Epoxy coated steel pipe

Definition：

An epoxy coated steel pipe is a steel pipe coated with epoxy resin for protection. Epoxy resin anti-corrosion steel pipes are based on steel pipes. The outer wall is coated with high adhesion, impact resistance, anti-corrosion and weather-resistant thermosetting powder coating, and the inner wall is coated with high adhesion, anti-corrosion, food-grade hygienic thermoplastic powder coating. The third layer (protective layer): polyolefin.Typically, this type of pipe comprises an inner layer of steel pipe and an outer layer of epoxy resin coating.

Manufacturing Process of Epoxy Coated Steel Pipes

Overview:

Epoxy coated steel pipes feature a coating structure with an outer layer of epoxy resin paint, often lined with polyethylene. They exhibit excellent anti-corrosion properties and good mechanical characteristics, making them extensively used in transportation pipelines within the petroleum, chemical, and natural gas industries. This article aims to introduce the manufacturing process and characteristics of epoxy resin anti-corrosion steel pipes.

Manufacturing Process:

1. Steel Pipe Surface Treatment:
   Begin by removing rust and oil from the steel pipe’s surface to ensure proper adhesion between the coating and the steel surface. Common surface treatment methods include pickling, sandblasting, and mechanical polishing.
2. Inner Coating:
   Apply an epoxy resin coating to the inner surface of the steel pipe, ensuring control over coating thickness and uniformity. Heat and solidify the coating to achieve full integration with the steel surface.
3. Outer Coating:
   Apply a polyethylene coating to the cured inner coating by evenly melting it at high temperatures. The thickness and uniformity of the outer coating significantly impact the anti-corrosion effectiveness and service life.
4. Cooling and Packaging:
   Control the cooling rate to prevent steel pipe deformation during the cooling process. Proper packaging is essential to protect the steel pipes from damage during transportation.

Characteristics:

Epoxy coated steel pipe melts and bonds above the softening point temperature and integrates with polyethylene, showing strong adhesion. Therefore, the adhesive in the three-layer PE has strong adhesion. It has the advantages of high water absorption and resistance to cathode peeling, and can be co-extruded with the protective layer polyethylene during the construction process to facilitate construction.

1. Excellent Anti-corrosion Performance:
   Epoxy resin coatings offer high adhesion and corrosion resistance, effectively preventing corrosion both internally and externally. Polyethylene coatings provide additional properties such as impact resistance, wear resistance, and high-temperature resistance, further enhancing pipeline anti-corrosion performance.
2. Good Mechanical Properties:
   Epoxy resin anti-corrosion steel pipes exhibit high strength and stiffness, capable of withstanding significant pressure and shear forces. They also possess good wear resistance, impact resistance, and low-temperature resistance, ensuring safe operation in various harsh environments.
3. Convenient Construction:
   These steel pipes are easy to install using welding, threaded connections, etc. Their lightweight facilitates transportation and installation.
4. Long Service Life:
   Due to the excellent performance of epoxy resin and polyethylene coatings, epoxy resin anti-corrosion steel pipes offer a long service life of over 30 years, reducing maintenance and replacement costs.

Application Areas:

Epoxy coated steel pipes find widespread application in transmission pipelines within the petroleum, chemical, and natural gas industries. The efficient anti-corrosion performance and good mechanical properties make them an ideal choice for such transmission pipelines, directly impacting product quality and safety.

Conclusion:

Epoxy coated steel pipes possess outstanding anti-corrosion properties and good mechanical characteristics, making them ideal for transmission pipelines in various industries. Their manufacturing process involves steel pipe surface treatment, inner and outer coating application, cooling, and packaging. With convenient construction and long service life, these steel pipes meet the pipeline requirements in diverse environments. With advancing technology and expanding applications, epoxy resin anti-corrosion steel pipes will continue to play a significant role in the future.

Cangzhou DoubleDragon Steel Pipe Co., Ltd specializes in the production of outer-coated steel pipes, including epoxy-coated spiral steel pipes. The factory has been established for 30 years, with production diameters of 8-140 inches and wall thicknesses of 6-26mm. Friends from all over the world are welcome to exchange and consult.