Welded pipe
Welded pipes are essential components in various industrial applications, offering durability and cost-effectiveness. Our welded pipe products meet stringent quality standards to ensure reliable performance in demanding environments.
Product Specifications
- Material: Carbon steel, stainless steel, alloy steel
- Standards: ASTM A53, ASTM A106, API 5L
- Sizes: 1/2" to 24" nominal diameter
- Wall Thickness: SCH 10 to SCH XXS
- Length: 6m to 12m standard, cut-to-length available
- Surface Treatment: Black, galvanized, varnished
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| ASTM A53 Grade A | 205 | 330 | 35 |
| ASTM A53 Grade B | 240 | 415 | 30 |
| API 5L Grade B | 241 | 414 | 30 |
| ASTM A106 Grade B | 240 | 415 | 30 |
Welded Pipe Manufacturing Process
- Material inspection and preparation
- Forming through continuous rolling
- High-frequency welding (HFW) or submerged arc welding (SAW)
- Heat treatment (if required)
- Straightening and cutting
- Non-destructive testing (NDT)
- Hydrostatic testing
- Final inspection and packaging
Welded Pipe Applications
- Oil and gas transportation
- Water supply systems
- Structural applications
- Mechanical engineering
- Construction scaffolding
- HVAC systems
Welded Pipe FAQ
What is the difference between welded pipe and seamless pipe?
Welded pipe is manufactured by rolling metal and then welding it longitudinally across its length, while seamless pipe is formed by extruding the metal to the desired length. Welded pipe typically offers cost advantages for standard applications, while seamless pipe provides better performance in high-pressure applications due to its uniform structure without welding seams.
How to choose the right welded pipe for my project?
Consider these factors when selecting welded pipe: 1) Operating pressure and temperature requirements, 2) Corrosion resistance needs (determines material grade), 3) Mechanical properties required (check yield and tensile strength), 4) Environmental conditions (indoor/outdoor, exposure to elements), 5) Regulatory and industry standards compliance. Consulting with our technical team can help match the optimal pipe specification to your specific application.
What are the common welding methods for producing welded pipes?
The two primary methods are: 1) High-Frequency Induction (HFI) welding - commonly used for smaller diameter pipes, offers excellent weld quality and high production speeds. 2) Submerged Arc Welding (SAW) - used for larger diameter pipes, produces deeper penetration welds and is suitable for thicker wall pipes. The choice depends on pipe size, production volume, and final application requirements.
Quality Assurance
Our welded pipes undergo rigorous quality control measures:
| Test Type | Standard | Frequency |
|---|---|---|
| Visual Inspection | ASTM A530 | 100% |
| Hydrostatic Test | ASTM A530 | 100% |
| Ultrasonic Test | ASTM A435 | 100% |
| Mechanical Test | ASTM A370 | Per heat/lot |
| Chemical Analysis | ASTM A751 | Per heat |
Advantages of Our Welded Pipes
- Precision dimensional control (±0.1mm tolerance)
- Consistent wall thickness distribution
- Excellent weld integrity verified through NDT
- Multiple certification options (API, CE, ISO 9001)
- Customized finishing options available
Packaging Options
| Option | Description | Suitable For |
|---|---|---|
| Bundle | Pipes strapped together in bundles with protective caps | Small diameter pipes, high-volume orders |
| Single | Individual pipes with end protection | Large diameter pipes, premium grade products |
| Wooden Case | Packed in sturdy wooden cases with moisture barrier | Export shipments, high-value products |