Seamless Casing Pipe

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Seamless Casing Pipe

The seamless casing pipe is produced especially for use in oil well drilling to support the well wall during the drilling process and after the well completion. Thus, the drilling process and the whole oil well after well completion can be ensured working normally. The production standard of the product is API SPEC 5CT and the main steel grade includes J55, K55, N80, etc.

Dimensional Tolerance

TypeOutside Diameter (D)Wall Thickness (S)
Cold Drawn TubeOutside Diameter (mm)Allowable Tolerance (mm)Allowable Tolerance (mm)
<114.3±0.79-12.5 %



Chemical Composition

Steel GradeChemical Composition (%)
CSiMnPSCrNiCuMoV
J55K55(37Mn5)0.34 -0.390.20-0.351.25 -1.50≤0.020≤0.015≤0.15≤0.20≤0.20
N80(36 Mn2V)0.34-0.380.20-0.351.45-1.70≤0.020≤0.015≤0.15 0.11- 0.16

Mechanical Properties and Hardness Requirement

Standard Steel Grade Type Total Elongation under Load (%) Yield Strength (MPa) Tensile Strength(MPa) Max. Hardness Specified Wall Thickness (mm) Allowable Hardness Change (HRC)
Min. Max. Min. HRC HBW
API 5CT H40 - 0.5 276 552 414 - - - -
J55 - 0.5 379 552 517 - - - -
K55 - 0.5 379 552 655 - - - -
N80 1 0.5 552 758 689 - - - -

Liaocheng Yaxinda Steel Pipe Co.,Ltd. is an experienced seamless casing pipe manufacturer and supplier in China. We provide various types of products such as custom shaped cold drawn seamless tube, LSAW steel pipe, line pipe, and seamless fluid pipe.

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