API 5CT C110 Casing For Sour Service
API 5CT C110 is a high-strength, Sour Service grade of casing and tubing. It is specifically designed for high-pressure, deep-well environments containing Hydrogen Sulfide (H2S). Belonging to Group 4 of the API 5CT specification, C110 requires a precise Quench and Temper (Q&T) heat treatment to ensure it achieves a 110 ksi yield strength while maintaining excellent resistance to Sulfide Stress Cracking (SSC).
Looking for high-quality, cost-effective C110? Direct from the manufacturer, ensuring excellent sulfur resistance while optimizing your procurement costs. Click to get the latest price list.
API 5CT C110 Casing & Tubing Color Code
| Grade | Body Band Color | Coupling Color |
| C110 | 1 White + 2 Brown bands | White coupling with 2 Brown stripes |
API 5CT C110 Oil Well Drilling Casing Pipe Chemical Composition (%)
| Element | C | Mn | P | S | Si | Cr | Mo |
| Content (%) | 0.25 - 0.35 | 0.40 - 1.20 | ≤ 0.020 | ≤ 0.005 | ≤ 0.45 | 0.40 - 1.50 | 0.25 - 0.85 |
Note: Trace elements like V, Ti, and B may be added to improve hardenability.
API 5CT C110 Seamless Oil Pipe Mechanical Property
The defining characteristic of C110 is its controlled hardness, which is essential for H2S resistance.
| Property | Requirement |
| Yield Strength | 758 - 862 MPa (110 - 125 ksi) |
| Tensile Strength | ≥ 793 MPa (115 ksi) |
| Maximum Hardness | ≤ 30 HRC (or 286 HBW) |
| Hardness Variation | Strict limits on hardness fluctuations within a single joint |
API 5CT C110 Oilfield Casing Pipes Size Chart (Common Casing Sizes)
C110 is predominantly used as casing in high-pressure wells.
| OD (Inch) | OD (mm) | Wall Thickness (mm) | Weight (lb/ft) |
| 5" | 127.00 | 9.19 - 12.70 | 18.00 - 24.10 |
| 5-1/2" | 139.70 | 9.17 - 12.70 | 20.00 - 26.00 |
| 7" | 177.80 | 10.36 - 15.11 | 29.00 - 41.00 |
| 9-5/8" | 244.48 | 11.99 - 15.11 | 47.00 - 58.40 |
API 5CT C110 Oil And Gas Casing Pipes Pipe Tolerance
C110 follows the general API 5CT tolerance standards:
| Parameter | Tolerance |
| Outside Diameter (OD) | ≥ 4-1/2": +1.00% / -0.50% |
| Wall Thickness (WT) | -12.5% (Minimum limit) |
| Weight (Single Joint) | +6.5% / -3.5% |
| Straightness | ≤ 0.2% of total length |
API 5CT C110 Oil Well Drilling Tube Features:
High-Strength Sour Resistance: The highest strength API grade available for
H2SH2S
service.
Uniform Microstructure: Requires a highly uniform tempered martensite structure.
Controlled Hardness: Hardness is capped at 30 HRC to prevent hydrogen embrittlement.
API 5CT C110 oil country tubular goods Applications:
Deep Sour Gas Wells: Wells with high
H2SH2S
concentrations combined with high pressure.
High-Pressure Operations: Used where lower sour-service grades (like C90 or T95) lack the necessary burst/collapse strength.
Test and Inspection of API 5CT C110
Due to the critical nature of sour service, C110 undergoes more rigorous testing than standard grades:
Sulfide Stress Cracking (SSC) Test: Conducted per NACE TM0177; this is the mandatory test for sour service validation.
Full-length Ultrasonic Testing (UT): To detect internal flaws in the pipe body.
Magnetic Particle Inspection (MPI): To check for cracks on the pipe surface and ends.
Rigorous Hardness Testing: Each joint is tested for through-wall hardness to ensure no "hard spots" exist.
Hydrostatic Test: To verify the pressure integrity and sealing of the pipe.
API 5CT C110 VS P110 Comparison Table
While both have a 110 ksi yield strength, they are designed for completely different environments:
| Feature | C110 | P110 |
| API Group | Group 4 (High-Strength Sour Service) | Group 3 (General High-Strength) |
| Environment | Sour Service (Contains H2S ) | Sweet Service (No or minimal H2S ) |
| Hardness Limit | Strictly capped (Max 30 HRC) | No specific maximum limit |
| Chemistry | Highly alloyed (High Cr, Mo) | Flexible, focused mainly on strength |
| Manufacturing Cost | Expensive (High heat-treat and test costs) | More economical |
| Safety Risk | Safe in H2S environments | High risk of brittle failure in H2S |
api 5ct c110 casing pipe test and inspection
API 5CT C110 oil well casing factory
FAQ
What is C110 material
API 5CT C110 is a high-strength, sour-service steel grade designed for casing in oil and gas wells.
What is the difference between P110 and C110
Operating Environment: C110 is specifically designed for acidic environments containing hydrogen sulfide (H2S); P110 is only suitable for normal (sulfur-free) "sweet" environments.
Hardness Control: C110 requires strict hardness control, with an upper limit of 30 HRC, to prevent hydrogen embrittlement; P110 has no upper limit requirement for hardness.
Safety: In acidic environments, P110 will rapidly undergo stress corrosion cracking (SSC) leading to fracture, while C110 can operate safely.
Hot Tags: api 5ct c110 casing for sour service, China api 5ct c110 casing for sour service manufacturers, suppliers, 316 Stainless Steel Welded Pipe
You Might Also Like
Send Inquiry