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
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, %
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

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$
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
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
Rod GOST 5949-75 annealing 229

Technological Properties

Weldability
Not applicable for welded structures

Critical point temperatures

Ac1, K Ac3(Acm), K
850 930

Standards

Description of chemical elements

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
$$E\cdot 10^{9}$$ $$MPa$$ 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
$$\sigma _{U}$$ $$MPa$$ 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
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
Ac1 K
Ac3(Acm) K