API 5CT L80 13Cr Casing Pipe is a high-end, corrosion-resistant alloy (CRA) steel pipe belonging to Group 2 of the API 5CT specification. It is a martensitic stainless steel specifically designed for wells with high CO2 (carbon dioxide) concentrations.
Corrosion Resistance: The "13Cr" refers to its roughly 13% Chromium content, which provides excellent protection against "sweet corrosion" (weight-loss corrosion caused by wet CO2 gas).
Restricted Hardness: Like standard L80, it has a maximum hardness of 23 HRC to prevent Sulfide Stress Cracking (SSC).
Application: It is the industry standard for production strings in wet gas wells and high-temperature environments where standard carbon steel would fail rapidly.
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API 5CT L80 13Cr Specification Table
| Item | Details |
| Standard | API Spec 5CT |
| Steel Grade | L80 Type 13Cr |
| Group | Group 2 (Restricted yield/Hardness) |
| Heat Treatment | Quenched and Tempered (Q&T) |
| Service Environment | High CO2 environments (Sweet Service) |
Identification of Color Band for L80 13Cr
| Grade | Body Color Bands | Coupling Color |
| L80 13Cr | One Red + One Brown + One Yellow | Brown |
API 5CT L80 13Cr Chemical Composition Table
The defining feature of L80 13Cr is its 12.0% to 14.0% Chromium (Cr) content, which provides excellent resistance to uniform weight-loss corrosion in wet CO2 environments.
| Element | Content Range / Maximum (Weight %) |
| Carbon (C) | 0.15 - 0.22 |
| Manganese (Mn) | 0.30 - 1.00 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 12.00 - 14.00 |
| Nickel (Ni) | ≤ 0.50 |
| Copper (Cu) | ≤ 0.25 |
API 5CT L80 13Cr Mechanical Properties Table
L80 13Cr belongs to Group 2 of the API 5CT steel grades, characterized by "restricted yield strength" and "strict hardness control."
| Mechanical Property | US Customary (psi) | Metric / SI (MPa) |
| Yield Strength (Minimum) | 80,000 psi | 552 MPa |
| Yield Strength (Maximum) | 95,000 psi | 655 MPa |
| Tensile Strength (Minimum) | 95,000 psi | 655 MPa |
| Maximum Hardness | 23 HRC | 241 HBW |
| Elongation | Based on API Formula* | Based on API Formula* |
*Note: Minimum elongation depends on the cross-sectional area of the tensile specimen, usually requiring more than 15%.
API 5CT L80 13Cr Casing Size Table (Common Sizes)
| Nominal Size (in) | OD (mm) | Wall Thickness (mm) | Weight (lb/ft) | Drift Diameter (mm) |
| 4-1/2 | 114.30 | 6.35 | 11.60 | 99.21 |
| 5-1/2 | 139.70 | 7.72 | 17.00 | 121.87 |
| 7 | 177.80 | 9.19 | 26.00 | 156.24 |
| 9-5/8 | 244.48 | 11.99 | 47.00 | 216.53 |
Dimension and Tolerances Table
| Parameter | API 5CT Tolerance |
| Outside Diameter (OD) | < 4-1/2": ±0.031" / ≥ 4-1/2": -0.5% to +1.0% |
| Wall Thickness | -12.5% |
| Weight | -3.5% to +6.5% (Single Length) |
| Length | R1 (6.10-7.32m), R2 (8.53-9.75m), R3 (11.58-12.80m) |
| Straightness | < 0.2% of full length |
Connection Types, Ends, and Couplings
Ends: Mostly Threaded & Coupled (T&C).
Standard API Connections: LTC (Long Round Thread) and BTC (Buttress Thread).
Premium Connections: Because 13Cr is often used in high-pressure gas wells, Gas-Tight Premium Connections (like VAM, TenarisHydril equivalents) are extremely common to prevent molecular gas leaks.
Couplings: Must be L80 13Cr material, painted brown, and processed with the same Q&T standards.
Manufacturing Types
Seamless (SML): L80 13Cr is exclusively manufactured as Seamless. The high chromium content makes the material unsuitable for the longitudinal welding processes (ERW) used for lower grades.
Heat Treatment: Mandatory full-body Quenching and Tempering to achieve the required martensitic microstructure.
Reference Inspection for API 5CT L80-13Cr Casing
| Inspection Type | Description |
| Hardness Test | Mandatory on every joint to ensure < 23 HRC. |
| Hydrostatic Test | Testing for leaks at high pressures (crucial for gas wells). |
| NDT (Non-Destructive) | Mandatory Ultrasonic (UT) or Eddy Current to find internal flaws. |
| Visual Inspection | Check for surface imperfections, pits, or thread damage. |
| Drift Test | Ensuring a standard mandrel can pass through the full length. |
| Spectroscopic Analysis | To verify the 12%-14% Chromium content. |
API 5CT L80-13Cr Casing test equipments
API 5CT L80-13Cr oil well casing pipe factory
API 5CT L80-13Cr Casing Certificate
FAQ
What is the difference between L80-1, L80 9Cr, and L80 13Cr in API 5CT?
The main difference between these three types is their alloy content and the type of corrosion they are designed to resist. While they all share the same strength (80,000 psi yield), they are used in different well environments.
| Feature | L80 Type 1 | L80 9Cr | L80 13Cr |
| Material Type | Carbon Steel | Alloy Steel | Stainless Steel |
| Primary Protection |
H2S (Sour Service) |
Moderate CO2 | Severe CO2 |
| Cr Content | ~0% | 9% | 13% |
| Manufacturing | Seamless or ERW | Seamless only | Seamless only |
| Price | Low | Medium | High |
Can I use L80-13Cr in sour service?
yes, but with very strict limitations.
While L80-13Cr has the same hardness limit (max 23 HRC) as L80-1, it is not a dedicated sour service grade. Its primary job is resisting CO2, not
H2S.
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