Alloy HN35VT (ЭИ612)

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    • Designation

    Name The value
    Designation GOST Cyrillic ХН35ВТ
    Designation GOST Latin XH35BT
    Transliteration HN35VT
    By chemical elements CrNi35ВTe
    Name The value
    Designation GOST Cyrillic ЭИ612
    Designation GOST Latin EI612
    Transliteration EhI612
    By chemical elements -

    Description

    Alloy HN35VT used: for the manufacture of disks, rotors, fasteners, flat springs are made by cold heading; blades and other turbine components operating at temperatures to +650 °C.

    Note

    High-temperature alloy, iron-Nickel basis.

    Standards

    Name Code Standards
    Sheets and strips В23 GOST 19904-90
    Classification, nomenclature and General rules В30 GOST 5632-72
    Blanks. Of the workpiece. Slabs В31 OST 3-1686-90
    Thermal and thermochemical treatment of metals В04 STP 26.260.484-2004, ST ЦКБА 016-2005
    Processing of metals by pressure. Forgings В03 TU 108.02.118-86, TU 14-1-1530-75, ST ЦКБА 010-2004
    Sheets and strips В33 TU 14-1-1528-76
    Bars and shapes В22 TU 14-1-1665-76
    Bars and shapes В32 TU 14-1-272-72, TU 14-11-245-88

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu Al Ti Mo W
    TU 14-1-1665-76 ≤0.12 ≤0.01 ≤0.025 1-2 14-16 ≤0.6 34-36 Rest ≤0.25 - 1.1-1.5 ≤0.3 2.8-3.5
    GOST 5632-72 ≤0.12 ≤0.02 ≤0.03 1-2 14-16 ≤0.6 34-38 Rest ≤0.3 - 1.1-1.5 ≤0.3 2.8-3.5
    TU 14-1-272-72 ≤0.12 ≤0.02 ≤0.02 1-2 14-16 ≤0.6 34-38 Rest - ≤0.5 1.1-1.5 - 2.8-3.5
    TU 14-1-1528-76 ≤0.12 ≤0.02 ≤0.03 1-2 14-16 ≤0.6 34-38 Rest ≤0.3 - 1.1-1.5 ≤0.3 2.8-3.5
    Fe is the basis.
    According to TU 14-1-1665-76, the chemical composition is given for the alloy grade KhN35VT-VD (EI612-VD). The deviation by the content of manganese is allowed to be -0.30%. In the finished product deviations from the established norms of chemical composition are allowed in accordance with GOST 5632. A technological additive REM is allowed. The residual aluminum content is allowed up to 0.50%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
    Blank pieces of pipe fittings and welded assemblies at ST CKBA 016-2005. Quenching in water from 1080-1100 °C (aging of 1.0-1.5 h for workpieces 90-150 mm to 1.5-2.5 h) + Aging at 850-900 °C (exposure for 10 h), air cooling + Ageing at 690-710 °C (extract 10-50 h), air cooling (single HN35VT allowed for Aging at 700 °C (aging for 50 h), air cooling)
    ≤650 ≥392 ≥735 ≥15 ≥25 ≥686 207-269
    Bars varietal HN35VT-VD (ЭИ612-VD) TU 14-1-1665-76. Austenization heating up to 1080-1100 °C, cooling in water + Aging at 840-860 °C (exposure for 10 h) + Aging at 700-710 °C (aging 35-50 h), air cooling
    ≥490 ≥830 ≥18 ≥40 ≥590 -
    A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥180 ≥185 ≥28 ≥49 - -
    Blank pieces of pipe fittings and welded assemblies at ST CKBA 016-2005. Quenching in water from 1080-1100 °C (aging of 1.0-1.5 h for workpieces 90-150 mm to 1.5-2.5 h) + Aging at 850-900 °C (exposure for 10 h), air cooling + Ageing at 690-710 °C (extract 10-50 h), air cooling (single HN35VT allowed for Aging at 700 °C (aging for 50 h), air cooling)
    ≤200 ≥490 ≥830 ≥18 ≥40 ≥588 207-269
    Bars varietal HN35VT-VD (ЭИ612-VD) TU 14-1-1665-76. Austenization heating up to 1080-1100 °C, cooling in water + Aging at 840-860 °C (exposure for 10 h) + Aging at 700-710 °C (aging 35-50 h), air cooling
    - ≥441 - - - -
    A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥98 ≥105 ≥67 ≥90 - -
    Forgings. Quenching in water from 1080-1100 °C + Aging 850 °C (exposure for 10 h), air cooling + Aging 700 °C (extract 25-50 HR), cooling with the oven up to 200-300 °C (indicated by the direction of fillet samples)
    125-250 ≥390 ≥730 ≥15 ≥25 ≥560 217-269
    Bars varietal HN35VT-VD (ЭИ612-VD) TU 14-1-1665-76. Austenization heating up to 1080-1100 °C, cooling in water + Aging at 840-860 °C (exposure for 10 h) + Aging at 700-710 °C (aging 35-50 h), air cooling
    - ≥441 - - - -
    A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥56 ≥60 ≥84 ≥96 - -
    Forgings. Quenching in water from 1080-1100 °C + Aging 850 °C (exposure for 10 h), air cooling + Aging 700 °C (extract 25-50 HR), cooling with the oven up to 200-300 °C (indicated by the direction of fillet samples)
    125 ≥390 ≥730 ≥15 ≥35 ≥560 217-269
    A sample with a diameter of 6 mm, length 30 mm, forged. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥30 ≥40 ≥90 ≥96 - -
    Forgings. Quenching in water from 1080-1100 °C + Aging 850 °C (exposure for 10 h), air cooling + Aging 700 °C (extract 25-50 HR), cooling with the oven up to 200-300 °C (indicated by the direction of fillet samples)
    125-250 ≥390 ≥730 ≥13 ≥20 ≥490 217-269
    Forgings of disks with a diameter 450-1000 mm, height mm. 180-275 Quenching in water from 1090 °C + Ageing at 850 °C (exposure for 10 h) + Aging at 700 °C (extract 25-40 h), cooling with the furnace (samples tangential)
    - 390-640 710-980 13-31 14-50 - -
    Bars and strip hot rolled and forged. Austenization heating up to 1080-1100 °C (aging of 1.0-1.5 h), cooling in water + Aging at 690-710 °C (extract 25-50 hours), air cooling
    ≥390 ≥740 ≥15 ≥35 ≥686 -
    Forgings of disks with a diameter 450-1000 mm, height mm. 180-275 Quenching in water from 1090 °C + Ageing at 850 °C (exposure for 10 h) + Aging at 700 °C (extract 25-40 h), cooling with the furnace (samples tangential)
    - 370-470 530-710 10-21 15-42 - -
    Bars and strip hot rolled and forged. Austenization heating up to 1080-1100 °C (aging of 1.0-1.5 h), cooling in water + Aging at 850-900 °C (exposure for 10 h), air cooling
    ≥390 ≥740 ≥15 ≥35 ≥686 -
    Forgings of disks with a diameter 450-1000 mm, height mm. 180-275 Quenching in water from 1090 °C + Ageing at 850 °C (exposure for 10 h) + Aging at 700 °C (extract 25-40 h), cooling with the furnace (samples tangential)
    - 350-460 490-670 7.5-19 14-37 - -
    Bars hot rolled and forged at STP 26.260.484-2004. Quenching in water with 1080-1000 °C to + First aging at 850-900 °C (exposure for 10 h) air cooling + Second aging at 700 °C (extract 10-50 h) air cooling
    ≥400 ≥750 ≥15 ≥25 - -
    Rolled steel with a diameter of 45-90 mm. Quenching in water from 1090 °C + Ageing at 850 °C (exposure for 10 h) + Aging at 700 °C (extract 25-40 h), air cooling or furnace
    - 430-620 780-850 18-30 30-55 - -
    Rolled steel. Quenching in water from 1080-1100 °C
    25 ≥500 ≥850 ≥18 ≥40 ≥600 -
    Rolled steel with a diameter of 45-90 mm. Quenching in water from 1090 °C + Ageing at 850 °C (exposure for 10 h) + Aging at 700 °C (extract 25-40 h), air cooling or furnace
    - 430-470 720-760 20.5 37-42 - -
    - 430-470 710-740 16-21 30-43 - -
    - 430-470 700-740 19-22 35-45 - -
    - 410-470 670-740 15-23 23-53 - -
    - 390-500 630-710 15-25 30-48 - -
    - 360-440 450-490 9-31 11-48 - -

    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
    KCU Toughness
    HB Brinell hardness number

    Physical characteristics

    Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C
    0 198 8164 - - -
    20 202 8160 - - -
    100 195 - 13 1020 148
    200 190 - 16 1050 151
    300 186 - 17 1100 155
    400 179 - 19 1120 159
    500 173 - 21 1150 161
    600 166 - 22 1160 166
    700 158 - 24 1170 166
    800 150 - 26 - 177
    900 - - - - 169

    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
    Weldability Difficult weldability. The welding process is SMAW, the electrodes KTI-762. To relieve welding stresses, the recommended subsequent heat treatment. The welding in the hardened state. Welded Assembly shall be subjected to aging.
    The temperature of forging Beginning - 1170 °C, the end - 850 °C air Cooling.
    Machinability In the heat treated condition in HB 269 and blower SB=951 MPa Kn TV.SPL.=0,30 Kn b.St.=0,15.
    Features of heat treatment Products and parts of chemical engineering of alloy HN35VT should termoobrabotki regime: quenching in water from 1080-1100 °C to + first aging at 850-900 °C With exposure for 10 hours and air cooling + second aging at 700 °C with an exposure of 10-50 hours and air cooling. The duration of the aging is determined by the titanium content. When the titanium content at the lower limit of 1.1-1.2% of the duration of aging of 50 hours, with a larger content of 25-40 hours. For forged rod from steel HN35VT-VD hardening should be performed at a temperature of from 1020 °C. to 1040°C.