Tubo galvanizado por inmersión en caliente
Tubería de acero pre galvanizada
Tubo de acero de aleación transparente
Tubería de acero de aleación soldada
Tubería soldada de acero inoxidable
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％ |
||
Chemical Composition
| Standard | Grade |
Chemical compositions（％） |
|||||||||
|
API SPEC 5CT |
J55 |
C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V |
| K55 |
0.34～0.39 |
0.20～0.35 |
1.25～1.50 |
≤0.020 |
≤0.015 |
≤0.15 |
≤0.20 |
≤0.20 |
/ | / | |
|
N80 |
0.34～0.38 |
0.20～0.35 |
1.45～1.70 |
≤0.020 |
≤0.015 |
≤0.15 |
/ | / | / |
0.11～0.16 |
|
|
L80 |
0.15～0.22 |
≤1.00 |
0.25～1.00 |
≤0.020 |
≤0.010 |
12.0～14.0 |
≤0.20 |
≤0.20 |
/ | / | |
|
P110 |
0.26～0.395 |
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 |
|
Mechanical properties
| Grade | Type |
Total elongation under load (%) |
Yield strength (min) |
Yield strength (max) |
Tensile strength min Mpa |
Hardness Max (HRC) |
Hardness Max (HBW) |
| J55 | - |
0.5 |
379 | 552 | 517 | - | - |
| K55 | - |
0.5 |
379 | 552 | 655 | - | - |
| N80 | 1 |
0.5 |
552 | 758 | 689 | - | - |
| N80 | Q |
0.5 |
552 | 758 | 689 | - | - |
| L80 | 1 |
0.5 |
552 | 655 | 655 | 23 | 241 |
|
L80 |
9Cr |
0.5 |
552 | 655 | 655 | 23 | 241 |
|
L80 |
13Cr |
0.5 |
552 | 655 | 655 | 23 | 241 |
| C90 | - |
0.5 |
621 | 724 | 689 | 25.4 | 255 |
| C95 | - |
0.5 |
655 | 758 | 724 | - | - |
| T95 | - | 0.5 | 655 | 758 | 724 | 25.4 | 255 |
| P110 | - | 0.6 | 758 | 965 | 862 | - | - |
| Q125 | All | 0.65 | 862 | 1034 | 931 | - | - |
The casing is used to support the oil and gas wells of the steel pipe to ensure the completion of the whole well after the drilling process and normal operation. According to the drilling depth and geological conditions, each well has several layers of casing. The casing is cemented by cement. It is different from tubing and drill pipe. It can not be reused and consumes materials at one time. Therefore, the total casing consumption is over 70% of the well. According to the shell used, it can be divided into: conduit, surface casing, casing technology and oil casing.
