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 |
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| Tubing & Casing |
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 |
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| Standard |
| API SPEC 5CT |
| |
| Application |
| Seamless steel tubes for oil casing and tubing in oil wells |
| |
| Grade |
| J55, K55, N80-1, N80, L80, P110, C75-2, C95, C90, T95, Q125, with both API Connection of STC, LTC & BTC and Premium Connection of HSM, HSC & GT etc. |
| |
| Diamensional Tolerances |
Outer diameter |
Wall thickness |
Tube sizes(mm) |
Tolerances(mm) |
Tolerances(mm) |
＜114.3 |
±0.79 |
±12.5% |
|
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| Mechanical Properties |
Standard |
Grade |
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 |
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| Chemical Composition |
Standard |
Grade |
Chemical Compositions (%) |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Mo |
V |
Al |
API SPEC 5CT |
J55K55 |
0.34
～0.39 |
0.20
～0.35 |
1.25
～1.50 |
≤0.020 |
≤0.015 |
≤0.15 |
≤0.20 |
≤0.20 |
|
|
≤0.020 |
(37Mn5) |
N80 |
0.34
～0.38 |
0.20
～0.35 |
1.45
～1.70 |
≤0.020 |
≤0.015 |
≤0.15 |
|
|
|
0.11
～0.16 |
≤0.020 |
(36 Mn2V) |
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 |
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 |
(30CrMo) |
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