1. The Inner Epoxy Resin Outer Polyethylene Coated Composite Steel Pipe is a marvel of modern engineering. This steel-plastic composite product boasts unparalleled anti-corrosion properties. It is crafted from meticulously pre-treated steel pipes, serving as the durable base. After heating, the inner surface receives a fusion-bonded epoxy powder coating, while the outer surface is enveloped with a protective polyethylene powder layer.
2. This product is the epitome of excellence in the water conservancy pipeline industry. Its pipe body and socket feature a uniformly consistent anti-corrosion layer performance. The innovative flexible socket seamlessly combines with the anti-corrosion layer, offering not only the industry's superior anti-corrosion method but also the most convenient connection solution available.
| 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: Customizations are available to meet the specific requirements of our esteemed customers.
1. Corrosion resistance
Our pipeline employs high-quality anti-corrosion materials such as polyethylene and epoxy resin. These polymer materials exhibit exceptional corrosion resistance, effectively shielding the pipeline from soil and fluid damage, thereby significantly extending its service life.
2. Excellent hydraulic properties
Boasting a smooth inner wall, our pipes resist scaling and maintain a low coefficient of friction. These non-adhesive surfaces ensure optimal pipeline conveying capacity, while minimizing pressure loss and energy consumption during water transmission.
3. Good hygiene performance
The epoxy resin coating inside the pipeline is designed with a smooth surface that resists scaling. Not only is it safe and hygienic, but it also complies with the stringent GB/T17219 health standards, effectively preventing water contamination.
4. Superior adhesion of coating
Our epoxy resin and polyethylene powder materials, after modification, form a robust chemical bond with the metal, providing strong adhesion. The outer polyethylene layer enhances toughness and impact resistance, protecting against scratches, impacts, and plant root punctures.
5. Long life
Designed for durability, our anti-corrosion steel pipes can operate efficiently for 30 to 50 years under normal construction and use conditions, substantially outlasting standard steel pipes.
6. Good connection security
Offering a variety of connection methods to suit diverse environments and pressure requirements, our pipes can be connected via flanging, quick coupling, butt welding, stainless steel lining, socket connections, and more. Each connection method is tried, tested, and reliable.
1. The final quality level of the product depends on the process design and manufacturing process. Donghong, equipped with state-of-the-art technology and machinery, ensures meticulous quality control at every step. Leveraging years of manufacturing expertise, we deliver superior-quality products, establishing ourselves as a trustworthy enterprise committed to excellence.
In response to the increasing demand for large-diameter pipelines, Donghong now offers large-diameter anticorrosion steel pipes that meet international standards. These first-class products are designed to withstand the rigors of demanding applications.
2. To address the diverse needs of various projects, Donghong has innovated a range of connection methods for large-diameter anticorrosive steel pipes. These include flexible socket connections, butt welding, socket lap welding, ball lap welds, customized bevel forms, and more, providing project-specific solutions. Donghong pioneered the large-diameter socket flexible connection in the industry, with sockets reaching up to 1.8M in diameter. These innovative connections are already in use in critical water conservancy projects across China, cementing our position as leaders in large-diameter steel pipe socket connections.
Donghong hosts a dedicated factory for large-diameter, high-pressure pipe fittings, producing fittings tailored for various project needs. Additionally, we offer customization services to create specialized pipe fittings that meet specific customer requirements and project environments.
Other connection methods.
| Socket type connection |
Flange Connection |
Clamp Connection |
About us
Donghong (Shandong Donghong Pipe Industry Co., Ltd.) (abbreviation: Donghong, stock code: 603856) is headquartered in the historic hometown of Confucius - Qufu, China. Established in 1997, Donghong stands out as a premier manufacturer of engineering pipelines, a comprehensive service provider, and a general contractor in pipeline engineering. Our primary business spans across four major categories of functional and customized pipelines: rainwater and sewage drainage pipes, municipal pipelines, industrial and mining pipelines, and pipelines designed for national key projects. On November 6, 2017, we proudly became the first main board listed engineering composite pipeline manufacturer in China, with our shares traded on the Shanghai Stock Exchange.
Donghong boasts a robust R&D team of over 200 professionals and holds more than 100 patents. Leveraging prestigious national platforms such as the National Enterprise Technology Center, the National CNAS Laboratory, an academician expert workstation, and a postdoctoral workstation, we are at the forefront of digital, informational, and intelligent pipeline engineering research. Our dedication positions us as a leader in the evolution of the engineering pipeline industry.
We are deeply committed to advancing national key strategic and livelihood projects. Our expertise has been pivotal in major initiatives such as the South-to-North Water Diversion, Hanjinwei, Beijing-Xinjiang Expressway, and the One Belt, One Road initiative. Additionally, we contribute significantly to standardized farmland development, urban-rural water supply integration, Liren gas projects, centralized heating systems, and more, solidifying our role as an industry leader in engineering pipeline solutions.
Donghong has established strategic partnerships with over five 5A-level logistics companies, leveraging our extensive experience in transportation across various modes-automobile, railway, port, and shipping logistics. Regardless of extreme heat, bitter cold, or challenging and remote locations, we guarantee impeccable service. Our robust transportation strategy ensures that every shipment is promptly delivered to your site, providing unparalleled reliability and efficiency.
1. Does your product comply with international standards?
Our products have successfully passed CE, BV, ISO, and WARS certifications, showcasing superior performance beyond standard requirements. Feel free to inform us of the specific national standard you need, and we will verify or test it accordingly.
2. What services do you offer?
As a manufacturing factory, we provide high-quality pipe products, pipe fittings, packaging, and shipping. As a professional consultation company, we offer expert project consulting advice, comprehensive pipe system solutions, and innovative design suggestions. Being an engineering-focused enterprise, we also offer pipeline contracting services, pipe repair services, and free maintenance guidance.
3. Do you offer OEM/ODM services?
Yes, we provide extensive customization options for materials, specifications, logos, packaging, connection methods, and more. Our experienced team can also offer tailored solutions for your specific projects. We have numerous successful cases of providing these services.
4. What are your payment terms?
We accept T/T or L/C at sight.
5. How do you ensure the quality of your products?
We warmly invite all customers to visit our company and inspect our products in person. We can also conduct stringent tests as per customer requirements before order placement. Additionally, we can dispatch samples prior to bulk production for customers to conduct their own quality tests.
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