12KHN2 steel is used: for the manufacture of 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.

Note

The structural quality steel chrome-Nickel.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В32	GOST 1051-73, GOST 4543-71, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-5.46-72, 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
Steel pipes and fittings to them	В62	GOST 8732-78, GOST 9567-75, GOST 23270-89, GOST 8731-87, GOST Р 53383-2009, TU 14-3-1654-89
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90
Processing of metals by pressure. Forgings	В03	TU 14-1-1530-75
Sheets and strips	В33	TU 14-1-546-72
Tape	В34	TU 3-126-81

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 4543-71	0.09-0.16	≤0.035	≤0.035	0.3-0.6	0.6-0.9	0.17-0.37	1.5-1.9	Rest	≤0.3	≤0.05	≤0.03	≤0.15	≤0.2

Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Seamless hot deformed tubes in the delivery condition heat treated
	-	≥392	≥539	≥14	-	-	-	-
Long products (wire). Quenching in water or oil from 860 °C + Quenching in water or oil with 760-810 °C + Vacation at 180 °C, cooling in air or in oil
≤15	-	≥590	≥780	≥12	≥50	≥863	-	-
Rolled steel. Normalization at 860 °C + Quenching in oil from 810 °C to + Vacation
-	200	≥830	≥1050	≥13	≥66	-	-	≥27
Long products (wire). Quenching in oil at 880 °C + Vacation at 600 °C, cooling in water
15-30	-	≥420	≥550	≥29	≥79	≥363	-	-
Rolled steel. Normalization at 860 °C + Quenching in oil from 810 °C to + Vacation
-	300	≥860	≥980	≥12	≥68	-	-	≥25
Long products (wire). Cementation at 920-950 °C + Quenching in oil with 790-810 °C + Vacation at 180-200 °C, air cooling
60-100	-	≥590	≥780	≥12	≥45	≥677	≥249	57-63
Rolled steel. Normalization at 860 °C + Quenching in oil from 810 °C to + Vacation
-	400	≥890	≥950	≥12	≥70	-	-	≥24
Long products (wire). Cyanidation at 840-860 °C + Quenching in oil 840-860 °C + Vacation at 180-200 °C, air cooling
30-60	-	≥590	≥780	≥12	≥50	≥863	≥229	≥57
Rolled steel. Normalization at 860 °C + Quenching in oil from 810 °C to + Vacation
-	500	≥780	≥830	≥15	≥72	-	≥216	-
-	600	≥590	≥670	≥22	≥76	-	≥321	-

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	G, HPa	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
600	154	60	30	-	136	586
700	141	55	29	-	139	624
800	130	50	29	1050	139	624
900	-	-	-	1120	-	-
1000	-	-	-	-	117	703

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	Start - 1250 °C, the end - of 800 °C. the cross Sections up to 100 mm are cooled in air, 101-300 mm - mulde.
Flock-sensitive sensitivity	not sensitive.
Machinability	When HB 156-207 Kn TV.SPL.=0.8 Kn b.St.=0,7.

Steel 12KHN2

Designation

Description