API 5CT oil casing specification defines various steel grades to meet the specific requirements of different well conditions. Each steel grade has distinct mechanical properties and is suitable for particular well environments. In this article, United Steel Industry will introduce the most common API 5CT oil casing steel grades.
H40:
Minimum Yield Strength: 40,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 60,000 psi
J55:
Minimum Yield Strength: 55,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 75,000 psi
K55:
Minimum Yield Strength: 55,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 95,000 psi
N80 Type 1:
Minimum Yield Strength: 80,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 100,000 psi
N80Q:
Minimum Yield Strength: 80,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 110,000 psi
L80 Type 1:
Minimum Yield Strength: 80,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 95,000 psi
L80 Type 9Cr:
Minimum Yield Strength: 80,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 95,000 psi
Chromium (Cr) content: 8.00-10.00%
C90:
Minimum Yield Strength: 90,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 105,000 psi
T95:
Minimum Yield Strength: 95,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 110,000 psi
P110:
Minimum Yield Strength: 110,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 125,000 psi
Q125:
Minimum Yield Strength: 125,000 psi
Maximum Yield Strength: None specified
Minimum Tensile Strength: 135,000 psi
These steel grades are designed to cover a range of well conditions, including different depths, pressures, and temperatures. The choice of steel grade depends on factors such as well depth, reservoir characteristics, and the specific conditions the casing will encounter during drilling and production operations. It's essential to select the appropriate steel grade to ensure the integrity and performance of the casing in the given well environment.
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