Steel 40L

  • 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 40Л
    Designation GOST Latin 40L
    Transliteration 40L
    By chemical elements 40

    Description

    Steel 40L is used: for the manufacture of machine beds, housings, couplings, brake discs, gears, casings, forks, sprockets and other parts operating at temperatures up to 400 °C; tsentrobezhnolityh pipes used as components in equipment for metallurgical, engineering, glass, ceramic, mining and processing petrochemical industry and is intended for the manufacture of blanks and parts used in the composition of the products of aviation and the nuclear industry.

    Standards

    Name Code Standards
    Steel castings В82 GOST 977-88, OST 24.920.01-80, OST 3-4365-79
    Classification, nomenclature and General rules В20 OST 84-218-85
    Steel pipes and fittings to them В62 TU 1333-003-76886532-2014
    Castings with special properties (iron and steel) В83 TU 4112-78269737-008-05

    Chemical composition

    Standard C S P Mn Si Fe
    TU 1333-003-76886532-2014 0.37-0.45 ≤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 HB, MPa
    Casting. Quenching with 860-880 °C + vacation at 600-630 °C
    100 ≥343 ≥540 ≥14 ≥20 ≥294 -
    Casting. Normalization at 860-880 °C + vacation at 600-630 °C
    100 ≥294 ≥520 ≥14 ≥25 ≥294 146-173

    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) a, 10-6 1/°C С, J/(kg · °C)
    0 7810 - - -
    20 7810 - - -
    100 - 60 124 470
    200 - 53 124 470
    400 - 47 126 483
    500 - 41 - -
    600 - - 145 525
    800 - - 146 571

    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 heat-treated state at 200 Kn NV TV.SPL.=1.1 Kn b.St.=1