What are the applications of plastic-coated steel pipes in various industries

In recent years, my country's plastic-coated steel pipe manufacturing industry has developed rapidly, and plastic-coated steel pipes have gained recognition in various industries. Because plastic-coated steel pipes possess both the high strength of steel pipes and the chemical corrosion resistance of engineering plastics, with a surface smoothness of 0.3~1μm, they have a low resistance coefficient when transporting various fluids, do not breed bacteria or mold, and have good anti-scaling capabilities. Under normal circumstances, they can increase the fluid transport capacity by 7%~12% compared to steel pipes of the same diameter, while reducing transport power consumption by 15%. Their service life can reach 50~100 years. Therefore, plastic-coated steel pipes can be considered a new type of high-efficiency, energy-saving, environmentally friendly, and corrosion-resistant pipeline. Plastic-coated steel pipes are widely used in various industries in industrialized countries, such as oil and gas pipelines and water supply and drainage pipelines. Some countries have also adopted plastic-coated steel pipes for subsea manganese ore extraction and for nuclear power plants. China's plastic-coated steel pipes have been innovated and improved based on the introduction of foreign technology. In recent years, the quality of plastic powder coatings in my country has made significant progress. For several commonly used plastic powders, such as LLDPE powder and modified oxy-powder powder, domestic formulations have become increasingly mature, and reliable data from applications has been obtained, indicating that their quality has reached international advanced levels. It can be said that my country currently possesses the material conditions for the widespread application of plastic-coated steel pipes. The current issue is to quickly inform design departments in various industries about relevant information on plastic-coated steel pipes.

1. Plastic-coated Steel Pipes for Water Supply.
China is a populous country with scarce water resources. Using steel pipes or galvanized steel pipes during use can easily lead to corrosion, pollute water resources, and cause leaks. Furthermore, the galvanizing process pollutes the atmosphere, violating the principle of harmony between humans and nature. To avoid these problems, more and more projects are choosing to use internally and externally plastic-coated steel pipes. The inner wall of the plastic-coated steel pipe uses safe and environmentally friendly hot-melt bonded epoxy powder, which is safe and harmless. The outer wall uses 3PE anti-corrosion, increasing wear resistance and corrosion resistance, extending the service life of the steel, and facilitating construction and transportation.

2. Plastic-Coated Steel Pipes for Cross-Sea Bridge Columns.
Bridge columns operate in harsh environments exposed to seawater erosion, facing corrosion from microorganisms and seawater salinity. Therefore, the corrosion resistance of these columns needs to be more stringent than that used on land. Plastic-coated steel pipes effectively fulfill this responsibility. The coating of these pipes is uniform in thickness, and their adhesion, flexibility, abrasion resistance, seawater erosion resistance, and seawater corrosion resistance all meet marine corrosion protection requirements.

3. Plastic-Coated Steel Pipes for Cable Conduits.
Urban cables are indispensable, and protecting them is a crucial responsibility. Cables are generally buried underground and frequently cross roads and bridges. Plastic-coated steel pipes have strong compressive strength and corrosion resistance, allowing them to be used for decades even in complex geological environments. This reduces costs and conserves resources. DFPB heavy-duty bimetallic bridge guardrails further enhance corrosion protection by adding a double layer of electrochemical corrosion protection and a powder coating layer, resulting in superior performance.