What is ASTM A671 CJE115 Class 13?A carbon steel pipe for low-temperature service, meeting:
"CJE115": Electric-fusion-welded (EFW) with Charpy V-notch impact testing at -115°F (-81.7°C).
Class 13: Hydrostatic test pressure of 13,000 psi (90 MPa).
Key applications?
Cryogenic systems (LNG/LPG pipelines, liquid nitrogen/oxygen storage).
Refrigeration plants (ammonia/CO₂ piping).
Arctic/subzero infrastructure (offshore platforms, cold-climate pipelines).
Material properties?
Tensile strength: ≥60 ksi (414 MPa).
Yield strength: ≥35 ksi (241 MPa).
Impact toughness: Min. 15 ft-lb (20 J) at -115°F.
Heat treatment: Normalized (mandatory for CJE115).
Manufacturing & testing?
Welding: EFW with 100% radiography (RT) or ultrasonic testing (UT).
Defect control: Repairs per ASTM A671 Section 12.
Hydrostatic test: 13,000 psi (90 MPa) minimum.
Fabrication guidelines?
Preheat: 200–400°F (93–204°C) for welding.
PWHT: Recommended for stress relief.
Cold bending: Permitted with radius ≥5x pipe diameter.
