Steel 15L

  • 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 15Л
    Designation GOST Latin 15L
    Transliteration 15L
    By chemical elements 15

    Description

    15L steel is used: for the manufacture of pile drivers women, rollers, housings, leashes, grips, saw frames, details of welded-cast structures with a large amount of welding, plates, pillows, and other non-critical parts, working medium under the action of static and dynamic loads; the castings 1, 2 and 3 parts of valves and actuators to it (details of the magnetic, covers, caps, electromagnetic actuators and valves), working in different environments at temperatures from -40 to +400 °C and a nominal pressure up to 6.3 MPa (63 kgf/cm2); casting equipment parts (valves) for nuclear power stations, heat supply stations, heat and power plants, experimental and research nuclear reactors and installations.

    Standards

    Name Code Standards
    Steel castings В82 GOST 977-88, OST 26-07-402-83, OST 24.920.01-80, OST 3-4365-79, TU 26-02-19-75, TU 108.11.352-87, ST ЦКБА 014-2004, TU 5.961-11151-92
    Welding and cutting metals. Soldering, riveting В05 RTM 108.020.122-78

    Chemical composition

    Standard C S P Mn Si Fe
    GOST 977-88 0.12-0.2 ≤0.04 ≤0.04 0.45-0.9 0.2-0.52 Rest
    TU 5.961-11151-92 0.12-0.2 ≤0.025 ≤0.025 0.45-0.9 0.2-0.52 Rest
    Fe is the basis.
    According to GOST 977-88 the mass fraction of S and P content is indicated for 1 group of castings from the main 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.
    According to TU 5.961-11151-92 for castings of grades 1 and 2 the mass fraction of cobalt in steel should not exceed 0.20%, and for castings in the direct irradiation zone - 0.15%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d y, % KCU, kJ/m2 HB, MPa
    Casting. Normalization at 910-930 °C or Normalizing at 910-930 °C + Vacation at 670-690 °C
    100 ≥196 ≥392 ≥24 ≥35 ≥491 -
    Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Normalization at 910-930 °C + Vacation at 670-690 °C
    - ≥196 ≥392 ≥24 ≥35 ≥490 109-136
    - ≥160 ≥370 - ≥34 - -
    - ≥140 ≥350 - ≥32 - -
    - ≥120 ≥340 - ≥30 - -

    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 r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
    0 7820 - - -
    20 7820 - - -
    100 - 78 119 470
    200 - 67 119 470
    400 - 48 136 479
    500 - 41 136 -
    300 - - 125 -
    700 - - 142 -
    600 - - - 517
    800 - - - 571

    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 Welded without any restrictions. Welding methods: SMAW, ADS under gas protection electroslag welding. After repair of defects by welding is applied leave in 619-660 °C.
    Склонность к отпускной хрупкости Tend not.
    Flock-sensitive sensitivity not sensitive.
    Welding defects Welding defects of castings after cutting is usually carried out without prior and concomitant heating. By semiautomatic 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 Э42А type (GOST 9467) brand SSSI-13/45. When welding the hard contour of the casting or of the sample volume more than 2000 cm3 is recommended before applying the first roller to pre-heating at 120-150 °C. When welding is sample size more than 5000 cm3 it is necessary to produce preliminary and accompanying heating to 150-180 °C.