Steel 45L

  • 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 45Л
    Designation GOST Latin 45L
    Transliteration 45L
    By chemical elements 45

    Description

    45L steel is used: for the manufacture of castings working parts for wear; machine beds, gears and gear rings, brake discs, clutches, casings, rollers, sprockets and other parts, which are requirements of high strength and high wear resistance under static and dynamic loads; casting parts mining and metallurgical machinery; casting investment casting for aircraft industry group I — loaded items with the specific requirements for density and mechanical properties: high load brackets, sealed the housing, the frames of gyroscopes, stabilizers, etc. and group II — non-loaded and lightly loaded parts, rings, flanges, fittings, leaking instrument cabinets, etc.

    Standards

    Name Code Standards
    Castings with special properties (iron and steel) В83 KSt 81-033:2009, TU 4112-78269737-008-05
    Steel castings В82 GOST 977-88, OST 24.920.01-80, OST 3-4365-79, OST 1 80059-83, OST 5Р.9285-95, TU 108.11.352-87, TU 108-23.45-88
    Hard alloys, ceramic-metal products and metal powder В56 OST 107.750001.001-91
    Classification, nomenclature and General rules В20 OST 84-218-85
    Welding and cutting metals. Soldering, riveting В05 RTM 108.020.122-78

    Chemical composition

    Standard C S P Mn Si Fe
    KSt 81-033:2009 0.42-0.5 ≤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 t отпуска, °C sT|s0,2, MPa σU, MPa d y, % KCU, kJ/m2 HB, MPa HRC
    Casting section 100 mm Quenching in oil from 830 °C
    - 200 - ≥1810 - - - ≥550 -
    Hardening HDTV + low vacation, chilling in the water
    - - - - - - - - 42-56
    Casting section 100 mm Quenching in oil from 830 °C
    - 300 - ≥1670 ≥2 ≥3 - ≥500 -
    Normalization at 860-880 °C + vacation at 630-650 °C
    - - ≥290 ≥520 ≥10 ≥18 ≥240 148-217 -
    Casting section 100 mm Quenching in oil from 830 °C
    - 400 - ≥1390 ≥4 ≥9 - ≥450 -
    Castings for shipbuilding. Normalization at 860-890 °C + vacation at 630-670 °C, air cooling
    - - ≥320 ≥550 ≥12 ≥20 ≥300 153-183 -
    Casting. Hardening in air, 860-880 °C + vacation at 600-630 °C, air cooling
    100 - ≥392 ≥589 ≥10 ≥20 ≥245 - -
    Casting. Normalization at 860-880 °C + vacation at 600-630 °C, air cooling
    100 - ≥314 ≥540 ≥12 ≥20 ≥294 143-241 -

    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
    d Elongation after rupture
    y The relative narrowing
    KCU Toughness
    HB Brinell hardness number
    HRC Rockwell hardness (indenter diamond spheroconical)

    Physical characteristics

    Temperature r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
    0 7800 - - -
    20 7800 - - -
    100 - 68 116 470
    200 - 55 - 470
    400 - 36 - 483
    500 - 32 - -
    300 - - 116 -
    600 - - - 525
    800 - - - 571

    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
    С Specific heat

    Technological properties

    Name The value
    Weldability Difficult weldability. Method of welding: SMAW. Requires heating before welding and subsequent heat treatment.
    Склонность к отпускной хрупкости Tend not.
    Flock-sensitive sensitivity not sensitive.
    Machinability In the annealed condition with 200 Kn NV TV.SPL.=1,1 Kn b.St.=0,7.
    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.