1. What is ASTM A671 CJF115 Class 10?
Standard: EFW carbon steel pipe for low-temperature service (-115°F/-81.7°C)
Class 10: 10,000 psi (69 MPa) hydrostatic test pressure
Key Features:
"CJF115" = Charpy V-notch testing at -115°F (min. 15 ft-lb/20 J)
Single-normalized heat treatment
2. Typical applications?
Industrial:
LNG terminal piping
Cryogenic storage tanks
Energy:
Low-pressure natural gas pipelines
Refrigeration systems
3. Material specifications?
Strength:
Tensile: ≥60 ksi (414 MPa)
Yield: ≥35 ksi (241 MPa)
Toughness:
Impact testing at -115°F
Min. elongation: 20%
Chemistry:
Carbon: ≤0.30%
S/P ≤0.035%
4. Manufacturing requirements?
Welding:
Standard EFW process
Testing:
Hydrostatic: 10,000 psi (69 MPa)
Basic NDE (RT or UT)
Quality:
Standard dimensional checks
5. Fabrication guidelines?
Welding:
Preheat: 200–400°F (93–204°C)
Optional PWHT
Forming:
Cold bending allowed (min. 5D radius)
Defect control:
Standard visual inspection
