API 5CT T95 Casing for Sour Service is a high-strength, sulfide stress corrosion cracking (SSCC) resistant steel pipe specifically designed for use in high-sulfur (H₂S-containing) oil and gas wells, suitable for deep and ultra-deep well applications under severe conditions. It must comply with NACE MR0175/ISO 15156 standards, exhibiting excellent resistance to H₂S corrosion, and is widely used in oil and gas production in highly acidic environments .
Worried about casing corrosion during ultra-deep well mining? T95 oil casing, with a yield strength of 655-758MPa, offers dual protection against crushing and hydrogen sulfide. Click to leave your information and receive a third-party testing report!
API 5CT T95 Casing Tubing Specifications
| Item | Parameter |
|---|---|
| Standard | API 5CT, ISO 11960 |
| Grade | T95 |
| Yield Strength | 655–758 MPa (95–110 ksi) |
| Tensile Strength | ≥758 MPa |
| Heat Treatment | Quenching and Tempering (Q&T) |
| Service Application | Sour Service (H₂S environment) |
| Hardness Requirement | ≤25 HRC or ≤255 HBW |
| Certification | NACE MR0175/ISO 15156, passed SSCC test |
T95 Casing Tubing Dimensions Table
| OD (in) | OD (mm) | Common Wall Thickness (mm) | Suitable Well Depth |
|---|---|---|---|
| 4.5 | 114.3 | 8.56, 9.17, 10.92 | Medium-deep to deep wells |
| 5.5 | 139.7 | 9.17, 11.05, 13.72 | Deep wells |
| 7 | 177.8 | 10.36, 12.65, 15.88 | Deep wells |
| 9 5/8 | 244.5 | 11.05, 13.84, 15.11 | Ultra-deep wells |
| 13 3/8 | 339.7 | 12.70, 15.88, 19.05 | Ultra-deep wells |
API 5CT Grade T95 Casing Tubing Steel Color Code
| Grade | Color Marking (painted on both ends) |
|---|---|
| T95 | Red with White Band |
API 5CT Gr. T95 Tubing Chemical Composition Table
| Element | Content (%) | Notes |
|---|---|---|
| C | ≤0.35 | Enhances strength, controls hardenability |
| Mn | 0.25–1.20 | Improves toughness and workability |
| Cr | 0.40–1.50 | Increases corrosion resistance and hardenability |
| Mo | 0.15–0.85 | Enhances tempering stability and SSCC resistance |
| Ni | ≤0.99 | Improves low-temperature toughness |
| Cu | ≤0.30 | Prevents atmospheric corrosion |
| P | ≤0.015 | Harmful element, strictly controlled |
| S | ≤0.010 | Causes hot brittleness, kept low |
| V, Ti, Al | Trace | Grain refinement, performance enhancement |
API 5CT T95 Tubing Mechanical Properties
| Property | Requirement |
|---|---|
| Yield Strength (YS) | 655–758 MPa |
| Tensile Strength (TS) | ≥758 MPa |
| Elongation (50mm gauge) | ≥10% |
| Hardness | ≤25 HRC / ≤255 HBW |
| Impact Energy (-10°C) | ≥27 J average, single value ≥20 J (if required) |
| SSCC Resistance | Pass NACE TM0177 Method A |
API 5CT T95 Casing Pipe Sizes in MM Table
| Size (in) | OD (mm) | Weight Range (kg/m) | Common WT (mm) |
|---|---|---|---|
| 2 3/8 | 60.3 | 4.85–6.45 | 5.54, 6.91 |
| 2 7/8 | 73.0 | 6.40–8.65 | 6.91, 8.94 |
| 3 1/2 | 88.9 | 7.90–11.50 | 7.62, 9.52 |
| 4 1/2 | 114.3 | 10.20–16.13 | 8.56, 10.92 |
| 5 1/2 | 139.7 | 13.60–20.78 | 11.05, 13.72 |
| 7 | 177.8 | 18.00–28.10 | 12.65, 15.88 |
| 9 5/8 | 244.5 | 24.50–40.00 | 13.84, 15.11 |
| 13 3/8 | 339.7 | 48.00–72.00 | 15.88, 19.05 |
API 5CT T95 OCTG Tolerances
| Item | Allowable Tolerance |
|---|---|
| Outer Diameter (OD) | ±0.79 mm (≤101.6 mm); +1.0% / -0.5% (≥114.3 mm) |
| Wall Thickness (WT) | -12.5% |
| Length (R1) | 4.88–7.62 m |
| Length (R2) | 7.62–10.36 m |
| Length (R3) | 10.36–14.63 m |
| Weight (per piece) | +6.5% / -3.5% |
| Straightness | ≤0.2% of length |
| Thread Taper | 1:16 ± 0.002 in/in |
API 5CT T95 Casing Tubing Inspection Method
Chemical Composition Analysis: Spectral analysis for each heat to ensure key elements like C, Cr, and Mo meet specifications .
Mechanical Testing:
Tensile Test
Hardness Test (Rockwell C, HBW)
Impact Toughness Test (Charpy V-notch, if required)
Sulfide Stress Corrosion Cracking (SSCC) Test: Conducted per NACE TM0177 Method A, lasting over 720 hours in H₂S-containing solution .
Non-Destructive Testing (NDT):
Ultrasonic Testing (UT): Longitudinal and transverse flaw detection
Eddy Current Testing (ET): For tubing
Magnetic Particle Testing (MT): Surface crack inspection on threaded areas
Dimensional and Profile Inspection: OD, wall thickness, straightness, thread accuracy
Hydrostatic Test: Performed on every single pipe, pressure no less than 80% of specified minimum internal pressure resistance
GNEE API 5CT OCTG Factory
FAQ
What is the OD tolerance of API 5CT?
In the API 5CT standard, the outer diameter tolerance of steel pipes is divided into two types according to different sizes: for steel pipes with an outer diameter ≤ 114.3 mm (4 1/2 inches), the outer diameter tolerance is ±0.79 mm; for steel pipes with an outer diameter ≥ 114.3 mm, the tolerance is +1.0% / -0.5%.
What does API 5CT stand for?
API 5CT is an abbreviation for American Petroleum Institute Specification 5CT, which stands for Specification for Casing and Tubing. It is developed by the American Petroleum Institute (API) and is an internationally recognized technical standard used in the oil and gas industry to regulate casing and tubing used in oil wells.
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