Alloy ХН46Б (ЭП350; 0Х20Н46Б)

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    • Designation

    Name The value
    Designation GOST Cyrillic ХН46Б
    Designation GOST Latin XH46B
    Transliteration HN46B
    By chemical elements CrNi46Be
    Name The value
    Designation GOST Cyrillic ЭП350
    Designation GOST Latin EP350
    Transliteration EhP350
    By chemical elements -
    Name The value
    Designation GOST Cyrillic 0Х20Н46Б
    Designation GOST Latin 0X20H46B
    Transliteration 0H20N46B
    By chemical elements 0Cr20Ni46Be

    Description

    Alloy ХН46Б used: for the manufacture of pipe systems for steam generators; water systems and steam heating in contact with water with high content of ions of chlorine and oxygen; a tube blank 180−190 mm ø for the production of thin-walled electropolishing pipes.

    Standards

    Name Code Standards
    Bars and shapes В32 TU 14-1-516-73
    Blanks. Of the workpiece. Slabs В31 TU 14-1-693-73
    Steel pipes and fittings to them В62 TU 14-3-1202-83, TU 14-3-145-73

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Nb
    TU 14-1-693-73 ≤0.06 ≤0.02 ≤0.025 ≤0.8 19-21 ≤0.5 44-48 Rest 0.8-1.2
    Ni is the basis.
    According to TU 14-1-693-73, the chemical composition is given for an alloy of grade ХН46Б (ЭП350). Deviations in chemical composition are allowed: carbon +0.010%, niobium ± 0.10%, chromium ± 0.50%, manganese +0.20%, silicon +0.10%.
    According to TU 14-1-516-73, the chemical composition is given for an alloy of grade ХН46Б (ЭП350).

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, %
    Tubular billet on the other 14-1-693-73. Quenching in water from 1050-1080 °C
    ≥206 ≥540 ≥30
    - ≥147 -

    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
    Weldability Limited weldable alloy. For welding apply welding wire of grade SV-03Х20Н45Г6М6Б (ЭП953).
    Macrostructure and pollution Macrostructure of steel billets on the other 14-1-693-73 on cross etched templeto selected from the head part of the ingot should not be visible without using the magnifying devices of the bubbles, captivity, cracks, fistulas, inclusions, podsadecki segregation. The degree of development of the Central porosity, point heterogeneity and phase separation of the square should not exceed 1 score for each parameter for the alloy of electroslag remelting and 2 points for alloy smelting open. Contamination of alloy, non-metallic inclusions on the average score for the alloy ESR shall not exceed: plastic silicates and sulphides 1.0 points, oxides of stroke and non-deformable silicates (globular) 1.5 points, oxides of point 2.0 points, silicates fragile-2.5 points; for open alloy smelting should not exceed: plastic silicates and sulphides 1.5 points, oxides of stroke 2.0 points, oxides point, silicates fragile 2.5 points, silicates, non-deformed (globular) 3.5 points.
    Corrosion resistance The workpiece must be able to withstand the test of intercrystalline corrosion according to the method of AM - GOST 6032 subgroup And the samples quenched in water from a temperature 1050-1080 °C With provoking heated for 1 hour to 650 °C.