1. What is ASTM A671 CJP115 Class 10?
A specification for electric-fusion-welded (EFW) steel pipes designed for low-temperature and high-pressure service.
CJP115: Indicates chemistry (carbon steel) and impact testing at -115°F (-82°C).
Class 10: Hydrostatic test pressure of 1,000 psi (6.9 MPa).
2. Key Material Properties?
Grade: Comparable to API 5L Grade B, but optimized for cryogenic conditions.
Strength: Yield ≥ 35 ksi (240 MPa), Tensile: 60–85 ksi (415–585 MPa).
Impact Test: Charpy V-notch required at -115°F to ensure brittle fracture resistance.
Heat Treatment: Normalized for improved toughness.
3. Typical Applications?
Used in:
LNG pipelines and storage systems.
Arctic oil/gas infrastructure.
Cryogenic process piping (e.g., ethylene, ammonia).
4. Manufacturing Requirements?
Welding: Double-welded seams with 100% radiography inspection.
Chemistry: Low sulfur/phosphorus (max 0.025% each) to prevent cracking.
Testing: Hydrostatic + supplementary impact tests.
5. How does it differ from Class 12?
Class 10 has lower hydrostatic pressure (1,000 psi vs. Class 12's 1,200 psi).
Both share identical CJP115 chemistry/impact requirements.
