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Alloy 28

  • Material

    Alloy 28, 28Cr, UNS N08028, W.Nr. 1.4563

  • Overview

    Alloy 28, is a cold hardened nickel-based alloy intended for corrosion resistance in highly sour (H2S) environments with moderate chloride content, requiring high strength up to 350°F.Alloy28 offers increased resistance to the effects of H2S relative to stainless steels allowing its use as downhole tubular components, packers, and other subsurface equipment in sour wells with high-pressure and high-temperature (HPHT) conditions and Acid Gas Injection (AGI) wells. In addition, it has a high resistance to pitting and crevice corrosion in the presence of chlorides. However, all environmental factors, including H2S, CO2, temperature, pH, and chloride concentration, should be considered before final material selection.

  • Application

    Alloy 28 is used in the chemical and petrochemical processing industry. Alloy 28 tubes are cold worked to high strength levels for downhole service in moderately corrosive deep sour gas wells.

  • Chemical Composition (wt% as per ASTM B622)

    Material

    Fe

    Ni

    Cu

    Cr

    Mo

    Alloy 28

    Balance

    30.0-34.0

    0.6-1.4

    26.0-28.0

    3.0-4.0

    Material

    C

    Mn

    Si

    P

    S

    Alloy 28

    ≤0.03

    ≤2.5

    ≤1.0

    ≤0.030

    ≤0.030

  • Mechanical Property

    Alloy 28 in the solution annealed condition as per ASTM B668

    Material

    Tensile strength

    ksi (MPa)

    Yield strength at

    0.2 offset ksi (MPa)

    Elongation in 2”

    % min.

    Reduction of area

    % min.

    N08028

    ≥73 (500)

    ≥31 (214)

    ≥40


  • Available Process

    (1) Hot formed, annealed, descaled

    (2) Cold worked and bright annealed

    (3) Cold worked, bright annealed, polished (MP, EP, CP etc.)

  • Common Tests

    Chemical composition

    Tension

    Hardness

    Flaring

    Flange

    Flattening

    Micro structure

    Hydrostatic

    NDT

    Intergranular Corrosion

    Surface condition

    Shape and dimension

    Positive Material Identification

  • Product Forms

    Form

    Size range

    Capillary tube

    OD 0.15 ~ 6.0 mm

    WT 0.015 ~ 1.5 mm

    Thin wall & Ultra thin wall seamless tube

    OD6.0 ~80.0 mm

    WT 0.05 ~4.5 mm

    Micro ID and heavy thick wall seamless tube

    OD3.0 ~50.0 mm

    ID 0.30 ~5.0 mm

    Precision conic seamless tube

    Bigger end: OD3.0 - 426.0mm

    Smaller end: OD2.5 - 346.0mm

    WT: 0.15 - 40.0mm

    HP /UHP BA+ tube

    EP tube

    OD 1.0 ~ 76 mm

    WT 0.10 ~ 10.0 mm

    Small caliber precision seamless tube

    OD6.0 ~89 mm

    WT 0.50 ~9.0 mm

    Profiled seamless tube

    Build to drawing

    Build to specification

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