Steel 25Х2М1Ф (ЭИ723)

Designation

Name The value
Designation GOST Cyrillic 25Х2М1Ф
Designation GOST Latin 25X2M1F
Transliteration 25H2M1F
By chemical elements 25Cr2Mo1V
Name The value
Designation GOST Cyrillic ЭИ723
Designation GOST Latin EI723
Transliteration EhI723
By chemical elements -

Description

25Х2М1Ф steel is used: for the manufacture of special fasteners (fasteners with special properties), operating at temperatures up to +535 °C; flat springs, bolts, pins, nuts, and other parts; fasteners turbines and flange connections, steam pipes and fittings, operating at a steam temperature +500−580 °C (by cold machining and hot forming); fasteners of nuclear power plants.

Note

Steel pearlitic class.

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
Bars and shapes В32 GOST 7417-75, GOST 8559-75, GOST 8560-78, TU 14-1-1397-75, TU 14-1-5037-91, TU 14-1-552-72
Processing of metals by pressure. Forgings В03 GOST 8479-70, TU 0306.018-80, ST ЦКБА 010-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Mo
TU 14-1-1397-75 0.22-0.29 ≤0.025 ≤0.03 0.4-0.7 2.1-2.6 0.17-0.37 ≤0.3 Rest ≤0.2 0.3-0.5 0.9-1.1
TU 14-1-552-72 0.22-0.29 ≤0.025 ≤0.03 0.4-0.7 2.1-2.6 0.17-0.37 ≤0.25 Rest ≤0.3 0.3-0.5 0.9-1.1
Fe is the basis.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Forgings. Normalizing + tempering + vacation
100-300 490 655 13 40 540 212-248
100-300 590 735 13 40 490 235-277
100-300 685 835 12 35 490 262-311
100 685 835 13 42 590 262-311
Normalization at 1030-1060 °C + vacation 680-720 °C, air cooling
≤25 750 900 10 40 300 -
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
- 840 960 15 54 - -
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 [81]
- 265 275 29 72 - -
Bars hot rolled and forged (12-180 mm) round and square. Normalization at 1030-1050 °C + a normalization at the 950-970 °C to + leave at 680-720 °C, air cooling
670 780 12 50 490 -
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
- 610 640 14 59 - -
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 [81]
- 255 265 35 86 - -
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
- 810 910 13 54 - -
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 [81]
- 215 225 34 90 - -
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
- 580 600 15 60 - -
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 [81]
- 125 140 40 93 - -
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
- 720 850 14 58 - -
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 [81]
- 83 93 60 92 - -
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
- 530 580 15 66 - -
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 [81]
- 53 61 61 81 - -
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
- 570 700 18 66 - -
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 [81]
- 32 37 55 84 - -
Normalization of 1030-1050 °C, the release of 650 °C, exposure 6 hours (indicated temperature and time of heat exposure)
- 450 500 17 69 - -
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 [81]
- 27 28 58 100 - -
Bars. Normalization at 1030-1050 °C, air cooling + vacation at 650-660 °C (exposure 6 h), air cooling. At 20 °C NV=285-302
- 780-1050 880-110 11-21 39-70 - -
- 780-980 880-1010 13-18 38-60 - -
- 740-910 830-1010 12-14 51-62 - -
- 680-980 780-1080 12-17 48-60 - -
- 680-760 760-820 14-19 65-71 - -
- 640-720 690-770 15-19 70-76 - -
- 640-710 690-740 17 74 - -
- 640-710 680-730 16-18 69-76 - -
- 520-690 550-710 16-22 70-77 - -

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 G, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
0 217 82 7800 - 270 - -
20 223 - 7800 - 270 - -
100 211 79 7780 33 360 125 538
200 205 72 7750 32 420 129 575
300 200 74 7720 30 500 133 609
400 193 71 7680 29 590 137 634
500 186 66 7650 28 710 14 674
600 174 57 7600 264 840 14 676
700 175 - - - 970 - -
800 - - - - - 147 735

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 Does not apply to welded structures.
The temperature of forging Start - 1200 °C, the end - of 800 °C.
Machinability In the normalized and tempered condition in NV ?Blower SB 300=1030 MPa Kn TV.SPL.=0,25 Kn b.St.=0,60.