Overview of ASTM A671 Standard
ASTM A671 is a specification developed by the American Society for Testing and Materials (ASTM) for Electric Fusion Welded (EFW) carbon steel pipes intended for pressure service at low to moderate temperatures. These pipes are widely used in petrochemical plants, natural gas pipelines, and power generation systems.
Compared with seamless pipes, the ASTM A671 EFW pipe offers excellent weld quality, consistent mechanical strength, and greater cost efficiency, making it a popular choice in global infrastructure and energy projects.
Among various grades, ASTM A671 CC65 CL22 is one of the most commonly used. It provides stable chemical composition, superior weld toughness, and reliable performance under pressure, suitable for critical applications such as steam lines and oil transmission systems.
Key Export Markets
Over the past decade, the demand for ASTM A671 steel pipes has continued to rise globally, particularly in the energy and industrial construction sectors. Below is an overview of the main export regions:
| Region | Primary Applications | Market Characteristics |
| Middle East | Oil and gas pipelines | High demand for pressure-resistant and corrosion-proof ASTM A671 EFW pipes |
| Southeast Asia | Power plant and steam systems | Focus on cost-effectiveness and delivery lead time |
| Europe | Chemical and power industries | Emphasis on traceability and EN certification |
| Africa (Nigeria, Egypt) | Oil transportation and infrastructure | Preference for high-strength grades such as ASTM A671 CC65 CL22 |
| South America | Mining and energy projects | Preference for dual-certified ASTM and ISO materials |
Based on LONGMA’s export data over the past five years, the Middle East and Africa have become the two fastest-growing regions. The demand for high-strength, project-specific ASTM A671 pipes continues to expand in these markets.
International Certification and Quality Requirements
To enter global markets, ASTM A671 EFW pipes must meet a series of internationally recognized certification and inspection standards. The table below summarizes key requirements for each region:
| Certification Type | Applicable Region | Key Requirements |
| ASTM / ASME Certification | North America, Middle East | Compliance with ASTM A671 manufacturing and testing standards |
| EN 10204 3.1 / 3.2 Mill Test Certificates | Europe | Ensures traceability and third-party validation |
| ISO 9001 Quality System | Global | Focus on production consistency and process control |
| PED (Pressure Equipment Directive) | European Union | Required for pressure equipment applications |
| BV / DNV / SGS Inspection Reports | International projects | Verification of weld quality, chemical composition, and mechanical properties |
For high-grade materials such as ASTM A671 CC65 CL22, third-party inspection (e.g., SGS, BV) is often mandatory to ensure weld integrity, impact toughness, and yield strength meet international project standards.
In-House Testing and Quality Control
To guarantee product reliability, LONGMA has established a fully equipped internal laboratory to control every stage of production — from raw material inspection to final product testing. Major inspection procedures include:
- Chemical Composition Analysis– Using spectrometers to verify C, Mn, S, and P content according to ASTM A671 standards.
- Mechanical Testing– Evaluating yield strength, tensile strength, and impact values, especially for ASTM A671 CC65 CL22
- Nondestructive Testing (NDT)– Ultrasonic, X-ray, and magnetic particle tests ensure weld quality and detect potential flaws.
- Hydrostatic and Bend Tests– Verify that ASTM A671 EFW pipes maintain shape and pressure resistance under load.
Through these in-house tests, LONGMA provides not only fully compliant ASTM A671 products but also documentation such as EN 10204 3.2 certificates and third-party inspection reports, ensuring full traceability and confidence for international buyers.
Customer Trust and Brand Competitiveness
When selecting suppliers, international clients are primarily concerned about:
- Whether the product meets global certification and testing standards, and
- Whether the manufacturer has stable quality control and delivery capability.
LONGMA addresses both concerns by strictly following the ASTM A671 standard and maintaining a robust internal quality assurance system certified by ISO and PED.
Particularly in the ASTM A671 EFW pipe and ASTM A671 CC65 CL22 series, LONGMA provides not only standard dimensions but also customized wall thicknesses, welding classes, and corrosion coatings. This flexibility helps reduce procurement risks and ensures reliability for critical engineering projects.
Conclusion
As global infrastructure and energy projects continue to expand, demand for high-quality welded steel pipes is expected to rise steadily. The ASTM A671 standard, with its precise material specifications and strict inspection procedures, has become a global benchmark for pipeline systems in oil, gas, and power industries.
With over 20 years of manufacturing experience, advanced EFW welding technology, and internationally recognized certifications, LONGMA remains committed to supplying dependable, high-performance ASTM A671 EFW pipes to customers worldwide.
Choosing LONGMA means choosing quality, reliability, and international standards you can trust.
