Alloy KH27JU5T (ЭИ626)

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    • Designation

    Name The value
    Designation GOST Cyrillic Х27Ю5Т
    Designation GOST Latin X27Ju5T
    Transliteration H27Yu5T
    By chemical elements Cr27Al5Te
    Name The value
    Designation GOST Cyrillic ЭИ626
    Designation GOST Latin EI626
    Transliteration EhI626
    By chemical elements -

    Description

    Alloy KH27JU5T used: for the manufacture of electric heating elements furnaces with maximum operating temperature 1350 °C; the heating elements and resistance elements.

    Note

    The heat resisting alloy in an oxidizing atmosphere containing sulfur and sulfur compounds, carbon, hydrogen, vacuum, working with high-alumina ceramics, is not prone to pitting corrosion, is prone to sagging at high temperatures can not withstand sudden dynamic loads.

    Standards

    Name Code Standards
    Classification, nomenclature and General rules В30 GOST 10994-74
    Wire, steel, alloy В73 GOST 12766.1-90, TU 14-1-1380-75, TU 14-131-820-90
    Tape В34 GOST 12766.2-90
    Bars and shapes В32 GOST 12766.3-90, GOST 12766.4-90, TU 14-11-245-88

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Al Ti Ca Ce Zr Ba
    GOST 10994-74 ≤0.05 ≤0.015 ≤0.02 ≤0.3 26-28 ≤0.6 ≤0.6 Rest 5-5.8 0.15-0.4 ≤0.1 ≤0.1 0.1 ≤0.5
    Fe is the basis.
    In accordance with GOST 10994-74, the content of calcium, cerium and barium is calculated. When smelting an alloy intended for the production of heating elements, fresh charge materials should be used. Waste of own marks may be used.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % d y, % HB, MPa
    Cold-rolled steel strip of 0.2-3.2 mm in the delivery state according to GOST 12766.2-90
    - ≤785 ≥10 - - 200-250
    Wire cross section of 0.1-7.5 mm. Heat to 760 °C (exposure 30 min), cooling in water
    - ≥534 ≥663 ≥16 - - -
    Wire cold-drawn heat-treated in the delivery condition according to GOST 12766.1-90 (the value is δ200)
    - ≤780 - ≥10 - -
    Wire cross section of 0.1-7.5 mm. Heat to 760 °C (exposure 30 min), cooling in water
    - ≥425 ≥660 ≥24 - ≥62 -
    Wire. Heating to 760 °C (exposure 30 min), cooling in water
    0.1-7.5 ≥534 ≥663 ≥16 - - -
    Wire cross section of 0.1-7.5 mm. Heat to 760 °C (exposure 30 min), cooling in water
    - ≥357 ≥605 ≥25 - ≥53 -
    - ≥354 ≥375 ≥33 - ≥71 -
    - - ≥87 ≥76 - ≥97 -
    - - ≥13 ≥127 - - -
    - - ≥9 ≥118 - - -

    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
    d Elongation after rupture
    y The relative narrowing
    HB Brinell hardness number

    Physical characteristics

    Temperature r, kg/m3 R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
    20 7190 1360 - 500
    100 - 1365 - -
    200 - 1370 - -
    300 - 1375 - -
    400 - 1380 - -
    500 - 1400 - -
    600 - 1400 - -
    700 - 1410 - -
    800 - 1410 - 690
    900 - 1420 - -
    1000 - - 15 -

    A description of the physical symbols

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

    Technological properties

    Name The value
    Weldability Welding methods - RDS and ADS. Welding heaters with operating temperatures above 1100 C produced by direct current with electrodes of the same material with a plaster finish 0.3 L-8. Welding heaters with operating temperatures up to 1100 C produced in conventional electrodes made of heat-resistant materials. ADS - non-consumable electrode with use of filler material alloy KH27JU5T. When welding of the heaters is necessary to cover them with asbestos sheets to prevent splashing and damage to the wire in this place.
    Склонность к отпускной хрупкости Inclined in the temperature range 400-500 °C.
    The temperature of forging Start - 1150 °C, the end - 1000 °C.
    Flock-sensitive sensitivity not sensitive.
    Microstructure Ferritic structure.
    Magnitnoi Ferromagnetic alloy.
    Survivability Survivability at a temperature of 1300 °C for at least 80 hours.
    The survivability of the alloy for heating elements At least 80 hours at a test temperature of 1300 °C. maximum recommended operating temperature of the heating element from 950 °C at a thickness of 0.2 mm to 1350 °C at a thickness ≥ 6.0 mm.