Alloy KHN20JUS (ЭК11)

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    • Designation

    Name The value
    Designation GOST Cyrillic ХН20ЮС
    Designation GOST Latin XH20JuC
    Transliteration HN20YuS
    By chemical elements CrNi20AlPb
    Name The value
    Designation GOST Cyrillic ЭК11
    Designation GOST Latin EK11
    Transliteration EhK11
    By chemical elements -

    Description

    Alloy KHN20JUS used: for the manufacture of heaters, industrial electric furnaces and various electric heating devices with maximum operating temperatures up to +1100 °C.

    Note

    The heat resisting alloy in an oxidizing atmosphere, a vacuum. More heat resistant than Fe-alloys.

    Standards

    Name Code Standards
    Classification, nomenclature and General rules В30 GOST 10994-74
    Wire, steel, alloy В73 GOST 12766.1-90, TU 14-1-4098-86
    Tape В34 GOST 12766.2-90
    Bars and shapes В32 GOST 12766.3-90, GOST 12766.4-90, TU 14-11-245-88
    Blanks. Of the workpiece. Slabs В31 TU 14-1-1213-75

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe N Al Ti Ca Ce Zr
    TU 14-1-1213-75 ≤0.12 ≤0.02 ≤0.03 0.3-0.85 19-21 2-2.7 19.5-21.5 Rest - 1-1.5 - - - -
    GOST 10994-74 ≤0.08 ≤0.02 ≤0.03 0.3-0.8 19-21 2-2.7 19.5-21.5 Rest ≤0.15 1-1.5 ≤0.2 ≤0.1 ≤0.1 ≤0.2
    Fe is the basis.
    According to GOST 10994-74, the chemical composition is given for an alloy of grade ХН20ЮС. The content of zirconium, cerium and calcium is calculated.
    According to TU 14-1-1213-75, the chemical composition is given for an alloy of grade ХН20ЮС (ЭК11). In the alloy of calcium and cerium are introduced by calculation as technological additives of 0.10% each and chemical analysis is not determined. The presence in the metal of a residual amount of other rare earth elements and zirconium is not a rejection sign. When melting alloy XH20YC in arc furnaces, deviations from the mass fraction of nickel by + 0.050%, aluminum by ± 0.20% are allowed.

    Mechanical properties

    Section, mm σU, MPa d5, % d
    Cold-rolled steel strip of 0.2-3.2 mm in the delivery state according to GOST 12766.2-90
    ≤736 ≥25 -
    Wire cold-drawn heat-treated in the delivery condition according to GOST 12766.1-90 (the value is δ200)
    ≤780 - ≥25

    Description mechanical marks

    Name Description
    σU Limit short-term strength
    d5 Elongation after rupture
    d Elongation after rupture

    Physical characteristics

    Temperature r, kg/m3 R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
    20 7700 990-1070 - 480
    1000 - - 19 -
    800 - - - 640

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    l Coefficient of thermal conductivity
    R UD. the resistivity
    С Specific heat

    Technological properties

    Name The value
    Microstructure Austenitic structure with a mass fraction up to 3% of ferrite.
    Magnitnoi Non-magnetic alloy. In the presence of ferrite alloy subfertility.
    Operating temperature Recommended maximum working temperature of the heating element from 900 °C at a thickness of 0.2 mm to 1100 °C at a thickness ≥ 6.0 mm.
    Survivability Survivability at a temperature of 1150 °C is not less than 100 hours.