Steel 12KH2N4A (ЭИ83)

Designation

Name The value
Designation GOST Cyrillic 12Х2Н4А
Designation GOST Latin 12X2H4A
Transliteration 12H2N4A
By chemical elements 12Cr2Н4
Name The value
Designation GOST Cyrillic ЭИ83
Designation GOST Latin EI83
Transliteration EhI83
By chemical elements -

Description

12KH2N4A steel is used: for the manufacture of hot rolled plates; gears, shafts, worms, dog clutch, piston pins and other case hardening of parts, which are requirements of high strength, ductility and toughness of core and high surface hardness, working under shock loads and at low temperatures; solid-rolled rings for different purposes; seamless tubes for aviation.

Note

The high quality stainless steel construction.
Case hardening steel.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, OST 1 92049-76, TU 14-1-1885-85, TU 14-1-2118-77, TU 14-1-2765-79, TU 14-1-658-73, TU 14-1-950-74, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Classification, nomenclature and General rules В20 OST 1 90005-91
Blanks. Of the workpiece. Slabs В21 OST 14-13-75
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-1265-75, TU 14-1-4944-90, TU 1-92-156-90
Sheets and strips В33 TU 14-1-1409-75
Steel pipes and fittings to them В62 TU 14-3-367-75, TU 14-3-572-77

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-1885-85 0.1-0.15 ≤0.015 ≤0.025 0.3-0.6 1.25-1.65 0.17-0.37 3.25-3.65 Rest ≤0.25 - - - -
TU 14-1-658-73 0.1-0.15 ≤0.025 ≤0.025 0.3-0.6 1.25-1.65 0.17-0.37 3.25-3.65 Rest ≤0.25 ≤0.05 ≤0.03 ≤0.15 ≤0.2
TU 14-1-2765-79 0.1-0.15 ≤0.012 ≤0.016 0.3-0.6 1.25-1.65 0.17-0.37 3.25-3.6 Rest ≤0.25 ≤0.1 ≤0.03 ≤0.15 ≤0.2
GOST 4543-71 0.09-0.15 ≤0.025 ≤0.025 0.3-0.6 1.25-1.65 0.17-0.37 3.25-3.65 Rest ≤0.3 ≤0.05 ≤0.03 ≤0.15 ≤0.2
Fe is the basis.
GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
According to TU 14-1-2765-79, the chemical composition is given for 12Х2Н4А-Ш steel (ЭИ83-Ш).
According to TU 14-1-950-86 the chemical composition is given for steel grade 12X2N4A.
According to TU 14-1-1885-85 the chemical composition is given for steel grade 12Х2Н4А-ВД (ЭИ83-ВД). To ensure the required grain size, it is allowed to introduce vanadium in the steel smelting at the rate of its content in steel no more than 0.10%, the content of which in steel is not determined. The presence of tungsten to 0.20%, molybdenum to 0.15%, titanium to 0.030% is not a defect. The allowable variation in manganese content in steel is ± 0.010%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Bars and strip hot rolled and forged. Quenching in oil from 780 °C to + Leave at 130 °C, air cooling
16-20 - ≥980 ≥1240 ≥10 ≥63 - ≥375 -
Bars and strip hot rolled and forged. Quenching in oil from 900 °C + vacation
- 200 ≥1240 ≥1560 - ≥49 ≥880 - -
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥99 ≥115 ≥35 ≥91 - - -
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - - - - - - 285-388 30-41
Ring forged in OST 1 92049-76. Quenching in oil with 760-800 °C + Vacation at 150-170 °C, cooling in oil or air
15 - ≥785 ≥980 ≥10 ≥47 ≥833 294-415 -
Bars and strip hot rolled and forged. Quenching in oil from 780 °C to + Leave at 130 °C, air cooling
25-40 - ≥860 ≥1180 ≥11 ≥64 - ≥355 -
Bars and strip hot rolled and forged. Quenching in oil from 900 °C + vacation
- 300 ≥1320 ≥1540 - ≥56 ≥740 - -
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥64 ≥80 ≥56 ≥96 - - -
Bars hot rolled, forged and calibrated. Quenching in oil with 775-805 °C + Vacation at 150-170 °C, air cooling
- ≥830 ≥1030 ≥7 ≥35 ≥590 293-415 -
Bars and strip hot rolled and forged. Quenching in oil from 780 °C to + Leave at 130 °C, air cooling
40-60 - ≥690 ≥1080 ≥13 ≥61 - ≥325 -
Bars and strip hot rolled and forged. Quenching in oil from 900 °C + vacation
- 400 ≥1200 ≥1320 - ≥59 ≥1030 - -
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥43 ≥54 ≥65 ≥100 - - -
Bars hot rolled, forged and calibrated. Quenching in oil with 775-805 °C + Vacation at 150-170 °C, air cooling
- ≥830 ≥1030 ≥12 ≥55 ≥980 293-415 -
Bars and strip hot rolled and forged. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
≤5 - ≥1080 ≥1270 ≥13 ≥60 - - ≥39
Bars and strip hot rolled and forged. Quenching in oil from 900 °C + vacation
- 500 ≥1130 ≥1200 - ≥62 ≥1250 - -
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥31 ≥42 ≥64 ≥100 - - -
Bars and strip hot rolled and forged. Quenching in oil with 790-810 °C + Vacation at 150-170 °C, air cooling
- ≥785 ≥980 ≥12 ≥55 ≥980 294-388 -
Bars and strip hot rolled and forged. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
16-20 - ≥830 ≥980 ≥16 ≥70 - - ≥37
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥20 ≥28 ≥58 ≥100 - - -
Rods made of steel 12KH2N4A (ЭИ83) TU 14-1-1885-85. Quenching in oil with 840-880 °C + Quenching in oil with 775-805 °C + Vacation at 150-170 °C, air cooling. In the graph KCU KCU values are shown along the fiber/KCU across the grain
Образец 15х15 - ≥885 ≥1080 ≥12 ≥55 ≥981/- 294-387 -
Bars and strip hot rolled and forged. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
21-25 - ≥780 ≥930 ≥17 ≥70 - - ≥36
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥15 ≥23 ≥62 ≥100 - - -
Bars and rods of steel treated in the ladle a synthetic slag in the delivery condition on the other 14-1-658-73. Samples of the cross
- - - ≥7 ≥35 ≥588 - -
Bars and strip hot rolled and forged. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
6-15 - ≥930 ≥1080 ≥14 ≥65 - - ≥38
Rolled steel. Cementation at 920-950 °C + Quenching in oil with 780-800 °C + Vacation at 180-200 °C, air cooling or oil
40-60 - ≥950 ≥1200 ≥10 ≥50 ≥800 255-302 59-63

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 a, 10-6 1/°C
20 200 7840 -
300 - 7760 13

A description of the physical symbols

Name Description
Е The normal elasticity modulus
G Modulus of elasticity shear torsion
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability limited weldability. RDS, ADS submerged.
Склонность к отпускной хрупкости inclined
The temperature of forging Beginning - 1220 °C, end - 800 °C. the cross Sections up to 100 mm are cooled in air, 101-300 mm in the pit.
Flock-sensitive sensitivity sensitive
Machinability when NV 183-187 Kn TV.SPL.=1.26 Kn b.St.=0.95
Macrostructure and pollution Macrostructure of steel when testing for the breaks in the longitudinal direction and transverse templeto selected from rolled, should not have shrinkage, porosity, bubbles, cracks, delamination, inclusions and placenow and defects of fracture, listed in Annex 3 GOST 10243. The Central porosity, point heterogeneity and phase separation in the square should not exceed 1 points; layer-by-layer crystallization and the bright loop - 3 points reference scales GOST 10243. All other defects under GOST 10243, are not allowed. Pollution steel non-metallic inclusions should be according to the average score is not higher (in points): oxides of point 1,5, 2,0 stroke oxides, silicates fragile 1,0, 1,0 silicates plastic, silicates, non-deformed 2,5, 2,5 sulfides, nitrides stroke and point 1,0.