Alloy 68NKHVKTJU (EP578)

  • Alloy 40KHNM (EI995)
  • Alloy 97NL (EI996)
  • Alloy 95NLM (EI996M)
  • Alloy 95NLVF (EI996V)
  • Alloy 68NKHVKTU (EP578)
  • Alloy 46NKhT (EP619)
  • Alloy 45NHT (EP218)
  • Alloy 44NCTU
  • Alloy 42NKhTUA (H41KhTA)
  • Alloy 42NKHTU (42NKHTUA)
  • Alloy 40KHMVTU
  • Alloy 36KhNTU (EI702)
  • Alloy 36NKhTYu8M (EP52)
  • Alloy 36NKhTU5M (EP51)
  • Alloy 36NKhTU (EI702)
  • Alloy 21NKMT (VES-130)
  • Alloy 17KhNGT (EI814)
  • Alloy 12KhNKMTU (SP22)

    • Designation

    Name The value
    Designation GOST Cyrillic 68НХВКТЮ
    Designation GOST Latin 68HXBKTJu
    Transliteration 68NHVKTYu
    By chemical elements 68NiCrВCoTeAl
    Name The value
    Designation GOST Cyrillic ЭП578
    Designation GOST Latin EP578
    Transliteration EhP578
    By chemical elements -

    Description

    Alloy 68NKHVKTJU used: for the manufacture of elastic sensing elements, operating at temperatures from -196 °C to +500 °C; details provocatively elements Aviapribor and automatic aviation systems.

    Note

    Alloy non-magnetic corrosion-resistant dispersion-hardened with a temporary resistance 1375- 1570 MN/m2 (140−160 kgf/mm2), with the normal elasticity modulus 196000- 216000 MN/m2 (20000- 22000 kgf/mm2).

    Standards

    Name Code Standards
    Classification, nomenclature and General rules В30 GOST 10994-74
    Tape В34 TU 14-1-4456-88
    Bars and shapes В32 TU 14-1-4470-88, TU 14-11-245-88
    Wire, steel, alloy В73 TU 14-1-4488-88

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu Al V B Ti Nb W Ce Co
    GOST 10994-74 ≤0.05 ≤0.01 ≤0.015 ≤0.4 18-20 ≤0.4 Rest ≤1 ≤0.07 1.3-1.8 ≤0.2 0.003 2.7-3.2 ≤0.2 9-10.5 0.05 5.5-6.7
    Ni is the basis.
    According to GOST 10994-74, the calculated content of boron and cerium is indicated.
    According to TU 14-1-4470-88 and TU 14-1-4456-88 the chemical composition is given for the alloy 68NHVKTYU-VI (EP578-VI). The residual content of niobium and vanadium is not more than 0.20% of each. Boron and cerium are introduced by calculation.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % d4 y, % KCU, kJ/m2 HB, MPa HRC HV, MPa
    Cold-rolled steel strip on the other 14-1-4456-88. Delivery condition - Dispersion hardening in a stepwise mode: 800 °C for 1 hour, 700 °C - 2 hours, air cooling
    - - ≥1470 - ≥1 - - - ≥46 ≥460
    - - ≥1370 - ≥1.5 - - - ≥43 ≥430
    The bars as supplied on the other 14-1-4470-88. Quenching in water from 1060-1100 °C + the Dispersion hardening at 790-810 °C (aging for 3.0-4.5 hours) + Dispersion hardening at 690-710 °C (extract 4-6 hours)
    60, 65, 70 ≥785 ≥1180 ≥15 - ≥20 ≥396 321-415 - -
    8-55 ≥835 ≥1230 ≥18 - ≥25 ≥539 321-415 - -
    60-100 ≥785 ≥1180 ≥15 - ≥20 ≥396 321-415 - -

    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
    d4 Elongation after rupture
    y The relative narrowing
    KCU Toughness
    HB Brinell hardness number
    HRC Rockwell hardness (indenter diamond spheroconical)
    HV The Vickers hardness