Steel 50KHFA (50ХФ)

  • 70G steel
  • Steel 60S2HFA
  • Steel 60KhFA (60KhF)
  • Steel 65
  • Steel 65G (65G1)
  • Steel 65GA
  • Steel 65S2VA
  • Steel 68A
  • Steel 68GA
  • Steel 70
  • Steel 60S2HG
  • Steel 70G2
  • Steel 70S2HA (EI142)
  • Steel 70C3A
  • 70KhGFA steel
  • Steel 75
  • Steel 80
  • Steel 85
  • KT-2 steel
  • KT-3 steel
  • Steel 55S2A
  • Steel 3K-7
  • Steel 40P
  • Steel 50RA (50P)
  • 50KhG steel
  • 50KhGA steel
  • 50KhGFA steel
  • Steel 50KhFA (50KhF)
  • 51KhFA steel
  • Steel 55C2
  • Steel 60С2Х (60С2ХА; 60С2ХАA)
  • Steel 55S2GF
  • Steel 55KhGR
  • Steel 55KhFA (55KhF)
  • 60G steel
  • Steel 60C2
  • Steel 60S2A
  • Steel 60S2G
  • Steel 60C2H2A

    • Designation

    Name The value
    Designation GOST Cyrillic 50ХФА
    Designation GOST Latin 50XFA
    Transliteration 50HFA
    By chemical elements 50CrV
    Name The value
    Designation GOST Cyrillic 50ХФ
    Designation GOST Latin 50XF
    Transliteration 50HF
    By chemical elements 50CrV

    Description

    50KHFA steel is used: for the manufacture of heavy-loaded critical parts, which are requirements of high fatigue strength; springs operating at temperatures to +300 °C; measuring tapes; valve spring compressors, exposed after coiling heat treatment (hardening and tempering).

    Note

    Steel spring alloy of high quality.

    Standards

    Name Code Standards
    Sheets and strips В23 GOST 103-2006
    Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
    Tape В34 GOST 2283-79, TU 14-1-2992-80, TU 14-4-357-73, TU 14-4-469-73, TU 14-4-580-74, TU 14-4-400-73
    Steel wire medium and high carbon В72 GOST 26366-84
    Sheets and strips В33 GOST 4405-75, TU 14-1-3196-81, TU 14-1-3396-82
    Bars and shapes В32 GOST 7417-75, GOST 7419-90, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 14959-79, TU 14-1-2118-77, TU 14-1-2462-78, TU 14-1-575-73, TU 14-1-658-73, TU 14-1-950-74, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008
    Processing of metals by pressure. Forgings В03 GOST 8479-70, ST ЦКБА 010-2004
    Blanks. Of the workpiece. Slabs В31 TU 14-1-1213-75, TU 1-92-156-90
    Steel pipes and fittings to them В62 TU 14-3-356-75
    Wire, steel, alloy В73 TU 14-4-70-72

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
    TU 14-1-950-74 0.46-0.54 ≤0.025 ≤0.025 0.5-0.8 0.8-1.1 0.17-0.37 ≤0.3 Rest ≤0.25 0.1-0.2 ≤0.03 ≤0.15 ≤0.2
    GOST 14959-79 0.46-0.54 ≤0.025 ≤0.025 0.5-0.8 0.8-1.1 0.17-0.37 ≤0.25 Rest ≤0.2 0.1-0.2 - - -
    Fe is the basis.

    Mechanical properties

    Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % d4 y, % KCU, kJ/m2 HB, MPa HRC
    Forgings. Hardening + Vacation
    100-300 - ≥685 ≥835 ≥12 - ≥38 ≥480 262-311 -
    Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
    0.1-4 - - 780-1180 - - - - - -
    Rolled steel. Quenching in oil at 880 °C to + leave at 500 °C
    20 - ≥1200 ≥1320 ≥12 - ≥42 - ≥385 -
    Rod 20-40 mm. (indicate the modes of heat treatment)
    - - ≥350 ≥650 ≥20 - - - - -
    Rolled steel. Quenching in oil from 850 °C + Vacation
    - - ≥1580 ≥1940 ≥1 - - - - 52-54
    Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C
    - - ≥840 ≥940 ≥22 - ≥62 - - -
    Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
    0.1-4 - - ≤880 - ≥8 - - - -
    Rolled steel. Quenching in oil at 880 °C to + leave at 500 °C
    40 - ≥1030 ≥1180 ≥15 - ≥47 - ≥350 -
    Rolled steel. Quenching in oil from 850 °C + Vacation
    - 200 ≥1760 ≥2010 ≥2 - - - - 50-51
    Rod 20-40 mm. (indicate the modes of heat treatment)
    - - ≥420 ≥710 ≥16 - - - - -
    Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C
    - - ≥820 ≥910 ≥16 - ≥62 - - -
    Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
    0.1-4 - - ≤740 - ≥10 - - - -
    Rolled steel. Quenching in oil at 880 °C to + leave at 500 °C
    60 - ≥860 ≥1060 ≥18 - ≥50 - ≥300 -
    Rolled steel. Quenching in oil from 850 °C + Vacation
    - 300 ≥1640 ≥1690 ≥2 - - - - 48-49
    Rod 20-40 mm. (indicate the modes of heat treatment)
    - - ≥350 ≥570 ≥22 - - - - -
    Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C
    - - ≥750 ≥830 ≥20 - ≥59 - - -
    Rolled steel. Quenching in oil from 850 °C + Vacation
    - 450 - ≥1580 ≥4 - ≥36 - - 45-47
    Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C
    - - ≥710 ≥830 ≥16 - ≥62 - - -
    Spring. Wrapped at 850-870 °C, quenching in oil from 850 °C + Vacation at 420-450 °C, air cooling
    ≤15 - ≥1270 ≥1470 ≥12 - - - - 44-49
    Rolled steel. Quenching in oil from 850 °C + Vacation
    - 500 - ≥1370 ≥8 - ≥54 - - 43-44
    Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C
    - - ≥420 ≥500 ≥26 - ≥74 - - -
    Bars and strip hot rolled and forged. Quenching in oil with 845-875 °C + Vacation at 450-500 °C, cooling in oil
    - ≥1080 ≥1270 ≥10 - ≥45 - ≥363 -
    Rolled steel. Quenching in oil from 850 °C + vacation at 640 °C
    - - - ≥380 ≥30 - ≥87 - - -
    Bars and rods of steel treated in the ladle a synthetic slag in the delivery condition on the other 14-1-658-73. Samples of the cross
    - - - ≥5 - ≥27 - - -
    Rolled steel. Quenching in oil from 860 °C to + vacation at 480 °C. At 20 °C HRC=42-44
    - - ≥1370 ≥1470 ≥10 - ≥42 - - -
    Rolled steel. Isothermal annealing (in a molten salt with a temperature of 320-330 °C) 870 °C to + leave at 330 °C, air cooling
    ≤20 - ≥1430 ≥1570 ≥6 - - ≥589 - 44-50
    Rolled steel. Quenching in oil from 860 °C to + vacation at 480 °C. At 20 °C HRC=42-44
    - - ≥1250 ≥1410 ≥9 - ≥40 - - -
    Rolled steel. Steel categories: 3, 3A, 3B, 3C, 3D, 4, 4A, 4B. Quenching in oil from 850 °C + Vacation at 470 °C
    - ≥1080 ≥1270 ≥8 - ≥35 - ≤269 -
    Rolled steel. Quenching in oil from 860 °C to + vacation at 480 °C. At 20 °C HRC=42-44
    - - ≥1200 ≥1380 ≥9 - ≥32 - - -
    - - ≥1180 ≥1370 ≥13 - ≥40 - - -
    - - ≥1060 ≥1200 ≥15 - ≥60 - - -

    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)

    Physical characteristics

    Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
    0 218 85 7800 40 320 - -
    20 218 - 7800 40 320 - -
    100 215 83 7780 39 - 117 490
    200 210 81 7750 38 - 122 505
    300 200 79 7720 37 - 129 510
    400 188 73 7680 36 - 135 530
    500 178 70 7650 33 - 14 560
    600 160 62 7610 31 - 144 520
    700 142 54 - 29 - 146 620
    800 132 50 - 28 - 146 620
    1000 - - - - - 131 700

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    G Modulus of elasticity shear torsion
    r Density
    l Coefficient of thermal conductivity
    R UD. the resistivity
    a The coefficient of linear expansion

    Technological properties

    Name The value
    Weldability Does not apply to welded structures.
    Склонность к отпускной хрупкости Malosolone.
    The temperature of forging Start - 1180 °C, the end - of 800 °C. the cooling of the workpiece cross-section up to 50 mm in the air, 51-180 mm in the wells.
    Flock-sensitive sensitivity not sensitive.
    Machinability In hot-rolled condition with HB 269 and blower SB=900 MPa Kn TV.SPL.=0,70 Kn b.St.=0,35.