1. What is ASTM A671 CJB115 Class 22 Steel Pipe?
ASTM A671 CJB115 Class 22 is an electric-fusion-welded (EFW) carbon steel pipehigh-pressure and elevated-temperature industrial applications-20℃F/-29℃). The "Class 22" designation indicates a minimum yield strength of 22 ksi (152 MPa), positioning it between standard and specialized high-pressure systems in the CJB115 series.
2. Key Material Properties?
>=22 ksi (152 MPa).
80–100 ksi (552–690 MPa).
Impact Test: Optional (required if specified for low-temperature use).
<=0.35%<=1.35%, P/S: <=0.035%.
3. Typical Applications?
High-pressure steam lines in power plants.
for oil refineries and chemical plants.
with moderate thermal stress.
4. How Does It Compare to Class 21 and Class 25?
| Class 21 | 21 ksi (145 MPa) | High-pressure systems |
| Class 22 | 22 ksi (152 MPa) | Enhanced high-pressure/thermal |
| Class 25 | 25 ksi (172 MPa) | Specialized high-pressure |
5. Fabrication & Quality Control?
300–400℃F>1" (25.4 mm).
1.5x design pressure) + optional NDE (UT/RT).
Hot bending recommended for severe deformations.
ASTM A671-26 standards.
