Steel 55KH

  • Steel 45KhNM (45KhNMA)
  • 4X2NMF steel
  • Steel 55X
  • Steel 60Kh2SMF
  • Steel 60CrNiG
  • 60KhN steel
  • 75XM steel
  • Steel 75KhSMF
  • 7X2SMF steel
  • Steel 90KhMF
  • Steel 9Х2МФ (9Х2МФА)

    • Designation

    Name The value
    Designation GOST Cyrillic 55Х
    Designation GOST Latin 55X
    Transliteration 55H
    By chemical elements 55Cr

    Description

    55KH steel is used: for the manufacture of a compound of the axes of the backup rolls for cold rolling of metals; work rolls Blumenhof, rollable, billet, rail and structural steel, heavy section, medium section and light section mills and work rolls of sheet mills for hot rolling of metals; gear shafts, gears and other stressed parts exposed to abrasion, but working without significant impact.

    Standards

    Name Code Standards
    Processing of metals by pressure. Forgings В03 GOST 8479-70, TU 108-11-905-87

    Chemical composition

    Standard C S P Mn Cr Si Ni
    0.5-0.6 ≤0.04 ≤0.04 0.35-0.65 1-1.3 0.17-0.37 ≤0.5

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
    Quenching in oil from 820-840 °C + Vacation at 560-630 °C, cooling in furnace or in air
    ≤100 ≥640 ≥840 ≥12 ≥40 - 255-322
    Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
    - - ≥190 ≥52 ≥65 - -
    Quenching in oil from 820-840 °C + Vacation at 560-630 °C, cooling in furnace or in air
    101-300 ≥540 ≥780 ≥10 ≥35 - 240-302
    Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
    - - ≥115 ≥56 ≥80 - -
    Quenching in oil from 820-840 °C + Vacation at 560-630 °C, cooling in furnace or in air
    301-500 ≥490 ≥730 ≥8 ≥30 - 240-300
    Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
    - - ≥78 ≥83 ≥99 - -
    Normalization at 840-860 °C, air cooling + Vacation at 580-630 °C, air cooling or pecii
    301-500 ≥340 ≥640 ≥8 ≥30 - 210-240
    Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
    - - ≥54 ≥89 ≥100 - -
    The forging temperature of 1210 °C, exposure time 10 h of Isothermal annealing. Normalization. High vacation.
    480 ≥380 ≥780 ≥13 ≥22 ≥210 -
    Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
    - - ≥40 ≥99 ≥100 - -
    The forging temperature of 1210 °C, exposure time 10 h of Isothermal annealing. Normalization. High vacation.
    670 ≥360 ≥760 ≥10 ≥17 ≥200 -
    Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
    - - ≥27 - ≥100 - -
    The forging temperature of 1210 °C, exposure time 10 h of Isothermal annealing. Normalization. High vacation.
    960 ≥340 ≥750 ≥9 ≥15 ≥180 -

    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
    KCU Toughness
    HB Brinell hardness number

    Technological properties

    Name The value
    Weldability Steel difficult weldability. Welding methods: SMAW, essential heating and subsequent heat treatment. The CCC, the necessary subsequent heat treatment.
    Склонность к отпускной хрупкости Inclined.
    The temperature of forging Beginning - 1220 °C, the end - of 800 °C. the cross Sections up to 200 mm are cooled in air, 200-350 mm in the pit.
    Flock-sensitive sensitivity Sensitive.