API 5CT R95 Casing Pipe
API 5CT R95 is a high-strength steel grade categorized under Group 2 of the API 5CT specification. It is a Quenched & Tempered (Q&T) grade, providing a yield strength between L80/N80 and P110. R95 was introduced to bridge the performance gap in deep-well operations, offering a cost-effective alternative for wells requiring higher strength than L80 but not needing the full capacity of P110.
Looking for High Strength with Better ROI? API 5CT R95 balances performance and budget for deep-well operations. Get a Quote Today!
API 5CT R95 Casing Steel Pipe Product Specification Table
| Item | Details |
| Standard | API Spec 5CT / ISO 11960 |
| Grade | R95 |
| Group | Group 2 (Requires heat treatment) |
| Heat Treatment | Full-length Quenched & Tempered (Q&T) |
| Product Type | Casing and Tubing |
| Manufacturing | Seamless (SML) or Electric Resistance Welded (ERW) |
| Color Code | 1 Brown band + 1 Blue band |
Chemical Composition of API 5CT R95 Casing for Sour Service (%)
R95 has stricter requirements for Phosphorus (P) and Sulfur (S) compared to N80 to ensure better toughness.
| Element | C | Mn | P | S | Si | Cr | Mo |
| Content (%) | 0.15 - 0.35 | 0.45 - 1.90 | ≤ 0.030 | ≤ 0.030 | ≤ 0.45 | - | - |
Note: While Cr and Mo are not strictly mandated by API, manufacturers often add them to achieve Q&T properties.
Mechanical Analysis of API 5CT R95 Oilfield Casing
| Property | Requirement |
| Yield Strength | 655 - 758 MPa (95 - 110 ksi) |
| Tensile Strength | ≥ 724 MPa (105 ksi) |
| Hardness | No maximum limit specified, but requires high uniformity |
| Min. Elongation | Calculated based on API formula per specimen area |
Size Chart of API 5CT R95 Tubing
| Nominal OD (Inch) | OD (mm) | Wall Thickness (mm) | Weight (lb/ft) | Connection |
| 2 3/8 | 60.32 | 4.83 | 4.60 | NUE, EUE |
| 2 7/8 | 73.02 | 5.51 | 6.40 | NUE, EUE |
| 3 1/2 | 88.90 | 6.45 | 9.20 | NUE, EUE |
| 4 1/2 | 114.30 | 6.88 | 12.60 | NUE, EUE |
Size Chart of API 5CT R95 Casing
| Nominal OD (Inch) | OD (mm) | Common Wall Thickness (mm) | Weight Range (lb/ft) |
| 4 1/2 | 114.30 | 5.21 - 10.59 | 9.50 - 15.10 |
| 5 1/2 | 139.70 | 6.22 - 12.70 | 14.00 - 23.00 |
| 7 | 177.80 | 6.91 - 12.65 | 20.00 - 38.00 |
| 9 5/8 | 244.48 | 8.94 - 13.84 | 40.00 - 53.50 |
| 13 3/8 | 339.72 | 9.65 - 13.06 | 54.50 - 72.00 |
Features of API 5CT R95 Casing & Tubing
Strength Advantage: The 95 ksi yield strength is approximately 18% higher than L80/N80, providing superior collapse and tensile resistance.
Mandatory Heat Treatment: Unlike N80-1, R95 must be Quenched & Tempered. This ensures a more uniform metallurgical structure and stable mechanical properties.
High Cost-Efficiency: In wells where top-tier sour service (like T95) isn't required but high strength is necessary, R95 is a more economical choice than P110.
Enhanced Toughness: Due to stricter chemical controls and the Q&T process, R95 offers better impact toughness in lower temperatures compared to N80.
Applications of API 5CT R95 Seamless Oil Pipe
Medium-Deep Wells: Ideal for wells with depths ranging from 3,500 to 5,000 meters where downhole pressure is high.
Sweet/Non-Sour Environments: Performs excellently in wells without H2S or with very low concentrations where corrosion risk is minimal.
High-Pressure Formations: Used as technical or production casing to withstand high formation collapse pressures.
Directional & Horizontal Wells: The high yield strength helps manage the large axial loads common in horizontal drilling sections.
API 5CT R95 Oil Well Drilling Casing Pipe Application Selection Guide
| Factor | Selection Advice | Reasoning |
| If H2S is present | Prioritize L80 or T95 | R95 is not mandatory-tested for Sulfide Stress Cracking (SSC). |
| For Extreme Depth/Pressure | Choose R95 or P110 | R95 offers 95ksi; P110 offers 110ksi for high loads. |
| Limited Budget/Moderate Load | Choose N80 | N80 is cheaper but lacks the toughness of R95. |
| Higher Collapse Resistance | Choose R95 | Q&T structure in R95 is more consistent than normalized N80-1. |
| Low-Temperature Operations | Choose R95 | Heat treatment ensures better low-temperature impact performance. |
API 5CT R95 Petroleum Casing Pipe test and inspection
API 5CT R95 Oil Well Drilling Tube Factory
FAQ
What is the tensile strength of API 5CT R95 Oil And Gas Casing Pipes
The minimum tensile strength of API 5CT R95 is 105,000 psi (724 MPa).
What is the tolerance of API 5CT R95 Petroleum Casing Pipe
- Outside Diameter (OD): For sizes ≥ 4.5", the tolerance is +1.0% / -0.5%.
- Wall Thickness (WT): The wall thickness at any point shall not be more than -12.5% below the nominal thickness.
- Weight: The weight tolerance for a single joint is +6.5% / -3.5%.
- Straightness: The maximum deviation shall not exceed 0.2% of the total pipe length.
- Drift: Each pipe must pass a standard API drift test to ensure the internal diameter is clear for downhole tools.
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