12KHN3A 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; bimetallic seamless tubes for shipbuilding with an outer layer of steel and an inner layer of copper.

Note

The high quality stainless steel construction.
Steel case hardening.

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 10702-78, GOST 14955-77, TU 14-1-5414-2001, TU 14-1-1885-85, TU 14-1-2118-77, TU 14-1-2765-79, TU 14-1-950-74, TU 14-1-3238-81, TU 14-11-245-88, TU 14-1-3238-2006, TU 14-1-1271-75, TU 14-1-5228-93, 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
Steel pipes and fittings to them	В62	GOST 21729-76, GOST 22786-77, TU 14-3-493-76, TU 14-3-675-78, TU 14-3-864-79, TU 14-3-1823-91
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 14-1-4944-90, TU 14-1-4992-91, TU 1-92-156-90
Processing of metals by pressure. Forgings	В03	OST 5Р.9125-84, TU 14-1-1530-75, ST ЦКБА 010-2004
Sheets and strips	В33	TU 14-1-1409-75

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-1-1885-85	0.1-0.16	≤0.015	≤0.025	0.3-0.6	0.6-0.9	0.17-0.37	2.75-3.15	Rest	≤0.25	-	-	-	-
TU 14-1-950-74	0.1-0.16	≤0.025	≤0.025	0.3-0.6	0.6-0.9	0.17-0.37	2.75-3.15	Rest	≤0.25	≤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 steel grade 12ХН3А-Ш.
According to TU 14-1-950-86, the chemical composition is given for steel grade 12ХН3А.
According to TU 14-1-3238-81 the chemical composition is given for steel grade 12ХН3А. For steel grade 12ХН3А-СШ the content S≤0,015%.
According to TU 14-1-1885-85 the chemical composition is given for steel grade 12ХН3А-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
Bimetalic seamless tubes for shipbuilding with an inner layer of copper, heat-treated in the delivery condition according to GOST 22786-77
	-	-	≥323	≥20	-	-	-	-
Pipe seamless cold drawn, cold rolled and toplocatie, heat-treated in the delivery condition according to GOST 21729-76
	-	-	≥490	≥16	-	-	-	-
Rod. About carburizing at 910 °C (delay of 9 h) + quenching in oil from 810 °C to + vacation at 200 °C, air cooling
≤10	-	≥1080	≥1220	≥13	≥60	≥1540	-	≥35
Bars hot rolled, forged and calibrated. Quenching in oil with 840-880 °C + second quenching in oil from 780-820 °C + vacation at 150-170 °C, air cooling
	-	≥685	≥930	≥11	≥55	≥1080	269-388	-
Rolled steel. Billets with a diameter of 70 mm. Quenching in oil from 800 °C + vacation
-	200	≥1270	≥1370	≥12	≥60	≥980	≥400	-
A specimen of 10 mm diameter and 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain Rate of 0.002 1/s.
-	-	≥70	≥140	≥41	≥78	-	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	-	-	-	-	262-388	24-41
Bars and strip hot rolled and forged. Quenching in oil with 845-875 °C + Second quenching in oil with 780-810 °C + vacation at 150-170 °C, air cooling
	-	≥685	≥930	≥11	≥55	≥1080	269-363	-
Rod. About carburizing at 910 °C (delay of 9 h) + quenching in oil from 810 °C to + vacation at 200 °C, air cooling
10-15	-	≥780	≥980	≥16	≥65	≥1490	-	≥32
Rolled steel. Billets with a diameter of 70 mm. Quenching in oil from 800 °C + vacation
-	300	≥1130	≥1270	≥13	≥68	≥780	≥380	-
A specimen of 10 mm diameter and 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain Rate of 0.002 1/s.
-	-	≥29	≥89	≥61	≥97	-	-	-
Steel calibrated and calibrated with special surface finish, hot rolled and hot rolled with special surface finish
-	-	-	-	-	-	-	≤217	-
Rods made of steel 12KHN3A on the other 14-1-1885-85. Quenching in oil with 840-880 °C + Quenching in oil with 780-810 °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	-	≥685	≥930	≥11	≥55	≥1079/-	269-363	-
Rod. About carburizing at 910 °C (delay of 9 h) + quenching in oil from 810 °C to + vacation at 200 °C, air cooling
15-20	-	≥730	≥880	≥16	≥70	≥1619	-	≥30
Cementation at 920-950 °C + quenching in oil from 800-820 °C + vacation at 160-200 °C, air cooling
30-60	-	≥830	≥980	≥12	≥55	≥1158	≥303	59-64
Rolled steel. Billets with a diameter of 70 mm. Quenching in oil from 800 °C + vacation
-	400	≥1080	≥1200	≥14	≥68	≥830	≥375	-
A specimen of 10 mm diameter and 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain Rate of 0.002 1/s.
-	-	≥27	≥68	≥58	≥100	-	-	-
Rod. About carburizing at 910 °C (delay of 9 h) + quenching in oil from 810 °C to + vacation at 200 °C, air cooling
20-25	-	≥640	≥830	≥20	≥70	≥1884	-	≥28
Cementation at 920-950 °C + quenching in oil from 800-820 °C + vacation at 160-200 °C, air cooling
60-100	-	≥690	≥830	≥10	≥50	≥765	≥250	57-63
Rolled steel. Billets with a diameter of 70 mm. Quenching in oil from 800 °C + vacation
-	500	≥930	≥1030	≥19	≥70	≥1180	≥280	-
A specimen of 10 mm diameter and 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain Rate of 0.002 1/s.
-	-	≥23	≥44	≥63	≥100	-	-	-
Rolled steel. Billets with a diameter of 70 mm. Quenching in oil from 800 °C + vacation
-	600	≥670	≥730	≥24	≥75	≥1670	≥230	-
A specimen of 10 mm diameter and 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain Rate of 0.002 1/s.
-	-	≥23	≥43	≥73	≥100	-	-	-
-	-	≥12	≥25	≥70	≥100	-	-	-
-	-	≥10	≥18	≥67	≥100	-	-	-
Samples with a diameter of 28-50 mm. Annealing at 880-900 °C + quenching in oil from 860 °C to + vacation at 600 °C (extract 3 hours)
-	-	≥540	≥670	≥21	≥75	-	-	-
-	-	≥520	≥630	≥20	≥74	-	-	-
-	-	≥500	≥630	≥12	≥70	-	-	-
-	-	≥430	≥530	≥20	≥75	-	-	-
-	-	≥390	≥410	≥19	86	-	-	-
-	-	≥240	≥260	≥21	≥82	-	-	-

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	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
300	7760	-	14	-
400	7720	26	147	528
500	7680	-	153	540
600	7640	-	153	540
800	-	-	156	565

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. 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	In hot-rolled condition in NV 183-187 Kn TV.SPL.=1.26 Kn b.St.=0.96
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 12KHN3A

Designation

Description