API 5CT Steel Pipe Product Overview
API 5CT Casing Pipes are quenched & tempered, low-alloy steel tubes engineered for shale gas, HPHT (high-pressure high-temperature), and sour service wells. Available in grades like J55 (414 MPa yield) to P110 (862+ MPa tensile), these pipes meet ISO 11960 standards for ±0.5% wall thickness tolerances and NACE MR0175 compliance in H2S-rich environments. Seamless variants (SMLS) dominate 90% of deepwell projects, while SAWL (submerged arc welded) pipes reduce costs by 25% in shallow vertical wells.
Key Technical Specifications
1. Dimensional & Manufacturing Properties
- Size Range:
- Seamless: 60.3 mm (2⅜”) – 508 mm (20″) OD | Wall Thickness: 5.21–40 mm
- Welded (SAWL/ERW): 219 mm – 762 mm (30″) OD | Wall Thickness: 6.35–25 mm
- Tolerances:
- OD: ±0.75% (API 5CT Annex A)
- Weight: +6.5%/-3.5% (L80/P110 grades)
- Surface Treatments:
- VICOTE Coatings: 250–500 µm for >15% friction reduction
- CRAs (Corrosion-Resistant Alloys): 13Cr L80 for CO2 injection wells
2. Mechanical & Chemical Performance
Chemical Composition:
| Grade | C | Mn | Cr | Mo | P/S Max | Key Trait |
|---|---|---|---|---|---|---|
| J55 | 0.34–0.39% | 1.25–1.50% | ≤0.15% | – | 0.020/0.015 | Basic wellbore support |
| L80 | 0.15–0.22% | 0.25–1.00% | 12–14% | 0.90–1.10% | 0.020/0.010 | Sour service compliance |
| P110 | 0.26–0.35% | 0.40–0.70% | 0.80–1.10% | 0.15–0.25% | 0.020/0.010 | Ultra-high tensile strength |
Mechanical Properties:
| Grade | Yield (MPa) | Tensile (MPa) | Hardness (HRC) | Charpy Impact (-10°C) |
|---|---|---|---|---|
| J55 | 379–552 | ≥517 | ≤22 | ≥40J |
| N80 | 552–758 | ≥689 | ≤25 | ≥60J |
| P110 | 758–965 | ≥862 | ≤32 | ≥80J |
Pressure Ratings:
| OD (mm) | P110 Wall (mm) | Collapse Pressure (psi) | Burst Pressure (psi) |
|---|---|---|---|
| 244.5 | 11.99 | 9,870 | 14,200 |
| 339.7 | 13.06 | 7,550 | 10,850 |
Applications by Industry
| Industry | Use Case | Grade | Key Benefit |
|---|---|---|---|
| Shale Gas | Horizontal drilling (10,000m MD) | P110 | 965 MPa yield for fracking |
| Sour Gas | H2S-rich reservoirs (30 ppm+) | L80 13Cr | NACE MR0175 compliance |
| Geothermal | 300°C steam injection wells | N80Q | 758 MPa tensile @ 150°C |
| CCUS | CO2 storage (supercritical phase) | L80 CRA | 25-year corrosion resistance |
Global Standard Equivalents
| API 5CT | ISO 11960 | ASTM | EN |
|---|---|---|---|
| J55 | 55 | A25 | EN 10208 L245NB |
| P110 | 110 | A520 Gr.110 | EN 10208 L485QB |
| L80 | 80 | A505 Gr.80 | EN 10216-4 |
Certifications & Compliance
- Processing: API 5CT Annex H (Heat Treatment)
- Testing: Hydrostatic (API 5CT 9.5.2), SSC (NACE TM0177 Method A)
- Certifications: API Monogram, ISO 9001:2015, PED 2014/68/EU
Packing And Delivery
