30L
levers, balancers, gearbox housings, couplings, pulleys, brackets, parts welded-cast structures, bowls and cones zasypnyh machines, frame, beam, bearing rings, bandages, flywheels and other parts operating under the influence of the average static and dynamic loads.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Steels and alloys for castings |
Ordinary steel for castings |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
P, % |
C, % |
S, % |
|---|
| GOST 977-88 |
98.11–99.08 |
0.2–0.52 |
0.45–0.9 |
< 0.06 |
0.27–0.35 |
< 0.06 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
$$\varkappa$$, $$\frac{W}{m\cdot K}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
$$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ |
|---|
| 20 |
|
|
7810 |
|
| 100 |
12.6 |
76 |
|
0.47 |
| 200 |
13.9 |
65 |
|
0.483 |
| 400 |
15 |
44 |
|
0.525 |
| 500 |
15.6 |
38 |
|
|
| 600 |
|
|
|
0.571 |
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 |
|---|
| Castings |
GOST 977-88 |
< 100 |
|
|
471 |
255 |
17 |
30 |
343 |
Normalization of 880-900 ° C, 610-630 ° C and Holidays |
| Castings |
GOST 977-88 |
|
|
|
491 |
294 |
17 |
30 |
343 |
Tempering 860-880 ° C, 610-630 ° C and Holidays |
Brinell hardness number
| Rolling |
Standard |
Classifiers |
Value, HBW |
| Alloy |
|
|
131–217 |
Casting and technological parameters
| linear shrinkage, % |
|---|
| 2.2–2.3 |
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 |
|---|
| 735 |
813 |
796 |
677 |
Режимы термической обработки
| Обработка |
|---|
| Нормализация 880 - 900 ° C, Отпуск 610 - 630 ° C |
| Закалка 860 - 880 ° C, Отпуск 610 - 630 ° C |
Analogues
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
Description of physical characteristics
| Parameter |
Units of measurement |
Description |
| $$\alpha\cdot 10^{6}$$ |
$$K^{-1}$$ |
Coefficient of thermal (linear) expansion (range 20°C–T) |
| $$\varkappa$$ |
$$\frac{W}{m\cdot K}$$ |
Coefficient of thermal conductivity (the heat capacity of the material) |
| $$\rho$$ |
$$\frac{kg}{m^3}$$ |
The density of the material |
| $$c\cdot 10^{-3}$$ |
$$\frac{J}{kg\cdot K}$$ |
The specific heat of the material (range 20°C–T) |
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 the casting and technological parameters
| Parameter |
Units of measurement |
Description |
| linear shrinkage |
% |
The difference between model dimensions and the model casting |
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 |
|