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Epoxy Coated Steel Pipe - Fusion Bonded Epoxy (FBE) Internal Lining for Potable Water & Anti-Corrosion Pipeline

Close-up of epoxy coating cross-section on steel pipe - uniform film thickness and strong adhesion to substrate

Fusion Bonded Epoxy (FBE) coating application - electrostatic spray of epoxy powder cured at high temperature

Smooth internal epoxy lining on steel pipe - food-grade coating for potable water with low friction factor

External epoxy coating on steel pipe - heavy-duty anti-corrosion layer for underground and marine environment

Epoxy Coated Pipe

Keywords: FBE (Fusion Bond Epoxy) Coated Pipe, Epoxy Coated Carbon Steel Pipe

Size: OD: 219mm~2020mm;WT: 5mm~25mm; LENGTH: 4mtr, 6mtr, 12mtr, 18mtr, 21mtr

Standard & Grade : DIN 30670, DIN 30671, DIN 30678, SY/T0413-2002 etc
Ends: Plain End/Bevelled End, Burr Removed

Packing: Waterproof Paper wrapped, Steel Strips bundled, two tags on each bundle
Usage: Used for natural gas, petroleum, water & sewage, and pipe systems


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Epoxy Coated Steel Pipe is a carbon or alloy steel pipe that has been coated internally and/or externally with a thermosetting epoxy powder through an electrostatic spraying and high-temperature curing process. The coating forms a hard, continuous, non-porous protective layer that provides superior resistance to corrosion, chemicals, abrasion, and cathodic disbondment. It is widely used as an alternative to traditional anti-corrosion coatings such as 3LPE, 3LPP, and FBE, offering excellent adhesion and a smooth internal surface for improved flow characteristics.

Key Advantages

Advantage	Description
Superior Corrosion Resistance	Epoxy barrier prevents electrochemical corrosion from soil, water, acids, and salts; outperforms galvanized coatings in aggressive environments.
Abrasion Resistance	Hard, smooth epoxy surface withstands slurry erosion and particulate wear in mining and wastewater applications.
Chemical Resistance	Resistant to a broad range of chemicals including hydrocarbons, solvents, alkalis, and mild acids.
Low Friction Coefficient	Smooth internal surface reduces pumping energy and prevents scale buildup; improves flow efficiency by up to 15%.
High Adhesion & Cohesion	FBE coating achieves >15 MPa bond strength to steel substrate; resists cathodic disbondment.
Temperature Stability	Operating range: -30°C to +110°C (-22°F to +230°F) for standard FBE; high-temperature grades available up to +150°C.
Environmentally Friendly	Solvent-free FBE application emits zero VOCs; compliant with EPA and EU environmental regulations.
Cost Efficiency	Lower lifecycle cost vs. stainless steel or uncoated pipe; minimal maintenance and extended replacement intervals.

Application Scenarios

Industry	Typical Use Case	Coating Type
Oil & Gas	Crude oil, natural gas, and refined product pipelines	FBE (external) + internal liquid epoxy
Water & Wastewater	Potable water transmission, sewage force mains, stormwater drainage	Internal + external liquid epoxy
Chemical Processing	Acid/alkali transport, process piping in refineries	High-build liquid epoxy or phenolic epoxy
Fire Protection	Sprinkler systems, fire water mains	Red epoxy coating (UL/FM listed)
Marine & Offshore	Subsea pipelines, platform risers, ballast lines	3LPE/FBE dual-layer systems
Mining & Slurry	Tailings transport, abrasive slurry pipelines	Abrasion-resistant epoxy (ARO)
Power Generation	Cooling water systems, ash slurry lines	Internal/external epoxy lining

Standard:
DIN 30670: Polyethylene coatings of steel pipes adn fittings.
DIN 30678: Polythylene coatiing of steel pipes and fittings.
SY/T0413-2002: Technical standard of polythelene coating for buried steel pipeline.

Types of anti-corrosion coating

Pipe corrosion types are divided into external corrosion and internal corrosion.

FBE-Coated-Steel-Pipe

1. FBE anticorrosive epoxy powder
FBE epoxy powder preservative structure: electrostatic spraying epoxy powder coating on the pipe surface, a film. The coating has a coating operation is simple, clean, good impact resistance and flexural properties of the coating, temperature resistance advantages.

2PE-3PE-corrosion-coated-steel-pipe

2. 2PE/3PE corrosion
2PE/3PE corrosion structure: the steel surface electrostatic spraying epoxy powder and binder twine lateral lateral wound polyethylene coating, combined with three excellent performance, thereby significantly improving the overall quality of corrosion of the pipe. Resistant to chemical corrosion, cathodic stripping, resistance to mechanical damage performance.

Coal-tar-epoxy-coated-steel-pipe

3. Coal tar epoxy
Coal tar epoxy structure: epoxy resin + filler made of coal tar pitch anticorrosive coating on the steel surface coated glass fabric as reinforcement corrosion layer formation, commonly used in the pipe wall corrosion. thickness of 0.5 ~ 1.0mm.

Parameter	Details
Product Name	Epoxy Coated Steel Pipe / FBE Coated Steel Pipe
Base Material	Carbon Steel / Alloy Steel / Mild Steel
Steel Grades	API 5L Gr.B, X42, X46, X52, X60, X65, X70 (PSL1/PSL2); ASTM A53 Gr.A/B, A106 Gr.B/C; EN S235, S275, S355, L245, L290, L360, L415; GB/T 9711 L245, L290, L360, L415
Pipe Types	LSAW, SSAW, ERW, Seamless
Outside Diameter (OD)	21.3 mm – 3000 mm (½″ – 118″)
Wall Thickness (WT)	2.0 mm – 50 mm (SCH10 ~ SCH160, STD, XS, XXS)
Length	5 m – 14 m (standard); Custom lengths 0.5–18 m available
End Finish	Plain Ends, Beveled Ends, Threaded with Couplings, Plastic Caps
Coating Type	Single-layer FBE (350–500 µm); Dual-layer FBE / ARO (600–1000 µm); 3LPE / 3LPP (FBE primer + adhesive + PE/PP topcoat)
Coating Thickness	FBE: 125–500 µm; 3LPE/3LPP: 2.0–4.5 mm (customizable)
Coating Color	Green (standard), Sage Green, Blue-Green
Operating Temperature	-30°C to 80°C (continuous); Up to 110°C for 3LPP systems
Density	1.2–1.8 g/cm³
Storage Condition	Below 27°C (80°F) and 65% relative humidity (12 months shelf life)

Quality Testing & Inspection:

Coating Thickness Measurement: Magnetic induction or ultrasonic gauges
Holiday/Leak Detection (Spark Test): 5–15 kV voltage depending on coating thickness; no leakage points permitted
Adhesion Test: Cross-cut or pull-off test (≥10 MPa)
Cathodic Disbondment Test: Per ASTM G8 or NACE TM0186
Impact Test: Per ASTM G14 at 23°C and -30°C
Hydrostatic Test: Minimum test pressure 600 psi for NPS ≤4″
Hardness Testing: Per ASTM D2240 (Shore D)

One Layer / Double Layer FBE anti-corrosive coating powder (200um~800um)

3PP (Polypropylene) Coated Steel Pipe
DIN30678 standard technical specification for polypropylene coating for steel pipe and pipe fittings

3PP Coating Advantages:
The 3PP coated steel pipe refers to steel tubing with three layers of PP(Polypropylene) coating. It offers high electric strength, acid resistance, alkali resistance, salt-tolerance, electric insulation, long service life, thermal endurance and impact resistance. Because of advanced steel pipe coating technology, this type of plastic coated steel pipe features well-bonded coatings.

3PP Coating Applications:

The 3PP coating steel pipe is suitable for transferring special materials, such as high temperature materials, because it offers high electric strength, acid resistance, alkali resistance, salt-tolerance, electric insulation, long service life, thermal endurance and is impact resistant.

FBE-Coated-Steel-Pipe

FBE Coated Steel Pipe

FBE coating pipe is Fusion Bonded Epoxy coating steel pipe. It is an externally applied heat resin for pipe. With a form of dry powder at thickness 300-600 microns on to the heated surface of pipe. Once the FBE coated on the pipe surface, the FBE film provides an extremely hard surface with great adhesion to the pipe surface. The FBE layer in a even form and have good resistance to the chemical reaction.

Polyurethane-Insulation-Coated-Steel-Pipe

Polyurethane Insulation Coating Steel Pipe
The polyurethane direct buried heat preservation pipe is a direct buried preheating heat preservation pipe with good heat preservation performance, safety and reliability, and low engineering cost. The buried thermal insulation pipe not only has the advanced technology and practical performance that is difficult to compare with the traditional trench and overhead laying pipeline, but also has obvious social and economic benefits, and is also a powerful measure for heating and energy saving.
It is characterized by a multi-purpose use to prevent the spread of fire and good fire safety performance. Black jacket insulation pipe includes spiral steel pipe, straight seam steel pipe and seamless steel pipe. The outer layer is made of black polyethylene and is called a black jacket insulation tube.
coated-steel-pipe

What is epoxy coated steel pipe?

Epoxy coated steel pipe is a carbon or alloy steel pipe that has been coated internally and/or externally with a thermosetting epoxy powder through an electrostatic spraying and high-temperature curing process. The coating forms a hard, continuous, non-porous protective layer that provides superior resistance to corrosion, chemicals, abrasion, and cathodic disbondment. It is widely used as an alternative to traditional anti-corrosion coatings such as 3LPE, 3LPP, and FBE, offering excellent adhesion and a smooth internal surface for improved flow characteristics.

What is the difference between epoxy coating and FBE coating?

FBE (Fusion Bonded Epoxy) is a specific type of epoxy coating where the dry epoxy powder is electrostatically applied to a preheated steel surface, then melts, flows, and chemically bonds (fuses) to form a continuous protective film. General "epoxy coating" may include solvent-based liquid epoxies (paint) applied by brushing or spraying. FBE is superior because it is solvent-free, eliminating shrinkage defects due to solvent evaporation, resulting in a denser, more durable film with significantly lower porosity. FBE also offers stronger adhesion to steel (≥10 MPa pull-off strength) and excellent cathodic disbondment resistance, making it the preferred choice for buried and subsea pipelines.

What is the service life of epoxy coated steel pipe?

With proper design, coating specification, installation, and cathodic protection (CP) where applicable, epoxy coated steel pipes have demonstrated service lives exceeding 50 years in buried and underwater applications. FBE coatings provide a long-term bond that resists disbondment under CP, and the barrier properties of the coating prevent water and oxygen from reaching the steel surface, eliminating corrosion initiation. Laboratory accelerated aging tests (e.g., 30–50 year simulated life) validate this performance.

Can epoxy coated steel pipe be welded? How is the coating protected during welding?

Yes, but precautions are required. For weld joint areas, the coating is removed for a distance of approximately 100–150 mm from the pipe end before coating application (factory-applied "cutback"). After welding and inspection, the bare steel weld zone must be field-coated using compatible repair materials such as:
Liquid epoxy (two-part, ambient-cure)
Heat-shrink sleeves (FBE or epoxy-coated)
Epoxy mastic or tape systems

Proper surface preparation of the weld area (blasting or power tool cleaning to Sa2.5) is critical before field coating application.

How do you ensure the quality of the coating?

We implement a strict Quality Control (QC) process for every batch:
Holiday Detection: We use high-voltage spark testers (typically 3000V–5000V) to detect any pinholes or defects in the coating.
Adhesion Testing: We perform pull-off tests or knife tests to ensure the coating is firmly bonded to the steel.
Thickness Measurement: Magnetic gauges are used to ensure the coating thickness meets the specified requirements (usually 250μm to 500μm).