Steel 20KH25N20S2 (ЭИ283)

  • Steel 10Х13СУ (ЭИ404)
  • Steel 15Kh18SU (EI484)
  • Steel 15Kh6Su (EI428)
  • Steel 20X23H13 (EI319)
  • Steel 20Х25Н20С2 (ЭИ283)
  • Steel 30Х13Н7С2 (ЭИ72)
  • Steel 36Х18Н25С2 (4Х18Н25С2)

    • Designation

    Name The value
    Designation GOST Cyrillic 20Х25Н20С2
    Designation GOST Latin 20X25H20C2
    Transliteration 20H25N20S2
    By chemical elements 20Cr25Н20С2
    Name The value
    Designation GOST Cyrillic ЭИ283
    Designation GOST Latin EI283
    Transliteration EhI283
    By chemical elements -

    Description

    20KH25N20S2 steel is used: for manufacturing parts of furnaces, operating at temperatures up to +1100 °C in air and hydrocarbon atmospheres; hangers and supports in boilers; pipe electrolysis and pyrolysis plants.

    Note

    Steel heat-resistant austenitic class.
    The recommended maximum operating temperature for a long time +1050 °C. the Temperature of intensive scaling in air +1100 °C.
    In the temperature range 600−800 °C is prone to embrittlement due to the formation of σ-phase.

    Standards

    Name Code Standards
    Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
    Sheets and strips В23 GOST 19903-74, GOST 19904-90, GOST 103-2006, GOST 19903-90
    Sheets and strips В33 GOST 4405-75, GOST 5582-75, TU 14-1-2186-77
    Classification, nomenclature and General rules В30 GOST 5632-72
    Bars and shapes В32 GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-11-245-88
    Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-1213-75
    Processing of metals by pressure. Forgings В03 STP М386-79
    Wire, steel, alloy В73 TU 14-1-5361-98

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
    GOST 5632-72 ≤0.2 ≤0.02 ≤0.035 ≤1.5 24-27 2-3 18-21 Rest ≤0.3 ≤0.2 ≤0.2 ≤0.3 ≤0.2
    Fe is the basis.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, %
    Rolled steel. Annealing in air or in water from 1100-1150 °C
    - ≥255 ≥520 ≥30 ≥47
    Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Quenching in water or air from 1050-1100 °C
    - - ≥490 ≥35 -
    Bars hot rolled and forged according to GOST 5949-75. Annealing in air or in water 1100-1150 °C
    ≥295 ≥590 ≥35 ≥50
    Rolled steel. Annealing in air or in water from 1100-1150 °C
    - ≥210 ≥490 ≥35 ≥50
    - ≥165 ≥320 ≥40 ≥55
    - ≥110 ≥195 ≥50 ≥63

    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
    y The relative narrowing

    Physical characteristics

    Temperature r, kg/m3 l, W/(m · °C) a, 10-6 1/°C
    0 7720 - -
    20 7720 - -
    100 7680 15 161
    800 7440 27 181
    900 7390 29 185
    500 - 22 -
    600 - 24 178
    700 - 25 178
    300 - - 161
    1000 - - 185
    1200 - - 188

    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
    Склонность к отпускной хрупкости inclined in the range of 600-800 With due to the formation of b-phase
    The temperature of forging Beginning - 1170 °C, the end - 850 °C air Cooling.