API 5CT T95 Oilfield Casing Pipes
API 5CT T95 casing is a high-strength oil casing manufactured according to the API Spec 5CT standard published by the American Petroleum Institute (API). T95 belongs to the high-strength steel grade in API 5CT, with a minimum yield strength of 655 MPa (95 ksi) and a tensile strength ≥ 724 MPa. It is used as a reservoir casing or technical casing to isolate the production layer and establish oil and gas channels. It is suitable for medium sulfur-containing environments (special certification is required when H₂S partial pressure > 0.0003 MPa).
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API 5CT T95 is a high-strength oil pipe resistant to sulfide stress cracking (SSC). It is typically used in deep wells, high-pressure sour oil and gas environments containing hydrogen sulfide (H2S). T95 belongs to Group 2 of the API 5CT standard, and its manufacturing requirements and hardness control are more stringent than the standard L80 grade.
API 5CT Gr. T95 Oilfield Casing Pipes exporters
API 5CT Grade T95 Oil Well Drilling Casing Pipe Specification
Standard: API Spec 5CT
Grade: T95 (T95 Type 1)
Product Types: Casing and Tubing
Manufacturing: Seamless (SMLS) only (Welded is not permitted for this grade)
Delivery Condition: Full-length Quenched and Tempered (Q&T)
API 5CT T95 Casing/Tubing Color Code
Color identification is used to distinguish T95 in the field:
Tubing/Casing Body: Silver background with One White band.
Coupling: Silver with a white band (or painted entirely silver with white stripes).
API 5CT T95 Chemical Composition (%)
T95 requires precise alloying and extremely low impurity levels (Phosphorus and Sulfur) to enhance its toughness and corrosion resistance.
| Element | Content (%) |
| Carbon (C) | ≤ 0.45 |
| Manganese (Mn) | 0.35 - 1.20 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | 0.15 - 0.35 |
| Chromium (Cr) | 0.40 - 1.50 |
| Molybdenum (Mo) | 0.25 - 0.85 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.35 |
API 5CT T95 Mechanical Properties
The defining characteristic of T95 is the balance between high yield strength and a mandatory hardness ceiling.
| Property | Value (Imperial) | Value (Metric) |
| Yield Strength | 95,000 - 110,000 psi | 655 - 758 MPa |
| Tensile Strength | ≥ 105,000 psi | ≥ 724 MPa |
| Max. Hardness | ≤ 25.5 HRC | ≤ 254 HBW |
| Elongation | Based on cross-sectional area | Based on API formula |
API 5CT T95 Size and Weight Chart
Tubing Size Chart (Common Sizes)
Tubing is primarily used for extracting oil or gas from the wellbore.
| Outside Diameter (OD) - inch | OD - mm | Nominal Weight (lb/ft) | Wall Thickness - inch | Wall Thickness - mm | Metric Weight ( kg/m ) |
| 2-3/8" | 60.32 | 4.60 | 0.190 | 4.83 | 6.84 |
| 2-3/8" | 60.32 | 5.80 | 0.254 | 6.45 | 8.63 |
| 2-7/8" | 73.02 | 6.40 | 0.217 | 5.51 | 9.52 |
| 2-7/8" | 73.02 | 7.80 | 0.276 | 7.01 | 11.61 |
| 3-1/2" | 88.90 | 9.20 | 0.254 | 6.45 | 13.69 |
| 3-1/2" | 88.90 | 12.70 | 0.375 | 9.52 | 18.90 |
| 4" | 101.60 | 11.00 | 0.262 | 6.65 | 16.37 |
| 4-1/2" | 114.30 | 12.60 | 0.271 | 6.88 | 18.75 |
API 5CT T95 Casing Size Chart (Common Sizes)
Casing is used to line the borehole. T95 grade casing is frequently used in production or intermediate strings for deep and sour service wells.
| Outside Diameter (OD) - inch | OD - mm | Nominal Weight (lb/ft) | Wall Thickness - inch | Wall Thickness - mm | Metric Weight ( kg/m ) |
| 4-1/2" | 114.30 | 11.60 | 0.250 | 6.35 | 17.26 |
| 4-1/2" | 114.30 | 13.50 | 0.290 | 7.37 | 20.09 |
| 5" | 127.00 | 15.00 | 0.296 | 7.52 | 22.32 |
| 5-1/2" | 139.70 | 17.00 | 0.304 | 7.72 | 25.30 |
| 5-1/2" | 139.70 | 20.00 | 0.361 | 9.17 | 29.76 |
| 5-1/2" | 139.70 | 23.00 | 0.415 | 10.54 | 34.23 |
| 6-5/8" | 168.28 | 24.00 | 0.352 | 8.94 | 35.72 |
| 7" | 177.80 | 26.00 | 0.362 | 9.19 | 38.69 |
| 7" | 177.80 | 29.00 | 0.408 | 10.36 | 43.16 |
| 7" | 177.80 | 32.00 | 0.453 | 11.51 | 47.62 |
| 7-5/8" | 193.68 | 29.70 | 0.375 | 9.52 | 44.20 |
| 7-5/8" | 193.68 | 33.70 | 0.430 | 10.92 | 50.15 |
| 9-5/8" | 244.48 | 40.00 | 0.395 | 10.03 | 59.53 |
| 9-5/8" | 244.48 | 47.00 | 0.472 | 11.99 | 69.94 |
| 9-5/8" | 244.48 | 53.50 | 0.545 | 13.84 | 79.62 |
| 10-3/4" | 273.05 | 55.50 | 0.495 | 12.57 | 82.59 |
| 13-3/8" | 339.72 | 68.00 | 0.480 | 12.19 | 101.19 |
| 13-3/8" | 339.72 | 72.00 | 0.514 | 13.06 | 107.15 |
API 5CT T95 Oil Tube For Petroleum And Natural Gas Industries Tolerance
T95 follows the general tolerances defined in API 5CT:
Outside Diameter (OD):
For < 4-1/2": ±0.031" (±0.79mm)
For ≥ 4-1/2": -0.75% to +1.00%
Wall Thickness: -12.5% (No positive limit)
Weight: -3.5% to +6.5% (Single joint)
Straightness: Total deviation not to exceed 0.2% of the total length.
Heat Treatment
Process: Quenched and Tempered (Q&T).
Details: The pipe must be heated to an austenitizing temperature, quenched in a liquid medium, and then tempered at a temperature of no less than 593°C (1100°F) to achieve a uniform martensitic structure.
Dimensions and Masses
Calculated based on the nominal OD and wall thickness.
Formula (Metric):
W=(D−t)×t×0.0246615
(Where W = kg/m , D = OD in mm, t = wall thickness in mm)
Commonly supplied in Range 2 (28–32 ft) or Range 3 (38–45 ft).
Tensile & Hardness Requirements
Tensile Test: Conducted per heat/lot to ensure the yield strength stays within the narrow 95-110 ksi window.
Hardness Test: This is the most critical test for T95.
Hardness must not exceed 25.5 HRC.
Through-wall hardness: Testing is performed at the OD, mid-wall, and ID to ensure consistency and no "hard spots" that could lead to cracking in
H2S environments.
Pipe Process of Api 5ct gr. T95 casing pipes
Steel Making: EAF/BOF + LF + VOD (to ensure low P and S).
Pipe Rolling: Hot rolling to produce a seamless mother pipe.
Heat Treatment: Full-length Q&T to obtain required mechanical properties.
Straightening: Warm/Hot straightening to minimize residual stress.
Threading: CNC machining of API threads (BTC, LTC, STC) or Premium Connections.
Finishing: Coating, marking, and end protection.
API 5CT T95 Casing/Tubing Features
High SSC Resistance: Designed to prevent brittle failure in "Sour" (H2S) service.
Restricted Yield Strength: A narrow range (15 ksi difference) ensures predictable performance under stress.
Stress Management: Manufacturing processes are optimized to minimize residual stresses.
Reliability: Positioned between C90 and C110, providing high strength without compromising corrosion resistance.
T95 grade casing pipe Inspection Methods
Visual Inspection: Checking for surface scabs, cracks, or pits.
Dimensional Inspection: Verification of OD, wall thickness, and drift (Drift Test).
NDT (Non-Destructive Testing):
Ultrasonic Testing (UT): For wall thickness and internal defects.
Magnetic Particle Inspection (MPI): For end-area crack detection.
Eddy Current/Electromagnetic Inspection (EMI).
Hydrostatic Testing: Mandatory pressure test to ensure no leakage.
Sulfide Stress Cracking (SSC) Test: Performed according to NACE TM0177 (often specifically requested by the buyer).
Hardness Survey: Rockwell HRC testing across the cross-section.
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FAQ
What are thread type of api 5ct t95 casing ?
API 5CT T95 casing thread types are categorized into API Standard connections (primarily the high-strength BTC buttress thread and LTC round thread) and Premium Connections featuring metal-to-metal seals. Given that T95 is specifically engineered for H2S sour service, BTC is generally preferred for deep wells requiring high tensile strength; however, for high-pressure gas wells or extreme environments where leak prevention is critical, Premium Connections (such as the VAM or TP-CQ series) must be utilized to ensure gas-tight integrity and prevent the escape of corrosive media.
What is the ISO equivalent of API 5CT?
The ISO equivalent of API 5CT is ISO 11960 (titled "Petroleum and natural gas industries - Steel pipes for use as casing or tubing for wells"). These two standards are essentially identical in their technical requirements, steel grades (such as J55, L80, and T95), and testing specifications, as they were jointly developed with identical technical content for many years. Although they are now maintained and updated independently by API and ISO respectively, they remain functionally equivalent within the global oil and gas industry; API 5CT is more widely used worldwide, while ISO 11960 is frequently cited in international tenders or projects by European energy companies.
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