Alloy ХН40Б (ЭП337)

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    • Designation

    Name The value
    Designation GOST Cyrillic ХН40Б
    Designation GOST Latin XH40B
    Transliteration HN40B
    By chemical elements CrNi40Be
    Name The value
    Designation GOST Cyrillic ЭП337
    Designation GOST Latin EP337
    Transliteration EhP337
    By chemical elements -

    Description

    Alloy ХН40Б used: for the manufacture of rolled, used for production of parts and equipment for chemical, petrochemical and power engineering, chloresteral resistant to water vapour at temperatures of +200−350 °C.

    Standards

    Name Code Standards
    Blanks. Of the workpiece. Slabs В31 TU 14-1-1213-75, TU 14-1-3935-85
    Bars and shapes В32 TU 14-1-1746-76, TU 14-1-2000-77
    Steel pipes and fittings to them В62 TU 14-3-219-89

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe N Nb Co
    TU 14-1-1213-75 ≤0.2 ≤0.02 ≤0.01 1.5-2.5 18-20 ≤0.1 39-42 Rest ≤0.04 0.35-0.75 ≤0.02
    TU 14-1-3935-85 ≤0.2 ≤0.015 ≤0.01 1.5-2.5 18-20 ≤0.1 39-42 Rest ≤0.04 0.35-0.75 ≤0.02
    According to TU 14-1-1213-75 the chemical composition is indicated for alloy ХН40Б (ЭП337). For the alloys of grades ХН40Б-Ш and ХН40Б-ВД, the mass fraction of sulfur is ≤ 0.010%.
    According to TU 14-1-3935-85 the chemical composition is given for alloy ХН40Б (ЭП337). Metal processing is allowed up to 0.10% of the sum of the REM by calculation. In the alloy of electroslag and vacuum-arc remelting (Ш, ВД, ВИ + ВД and ВИ) the mass fraction of sulfur should not be more than 0,012%. Mass fraction of residual elements - in accordance with GOST 5632.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, %
    Billet hot rolled and forged in the delivery condition on the other 14-1-1213-75 (longitudinal samples)
    - ≥196 ≥519.4 ≥32
    - - ≥117.6 -
    Tubular billet on the other 14-1-3935-85. The longitudinal samples. Hardening in air, 1040-1060 °C
    20-25 ≥157 ≥490 ≥35
    20-25 ≥108 - -
    20-25 ≥196 ≥539 ≥32
    20-25 ≥137 - -

    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

    Technological properties

    Name The value
    Macrostructure and pollution In the macrostructure of billets on the other 14-1-3935-85 in the state of delivery should be free of cracks, delamination, subcortical bubbles, curled up crusts, traces of shrinkage, inclusions, visible to the naked eye. Assessment of the quality of the macrostructure of a metal are also in points. For billets of metal of all kinds of smelting the Central porosity, point heterogeneity and phase separation in the square should not exceed a score of 1.0 for each species. For pipe billets with a diameter more than 110 mm of metal open arc and vacuum-induction melting Central porosity, point heterogeneity and phase separation in the square should not exceed a score of 2.0 for each species.
    Corrosion resistance ХН40МДБ alloy has a high resistance against pitting and pitting corrosion, corrosion cracking in chloride and hydrogen sulfide-containing media.
    The tendency to intergranular corrosion Tubular billet on the other 14-1-3935-85 must withstand the test of intercrystalline corrosion.