API Sour Service Steel Grades
Steel grades for sour service environments that meet all API specifications
U. S. Steel Tubular Products steel grades developed for sour service environments meet all API specifications.
Sour Service Steel Grades offered by U. S. Steel Tubular Products:
- API L80 is manufactured to API specification 5CT. This is a controlled yield strength material with a hardness testing requirement. L80 is often used in wells with sour (H2S) environments.
- API C90 is an API controlled yield strength grade generally for use in sour condensate wells. Extensive hardness testing is required along with Sulfide Stress Corrosion Cracking (SSCC) testing per NACE Standard TM-0177, Method A. The minimum threshold stress required is 80% of specified minimum yield strength.
- API T95 is an API controlled yield strength grade, the same as API C95 and USS C95. Generally for use in sour condensate wells. Extensive hardness testing is required along with SSCC testing per NACE Standard TM-0177, Method A. The minimum threshold stress required is 80% of specified minimum yield strength.
- API C110 is a controlled yield strength grade generally used in deeper sour condensate wells. SSCC testing is required for each heat to meet a threshold stress of 85% of specified minimum yield strength.
| Product |
Minimum Yield Strength |
Maximum Yield Strength |
Minimum Tensile Strength |
Maximum Hardness |
| API L80 |
80,000 psi |
95,000 psi |
95,000 psi |
23.0 HRC |
| API C90 |
90,000 psi |
105,000 psi |
100,000 psi |
25.4 HRC mean |
| API T95 |
95,000 psi |
110,000 psi |
105,000 psi |
25.4 HRC mean |
| API C110 |
110,000 psi |
120,000 psi |
115,000 psi |
30.0 HRC mean |
For pipe sizes and grades not found in the section above, please contact U. S. Steel Tubular Products at 877-893-9461 with your inquiry.