Steel 75Х8Н34Г2В3 (ЭИ278)

  • Steel 07Х17Н16 (EP626; 0Х17Н16)
  • Steel 20Х12Н12Г6 (ЭИ429)
  • Steel 50X4G18
  • Steel 5Х3Н12Г5 (Н12ХГ)
  • Steel 60Х3Г8Н8В
  • Steel 60Х3Г8Н8Ф
  • Steel 75Х8Н34Г2В3 (ЭИ278)

    • Designation

    Name The value
    Designation GOST Cyrillic 75Х8Н34Г2В3
    Designation GOST Latin 75X8H34G2B3
    Transliteration 75H8N34G2V3
    By chemical elements 75Cr8Н34Mn2W3
    Name The value
    Designation GOST Cyrillic ЭИ278
    Designation GOST Latin EI278
    Transliteration EhI278
    By chemical elements -

    Description

    75Х8Н34Г2В3 steel is used: for the manufacture of the torque springs (thin strips, bent into the shape of a spiral of Archimedes), for power circuit elements in the instruments; tuning forks.

    Note

    Steel for torque spring must have:
    — constant elastic properties in time and at a predetermined temperature gradient;
    — minimum value of residual strain;
    strict proportionality between the generated reactive torque and angle of twist;
    — antimagnetisch, anticorrosional and electrical conductivity (for special equipment).

    Standards

    Name Code Standards
    Bars and shapes В32 TU 14-131-785-89

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe W
    TU 14-131-785-89 0.7-0.8 ≤0.03 ≤0.04 2-3 7-9 ≤0.6 33-35 Rest 3-4
    Fe is the basis.
    According to TU 14-131-785-89, deviations from the mass fraction of elements are allowed within the limits of: carbon ± 0.010%, silicon +0.050%, manganese ± 0.050%, tungsten ± 0.15%, chromium +0.20 / -0.10%, for nickel + 0.10 / -0.15%.