Alloy KHN28VMAB (ЭП126; ВЖ100)

  • Alloy BXH1
  • Alloy KhN28VMAB (EP126; VZh100)

    • Designation

    Name The value
    Designation GOST Cyrillic ХН28ВМАБ
    Designation GOST Latin XH28BMAB
    Transliteration HN28VMAB
    By chemical elements CrNi28ВCuAlBe
    Name The value
    Designation GOST Cyrillic ЭП126
    Designation GOST Latin EP126
    Transliteration EhP126
    By chemical elements -
    Name The value
    Designation GOST Cyrillic ВЖ100
    Designation GOST Latin BZh100
    Transliteration VG100
    By chemical elements ВFe100

    Description

    Alloy KHN28VMAB used: for the manufacture of sheet metal components for turbines and other parts in power engineering; welding wire used for welding parts and welding of steel structures in energy engineering; welding electrodes; rings welded and wrought for various purposes for the aviation industry.

    Note

    Heat-resistant alloy based on Nickel-iron.
    The recommended maximum operating temperature for a long time + 800−1000 °C. the Temperature of intensive scaling in air +1100 °C.

    Standards

    Name Code Standards
    Sheets and strips В33 GOST 24982-81, TU 14-1-1747-76
    Classification, nomenclature and General rules В30 GOST 5632-72
    Bars and shapes В32 OST 1 92049-76, TU 14-1-192-72, TU 14-1-21-71, TU 14-11-245-88
    Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, OST 1 90253-77, OST 1 90279-79, OST 1 90346-83, TU 14-1-1214-75
    Thermal and thermochemical treatment of metals В04 ST ЦКБА 016-2005
    Tape В34 TU 14-1-1008-74
    Processing of metals by pressure. Forgings В03 TU 14-1-1530-75, TU 14-1-2902-80
    Welding and cutting metals. Soldering, riveting В05 TU 14-1-997-74, TU 14-1-997-2012

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu N V B Ti Mo Nb W
    TU 14-1-997-74 ≤0.1 ≤0.02 ≤0.02 ≤1.5 19-22 ≤0.6 25-30 Rest - 0.15-0.3 - ≤0.005 - 2.8-3.5 0.7-1.3 4.8-6
    GOST 5632-72 ≤0.1 ≤0.02 ≤0.02 ≤1.5 19-22 ≤0.6 25-30 Rest ≤0.3 0.15-0.3 - ≤0.005 ≤0.2 2.8-3.5 0.7-1.3 4.8-6
    TU 14-1-192-72 ≤0.1 ≤0.02 ≤0.02 ≤1.5 19-22 ≤0.6 25-30 Rest ≤0.3 ≤0.3 - ≤0.005 ≤0.2 2.8-3.5 0.7-1.3 4.8-6
    TU 14-1-2902-80 ≤0.1 ≤0.02 ≤0.02 ≤1.5 19-22 ≤0.6 25-30 Rest ≤0.3 ≤0.3 - ≤0.005 ≤0.2 2.8-3.5 0.7-1.3 4.8-6
    TU 14-1-1747-76 ≤0.1 ≤0.02 ≤0.02 ≤1.5 19-22 ≤0.6 25-30 Rest ≤0.2 0.15-0.3 ≤0.2 ≤0.005 - 2.8-3.5 0.7-1.3 4.8-6
    Fe is the basis.
    According to GOST 5632-72 and TU 14-1-1747-76 the chemical composition is given for the alloy grade KhN28VMAB. For grade ХН28ВМАБ-ВД (ЭП126-ВД) the content of N% ≤ 0.30%.
    According to TU 14-1-2902-80 and TU 14-1-192-72 the chemical composition is given for ХН28ВМАБ-ВД (ЭП126-ВД).

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % d4 y, % KCU, kJ/m2
    Blank pieces of pipe fittings and welded assemblies at ST CKBA 016-2005. Hardening in air, 1100-1120 °C (extract of 1.5-2.0 min/mm the largest section)
    ≥343 ≥735 ≥30 - ≥40 ≥784
    Hardening in air, 1050-1130 °C
    - ≥640 ≥32 - ≥40 ≥780
    - ≥196 ≥50 - ≥40 -
    - ≥685 ≥32 - ≥40 ≥833
    - ≥196 ≥52 - ≥50 -
    Ring welded of alloy grade KHN28VMAB at OST 1 90253-77. Annealing in air 1110-1150 °C
    - ≥736 ≥30 - - -
    - ≥657 ≥12 - - -
    Ring forged from alloy grade KHN28VMAB-VD at OST 1 92049-76. Hardening in air, 1050-1130 °C
    25 - ≥685 ≥27 - ≥34 ≥657
    Tape supplied on the other 14-1-1008-74
    - - ≥930 - ≥25 - -
    Steel cold-rolled sheet (0.8 to 3.9 mm) and HR (2.0 to 11.0 mm) in the delivery state according to GOST 24982-81. Quenching in water, under a water shower or air 1080-1140 °C
    ≤3.9 - ≤930 ≥35 - - -
    ≤3.9 - ≥165 ≥30 - - -
    4-11 - ≤930 ≥25 - - -
    4-11 - ≥195 ≥40 - - -
    Forgings. Annealing in air 1110-1150 °C
    - ≥740 ≥30 - ≥40 ≥780
    - ≥196 ≥50 - ≥35 -

    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
    d4 Elongation after rupture
    y The relative narrowing
    KCU Toughness

    Technological properties

    Name The value
    Features of heat treatment Welded assemblies of steel grade KHN28VMAB needs to be heat treated to relieve welding stresses at temperatures from 950 °C to 1000 °C. After welding, the nodes with small section welded joints (3-5 mm) heat treatment not subjected to. Aging at the temperature quenching rate of not less than 2.5 min per 1 mm of maximum wall thickness. Fit welded Assembly to a heat treatment to produce in a furnace, heated to a temperature of not higher than 500 °C; welded Assembly with cladding of Stellite subjected to heat treatment immediately after welding, it is allowed to load into the oven, heated to a temperature not exceeding 600 °C. Heat treatment of welded assemblies, where allowed reduced compared to the base metal strength of weld and stress relief is not required, it is allowed to produce, in addition to Assembly operating at cryogenic temperatures.