API 5CT P110 is a high-strength oil casing and tubing steel grade under the American Petroleum Institute (API) standard, mainly used for oil and gas extraction in deep wells, ultra deep wells, and high stress geological conditions. In its name, "P" represents material grouping, and "110" represents a minimum yield strength of 110000 psi (approximately 758 MPa).
It is one of the commonly used steel grades with higher strength levels in the API 5CT standard, suitable for well conditions with strict mechanical performance requirements, but not recommended for acidic environments containing hydrogen sulfide (H ₂ S).
API 5CT certified quality! P110 oil casing has a tensile strength of 800-950MPa and an elongation at break of over 38%. It can be used in geothermal wells and marine engineering. Click to inquire and enjoy factory price direct supply!
API 5CT P110 Oil Tubing Chemical Composition
| Element | Content Requirement (%) | Notes |
|---|---|---|
| Carbon (C) | 0.34–0.43 | Increases strength, but must be controlled to avoid brittleness |
| Manganese (Mn) | ≤1.90 | Enhances hardenability |
| Phosphorus (P) | ≤0.030 | Harmful element; must be strictly controlled |
| Sulfur (S) | ≤0.030 | Prone to form MnS inclusions, affecting resistance to SCC |
| Chromium (Cr) | - | May be added in trace amounts |
| Molybdenum (Mo) | 0.15–0.25 | Key alloying element, significantly improves strength and hardenability |
| Vanadium (V), Titanium (Ti), etc. | Trace | Refines grain size and improves toughness |
API 5CT P110 Casing Steel Pipe Mechanical Properties
| Item | Requirement | Service Environment Compatibility Recommendation |
|---|---|---|
| Minimum Yield Strength | 758 MPa (110,000 psi) | Suitable for high-stress conditions in deep and ultra-deep wells, ensuring structural stability |
| Maximum Yield Strength | 965 MPa (140,000 psi) | Avoid exceeding the upper limit to prevent material embrittlement and maintain safety margin |
| Minimum Tensile Strength | 862 MPa (125,000 psi) | Meets strength requirements under complex tensile-compressive cyclic loading |
| Elongation | Typically ≥18% | Ensures sufficient ductility to reduce fracture risk, especially under dynamic loads |
| Hardness | No upper limit specified; however, it is recommended to control below 30 HRC | Strictly maintain hardness below 30 HRC to significantly reduce the risk of sulfide stress cracking (SSC) in H₂S-containing environments |
API 5CT P110 Casing Steel Pipe Size Chart
| Outer Diameter | Wall Thickness | Weight | Grade | Threaded | Length | |
| in | mm | kg/m | lb/ft | |||
| 4 1/2″ | 114.3 | 14.14-22.47 | 9.50-11.50 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 5″ | 127 | 17.11-35.86 | 11.50-24.10 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 5 1/2″ | 139.7 | 20.83-34.23 | 14.00-23.00 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 6 5/8″ | 168.28 | 29.76-35.72 | 20.00-24.00 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 7″ | 177.8 | 25.30-56.55 | 17.00-38.00 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 7 5/8″ | 193.68 | 35.72-63.69 | 24.00-42.80 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 8 5/8″ | 219.08 | 35.72-72.92 | 24.00-49.00 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 9 5/8″ | 244.48 | 48.07-86.91 | 32.30-58.40 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 10 3/4″ | 273.05 | 48.73-97.77 | 32.75-65.70 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 11 3/4″ | 298.45 | 62.50-89.29 | 42.00-60.00 | P110 | LTC/STC/BTC | R1/R2/R3 |
| 13 3/8″ | 339.72 | 71.43-107.15 | 48.00-72.00 | P110 | LTC/STC/BTC | R1/R2/R3 |
API 5CT Grade P110 Casing Tubing Color Code
| Name | Casing | Coupling |
| P110 | A bright white band | Entire white coupling |
API 5CT P110 OCTG Casing Manufacturing Types
P110 casing and tubing can be manufactured using the following two processes:
- Seamless: Manufactured through hot rolling or cold drawing, resulting in a uniform structure and high pressure resistance. This type is used for most P110 products.
- Electric Resistance Welded (ERW): Steel plates are formed into tubular shapes through high-frequency welding. Strict weld quality control is required, making it suitable for some medium-to-low pressure deep well applications.
Note: Although both methods can produce P110, seamless tubing is the mainstream choice in practical applications due to its higher strength requirements.
P110 Steel Pipe Heat Treatment Types
To ensure a balance between high strength and good toughness, P110 steel pipes must undergo overall full length quenching and tempering treatment (Q):
- Heat treatment method: Full tube body, full length quenching+tempering (Q)
- Prohibited use: Normalizing (N) or normalizing+tempering (N&T) is not suitable for P110 steel grade
- Purpose: To improve the yield strength and tensile strength of materials, optimize the microstructure (such as forming tempered martensite), and enhance the ability to resist fatigue and collapse
- Special requirement: For ERW welded pipes, local heat treatment is required in the weld area to eliminate residual stress and ensure consistent performance
Heat treatment is a key step in P110 acceptance, and it is necessary to verify whether the heat treatment status is marked as "Q" during procurement.
Reference Inspection for P110 Casing and Tubing
To ensure the quality of P110 product, the following key tests need to be performed:
- Tensile test: Verify whether the yield strength and tensile strength meet the standards
- Hardness testing: Brinell (HBW) or Rockwell C (HRC) hardness testing, with no upper limit specified, but Rockwell C shall be used as the arbitration method in case of disputes
- Impact test: Some orders require Charpy impact test to evaluate low-temperature toughness
- Non destructive testing (NDT):
- Ultrasonic testing (UT): detecting internal defects in the pipe body
- Electromagnetic interference (EMI) testing: detecting surface and near surface cracks
- Hydrostatic pressure test: Verify the sealing and pressure bearing capacity of the pipe body
- Flattening Test: Evaluating Plastic Deformation Capacity
- Sulfide Stress Corrosion Cracking (SSC) Test: Although not mandatory, it is recommended to conduct additional testing in high H ₂ S environments
According to API 5CT 11th edition (released in 2023), NDT testing has become one of the mandatory requirements.
API 5CT P110 Casing Tubing Connection Type, Ends and Couplings
Thread type (compliant with API 5B standard):
- SC (Short Round Thread Casing): Short round thread, commonly used standard connection
- LC (Long Round Thread Casing): Long round thread for better sealing
- BC (Buttress Thread Casing): With a skewed ladder thread, it has stronger resistance to torsion and tension, making it suitable for deep wells
End processing form:
- PL (Plain End): Flat head, used for welding connections
- EU (External Upset): Adding thickness to enhance connection strength
- NU (Non Usset): Not thickened, suitable for light load conditions
Coupling:
Usually made of carbon steel or alloy steel, with internal threads, used to connect two sleeves
The surface shall not have defects such as folding, cracks, scars, etc., and the threads shall be smooth and free of burrs
API 5CT P110 Oilfield Tubing Supplier
API 5CT P110 OCTG Test and inspection
API 5CT P110 Certificate
FAQ
What is P110 pipe made of?
API 5CT P110 pipe is primarily made of carbon steel or alloy steel, with specific chemical composition designed to achieve high strength and durability for demanding oil and gas well applications. The key alloying element that defines its performance is molybdenum (Mo), which significantly enhances strength and hardenability.
What is the yield strength of P110?
API 5CT P110 pipe has a minimum yield strength of 758 MPa (110,000 psi), with a maximum allowable yield strength of 965 MPa (140,000 psi).
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