Steel 20KH3MVF (ЭИ415)

  • Steel 15Kh5M (X5M)
  • 30Cr3MA steel
  • 30Kh3VA steel
  • Steel 25X5M
  • Steel 25Kh3MFA-A
  • Steel 25Kh3MFA (48TS-4)
  • Steel 25Kh2MFA (48TS-1)
  • Steel 25Kh2M1F (EI723)
  • Steel 25Х1МФ (ЭИ10)
  • Steel 20Х3МВФ (ЭИ415)
  • Steel 20Х1М1Ф1ТР (EP182)
  • Steel 18Kh3MV (EI578)
  • Steel 18Kh2MFA-A
  • Steel 18Kh2MFA (48TS-3)
  • 15CrM Steel
  • Steel 15X5VF (X5VF)
  • Steel 15X5 (X5)
  • Steel 15Kh2MFA-A
  • Steel 15Kh2MFA (48TS-3-40)
  • Steel 13X9M (X9M)
  • Steel 13Х3Н3М2ВФБ (VKS-10)
  • 12XM steel
  • Steel 12Kh8VF (1Kh8VF)
  • Steel 12X8 (1X8)
  • Steel 12Kh2MFA-A
  • Steel 12Х2МФА (48ТС-2)
  • Steel 12Kh1MF (12KhMF; 12KhMFA)
  • 12MX steel
  • Steel 08Х16Н9М2

    • Designation

    Name The value
    Designation GOST Cyrillic 20Х3МВФ
    Designation GOST Latin 20X3MBF
    Transliteration 20H3MVF
    By chemical elements 20Cr3MoWV
    Name The value
    Designation GOST Cyrillic ЭИ415
    Designation GOST Latin EI415
    Transliteration EhI415
    By chemical elements -

    Description

    20KH3MVF steel is used: for the manufacture of rotors, discs, forgings, bolts, high pressure pipe for chemical apparatus, and hydrogenation plants, special fasteners and other parts operating at temperatures up to +540−560 °C; piping details with quenching in oil and tempering to the air; tubes for plants of chemical and petrochemical plants with nominal pressure PN=19.6−98 MPa (200−1000 kgf/cm2) nitrided parts of the aviation industry; billets of shafts and one-piece rotors stationary and transport steam turbines.

    Note

    The case hardening steel of pearlitic class.
    Temperature intense scaling +600 °C.

    Standards

    Name Code Standards
    Sheets and strips В23 GOST 103-2006
    Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006
    Sheets and strips В33 GOST 4405-75, TU 14-1-702-73
    Bars and shapes В32 GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 20072-74, TU 14-1-2090-77, TU 14-1-3957-85, TU 14-11-245-88
    Classification, nomenclature and General rules В20 OST 1 90005-91
    Blanks. Of the workpiece. Slabs В31 OST 1 90157-74
    Blanks. Of the workpiece. Slabs В21 OST 1 90176-75
    Processing of metals by pressure. Forgings В03 OST 26-01-135-81, TU 108-1029-81
    Thermal and thermochemical treatment of metals В04 ST ЦКБА 026-2005
    Steel pipes and fittings to them В62 TU 14-3Р-251-2007, TU 14-3-251-74

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
    TU 108-1029-81 0.17-0.24 ≤0.022 ≤0.025 0.25-0.6 2.4-3.3 ≤0.4 ≤0.5 Rest ≤0.25 0.6-0.85 - 0.35-0.55 0.3-0.5
    TU 14-3Р-251-2007 0.15-0.23 ≤0.025 ≤0.03 0.25-0.5 2.8-3.3 0.17-0.37 ≤0.3 Rest ≤0.2 0.6-0.85 - 0.35-0.55 0.3-0.5
    TU 14-1-2090-77 0.15-0.2 ≤0.025 ≤0.03 0.25-0.5 2.8-3.3 0.17-0.37 ≤0.5 Rest ≤0.3 0.6-0.85 - 0.35-0.55 0.3-0.5
    GOST 20072-74 0.15-0.23 ≤0.025 ≤0.03 0.25-0.5 2.8-3.3 0.17-0.37 ≤0.3 Rest ≤0.2 0.6-0.85 ≤0.03 0.35-0.55 0.3-0.5
    Fe is the basis.
    According to GOST 20072-74, when steel is scrap-process, the content of Cu ≤ 0.30%. The presence of titanium is up to 0.030%. When smelting steel by the method of electroslag remelting, the mass fraction of sulfur should not be more than 0.015%.
    According to TU 108-1029-81, the chemical composition is given for steel grade 20Х3МВФА (ЭИ415А). In the workpieces, deviations in the content of the elements indicated in the table are allowed: carbon ± 0.010%, silicon + 0.030%. For metal VDP, the deviation of manganese content +0.10% / - 0.15% is allowed. The deviation of the silicon content in the metal VDP and ESR is allowed within ± 0.050%. In the ESR steel, the sulfur content should not be more than 0.015%.
    According to TU 14-1-2090-77, the chemical composition is given for steel grade 20X3MVF (EI415). In steel grade 20Х3МВФ-Ш (ЭИ415-Ш) the sulfur content should not be more than 0,015%. If all the requirements of the specification are met, deviations in chemical composition are allowed in accordance with table 2 of GOST 20072. The content of residual elements is allowed: nickel - no more than 0.50% and copper - no more than 0.30%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
    Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
    - 730-810 870-910 13 45-50 - - -
    Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
    - - - - - - 321-415 31-43.5
    Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
    - 700 780 12 55 - - -
    Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
    - - - - - - 302-363 28-39
    Billet shafts and rotors of steam turbines on the other 108-1029-81 (in the delivery condition specified strength and direction and place the cuttings sample)
    - 589-736 ≥736 ≥13 ≥40 ≥490 - -
    Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
    - 700 780 10 39 - - -
    Billet shafts and rotors of steam turbines on the other 108-1029-81 (in the delivery condition specified strength and direction and place the cuttings sample)
    - 589-736 ≥716 ≥11 ≥32 ≥390 - -
    Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
    - 660 720 10 33 - - -
    Blank pieces of pipe fittings. Quenching in oil from 1030-1080 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Vacation at 660-700 °C, air cooling
    ≤25 735-835 ≥880 ≥12 ≥40 ≥588 277-321 -
    Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
    - 580-610 600-630 - 44-52 - - -
    Blank pieces of pipe fittings. Quenching in oil from 1030-1080 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Vacation at 660-700 °C, air cooling
    ≤400 640-735 ≥735 ≥13 ≥40 ≥490 248-293 -
    Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
    - 510-550 530-560 10-12 44 - - -
    Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C
    - 620-650 730-750 11-13 32-40 392-491 - -
    Discs with a diameter of 600-1000 mm with a thickness of 100-150 mm. Quenching in oil from 1050 °C to + Vacation at 700 °C (sample Tangenziale)
    - 480-500 490-540 11 27-40 - - -
    Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C
    ≤25 ≥750 ≥900 ≥12 ≥40 ≥589 - -
    A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥49 ≥72 ≥56 ≥100 - - -
    Bars hot rolled and forged on the other 14-1-2090-77. The longitudinal samples. Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C (delay of 1-3 h), air cooling
    ≥735 ≥880 ≥12 ≥40 ≥588 269-341 -
    A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥31 ≥49 ≥58 ≥100 - - -
    Bars hot rolled and forged on the other 14-1-2090-77. The longitudinal samples. Quenching in oil with 900-1950 °C + Vacation at 250-350 °C (exposure 2 hours), air cooling
    ≥885 ≥1080 ≥10 ≥55 ≥686 320-415 -
    A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥22 ≥45 ≥66 ≥100 - - -
    Rolled steel. Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C, air cooling
    ≤90 ≥735 ≥880 ≥12 ≥40 ≥579 - -
    A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥15 ≥26 ≥77 ≥100 - - -
    Seamless pipes for chemical and petrochemical industries in the state of delivery (indicate the cutting direction of sample)
    ≥490 ≥784 ≥12 - ≥490 241-285 -
    A sample with a diameter of 6 mm, length 30 mm, forged and normalized. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
    - ≥17 ≥27 ≥79 ≥100 - - -
    Seamless pipes for chemical and petrochemical industries in the state of delivery (indicate the cutting direction of sample)
    ≥490 ≥784 ≥14 - ≥590 241-285 -
    The forging of the rotor 47 so that the barrel diameter is mm. 965-1075 Normalization at 1050 °C + Quenched in oil from 1000 °C + Vacation at 670 °C, cooling with the furnace to 150 °C then in air (samples tangential)
    - 590-690 690-780 12-18 41-68 - - -
    Forming at OST 1 90176-75. Quenching in oil with 1030-1060 °C + Vacation at 660-700 °C (aging for 1 h), air cooling
    ≥735 ≥883 ≥12 ≥40 ≥588 285-331 -
    The forging of the rotor 47 so that the barrel diameter is mm. 965-1075 Normalization at 1050 °C + Quenched in oil from 1000 °C + Vacation at 670 °C, cooling with the furnace to 150 °C then in air (samples tangential)
    - 510-600 600-680 11-15 54-61 - - -
    - 500-590 550-560 13-16 57-65 - - -
    - 450-570 470-570 15-20 69-72 - - -
    - 400-510 410-520 12-21 65-80 - - -
    - 340-450 360-460 18-23 70-84 - - -

    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
    HRC Rockwell hardness (indenter diamond spheroconical)

    Physical characteristics

    Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
    0 207 7800 - - - -
    20 207 7800 385 - - -
    100 204 - 36 398 106 502
    300 193 - 32 544 118 610
    400 186 7690 31 640 121 650
    500 182 7660 30 743 126 710
    600 117 7620 29 859 126 710
    700 171 - 29 982 - -
    800 164 - - - 13 750

    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 limited weldability. Welding methods: RDS - necessary heating and subsequent heat treatment, the CCC.
    The temperature of forging Start - 1240 °C, the end - 780 °C. the cross Sections up to 50 mm are cooled in boxes, 51-700 mm is subjected to annealing, one hypothermia.
    Machinability In the annealed condition with blower SB 157 HB=530 MPa Kn TV.SPL.=1.5 Kn b.St.=1.1