Specifications
Range
Out Diameter
1.315"- 20"
Wall Thickness
0.133"-0.500"
Length
3.0m-18m
Products: API SPEC 5CT Seamless Steel Tubes
Applications: It is widely used for oil casing and tubing in oil wells
Grades: J55，N80，L80，P110 etc.
Dimension 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％ |
|
|
≥114.3 |
－0.5％，＋1％ |
||
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 | - | - |
