25KH13N2 steel is used: for the manufacture methods of hot and cold deformation and machining parts with high ductility, load and operating at temperatures up to +450−500 °C; products exposed to slightly aggressive media at room temperature; the various parts of the aircraft; parts for automatic lathes, which require a high corrosion resistance in atmospheric conditions and increased hardness (HRC-50−54).

Note

Steel corrosion-resistant martensitic class.

Standards

Name	Code	Standards
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Bars and shapes	В32	GOST 18907-73, OST 4-020.023-78, OST 4-020.024-78, OST 4-020.025-78, TU 14-1-721-73, TU 14-11-245-88
Sheets and strips	В33	GOST 4405-75
Classification, nomenclature and General rules	В30	GOST 5632-72
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-1-721-73	0.2-0.3	0.15-0.25	0.08-0.15	0.8-1.2	12-14	≤0.5	1.5-2	Rest	-	-	-	-	-
GOST 5632-72	0.2-0.3	0.15-0.25	0.08-0.15	0.8-1.2	12-14	≤0.5	1.5-2	Rest	≤0.3	≤0.2	≤0.2	≤0.3	≤0.2

Fe is the basis.
According to TU 14-1-721-73, the chemical composition is given for steel grade 25X13N2 (EI474). The permissible deviations from the chemical composition are in accordance with ChMTU 1-950-70.

Mechanical properties

Section, mm	t отпуска, °C	σ_U, MPa	d₅, %	HB, MPa	HRC
Rolled steel. Annealing in air from 1030-1050 °C + Vacation
-	200	≥1620	≥3	-	≥55
Bars hot rolled, polished grooved steel with special surface finish as supplied on the other 14-1-721-73. Annealing at 740-800 °C
-	-	686-980	-	207-285	-
Bars of polished, processed on a given strength (TS) according to GOST 18907-73
1-30	-	690-980	-	-	-
Rolled steel. Annealing in air from 1030-1050 °C + Vacation
-	300	≥1590	≥7	-	≥54
Bars. Annealing or vacation at 740-800 °C
5	-	≥830	≥10	207-285	-
Rolled steel. Annealing in air from 1030-1050 °C + Vacation
-	400	≥1530	≥3	-	≥53
-	500	≥1470	≥3	-	≥51
-	600	≥1220	≥6	-	≥39
-	700	≥730	≥9	-	≥30
-	800	≥710	≥9	-	≥27

Description mechanical marks

Name	Description
σ_U	Limit short-term strength
d₅	Elongation after rupture
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
20	7680	18	-
100	-	19	116
200	-	20	12
300	-	22	124
400	-	24	124
600	-	-	128

A description of the physical symbols

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

Technological properties

Name	The value
The temperature of forging	Start - 1150 °C, the end - of 800 °C. Cooling is carried out slowly in the furnace.
Machinability	Steel has the best machinability on the machines compared to the same steels.

Steel 25KH13N2 (ЭИ474)

Designation

Description