API SPEC 5CT
This is a world oil casing standard released by American Petroleum Institute, mainly used for oil pipe, tubing and casing production.API SPEC 5CT for Oil Transportation
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％ |
||
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 |
|
Chemical Composition:
|
Standard codes
|
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 |
0.20～0.35 |
1.25～1.50 |
≤0.020 |
≤0.015 |
≤0.15 |
≤0.20 |
≤0.20 |
|
|
≤0.020 |
|
N80 (36 Mn2V) |
0.34～0.38 |
0.20～0.35 |
1.45～1.70 |
≤0.020 |
≤0.015 |
≤0.15 |
|
|
|
0.11～0.16 |
≤0.020 |
|
|
L80(13Cr) |
0.15～0.22 |
≤1.00 |
0.25～1.00 |
≤0.020 |
≤0.010 |
12.0～14.0 |
≤0.20 |
≤0.20 |
|
|
≤0.020 |
|
|
P110 (30CrMo) |
0.26～0.35 |
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 |
≤0.020 |
|
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