Casing & Tubing
Standard：
API SPEC 5CT Standard of American Petroleum Institute
Steel Grade:
J55, K55, N80, L80, N80-1, N80Q P110 etc．
Diamensional 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 codes |
Models of steel tubes |
Tensite strength（MPa） |
Yield strength（MPa） |
Elongation（％） |
Hardness |
|
API SPEC 5CT |
J55 |
≥517 |
379～552 |
check the table |
|
|
K55 |
≥517 |
≥655 |
|
|
N80 |
≥689 |
552～758 |
|
|
L80(13Cr) |
≥655 |
552～655 |
≤241HB |
|
P110 |
≥862 |
758～965 |
|
Linepipe 
Standard：
API SPEC 5L——API Standard
GB/T9711.2——CNS
Usage:
Used as oxygen, water, and oil delivery pipe in oil and natural gas industry.
Main Steel Grade:
B X42 X52 X60 X65
Notice：
1．0.015％≤Altot＜0.06％；N≤0.012％；Al/N≥2/1；Cu≤0.25％；Ni≤0.30％；Cr≤0.30％；Mo≤0.10％
2．V＋Nb＋Ti≤0.15
3．X60、X65、X70after negotiationMo≤0.35％
| 
