VSt3sp (St3sp)
bearing elements of welded and non-welded structures and components operating at positive temperatures. Shaped and sheet products (category 5) — for the bearing members of welded structures operating under variable loads: rolled at a thickness up to 25 mm in the temperature range from -40 to +425 ° C; rolled at a thickness of over 25 mm — from -20 to +425 ° C, provided with a guaranteed delivery weldability.
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 |
97.76–99.34 |
0.12–0.3 |
0.4–0.65 |
< 0.3 |
< 0.3 |
< 0.3 |
< 0.08 |
< 0.04 |
0.14–0.22 |
< 0.05 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
|---|
| 20 |
194 |
7850 |
| 100 |
192 |
|
| 200 |
187 |
|
| 300 |
183 |
|
| 400 |
178 |
|
| 500 |
167 |
|
| 600 |
159 |
|
| 700 |
146 |
|
| 800 |
120 |
|
| 900 |
99 |
|
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 |
|
< 100 |
|
|
353 |
175 |
28 |
55 |
640 |
Normalization |
| Forgings |
|
100–300 |
|
|
353 |
175 |
24 |
50 |
590 |
Normalization |
| Rental hot rolled. |
|
< 20 |
|
|
370–480 |
245 |
26 |
|
|
delivery condition |
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| no limits |
not sensitive |
not inclined |
Critical point temperatures
| Ac1, K |
Ac3(Acm), K |
Ar3(Arcm), K |
Ar1, K |
|---|
| 735 |
850 |
835 |
680 |
Analogues
| Germany |
USA |
|---|
| RSt37-2 |
A570-36 |
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 |
|