Alloy KHN77TJU (ЭИ437А)

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  • Alloy KhN77TU (EI437A)
  • Alloy CrN78T (EI435)
  • Alloy EC79

    • Designation

    Name The value
    Designation GOST Cyrillic ХН77ТЮ
    Designation GOST Latin XH77TJu
    Transliteration HN77TYu
    By chemical elements CrNi77TeAl
    Name The value
    Designation GOST Cyrillic ЭИ437А
    Designation GOST Latin EI437A
    Transliteration EhI437A
    By chemical elements -

    Description

    Alloy KHN77TJU used: for the production of hot-rolled steel plate; welding wire used for welding parts and welding of steel structures in energy engineering; welding electrodes.

    Note

    High-temperature Nickel-based alloy.
    The recommended maximum operating temperature for limited time +750 °C. the Temperature of beginning of intensive scaling in air +1050 °C.

    Standards

    Name Code Standards
    Bars and shapes В32 GOST 23705-79, TU 14-1-402-72, TU 14-1-75-71, TU 14-1-764-73
    Blanks. Of the workpiece. Slabs В31 OST 1 90335-82, OST 1 90374-87, TU 14-1-1214-75
    Sheets and strips В33 TU 14-1-146-71, TU 14-1-5103-92
    Bars В55 TU 14-1-3175-81
    Welding and cutting metals. Soldering, riveting В05 TU 14-1-997-74, TU 14-1-997-2012

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu Al B Ti Pb Ce
    TU 14-1-997-74 ≤0.06 ≤0.007 ≤0.015 ≤0.4 19-22 ≤0.6 Rest ≤1 ≤0.07 0.55-0.95 - 2.3-2.7 ≤0.001 ≤0.02
    TU 14-1-146-71 ≤0.06 ≤0.007 ≤0.015 ≤0.4 19-22 ≤0.6 Rest ≤1 ≤0.07 0.55-0.95 ≤0.003 2.3-2.7 ≤0.001 ≤0.02
    TU 14-1-5103-92 ≤0.06 ≤0.007 ≤0.015 ≤0.4 19-22 ≤0.6 Rest ≤1 - 0.55-0.95 ≤0.003 2.3-2.7 ≤0.001 ≤0.02
    Ni is the basis.
    According to TU 14-1-5103-92, TU 14-1-146-71, TU 14-1-402-72, TU 14-1-997-74 the chemical composition is given for ХН77ТЮ (ЭИ437А). Boron, cerium and zirconium are introduced into the metal by calculation and chemical analysis are not determined.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, % HB, MPa
    Ring welded at OST 1 90374-87. Heating to 1070-1090 °With, exposure time 8 hours, quenching in air + Ageing at 690-710 °C for 16 hours, air cooling
    ≥470 ≥882 ≥20 ≥20 248-340
    Hot-rolled sheet. Heating to 1070-1090 °C (exposure 8 h), air cooling + Ageing at 690-710 °C (aging 16 h), air cooling
    4-11 ≥590 ≥980 ≥20 - -
    Ring welded at OST 1 90374-87. Heating to 1070-1090 °With, exposure time 8 hours, quenching in air + Ageing at 690-710 °C for 16 hours, air cooling
    ≥421 ≥784 ≥10 ≥10 -
    Hot-rolled sheet. Heating to 1070-1090 °C (exposure 8 h), air cooling + Ageing at 690-710 °C (aging 16 h), air cooling
    4-11 - ≥610 ≥5 - -
    Hot-rolled sheet. Quenching in water, in air or under water shower with 1060-1100 °C
    4-11 - ≤880 ≥30 - -
    Bars hot rolled and forged and according to GOST 23705-79. Heating to 1070-1090 °With, exposure time 8 hours, air cooling + Ageing at 690-710 °C for 16 hours, air cooling
    - ≥608 ≥5 ≥12 -
    - - - - 255-321

    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
    HB Brinell hardness number