Alloy ХН35ВБ (ЭП912)

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    • Designation

    Name The value
    Designation GOST Cyrillic ХН35ВБ
    Designation GOST Latin XH35BB
    Transliteration HN35VB
    By chemical elements CrNi35ВBe
    Name The value
    Designation GOST Cyrillic ЭП912
    Designation GOST Latin EP912
    Transliteration EhP912
    By chemical elements -

    Description

    Alloy ХН35ВБ used: for the manufacture of parts of pipelines, gas systems aerospace engineering.

    Note

    Heat-resistant and heat-resistant alloy of iron-Nickel basis.
    The recommended maximum operating temperature for a long time +950−1000 °C.

    Standards

    Name Code Standards
    Bars and shapes В32 TU 14-1-4222-86
    Blanks. Of the workpiece. Slabs В31 TU 14-1-4223-87
    Steel pipes and fittings to them В62 TU 14-3-1583-88

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe B Nb W Nd
    TU 14-1-4222-86 ≤0.08 ≤0.015 ≤0.015 ≤0.5 13-15 ≤0.5 34-38 Rest ≤0.005 0.6-1.2 9-11 ≤0.4
    TU 14-1-4223-87 ≤0.08 ≤0.015 ≤0.015 ≤0.5 13-15 ≤0.5 34-38 Rest ≤0.005 0.8-1.2 9-11 ≤0.4
    Fe is the basis.
    According to TU 14-1-4223-87 and According to TU 14-1-4222-86, the chemical composition is presented for the alloy KhN35VB-VD (EP912-VD) for vacuum-arc remelting and KhN35VB-ID (EP912-ID). In the finished metal, deviations from the indicated chemical composition are allowed: for niobium ± 0.10%, for chromium -0.30%, for tungsten -0.20%. Instead of niodim, lanthanum is allowed to be introduced into the metal in the same quantities. Neodymium (lanthanum) and boron are introduced into the metal by calculation and chemical analysis are not determined.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, %
    Pipe forged billet according to TU 14-1-4223-87. Annealing in air from 1100-1150 °C (exposure of 20-40 min.) (longitudinal samples)
    20-25 ≥196 ≥540 ≥30 ≥50

    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

    Technological properties

    Name The value
    Pressure treatment Of forging of billets with a diameter of 180 mm on the other 14-1-4223-87 must be at least 2.5. For diameters of the workpiece 215 and 250 mm clan are not specified.
    Macrostructure and pollution The macrostructure of alloy tube billets TU 14-1-4223-87 on cross etched templeto should not have podsadecki porosity, subcortical bubbles, forging cracks, foreign metal and non-metallic microflute and other defects are visible without using the magnifying devices. Contamination of the alloy workpieces of non-metallic inclusions shall not exceed the maximum score: - oxides of stroke (OS) - 1.5 points; - point oxides (FROM) - 1.5 points; - the silicates fragile (CX) - 1.5 points; - the silicates plastic (SP) - 1.5 points; - the non-deformable silicates (SN) - 1.5 points; - sulphides (C) - 1.5 points; - for nitrides and carbonitrides point (NT) - 4.0 GPA - nitrides and carbonitrides stroke (HC) To 4.0 points.