What is the anti-corrosion structure and principle of the 3PE anti-corrosion steel pipe

3PE anti-corrosion steel pipe is a type of steel pipe that uses a three-layer polyethylene (3PE) coating for external corrosion protection. Its base materials mainly include seamless steel pipe, spiral steel pipe, and straight seam steel pipe. This type of anti-corrosion steel pipe is widely used in many regions due to its excellent anti-corrosion performance, long service life, and wide applicability.

What is the anti-corrosion structure and principle of the 3PE anti-corrosion steel pipe? Specifically:

1. Bottom Layer: Epoxy powder (FBE) coating, thickness greater than 100 micrometers. This layer is in direct contact with the steel pipe surface, providing initial protection through its good adhesion and anti-corrosion performance.

2. Middle Layer: Adhesive (AD) layer, thickness between 170 and 250 micrometers. The main function of this layer is to enhance the adhesion between the epoxy powder coating and the high-density polyethylene anti-corrosion coating, ensuring a tight bond between the two.

3. Surface Layer: High-density polyethylene (HDPE) anti-corrosion coating. This is the outer layer of the anti-corrosion coating, possessing excellent corrosion resistance, durability, and impact resistance.

3PE anti-corrosion steel pipes use polyethylene material, which has good corrosion resistance and can resist the erosion of various corrosive media, extending the service life of the steel pipe. Polyethylene material has a high molecular weight and good stability; under normal operating temperature and pressure, its service life can be confirmed to exceed 50 years. Polyethylene material has excellent impact resistance and seismic resistance, enabling 3PE anti-corrosion steel pipes to maintain stable performance even under harsh environmental conditions. No heavy metal stabilizers are added during the processing of polyethylene material, making it clean, harmless, and recyclable, thus environmentally friendly. The connection methods for 3PE anti-corrosion steel pipes are mainly hot-melt or electrofusion connections, with the interface material consistent with the pipe body, ensuring connection integrity and sealing.

The production process of 3PE anti-corrosion steel pipes mainly includes steel uncoiling, impurity removal, steel pipe forming, surface treatment, steel pipe heating, epoxy powder spraying, adhesive and polyethylene extrusion coating, water cooling, pipe cutting, and beveling. These processes ensure that the quality and performance of 3PE anti-corrosion steel pipes meet standard requirements.

3PE anti-corrosion steel pipes are widely used in multiple areas due to their excellent performance:

1. Oil and Gas Transportation: In oil and gas transportation areas, 3PE anti-corrosion steel pipes can withstand high pressure and corrosive media for extended periods, ensuring stable pipeline operation.

2. Chemical Industry: In chemical areas, many media possess corrosive properties such as strong acids, strong alkalis, or high temperatures. 3PE anti-corrosion steel pipes effectively resist the erosion of these corrosive media.

3. Heating Systems: In urban heating systems, 3PE anti-corrosion steel pipes are widely used to transport hot water and steam. Their high-temperature resistance and corrosion resistance ensure the stable operation of the heating system.

4. Water Conservancy Projects: In water conservancy projects, such as drainage systems, water supply systems, and irrigation systems, 3PE anti-corrosion steel pipes also play an important role, extending the service life of pipelines and reducing maintenance costs.

5. Other Areas: In addition, 3PE anti-corrosion steel pipes can also be used in municipal engineering, building structures, shipbuilding, power engineering, and other areas, meeting the needs of various environmental conditions.