• API 5CT Casing
  • API 5CT Casing
  • API 5CT Casing
  • API 5CT Casing

API 5CT Casing

Application: Used as the structural retainer for the walls of oil, gas wells

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  • Introduction
  • Specification
  • Application
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Introduction:

Application: Used as the structural retainer for the walls of oil, gas wells

Specification: OD: 4 1/2’’ ~ 20’’ (114.3mm ~ 508mm)

WT: 0.205’’ ~ 0.635’’ (5.21mm ~ 16.13mm)

LENGTH: R1, R2, R3

Standard: API 5CT J 55/K55/N80/C75/L80/C90/T95/Q125

Process Type: Seamless (SMLS), Electric Resistance Welded (ERW)

End: Beveled, Square Cut, With LTC/STC/BTC/VAM Connection

Surface: Anti-corrosion Water Based Paint

Packing: Protection Caps in both end, Waterproof Paper Wrapped, Two Tags

Specification:

Tolerance

Types of steel tubes Outer Diameter Wall Thickness
Cold-rolled tubes Tube sizes(mm) Tolerances(mm) Tolerances(mm)
<114.3 ±0.79 -12.5%

Chemical Composition

Standard Grade Chemical compositions(%)
API SPEC 5CT J55 C Si Mn P S Cr Ni Cu Mo V
K55 0.34~0.39 0.20~0.35 1.25~1.50 ≤0.020 ≤0.015 ≤0.15 ≤0.20 ≤0.20 / /
N80 0.34~0.38 0.20~0.35 1.45~1.70 ≤0.020 ≤0.015 ≤0.15 / / / 0.11~0.16
L80 0.15~0.22 ≤1.00 0.25~1.00 ≤0.020 ≤0.010 12.0~14.0 ≤0.20 ≤0.20 / /
P110 0.26~0.395 0.17~0.37 0.40~0.70 ≤0.020 ≤0.010 0.80~1.10 ≤0.20 ≤0.20 0.15~0.25 ≤0.08

Mechanical Properties

Grade Type Total elongation under load (%) Yield strength (min) Yield strength (max) Tensile strength min Mpa Hardness Max (HRC) Hardness Max(HBW)
J55 - 0.5 379 552 517 - -
K55 - 0.5 379 552 655 - -
N80 1 0.5 552 758 689 - -
N80 Q 0.5 552 758 689 - -
L80 1 0.5 552 655 655 23 241
L80 9Cr 0.5 552 655 655 23 241
L80 13Cr 0.5 552 655 655 23 241
C90 - 0.5 621 724 689 25.4 255
C95 - 0.5 655 758 724 - -
T95 - 0.5 655 758 724 25.4 255
P110 - 0.6 758 965 862 - -
Q125 All 0.65 862 1034 931 - -

 
 
 
 
 
 

Application:

Used as the structural retainer for the walls of oil, gas wells

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