API 5CT C110 acid resistant oil casing is a high-strength, sulfide stress cracking (SSC) resistant petroleum casing designed specifically for extreme working conditions such as high sulfur, high pressure, and ultra deep wells. It belongs to one of the most stringent steel grades in the API 5CT standard. It is widely used in high H ₂ S oil and gas fields, shale gas wells, and deep-sea drilling, with excellent mechanical properties and corrosion resistance, which can effectively ensure the safety and long-term stability of underground operations.
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API 5CT C110 Sour Service Casing & Tubing Color Code Table
| Steel Grade | Color Marking (End Paint) |
|---|---|
| C110 | White + Red Band |
API 5CT C110 Casing Tubing Chemical Composition Table
| Element | Requirement (%) | Notes |
|---|---|---|
| C (Carbon) | ≤0.35 | Limits hardenability to prevent cracking |
| Mn (Manganese) | ≤1.20 | Enhances strength and hardenability |
| P (Phosphorus) | ≤0.020 | Harmful element, strictly limited |
| S (Sulfur) | ≤0.005 | Causes hot shortness, must be ultra-low |
| Cr (Chromium) | 0.40–1.50 | Forms passive film, improves corrosion resistance |
| Mo (Molybdenum) | 0.25–1.00 | Increases hardenability and SSC resistance |
| Ni (Nickel) | ≤0.99 | Improves low-temperature toughness |
API 5CT C110 Petroleum Casing Pipe Mechanical Properties Table
| Property | Requirement |
|---|---|
| Yield Strength (YS) | 758–828 MPa (minimum 110 ksi) |
| Tensile Strength (TS) | ≥793 MPa |
| Hardness | ≤30 HRC or 286 HB |
| Elongation (A) | ≥12.5% (gauge length 50 mm) |
| Charpy Impact Energy (0°C) | Transverse ≥40 J, Longitudinal ≥86 J |
API 5CT C110 Casing for Sour Service Size Chart & Tolerances (Per API 5CT 11th Edition)
| Outside Diameter (mm) | Wall Thickness (mm) | Length (m) | OD Tolerance | WT Tolerance | Weight Tolerance |
|---|---|---|---|---|---|
| 114.3–508 | 6.35–15.88 | R1: 4.88–7.62 R2: 8.23–9.14 R3: >9.14 |
±0.75% D | +12.5% / -10% t | ±6.5% |
API 5CT C110 Oilfield Casing Manufacturing Types & Heat Treatment
| Item | Description |
|---|---|
| Manufacturing Process | Seamless pipe (hot-rolled or cold-drawn) |
| Heat Treatment Type | Quenching + High-Temperature Tempering (Tempered Martensite/Sorbite) |
| Microstructure | Tempered sorbite for optimal balance of strength and toughness |
| Applicable Standards | API 5CT, ISO 11960, NACE MR0175 |
API 5CT C110 Deep Well Casing Connection Types, Ends, and Couplings
| Thread Type | Abbreviation | Features | Application |
|---|---|---|---|
| Short Round Thread | STC | Moderate sealability, requires thread compound | Shallow wells, general use |
| Long Round Thread | LTC | Higher connection strength | Medium-depth wells |
| Buttress Thread | BTC | High tensile/compressive strength, self-locking | Deep, high-pressure wells |
| Premium Thread (Metal-to-Metal Seal) | XC or Proprietary (e.g., VAM, Hydril) | Gas-tight seal, high reliability | Ultra-deep, high-sour, HPHT wells |
API 5CT C110 Oilfield Casing Pipes Reference Inspection Requirements
Each C110 pipe undergoes the following inspections before delivery:
Hydrostatic Test: 100% body pressure tested, held ≥5 seconds
Non-Destructive Testing (NDT): Ultrasonic Testing (UT) + Eddy Current Testing (ET)
Tensile Test: Sampled per heat batch to verify YS and TS
Impact Test: Charpy V-notch, 3 specimens each transverse and longitudinal at 0°C
Hardness Test: Minimum 3 points per pipe
Chemical Analysis: Heat analysis + product analysis
Inspection standards: API 5CT, ISO 9001, NACE MR0175.
API 5CT C110 Casing pipe factory
API 5CT C110 Petroleum Casing Pipe Test and Inspection
API 5CT C110 Oil Well Drilling Tube Certificate
FAQ
What is the difference between P110 and C110?
The key difference between API 5CT P110 and C110 is that C110 is a high-strength steel grade specifically designed to resist hydrogen sulfide (H₂S) corrosion, while P110 is a general-purpose high-strength steel grade that does not have acid resistance.
What is the ISO equivalent of API 5CT?
The international standard equivalent of API 5CT is ISO 11960.
This standard, officially titled ISO 11960: Petroleum and natural gas industries - Steel pipes for use as casing or tubing for wells, was developed by the International Organization for Standardization (ISO). Its technical content is highly consistent with API 5CT, ensuring mutual recognition and compatibility of manufacturing, inspection, and performance requirements for oil well casing and tubing worldwide.
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