Steel 75ХМ

  • 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 75ХМ
    Designation GOST Latin 75XM
    Transliteration 75HM
    By chemical elements 75CrMo

    Description

    75ХМ steel is used: for the production of forgings of various parts of General engineering; work and backup rolls in sheet mills for hot rolling of metals; backup rolls for hot rolling of ferrous metals; backup rolls two — and four-roll stands sheet mills for cold rolling of metals.

    Standards

    Name Code Standards
    Processing of metals by pressure. Forgings В03 TU 108-11-905-87, TU 4121-002-33902054-2004, TU 108.11.917-87

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Mo
    TU 108.11.917-87 0.7-0.8 ≤0.03 ≤0.03 0.2-0.7 1.4-1.7 0.2-0.6 ≤0.5 Rest 0.2-0.3
    Fe is the basis.
    According to TU 108.11.917-87, after processing the steel, a limitation on the content of sulfur and phosphorus is introduced on the OSRV. The total content of sulfur and phosphorus after OSRV ≤ 0.050%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
    Forgings. Normalizing at 950 °C + Normalization at 820 °C + Vacation at 500 °C (exposure 4 h), air cooling (named place of cutting of the sample and the cutting direction)
    500 ≥375 ≥740 ≥21 ≥31 ≥150 ≥197
    700 ≥440 ≥790 ≥6 ≥6 ≥240 ≥229
    500 ≥430 ≥750 ≥19 ≥41 ≥240 ≥199
    700 ≥660 ≥1040 ≥10 ≥13 ≥200 ≥285
    500 ≥450 ≥770 ≥19 ≥36 ≥310 ≥207
    700 ≥425 ≥840 ≥16 ≥21 ≥240 ≥229
    500 ≥420 ≥750 ≥22 ≥46 ≥570 ≥207
    700 ≥650 ≥1060 ≥13 ≥20 ≥220 ≥285
    500 ≥365 ≥740 ≥9 ≥9 ≥220 ≥211
    700 - - - - ≥190 ≥229
    500 ≥410 ≥750 ≥21 ≥34 ≥170 ≥199
    700 - ≥590 - - ≥40 ≥313

    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

    Physical characteristics

    Temperature r, kg/m3 l, W/(m · °C) С, J/(kg · °C)
    0 7900 - -
    20 7900 - -
    100 - 45 490
    200 - 41 500
    300 - 40 530
    400 - 39 570
    500 - 38 640
    600 - 37 750
    700 - 35 900
    800 - 24 700
    900 - 31 760
    1000 - - 760
    1200 - - 810

    A description of the physical symbols

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

    Technological properties

    Name The value
    Weldability does not apply to welded structures.
    Склонность к отпускной хрупкости tend not
    The temperature of forging Start - 1200 °C, the end - of 800 °C. the cross Sections up to 100 mm are cooled in air, 101-350 mm - in the pit.
    Flock-sensitive sensitivity insensitive
    Machinability In the normalized condition Kn TV.SPL.=0.90 Kn b.St.=0.60