Black Bitumen Coated Ductile Iron Pipe Anti-Corrosion Large Diameter Steel Pipe ISO 2531

This product is a high-quality ductile iron pipe manufactured in strict compliance with the international standard ISO 2531. It features a black bitumen coating as an external anti-corrosion solution. Covering a diameter range from DN80 to DN2600, it combines the excellent mechanical properties of ductile iron (high strength, toughness, and pressure resistance) with the exceptional corrosion and wear resistance of bitumen coating. It is an ideal choice for municipal water supply, water conservancy projects, industrial water transmission, and mining fluid transportation, particularly suitable for large-diameter, high-demand buried pipeline projects.

1. Superior Material Base: Ductile Iron
●High Strength and Toughness: Compared to gray cast iron, ductile iron undergoes spheroidization treatment with elements such as magnesium or cerium, giving it strength close to steel while retaining good toughness and elongation. It effectively resists ground settlement, external impact, and pressure fluctuations.
●Excellent Seismic Performance: Its flexible joint design (e.g., K-type, T-type push-in joints) combined with the material's inherent toughness ensures outstanding performance in geological disasters such as earthquakes.
●Long Service Life: The ductile iron material itself is highly durable, with a design service life of over 100 years.

3PE Spiral Steel Pipes Making Process mainly including those steps: bare spiral welded steel pipe->Intermediate frequency preheating->Shot blasting rust removal->Rust removal quality inspection->Intermediate frequency preheating->Powder coating->Adhesive->Polyethylene layer->water cooling->Coating inspection->3PP anti-corrosion pipe storage

●International Standards: Core products are ISO 2531 certified, ensuring reliable quality.
●Comprehensive Protection: The reliable bitumen coating anti-corrosion system adapts to various complex soil environments.
●Complete Specifications: Ultra-wide diameter range from DN80 to DN2600, enabling one-stop procurement.
●Durability: Combining the century-long lifespan of ductile iron with the long-lasting protection of bitumen coating, resulting in low lifecycle costs.

●Municipal Public Engineering: Urban water transmission and distribution mains, fire protection networks.
●Water Conservancy Projects: Pressure pipelines for water diversion, transfer, and irrigation systems.
●Industrial Applications: Power plant circulating water, mining tailings transportation, industrial wastewater pipelines.
●Others: Ventilation pipelines, utility tunnel projects, etc.

Manufacturing Standards: Complies with internationally recognized coating standards such as AWWA C205, ISO 5256, DIN 30671, or other client-specified standards.
Quality Control Checkpoints:
●Steel surface preparation (Blast cleaning to Sa 2.5, anchor profile control).
●Individual coating thickness inspection (using magnetic gauges).
●Holiday (pinhole) detection using high-voltage spark testers.
●Adhesion tests.
●Visual inspection.

At Yuantai Derun, we take pride in delivering premium square steel pipes. To let you experience our excellence firsthand, we’re pleased to provide free samples (up to 20 cm in length), shipped directly to you via express air freight—with only the shipping cost on your end.
Why hesitate? Put our materials to the test and discover why Yuantai Derun stands out in quality and reliability. Request your sample today!

Yuantai Derun Square Steel Pipes – Quality Assured at Every Stage

From raw material sourcing to finished products, Yuantai Derun implements rigorous quality control at every step. We exclusively use traceable raw materials from reputable manufacturers, subjecting them to comprehensive inspections, including but not limited to:

● Dimensional & Visual Checks (appearance, size, straightness)
● Mechanical Testing (impact resistance, yield & tensile strength, hardness)
● Material Analysis (chemical composition, metallographic examination)
● Non-Destructive & Corrosion Testing (UT inspection, salt spray testing)

Contact us today to discuss your specific testing requirements—we ensure precision and reliability in every pipe.