Steel 31KH19N9MVBT (ЭИ572)

Designation

Name	The value
Designation GOST Cyrillic	31Х19Н9МВБТ
Designation GOST Latin	31X19H9MBBT
Transliteration	31H19N9MVBT
By chemical elements	31Cr19Н9MoWNbTi

Name	The value
Designation GOST Cyrillic	ЭИ572
Designation GOST Latin	EI572
Transliteration	EhI572
By chemical elements	-

Description

31KH19N9MVBT steel is used: for the production of stamped blanks of turbine blades; rotors; rotors; bolts and special fasteners; shafts operating at temperatures to +600 °C.

Note

Steel complexly alloyed heat-resistant austenitic class.
The recommended maximum operating temperature for a long time +600 °C. the Temperature of beginning of intensive scaling in air +800 °C.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and strips	В33	GOST 4405-75
Classification, nomenclature and General rules	В30	GOST 5632-72
Bars and shapes	В32	GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 108.02.122-87, TU 14-11-245-88
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90
Thermal and thermochemical treatment of metals	В04	STP 26.260.484-2004

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	Nb	W
GOST 5632-72	0.28-0.35	≤0.02	≤0.035	0.8-1.5	18-20	≤0.8	8-10	Rest	≤0.3	≤0.2	0.2-0.5	1-1.5	0.2-0.5	1-1.5

Fe is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %
Forgings up to 100 mm. Quenching in water from 1180±10 °C + Ageing at 800±10 °C (extract 15 h), air cooling
	≥295	≥690	27-35	30-40
Disk. Quenching in water from 1150-1180 °C + Aging at 700 °C (50 h exposure)
-	315-420	725-860	32-50	25-58
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥830	≥410	≥27	≥35
Bars hot rolled and forged according to GOST 5949-75. Quenching in water with 1140-1180 °C + Aging at 750-800 °C (extract 15 h), air cooling
	≥295	≥590	≥30	≥40
Disk. Quenching in water from 1150-1180 °C + Aging at 700 °C (50 h exposure)
-	≥315	≥690	≥32	≥46
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥790	≥370	≥32	≥44
Bars hot rolled and forged at STP 26.260.484-2004. Quenching in water with 1140-1180 °C + Aging at 750-800 °C, exposure 15 h, air cooling
	≥320	≥600	≥30	≥40
Disk. Quenching in water from 1150-1180 °C + Aging at 700 °C (50 h exposure)
-	≥305	≥660	≥28	≥43
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥860	≥410	≥19	≥19
Disk. Quenching in water from 1150-1180 °C + Aging at 700 °C (50 h exposure)
-	≥275	≥620	≥26	≥45
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥860	≥430	≥17	≥17
Disk. Quenching in water from 1150-1180 °C + Aging at 700 °C (50 h exposure)
-	≥255	≥580	≥26	≥46
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥610	≥330	≥28	≥33
Disk. Quenching in water from 1150-1180 °C + Aging at 700 °C (50 h exposure)
-	≥245	≥410	≥21	≥40
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥790	≥370	≥20	≥36
Disk. Quenching in water from 1150-1180 °C + Aging at 700 °C (50 h exposure)
-	≥195	≥235	≥29	≥64
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥810	≥330	≥16	-
Disk. Quenching in water from 1150-1180 °C + Ageing at 800 °C (extract 15 h), air cooling
-	320-390	730-820	31-44	40-49
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥470	≥320	-	-
Disk. Quenching in water from 1150-1180 °C + Ageing at 800 °C (extract 15 h), air cooling
-	≥245	≥480	≥20	≥46
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥530	≥350	-	-
Disk. Quenching in water from 1150-1180 °C + Ageing at 800 °C (extract 15 h), air cooling
-	≥235	≥430	≥24	≥55
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥660	≥310	-	-
Disk. Rotor. Quenching in water from 1150-1180 °C + Ageing at 750 °C (aging 12-15 h) (tangential samples)
-	340-570	600-840	9-34	10-42
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥430	≥370	≥3	≥14
Disk. Rotor. Quenching in water from 1150-1180 °C + Ageing at 750 °C (aging 12-15 h) (tangential samples)
-	285-390	560-580	12-23	19-34
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥780	≥350	≥23	≥26
Disk. Rotor. Quenching in water from 1150-1180 °C + Ageing at 750 °C (aging 12-15 h) (tangential samples)
-	365-380	520-580	12-23	16-34
Disc diameter 900 mm radial Samples (indicated by temperature and duration of heat exposure)
-	≥610	≥340	-	-
Disk. Rotor. Quenching in water from 1150-1180 °C + Ageing at 750 °C (aging 12-15 h) (tangential samples)
-	355-400	520-580	12-24	16-38
Rod. Quenching in water from 1150 °C
-	≥950	≥450	≥22	≥48
Disk. Rotor. Quenching in water from 1150-1180 °C + Ageing at 750 °C (aging 12-15 h) (tangential samples)
-	235-330	490-520	13-24	16-34
-	235-330	490-510	15-21	16-39
-	245-320	410-470	12-23	16-41
-	235-255	340-420	17-29	25-53
A sample with a diameter of 6 mm, length 30 mm, forged and annealed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
-	≥275	≥315	≥33	≥68
-	≥205	≥215	≥28	≥67
-	≥115	≥125	≥45	≥85
-	≥66	≥80	≥54	≥90
-	≥41	≥49	≥59	≥94

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

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C
0	201	78	7960	-	-	-
20	205	-	7960	-	-	-
300	186	68	-	18	980	172
400	181	65	-	20	1020	175
500	175	62	-	22	1080	178
550	175	-	-	-	-	-
600	167	58	-	24	1100	182
650	165	-	-	-	-	-
700	157	54	-	25	1150	185
100	-	-	-	15	850	166
200	-	-	-	16	900	169
800	-	-	-	-	-	189
1000	-	-	-	-	-	193
1200	-	-	-	-	-	197

A description of the physical symbols

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

Technological properties

Name	The value
Weldability	difficult weldability. The welding process - SMAW. To relieve welding stresses, the recommended heat treatment.
The temperature of forging	Start - 1230 °C, the end of - 900 °C. air Cooling.
Machinability	In heat treated condition with HB of 175 Kn TV.SPL.=0.6 Kn b.St.=0.3
Features of heat treatment	Steel products 31KH19N9MVBT for equipment of chemical industry can be termoobrabotannyj regime: hardening with 1140-1180 °C in water and aging at 750-800 °C for 15 hours with air cooling.