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
Standards
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 |
|