API 5CT C90 Casing Pipe
API 5CT C90 casing Supplier
API 5CT C90 casing is a high-strength, seamless steel pipe specifically designed for sour service environments (containing sulfur and hydrogen sulfide), resistant to stress corrosion cracking (SSCC). It is widely used in the construction of deep and ultra-deep oil wells, with a minimum yield strength of 620 MPa and a maximum hardness of 255 HBW, meeting the requirements of API 5CT 11th Edition and NACE MR0175 standards.
API 5CT C90 Casing Tubing Color Code
| Name | Casing and piping |
| C90 Type1 | A purple band |
API 5CT C90 seamless pipe Chemical Composition
| Grades | C | Mn | Mo | Cr | Ni | P | S |
| C90 Type1 | ≤0.35 | ≤1.20 | 0.25-0.85 | 1.50 | ≤0.99 | 0.02 | 0.01 |
| C90 Type2 | ≤0.50 | ≤1.90 | / | / | ≤0.99 | 0.02 | 0.01 |
API 5CT C90 Oil Tubing Mechanical Property
| Grade | Type | Yield strength MPa | Tensile strength min. MPa | Total elongation under load % |
| C90 | Type1
Type2 |
621-724 | 689 | 0.5 |
API 5CT Casing pipes Specification
Standard number: API SPEC 5CT (11th edition, released in December 2023)
Applicable environment: Sour Service (including H ₂ S corrosive environment)
Certification requirements: API 5CT+NACE MR0175/ISO 15156
Manufacturing process: Seamless, cold drawn or hot rolled
Heat treatment method: Quenching&Tempering
Non destructive testing: ultrasonic testing (UT), magnetic particle testing (MT), hydrostatic testing
API 5CT C90 Oilfield Casing Pipes Features (Product Features)
- High resistance to SSCC performance, suitable for "acidic wells" with high H ₂ S concentration
- Quenching and tempering treatment to obtain uniform and fine martensite structure, enhancing toughness
- Strict chemical composition control and heat treatment process ensure consistency in performance
- Support customization of outer diameter, wall thickness, length, and thread type
- Can provide certification documents such as API 5CT, ISO 9001, NACE, etc
Grade C90 Oil Well Drilling Tube Dimension In MM
| Outer Diameter (mm) | Wall Thickness (mm) | Theoretical Weight (kg/m) | Common Grade |
|---|---|---|---|
| 114.3 | 6.88 | 18.8 | C90 |
| 114.3 | 9.19 | 24.7 | C90 |
| 139.7 | 7.72 | 25.2 | C90 |
| 139.7 | 11.51 | 36.6 | C90 |
| 168.3 | 8.94 | 35.8 | C90 |
| 168.3 | 13.72 | 53.1 | C90 |
| 244.5 | 9.19 | 53.5 | C90 |
| 244.5 | 13.84 | 78.9 | C90 |
| 339.7 | 9.65 | 78.2 | C90 |
| 339.7 | 15.90 | 124.6 | C90 |
API 5CT C90 Oilfield Tubing Thread Types
| Type | Full English Name | Features |
|---|---|---|
| STC | Short Round Thread Casing | Short round thread, good sealing performance, suitable for shallow wells |
| LTC | Long Round Thread Casing | Long round thread, higher connection strength, suitable for medium to deep wells |
| BTC | Buttress Thread Casing | Buttress thread, high resistance to tension and compression, suitable for deep wells and high-pressure environments |
API 5CT C90 Petroleum Casing Pipe Test Requirements
| Test Item | Method & Standard |
|---|---|
| Tensile Test | ASTM A370 |
| Flattening Test | API 5CT |
| Impact Test | ASTM A370 (-20°C) |
| Hardness Test | HBW 10/3000 |
| Hydrostatic Test | 100% per pipe, pressure ≥ 40 MPa |
| Non-Destructive Testing | Ultrasonic Testing (UT) + Eddy Current Testing (ET) + Magnetic Particle Testing (MT) |
| SSCC Test | NACE TM0177 Method A, immersed in Solution A for 720 hours with no cracking |
API 5CT C90 OCTG Casing Hardness Table
| Item | Requirement |
|---|---|
| Average Hardness | ≤ 255 HBW |
| Maximum Single Point Hardness | ≤ 265 HBW |
| Hardness Gradient | Axial/Radial variation ≤ 30 HBW |
| Test Locations | Pipe body, weld (if applicable), coupling |
Is your well sour or CO₂ environment? Get material suitability check.
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FAQ
1.What is the diameter of API 5CT?
The diameter of API 5CT C90 casing comes in various specifications, with common outer diameters (OD) ranging from 114.3 mm to 508 mm (approximately 4-1/2 inches to 20 inches), suitable for oil and gas well requirements at different depths and pressures.
2.What size is API casing
API 5CT C90 casing offers multiple size specifications to meet the engineering needs of different oil and gas wells. Its outer diameter (OD) typically ranges from 114.3 mm to 508 mm (approximately 4-1/2 inches to 20 inches), and wall thickness and length can also be customized according to the API 5CT standard.
The length usually meets the R1 (4.86-7.62 meters), R2 (7.62-10.36 meters), or R3 (10.36-13 meters) standards. The connection methods include thread types such as STC, LTC, BTC, etc., which are suitable for different pressure environments from shallow to deep wells.
3.What is the tolerance for API 5CT casing?
Outer Diameter (OD) Tolerance: For sleeves with an outer diameter ≥ 4.5 inches (approximately 114.3 mm), the permissible tolerance is -0.5% to +1% of the nominal outer diameter.
Wall Thickness Tolerance: The permissible deviation of the sleeve wall thickness is -12.5% to +unlimited positive tolerance (usually controlled by the manufacturer), meaning the minimum wall thickness must not be less than 87.5% of the nominal value.
Length Tolerance: According to API 5CT classification:
R1 (4.86–7.62 m): Permissible deviation +0.03 m
R2 (7.62–10.36 m): Permissible deviation +0.05 m
R3 (10.36–13 m): Permissible deviation +0.05 m.
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