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ASTM A671 Pipe
ASTM A671 Pipe
ASTM A671 pipe is a welded carbon steel pipe made from pressure vessel-quality steel plates using electric fusion welding. Designed for atmospheric and lower temperature applications, A671 EFW pipe is commonly used in transmission pipelines, power generation, petrochemical industries, and structural projects. Popular grades include A671 CC60, CC65, and CC70, which meet the standards of ASME and ASTM for welded carbon steel pipes used in pressure systems.
Product Specifications
| Chemical Requirements | |||||
| Grade | C (%) | Mn (%) | P (%) | S (%) | Si (%) |
| CA55 / CB55 / CC55 | 0.28 | 0.29–1.06 | 0.035 | 0.035 | 0.13–0.45 |
| CA60 / CB60 / CC60 | 0.29 | 0.29–1.06 | 0.035 | 0.035 | 0.13–0.45 |
| CA65 / CB65 / CC65 | 0.3 | 0.29–1.06 | 0.035 | 0.035 | 0.13–0.45 |
| CA70 / CB70 / CC70 | 0.31 | 0.29–1.06 | 0.035 | 0.035 | 0.13–0.45 |
| Mechanical Properties | |||
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
| CA55 / CB55 / CC55 | 205 | 380–515 | 27 |
| CA60 / CB60 / CC60 | 220 | 415–550 | 25 |
| CA65 / CB65 / CC65 | 240 | 450–585 | 23 |
| CA70 / CB70 / CC70 | 260 | 485–620 | 21 |
| A671 – Impact Test & Heat Treatment Summary | ||
| Class | Heat Treatment Requirement | Impact Test Requirement |
| Class 10 | No Post Weld Heat Treatment (PWHT) | No impact test required |
| Class 11 | PWHT after welding | Impact tested at room temperature |
| Class 12 | PWHT after welding | Impact tested at specified low temperature (e.g., -46°C) |
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More Details
ADVANTAGES/DISADVANTAGES
Advantage: can withstand high temperatures of 593℃
Disadvantage: 100% radiographic inspection is required, a complicated process
INDUSTRIES
Petrochemical/Nuclear/Specialty Equipment
APPLICATIONS
Refinery Hydrogenation Reactor/Nuclear Power Plant Piping/Supercritical CO₂ Transportation
