Product Description

Manufactured by applying thermosetting or thermoplastic powder (polyethylene PE or epoxy EP) onto the internal and/or external surface of steel pipe through electrostatic spraying, fluidized bed, or extrusion processes, followed by heat curing. Features excellent corrosion resistance, good chemical resistance, smooth inner surface for low friction, and strong adhesion. Base pipe materials: carbon steel (Q235B, Q355B, API 5L Gr B, ASTM A106), galvanized steel, or stainless steel. Pipe outer diameter: 20mm – 1620mm. Wall thickness: 1.5mm – 40mm. Standard length: 6m, 12m (custom). Coating types: polyethylene (PE) for external anti-corrosion; epoxy (EP) for internal lining (drinking water, chemical resistance); or dual coating inside and out. Coating thickness: internal EP 250-500µm; external PE 0.5-3.0mm. Coating color: blue, black, white, grey, green, or custom. End treatment: plain or flanged, with coating removed 20-50mm from ends for welding. Service temperature: EP coated -30°C to +100°C; PE coated -40°C to +80°C. Holiday test: 1.5-4kV spark test. Meets DIN 30670, AWWA C213, GB/T 28897, or SY/T 0413 standards. Custom coatings, colors, and lengths available.

Parameter

Product Name	Plastic Coated Steel Pipe (Internal/External Coating)
Base Pipe Materials	Carbon steel: Q235B, Q355B, API 5L Gr B, ASTM A106 Gr B; galvanized steel; stainless steel (304/316L)
Base Pipe Type	Seamless, ERW, LSAW, SSAW, or welded
Pipe Outer Diameter	20 mm – 1620 mm (0.79" – 64")
Wall Thickness	1.5 mm – 40 mm (depending on diameter and grade)
Standard Length	6 m, 12 m (custom up to 18 m)
Coating Types	Internal: Epoxy (EP); External: Polyethylene (PE); Dual (internal EP + external PE)
Coating Location	Internal lining, external coating, or both sides
Internal Coating (EP) Thickness	250 – 500 µm (standard 300–400 µm)
External Coating (PE) Thickness	0.5 mm – 3.0 mm (standard 1.5–2.5 mm)
Coating Color (External PE)	Blue, black, white, grey, green, or custom (RAL)
Coating Color (Internal EP)	White, blue, grey, or custom
End Treatment	Plain (coating removed 20–50 mm from ends for welding), flanged, or grooved
Service Temperature	EP: -30°C to +100°C; PE: -40°C to +80°C
Coating Adhesion (EP/steel)	≥ 30 MPa (pull-off) or no detachment after 95°C water immersion
Holiday Test	Spark test: 1.5 – 4 kV (depending on coating thickness), zero porosity
Chemical Resistance (EP)	Excellent resistance to acids, alkalis, salts, solvents, and – for food-grade EP – potable water
Abrasion Resistance (PE)	High, suitable for soil, rock contact, and directional drilling
Surface Preparation	Blast cleaning to Sa 2.5, anchor profile 40–100 µm
Application Method	Internal EP: electrostatic spraying or fluidized bed; External PE: extrusion or spray
Standards Compliance	DIN 30670, AWWA C213, GB/T 28897, SY/T 0413, EN 10289, EN 10290
Custom Options	Coating type (EP, PE, other), thickness, color, cut-back length, food-grade certification

Application description

Widely used in drinking water supply systems, fire sprinkler lines, chemical process piping, wastewater treatment, and underground utility pipelines. Also suitable for food and pharmaceutical processing (food-grade epoxy lining), electrical conduit, gas distribution, and district heating/cooling systems. The smooth internal coating reduces friction and prevents scaling; the external PE coating provides corrosion protection in buried or harsh environments.

Production description

Steel pipe is shot blasted to Sa 2.5 and preheated. For internal epoxy lining: powder is electrostatically sprayed or fluidized into the pipe then heat cured. For external PE coating: polyethylene is extruded or sprayed onto the pipe. The coated pipe is cooled, tested for porosity (spark test), and ends cut back for field welding.

Shipping Packaging

For export, plastic coated steel pipes are fitted with plastic end caps, bundled with wooden separators and steel straps, packed on ISPM-15 pallets or steel skids, and protected with edge protectors. Coated surfaces may be wrapped with foam or polyethylene film. Labels include base pipe, coating type, dimensions, and heat number for safe sea freight.

Why Choose Us?

1.Factory Strength:Direct manufacturer with shot blasting lines, internal epoxy spraying (electrostatic/fluidized bed), external PE extrusion lines, and heat curing ovens, producing coated steel pipes from 20mm to 1620mm OD to GB/T 28897, DIN 30670, AWWA C213 standards.

2.Quality Assurance:Strict control of coating adhesion (EP ≥30MPa, PE ≥200N/cm), holiday-free (spark test 1.5-4kV), coating thickness uniformity, and chemical resistance; 100% porosity and thickness inspection.

3.Certifications & Reports:Mill test certificates for base pipe and coating materials with each shipment; third-party inspections (SGS, BV) and coating test reports (adhesion, thickness, porosity, salt spray, food-grade certification if applicable) available upon request.

4.Customization & Service:Wide base pipe materials (carbon steel Q235B/Q355B, API 5L, galvanized, stainless steel), diameters 20-1620mm, internal epoxy (250-500µm) and external PE (0.5-3.0mm), optional colors (RAL), food-grade epoxy for potable water, and fast lead times.

5.Export Packaging:Plastic end caps + foam/polyethylene wrapping + wooden separators + steel strapping + ISPM-15 pallets/steel skids + edge protectors + clear labeling for safe sea freight and coating protection.

FAQ

1. How to store plastic coated steel pipes to prevent coating damage?

Store on dry, level ground on padded wooden sleepers, keep pipes bundled with soft separators. Avoid rolling or dragging over abrasive surfaces. For outdoor storage, cover with UV-protective tarpaulin. Repair scratches with matching epoxy or polyethylene repair materials before installation.

2. What is the difference between internal epoxy (EP) lining and external polyethylene (PE) coating?

Internal EP lining (250–500µm) provides a smooth, hygienic, corrosion-resistant surface for drinking water, chemicals, or food products, reducing friction and preventing scaling. External PE coating (0.5–3.0mm) offers tough mechanical protection against soil stress, rocks, and moisture, ideal for buried or corrosive external environments. Dual coated pipe (EP inside + PE outside) is recommended for water transmission and underground pipelines.

3. Can plastic coated pipes be welded in the field?

Yes, but the coating must be removed 20–50mm from the weld area (cut-back). Weld using standard procedures for carbon steel. After welding, NDT (if required), clean and apply a field joint coating (heat shrink sleeve or liquid epoxy) matching the original coating system. Do not weld through the coating; it will burn and produce harmful fumes.

CLIENT FEEDBACK

Has a professional foreign trade team and a well-established export service system. We have built long-term and stable cooperation relationships with customers from Southeast Asia, the Middle East, Africa, South America, and other regions.

CUSTOMER VISIT

We sincerely welcome global partners to contact us for mutual growth. With high-quality products and professional service, we look forward to working with you to create a prosperous future together.

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