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API 5CT N80 CASING
API 5CT N80 CASING
API 5CT N80 CASING
API 5CT N80 CASING
API 5CT N80 CASING
API 5CT N80 CASING
API 5CT N80 CASING
API 5CT N80 CASING

API 5CT N80 CASING

API 5CT Grade N80 type Q casing pipe is a medium grade in casing pipe products and has been widely used in oil and gas well drilling activities. Grade N80 has two level N80 type 1 and N80 type Q, more materials available like 9Cr-80 and 13Cr-80.
Standards: API SPEC 5CT
Outer Diameter: 5 1/2”, 7”, 7 5/8”, 9 5/8”, 13 5/8”
Product Introduction
Technical data
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Product Introduction
API 5CT N80 is a casing pipe used in oil and gas exploration and production. It is the standard specification for seamless casing with a yield strength of 80,000 psi.

The chemical composition of API 5CT N80 casing typically includes elements such as carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium and copper. The exact composition may vary, depending on the specific product requirements and the manufacturing process used.

The mechanical properties of API 5CT N80 casing include a minimum yield strength of 80,000 psi, a minimum tensile strength of 95,000 psi, and a maximum hardness of 22 HRC. it has a minimum elongation of 10%. These properties are important to ensure the integrity and reliability of the casing in the demanding oil and gas environment.
Technical data

N80 TUBING SIZES, CASING DRIFT SIZES AND AVAILABLE GRADES

OD Wall PE # / ft T&C # / ft Collar API Drift Available Grades
2.375″ .190 4.44 4.7 EUE,
AB MOD
1.901 J55, J-FBNAU, N80, L80, P110
2.875″ .217 6.17 6.5 EUE,
AB MOD
2.347 J55, J-FBNAU, N80, L80, P110
3.5″ .254 8.81 9.3 EUE,
AB MOD
2.867 J55, J-FBNAU, N80, L80, P110
 

Casing Sizes And Grades, Casing And Tubing Dimensions

Pipe Casing Sizes, Oilfield Casing Sizes & Casing Drift Sizes
Outer Diameter (Casing Pipe Sizes) 4 1/2"-20", (114.3-508mm)
Standard Casing Sizes 4 1/2"-20", (114.3-508mm)
Thread Type Buttress thread casing, Long round thread casing, Short round thread casing
Function It can protect the tubing pipe.
 

Oil Tube For Petroleum And Natural Gas Industries

Name of Pipes

Specification

Steel Grade

Standard

 

D

(S)

(L)

 

 

(mm)

(mm)

(m)

Petroleum Casing Pipe

127-508

5.21-16.66

6-12

J55. M55. K55.
L80. N80. P110.

API Spec 5CT (8)

Petroleum Tubing

26.7-114.3

2.87-16.00

6-12

J55. M55. K55.
L80. N80. P110.

API Spec 5CT (8)

Coupling

127-533.4

12.5-15

6-12

J55. M55. K55.
L80. N80. P110.

API Spec 5CT (8)


API 5CT N80 Casing Tubing Chemical Composition, mass fraction (%)

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 N80 Casing Tubing Mechanical Properties

Standard Type Tensile Strength
MPa
Yield Strength
MPa
Hardness
Max.
API SPEC 5CT J55 ≥517 379 ~ 552 ----
K55 ≥517 ≥655 ---
N80 ≥689 552 ~ 758 ---
L80(13Cr) ≥655 552 ~ 655 ≤241HB
P110 ≥862 758 ~ 965 ----
 
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
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. 
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9 of API Spec. 5CT.


API 5CT N80 Casing Tubing Steel color code

Name J55 K55 N80-1 N80-Q L80-1 P110
Casing a bright green band two bright green bands a bright red band a bright red band + a green band a red band + a brown band a bright white band
Coupling entire green coupling + a white band entire green coupling entire red coupling entire red coupling + a green band entire red coupling + a brown band entire white coupling
 

API 5CT N80 Casing Tubing is offered with a free length range from 8 to 13m on basis of the SY/T6194-96 norm. However, it is also available no less than 6m length and its quantity should be no more than 20%API 5CT N80 Casing Tubing Features


API 5CT N80 Casing Tubing Packaging

In compliance with the regulation of SY/T6194-96, the domestic API 5CT N80 Casing Tubing should be strapped with steel wire or belt. The protection ring should be screwed on the exposed part of the thread of each casing pipe and its coupling to well protect the thread.












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