API 5CT P110 Deep Well Casing
API 5CT P110 is a high-strength steel grade used primarily for casing in oil and gas wells. It is categorized under the "High Strength" group of the API 5CT specification.
Naming Convention: The "P" represents the steel grade, and "110" refers to the minimum yield strength of 110,000 psi.
Applications: It is specifically designed for deep wells, ultra-deep wells, and high-pressure environments where the casing string must support its own massive weight and withstand high internal burst pressures.
Note: While P110 has high tensile strength, it is generally more sensitive to Sulfide Stress Cracking (SSC). Therefore, caution is required when using standard P110 in high-concentration H2S (sour) environments.
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API 5CT P110 Color Code Table
Color coding is used for quick visual identification at the well site.
| Steel Grade | Color Band (on Pipe) | Coupling Color |
| P110 | One White Band | Entire coupling painted White |
API 5CT P110 Chemical Composition Table
API 5CT sets limits primarily on harmful elements (P and S). The specific alloying elements (C, Mn, Cr, Mo) are determined by the manufacturer to reach mechanical requirements.
| Element | Content (Percentage %) |
| Carbon (C) | Manufacturer defined (typically 0.25 - 0.35%) |
| Manganese (Mn) | Manufacturer defined (typically 1.20 - 1.50%) |
| Phosphorus (P) | ≤ 0.030% |
| Sulfur (S) | ≤ 0.030% |
| Silicon (Si) | ≤ 0.45% |
| Cr / Mo | Often added to improve hardenability |
API 5CT P110 Mechanical Property Table
| Property | Units (Imperial/Metric) | Value |
| Yield Strength | psi (MPa) | 110,000 - 140,000 (758 - 965) |
| Tensile Strength | psi (MPa) | ≥ 125,000 (862) |
| Hardness (Reference) | HRC | 28 - 32 (typical) |
| Elongation | % | Calculated based on specimen area (usually ≥ 15%) |
API 5CT P110 Size Chart (Common Sizes)
| Outer Diameter (OD) - inch | OD - mm | Wall Thickness Range (mm) | Weight Range (lb/ft) |
| 4-1/2" | 114.3 | 5.21 - 15.11 | 9.5 - 21.5 |
| 5-1/2" | 139.7 | 6.22 - 14.27 | 14.0 - 26.0 |
| 7" | 177.8 | 6.91 - 15.11 | 20.0 - 38.0 |
| 9-5/8" | 244.5 | 7.92 - 15.11 | 36.0 - 53.5 |
| 13-3/8" | 339.7 | 9.65 - 15.11 | 48.0 - 72.0 |
API 5CT P110 Dimensional Tolerance Table
| Item | Tolerance |
| Outside Diameter (OD) | Under 4": ±0.031"; 4" & Above: +1.00% / -0.50% |
| Wall Thickness | -12.5% (Positive tolerance limited by weight) |
| Weight | Single Joint: +6.5% / -3.5% |
| Length | R1: 4.88-7.62m; R2: 7.62-10.36m; R3: >10.36m |
| Straightness | Total deviation not to exceed 0.2% of length |
inspection of P110 casing
The primary reference standard for the inspection of P110 casing is API SPEC 5CT, which stipulates requirements regarding chemical composition, mechanical properties, dimensional tolerances, and non-destructive testing for casing pipes.
According to the 11th Edition of API SPEC 5CT (published in December 2023), Grade P110 steel must satisfy the following key inspection criteria:
- Chemical Composition: Carbon content 0.34–0.43%, Molybdenum content 0.15–0.25%, and Phosphorus and Sulfur contents both ≤ 0.030%.
- Mechanical Properties: Minimum yield strength of 758 MPa (110 ksi), tensile strength ≥ 965 MPa, and elongation of 18–32%.
- Hardness Control: Brinell hardness (HB) must comply with standard limits to prevent brittle fracture.
- Non-Destructive Testing (NDT): Includes ultrasonic testing, magnetic particle inspection, etc., to ensure the absence of defects such as cracks or folds.
- Pressure and Seal Testing: Must pass hydrostatic testing to verify pressure-bearing capacity.
- Collapse Resistance: For deep-well applications, full-scale collapse resistance testing is required to evaluate stability under complex stress conditions.
API 5CT P110 OCTG Factory
API 5CT P110 Oil Well Casing test equipments
FAQ
What is the yield strength of P110?
Steel Grade P110 has a yield strength of 758 MPa (approximately 110 ksi)-its specified minimum yield strength-and is widely utilized in oil casing applications requiring high strength.
Is P110 carbon steel?
Yes, P110 is carbon steel; more precisely, it is a high-strength low-alloy (HSLA) carbon steel, primarily used for casing and tubing in the oil and gas industry.
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