1. What is ASTM A671 CJB115 Class 11 steel pipe?
Answer:
ASTM A671 CJB115 Class 11 is an electric-fusion-welded (EFW) carbon steel pipe designed for low-pressure and moderate-temperature service (typically above -20°F/-29°C). The "Class 11" designation indicates a minimum yield strength of 11 ksi (76 MPa), making it suitable for general industrial applications with slightly higher requirements than Class 10.
2. Key specifications and properties?
Answer:
Material Grade: CJB115 carbon steel (higher carbon than CJA grades)
Yield Strength: ≥11 ksi (76 MPa)
Tensile Strength: 50-70 ksi (345-483 MPa)
Impact Test: Not required for standard applications
Chemical Composition: C≤0.35%, Mn≤1.35%, P/S≤0.035%
3. Typical applications?
Answer:
Low-pressure fluid transport (water, oil, gas)
Structural components in mild environments
Industrial piping systems with moderate strength requirements
4. How does it compare to other CJB115 classes?
Answer:
| Class | Yield Strength | Pressure Rating |
|---|---|---|
| 10 | 10 ksi | Basic low-pressure |
| 11 | 11 ksi | Enhanced low-pressure |
| 15 | 15 ksi | Medium-pressure |
5. Fabrication and welding requirements?
Answer:
Welding: Standard procedures (preheat optional for thick sections)
Testing: Hydrostatic testing at 1.5x design pressure
Forming: Cold bending permitted for most applications
