1. Product Parameters
API N80 is a high-strength casing pipe under API SPEC 5CT, widely used in oil and gas drilling. Key technical parameters include:
| Parameter | Value/Description |
|---|---|
| Material Grade | N80 (Carbon steel with vanadium alloying) |
| Yield Strength | ≥552 MPa (80 ksi) |
| Tensile Strength | ≥689 MPa (100 ksi) |
| Chemical Composition | C 0.34–0.38%, Mn 1.45–1.70%, V 0.11–0.16% |
| Outer Diameter | 114.3–508 mm (4.5–20 inches) |
| Wall Thickness | 6.35–25.4 mm (0.25–1 inch) |
| Length | R-1 (4.88–7.62 m), R-2 (7.62–10.36 m), R-3 (>10.36 m) |
| Thread Type | BTC (Short Round Thread), LTC (Long Thread) |
| Standards | API SPEC 5CT, SY/T6194-96 (China) |
2. Applications
Oil & Gas Wells: Used in medium to deep wells (1,500–4,500 m) for wellbore support.
Geothermal Wells: Suitable for high-temperature environments.
Water Wells: Prevents collapse in hydrogeological exploration.
3. Advantages
High Strength: Superior tensile strength (≥689 MPa) compared to J55/K55.
Enhanced Toughness: Vanadium alloying improves impact resistance.
Cost-Effective: Balances performance and cost for deep-well applications.
Standardized: Complies with API 5CT, ensuring global compatibility.
4. Comparison with Other Grades
| Grade | Yield Strength (ksi) | Typical Use Case |
|---|---|---|
| J55 | 55 | Shallow wells |
| N80 | 80 | Medium-deep wells |
| P110 | 110 | Ultra-deep wells |
For detailed mechanical testing (e.g., flattening, hydrostatic pressure), refer to API SPEC 5CT.
