VSt6sp (St6sp)
for high strength parts: axles, shafts, pistons fingers and other parts in the heat treated condition, and also for pivotal armature periodic profile.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Structural steel |
Carbonaceous structural steel of ordinary quality |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Cu, % |
Ni, % |
As, % |
P, % |
C, % |
S, % |
|---|
| GOST 380-2005 |
97.29–98.97 |
0.15–0.35 |
0.5–0.8 |
< 0.3 |
< 0.3 |
< 0.3 |
< 0.08 |
< 0.04 |
0.38–0.49 |
< 0.05 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
|---|
| 20 |
197 |
7850 |
| 100 |
197 |
|
| 200 |
186 |
|
| 300 |
175 |
|
| 400 |
168 |
|
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 |
|---|
| Hire |
|
|
|
|
535 |
325 |
25 |
52 |
630 |
|
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| Boundedly welded |
not sensitive |
not inclined |
Critical point temperatures
| Ac1, K |
Ac3(Acm), K |
Ar3(Arcm), K |
Ar1, K |
|---|
| 725 |
790 |
780 |
690 |
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Cu |
% |
Copper |
| Ni |
% |
Nickel |
| As |
% |
Arsenic |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
Description of physical characteristics
| Parameter |
Units of measurement |
Description |
| $$E\cdot 10^{9}$$ |
$$MPa$$ |
Elastic modulus |
| $$\rho$$ |
$$\frac{kg}{m^3}$$ |
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 |
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 |
|