The AK12 alloy (AL2)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
АК12 |
| Designation GOST Latin |
AK12 |
| Transliteration |
AK12 |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
АЛ2 |
| Designation GOST Latin |
AL2 |
| Transliteration |
AL2 |
| The chemical elements |
- |
Description
The AK12 alloy is used: for the manufacture of ingots and castings of different casting methods (sand casting, investment casting, gravity die casting, pressure casting); casting parts mining and metallurgical machinery; casting parts, metallurgical equipment (thin-walled open-casting devices, housings of pumps and other components with high integrity, operating at temperatures above +200 °C). casting parts of pipe fittings and drives thereto; castings of complex configuration, including large, operating at low to medium loads and pressures not exposed to temperatures above 150 °C.
Note
Aluminum foundry alloy of the system Al-Si-Mg.
Thermally neurocinema alloy with low strength properties, satisfactory corrosion resistance to air, fresh water, oil and fuel, and reduced in sea water. has high casting properties (high fluidity, a capacity and integrity, small casting shrinkage, not prone to hot cracking). To increase the strength and ductility of the alloy subjected to modification. Is prone to formation of large gas porosity. The alloy has the worst machinability compared to other aluminum alloys.
Alloy is not recommended for producing parts that require high surface finish after machining.
Standards
| Name |
Code |
Standards |
| Castings with special properties (cast iron and steel) |
В83 |
KSt 81-033:2009 |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
GOST 1583-93, OST 4.021.009-92, OST 4.021.010-92 |
| Castings from non-ferrous metals and alloys |
В84 |
OST 26-07-1114-74, OST 1 80029-83, OST 24.916.01-71, OST 5.9397-90 |
Chemical composition
| Standard |
Mn |
Si |
Fe |
Cu |
Al |
Ti |
Zn |
Zr |
Mg |
| GOST 1583-93 |
≤0.5 |
10-13 |
≤0.7 |
≤0.6 |
The rest |
≤0.1 |
≤0.3 |
≤0.1 |
≤0.1 |
| OST 24.916.01-71 |
≤0.5 |
10-13 |
≤0.8 |
≤0.6 |
The rest |
- |
≤0.3 |
- |
≤0.1 |
| KSt 81-033:2009 |
≤0.5 |
10-13 |
- |
≤0.6 |
The rest |
≤0.1 |
≤0.3 |
≤0.1 |
≤0.1 |
Al is the base.
According to GOST 1583-93, the iron content is specified for casting in sand molds and for investment models. The content of iron during casting in the mold is ≤ 1.0%, when casting under pressure ≤ 1.50%. The amount of impurities accounted for should be for sand casting and for investment models ≤ 2.10%, die casting ≤ 2.20%, die casting ≤ 2.70%.
According to KSt 81-033: 2009, the total content of Zr + Ni ≤ 0.12%.
According to OST 24.916.01-71, the iron content is specified for casting in sand molds and for investment models. The content of iron during casting in the mold is ≤ 1.0%, when casting under pressure ≤ 1.50%. The amount of allowable impurities should be for casting in sand molds and for investment models ≤ 2.30%, die casting ≤ 2.20%, die casting ≤ 2.80%. When using an alloy for the manufacture of parts working in the marine environment, the copper content should not exceed 0.30%.
Mechanical characteristics
| σB, MPa |
d |
Brinell hardness number, MPa |
| Casting as supplied. Without heat treatment |
| ≥147 |
≥4 |
≥50 |
| ≥157 |
≥2 |
≥50 |
| ≥157 |
≥1 |
≥50 |
| Casting, sand casting, investment casting, gravity die casting of a modified alloy in delivery condition. Without heat treatment |
| ≥147 |
≥4 |
≥50 |
| Casting, sand casting, investment casting, gravity die casting of the modified alloy. Mode T2: Annealing at 290-310 °C, exposure of 2-4 hours |
| ≥137 |
≥4 |
≥50 |
| Casting as supplied. Mode T2: Annealing at 290-310 °C, exposure of 2-4 hours |
| ≥147 |
≥3 |
≥50 |
| ≥147 |
≥2 |
≥50 |
Description mechanical marks
| Name |
Description |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
R, НОм · м |
| 20 |
70 |
2650 |
548 |
A description of the physical symbols
| Name |
Description |
| l |
Coefficient of thermal conductivity |
| С |
Specific heat |
Technological properties
| Name |
The value |
| Weldability |
Alloy welded satisfactorily gas and organomegaly methods. |
| Corrosion resistance |
To improve the corrosion resistance of the alloy is subjected to anodic oxidation. |
