Oil country tubular goods (OCTG) is a family of seamless rolled products consisting of drill pipe, casing and tubing subjected to loading conditions according to their specific application.
This is summarized information from API Specification 5L.
| Data | PSL1 | PSL2 |
CVN impact (Charpy) testing | None required | Required for all grades |
Nondestructive inspection of seamless | Only when purchaser specifies SR4 | SR4 mandatory |
Certification | Certificates when specified per SR15 | Certificates (SR 15.1) mandatory |
Traceability | Traceable only until all tests are passed, unless SR15 is specified | Traceable after completion of tests (SR 15.2) mandatory |
Hydrostatic Test | Required | Required |
Note: Please refer to the specific Standard or Specification or contact us for more details.
API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.
The main steel grade of API 5CT:
API 5CT J55
API 5CT K55
API 5CT N80
API 5CT L80
API 5CT P110
Chemical Composition
| Grade | C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≤ | Ni≤ | Cu≤ | Mo≤ | V≤ | Als≤ |
| API 5CT J55 | 0.34-0.39 | 0.20-0.35 | 1.25-1.50 | 0.020 | 0.015 | 0.15 | 0.20 | 0.20 | / | / | 0.020 |
| API 5CT K55 | 0.34-0.39 | 0.20-0.35 | 1.25-1.50 | 0.020 | 0.015 | 0.15 | 0.20 | 0.20 | / | / | 0.020 |
| API 5CT 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 |
| API 5CT L80 | 0.15-0.22 | 1.00 | 0.25-1.00 | 0.020 | 0.010 | 12.0-14.0 | 0.20 | 0.20 | / | / | 0.020 |
| API 5CT J P110 | 0.26-035 | 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 |
Mechanical Properties of API 5CT
| Steel Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) |
| API 5CT J55 | 379-552 | ≥517 |
| API 5CT K55 | ≥655 | ≥517 |
| API 5CT N80 | 552-758 | ≥689 |
| API 5CT L80 | 552-655 | ≥655 |
| API 5CT P110 | 758-965 | ≥862 |
API Spec 5CT standard replaced by:
API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells
This product references:
API Spec 5B – Specification for Threading, Gauging, and Thread Inspection of Casing, Tubing, and Line Pipe Threads (US Customary Units) (Includes March 2004 Addendum)
ISO 10422:1993 – Petroleum and natural gas-industries; threading, gauging, and thread inspection of casing, tubing and line pipe threads; specification
This product replaces:
API 5CT – Specification for Casing and Tubing (U.S. Customary Units)
ISO 11960 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 5, Casing, tubing and drill pipe.
Seamless steel tubes for oil casing and tubing in oil wells
Model N0．of steel tubes:
J55，N80，L80，P110 etc．
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).
This International Standard specifies the technical delivery conditions for steel pipes (casing, tubing, plain end casing liners and pup-joints) and accessories.
| PSL | C, a | Mna | P | S | Si | V | Nb | Ti | Other | CEIIW | CEpcm |
| 1 | 0.24 | 1.40 | 0.025 | 0.015 | 0.45 | 0.10 | 0.05 | 0.04 | b,c | .043 | 0.025 |
| 2 | 0.28 | 1.40 | 0.03 | 0.03 | - | b | b | b | - | - | - |
API SPEC 5L is a international standard specifies requirements for the manufacture of two product specification levels (PSL 1 and PSL 2) of welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries.
Tel:
E-mai:
Skype:
