20H3MVF (EI579, EI415)

Rotors, disks, forgings, rods, fasteners; high pressure pipes for the chemical hydrogenation apparatus and installations

Classification

Country Section Category
CIS, Russia, Ukraine Heat resistant steels and alloys Heat-resistant relaxation-resistant steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % V, % P, % C, % S, % Mo, % W, %
GOST 20072-74 93.145–95.38 0.17–0.37 0.25–0.5 2.8–3.3 < 0.2 < 0.3 0.6–0.85 < 0.03 0.15–0.23 < 0.025 0.35–0.55 0.3–0.5

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20 207 38.5 7800
100 204 10.6 35.6 0.502 0.398
200 200 11.5 33.1 0.56 0.465
300 193 11.8 31.4 0.61 0.544
400 186 12.1 30.6 7690 0.65 0.64
500 182 12.6 29.7 7660 0.71 0.743
600 177 13 29.3 7620 0.75 0.859
700 171 28.9 0.982

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
Rod GOST 20072-74 880 735 12 40 590 Hardening of 1030-1060 ° C, the oil, leave 660-700 ° C
Shaft, rotor 750 650 13 40 500 Hardening of 1030-1060 ° C, the oil, leave 660-700 ° C
Shaft, rotor 730 620 11 32 400 Hardening of 1030-1060 ° C, the oil, leave 660-700 ° C

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 20072-74 annealing, hot rolling 269

Technological Properties

Weldability
Boundedly welded

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K
800–830 900–950 790–800 680–700

Analogues

Germany USA
Almenit 8509 6470

Standards

Standard Description
GOST 20072-74

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Cu % Copper
Ni % Nickel
V % Vanadium
P % Phosphorus
C % Carbon
S % Sulfur
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
$$c\cdot 10^{-3}$$ $$\frac{J}{kg\cdot K}$$ The specific heat of the material (range 20°C–T)
$$R\cdot 10^{-6}$$ $$\Omega\cdot m$$ Electrical resistivity

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
Ar3(Arcm) K
Ar1 K