1. What is ASTM A671 CJF115 Class 11?
Standard: EFW carbon steel pipe for low-temperature service (-115°F/-81.7°C)
Class 11: 11,000 psi (76 MPa) hydrostatic test pressure
Key Features:
"CJF115" = Charpy V-notch testing at -115°F (min. 17 ft-lb/23 J)
Single-normalized heat treatment
2. Where is it typically used?
Industrial:
LNG transfer pipelines
Cryogenic processing units
Energy:
Low-to-medium pressure gas distribution
Refrigeration system headers
3. Material properties?
Strength:
Tensile: ≥65 ksi (448 MPa)
Yield: ≥40 ksi (276 MPa)
Toughness:
Impact tested at -115°F
Min. elongation: 22%
Chemistry:
Carbon: ≤0.28%
S/P ≤0.030%
4. Manufacturing process?
Welding:
Standard EFW with post-weld normalization
Testing:
Hydrostatic: 11,000 psi (76 MPa)
NDE: RT or UT (100% coverage)
Quality:
Standard dimensional tolerances
5. Fabrication requirements?
Welding:
Preheat: 250–450°F (121–232°C)
Optional PWHT for severe service
Forming:
Cold bending (min. 7D radius)
Inspection:
Visual and NDE per project specs
