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Alloy 90

  • Material

    Alloy 90,UNS N07090, W.Nr. 2.4632, 2.4969, GH4090

  • Overview

    Alloy 90 is a wrought nickel-chromium-cobalt base alloy strengthened by additions of titanium and aluminum. It has been developed as an age-hardenable creep- resisting alloy for service at temperatures up to 920°C (1688°F). The alloy has high tensile strength and creep resistance, good oxidation resistance and corrosion resistance in 815~870°C, high fatigue strength and good formability and weldability under the action of repeated cold and heating.

  • Application

    The alloy is used for turbine blades, discs, forgings, ring sections, fasteners, clamp, seal ring, elastic element and hot-working tools.

  • Chemical Composition (wt%)

    Fe

    Ni

    Co

    Cr

    Zr

    Ti

    Pb

    B

    Bi

    ≤1.50

    Balance

    15.0-21.0

    18.0-21.0

    ≤0.15

    2.00-3.00

    ≤0.0020

    ≤0.02

    ≤0.0001

    Cu

    C

    Al

    Mn

    Si

    P

    S

    Ag

     

    ≤0.20

    ≤0.13

    1.00-2.00

    ≤1.00

    ≤1.00

    ≤0.020

    ≤0.015

    ≤0.0005

  • Mechanical Property

    Tensile strength

    ksi (MPa) min.

    Yield strength at

    0.2 offset ksi (MPa) min.

    Elongation at fracture min.

    Reduction of Area min.

    170 (1175)

    109 (752)

    30%

    45%

  • Microstructure

    The main enhancement of the alloy is the γ′-Ni3(Al、Ti), which precipitates into different square particles in the grain, which is also visible in the grain boundary. The carbide is precipitated in a discontinuous strand in the grain boundary.

  • Available Process

    (1) Hot formed, solution annealed, descaled

    (2) Cold worked and bright annealed

    (3) Cold worked, annealed and descaled

    (4) Cold worked, polished (MP, EP etc.)

    (5) Cold worked, bright annealed, polished (MP, EP 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 0.08 ~ 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

    Bourdon tube

    Y40, Y50, Y60, Y70, Y100, Y150

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