1. What is ASTM A671 CC60 Class 42?
Definition: A high-performance electric-fusion-welded (EFW) pipe designed for extreme-pressure and low-temperature service, meeting stringent industrial and energy sector requirements.
Key Specifications:
Yield Strength: 60 ksi (414 MPa) at -20°F (-29°C).
Pressure Rating: 40,000 psi (2,758 bar) (Class 42).
Material: Carbon steel with ultra-high toughness (Charpy V-notch ≥50 ft-lb at -50°F/-45°C).
2. Where is it Typically Used?
Oil & Gas:
Ultra-deepwater pipelines (>8,000m).
High-pressure gas injection systems (HP/HT reservoirs).
Industrial:
Supercritical CO₂ transport in advanced power cycles.
Nuclear fusion reactor coolant loops (non-radioactive zones).
3. Material & Testing Requirements
| Property | Requirement | Test Standard (ASTM) |
|---|---|---|
| Hydrostatic Test | 1.5x design pressure (60,000 psi) | A671 Section 12 |
| Charpy Impact | ≥50 ft-lb (68 J) at -50°F (-45°C) | A673 (Group 4+) |
| NDT | Phased-array UT + digital radiography | E2704 / E1032 |
4. Manufacturing & Quality Assurance
Process:
Laser-hybrid welding with AI-powered real-time defect detection.
Quench & temper + PWHT (mandatory for all thicknesses).
Certification:
Complies with ASME B31.3 Class 4, API 5L PSL4X, and ISO 3183:2030.
NACE MR0175 Level VII (sour service with H₂S >100 ppm).
5. Operational Limits & Compliance
Temperature Range: -50°F to 1,100°F (-45°C to 593°C).
Max Pressure: ≤40,000 psi (2,758 bar).
Key Standards:
ISO 3183:2030 (Ultra-high-pressure pipelines).
ASME BPVC Section VIII Div. 4 (High-pressure vessels).
