Need standard ductile iron pipes conforming to ISO 2531, EN 545 & EN 598 for water systems and infrastructure construction?
Direct factory competitive prices
Full range DN80 – DN800 specifications
Efficient worldwide delivery
MTC documents supplied, third-party inspection acceptable
Royal Steel Group ranks among China’s premier suppliers of premium ductile iron pipes. Our products strictly conform to ISO 2531, EN 545 and EN 598 specifications.
Ductile Cast Iron Pipes feature outstanding mechanical strength, reliable anti-corrosion performance and extended service lifespan. They are widely deployed for municipal water supply, sewage conveyance, farmland irrigation, fire protection networks and industrial pipeline projects.
We offer nominal diameters spanning DN80 to DN2600, supported by more than 50 wall thickness options including K7, K8, K9, C and M grades. A full selection of protection solutions can be provided, such as cement mortar lining and galvanized coatings. Customised solutions are also offered to accommodate diverse operating conditions.
| Item | Specification |
| Product Name | Ductile Iron Pipeline for Water Supply |
| Standards | Manufactured in accordance with ISO 2531, EN 545 and EN 598 international norms |
| Material Grade | EN-GJS-500-7 (also known as GGG50) |
| Pipe Classes | K9, C25, C30, C40 |
| Nominal Diameter | DN80 up to DN800 |
| Available Length | Standard lengths: 5.7m & 6m; bespoke sizes on request |
| Pressure Class | PN10, PN16, PN25, PN40 |
| Connection Types | T-type joint, K-type joint, flanged connection |
| Production Technology | Centrifugal casting technique |
| Place of Origin | China |
The dimensions below comply with major international standards (including ISO 2531, EN 545, EN 598, and ASTM requirements). Standard wall thickness classes (such as K9, C40, Sch40) and customized lengths are available upon request.
| Nominal Size (DN) | Nominal Size (Inch) | Outside Diameter (OD - mm) | Standard Length (m) | Joint Type Options |
| DN80 | 3" | 98 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN100 | 4" | 118 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN150 | 6" | 170 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN200 | 8" | 222 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN250 | 10" | 274 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN300 | 12" | 326 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN400 | 16" | 429 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN500 | 20" | 532 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN600 | 24" | 635 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN700 | 28" | 738 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| DN800 | 32" | 842 | 5.8 / 6.0 | T-Type / Flanged / Restrained |
| Property | Value |
| Tensile Strength | ≥ 420 MPa |
| Yield Strength | ≥ 300 MPa |
| Elongation | ≥ 10% |
| Hardness | ≤ 230 HB |
Royal Steel Group -Ductile Iron Pipe Manufacturer China can provide customized quotations based on your project specifications.
✔ Water Supply Projects
✔ Sewage & Wastewater Systems
✔ Irrigation Networks
✔ Municipal Infrastructure Projects
Internal Lining Options
Portland Cement Mortar Lining
Sulphate Resistant Cement Coating
Ceramic Epoxy Coating
Polyurethane Protective Lining
External Protective Coatings
Zinc Coating topped with Bitumen
Zinc-Aluminium Alloy Coating
Epoxy Protective Coating
Polyurethane Coating
High Mechanical Strength
Every high-tensile forged component we supply is precision processed using top-grade domestic carbon steel and stainless steel round bars. We never compromise on raw material standards.
Superior Corrosion Resistance
Two mature galvanising treatments are available to achieve robust long-term anti-corrosion performance: hot-dip galvanising by immersion in molten zinc, and electro-galvanising. Both options provide reliable lasting protection. Further coating with paint can additionally elevate anti-corrosion effects.
Leak-Free Joint System
Our flexible push-in joints ensure consistently tight sealing. This design greatly speeds up on-site installation while enhancing overall stability of the pipeline system over decades of operation.
Ultra-Long Service Lifespan
Designed for heavy-load infrastructure applications, our products can remain operational for more than 50 years with little routine maintenance needed. This brings remarkable cost advantages for long-term municipal engineering projects.
Full Compliance with International Standards
Production strictly follows ISO 2531, EN 545 and EN 598 specifications. Our products satisfy global technical requirements for municipal potable water and sewage infrastructure schemes.
1. Raw Material & Melting
Premium iron raw materials are melted with strict chemical monitoring. This steady chemical base delivers consistent composition and dependable mechanical performance.
2. Centrifugal Casting
We form ductile iron pipes using centrifugal casting techniques. The process creates evenly distributed wall thickness, enhanced structural strength and precise dimensional tolerances.
3. Heat Treatment
Controlled heat treatment elevates the pipes’ strength and toughness, optimising overall performance to comply with international industry specifications.
4. Quality Testing
Every finished pipe is subject to hydrostatic pressure testing and dimensional verification, guaranteeing safe and reliable operation on site.
5. Internal & External Anti-Corrosion Protection
Internal cement mortar lining paired with external zinc spray plus bitumen or epoxy coatings offers robust corrosion resistance and prolongs operational service life.
6. Packaging & Shipment
All pipes receive sturdy protective packaging. We offer professional export arrangements for deliveries to destinations across the globe.
Over 10 years of steel export experience
Factory-direct pricing
Full range of DN80-DN800 Ductile Steel Iron Pipe
Strict ISO quality control system
Fast production and global delivery
OEM and customized solutions available
SGS, BV, and third-party inspection support
Complete export documentation service
All pipes are firmly fastened using steel binding straps and timber supports. Protective end caps are fitted to both ends to guard against any damage while in transit.
Available shipping solutions:
20GP & 40GP full container loads
Break bulk shipment
Bulk carrier transport
We export our products widely to North America, Mexico, Central & South America, Southeast Asia, the Middle East and Africa.
Q1: What standards do your ductile iron pipes comply with?
A: All our Ductile Iron Pipe and Fittings are produced in strict accordance with ISO 2531, EN 545 and EN 598 international standards. Our products fully satisfy the technical criteria for municipal water supply and sewage infrastructure projects across global markets.
Q2: What pipe classes are available?
A: We stock a complete selection of pipe classes to suit varying project pressure and load conditions. Our available grades cover K9, C25, C30 and C40, allowing flexible matching for different on-site working scenarios.
Q3: Can you provide third-party inspection?
A: Yes, third-party inspection is fully supported. We accept independent inspections from internationally authoritative bodies such as SGS, BV and TUV. Relevant official inspection documents can be issued according to client requirements.
Q4: What coating options can be supplied?
A: We offer a wide range of internal and external coating solutions to adapt to diverse usage environments. Available finishes include traditional zinc plus bitumen coating, zinc-aluminum alloy coating, epoxy coating and polyurethane coating for superior anti-corrosion performance.
Q5: Can customized lengths be manufactured?
A: Customized production is fully accessible. Aside from standard pipe lengths, we can fabricate non-standard sizes and tailor-made products based on clients’ drawings and technical specifications to fit unique project demands.
Q6: What documents can you provide?
A: We are able to supply a full set of official export documents for customs clearance and project filing, including Material Test Certificates (MTC), third-party inspection reports, packing lists, commercial invoices and certificates of origin. All paperwork can be adjusted to meet local clearance rules.
ROYAL GROUP
Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
Monday-Sunday: 24-hour Service
