18HG

For carburized parts of small sections of working friction

Classification

Country Section Category
CIS, Russia, Ukraine Structural steel Alloyed structural steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % P, % C, % S, %
GOST 4543-71 96.35–97.88 0.17–0.37 0.9–1.2 0.9–1.2 < 0.3 < 0.3 < 0.035 0.15–0.21 < 0.035

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % Treatment
Rod GOST 4543-71 15 880 735 10 40 Tempering 880 ° C, oil, leave 200 ° C, air

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 4543-71 annealing 1870

Technological Properties

Flake Susceptibility Propensity to temper brittleness
sensitive inclined

Critical point temperatures

Ac1, K Ac3(Acm), K
765 840

Analogues

USA Germany
H51200 1.7149 (20MnCrS5)

Standards

Standard Description
GOST 4543-71

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Cu % Copper
Ni % Nickel
P % Phosphorus
C % Carbon
S % Sulfur

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

Description of temperatures of critical points

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