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Alloy U520

  • Material

    Alloy U520, Udimet® alloy 520

    Note that Udimet® alloy 520 is a registered trade mark of Special Metals Corporation group of companies.

  • Overview

    Alloy 520 is a precipitation hardenable nickel base superalloy with an exceptional combination of high-temperature mechanical properties, corrosion resistance and forgeability characteristics. 

  • Application

    Alloy 520 is developed for use in the 1400-1700°F (760-927°C) temperature range, the alloy has excellent structural stability and unusually good fabricability. The primary application for alloy 520 is blading for aircraft and land-based gas turbines. And sheets and bolts for industrial and marine use.

  • Chemical Composition (wt%)

    Material

    Ni

    Co

    Cr

    Ti

    C

    Mn

    Si

    Alloy 520

    Balance

    11.0-14.0

    18.0-20.0

    2.90-3.25

     0.02-0.06

    ≤0.40

    ≤0.50

    Material

    Al

    Mo

    W

    B

    Fe

    P

    S

    Alloy 520

    1.80-2.30

    5.50-7.00

     0.80-1.20

    0.004-0.010

    ≤1.0

    ≤0.020

    ≤0.020

  • Microstructure

    After the conventional heat treatments, Alloy 520 microstructure is composed of a Ni-Cr-Co (μ) rich matrix, which is hardened by fine (approximately 0.1-μm size) Ni3(Al, Ti) gamma prime (μ') precipitates. Grain boundaries are decorated by M23C6 carbides. Stringerlike primary MC carbides may also be present within the grains. 

  • Mechanical Property

    1000 hours rupture strength of precipitation hardened Alloy 520

    Temperature

    Rupture strength

    °F

    °C

    ksi

    MPa

    1200

    649

    85

    585

    1300

    704

    69

    475

    1400

    760

    50

    345

    1500

    816

    33

    230

    1600

    871

    22

    150

  • Available Process

    (1) Hot formed, solution annealed, descaled

    (2) Cold worked and bright annealed

    (3) 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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