Our Inner Epoxy Resin Outer Polyethylene Coated Composite Steel Pipe represents the pinnacle of innovation in anti-corrosive technology. This remarkable steel-plastic composite product is engineered with precision, utilizing a pre-treated steel pipe as its core. The inner surface is expertly coated with a fusion bonded epoxy powder, ensuring robust protection against corrosion. Meanwhile, the outer layer is enveloped in a high-quality polyethylene powder, providing an additional shield of durability and performance. Experience the perfect blend of strength and resilience with our cutting-edge solution.
| Nominal Diameter/ mm |
Inner Coating Layer /mm |
Outer coating layer,mm |
| Ordinary level |
Strengthen level |
| DN ≤65 |
>0.3 |
>0.6 |
>0.8 |
| 65≤DN≤150 |
>0.35 |
>0.8 |
>1.0 |
| 150≤DN≤300 |
>0.35 |
>0.8 |
>1.2 |
| 300≤DN≤800 |
>0.4 |
>1.0 |
>1.3 |
| 800≤DN≤1200 |
>0.45 |
>1.2 |
>1.8 |
| 1200≤DN≤4000 |
>0.45 |
>1.5 |
>1.8 |
Note: Can be customized to meet your specific requirements, ensuring a perfect fit for any application.
1. Corrosion Resistance
Crafted with anti-corrosion materials such as polyethylene and epoxy resin, these superior polymer materials exhibit unparalleled resistance to corrosion. They effectively shield the pipeline from soil and fluid damage, thereby dramatically extending its service life.
2. Excellent Hydraulic Properties
Featuring a brilliantly smooth inner wall, our pipes resist scaling with a low friction coefficient. The smooth, non-stick surface ensures optimal pipeline conveying capacity while minimizing pressure loss and reducing energy consumption during water transmission.
3. Good Hygiene Performance
The epoxy resin coating provides a smooth, hygienic surface that resists scaling, ensuring safety and meeting GB/T17219 health standards. This effectively prevents contamination of water quality by the pipeline.
4. Superior Adhesion of Coating
Our advanced formulation combines modified epoxy resin and polyethylene powder to form a robust chemical bond with metal surfaces, ensuring strong adhesion. The tough outer polyethylene layer offers excellent impact resistance, guarding against scratches from dragging or knocking, and it effectively withstands plant root penetration.
5. Long Life
Engineered for longevity, these anti-corrosion steel pipes boast a remarkable usage span of 30 to 50 years under normal construction and usage conditions, significantly surpassing the lifespan of conventional steel pipes.
6. Good Connection Security
Offering an array of connection methods to suit varied environments and pressure needs, our pipes can be flanged, quick-coupled, butt-welded, stainless steel lined, or socket connected. Each connection method is mature, reliable, and designed for secure operation.
1. At Shandong Donghong Pipe Industry Co., Ltd., we believe the excellence of our Spiral Welded Steel Pipe rests on meticulous process design and precision manufacturing. Leveraging state-of-the-art equipment and years of seasoned expertise, we ensure superior quality control in every key process. This commitment enables us to deliver products of unparalleled quality, earning us the trust and confidence of our esteemed clientele.
To meet the surging demand for robust large-diameter pipelines, Donghong introduces its large-diameter anticorrosion steel pipes, crafted to meet top international standards. These first-class products are a testament to our dedication to innovation and quality.
2. Recognizing the diverse needs of various projects, Donghong has ingeniously engineered multiple connection methods for large-diameter anticorrosive steel pipes. Our offerings include flexible socket connections, butt welding, socket lap welds, ball lap welds, custom bevels, and more. Notably, we pioneered the large-diameter socket flexible connection, boasting a maximum socket caliber of 1.8M. This groundbreaking innovation has already been implemented in major Chinese water conservancy projects, establishing Donghong as the forerunner and leader in the domain of large-diameter steel pipe socket connections.
Donghong also takes pride in its expansive high-pressure pipe fittings factory, specializing in the production of large-diameter, high-pressure pipe fittings tailored for various projects. We offer bespoke solutions, customizing pipe fittings according to specific customer requirements and project environments, ensuring that each need is met with precision and excellence.
Explore our diverse range of connection methods to discover the perfect fit for your project needs.
| Socket type connection |
Flange Connection |
Clamp Connection |
About us
Donghong (Shandong Donghong Pipe Industry Co., Ltd.) (abbreviation: Donghong, stock code: 603856), proudly headquartered in the historic and cultural cradle of Confucius' birthplace - Qufu, China, was founded in 1997. We are a premier manufacturer and comprehensive service provider in the realm of engineering pipelines, boasting a formidable position as a general contractor for pipeline engineering projects. Our expertise spans four pivotal pipeline categories, which include rainwater and sewage drainage pipes, municipal pipelines, industrial and mining pipelines, and pipelines designated for national key projects-each playing a critical role in our main business operations. On November 6, 2017, Donghong achieved a milestone by being listed on the main board of Shanghai, marking its distinction as China's inaugural main board-listed engineering composite pipeline manufacturer, a testament to our industry leadership.
Donghong stands at the forefront of innovation with a robust team of over 200 R&D specialists and a portfolio of more than 100 patents. Our cutting-edge research is propelled by prestigious national platforms such as the National Enterprise Technology Center, the National CNAS Laboratory, an Academician Expert Workstation, and a Postdoctoral Workstation. These platforms drive our relentless pursuit of advancements in the digitalization, informatization, and intelligence of pipeline engineering, positioning Donghong as a leader in the evolution of the engineering pipeline industry.
Pioneering national key strategic and livelihood projects, Donghong consistently leads the engineering pipeline industry. We proudly contribute to transformative national initiatives such as the South-to-North Water Diversion, Hanjinwei, Beijing-Xinjiang Expressway, and the ambitious One Belt, One Road project. Our expertise extends to the development of standardized farmland, the integration of urban and rural water supply systems, Liren gas projects, and centralized heating facilities, reinforcing our commitment to national growth and modernization.
Donghong has forged robust strategic alliances with over five elite 5A-level logistics companies, backed by our extensive expertise in transportation logistics. Whether through efficient road networks, reliable railroad connections, or seamless port and maritime logistics, we guarantee exceptional service delivery. Be it under scorching summer suns or biting winter chills, in bustling cities or in remote, challenging terrains, our comprehensive and adaptive transportation strategy ensures that each shipment reaches your doorstep promptly and in perfect condition. Trust Donghong to deliver excellence, every time.
1. Is your product meets the international standard ?
Our products have pass CE, BV, ISO and wars certificate, and all figures indicates higher than standard, you can feel free to let us know which national standard you required, we will check or test it for you.
2. What kind of service do you offer ?
As a manufacture fatory, we provide pipe products, pipe fittings, package and shipping; as a professional consulation company we provide project consulting advise, pipe system solutions and design suggestions; as an engineering focused enterprise , we also provide pipeline contractor service and pipe repair service, also can give free maintance guidance.
3. Do you support OEM/ODM service?
Yes, we offer customization in material, specification, logo, package , connection methods andothers. Meanwhile, our professional team can offer solution suggestion for your specified projects, we have successfull cases of that service.
4. What's your terms of payment?
T/T or L/C at sight.
5. How can you gurantee the goods you offered is qualified?
We warmly welcome all customers arrange the visit to our company and see our goods in sight, we can also provide strict test as per customer required before order. Meanwhile, before the bulk production, we can dispatch samples for customer to do their own tests to qualify the products.
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