1. What is ASTM A671 CB70 Class 13?
: ASTM A671 high-pressure cryogenic-grade.
:
70 ksi (483 MPa) minimum yield strength-50℃F (-45℃).
3,250 psi (224 bar) (Class 13 rating).
carbon-manganese steel with optional Ni/Cr alloying for enhanced toughness.
2. Applications
:
High-pressure gas transmission pipelines (e.g., LNG terminals).
Refinery cryogenic processing units.
:
Cryogenic storage tanks (-50℃F to 300℃F).
Chemical reactors requiring pressure-toughness balance.
3. Material Properties & Testing
| >=70 ksi at -50℃F (-45℃) | ASTM A370 | |
| >=20 ft-lb (27 J) at -50℃F | ASTM A673 (Charpy V-notch) | |
| 2.5x design pressure (per Class 13) | ASTM A671 Section 12 | |
| 100% weld inspection | ASTM E317 (UT), E94 (RT) |
4. Manufacturing & Certification
:
.
Normalizing for uniform microstructure.
:
ASME B31.3/B31.8ISO 3183.
Optional third-party inspection (e.g., DNV, API).
5. Operational Limits & Compliance
: -50℃F to 650℃F (-45℃ to 343℃).
: <=3,250 psi (224 bar) for Class 13.
:
(Welding).
PED 2014/68/EU (European pressure equipment directive).
