1. What is ASTM A671 CD80 Class 12 Steel Pipe?
ASTM A671 CD80 Class 12 is an electric-fusion-welded (EFW) carbon steel pipelow-temperature service-80℃F/-62℃). Key specifications:
CD80Charpy V-notch impact testing at -80℃F to ensure cryogenic toughness.
Class 1212 ksi (83 MPa)low-pressure cryogenic applications (e.g., liquid nitrogen pipelines, industrial cold storage systems).
2. What are the manufacturing and certification requirements?
100% radiography (RT) or ultrasonic testing (UT) for weld integrity.
: Stress-relieved or normalized to enhance low-temperature ductility.
Chemical composition (e.g., C <= 0.30%, Mn <= 1.30%).
Mechanical properties (yield strength >= 12 ksi, tensile strength 48–68 ksi).
-80℃F.
3. How does Class 12 compare to other ASTM A671 classes?
| CD80 Class 12 | CD80 Class 20 | CD80 Class 60 | |
|---|---|---|---|
| 12 ksi (83 MPa) | 20 ksi (138 MPa) | 60 ksi (414 MPa) | |
| Low-pressure cryogenic | Moderate-pressure | High-pressure cryogenic | |
| Low-to-mid range | Mid-range |
4. What are standard dimensions and tolerances?
: 16"–120" OD (standard for industrial use).
±10% nominal thickness (per ASTM A671).
: Typically 40ft (12.2m), customizable up to 60ft.
5. How to ensure corrosion protection and longevity?
:
for indoor/mild environments.
Cathodic protection for buried installations.
:
FBE lining for chemical resistance (e.g., ammonia-based refrigeration).
: Annual inspections for coating integrity.
