API L80 13Cr Casing vs API L80 Casing
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
API L80 13Cr Casing
Pipe & Tube Steel
L80 13Cr is the corrosion-resistant workhorse of the CRA casing family: a true martensitic stainless chemistry written into API 5CT (one of the few 5CT grades with a specified composition), built for sweet CO₂ corrosion that would pit and thin carbon-steel tubing in a few years.
Standards: AISI API 5CT L80 Type 13Cr · GB L80-13Cr (GB/T 19830)
API L80 Casing
Pipe & Tube Steel
L80 is the sour-service-capable API 5CT grade: same 80 ksi class as N80 but with a controlled yield window and a 23 HRC hardness cap that resists sulfide stress cracking. Type 1 is the standard Cr-free version; 9Cr and 13Cr types cover corrosive CO2 service.
Standards: AISI API 5CT L80 (Type 1) · GB L80 (GB/T 19830)
Chemical composition compared (%)
| Element | API L80 13Cr Casing | API L80 Casing |
|---|---|---|
| C | 0.15–0.22 | ≤0.43 (Type 1) |
| Si | ≤1.00 | — |
| Mn | 0.25–1.00 | ≤1.90 (Type 1) |
| P | ≤0.020 | ≤0.030 |
| S | ≤0.010 | ≤0.030 |
| Cr | 12.00–14.00 | — |
| Ni | ≤0.50 | — |
| Cu | ≤0.25 | — |
| Note | — | Hardness capped at 23 HRC for sour-service suitability |
Properties compared
| Property | API L80 13Cr Casing | API L80 Casing |
|---|---|---|
| Yield strength | 552–655 MPa (80–95 ksi) | 552–655 MPa (80–95 ksi, controlled band) |
| Tensile strength | ≥655 MPa (95 ksi) | ≥655 MPa (95 ksi) |
| Hardness | ≤23.0 HRC | ≤23 HRC |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: API L80 13Cr Casing · API L80 Casing. Substitution decisions for certified parts stay with the design authority.