API 5CT Seamless Casing Pipe (OCTG)
Features
- Seamless construction with no weld seam, so corrosion resistance and strength are consistent along the whole pipe
- Chromium rich surface that resists rust and oxidation in harsh environments
- 316 and 316L grades with added molybdenum for better resistance to chlorides and aggressive chemicals
- Low carbon L grades that stay corrosion resistant after welding
- Solution annealed for good ductility and toughness across a wide temperature range
- Every pipe tested for pressure integrity before dispatch
- Custom lengths, end finishes, and surface treatments available
Specifications
| Parameter | Specification |
|---|---|
| Standard | API 5CT / ISO 11960 |
| Grades | H40, J55, K55, N80, L80, C90, T95, P110, Q125 |
| Manufacturing Process | Seamless, hot rolled |
| Heat Treatment | Normalized, normalized and tempered, or quenched and tempered, per grade |
| Outside Diameter | 4 1/2″ to 20″ (114.3 to 508 mm) |
| Wall Thickness | 5.2 to 16.0 mm, per API 5CT weight table |
| Length | R1 (4.88 to 7.62 m), R2 (7.62 to 10.36 m), R3 (10.36 to 14.73 m) |
| End Connections | STC, LC, BC (buttress), and XC (extreme-line), or plain end |
| Surface Finish | Black, varnished, painted, or galvanized |
| Testing | Hydrostatic, non-destructive examination, drift, tensile, hardness, and impact on request |
| Typical Use | Oil and gas well casing |
Chemical Composition and Mechanical Properties
| Element (%) | TP304 | TP304L | TP316 | TP316L |
|---|---|---|---|---|
| Carbon | 0.08 max | 0.035 max | 0.08 max | 0.035 max |
| Manganese | 2.00 max | 2.00 max | 2.00 max | 2.00 max |
| Phosphorus | 0.045 max | 0.045 max | 0.045 max | 0.045 max |
| Sulfur | 0.030 max | 0.030 max | 0.030 max | 0.030 max |
| Silicon | 1.00 max | 1.00 max | 1.00 max | 1.00 max |
| Chromium | 18.0 to 20.0 | 18.0 to 20.0 | 16.0 to 18.0 | 16.0 to 18.0 |
| Nickel | 8.0 to 11.0 | 8.0 to 13.0 | 11.0 to 14.0 | 10.0 to 15.0 |
| Molybdenum | None | None | 2.00 to 3.00 | 2.00 to 3.00 |
| Property | TP304 / TP316 | TP304L / TP316L |
|---|---|---|
| Tensile Strength | 515 MPa (75 ksi) min | 485 MPa (70 ksi) min |
| Yield Strength | 205 MPa (30 ksi) min | 170 MPa (25 ksi) min |
| Elongation | 35% min | 35% min |
Size Chart
| NPS | Outside Diameter (mm) | Available Schedules |
|---|---|---|
| 1/2″ | 21.3 | Sch 5S, 10S, 40S, 80S, 160 |
| 1″ | 33.4 | Sch 5S, 10S, 40S, 80S, 160 |
| 2″ | 60.3 | Sch 5S, 10S, 40S, 80S, 160 |
| 4″ | 114.3 | Sch 5S, 10S, 40S, 80S, 160 |
| 6″ | 168.3 | Sch 5S, 10S, 40S, 80S, 160 |
| 8″ | 219.1 | Sch 5S, 10S, 40S, 80S, 160 |
| 12″ | 323.9 | Sch 5S, 10S, 40S, 80S |
| 24″ | 609.6 | Sch 10S, 40S, 80S |
Use Case
- Supporting the wellbore and preventing hole collapse
- Isolating formations and protecting freshwater zones from contamination
- Well control during drilling, completion, and production
- Providing the conduit for tubing and downhole equipment
- Onshore and offshore oil and gas wells