Fusion-bonded epoxy powder-coated steel pipe

Overview

FBE corrosion-resistant steel pipes are manufactured using a single-layer fusion‑bonded epoxy powder coating process, with a coating thickness of no less than 100 μm and a maximum service temperature of up to 110°C. The products are produced via electrostatic high‑temperature spraying, ensuring that the epoxy coating forms a stable chemical bond with the steel pipe substrate. These pipes exhibit excellent insulation performance, with a cathodic disbondment strength of ≥30 N/cm, and are widely used in petroleum, natural gas, municipal water supply, and chemical‑corrosion‑resistant pipeline projects. Additionally, they serve as the primer layer for 3PE and 3PP composite anti‑corrosion steel pipes, significantly enhancing the overall corrosion protection of the pipeline system.

Core Product Advantages

Strong coating adhesion
The FBE coating bonds tightly to the steel pipe surface, resisting delamination and providing long-lasting, reliable corrosion protection.
Excellent chemical resistance
It can provide long-term resistance to corrosion by acids, alkalis, salts, and various industrial corrosive media, making it suitable for complex underground installation conditions and chemical production environments.
Wide operating temperature range
The standard operating temperature range is −30°C to 100°C; the high‑temperature custom version withstands temperatures of 150–180°C, meeting the requirements of the vast majority of industrial piping applications.
Safe and environmentally friendly; raw materials are non-toxic.
All raw materials comply with food-grade safety standards, are suitable for potable water distribution pipelines, and will not contaminate the conveyed fluid.

Three Major Grades of FBE Coatings

Standard Fusion-Bonded Epoxy Powder
Coating thickness: 100–150 μm; adhesion: ≥7 MPa; impact resistance: ≥3 J; suitable for low‑load, conventional underground pipelines.
Thick-film fusion-bonded epoxy
Coating thickness: 200–400 μm; adhesion: ≥6 MPa; impact resistance: ≥5 J. Specifically designed for pipeline systems subjected to high mechanical loads.
High-Temperature-Resistant Fusion-Bonded Epoxy
Long-term temperature resistance of 150–180°C; after a 168-hour thermal aging test at 180°C, the coating shows no cracking, making it suitable for high-temperature fluid transport pipelines.
The appropriate coating grade can be selected based on actual operating conditions, striking a balance between corrosion protection performance and project cost.

Core Production Process Quality Control Standards

Preheating Temperature Control
Adjust the heating temperature according to the powder’s gelation rate: for short‑gelation powders, 180–220°C; for long‑gelation powders, 200–220°C.
Temperatures that are too low can result in insufficient powder melting, leading to a matte finish and wrinkling; temperatures exceeding 220°C can cause powder carbonization, causing the coating to yellow and become brittle.
Uniform heating requirements
The circumferential and axial temperature differences in the steel pipe are maintained within ±10°C, with temperature control achieved using a multi‑section medium‑frequency induction heating furnace. Excessive temperature differentials can lead to coating defects on the “yin” and “yang” sides: the coating in low‑temperature zones fails to cure fully, while in high‑temperature zones it may undergo carbonization. Throughout the production process, temperature measurements are taken at scheduled intervals, and process parameters are adjusted promptly to ensure consistent and uniform coating quality.

Main application scenarios

Oil and gas gathering and transmission pipelines, urban municipal water supply and drainage networks, and pipelines for transporting chemically corrosive media. With their reliable corrosion protection and high cost-effectiveness, FBE‑coated steel pipes are the preferred primary corrosion‑protection solution for the vast majority of underground pipeline projects.