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DIN 30678 is a technical standard for polypropylene (PP) coating of steel pipes developed in Germany, mainly used to standardize the quality requirements of polypropylene anti-corrosion coating on the surface of steel pipes in contact with soil or water.
keyword DIN 30678 Category Anti-coating pipe standards Related products Get a quoteDIN 30678 Polypropylene (PP) coated anti-corrosion steel pipe
DIN 30678 is a technical standard for polypropylene (PP) coating of steel pipes developed in Germany, mainly used to standardize the quality requirements of polypropylene anti-corrosion coating on the surface of steel pipes in contact with soil or water. This standard specifies key indicators such as substrate treatment, coating thickness, adhesive strength, and impact strength, and specifies process flows such as sandblasting rust removal, spark testing, and thermal aging performance testing to ensure the long-term stability of coatings in high temperature or harsh environments.
Coating Structure and Technical Characteristics
DIN 30678 anti-corrosion steel pipe adopts a three-layer structure: the bottom layer is epoxy powder (FBE, 50-100 μ m), the middle layer is adhesive (AD, 250-400 μ m), and the outer layer is polypropylene (PP, 1.4-4.0mm). This structure has both chemical and physical protection capabilities, especially suitable for transporting high-temperature media (withstanding temperatures of 110 ℃) or high-temperature sunlight environments such as deserts. Its coating resistivity is ≥ 10 Ω· m, fracture elongation is ≥ 300%, peel strength at 90 ℃ is ≥ 80N/cm, indentation hardness is ≤ 0.3mm, significantly better than the high-temperature performance of traditional 3PE coatings.
Application Fields and Engineering Advantages
This standard anti-corrosion steel pipe is widely used in oil, natural gas, heating, and water supply pipelines, especially in high-temperature conditions or desert areas where it performs outstandingly. For example, it can be used for up to 30 years in an environment of 80 ℃, and can still maintain its protective effect for more than 8 years at 100 ℃. Its ability to resist Cl ⁻ ion corrosion and groundwater chemical erosion gives it significant advantages in underground pipeline engineering. In addition, the coating has been rigorously verified for its long-term reliability through spark testing, impact testing (30 times without breakdown), and other rigorous tests.
Market Status and Production Standards
Domestic enterprises producing DIN 30678 anti-corrosion steel pipes are required to follow the workshop coating process specified in the standard, including sandblasting and rust removal of steel pipes to a cleanliness level of Sa2 half, continuous coating without pinholes, and uncoated areas at the pipe ends of ≤ 150mm. At present, the product has formed a complete specification system from Φ 89mm to Φ 1820mm, with materials including Q235B, X42-X80 grade steel, etc., and has passed ISO9001, API and other certifications. It is exported to Southeast Asian and Middle Eastern markets. In market competition, its high-temperature performance advantage drives it to replace traditional anti-corrosion solutions in the petrochemical and energy fields.
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