Carcasas
Products: API SPEC 5CT Seamless Steel Tubes
Applications: It is widely used for oil casing and tubing in oil wells
Grades: J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110, Q125, K55 D10, L80 D10.
Special Service: Sweet Service, Sour Service, Anti-H2S, NACE MR0175/ISO15156
Produce Process: Hot Rolled, Cold Drawn, Hot Expanded.
Accessories: Pup Joint, Coupling (Coupling Stock), Blast Joint, Crossover etc.
Connection: API connection and Premium connection, like TPCQ, HSM etc.
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 | - | - |