Steel 20H23N18 (ЭИ417)

  • Steel 10Х11Н20Т2Р (ЭИ696А)
  • 10X23H10 steel
  • Steel 10Х23Н18 (0Х23Н18)
  • Steel 12Х25Н16Г7АР (ЭИ835)
  • Steel 20X23H18 (EI417)
  • Steel 40Х10С2М (ЭИ107)
  • Steel 40Х9С2 (4Х9С2)
  • Steel 45Х22Н4М3 (EP48)
  • Steel 55Kh20G9AN4 (EP303)

    • Designation

    Name The value
    Designation GOST Cyrillic 20Х23Н18
    Designation GOST Latin 20X23H18
    Transliteration 20H23N18
    By chemical elements 20Cr23Н18
    Name The value
    Designation GOST Cyrillic ЭИ417
    Designation GOST Latin EI417
    Transliteration EhI417
    By chemical elements -

    Description

    20KH23N18 steel is used: for the manufacture of forgings, tires for operation at 650−700 °C; details of combustion chambers, clamps, suspension and other details of fixing boilers, muffles for operation at temperatures up to +1100 °C; seamless pipes; pipes and fittings installations of methane conversion and pyrolysis; various heat resistant parts aerospace; repair welded joints of equipment in radioactive environments; solid-rolled rings for different purposes.

    Note

    Heat-resistant steel and heat resistant austenitic class.
    The recommended maximum operating temperature for a long time +1000 °C.
    Temperature intense scaling in air +1050 °C.
    In the temperature range 600−800 °C is prone to embrittlement due to the formation of σ-phase.

    Standards

    Name Code Standards
    Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
    Sheets and strips В23 GOST 19903-74, GOST 19904-90, GOST 103-2006, GOST 19903-90
    Sheets and strips В33 GOST 4405-75, GOST 5582-75, GOST 7350-77, TU 14-1-2186-77
    Tape В34 GOST 4986-79
    Classification, nomenclature and General rules В30 GOST 5632-72
    Bars and shapes В32 GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, OST 1 92049-76, TU 14-1-377-72, TU 14-1-3957-85, TU 14-11-245-88
    Blanks. Of the workpiece. Slabs В21 OST 1 90176-75
    Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-565-84
    Welding and cutting metals. Soldering, riveting В05 OST 95 10441-2002
    Thermal and thermochemical treatment of metals В04 STP 26.260.484-2004
    Processing of metals by pressure. Forgings В03 STP М386-79
    Steel pipes and fittings to them В62 TU 14-158-135-2003

    Chemical composition

    Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
    TU 14-1-2186-77 ≤0.18 ≤0.02 ≤0.035 ≤2 22-25 ≤1 17-20 Rest ≤0.3 ≤0.2 ≤0.2 ≤0.3 ≤0.2
    GOST 5632-72 ≤0.2 ≤0.02 ≤0.035 ≤2 22-25 ≤1 17-20 Rest ≤0.3 ≤0.2 ≤0.2 ≤0.3 ≤0.2
    Fe is the basis.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, % d4 y, %
    Ring forged in OST 1 92049-76. Annealing in air or in water with 1040-1060 °C
    25 ≥245 ≥570 ≥26 - ≥40
    A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
    - ≥215 ≥255 ≥24 - ≥67
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥330 590-630 12-18 - 28
    Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air from 1050-1080 °C (samples)
    0.2-2 - ≥570 - ≥38 -
    A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
    - ≥135 ≥135 ≥37 - ≥77
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥205 340-390 11-15 - 16-21
    Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air from 1050-1080 °C (samples)
    0.2 - ≥570 - ≥19 -
    A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
    - ≥64 ≥71 ≥49 - ≥77
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥320 510-550 5-6 - 8-10
    Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Quenching in water or air with 1080-1150 °C
    - ≥245 ≥510 ≥35 - -
    A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
    - ≥39 ≥44 ≥51 - ≥70
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥195 285-330 4-5 - 5-8
    Hot rolled sheet (4,0-50,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Quenching in water from 1030-1130 °C
    - ≥265 ≥540 ≥35 - -
    A sample with a diameter of 10 mm and a length of 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
    - ≥22 ≥27 ≥27 - ≥31
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥275 580-620 14-28 - 20-39
    Bars hot rolled and forged according to GOST 5949-75. Annealing in air or in water 1100-1150 °C
    ≥196 ≥490 ≥35 - ≥50
    Bars with a diameter of 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h)
    - 295-320 600-660 29-35 - 47-54
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥175 340-370 5-10 - ≥20
    Bars hot rolled and forged at STP 26.260.484-2004. Quenching in water or air from 1100-1150 °C
    ≥270 ≥550 ≥35 - ≥40
    Bars with a diameter of 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h)
    - 235 520-540 25-28 - 45-49
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥175 ≥390 14-19 - 23-24
    Cold-rolled tubes after austenization on delivery
    - ≥529 ≥35 - -
    Bars with a diameter of 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h)
    - 225 540 24-32 - 39-45
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥195 ≥460 22 - 33-43
    Pipe. Annealing in air or in water 1100-1150 °C
    21260 ≥200 ≥500 ≥35 - ≥50
    Bars with a diameter of 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h)
    - 210 520-540 25-31 - 41-45
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥295 ≥640 26-35 - 29-42
    Forming at OST 1 90176-75. Quenching in water or air from 1100-1150 °C
    ≥245 ≥569 ≥35 - ≥50
    Bars with a diameter of 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h)
    - ≥195 ≥440 ≥24 - ≥46
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥145 ≥185 6-8 - 12-16
    Bars with a diameter of 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h)
    - 185-195 315-330 19-24 - ≥35
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥315 590-630 17-32 - 20-39
    Bars with a diameter of 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h)
    - 165 185-205 19-27 - ≥34
    Bars section 38-55 mm. Quenching in water from 1180 °C + Ageing at 800 °C (exposure 4 h) (indicated temperature and time of heat exposure)
    - ≥195 ≥470 18-25 - 29-35
    - ≥185 ≥350 8-12 - 15-17
    - ≥135 ≥185 7-10 - 13-18

    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
    d4 Elongation after rupture
    y The relative narrowing

    Physical characteristics

    Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
    0 200 7900 14 1000 - -
    20 204 7900 138 1000 - -
    300 182 - 19 - 166 538
    400 176 7760 - - 173 -
    500 170 7720 22 - 175 -
    600 160 7670 217 - 1785 -
    700 150 7620 - - 179 -
    800 141 - - - - -
    900 - 7540 - - 179 -
    100 - - 16 - 149 538
    200 - - - - 157 -

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    r Density
    l Coefficient of thermal conductivity
    R UD. the resistivity
    a The coefficient of linear expansion

    Technological properties

    Name The value
    Weldability limited weldability. For repair of welded joints of equipment, working in radioactive environments, we recommend the use of manual TIG welding with non-consumable electrode (filler or without filler material) and manual arc welding with coated electrodes.
    The temperature of forging Beginning - 1220 °C, the end of - 900 °C. the cross Sections up to 350 mm cooled in air.
    Machinability In the normalized and tempered condition when HB 178 and blower SB=610 MPa Kn b.St.=0.4
    Features of heat treatment Steel products, designed for operation in conditions of increased requirements for heat resistance and heat resistance, are subjected to quenching in water or air at 1100-1150 °C. the holding Time at the heating for hardening to products with a wall thickness up to 10 mm - 30 min, over 10 mm - 20 min + 1 min per 1 mm maximum thickness.