Product Overview
Our GB/T13295 compliant ductile iron pipes are centrifugally cast and designed for pressurized water transmission, including potable water, raw water, and treated sewage. These pipes combine the strength of steel with the corrosion resistance of cast iron, offering a service life of over 50 years under normal operating conditions.
Key Technical Specifications
All pipes are manufactured in accordance with GB/T13295 and ISO 2531, with the following core parameters:
| Parameter | Specification |
|---|---|
| Standard | GB/T13295 / ISO 2531 |
| Nominal Diameter (DN) | DN80 – DN2600 |
| Pressure Classes | K9, K10, K12 |
| Effective Length | 6,000 mm (standard) |
| Joint Type | T‑type push‑on / Self‑anchoring |
| Internal Lining | Cement mortar (factory applied) |
| External Coating | Zinc + epoxy / Polyurethane (optional) |
Mechanical Properties & Dimensions Table
Typical wall thickness and weight for K9 class pipes (GB/T13295) are shown below:
| DN | Outside Diameter (mm) | Wall Thickness K9 (mm) | Weight K9 (kg/m) | Test Pressure (MPa) |
|---|---|---|---|---|
| 100 | 118 | 4.4 | 12.2 | 5.0 |
| 150 | 170 | 4.5 | 17.8 | 4.5 |
| 200 | 222 | 4.7 | 24.0 | 4.0 |
| 300 | 326 | 5.2 | 38.5 | 3.5 |
| 400 | 429 | 5.7 | 55.0 | 3.2 |
| 600 | 635 | 7.1 | 100.0 | 2.8 |
| 800 | 842 | 8.6 | 161.0 | 2.5 |
Joint Performance
The T‑type push‑on joint uses a factory‑installed EPDM gasket conforming to GB/T 13295. It allows angular deflection up to 3°–5° (depending on diameter) and provides a fully leak‑tight seal under both pressure and vacuum conditions.
Corrosion Protection System
External: Minimum 130 g/m² metallic zinc coating + red epoxy topcoat (total dry film thickness ≥ 70 μm) per GB/T 17456.
Internal: High‑alumina cement mortar lining to GB/T 17457, maintaining water quality and preventing tuberculation.
Optional: Polyurethane (PU) coating for aggressive soils or trenchless installation.
Application Fields
Municipal water supply and distribution networks
Long‑distance raw water transmission
Gravity and pressure sewage systems
Industrial water and fire water pipelines
Irrigation and agricultural water projects
Quality Assurance
100% hydrostatic pressure testing on each pipe (≥ 1.5× nominal pressure)
Tensile test: min. 420 MPa strength, min. 10% elongation
Microstructure: ≥ 90% nodularity (ISO 945)
EN 10204 Type 3.1 material certificate supplied with each shipment
Third‑party inspection (SGS, BV, etc.) available upon request
