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    Well Casing & Tubing

    Casing Pipe, Drill Pipe


    Sizes:

    Out Diameter: 1.315"- 20"
    Wall Thickness: 0.133"-0.500"
    Length:R1(group1),R2(group2),R3(group3) 


    Grades: J55, K55, N80, L80, P110, S135


    Application:

    oil well extracting 

    borehole 

    borewell


    Types:

    Seamless Casing

    ERW Casing


    Connections:

    P (Plain end)

    STC (short threads)

    LTC (long threads)

    BTC (buttress threads)

    Premium gas-tight connectors

    Non-upset ends (NUE)

    External upset ends (EUE)

    Premium gas-tight connectors

    Others special connectors


    Chemical compositions of casing pipe

    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 of casing pipe

    Grade Type

    Total elongation 

    under load

     (%)

    Yield strength

     (min)Mpa

    Yield strength 

    (max)Mpa

    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 - -

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