Cast iron SCH20

  • Cr21 cast iron
  • ChTB1.8 cast iron
  • ChNM1.2 cast iron
  • ChM1.8 cast iron
  • SCI cast iron
  • Cr35 cast iron
  • Cr30 cast iron
  • Cr25 cast iron
  • Cr24 cast iron
  • Cr20CrNi2 cast iron
  • Cr20KhN cast iron
  • Cr20 cast iron
  • Cr18 cast iron
  • Cr15 cast iron
  • Cr10 cast iron
  • Cast iron SCh03Ts01B
  • NKHT pig iron (NKHT)

    • Designation

    Name The value
    Designation GOST Cyrillic СЧ20
    Designation GOST Latin CCh20
    Transliteration SCh20
    By chemical elements -

    Description

    Cast iron SCH20 used: for the manufacture of castings with the lowest allowable wall thickness 10 mm: crankcases, covers, cylinder blocks, brake drums, heads and cylinder liners and other parts to automobile and tractor construction; machine beds, machine tools, surface plates, cylinders, valves, machine bases, rails, tables, in machine tools; exhaust pipes, flywheels, crankcases fundamental frames, covers, working cylinders, blocks, and other critical parts of the diesel engine; covers, gears, gears, gears, pulleys, flywheels (at a rate of not more than 3.5 m/s), frames, gearboxes, couplings, steam cylinders and other parts sredneshirotnykh chemical engineering; parts working in compression (Bashmakov, columns); various pipes and radiators; castings for stationary steam turbines, turbine equipment, nuclear power plants, elements of steam boilers and pipelines, hydraulic turbines, hydraulic locks, and other equipment engineering: casting 3 groups subjected to static loads and castings, working in conditions of water vapor and oil at temperatures up to 70 °C (Cabinet, bearing housings, caps-support volobouev, frames, bearings, frames, foundations, liners, bushings, racks, nozzles, covers); casts of group 2, operating at temperatures up to 250 °C, exposed to high static and dynamic loads and friction (pistons, housings, bearing housings, housings worm wheels, bushings, bearing caps, nozzles, compressors, diaphragms, frames, Foundation, frames, exhaust parts, compressor pipes, gear wheels, gear); casting parts of valves and actuators to it; casting parts mining and metallurgical equipment; cast connecting parts for pipelines.

    Standards

    Name Code Standards
    Castings with special properties (iron and steel) В83 KSt 81-033:2009
    Cast iron В11 GOST 1412-85, STP М319-95
    Pipes of ferrous metals and alloys, cast fittings to them В61 GOST 5525-88, GOST 9583-75
    Cast iron castings (grey and malleable cast iron) В81 OST 108.962.01-85, OST 24.207.01-90, OST 23.4.258-86, OST 23.4.117-84, TU 14-3-964-80, TU 1-812-0072-94

    Chemical composition

    Standard C S P Mn Cr Si Fe
    GOST 1412-85 3.3-3.5 ≤0.15 ≤0.2 0.7-1 - 1.4-2.4 Rest
    KSt 81-033:2009 3.3-3.5 ≤0.15 ≤0.2 0.7-1 - 1.4-2.4 Rest
    STP М319-95 3.2-3.7 ≤0.15 ≤0.2 0.4-0.9 ≤0.15 1.5-2.3 Rest
    Fe is the basis.
    According to GOST 1412-85, low alloying of cast iron by various elements (chromium, nickel, copper, phosphorus, etc.) is allowed.
    According to the STP M319-95 in cast iron, a chromium content of not more than 0.30% is allowed on medium and large non-castable castings with a wall thickness of 20 mm or more. Chill castings should be made of cast iron with an increased content of silicon, which should be 1.70-2.30%.

    Mechanical properties

    Section, mm σU, MPa HB, MPa
    Approximate data on the time resistance to tensile and hardness in the walls of castings according to GOST 1412-85, STP М319-95
    15 ≥200 ≤230
    Castings in cast or heat treated condition for STP М319-95
    - ≥200 170-241
    Approximate data on the time resistance to tensile and hardness in the walls of castings according to GOST 1412-85, STP М319-95
    150 ≥120 ≤143
    Part of the connecting piping (sand casting) according to GOST 5525-88 (NV - in the center of a wall)
    - ≥150 ≤250
    Approximate data on the time resistance to tensile and hardness in the walls of castings according to GOST 1412-85, STP М319-95
    30 ≥160 ≤216
    4 ≥270 ≤255
    50 ≥140 ≤170
    8 ≥220 ≤240
    80 ≥130 ≤163

    Description mechanical marks

    Name Description
    σU Limit short-term strength
    HB Brinell hardness number

    Physical characteristics

    Temperature Е, HPa r, kg/m3 l, W/(m · °C) С, J/(kg · °C)
    20 85-110 7100 54 480

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    l Coefficient of thermal conductivity

    Technological properties

    Name The value
    Microstructure Pearlitic perlito-ferritic, ferrite-pearlitic. Graphite plate small, medium and large.