Cangzhou City, Hebei Province, China

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Hebei Hengtong Pipe Fittings Group Co., Ltd.

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Three-layer polyethylene‑coated anti-corrosion steel pipes use Q235B and Q355B carbon steel pipes as the base material. Through a specialized coating process, a three‑layer composite anti-corrosion coating is formed on the pipe’s outer surface, consisting of a fusion‑bonded epoxy powder primer, a copolymer adhesive intermediate layer, and a high‑density polyethylene outer protective layer. The finished pipes can resist corrosion from soil, groundwater, and acidic media, effectively extending pipeline service life and reducing subsequent maintenance costs.

Our factory offers a complete range of specifications, with nominal diameters spanning DN20 to DN3600 and wall thicknesses from 3 mm to 20 mm, suitable for a wide variety of pressure conditions. We implement a rigorous, end-to-end raw-material inspection system, conducting batch-by-batch testing of steel pipe substrates, epoxy powders, adhesives, and other materials to ensure stable product performance right from the source. The outer layer of high-density polyethylene can be customized according to the required corrosion‑protection grade, delivering excellent flexibility and impact resistance, and minimizing the risk of damage during transportation and installation.

Product Overview

Three-layer polyethylene‑coated corrosion‑resistant steel pipe is a composite anti-corrosion pipeline that uses ordinary carbon steel pipe as its base. After standardized surface treatment, the outer wall of the pipe is coated with one or more layers of polyethylene protective coating; the industry’s mainstream products employ a mature three‑layer composite structure. These layers work in concert to form a complete anti-corrosion barrier, effectively isolating the pipe from soil, groundwater, and corrosive acidic substances, thereby significantly extending the service life of the pipeline and reducing maintenance and replacement costs. The complete product system comprises four core components, each with an independent structure and clearly defined functions, as detailed below:

1. Fusion-bonded epoxy powder primer

The first anti-corrosion protective layer has a coating thickness of at least 120 μm, forming a strong chemical bond with the steel pipe substrate. It exhibits excellent adhesion and outstanding resistance to chemical corrosion, while also providing reliable electrical insulation.

2. Copolymer adhesive interlayer

The transition adhesive layer, with a thickness ranging from 170 μm to 250 μm, firmly bonds the epoxy primer to the high-density polyethylene outer layer, preventing delamination and peeling of the coating. It exhibits stable heat resistance and aging resistance, maintaining its integrity and performance even under long-term exposure across a wide temperature range without embrittlement or degradation.

3. High-density polyethylene outer protective layer

The outermost physical protective layer is made of high-density polyethylene with a density of 0.940–0.960 g/cm³ and a tensile strength of ≥22 MPa. Coating thickness can be customized to meet different corrosion‑protection grades. The material exhibits excellent flexibility and impact resistance, effectively withstanding collisions, scratches, and compressive damage during transportation and on‑site installation.

4. Carbon steel pipe substrate

The pipe body is fabricated from high-quality Q235B and Q355B carbon steels; nominal diameters range from DN20 to DN3600, with wall thicknesses from 3 mm to 20 mm, enabling it to meet the transportation requirements of pipelines operating at various pressure ratings.

Raw Material Inspection Standards

The quality of raw materials directly determines the performance of the finished pipes. Our factory has established a standardized procurement and inspection control system, ensuring that each batch of raw materials undergoes rigorous testing before being put into production.

Base Pipe Raw Material Inspection

Strictly select qualified carbon steel pipe billets; in addition to requiring the steel mill to provide a complete test report, we conduct comprehensive re‑inspections of the material’s chemical composition, external dimensions, and mechanical properties to ensure that all parameters meet the production design specifications.

Coating Raw Material Inspection

Prioritize testing the key performance indicators of coating materials: for epoxy powder, focus on adhesion and resistance to cathodic disbondment; for copolymer adhesives, prioritize bond strength and thermal stability. Any non‑conforming raw materials shall be rejected without exception and strictly prohibited from entering production.

Tags:

Polyethylene-coated anti-corrosion steel pipe

Name: Polyethylene-coated anti-corrosion steel pipe
Brand: Hebei Hengtong Pipe Fittings Group Co., Ltd.
Availability: InStock

Three-layer polyethylene‑coated anti-corrosion steel pipes use Q235B and Q355B carbon steel pipes as the base material. Through a specialized coating process, a three‑layer composite anti-corrosion coating is formed on the outer surface of the pipe, consisting of a fusion‑bonded epoxy powder primer, a copolymer adhesive intermediate layer, and a high‑density polyethylene outer protective layer.

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Hengtong Pipe Fittings Group

Hebei Hengtong Pipe Fitting Group manufactures steel fittings with integrated R&D, production, sales and services. With independent IP rights, we focus on two core product lines: concrete pump components and premium industrial pipe fittings.