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	s_T\|s_0,2, MPa	σ_U, 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
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	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.

Steel 12KH2N4A (ЭИ83)

Designation

Description