Alloy KHN65MVU (ЭП760)

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    • Designation

    Name The value
    Designation GOST Cyrillic ХН65МВУ
    Designation GOST Latin XH65MBU
    Transliteration HN65MVU
    By chemical elements CrNi65CuВУ
    Name The value
    Designation GOST Cyrillic ЭП760
    Designation GOST Latin EP760
    Transliteration EhP760
    By chemical elements -

    Description

    Alloy KHN65MVU used: for the manufacture of welded structures chemical equipment operating at high temperatures in aggressive environments the redox nature (sulfuric acid, acetic acid, wet chlorine, chlorides, etc.); as a cladding layer in the manufacture of hot-rolled dual-layer corrosion-resistant sheets; warm seamless pipe for chemical equipment.

    Note

    Corrosion resistant alloy on a Nickel basis.
    The alloy is resistant to intergranular corrosion in aggressive environments.

    Standards

    Name Code Standards
    Sheets and strips В33 GOST 10885-85, GOST 24982-81, TU 14-1-3587-83
    Classification, nomenclature and General rules В30 GOST 5632-72
    Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-1214-75, TU 14-1-3768-84
    Test methods. Packing. Marking В09 RD 24.200.15-90
    Tape В34 TU 14-1-4253-87
    Bars and shapes В32 TU 14-11-245-88, TU 14-134-380-2000
    Steel pipes and fittings to them В62 TU 14-3-1227-83, TU 1380-001-08620133-05, TU 14-158-135-2003, TU 14-3-1320-85

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu Ti Mo W
    GOST 5632-72 ≤0.02 ≤0.012 ≤0.015 ≤1 14.5-16.5 ≤0.1 Rest ≤0.5 ≤0.3 ≤0.2 15-17 3-4.5
    TU 14-3-1320-85 ≤0.02 ≤0.012 ≤0.015 ≤1 14.5-16.5 ≤0.1 Rest ≤0.5 - ≤0.2 15-17 3-4.5
    Ni is the basis.
    According to TU 14-3-1320-85, a tolerance of carbon content of +0.010% is allowed, for silicon +0.03%. The calculated content of modifiers and deoxidizers - magnesium, cerium, aluminum - is established by technological instructions and their residual content in the metal is not determined by chemical analysis.
    According to TU 14-1-3587-83, a deviation in silicon of +0.010% is allowed. When melting alloy ХН65МВУ (ЭП760) electrolytic refined chrome is used. When ensuring the requirements of specifications, the use of chromium, obtained by other methods, is allowed.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, %
    Sheet hot rolled state of delivery on the other 14-1-3587-83
    ≥440 ≥850 ≥40
    Steel hot-rolled sheet (4.0 to 11.0 mm) in the delivery state according to GOST 24982-81. Quenching in water, under a water shower or air 1050-1090 °C
    4-11 ≥440 ≥830 ≥35
    Warm seamless tubes in the delivery condition on the other 14-3-1320-85 after heat treatment and etching
    - ≥372 ≥784 ≥40
    Cold-rolled tubes after austenization on delivery
    - ≥833 ≥40

    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

    Physical characteristics

    Temperature r, kg/m3
    20 9300

    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
    Particularities of production of goods Pipe on the other 14-3-1320-85 must withstand the test of flattening to the distance between clusively planes (N) in millimeters, is equal to N=1,08 S/0,08+S/D, where S is wall thickness of pipe, mm; D - nominal outside diameter of pipe, mm. When unsatisfactory test flattening of the pipe shall be tested for flattening to the distance between clusively planes (N) in millimeters, is equal to N=0.5 D + 2S. The pipes should withstand the test distribution to increase the outer diameter of the pipe by 10%. Tubes shall withstand hydraulic pressure in accordance with GOST 3845, when allowable voltage equal to 40% of the temporary tear resistance. The ability of pipe to withstand hydraulic pressure is provided by the technology without testing. The pipes undergo ultrasound in the hardware configuration on the test specimen with artificial defects applied on the inner and outer surface, to a depth of 10% of the nominal wall thickness and a length of 25 mm.
    Corrosion resistance Pipe supplied under THAT 14-3-1320-85 must pass the test at IWC.
    The tendency to intergranular corrosion Test the propensity of the alloy to intergranular corrosion produced on samples exposed to provocative to heating at 800 °C for 30 minutes with air cooling and subsequent quarters of the sample for 48 hours in 30% sulfuric acid (GOST 4204) supplemented with 40 g/l of iron sulfate (GOST 9485). The production of samples, preparation for testing, testing and evaluation of the propensity to intergranular corrosion according to GOST 6032. Evaluation of tendency to intercrystalline corrosion of sheets with a thickness of 10 mm or more is permitted by metallographic methods.