API Spec 5CT
Name: API SPEC 5CT Seamless Steel Tubes
Applications: It is widely used for oil casing and tubing in oil wells
Models: J55，N80，L80，P110 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％ | ||
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 | |
Tubing
| Size Designation | Weight Lb/ft | Outside Diameter | Wall Thickness | Nominal Weight | Type End Finish | |||||||
| Grade | ||||||||||||
| Nonupset | Ex-upset | mm | mm | Nonupset | Ex-upset | J-55 | L-80 | N-80 | C-90 | T-95 | P-110 | |
| T & C | T & C | T & C | T & C | |||||||||
| 23/8” | 4 | -- | 60.32 | 4.24 | 5.95 | -- | PN | PN | PN | PN | PN | -- |
| 4.6 | 4.7 | 60.32 | 4.83 | 6.85 | 6.99 | PNU | PNU | PNU | PNU | PNU | PNU | |
| 5.8 | 5.95 | 60.32 | 6.45 | 8.63 | 8.85 | -- | PNU | PNU | PNU | PNU | PNU | |
| 6.6 | -- | 60.32 | 7.49 | 9.82 | -- | -- | P | -- | P | P | -- | |
| 7.35 | 7.45 | 60.32 | 8.53 | 10.94 | 11.09 | -- | PU | -- | PU | PU | -- | |
| 27/8” | 6.4 | 6.5 | 73.02 | 5.51 | 9.52 | 9.67 | PUN | PNU | PNU | PNU | PNU | PNU |
| 7.8 | 7.9 | 73.02 | 7.01 | 11.61 | 11.76 | -- | PNU | PNU | PNU | PNU | PNU | |
| 8.6 | 8.7 | 73.02 | 7.82 | 12.8 | 12.95 | -- | PNU | PNU | PNU | PNU | PNU | |
| 9.35 | 9.45 | 73.02 | 8.64 | 13.91 | 14.06 | -- | PU | -- | PU | PU | -- | |
| 10.5 | -- | 73.02 | 9.96 | 15.63 | -- | -- | P | -- | P | P | -- | |
| 11.5 | -- | 73.02 | 11.18 | 17.11 | -- | -- | P | -- | P | P | -- | |
| 31/2” | 7.7 | -- | 88.9 | 5.49 | 11.46 | -- | PN | PN | PN | PN | PN | -- |
| 9.2 | 9.3 | 88.9 | 6.45 | 13.69 | 13.84 | PNU | PNU | PNU | PNU | PNU | PNU | |
| 10.2 | -- | 88.9 | 7.34 | 15.18 | -- | PN | PN | PN | PN | PN | -- | |
| 12.7 | 12.95 | 88.9 | 9.52 | 18.9 | 19.27 | -- | PNU | PNU | PNU | PNU | PNU | |
| 14.3 | -- | 88.9 | 10.92 | 21.28 | -- | -- | P | -- | P | P | -- | |
| 15.5 | -- | 88.9 | 12.09 | 23.07 | -- | -- | P | -- | P | P | -- | |
| 17 | -- | 88.9 | 13.46 | 25.3 | -- | -- | P | -- | P | P | -- | |
| 4” | 9.5 | -- | 101.6 | 5.74 | 14.14 | -- | PN | PN | PN | PN | PN | PN |
| 10.7 | 11 | 101.6 | 6.65 | -- | 16.37 | PU | PU | PU | PU | PU | PU | |
| 13.2 | -- | 101.6 | 8.38 | 19.64 | -- | -- | P | -- | P | P | -- | |
| 16.1 | -- | 101.6 | 10.54 | 23.96 | -- | -- | P | -- | P | P | -- | |
| 18.9 | -- | 101.6 | 12.7 | 28.13 | -- | -- | P | -- | P | P | -- | |
| 22.2 | -- | 101.6 | 15.49 | 33.04 | -- | -- | P | -- | P | P | -- | |
| 41/2” | 12.6 | 12.75 | 114.3 | 6.88 | 18.75 | 18.97 | PUN | PNU | PNU | PNU | PNU | PNU |
| 15.2 | -- | 114.3 | 8.56 | 22.62 | -- | -- | P | -- | P | P | -- | |
| 17 | -- | 114.3 | 9.65 | 25.3 | -- | -- | P | -- | P | P | -- | |
| 18.9 | -- | 114.3 | 10.92 | 28.13 | -- | -- | P | -- | P | P | -- | |
| 21.5 | -- | 114.3 | 12.7 | 32 | -- | -- | P | -- | P | P | -- | |
| 23.7 | -- | 114.3 | 14.22 | 35.27 | -- | -- | P | -- | P | P | -- | |
| 26.1 | -- | 114.3 | 16 | 38.84 | -- | -- | P | -- | P | P | -- | |
| Note：P-plain end；N-nonupset thread and coupling；U-upset thread and coupling | ||||||||||||
Casing
| Size Designation | Weight Lb/ft | Outside Diameter | Wall Thickness | Type End Finish | |||||||||
| Grade | |||||||||||||
| ln. | mm | ln. | mm | H-40 | J-55 K-55 | M-65 | L-80C-95 | N-80 | C-90T-95 | P-110 | Q-125 | ||
| 7 5/8” | 24.00 | 7.625 | 193.68 | 0.300 | 7.62 | PS | -- | -- | -- | -- | -- | -- | -- |
| 26.40 | 7.625 | 193.68 | 0.328 | 8.33 | -- | PSLB | PSLB | PLB | PLB | PLB | PLB | -- | |
| 29.70 | 7.625 | 193.68 | 0.375 | 9.53 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 33.70 | 7.625 | 193.68 | 0.430 | 10.92 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 39.00 | 7.625 | 193.68 | 0.500 | 12.70 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 42.80 | 7.625 | 193.68 | 0.562 | 14.27 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 45.30 | 7.625 | 193.68 | 0.595 | 15.11 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 47.10 | 7.625 | 193.68 | 0.625 | 15.88 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 51.20 | 7.625 | 193.68 | 0.687 | 17.45 | -- | -- | -- | -- | -- | P | -- | -- | |
| 55.30 | 7.75 | 193.68 | 196.85 | 19.05 | -- | -- | -- | -- | -- | P | -- | -- | |
| 7 3/4” | 46.10 | 8.625 | 219.08 | 0.595 | 15.11 | -- | -- | -- | P | P | P | P | P |
| 8 5/8” | 24.00 | 8.625 | 219.08 | 0.264 | 6.71 | -- | PS | PS | -- | -- | -- | -- | -- |
| 28.00 | 8.625 | 219.08 | 0.304 | 7.72 | PS | -- | PS | -- | -- | -- | -- | -- | |
| 32.00 | 8.625 | 219.08 | 0.352 | 8.94 | PS | PSLB | PSLB | -- | -- | -- | -- | -- | |
| 36.00 | 8.625 | 219.08 | 0.400 | 10.16 | -- | PSLB | PSLB | PLB | PLB | PLB | PSLB | -- | |
| 40.00 | 8.625 | 219.08 | 0.450 | 11.43 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 44.00 | 8.625 | 219.08 | 0.500 | 12.70 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 49.00 | 9.625 | 244.48 | 0.557 | 14.15 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 9 5/8” | 32.30 | 9.625 | 244.48 | 0.312 | 7.92 | PS | -- | -- | -- | -- | -- | -- | -- |
| 36.00 | 9.625 | 244.48 | 0.352 | 8.94 | PS | PSLB | PSLB | -- | -- | -- | -- | -- | |
| 40.00 | 9.625 | 244.48 | 0.395 | 10.03 | -- | PSLB | PSLB | PLB | PLB | PLB | -- | -- | |
| 43.50 | 9.625 | 244.48 | 0.435 | 11.05 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 47.00 | 9.625 | 244.48 | 0.472 | 11.99 | -- | -- | PLB | PLB | PLB | PLB | PLB | PLB | |
| 53.50 | 9.625 | 244.48 | 0.545 | 13.84 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 58.40 | 9.625 | 244.48 | 0.595 | 15.11 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 59.40 | 9.625 | 244.48 | 0.609 | 15.47 | -- | -- | -- | -- | -- | P | -- | -- | |
| 64.90 | 9.625 | 244.48 | 0.672 | 17.07 | -- | -- | -- | -- | -- | P | -- | -- | |
| 70.30 | 9.625 | 244.48 | 0.734 | 18.64 | -- | -- | -- | -- | -- | P | -- | -- | |
| 75.60 | 9.625 | 244.48 | 0.797 | 20.24 | -- | -- | -- | -- | -- | P | -- | -- | |
| P-plain end；S-short round thread；L-long round thread；B-buttress thread。 | |||||||||||||
| Size Designation | Weight Lb/ft | Outside Diameter | Wall Thickness | Type End Finish | |||||||||
| Grade | |||||||||||||
| ln. | mm | ln. | mm | H-40 |
J-55 K-55 |
M-65 |
L-80 C-95 |
N-80 | C-90T-95 | P-110 | Q-125 | ||
| 10 3/4” | 32.75 | 10.75 | 273.05 | 0.279 | 7.09 | PS | -- | -- | -- | -- | -- | -- | -- |
| 40.50 | 10.75 | 273.05 | 0.350 | 8.89 | PS | PSB | PSB | -- | -- | -- | -- | -- | |
| 45.50 | 10.75 | 273.05 | 0.400 | 10.16 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 51.00 | 10.75 | 273.05 | 0.450 | 11.43 | -- | PSB | PSB | PSB | PSB | PSB | PSB | -- | |
| 55.50 | 10.75 | 273.05 | 0.495 | 12.57 | -- | -- | PSB | PSB | PSB | PSB | PSB | -- | |
| 60.70 | 10.75 | 273.05 | 0.545 | 13.84 | -- | -- | -- | -- | -- | PSB | PSB | PSB | |
| 65.70 | 10.75 | 273.05 | 0.595 | 15.11 | -- | -- | -- | -- | -- | PSB | PSB | PSB | |
| 73.20 | 10.75 | 273.05 | 0.672 | 17.07 | -- | -- | -- | -- | -- | P | -- | -- | |
| 79.20 | 10.75 | 273.05 | 0.734 | 18.64 | -- | -- | -- | -- | -- | P | -- | -- | |
| 85.30 | 10.75 | 273.05 | 0.797 | 20.24 | -- | -- | -- | -- | -- | P | -- | -- | |
| 11 3/4” | 42.00 | 11.75 | 298.45 | 0.333 | 8.46 | PS | -- | -- | -- | -- | -- | -- | -- |
| 47.00 | 11.75 | 298.45 | 0.375 | 9.53 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 54.00 | 11.75 | 298.45 | 0.435 | 11.05 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 60.00 | 11.75 | 298.45 | 0.489 | 12.42 | -- | PSB | PSB | PSB | PSB | PSB | PSB | PSB | |
| 65.00 | 11.75 | 298.45 | 0.534 | 13.56 | -- | -- | -- | P | P | P | P | P | |
| 71.00 | 11.75 | 298.45 | 0.582 | 14.78 | -- | -- | -- | P | P | P | P | P | |
| 13 3/8” | 48.00 | 13.375 | 339.73 | 0.330 | 8.38 | PS | -- | -- | -- | -- | -- | -- | -- |
| 54.50 | 13.375 | 339.73 | 0.380 | 9.65 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 61.00 | 13.375 | 339.73 | 0.430 | 10.92 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 68.00 | 13.375 | 339.73 | 0.480 | 12.19 | -- | PSB | PSB | PSB | PSB | PSB | PSB | -- | |
| 72.00 | 13.375 | 339.73 | 0.514 | 13.06 | -- | -- | -- | PSB | PSB | PSB | PSB | PSB | |
| P-plain end；S-short round thread；L-long round thread；B-buttress thread。 | |||||||||||||
