OCTG Tubing And Casing
API series tubing and casing
API series tubing and casing mainly refer to the implementation of American Petroleum Association API SPEC 5CT standard steel pipe, mainly used in the exploration of oil , natural gas and other resources. The tubing is used to extract oil or gas from oil wells and the casing used to fix the well bore and insulate the annuals and rock formation.
Applicable standards and technical requirements
API SPEC 5CT Specification for casing and tubing
ISO 11960 Petroleum and natural gas industries-steel pipe for use as casing or tubing for wells
GB/T 19830 Petroleum and natural gas industries-tubing and casing
Mechanical Property
Grade | Type | Total Elongation under load | Yield strength/Mpa | Tensile strength/Mpa | Hardness Max | Specified wall thickness mm | Aloow hardness changes(b)HRC | ||
Min | Max | Min | HRC | HBW | |||||
H40 | - | 0.5 | 276 | 552 | 414 | - | - | - | - |
J55 | - | 0.5 | 379 | 552 | 655 | - | - | - | - |
K55 | - | 0.5 | 379 | 552 | 655 | - | - | - | - |
N80 | 1 | 0.5 | 552 | 758 | 689 | - | - | - | - |
Q | 0.5 | - | - | - | - | ||||
R95 | - | 0.5 | 655 | 758 | 724 | - | - | - | - |
M65 | - | 0.5 | 448 | 586 | 586 | 22 | 235 | - | - |
L80 | 1 | 0.5 | 621 | 724 | 689 | 23 | 241 | - | - |
9Cr | 23 | 241 | - | - | |||||
13Cr | 23 | 241 | - | - | |||||
C90 | 1 | .05 | 621 | 724 | 689 | 25.4 | 255 | ≤12.70 | 3.0 |
12.71~19.04 | 4.0 | ||||||||
19.05~25.39 | 5.0 | ||||||||
≥25.40 | 6.0 | ||||||||
T95 | 1 | .05 | 655 | 758 | 724 | 25.4 | 255 | ≤12.70 | 3.0 |
12.71~19.04 | 4.0 | ||||||||
19.05~25.39 | 5.0 | ||||||||
≥25.40 | 6.0 | ||||||||
C110 | - | 0.7 | 758 | 828 | 793 | 30 | 289 | ≤12.70 | 3.0 |
12.71~19.04 | 4.0 | ||||||||
19.05~25.39 | 5.0 | ||||||||
≥25.40 | 6.0 | ||||||||
P110 | - | 0.6 | 758 | 965 | 862 | - | - | - | - |
