DIN 30670 is the core technical standard for polyethylene anti-corrosion coatings applied to buried steel pipelines for gas and water supply in Germany. The peel strength test for 3PE coatings under this standard focuses on verifying the adhesion between the coating and the substrate as well as interlayer adhesion. All test operations must strictly comply with the standard clauses to eliminate systematic errors and human interference. Specimen Preparation and Conditioning (Basis for Compliance) Sampling and Cutting Requirements: Specimens shall be taken from the flat straight sections of finished anti-corrosion pipes, at least 50 mm away from pipe ends, circumferential welds and defective areas. Specimens with coating blisters, pinholes or mechanical […]

1. Core Classification and Technical Characteristics of FBE Coating Thickness FBE coatings are categorized into three types based on thickness: Single-Layer Basic Type, Single-Layer Reinforced Type, and Dual-Layer Composite Type, with their performance increasing in a stepped manner as thickness increases: Coating Type Thickness Range Core Characteristics Process Features Single-Layer Basic 300-400 μm Adhesion strength ≥ 5 MPa, salt spray resistance ≥ 3000 hours Single electrostatic spraying, room-temperature curing Single-Layer Reinforced 400-500 μm 40% higher impact resistance, excellent cathodic disbondment performance Thickened spraying + high-temperature curing (230℃) Dual-Layer Composite ≥ 620 μm (base + top) Strong adhesion of base layer, wear/chemical corrosion resistance of top layer Double spraying, layered functional […]

The transportation and storage of Fusion-Bonded Epoxy (FBE)-coated steel pipes are critical links in ensuring their corrosion protection performance. Although FBE coatings exhibit excellent corrosion resistance, they are relatively brittle with poor impact and scratch resistance, and are sensitive to ambient temperature, humidity, and mechanical forces. Therefore, standardized transportation and storage management is essential to prevent coating damage, aging, or structural damage to the pipes, thereby ensuring the effectiveness of subsequent construction and long-term operation. Below are the specific operational specifications: 1. Preparation Before Transportation Before transportation, coating quality verification and protective pre-treatment must be completed to minimize the risk of damage during transportation: 1.1 Coating Quality Re-inspection In accordance with GB/T […]

FBE (Fusion Bonded Epoxy) anti-corrosion steel pipes use steel pipes as the matrix, and the epoxy powder is melted and cured on the surface of the steel pipes through high-temperature spraying to form an anti-corrosion layer. To improve the service life of FBE anti-corrosion steel pipes, efforts can be made in multiple links such as production and manufacturing, transportation and storage, installation and use, and later maintenance: Production and Manufacturing Link Optimize Steel Pipe Pretreatment: The cleanliness and roughness of the steel pipe surface directly affect the adhesion of the FBE coating. Before coating, shot blasting or sandblasting is used to thoroughly remove impurities such as rust, oil stains, and […]

During the heat treatment process of steel pipes, various defects may occur due to improper process parameters, equipment failures, or operational errors. The following is a detailed analysis of common defects and their preventive measures: I. Defects in the Heating Stage Oxidation and DecarburizationDefect manifestation: An oxide scale (Fe₃O₄, Fe₂O₃) forms on the surface of the steel pipe, and the loss of carbon elements leads to a decrease in surface hardness.Cause: Excessive air (oxidizing atmospheres such as O₂, H₂O, etc.) in the heating furnace, too high a heating temperature, or too long a holding time.Preventive measures:Use a controlled atmosphere furnace (such as N₂, Ar protective gas, or drip methanol and […]