Product Overview –ASTM A671 EFW Pipes
ASTM A671 pipes are manufactured using Electric Fusion Welding (EFW), where plates are welded together to produce large-diameter pipes suitable for pressure and temperature applications.
These pipes are available in multiple grades and classes (such as CC60, CC65, CC70), allowing customization based on strength, temperature, and testing requirements.
Unlike ERW pipes, EFW pipes are typically used for larger diameters and thicker wall applications making them suitable for critical industrial systems.
They undergo various heat treatments and non-destructive testing, ensuring compliance with stringent project specifications.
These pipes are widely used in oil & gas, petrochemical, power generation, and process industries.
Standard & Material Identification - ASTM A671 EFW Pipes
Technical Specifications – ASTM A671 EFW Pipes
| Pipe Type: | Electric Fusion Welded Pipes |
| Manufacturing Process: | Plate → Forming → EFW Welding → Heat Treatment → Testing |
| Outer Diameter: | 350 mm to 2000 mm |
| Wall Thickness: | 6 mm to 50 mm |
| Length Options: | Up to 12 meters/Custom Fabricated Lengths Available |
| Surface Finish: | Bare/Painted/3LPE Coated/FBE Coated |
| Testing Methods: | Radiographic Testing (RT)/Ultrasonic Testing/Hydrostatic Testing/Charpy Impact Test (if required)/PMI Testing |
| Certification : | EN 10204 3.1 / 3.2 MTC |
Third Party Inspection Available
All specifications are in accordance of ASTM A671 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition – ASTM A671 Pipes
| Element | Max (%) |
|---|---|
| Carbon (C): | 0.30% |
| Manganese (Mn): | 0.85 – 1.50% |
| Phosphorus (P): | 0.035% |
| Sulfur (S): | Max 0.035% |
| Iron | Balance |
Note: The chemical composition depends on the base plate used, typically pressure vessel quality steel like A516.
Mechanical Properties – ASTM A671 Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 415 – 585 MPa |
| Yield Strength | 240 MPa |
| Impact Test | As per class requirement |
Mechanical properties vary depending on the selected grade and class, allowing customization for specific project requirements.
Grades & Classes Available
Common Grades
- 🔸CC60
- 🔸CC65
- 🔸CC70
Class Types
- 🔸Class 10 – No heat treatment
- 🔸Class 11 / 12 – With heat treatment
- 🔸Class 20 / 22 – With radiography
- 🔸Class 30 / 32 – With full NDT + impact testing
Engineering & Project Performance Advantage
ASTM A671 EFW pipes are designed for custom-engineered industrial systems.
- Why they are used in major projects:
- 🔸Suitable for large diameter pipelines
- 🔸Customizable grades and classes
- 🔸High strength for pressure service
- 🔸Comprehensive testing and inspection
- 🔸Reliable for critical infrastructure
This makes them essential for EPC contractors and industrial projects.
Industry Applications of ASTM A671 pipes
- Where ASTM A671 pipes are used:
- 🔸Oil & Gas Pipelines
- 🔸Refineries
- 🔸Power Plants
- 🔸Petrochemical Industries
- 🔸Pressure Systems
- 🔸Offshore & Onshore Projects
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