2 1/2’’ galvanized steel pipe, also known as 2.5 inch galvanized pipe, has a nominal diameter DN65. It is widely used for fluid transmission and steel structure projects. A metallic zinc layer is coated on the pipe surface. The silvery zinc coating greatly improves the oxidation resistance and extends the service life of the steel pipe. The pipe maintains stable performance in dry, humid, and underground environments.
Glory Steel is a professional Chinese manufacturer and one-stop export supplier of 2 1/2’’ galvanized pipe. We mass-produce 2.5-inch galvanized steel pipes in various standards and wall thicknesses, including ERW pipes and seamless pipes. Value-added mechanical processing services are also available.
Specifications
| Item | 2-1/2 Inch Galvanized Pipe |
|---|---|
| Standards | ASTM A53 Gr.B, GB/T 3091, EN 10255 |
| Material Grades | Q235B, Q345B, 20#, ASTM A53 Gr.B, S235JR |
| Anti-corrosion Process | Hot Dip Galvanizing |
| Length | 1-12 meters |
| Wall Thickness Schedule | SCH20, SCH40, SCH80 |
| MOQ | 10 Tons |
| Packaging | Hexagonal Bundle Packing |
Detailed Dimensions
Based on GB/T 3091, BS 1387 and EN 10255 standards, the outer diameter is 76.1mm.
| NPS | 2-1/2 inch |
| DN65 | |
| OD | 76.1mm |
| 2.875inch | |
| SCH40 | 5.16mm |
| 0.203inch | |
| ID | ~62.7mm |
| Theoretical Weight | ~8.63 kg/m |
| 5.80 lb/ft |
Note: There are two outer diameter systems for 2-1/2-inch galvanized pipe. According to ASME B36.10 American standard, OD is 73.0mm. For EN 10255/GB/T 3091 (British & Chinese standards), the OD is 76.1mm.
2-1/2” Gi Pipe Features
- Corrosion Resistance It features a robust anti-corrosion zinc layer that effectively isolates external media and prevents direct contact between carbon steel pipe and acid, alkali and salt substances in the service environment.
- Stable Performance The base steel material is uniform with dense and consistent zinc coating. The pipe delivers excellent bending, punching and compression resistance performance.
- High Compatibility The outer diameter complies with NPS standard system, matching global 2-1/2 inch galvanized pipe fittings. Flange connection, threaded connection and welding connection are all applicable.
- Cost Effective This size sits between 2 inch and 3 inch pipe, offering proper flow cross-section and high flow velocity. It is more economical than stainless steel pipe.
Material Grade Introduction
- Q235B complies with GB/T 3091. Its tensile strength ranges from 375~500MPa and yield strength ≥235MPa. It is the most universal grade.
- ASTM A53 Gr.B follows the ASTM A53 standard, with tensile strength ≥415MPa and yield strength ≥240MPa.
- S235JR: Meets EN 10255 standard. Tensile strength is 360~510MPa and yield strength ≥235MPa.
- S195T: Complies with EN 10255, tensile strength approximately 300~430MPa, suitable for welded structural pipes.
- STK400: JIS G3444 grade for structural steel pipe. Tensile strength ≥400MPa and yield strength ≥245MPa.
Wall Thickness Schedule for 2.5 Inch Galvanized Pipe
| Specification | Nominal Diameter | OD (mm) | WT (mm) | Theoretical Weight (kg/m) | Weight per 6m Piece (kg) |
|---|---|---|---|---|---|
| 2-1/2″ SCH10 | DN65 | 76.1 | 3.05 | ~5.47 | ~32.8 |
| 2-1/2″ SCH20 | DN65 | 76.1 | 3.91 | ~7.13 | ~42.8 |
| 2-1/2″ SCH40 | DN65 | 76.1 | 5.16 | ~9.29 | ~55.7 |
| 2-1/2″ SCH80 | DN65 | 76.1 | 7.01 | ~12.28 | ~73.7 |
Remarks The above table follows GB/T 3091, BS 1387 and EN 10255 standards with OD of 76.1mm. If ASTM A53 American standard pipe (OD=73.0mm) is required, the weight will be about 4%~5% lighter. Welcome to send separate inquiries.
Pressure Rating of Different Specifications
Calculated under normal temperature and regular medium environment
| Specification | Max Working Pressure (MPa) | Safety Test Pressure (MPa) | Application Scenarios |
|---|---|---|---|
| 2 1/2” SCH20 | 1.6MPa | 2.0MPa | Civil or low-pressure pipelines |
| 2 1/2” SCH40 | 2.5MPa | 3.0MPa | Fire protection and industrial pipelines |
| 2 1/2” SCH80 | 4.0MPa | 4.8MPa | High-pressure pipelines |
The data above applies to EN / GB standard pipe (OD76.1mm), Q235B material with 4 times safety factor.
Application
- Water Supply and Drainage Projects: Piping systems for municipal parks, green belts, road projects, residential communities, and shopping malls.
- HVAC and Gas Systems: Smoke exhaust pipes, heating pipelines, gas transmission pipes and cooling water pipes for air conditioning.
- Industrial Fluid Transportation: Factory circulating water, wastewater discharge, agricultural irrigation branch pipes and workshop pressure pipes.
- Steel Structure Supporting Frames: For prefabricated modular houses, support pipes for grain silos and agricultural greenhouses, guardrails and structural supports for urban fencing.
Production Process of DN65 Pipe
DN65 galvanized pipes are mainly divided into ERW longitudinal hot-dip galvanized pipe and seamless hot-dip galvanized pipe. We adopt a mature standardized production process and strict full-process quality inspection.
ERW Longitudinal Galvanized Pipe
Process Hot rolled steel coil forming → High frequency resistance welding → Weld seam flaw detection → Fixed-length cutting → Pickling → High-temperature hot-dip galvanizing → Passivation → Drying & Quality Inspection → Finished product warehousing.
Seamless Galvanized Pipe Process
Solid steel billet heating → Hot rolling piercing / Cold drawing forming → Sizing & straightening → Non-destructive testing → Finishing and cutting → Pickling → High temperature hot dip galvanizing → Coating inspection → Finished product warehousing.
FAQ
Q: What is the difference between hot-dip galvanized and electro-galvanized 2.5-inch steel pipe?
A: Hot-dip galvanizing adopts high-temperature immersion coating. It delivers thick zinc layer, strong coating adhesion, and a long anti-corrosion lifespan, ideal for long-term outdoor usage. Electro-galvanizing is a surface spraying process with thin zinc layer and lower cost. It is only suitable for short-term service under dry indoor conditions.
Q: Do you support custom sizes and non-standard processing?
A: Yes. Custom fixed lengths, special wall thickness, beveling, hole punching, painting, and threading processing are available as requested. OEM branding and customized packaging services are also supported.
Q: Are your products compliant with export standards and can you provide inspection certificates?
A: All products meet ASTM, GB and other international standards. Material test certificates, mechanical performance reports and zinc coating inspection reports can be supplied. The pipes pass customs inspection and fit full-container export globally.
Q: What is the normal delivery cycle?
A: Standard in-stock items have a lead time of 10-18 days. Lead time for non-standard customized products will be confirmed separately according to production volume. Priority production arrangement is available for bulk orders.
Why Choose Us
- Factory Direct Supply We own galvanizing and deep processing workshops without intermediate markup, delivering competitive price at equal quality.
- Strict Quality Control Full-process non-destructive testing, mechanical property test and zinc layer inspection are implemented to eliminate defective goods and guarantee export-grade quality.
- Complete Product Range Full stock of 2 1/2 inch SCH20 / SCH40 / SCH80 pipes. Material grades cover mainstream domestic and international standards.
- One-stop Custom Service Our service integrates manufacturing, cutting, galvanizing, painting, packaging and export customs declaration. Dedicated salesperson follows up the whole project for worry-free cooperation.
Glory Steel Plant, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE-certified factory with an annual output of 100,000 tons. Specialize in manufacturing GI iron pipes in all sizes, with popular sizes including 1/2 inch, 1.5 inch, 2 inch, as well as 4 inch and 6 inch black tubing. We manufacture With our high-quality products and services, we export to over 120 countries.
