18H12VMBFR (EI993, 2H12VMBFR)

blades of steam turbines, pipes and fasteners for long life at temperatures up to 620 degrees.; martensitic steel — ferritic class

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Heat resistant steels and alloys	Heat resistant high alloy steel

Chemical composition

Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ni, %	V, %	P, %	C, %	S, %	Nb, %	Mo, %	W, %
Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ni, %	V, %	P, %	C, %	S, %	Nb, %	Mo, %	W, %
GOST 5632-72	83.782–87.7	< 0.5	< 0.003	< 0.5	11–13	< 0.06	0.15–0.18	< 0.03	0.15–0.22	< 0.025	0.2–0.4	0.4–0.6	0.4–0.7

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$
Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$
20	228		27.6	7850
100		11.15	21.8
200	215	11.13	24
300	209	11.42	25.1
400	195	11.8	26.3
500	188	12	27.2
600	173	12.5	28
700	155	12.65	28.9
800		11.6

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Trumpet					820	640	17	56	900	Normalization of 1050 ° C, air cooling, and Holidays 750 ° C, 3 hours, air cooling
Trumpet					750	590	15	43	400	Normalization of 1050 ° C, air cooling, and Holidays 750 ° C, 3 hours, air cooling
Rod	GOST 5949-75	60			740	490	12	45	390	Hardening and tempering

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Rod	GOST 5949-75	annealing	229

Technological Properties

Weldability
Weldability
Not applicable for welded structures

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K
Ac₁, K	Ac₃(Ac_m), K
850	930

Standards

Standard	Description
Standard	Description
GOST 5632-72
GOST 5949-75
TU 14-1-552-72

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Mn	%	Manganese
Cr	%	Chrome
Ni	%	Nickel
V	%	Vanadium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Nb	%	Niobium
Mo	%	Molybdenum
W	%	Tungsten

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$E\cdot 10^{9}$	$MPa$	Elastic modulus
$\alpha\cdot 10^{6}$	$K^{-1}$	Coefficient of thermal (linear) expansion (range 20°C–T)
$\varkappa$	$\frac{W}{m\cdot K}$	Coefficient of thermal conductivity (the heat capacity of the material)
$\rho$	$\frac{kg}{m^3}$	The density of the material

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\epsilon_L$	%	Elongation at break (longitudinal)
$\psi$	%	Reduction in cross section on fracture
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness

Designation of types of weldability

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
no limits		Welding is performed without heating and without subsequent heat treatment
Boundedly welded		Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld		For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures

Description of temperatures of critical points

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K