25H1M1F (P2MA, 25H1M1FA)

One-piece rotors, shafts, wheels and others. Parts operating at temperatures up to 540 ° C, fasteners for use at temperatures up to 525 ° C

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, %
GOST 20072-74 95.185–96.96 0.17–0.37 0.4–0.7 1.5–1.8 < 0.2 < 0.3 0.15–0.3 < 0.03 0.22–0.29 < 0.025 0.6–0.8

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20 216 7820 0.233
100 214 10.9 40.6 7800 0.283
200 210 12 39.8 7770 0.349
300 205 12.7 39 7740 0.428
400 197 13.65 37.7 7700 0.519
500 186 13.72 36 7670 0.633
600 171 13.82 33.9 7640 0.746
700 14 31 7600 0.862

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
Forgings < 300 650 450 16 50 600 Normalization and high holidays

Critical point temperatures

Ac1, K Ac3(Acm), K
770–805 840–880

Analogues

Germany
1.7709 (21CrMoV5-7)

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

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
$$R\cdot 10^{-6}$$ $$\Omega\cdot m$$ 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

Description of temperatures of critical points

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