Babbit BKA

  • Babbitt BK2
  • Babbitt BK2C
  • Babbitt БК2Ш
  • Babbitt BKA

    • Designation

    Name The value
    Designation GOST Cyrillic БКА
    Designation GOST Latin BKA
    Transliteration BKA
    By chemical elements BeCo

    Description

    Babbit BKA is used: to fill the friction of axle bearings for railway cars and tenders Railways; in engine and metallurgical engineering (for potting of inserts Buks passenger carriages and freight wagons of broad gauge and bearings of locomotives and tenders, bearings of rolling mills, electric motors low rpm, centrifugal pumps and fans; to fill the tram books).

    Note

    The coefficient of friction of the babbit without lubrication of 0.44, with the grease of 0.004. Maximum load capacity: static — 200 kgf/cm2, dynamic — 500 kgf/cm2 sec. The maximum temperature of normal bearing operation — +150 °C. recommended fill thickness ≥3.0 mm.

    Standards

    Name Code Standards
    Non-ferrous metals, including rare, and their alloys В51 GOST 1209-90
    Castings, non-ferrous metals and alloys В84 OST 24.916.01-71

    Chemical composition

    Standard Al Zn Sb Pb Bi Ca Mg Na
    GOST 1209-90 0.05-0.2 0.4-0.6 ≤0.25 Rest ≤0.1 0.95-1.15 ≤0.2 0.7-0.9
    OST 24.916.01-71 0.05-0.2 - ≤0.25 Rest ≤0.1 0.85-1.15 ≤0.02 0.6-0.9
    Pb is the basis.
    According to GOST 1209-90 the total content of other impurities is ≤ 0.30%.
    The total content of impurities by OST 24.916.01-71 should be ≤ 0.30%. As agreed by the manufacturer with the consumer, babbit can be supplied with an aluminum content of less than 0.050%.

    Mechanical properties

    σU, MPa d HB, MPa
    In the delivery condition
    ≥91 ≥2.5 ≥32

    Description mechanical marks

    Name Description
    σU Limit short-term strength
    d Elongation after rupture
    HB Brinell hardness number

    Physical characteristics

    Temperature r, kg/m3
    20 10500

    A description of the physical symbols

    Name Description
    l Coefficient of thermal conductivity
    С Specific heat