API 5CT T95 Feed Tube For Acid Service
API 5CT T95 is a high-strength, Sour Service grade of casing and tubing, categorized under Group 2 of the API 5CT specification. It is processed through Quenched & Tempered (Q&T) heat treatment and is specifically engineered for high-pressure, deep-well environments containing Hydrogen Sulfide ( H2S ). With a yield strength of 95 ksi, it offers higher performance than the standard L80 sour-service grade, making it a critical material for high-pressure acidic oil and gas field operations.
Secure Your High-Pressure Sour Wells! API 5CT T95 provides superior H2S resistance to prevent SSC failure. Request a technical proposal now.
API 5CT T95 Casing & Tubing Color Code
To facilitate quick identification on-site, the pipes and couplings are color-coded as follows:
| Grade | Body Band Color | Coupling Color |
| T95-1 | 1 Silver Band | Painted Silver (Entirely) |
API 5CT T95 Oilfield Casing Pipes Chemical Composition (%)
T95 has extremely strict requirements for impurities (P, S) to ensure excellent resistance to Sulfide Stress Cracking (SSC).
| Element | C | Mn | P | S | Si | Cr | Mo |
| Content (%) | 0.25 - 0.35 | 0.40 - 1.20 | ≤ 0.020 | ≤ 0.005 | ≤ 0.45 | 0.40 - 1.50 | 0.25 - 0.85 |
API 5CT T95 Casing for Sour Service Mechanical Properties
The core feature of T95 is the balance between high strength and controlled hardness.
| Property | Requirement |
| Yield Strength | 655 - 758 MPa (95 - 110 ksi) |
| Tensile Strength | ≥ 724 MPa (105 ksi) |
| Maximum Hardness | ≤ 25.5 HRC (or 255 HBW) |
| Hardness Variation | Strictly limited per joint to ensure uniformity |
API 5CT T95 Tubing Size Chart
| Nominal OD (Inch) | Outside Diameter (mm) | Wall Thickness (mm) | Nominal Weight (lb/ft) | Connection Type |
| 2 3/8" | 60.32 | 4.83 | 4.60 / 4.70 | NUE, EUE |
| 2 7/8" | 73.02 | 5.51 | 6.40 / 6.50 | NUE, EUE |
| 3 1/2" | 88.90 | 6.45 | 9.20 / 9.30 | NUE, EUE |
| 4" | 101.60 | 6.65 | 11.00 | NUE, EUE |
| 4 1/2" | 114.30 | 6.88 | 12.60 / 12.75 | NUE, EUE |
API 5CT T95 Casing Size Chart
| Nominal OD (Inch) | Outside Diameter (mm) | Wall Thickness (mm) | Nominal Weight (lb/ft) | Common Connections |
| 4 1/2" | 114.30 | 6.35 | 11.60 | STC, LTC, BTC |
| 114.30 | 7.37 | 13.50 | STC, LTC, BTC | |
| 5" | 127.00 | 7.52 | 15.00 | STC, LTC, BTC |
| 127.00 | 9.19 | 18.00 | STC, LTC, BTC | |
| 5 1/2" | 139.70 | 7.72 | 17.00 | STC, LTC, BTC |
| 139.70 | 9.17 | 20.00 | STC, LTC, BTC | |
| 139.70 | 10.54 | 23.00 | STC, LTC, BTC | |
| 6 5/8" | 168.28 | 8.94 | 24.00 | STC, LTC, BTC |
| 7" | 177.80 | 9.19 | 26.00 | STC, LTC, BTC |
| 177.80 | 10.36 | 29.00 | STC, LTC, BTC | |
| 177.80 | 11.51 | 32.00 | STC, LTC, BTC | |
| 177.80 | 12.65 | 35.00 | STC, LTC, BTC | |
| 7 5/8" | 193.68 | 10.92 | 33.70 | LTC, BTC |
| 193.68 | 12.70 | 39.00 | LTC, BTC | |
| 9 5/8" | 244.48 | 10.03 | 40.00 | LTC, BTC |
| 244.48 | 11.99 | 47.00 | LTC, BTC | |
| 244.48 | 13.84 | 53.50 | LTC, BTC | |
| 10 3/4" | 273.05 | 11.43 | 51.00 | STC, LTC, BTC |
| 13 3/8" | 339.72 | 12.19 | 68.00 | STC, BTC |
| 339.72 | 13.06 | 72.00 | STC, BTC |
API 5CT T95 Oil Tubing Tolerance
| Parameter | Tolerance Requirement |
| Outside Diameter (OD) |
≥ 4.5": +1.00% / -0.50%; < 4.5": ± 0.79mm |
| Wall Thickness (WT) | Minimum 87.5% of nominal (-12.5%) |
| Weight | Single Joint: +6.5% / -3.5%; Load: -1.75% |
| Straightness | Total deviation ≤ 0.2%; End deviation ≤ 3.2mm |
Testing and Inspection of API 5CT T95 Pipes
As a sour-service grade, T95 inspection is far more rigorous than standard grades:
SSC Testing (NACE TM0177): Mandatory Sulfide Stress Cracking test; this is the core qualification for T95.
Hardness Testing: Joint-by-joint inspection to ensure no single point exceeds 25.5 HRC.
Non-Destructive Testing (NDT): Including full-length Ultrasonic Testing (UT) and Magnetic Particle Inspection (MPI).
Hydrostatic Test: To verify pressure integrity and sealing under high pressure.
Physicochemical Analysis: Including Tensile tests, Impact tests (transverse and longitudinal), and Metallographic analysis.
API 5CT T95 Pipe Finishing Table
| Finish Type | Description |
| End Types | Plain End (PE), Threaded & Coupled (T&C), Upset End (UE) |
| Thread Types | BTC (Buttress), LTC (Long Round), STC (Short Round), NUE, EUE |
| Surface Protection | Black paint/rust-preventative oil exterior; threads phosphated |
| Premium Connections | Gas-tight premium threads available upon request |
API 5CT T95 Oilfield Casing Pipes Features:
Superior Sour Resistance: Specifically designed to resist Sulfide Stress Cracking (SSC) in high H2S environments.
Controlled Hardness: Strictly capped at 25.5 HRC to prevent hydrogen embrittlement while maintaining high strength.
Consistent Microstructure: Advanced alloying and Q&T processing ensure a highly uniform tempered martensite structure.
High Reliability: Stronger than L80 and significantly safer than P110 in corrosive wells.
API 5CT T95 OCTG Casing Applications:
Sour Gas Wells: Used in environments with high Hydrogen Sulfide concentrations where standard pipes would fail.
High-Pressure Extraction: Suitable for deep wells with significant collapse pressures and axial loads.
Critical Production Strings: Often serves as the production casing or tubing for high-output, deep acidic wells.
High-Risk Zones: Globally recognized as the standard for medium-to-high strength sour service pipe in complex oilfields.
API 5CT T95 Oilfield Tubing Test and inspection
API 5CT T95 Petroleum Casing Pipe Factory
FAQ
What is the tensile strength of API 5CT T95?
The minimum tensile strength of API 5CT T95 is 105,000 psi (724 MPa).
Its core mechanical properties are as follows:
Minimum tensile strength: 105,000 psi (724 MPa)
Minimum yield strength: 95,000 psi (655 MPa)
Maximum yield strength: 110,000 psi (758 MPa)
What is the length of API 5CT T95?
The lengths of API 5CT T95 follow three ranges defined by the API standard, with Range 2 being the most commonly used:
Range 1 (R1): Casing 4.88–7.62m; Tubing 6.10–7.32m.
Range 2 (R2): Casing 7.62–10.36m; Tubing 8.53–9.75m (the most commonly used industry standard length).
Range 3 (R3): Casing 10.36–14.63m; Tubing 11.58–12.80m.
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