tubing and casing couplings pipes

Tubing and casing couplings

Standard:API SPEC 5CT Standard.

Use: Seamless steel tubes for oil casing and tubing in oil and gas well. Casing pipe is the steel pipe to support the wall of oil and gas wells, divided into surface casing, protective casing and production casing.

Steel grade: J55, K55, N80, L80, C90, T95, P110, Q125

Size: 4 1/2”~20” for Seamless Casing

1.05”~4 1/2” for Seamless Tubing

Length: R1/R2/R3



Dimensional tolerances:



Types of

steel tubes

Outer diameter

Wall thickness

Cold-rolled tubes

Tube sizes(mm)

Tolerances(mm)

Tolerances(mm)

<114.3

¯0.79

-12.5%

≥114.3

-0.5%, +1%



Mechanical properties:



Standard

Models of steel tubes

Tensile strength (MPa)

Yield strength (MPa)

Elongation (%)

Hardness

API SPEC 5CT

J55

≥517

379~552

check the table

≤241HB

K55

≥517

≥655

N80

≥689

552~758

L80(13Cr)

≥655

552~655

P110

≥862

758~965



Chemical Composition:



Standard

Models of steel tubes

Chemical compositions (%)

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

V

Als

API SPEC 5CT

J55K55 (37Mn5)

0.34~ 0.39

0.2~ 0.35

1.25~ 1.5

≤0.02

≤0.015

≤0.15

≤0.20

≤0.20





≤0.02

N80 (36 Mn2V)

0.34~ 0.38

0.2~ 0.35

1.45~ 1.7

≤0.02

≤0.015

≤0.15







0.11~ 0.16

≤0.02

L80 (13Cr)

0.15~ 0.22

≤1.0

0.25~ 1.0

≤0.02

≤0.010

12.0~ 14.0

≤0.20

≤0.20





≤0.02

P110 (30CrMo)

0.26~ 0.35

0.17~ 0.37

0.40~ 0.7

≤0.02

≤0.010

0.8~1.1

≤0.20

≤0.20

0.15~ 0.25

≤0.08

≤0.02



Note: Also we can supply you pup joint and coupling (coupling stock and coupling blank) for tubing and Casing, as well as for weld pipe.