- 1. Introduction: The Trusted Solution forHigh-Pressure Environments
- 2. Overview of ASTM A672 Standard
- 3. Real Project Applications
- 4. Case 1: Middle East LNG Terminal Project
- 5. Case 2: Southeast Asia Refinery Expansion Project
- 6. LONGMA’s In-House Laboratory: The Foundation of Quality Assurance
- 7. Why LNG and Refinery Clients Choose LONGMA
- 8. Conclusion: Quality That Powers Global Energy Projects
Introduction: The Trusted Solution forHigh-Pressure Environments
With the global expansion of energy infrastructure, LNG (Liquefied Natural Gas) terminals and refinery plants demand pipeline systems that can withstand high pressure, elevated temperatures, and corrosive media. These environments place extreme requirements on material integrity, welding quality, and inspection standards.
Among various steel pipe materials, ASTM A672 pipe has become a preferred choice due to its excellent mechanical strength, weldability, and pressure-grade versatility. With over 20 years of experience, LONGMA Steel Pipe Factory has provided advanced Electric Fusion Welded (EFW) solutions for multiple LNG and refinery projects worldwide.
Overview of ASTM A672 Standard
The ASTM A672 specification covers electric-fusion-welded (EFW) steel pipes fabricated from pressure vessel-quality carbon steel plates. These pipes are primarily used for high-pressure and high-temperature service applications, including steam, gas, and liquid transmission systems.
The table below highlights key material grades and their characteristics:
| Material Grade | Heat Treatment Class | Yield Strength (MPa) | Typical Applications |
| ASTM A672 C60 CL22 | Normalized | ≥240 | Steam condensing systems, heating pipelines |
| ASTM A672 C65 CL22 | Normalized + Stress Relieved | ≥260 | LNG pipelines, condensate loops |
| ASTM A672 C70 CL32 | Fully Annealed | ≥290 | Refinery systems, boiler feed lines |
Each grade is designed to perform under specific conditions — ASTM A672 C65 CL22, for example, offers superior performance in cyclic temperature and pressure environments common in LNG applications.
Real Project Applications
Case 1: Middle East LNG Terminal Project
- Product Used: ASTM A672 C65 CL22 EFW Pipe (DN600–DN1200)
- Application: High-pressure steam return system in LNG vaporization zone
- Operating Conditions: 450°C temperature, 10MPa pressure
- Client Requirements: 100% radiographic testing, anti-brittle fracture performance
LONGMA Solution:
LONGMA supplied ASTM A672 C65 CL22 pipes manufactured using automated EFW technology to ensure dense and uniform welds. Non-destructive testing followed ASTM E213 (UT) and ASTM E94 (RT) standards to verify internal and weld integrity.
Results:
- 100% compliance with ASTM A672 specificationverified by BV inspection;
- Zero leakage or fatigue cracking after two years of continuous operation;
- The client extended additional orders for phase II expansion pipelines.
Case 2: Southeast Asia Refinery Expansion Project
- Product Used: ASTM A672 C60 CL22, ASTM A672 C70
- Application: Crude oil heating and high-pressure steam distribution
- Operating Conditions: 380–420°C, 8MPa
- Key Requirements: Long-term high-temperature resistance and sulfur corrosion prevention
LONGMA’s Technical Approach:
To meet extreme refinery conditions, ASTM A672 C70 pipes were selected and underwent Post Weld Heat Treatment (PWHT) to relieve residual stress and prevent delayed cracking.
| Inspection Method | Standard Reference | Purpose | Stage |
| Ultrasonic Testing (UT) | ASTM E213 | Detect internal flaws | Post-weld |
| Radiographic Testing (RT) | ASTM E94 | Validate weld soundness | Sampling |
| Magnetic Particle Testing (MT) | ASTM E709 | Detect surface cracks | Post-machining |
| Hydrostatic Test | ASTM A672 §22 | Verify pressure integrity | Before delivery |
Results:
All pipes passed client-side inspection and ASME verification, demonstrating stable long-term performance and superior pressure resistance.
LONGMA’s In-House Laboratory: The Foundation of Quality Assurance
Unlike trading companies, LONGMA owns a full-scale in-house laboratory equipped with non-destructive testing systems and metallographic analyzers. Every ASTM A672 pipe undergoes strict inspection before shipment, including:
- Chemical Composition Analysis
- Ensures compliance with ASTM A672 chemical limitsfor elements such as C, Mn, P, and S.
- Mechanical Testing
- Covers yield strength, tensile strength, and elongation
- Metallographic Examination
- Analyzes microstructure to ensure no abnormalities in the heat-affected zone (HAZ).
- Hydrostatic and Air Tightness Testing
- Simulates operating pressure to confirm leak-free performance.
This comprehensive quality system enhances customer confidence and establishes LONGMA as a leading China ASTM A672 exporter with a proven global record.
Why LNG and Refinery Clients Choose LONGMA
| Client Concern | LONGMA Solution | Outcome |
| Material reliability | High-grade ASTM A672 C65 CL22 / C70 pipes | Improved strength and pressure resistance |
| Procurement risk | BV / SGS / TUV third-party certification | Enhanced trust and transparency |
| Delivery schedule | Fully controlled in-house production | Guaranteed on-time delivery |
| Customization | Multi-size and heavy-wall options | Meets diverse engineering demands |
LONGMA is not only an ASTM A672 exporter but also a strategic partner for global energy infrastructure projects.
Conclusion: Quality That Powers Global Energy Projects
The successful application of ASTM A672 pipes in LNG and refinery facilities demonstrates their outstanding performance under high temperature, pressure, and corrosion. Backed by more than 20 years of manufacturing experience and comprehensive testing capabilities, LONGMA Steel Pipe Factory stands out as a trusted ASTM A672 c65 cl22 supplier for energy projects worldwide.
If you are looking for a reliable ASTM A672 pipe manufacturer with global certifications and strict quality control, LONGMA is your ideal choice to ensure long-term operational safety and efficiency.
