Alloy ЭК79

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  • Alloy EC79

    • Designation

    Name The value
    Designation GOST Cyrillic ЭК79
    Designation GOST Latin EK79
    Transliteration EhK79
    By chemical elements -

    Description

    Alloy ЭК79 used: for the manufacture of forgings and stampings parts, blades centrifugal compressor wheel; turbine disks and high-pressure compressor gas turbine engine (GTE), operating at temperatures up to +800 °C and briefly up to +850 °C.

    Note

    Alloy high strength high heat resistance.

    Standards

    Name Code Standards
    Blanks. Of the workpiece. Slabs В31 TU 14-131-824-90

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu Al V B Ti Mo Nb W Ce Co Nd Mg La
    TU 14-131-824-90 0.04-0.08 ≤0.01 ≤0.015 ≤0.4 10-12 ≤0.3 Rest ≤1 ≤0.07 2.8-3.3 0.4-0.8 ≤0.01 2.4-3 4-5 2.5-3 2-3 ≤0.015 12.5-16 ≤0.005 ≤0.1 ≤0.08
    Ni is the basis.
    According to TU 14-131-824-90 the chemical composition is given for the alloy EC79-ID. Lanthanum, neodymium, boron, cerium and magnesium are introduced into the metal by calculation and chemical analysis are not determined. In the finished metal, deviations in the content of titanium, aluminum, niobium and vanadium by ± 0.10%, carbon -0.010%, boron +0.005% are allowed. The introduction of niodime is allowed together with cerium in the composition of misch metal in an amount corresponding to the data in the table.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
    Forgings (washers). Annealing in air 1130-1150 °C (delay of 4-8 h) + 1 Aging at 840-870 °C (exposure 6 h), air cooling + 2 Aging at 770-790 °C (aging 10-16 h), air cooling
    ≥895 ≥1270 ≥13 ≥14 ≥343 311-376

    Description mechanical marks

    Name Description
    sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
    σU Limit short-term strength
    d5 Elongation after rupture
    y The relative narrowing
    KCU Toughness
    HB Brinell hardness number