Seamless steel tubes for oil casing and tubing, , API SPEC 5L, API 5L Gr.B, API 5L X42, API 5L X52, API 5L X60, API 5L X65, API 5L X70
Seamless steel tubes for oil casing and tubing application for onshore and offshore Oil & Gas applications in the domains of Exploration, Production and Processing.
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 | 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 | ||
This International Standard specifies the technical delivery conditions for steel pipes (casing, tubing, plain end casing liners and pup-joints) and accessories. This International Standard is applicable to the following connections in accordance with ISO 10422 or API Spec 5B:
- short round thread casing (STC);
- long round thread casing (LC);
- buttress thread casing (BC);
- extreme-line casing (XC);
- non-upset tubing (NU);
- external upset tubing (EU);
- integral joint tubing (IJ).
For such connections, this International Standard specifies the technical delivery conditions for couplings and thread protection.
For pipes covered by this International Standard, the sizes, masses, wall thicknesses, grades and applicable end finishes are defined.
This International Standard may also be applied to tubulars with connections not covered by ISO/API standards.
Mechanical properties:
Standard codes | Models of steel tubes | Tensite strength(MPa) | Yield strength(MPa) | Elongation() | Hardness |
API SPEC 5CT | J55 | ≥517 | 379552 | check the table | |
K55 | ≥517 | ≥655 | |||
N80 | ≥689 | 552758 | |||
L80(13Cr) | ≥655 | 552655 | ≤241HB | ||
P110 | ≥862 | 758965 |
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) | 0.340.39 | 0.200.35 | 1.251.50 | ≤0.020 | ≤0.015 | ≤0.15 | ≤0.20 | ≤0.20 | ≤0.020 | ||
N80 (36 Mn2V) | 0.340.38 | 0.200.35 | 1.451.70 | ≤0.020 | ≤0.015 | ≤0.15 | 0.110.16 | ≤0.020 | ||||
L80(13Cr) | 0.150.22 | ≤1.00 | 0.251.00 | ≤0.020 | ≤0.010 | 12.014.0 | ≤0.20 | ≤0.20 | ≤0.020 | |||
P110 (30CrMo) | 0.260.35 | 0.170.37 | 0.400.70 | ≤0.020 | ≤0.010 | 0.801.10 | ≤0.20 | ≤0.20 | 0.150.25 | ≤0.08 | ≤0.020 | |
