• API 5CT N80 casing and tubing pipe
• API 5CT K55 casing and tubing pipe
• API 5CT J55 casing and tubing pipe
• EN10028-2 16Mo3 Boiler and Pressure Vessel steel Plate Notch impact energy
• EN10028-2 P265GH Pressure vessels steel equivalents
• EN 10210 S355J2H low alloy carbon structural steel
• EN 10210 S355J0H steel hollow materials
• GB/T 18248 34CrMo4
• GB/T 18248 35CrMo alloy steel
• 30CrMo steel Heat treatment, 30CrMo steel tube/pipe

K55 API 5CT casing or tubing

K55 has better mechanical and thermal fatigue resistance and crack resistance than K55. For a thermal production well, the heavy wall K55 casing is appropriate instead of J55 casing. The former has a better thermal fatigue resistance property than the latter.

In present sales, the selling price of theses two types is generally kept the same, their application is very similar. In the oil drilling, K55 API 5CT casing or tubing is a relatively common type.

K55 Casing Application
alloy tube in oil, aerospace, chemical, electric power, boiler, military industry and other.
industries has a wide range of USES of reason because good changes more on the
mechanical properties of the alloy pipe. API Round Thread Casing Couplinga The dimension classification for the coupling is the same as the size designation for the pipe on which the coupling is used.
b Groups 1, 2 as well as 3-Tolerance on outdoors diameter W: +_ 1 % however not more than +_ 3,18 mm.
c Group 4-Tolerance on outside size W: +_ 1 % yet not above + 3,18, -1,59 mm.
d Tolerance on diameter of recess, Q, for all teams: + 0,79, 0 mm.