I. Product Name:

Technical consultation for 3PE/3LPE three-layer polyethylene anti-corrosion coated steel pipe (3PE Structural Polyethylene Anti-corrosion Coating).

II. Scope of Supply:

Consultation covers the coating structure design, thickness selection, standard matching, construction condition adaptation scheme, and service life assessment of steel pipes covered with a three-layer polyethylene (3PE/3LPE) anti-corrosion coating. Services include: selection of composite structure parameters for the FBE base layer + adhesive intermediate layer + PE outer layer; differentiation between standard and reinforced thicknesses; recommendations for anti-corrosion grades in different soil environments; and interpretation of cathodic disbondment performance.

III. Main Products/Material Brand Range:

Product types: 3PE/3LPE three-layer polyethylene anti-corrosion coated steel pipe, 2PE/2LPE double-layer polyethylene anti-corrosion coated steel pipe.

Coating structure: bottom layer molten epoxy powder (FBE 50–150μm) + middle layer copolymer adhesive (AD 170–250μm) + outer layer high-density polyethylene (PE 1.8–3.7mm).

Implementation standards: GB/T 23257-2017, SY/T 0413-2002, ISO 21809-1, DIN 30670, CSA Z245.21.

Base pipe material: LSAW straight seam submerged arc welded steel pipe (L245–X80 all-steel grade).

Brand: Hebei Haiganwei Steel Pipe Co., Ltd. (HSPC).

IV. Supply Cooperation Forms:

We support custom processing of 3PE anti-corrosion coatings (standard grade/reinforced grade) and can produce according to customer-specified standards (GB/ISO/DIN/CSA).

We support integrated supply of LSAW base pipe and 3PE anti-corrosion coating to reduce cross-plant coordination costs.

We can provide anti-corrosion coating test reports: impact strength test, peel strength test, cathodic disbondment test, and spark leak detection.

Support for export trade: Provide COC, English test reports, and third-party inspection coordination.

V. Online Consultation Channels:

Official website: www.haiqianwei.com / www.hspc.cc

Email: [email protected]

Contact Person: Manager Liu

Landline: 0317-6091369 / 0317-6091368

Online paid consultation platform ($9.9 USD/session).

VI. Detailed Product Specifications:

Parameter 1 (Total Coating Thickness): Standard grade 1.8–3.0 mm / Reinforced grade 3.0–3.7 mm, which can be flexibly selected according to pipe diameter and environmental corrosion level, and meets the thickness classification requirements of GB/T 23257 and ISO 21809.

Parameter 2 (peel strength): ≥100 N/cm at room temperature, ≥70 N/cm at 50℃, ensuring a strong bond between the coating and the steel pipe surface, preventing interlayer peeling due to stress or temperature changes during operation.

Parameter 3 (cathode peel radius): ≤8–10mm under 65℃/48h conditions, which is far superior to the industry benchmark, ensuring that the coating will not experience large-area peel failure under the long-term action of the cathodic protection system.

VII. Parameter Correspondence and Function Description:

Total coating thickness (standard/reinforced): The three-layer composite structure achieves synergistic protection through the functional division of each layer—the FBE bottom layer provides excellent adhesion and a corrosion-resistant base, blocking moisture and gas penetration; the AD intermediate layer acts as a "bridge" to ensure a tight bond between the three layers and prevent interlayer separation; the PE outer layer provides protection against mechanical damage and chemical corrosion resistance. The reinforced thickness is suitable for highly corrosive soils, high-water-level areas, and marine environments, with a design life of 30–50 years.

Peel strength (≥100N/cm at room temperature, ≥70N/cm at 50℃): High peel strength means that the coating can still maintain a firm bond with the steel pipe surface under conditions such as thermal expansion and contraction of the pipeline, soil settlement and displacement, and collision during construction and handling. It will not expose the bare pipe due to interface detachment, which will lead to local corrosion and perforation. It is the core mechanical indicator to ensure long-term anti-corrosion effect.

Cathodic stripping radius (65℃/48h ≤8–10mm): Cathodic protection is a standard supplementary means of corrosion protection for buried pipelines, but long-term electrochemical polarization can lead to electrochemical stripping at the interface between the coating and the steel pipe. A low cathodic stripping radius indicates that the coating can still maintain its integrity under cathodic protection, preventing the protective current from "escaping" to the exposed interface and causing a decrease in the protective effect. It is a key parameter for measuring the compatibility between the anti-corrosion coating and the cathodic protection system.