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DIN30670 anti-corrosion steel pipe is a technical specification for anti-corrosion coating developed according to the German industrial standard DIN30670, mainly used for polyethylene anti-corrosion coating of steel pipelines and fittings. This standard requires the anti-corrosion layer to be composed of an epoxy resin bottom layer, a polyethylene adhesive layer, and a polyethylene outer layer, with anti-corrosion performance, mechanical strength, and chemical corrosion resistance.
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Technical Specification for DIN30670 Anti corrosion Steel Pipe
DIN30670 anti-corrosion steel pipe is a technical specification for anti-corrosion coating developed according to the German industrial standard DIN30670, mainly used for polyethylene anti-corrosion coating of steel pipelines and fittings. This standard requires the anti-corrosion layer to be composed of an epoxy resin bottom layer, a polyethylene adhesive layer, and a polyethylene outer layer, with anti-corrosion performance, mechanical strength, and chemical corrosion resistance. The standard clearly specifies key indicators such as surface treatment, anti-corrosion layer thickness, cathodic peeling test, impact strength, etc., and verifies long-term stability through thermal aging tests, UV resistance tests, etc.
Product type and structural characteristics
DIN30670 anti-corrosion steel pipes are mainly divided into a three-layer polyethylene (3PE) anti-corrosion structure, including an epoxy powder bottom layer, an adhesive middle layer, and a high-density polyethylene outer layer. Some products adopt a dual anti-corrosion process, such as a 3PE anti-corrosion layer on the outer wall and a fusion bonded epoxy powder (FBE) coating on the inner wall, forming TPEP composite steel pipes. This structure combines high impermeability and corrosion resistance, suitable for buried or underwater environments, and can be used for up to 30-50 years.
Application Fields and Industry Requirements
This type of steel pipe is widely used in fields such as oil and gas transportation, urban water supply, thermal pipelines, chemical pipelines, and marine engineering. For example, in long-distance natural gas pipelines, 3PE anti-corrosion coatings can resist soil corrosion and mechanical stress; In the transportation of drinking water, the epoxy coating on the inner wall meets food hygiene standards. In addition, its low-temperature impact resistance (-40 ℃ to 90 ℃) makes it suitable for cold regions and working environments with large temperature differences.
Production process and quality control
The production process includes key processes such as sandblasting and rust removal (Sa2.5 grade) on the surface of steel pipes, electrostatic spraying of epoxy powder, extrusion coating of adhesives, and wrapping of polyethylene layers. Enterprises need to verify the adhesion of epoxy layer through cathodic stripping test and test the stability of polyethylene material through melt mass flow rate (MFR). Some manufacturers use double-sided submerged arc welded spiral steel pipes or straight seam welded pipes as substrates, and cooperate with automated production lines to achieve uniform control of the thickness of the anti-corrosion layer (usually 1.8-3.7mm).
Quality inspection and compliance with standards
According to the DIN30670 standard, the testing items include measuring the thickness of the anti-corrosion layer (Appendix A), cathodic peel test (Appendix C), peel strength test (Appendix D), etc. For example, cathodic stripping test requires the sample to be exposed to a polarization potential of 1.5V for 28 days, with a stripping radius of ≤ 15mm; The curing degree of epoxy resin needs to be determined by DSC method and fully crosslinked. Enterprises also need to provide third-party testing reports to verify performance indicators such as UV aging resistance and chemical corrosion resistance.
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