20HMFBR

fasteners for use at temperatures up to 580 degrees.

Classification

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

Chemical composition

Standard Fe, % Si, % B, % Mn, % Cr, % Cu, % Ni, % V, % P, % C, % S, % Nb, % Mo, %
TU 14-1-552-72 94.105–96.83 < 0.37 < 0.005 0.5–0.8 1–1.5 < 0.2 < 0.45 0.7–1 < 0.03 0.17–0.26 < 0.03 < 0.15 0.8–1.1

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$
20 217 7900
100 211 41
200 205 46.1
300 196 48.2
400 188 50.2
500 180 52.8
600 167 54.4
700 152 56.1

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
Alloy 1076 958 13.3 46.6 150 Normalization of 1100 ° C, and Holidays 650 ° C, 6 h
Rod Longitudinal 900 15 55 400 Normalization of 1100 ° C, and Holidays 730 ° C, 5 hours

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K
810 950 800 690

Standards

Standard Description
TU 14-1-552-72

Description of chemical elements

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

Description of physical characteristics

Parameter Units of measurement Description
$$E\cdot 10^{9}$$ $$MPa$$ Elastic modulus
$$\varkappa$$ $$\frac{W}{m\cdot K}$$ 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

Description of temperatures of critical points

Parameter Units of measurement Description
Ac1 K
Ac3(Acm) K
Ar3(Arcm) K
Ar1 K