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API 5CT K55 CASING
API 5CT K55 CASING
API 5CT K55 CASING
API 5CT K55 CASING
API 5CT K55 CASING
API 5CT K55 CASING
API 5CT K55 CASING
API 5CT K55 CASING

API 5CT K55 CASING

API 5CT K55 Casing Tubing is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacture API 5CT K55 Casing Tubing in accordance with the SY/T6194-96 standard, it is available as short thread type and long thread type supplied with their couplings.
Tubing pipe: OD with 2 7/8",3 1/2",4" and 4 1/2".
Casing pipe:OD with 5",5 1/2",6 5/8", 7",7 5/8",8 5/8",9 5/8",10 3/4",11 3/4",13 3/8",16" and 20"
Product Introduction
Technical data
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Product Introduction
API 5CT K55 casing pipe is a type of casing pipe used in oil and gas exploration and production. It is made of steel and has a yield strength of 379 MPa (55,000 psi) and a minimum tensile strength of 655 MPa (95,000 psi).Class K55 tubing is also referred to as general purpose tubing and is typically used for shallow to medium depth wells. It has high corrosion resistance and is suitable for sour gas service. The chemical composition of API 5CT K55 tubing typically consists of carbon, manganese, silicon, phosphorus, sulphur, chromium, nickel and copper.

Pipe Process of API 5CT K55 Casing
Round Pipe →  pipe inspection  → NDT inspection MPI → End Threading → Thread Inspection → Coupling Threading lnspection  → NDT inspection MPI ( coupling) → Phosphating (for coupling) → Coupling power Make up → Hydrostatic test → Drift test → Doping and Protectors Application  → Coating  → Measurement of  Length and Weight → Colour Identification → Marking → Packing → Warehousing
 

API 5CT K55 CASING TUBING SPECIFICATIONS

API 5CT K55 Casing Tubing Available Sizes 2 3/8″, 2 7/8″ and 3 ½” Outer Diameter
API 5CT K55 Casing Tubing Grades J55, J55-FBNAU, N80, L80, P110
API 5CT K55 Casing Tubing 1 1/4 “ – 2 1/16” Nom.
API 5CT K55 Casing Tubing Standards API SPEC 5CT
K55 API 5CT Casing Tubing Model in Common Use 2-3/8", 2-7/8", 3-1/2", 4", 4-1/2"
API 5CT K55 Casing Tubing Length Range R1(6.10-7.32m), R2(8.53-9.75m), R3(11.58-12.8m)
API 5CT K55 Casing Tubing Steel Grade (Casing Grades, Tubing Grades) J55, K55, N80-1, N80-Q, L80, P110
K55 API 5CT Casing Tubing Type of Screw Thread Non upset threaded end(NUE), External upset threaded end(EUE)
API 5CT K55 Casing Tubing Specialties
  • Drifting (Full-length, or just ends)
  • Threading
  • Heat treating
  • External upset
  • Hydrostatic Testing
  • Couplings – EUE, AB Modified, turned down, special clearance couplings
  • Coating to customer specifications
  • Full third-party inspection capabilities (EMI, SEA, and Weld Line)
  • Pup Joints
Technical data

API 5CT K55 Casing Tubing Chemical Composition

Group Grade Type C Mn Mo Cr Ni max. Cu max. P max. S max. Si max.
min. max. min. max. min. max. min. max.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 H40 - - - - - - - - - - - 0.03 0.03 -
J55 - - - - - - - - - - - 0.03 0.03 -
K55 - - - - - - - - - - - 0.03 0.03 -
N80 1 - - - - - - - - - - 0.03 0.03 -
N80 Q - - - - - - - - - - 0.03 0.03 -
R95 - - 0.45 c - 1.9 - - - - - - 0.03 0.03 0.45
2 M65 - - - - - - - - - - - 0.03 0.03 -
  L80 1 - 0.43 a - 1.9 - - - - 0.25 0.35 0.03 0.03 0.45
  L80 9Cr - 0.15 0.3 0.6 0.9 1.1 8 10 0.5 0.25 0.02 0.01 1
  L80 13Cr 0.15 0.22 0.25 1 - - 12 14 0.5 0.25 0.02 0.01 1
  C90 1 - 0.35 - 1.2 0.25 b 0.85 - 1.5 0.99 - 0.02 0.01 -
  T95 1 - 0.35 - 1.2 0.25 d 0.85 0.4 1.5 0.99 - 0.02 0.01 -
  C110 - - 0.35 - 1.2 0.25 1 0.4 1.5 0.99 - 0.02 0.005 -
3 P110 e - - - - - - - - - - 0.030 e 0.030 e -
4 Q125 1 - 0.35   1.35 - 0.85 - 1.5 0.99 - 0.02 0.01 -
a The carbon content for L80 may be increased up to 0.50 % maximum if the product is oil-quenched. 
b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness is less than 17.78 mm. 
c The carbon content for R95 may be increased up to 0.55 % maximum if the product is oil-quenched.
d The molybdenum content for T95 Type 1 may be decreased to 0.15 % minimum if the wall thickness is less than 17.78 mm. 
e For EW Grade P110, the phosphorus content shall be 0.020 % maximum and the sulfur content 0.010 % maximum. 
NL = no limit. Elements shown shall be reported in product analysis.
 

API 5CT Gr. k55 Casing Mechanical Properties

Standard Type Tensile Strength
MPa
Yield Strength
MPa
Hardness
Max.
API SPEC 5CT API 5Ct Casing J55 ≥517 379 ~ 552 ----
API 5Ct Casing K55 ≥517 ≥655 ---
API 5Ct Casing N80 ≥689 552 ~ 758 ---
API 5Ct Casing L80(13Cr) ≥655 552 ~ 655 ≤241HB
API 5Ct Casing P110 ≥862 758 ~ 965 ----
 

API 5CT K55 Casing Tubing Tensile & Hardness Requirement

Group Grade Type Total elongation under load % Yield strength MPa Tensile strength min. MPa Hardness a max. Specified wall thickness mm Allowable hardness variation b HRC
min. max .   HRC HBW
1 2 3 4 5 6 7 8 9 10 11
1 H40 - 0.5 276 552 414 - - - -
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 - - - -
R95 - 0.5 655 758 724 - - - -
2 M65 - 0.5 448 586 586 22 235 - -
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 1 0.5 621 724 689 25.4 255 ≤ 12.70 12.71 to 19.04 19.05 to 25.39 ≥ 25.40 3.0 4.0 5.0 6.0
T95 1 0.5 655 758 724 25.4 255 ≤ 12.70 12.71 to 19.04 19.05 to 25.39 ≥ 25.40 3.0 4.0 5.0 6.0
C110 - 0.7 758 828 793 30 286 ≤ 12.70 12.71 to 19.04 19.05 to 25.39. ≥ 25.40 3.0 4.0 5.0 6.0
3 P110 - 0.6 758 965 862 - - - -
4 Q125 1 0.65 862 1034 931 b - ≤ 12.70 12.71 to 19.04 ≥ 19.05 3.0 4.0 5.0
aIn case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. 
bNo hardness limits are specified, but the maximum variation is restricted in accordance with 7.8 and 7.9 of API Spec. 5CT.
 

API 5CT K55 Casing Tubing Features












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