Alloy aluminum AL21
Chemical composition
| Al |
Aluminum |
Rest |
| Fe |
Iron |
<0.6 |
| Si |
Silicon |
<0.5 |
| Mg |
Magnesium |
0.8 — 1.3 |
| Mn |
Manganese |
0.15 — 0.25 |
| Cu |
Copper |
4.6 — 6.0 |
| Ni |
Nickel |
2.6 — 3.6 |
| Cr |
Chromium |
0.1 — 0.2 |
| Zn |
Zinc |
<0.3 |
| Ot |
Total impurities |
<1.3 |
For the manufacture of shaped castings. Technical requirements GOST 2685−75 Cast aluminum alloys. Stamps
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Aluminum, aluminum alloys |
Foundry aluminum alloys |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mg, % |
Mn, % |
Cr, % |
Cu, % |
Zn, % |
Ni, % |
Al, % |
|---|
| GOST 2685-75 |
< 0.6 |
< 0.5 |
0.8–1.3 |
0.15–0.25 |
0.1–0.2 |
4.6–6 |
< 0.3 |
2.6–3.6 |
87.35–91.75 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
$$\varkappa$$, $$\frac{W}{m\cdot K}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
|---|
| 20 |
|
117.6 |
2830 |
| 100 |
22.9 |
|
|
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
Treatment |
|---|
| Alloy |
|
|
|
|
180–210 |
|
1 |
|
| Casting |
|
|
|
in sandy form |
220 |
200 |
1.5 |
|
Brinell hardness number
| Rolling |
Standard |
Classifiers |
Value, HBW |
| Alloy |
|
|
65–75 |
Casting and technological parameters
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mg |
% |
Magnesium |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Cu |
% |
Copper |
| Zn |
% |
Zinc |
| Ni |
% |
Nickel |
| Al |
% |
Aluminium |
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 |
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) |
Description of the casting and technological parameters
| Parameter |
Units of measurement |
Description |
| linear shrinkage |
% |
The difference between model dimensions and the model casting |