 Standard：
API SPEC 5CT Standard of American Petroleum Institute
Application：
Seamless steel tubes for oil casing and tubing in oil wells
Model
N0．of steel tubes：
J55，N80，L80，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 |
|
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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