- 1. Overview of ASTM A671 Standard and Its Applications
- 2. Manufacturing Process and Technical Advantages of ASTM A671 EFW Pipe
- 3. Key Features and Applications of ASTM A671 CC60
- 4. Rigorous Testing and Quality Assurance
- 5. Global Engineering Applications
- 6. Conclusion: LONGMA — Building the Backbone of Global Infrastructure
In the global landscape of energy transmission and large-scale infrastructure, ASTM A671 steel pipes have become indispensable due to their excellent weldability, high-temperature strength, and pressure resistance. From transcontinental oil and gas pipelines to ultra-supercritical power plants, ASTM A671 pipes play a crucial role in ensuring the safety, efficiency, and reliability of the world’s most demanding engineering projects.
Overview of ASTM A671 Standard and Its Applications
ASTM A671 is a specification issued by the American Society for Testing and Materials (ASTM) for Electric Fusion Welded (EFW) carbon steel pipes used in pressure applications at moderate temperatures. The standard emphasizes strength, ductility, and weld quality, making it widely used in:
- Oil and gas transmission systems
- Chemical and petrochemical industries
- Power generation (thermal and nuclear)
- Marine and offshore structures
With over 20 years of manufacturing experience, LONGMA has become a trusted producer of ASTM A671 EFW pipes, ensuring superior quality and reliability through automated welding lines and comprehensive in-house testing systems.
Manufacturing Process and Technical Advantages of ASTM A671 EFW Pipe
The EFW (Electric Fusion Welding) process is at the core of ASTM A671 steel pipe production. In this method, the edges of a steel plate are fused together by an electric arc under precise control, forming a uniform and defect-free weld.
LONGMA integrates EFW with real-time digital monitoring to achieve consistent mechanical properties and flawless welding integrity.
| Production Stage | Process Description | Purpose |
| Plate Selection | High-quality steel plates compliant with ASTM A671 CC60 | Ensure chemical and mechanical conformity |
| Forming & Welding | Controlled electric fusion welding | Achieve tight, uniform, high-strength seams |
| Post Weld Heat Treatment (PWHT) | Stress relief heat treatment | Improve ductility and crack resistance |
| Ultrasonic Inspection | 100% weld scanning | Detect any internal defects |
| Hydro & Dimensional Testing | Pressure and size validation | Guarantee safety and uniformity of each pipe |
Through this optimized process, ASTM A671 EFW pipe offers exceptional durability and corrosion resistance under high-pressure and high-temperature environments.
Key Features and Applications of ASTM A671 CC60
Among multiple grades in the ASTM A671 standard, ASTM A671 CC60 is one of the most commonly used materials for moderate pressure and temperature services. It provides an ideal balance of strength, ductility, and weldability — making it a preferred choice in petrochemical and energy sectors.
| Property | ASTM A671 CC60 Specification | Typical Applications |
| Yield Strength | ≥ 260 MPa | Steam pipelines in power plants |
| Tensile Strength | ≥ 415 MPa | Petrochemical transport lines |
| Impact Toughness | 27J @ -20°C | Oil & gas transmission |
| Recommended Process | EFW + PWHT | Medium-pressure and boiler components |
Compared with seamless steel pipes, ASTM A671 CC60 EFW pipes deliver higher cost efficiency and structural reliability, especially suitable for long-distance or large-diameter pipeline projects.
Rigorous Testing and Quality Assurance
LONGMA operates a fully equipped in-house testing laboratory that strictly follows ASTM A671 clauses 8–11, ensuring every production step — from raw material to finished product — meets or exceeds the international standard.
| Test Item | Scope | Standard Reference |
| Chemical Analysis | C, Mn, Si, S, P composition | ASTM A671 §7 |
| Tensile & Impact Tests | Strength, elongation, toughness | ASTM A671 §9 |
| NDT (UT/RT) | Ultrasonic or radiographic inspection | ASTM A671 §10 |
| Hydrostatic Test | Pressure test for each pipe | ASTM A671 §11 |
Each batch of ASTM A671 EFW pipes is accompanied by an MTC (Mill Test Certificate), ensuring full traceability and transparency for global buyers.
Global Engineering Applications
LONGMA ASTM A671 EFW pipes have been successfully used in numerous international projects, including:
- Offshore oil & gas networks in the Middle East
- High-pressure pipeline systems in Nigeria’s refinery projects
- LNG terminal expansions in Southeast Asia
- Steam piping for South American thermal power plants
With consistent quality, competitive lead times, and reliable international certifications, LONGMA has established long-term partnerships with leading EPC contractors and energy enterprises worldwide.
Conclusion: LONGMA — Building the Backbone of Global Infrastructure
As global infrastructure continues to expand, ASTM A671 steel pipes remain the backbone of safe and efficient energy transport systems. LONGMA is committed to continuous innovation, advanced manufacturing, and strict quality control — delivering reliable ASTM A671 EFW pipes that meet the highest international standards.
Choosing LONGMA means choosing safety, trust, and long-term performance.
