API 5CT T95 Casing For Sour Service
What is API 5CT T95 Casing for Sour Service?
API 5CT T95 is a Quenched and Tempered (Q+T) steel grade with a minimum yield strength of 95,000 psi. Its primary characteristic is Sulfide Stress Cracking (SSC) resistance.
In "sour" environments (wells containing H2S and water), standard steel becomes brittle and cracks. T95 is manufactured with a highly uniform microstructure and strict hardness limits to prevent these catastrophic failures, ensuring well integrity in acidic, high-pressure conditions.
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API 5CT T95 Specification Table
| Property | Details |
| Standard | API Spec 5CT / ISO 11960 |
| Grade | T95 (Type 1) |
| Product Specification Level | PSL-1, PSL-2, PSL-3 |
| Manufacturing Process | Seamless (SMLS) - Mandatory for T95 |
| Heat Treatment | Full-length Quenched & Tempered (Q+T) |
| Service Environment | Sour Service (H2S resistance) |
API 5CT Gr. T95 Tubing & Casing Chemical Composition (%)
T95 requires precise alloying (Chromium and Molybdenum) and extremely low impurities (P & S) to achieve corrosion resistance.
| Grade | C | Mn | Mo | Cr | P (max) | S (max) | Si |
| T95 | 0.25-0.35 | 0.40-0.70 | 0.25-0.80 | 0.80-1.50 | 0.020 | 0.010 | 0.45 max |
API 5CT T95 Casing & Tubing Tensile & Hardness Requirements
The Hardness Limit is the most critical parameter for T95 to ensure its suitability for sour service.
| Steel Grade | Yield Strength (psi) | Tensile Strength (psi) | Max Hardness (HRC) |
| T95 | 95,000 – 110,000 | 105,000 min | 25.4 HRC |
API 5CT Grade T95 Casing & Tubing Color Code
API standardizes color coding for easy field identification.
Base Color: Silver
Band Color: One White Band
API 5CT T95 Size Chart (Casing & Tubing)
| Type | OD (Inches) | OD (mm) | Wall Thickness (mm) | Connections |
| Tubing | 2-3/8" | 60.32 | 4.24 – 4.83 | EUE, NUE, Premium |
| Tubing | 3-1/2" | 88.90 | 5.49 – 12.09 | EUE, NUE, Premium |
| Casing | 4-1/2" | 114.30 | 5.21 – 13.06 | BTC, LTC, STC, Premium |
| Casing | 7" | 177.80 | 6.91 – 15.11 | BTC, LTC, Premium |
| Casing | 9-5/8" | 244.48 | 7.92 – 15.11 | BTC, LTC, Premium |
| Casing | 13-3/8" | 339.72 | 9.65 – 15.11 | BTC, LTC, Premium |
T95 Casing & Tubing Outside Diameter (OD) Tolerances
| OD Size (Inches) | Tolerance |
| < 4-1/2" | ± 0.031 inch (± 0.79 mm) |
| ≥ 4-1/2" | + 1.00% / - 0.50% |
Application of T95 Casing & Tubing
Sour Gas Wells: Specifically designed for wells where H2S concentration exceeds the safety threshold for standard grades.
Deep Well Completion: High-pressure environments that require both high strength and ductility.
Corrosive Reservoirs: Used in formations where Sulfide Stress Cracking (SSC) is a primary risk.
Offshore Drilling: Where safety and material reliability are paramount due to high intervention costs.
Test equipmen of T95 OCTG
T95 OCTG Factory
FAQ
What is T95 steel?
T95 steel is a high-strength, premium oilfield steel grade used for Casing and Tubing in the oil and gas industry.
Standard: It is governed by the API 5CT specification (Group 2).
Strength: The "95" stands for its minimum yield strength of 95,000 psi.
Specialty: Sour Service. It is specifically designed to resist Sulfide Stress Cracking (SSC) in environments where Hydrogen Sulfide (H2S) is present.
Key Requirement: To prevent cracking in corrosive gas, its hardness is strictly controlled (Maximum 25.4 HRC).
What is a T95 used for?
T95 is primarily used for Casing and Tubing in "Sour Service" oil and gas wells. These are environments where Hydrogen Sulfide (H2S) gas is present, which would cause standard steel to crack and fail.
Sour Gas Production: Transporting high-pressure gas that contains corrosive H2S.
Deep Well Casing: Acting as a structural liner for deep wellbores where both high strength and corrosion resistance are required.
Preventing Catastrophic Failure: Used specifically to avoid Sulfide Stress Cracking (SSC), which can lead to sudden pipe bursts in acidic environments.
Offshore Drilling: Used in critical subsea wells where safety and material reliability are mandatory due to high repair costs.
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