1. What is ASTM A671 CJF115 Class 13?
Standard: EFW carbon steel pipe for low-temperature service (-115°F/-81.7°C)
Class 13: 13,000 psi (90 MPa) hydrostatic test pressure
Key Features:
"CJF115" = Charpy V-notch testing at -115°F (min. 22 ft-lb/30 J)
Single-normalized heat treatment
2. Where is it typically used?
Industrial:
LNG liquefaction plants
Cryogenic heat exchangers
Energy:
Medium-pressure gas processing
Refrigeration system main lines
3. Material properties?
Strength:
Tensile: ≥75 ksi (517 MPa)
Yield: ≥50 ksi (345 MPa)
Toughness:
Impact tested at -115°F
Min. elongation: 28%
Chemistry:
Carbon: ≤0.22%
S/P ≤0.020%
4. Manufacturing process?
Welding:
Standard EFW with post-weld normalization
Testing:
Hydrostatic: 13,000 psi (90 MPa)
NDE: RT or UT (100% coverage)
Quality:
Standard dimensional tolerances
5. Fabrication requirements?
Welding:
Preheat: 350–550°F (177–288°C)
Optional PWHT for severe service
Forming:
Cold bending (min. 12D radius)
Inspection:
Visual and NDE per project specs
