High Collapse and High Performance Steel Grades

High collapse (HC) and high performance (HP) steel grades developed specifically for challenging drilling environments.

U. S. Steel Tubular Products High Collapse (HC) and High Performance (HP) steel grades are all manufactured to meet API specification 5CT:

  • L80 HC is a controlled yield strength product with demonstrated collapse resistance exceeding the minimum values for standard API L80.
  • L80 HP is a controlled yield strength product with the highest demonstrated collapse resistance and with the added benefit of a higher than minimum internal yield pressure than standard API L80.
  • N80 HC is a product with a demonstrated collapse resistance exceeding the minimum values for standard API N80.
  • N80 HP is a product with the highest demonstrated collapse resistance exceeding the minimum internal yield pressure for standard API N80.
  • P110 HC is a product with a demonstrated collapse resistance exceeding the minimum values for standard API P110.
  • P110 HP is a product with the highest demonstrated collapse resistance exceeding the minimum internal yield pressure for standard API P110.
  • Q125 HC is manufactured to API specification 5CT. This is a product with a demonstrated collapse resistance exceeding the minimum values for standard API Q125.
  • Q125 HP is a product with a higher demonstrated collapse resistance, exceeding the minimum internal yield pressure for standard API Q125.
  • Q125 XHP is a product with the highest demonstrated collapse resistance, exceeding the minimum internal yield pressure for standard API Q125.
  • USS HCK55 is an ERW hot-finished proprietary U. S. Steel casing grade for “High Collapse” K55 applications. Inspections are the same as for API K55 with through-wall hardness testing on each yield-tensile test. Collapse testing is required for each run on the first, middle and last heat.
*U. S. Steel Tubular Products ERW pipe is HFW as defined by API 5L.
Product Minimum Yield Strength Maximum Yield Strength Minimum Tensile Strength Maximum Hardness
L80 HC 80,000 psi 95,000 psi 95,000 psi 23.0 HRC
L80 HP 85,000 psi 95,000 psi 95,000 psi 23.0 HRC
N80 HC 80,000 psi 110,000 psi 100,000 psi None
N80 HP 95,000 psi 110,000 psi 100,000 psi None
P110 HC 110,000 psi 140,000 psi 125,000 psi None
P110 HP 125,000 psi 140,000 psi 130,000 psi None
Q125 HC 125,000 psi 150,000 psi 135,000 psi Hardness variation requirement
Q125 HP 135,000 psi 150,000 psi 140,000 psi Hardness variation requirement
Q125 XHP 135,000 psi 150,000 psi 140,000 psi Hardness variation requirement
USS HCK 55 55,000 psi 95,000 psi 95,000 psi 21.0 HRC