Steel 50L

  • 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 50Л
    Designation GOST Latin 50L
    Transliteration 50L
    By chemical elements 50

    Description

    50L steel is used: for the manufacture of gears, sliders, wheels, gears, lifting machines, rolls of large-, medium -, and small-section mills for rolling soft metal and other working parts for wear.

    Note

    Steel 50L is used in the normalized or improved state and after surface hardening with heating HDTV.

    Standards

    Name Code Standards
    Steel castings В82 GOST 977-88, OST 24.920.01-80, OST 3-4365-79, OST 5Р.9285-95
    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 0.47-0.55 ≤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 d y, % KCU, kJ/m2 HB, MPa
    Hardening in air, 860-880 °C + vacation at 600-630 °C
    100 ≥392 ≥736 ≥14 ≥20 ≥294 -
    Normalization at 860-880 °C, air cooling to 300-350 °C, exposure 2 h + vacation at 600-620 °C (extract 3 hours), cooled for 1 h in a furnace to 500 °C, air cooling (named place of clippings sample)
    100 280-340 630-710 14-17 13-19 - 206-229
    Normalization at 860-880 °C + vacation at 600-630 °C
    100 ≥334 ≥569 ≥11 ≥20 ≥245 159-240
    Normalization at 860-880 °C, air cooling to 300-350 °C, exposure 2 h + vacation at 600-620 °C (extract 3 hours), cooled for 1 h in a furnace to 500 °C, air cooling (named place of clippings sample)
    10 295-355 650-680 15-21 13-27 - -
    Annealing at 850-870 °C, cooling with furnace + normalization at 870-880 °C + vacation at 600-650 °C, air cooling
    30 ≥335 ≥570 ≥11 ≥20 ≥240 ≥174
    Normalization at 860-880 °C, air cooling to 300-350 °C, exposure 2 h + vacation at 600-620 °C (extract 3 hours), cooled for 1 h in a furnace to 500 °C, air cooling (named place of clippings sample)
    100 270-360 620-710 13-15 14-17 - 229
    30 290-325 650-690 15-19 19-25 - 170-187
    Castings for shipbuilding. Normalization at 850-880 °C + vacation at 630-670 °C, air cooling
    - ≥340 ≥580 ≥11 ≥18 ≥250 170-199
    Normalization at 860-880 °C, air cooling to 300-350 °C, exposure 2 h + vacation at 600-620 °C (extract 3 hours), cooled for 1 h in a furnace to 500 °C, air cooling (named place of clippings sample)
    50 265-275 610-630 16-21 19-28 - 162-170
    After normalization and tempering quenching in oil 860-870 °C + vacation at 620-630 °C (extract 3 hours), air cooling (named place of clippings sample)
    100 420-470 750-760 19-23 34-44 - 216-229
    200 375-430 670-750 17-23 32-61 - 206
    10 480-530 760-780 16-21 36-41 - 216-229
    100 395-440 710-750 18-21 44-54 - 229
    200 375-390 680-710 12-18 44-54 - 229
    30 420-475 720-770 18-27 40-59 - 216-229
    50 400-440 710-750 16-24 54-56 - 206-229

    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

    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)
    0 219 85 7820 48 191 - -
    20 219 - 7820 48 191 - -
    100 214 83 - 48 240 12 479
    200 208 81 - 46 321 124 500
    300 196 76 - 44 407 128 517
    400 178 69 - 41 509 133 542
    500 170 65 - 38 631 137 559
    600 155 59 - 34 779 141 584
    700 136 52 - 30 941 145 617
    800 122 46 - 25 1139 124 727
    900 - - - 26 1170 124 727
    1100 - - - - - 133 710

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    r Density
    l Coefficient of thermal conductivity
    С Specific heat

    Technological properties

    Name The value
    Weldability limited weldability. Requires pre-heating and subsequent heat treatment.