General Purpose Steel Grades

United States Steel produces a variety of steel grades for a wide range of general purpose applications.

U. S. Steel Tubular Products offers a variety of steel grades to meet general-purpose application needs.

General Purpose Steel Grades offered by U. S. Steel:

  • API H40 is a general purpose pipe manufactured to API specification 5CT.
  • API J55 is a general purpose pipe manufactured to API specification 5CT. Similar to K55 except the minimum tensile strength is lower.
  • API K55 is a general purpose pipe manufactured to API specification 5CT. Usually, this grade is most often used in casing applications.
  • API N80 Type I is a lower cost alternative to standard Quench and Tempered API N80 (walls less than 0.500 inch). Charpy V-notch impact test absorbed energy results meet API SR16 and are lower than quenched-and-tempered N80.
  • API N80Q is a general purpose pipe manufactured to API specification 5CT using a quench and temper process.
  • API R95 is an API grade with the same strength range as T95 and USS C95, but without a hardness requirement. This grade is not generally considered for use in sour condensate wells since no hardness restrictions or testing are required and no Sulfide Stress Corrosion Cracking (SSCC) testing is required.
Product Minimum Yield Strength Maximum Yield Strength Minimum Tensile Strength Maximum Hardness
API H40 40,000 psi 80,000 psi 60,000 psi None
API J55 55,000 psi 80,000 psi 75,000 psi None
API K55 55,000 psi 80,000 psi 95,000 psi None
API N80 Type 1 80,000 psi 110,000 psi 100,000 psi None
API N80Q 80,000 psi 110,000 psi 100,000 psi None
API R95 95,000 psi 110,000 psi 105,000 psi None