1. What is ASTM A671 CB70 Class 10?
: ASTM A671 standard-gradecryogenic and low-pressure service (e.g., LNG, chemical processing).
:
70 ksi (483 MPa) yield strength-50℃F (-45℃).
: Hydrostatic, non-destructive (UT/RT), and Charpy V-notch impact testing.
:
for sub-zero environments without exotic materials.
2. Applications
:
LNG transport pipelines (-260℃F/-162℃).
Ammonia/chemical processing plants.
:
Cryogenic storage tanks.
Refrigeration system piping.
3. Material Properties & Testing
| >=70 ksi at -50℃F (-45℃) | ASTM A370 (mechanical) | |
| >=20 ft-lb (27 J) at -50℃F | ASTM A673 (Charpy V-notch) | |
| 1.5x design pressure | ASTM A671 Section 12 | |
| 100% weld inspection | ASTM E317 (UT), E94 (RT) |
: Carbon-manganese steel with possible nickel alloying for low-temperature toughness.
4. Manufacturing & QA
:
with post-weld heat treatment (PWHT).
for grain refinement.
:
per ASTM A671.
Third-party certification for cryogenic compliance.
5. Operational Limits & Compliance
: -50℃F to 650℃F (-45℃ to 343℃).
: <=1,000 psi (69 bar) for Class 10.
:
ASME B31.3 (Process Piping).
ISO 3183 (Pipeline Standards).
