Steel 30L

  • 08L steel
  • 15L steel
  • Steel 20L
  • Steel 25L
  • 30L steel
  • Steel 35L
  • 40L steel
  • 45L steel
  • 50L steel

    • Designation

    Name The value
    Designation GOST Cyrillic 30Л
    Designation GOST Latin 30L
    Transliteration 30L
    By chemical elements 30

    Description

    30L steel is used: for the manufacture of levers, balance wheels, gear housings, couplings, pulleys, brackets, parts of welded-cast structures, bowls and cones of the charging apparatus, beds, beams, support rings, tires, flywheels and other parts operating under the influence of average static and dynamic loads; casting parts, steam, gas, hydraulic turbines, and axial compressors.

    Standards

    Name Code Standards
    Steel castings В82 GOST 977-88, OST 24.920.01-80, OST 3-4365-79, TU 108-23.45-88, TU 108-978-80
    Classification, nomenclature and General rules В20 OST 84-218-85
    Welding and cutting metals. Soldering, riveting В05 RTM 108.020.122-78
    Castings with special properties (iron and steel) В83 TU 4112-78269737-008-05

    Chemical composition

    Standard C S P Mn Si Fe
    GOST 977-88 0.27-0.35 ≤0.04 ≤0.04 0.45-0.9 0.2-0.52 Rest
    Fe is the basis.
    The mass fraction of S and P content is indicated for 1 group of castings from the base steel. The content of sulfur and phosphorus in the castings of groups 2 and 3, in sour and basic open-hearth steel - see Table 4a in GOST 977-88.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
    Casting. Quenching with 860-880 °C + vacation at 610-630 °C
    100 ≥294 ≥491 ≥17 ≥30 ≥343
    Normalization at 900 °C + quenching from 800 °C + vacation at 580 °C (named place of clippings sample)
    - 320-330 545-550 20-25 28-30 -
    Casting. Normalization at 880-900 °C + vacation at 610-630 °C
    100 ≥255 ≥471 ≥17 ≥30 ≥343
    Normalization at 900 °C + quenching from 800 °C + vacation at 580 °C (named place of clippings sample)
    - 320-340 540-560 16-17 27-31 -
    Normalization at 900 °C + vacation at 580 °C (named place of clippings sample)
    - 320-330 545-550 20-25 28-30 -
    - 310-320 530-535 14-16 20-21 -
    Annealing at 900 °C + normalization at 900 °C + vacation at 600 °C (named place of clippings sample)
    - 255 480 28 44 -
    - 230 430 25 35 -

    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

    Physical characteristics

    Temperature r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
    0 7810 - - -
    20 7810 - - -
    100 - 76 126 470
    200 - 65 126 470
    400 - 44 15 483
    500 - 38 15 -
    300 - - 139 -
    700 - - 156 -
    600 - - - 525
    800 - - - 571

    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 Limited weldability. Welding methods: SMAW, ADS under gas protection electroslag welding. Recommended heating and subsequent heat treatment.
    Склонность к отпускной хрупкости Tend not.
    Flock-sensitive sensitivity not sensitive.
    Machinability In the annealed condition with HB of 160 Kn TV.SPL.=1,25 Kn b.St.=1,0.
    Welding defects Welding defects of castings after cutting is carried out with preliminary and attendant heating to 150-200 °C. for semi-automatic welding in carbon dioxide environment used welding wire SV-08G2S diameter of 2 mm at a current of 380-420 A. Welding defects by manual welding is done with electrodes Э50А type (GOST 9467) brand SSSI-13/55. Before mechanized welding of large defects of the edge samples, it is recommended to coat the electrodes of these brands. The thickness of the facing layer of 8-10 mm. After welding should slow cooling with rate 50 °C/h.