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