Steel 9Х2МФ (9Х2МФА)

  • 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 9Х2МФ
    Designation GOST Latin 9X2MF
    Transliteration 9H2MF
    By chemical elements 9Cr2MoV
    Name The value
    Designation GOST Cyrillic 9Х2МФА
    Designation GOST Latin 9X2MFA
    Transliteration 9H2MFA
    By chemical elements 9Cr2MoV

    Description

    9Х2МФ steel is used: for the manufacture of working rolls of cold rolling of metals, in particularly severe conditions; the work rolls of wire cogging and section rolling mills; other important products with improved service characteristics.

    Standards

    Name Code Standards
    Machines and equipment for metallurgical and foundry industry Г44 OST 24.013.04-90, OST 24.013.20-90, OST 24.013.21-85
    Bars and shapes В32 TU 14-19-100-90
    Processing of metals by pressure. Forgings В03 TU 4121-002-33902054-2004

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu V Mo
    OST 24.013.04-90 0.85-0.95 ≤0.03 ≤0.03 0.2-0.7 1.7-2.1 0.25-0.5 ≤0.5 Rest ≤0.25 0.1-0.2 0.2-0.3
    TU 14-19-100-90 0.85-0.95 ≤0.01 ≤0.025 0.2-0.35 1.7-2.1 0.25-0.45 ≤0.3 Rest ≤0.25 0.1-0.3 0.2-0.3
    Fe is the basis.
    According to OST 24.013.04-90 the chemical composition is given for steel grade 9X2MF.
    According to TU 14-19-100-90 the chemical composition is given for steel grade 9Х2МФ-Ш. The total content of nickel and copper should not be more than 0.50%. Permissible deviations from the norms of chemical composition - according to GOST 5950.

    Mechanical properties

    sT|s0,2, MPa σU, MPa d5, % y, %
    A sample with a diameter of 6 mm, length 30 mm forged and annealed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    ≥100 ≥135 ≥47 ≥91
    ≥105 ≥135 ≥51 ≥95
    ≥41 ≥50 ≥53 ≥100
    ≥21 ≥30 ≥75 ≥100
    ≥11 ≥12 ≥71 ≥100
    ≥125 ≥160 ≥45 ≥83

    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

    Physical characteristics

    Temperature r, kg/m3 l, W/(m · °C) С, J/(kg · °C)
    20 7840 - -
    100 - 37 440
    200 - 34 460
    300 - 32 500
    400 - 32 570
    500 - 32 680
    600 - 30 800
    700 - 23 940
    800 - 20 1100
    900 - 14 500
    1000 - - 500
    1200 - - 500

    A description of the physical symbols

    Name Description
    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 Inclined.
    The temperature of forging Start - 1180 °C, the end - of 800 °C. the cross Sections up to 300 mm are cooled in the pit.
    Flock-sensitive sensitivity Sensitive.
    Machinability In the annealed condition with NV 170-207 and blower SB=610 MPa Kn TV.SPL.=0,85 Kn b.St.=0,80.
    Macrostructure and pollution In microtracker steel bars under the control of the etched templeto should not be the remnants of shrinkage and podnasadochnogo looseness, birdhouses, cracks, subcortical bubbles, delaminations, placenow, foreign non-metallic and slag inclusions, visible without using the magnifying devices. Allowed the Central porosity, point heterogeneity, liquation Pousada segregated square, common spotted liquation - small 1 mark for each parameter; layer-by-layer crystallization and the light loop - no more than 3 points.
    Microstructure Microstructure of steel bars shall conform to the following standards: microporosity is not allowed; carbide liquation - not more than 2 points; structural (carbide) banding - no more than 4 points.