Alloy ML12

  • Alloy ML23
  • Alloy ML9
  • Alloy ML8
  • Alloy ML7-1
  • Alloy ML6
  • Alloy ML5pch
  • Alloy ML5on
  • Alloy ML5-2
  • Alloy ML5-1
  • Alloy ML5
  • Alloy ML4pch
  • Alloy ML4
  • Alloy ML3
  • Alloy ML22
  • Alloy ML21
  • Alloy ML20-1
  • Alloy ML2
  • Alloy ML19 (VML7)
  • Alloy ML18 (VML6)
  • Alloy ML17 (VML5)
  • Alloy ML15
  • Alloy ML12
  • Alloy ML11
  • Alloy ML10

    • Designation

    Name The value
    Designation GOST Cyrillic МЛ12
    Designation GOST Latin ML12
    Transliteration ML12
    By chemical elements CuЛ12

    Description

    Alloy ML12 applies: for production of castings loaded parts with maximum operating temperature of +200 °C — long, +250 °C short — term (beads, drums, wheels and other structures).

    Note

    Alloy system Mg-Zn-Zr.
    Doping with zirconium refines the grain, reduces the temperature interval of crystallization and, therefore, improves mechanical and casting properties.
    Compared with the alloys of the system Mg-Al-Zn alloy has several advantages. It possess higher strength characteristics. Refinement of the structure with the introduction of Zirconia reduces the sensitivity of the alloy to the thickness of the cross section of the casting. Due to the smaller grain size in castings microregion less than in the casting of alloys МЛ4 or ML5.
    ML12 alloy has satisfactory casting properties that allows its use for the casting of large castings of complex configuration in sand casting and gravity die casting. High yield strength alloy more ductile than the alloys of ML5 and МЛ6. It can be used in conditions of high static and alternating loads.
    Disadvantages of alloy — poor weldability and a tendency to form hot cracks during casting of thin-walled castings.

    Standards

    Name Code Standards
    Non-ferrous metals, including rare, and their alloys В51 GOST 2856-79
    Thermal and thermochemical treatment of metals В04 OST 1 90121-90
    Castings, non-ferrous metals and alloys В84 OST 1 90200-75, OST 1 90248-77
    Test methods. Packing. Marking В59 OST 1 90360-85

    Chemical composition

    Standard Si Ni Fe Cu Al Zn Zr Mg Be
    GOST 2856-79 ≤0.03 ≤0.005 ≤0.01 ≤0.03 ≤0.02 4-5 0.6-1.1 Rest ≤0.001
    Mg is the basis.
    According to GOST 2856-79, the content of other impurities is ≤ 0.12%, the sum of the impurities being determined is 0.20%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, %
    Casting in sand, shell, investment casting and plaster mold and chill casting GOST 2856-79. Without heat treatment
    ≥90 ≥200 ≥6
    Casting in sand, shell, investment casting and plaster mold and chill casting GOST 2856-79. Mode T1: Aging
    ≥130 ≥230 ≥5
    Casting forming OST 1 90200-75. In the delivery condition specified in the casting method, delivery condition and strength class KP
    ≥147 ≥245 ≥6
    ≥137 ≥226 ≥5
    ≥128 ≥206 ≥4
    ≥128 ≥186 ≥3

    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

    Physical characteristics

    Temperature Е, HPa r, kg/m3 l, W/(m · °C) С, J/(kg · °C)
    20 43 1810 1339 9629

    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
    Features of heat treatment According to OST 1 90121-90 casting in the ground, shell molding, gravity die casting, investment casting and plaster mold to enhance mechanical properties of castings (σв, σ0,2) applied heat treatment regime T1 - Aging at 300±5 °With (extract 4-6 hours), air cooling.