ to 80 ℃.

Production process and technological advantages

The production of this steel pipe involves key processes such as shot blasting, rust removal, and coating. By using high-pressure foaming, winding, or spraying techniques, multiple layers of anti-corrosion structures are formed on the surface of steel pipes, including epoxy primer, adhesive layer, and high-density polyethylene (PE) outer protective layer. For example, the 3PE anti-corrosion process combined with fusion bonded epoxy powder (FBE), adhesive, and polyethylene significantly improves the anti-corrosion performance and can be used for up to 50 years. The production process complies with international and industry standards such as DIN30670 and SY/T0413, supports low-temperature construction (-15 ℃ to 50 ℃), and single component packaging is convenient for on-site operation.

Application Fields and Engineering Scenarios

This type of steel pipe is widely used in oil and gas transportation, chemical equipment, ships, bridges, mines, and municipal engineering. For example, in scenarios such as oil pipelines, natural gas pipelines, sewage treatment plant water tanks, and offshore platforms, their corrosion resistance and mechanical strength can cope with complex environments. In concrete or metal structures such as fire water tanks, cooling towers, and underground pipe galleries, the waterproof and anti-corrosion properties of coatings can effectively extend the service life of the facilities. In addition, its oil resistance and electrostatic conductivity (surface resistivity below 10 ΩΩ) make it suitable for the protection of the inner and outer walls of oil storage tanks.

Construction specifications and maintenance requirements

Before construction, the surface of the steel pipe needs to be sandblasted to Sa2.5 level, without oil stains or rust. Brush coating, roller coating or high-pressure airless spraying are used for painting, with a minimum interval of 6 hours between each coating. The recommended total dry film thickness is 60-100 microns (multi-layer coating is required in harsh environments). There is no need to remove the old paint film during maintenance, and the new coating can be firmly attached through solvent solubility. The construction environment should avoid conditions of rain, snow, high temperature (>50 ℃), and humidity>85%. When storing, keep away from sources of fire and maintain ventilation.

Environmental Protection and Economic Benefits

The HCPE coating production process does not produce harmful substances such as carbon tetrachloride, and the coating is non-toxic and meets environmental protection requirements. Its high solid content reduces solvent evaporation, and single-layer coating can achieve thicker films, reducing construction costs. Compared to traditional anti-corrosion techniques, its long service life and low maintenance requirements can significantly reduce the full lifecycle cost of pipelines, especially in long-distance pipelines and large-scale industrial facilities where economic benefits are prominent.