ASTM A671 EFW Pipe
Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
ASTM A671 is a standard specification for electric-fusion-welded (EFW) steel pipe with filler metal added, fabricated from pressure-vessel quality plate. These pipes are primarily used for atmospheric and lower-temperature service. Unlike standard ERW pipes, A671 pipes are manufactured from high-quality plates (such as ASTM A516) and are available in various classes (Class 10 to 73) based on the type of heat treatment and non-destructive examination (NDE) performed.
Technical Specifications
| Feature | Details |
|---|---|
| Standard | ASTM A671 / ASME SA671 |
| Grades (Plate) | CC60, CC65, CC70, CD70, CD80 |
| Classes | CL 10, 12, 13, 22, 32, 42, 62, 72 |
| Size Range | 16" OD to 100" OD (Large Diameter) |
| Wall Thickness | 6mm to 100mm |
| Manufacturing | EFW (Electric Fusion Welded) with Filler Metal |
Common Grade Properties (Based on Plate)
| Grade | Plate Specification | Min. Yield Strength | Min. Tensile Strength |
|---|---|---|---|
| CC60 | ASTM A516 Gr. 60 | 32,000 psi (220 MPa) | 60,000 psi (415 MPa) |
| CC65 | ASTM A516 Gr. 65 | 35,000 psi (240 MPa) | 65,000 psi (450 MPa) |
| CC70 | ASTM A516 Gr. 70 | 38,000 psi (260 MPa) | 70,000 psi (485 MPa) |
Heat Treatment Classes
| Class | Heat Treatment of Pipe | Radiographic Examination |
|---|---|---|
| Class 12 | None (As-rolled plate) | Full Radiography |
| Class 22 | Normalized | Full Radiography |
| Class 32 | Stress Relieved | Full Radiography |
| Class 42 | Normalized & Tempered | Full Radiography |
Features and Benefits of ASTM A671 Pipe
- Ideal for large-diameter transport where seamless pipes are unavailable
- Manufactured from pressure-vessel quality plate for superior safety
- Flexible manufacturing allows for precise custom wall thicknesses
- Excellent impact properties at lower temperatures (Grades CC60/CC70)
- Full radiographic testing (Class 12+) ensures weld integrity
- High structural stability for heavy-duty industrial foundations
Applications & Uses
Oil & Gas
Used in large-diameter cross-country pipelines for crude oil and gas gathering.
Power Plants
Applied in circulating water systems and cooling water piping for thermal plants.
Water Mains
The primary choice for municipal high-pressure water transmission and drainage lines.