Alloy Alsi9 (АЛ4)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
АК9ч |
| Designation GOST Latin |
AK9ch |
| Transliteration |
AK9ch |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
АЛ4 |
| Designation GOST Latin |
AL4 |
| Transliteration |
AL4 |
| The chemical elements |
- |
Description
Ak9ch alloy used: for the manufacture of ingots and shaped castings by various casting methods (sand casting, investment casting, gravity die casting, pressure casting); details of medium and high loading; casting parts of valves and actuators; castings of high-and medium-load and high integrity in all ways, except for the molding.
Note
Aluminum foundry alloy of the system Al-Si-Mg. The alloy has high integrity.
Heat-treatable alloy with good strength properties. For corrosion resistance and technological characteristics of the alloy close to alloy grade AK12.
Standards
| Name |
Code |
Standards |
| 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 5.9397-90 |
Chemical composition
| Standard |
Mn |
Si |
Ni |
Fe |
Cu |
Al |
Zn |
Sn |
Pb |
Mg |
Be |
| GOST 1583-93 |
0.2-0.5 |
8-10.5 |
≤0.1 |
≤0.6 |
≤0.3 |
The rest |
≤0.3 |
≤0.01 |
≤0.05 |
0.17-0.3 |
≤0.1 |
Al is the base.
According to GOST 1583-93, the total content of zirconium and titanium is ≤ 0.15%. The iron content is indicated for casting in sand molds and for investment models. The content of iron during casting into the mold is ≤ 0.90%, when casting under pressure ≤ 1.00%. The amount of allowable impurities should be for casting in sand molds and for investment models ≤ 1.10%, casting in chill molds ≤ 1.40%, injection molding ≤ 1.50%.
Mechanical characteristics
| σB, MPa |
d |
Brinell hardness number, MPa |
| Casting (gravity die casting, pressure, liquid die forging, gravity die casting and sand casting of modified alloy). Mode T1: Artificial aging at 170-180 °C (excerpt 5-17 hours) |
| ≥196 |
≥1.5 |
≥60 |
| Casting (sand casting, investment casting, gravity die casting, pressure). Without heat treatment |
| ≥147 |
≥2 |
≥50 |
| Castings of the modified alloy. T6 mode: Quenching in water from 530-540 °C (extract 2-6 h) + Artificial aging at 170-180 °C (extract 10-15 hours) |
| ≥225 |
≥3 |
≥70 |
| ≥235 |
≥3 |
≥70 |
| Casting. T6 mode: Quenching in water from 530-540 °C (extract 2-6 h) + Artificial aging at 170-180 °C (extract 10-15 hours) |
| ≥225 |
≥2 |
≥70 |
| ≥235 |
≥3 |
≥70 |
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 |
468 |
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. |
| Workability by cutting |
The alloy is well processed by cutting and grinding. |
| Corrosion resistance |
To improve the corrosion resistance of the casting is subjected to anodic oxidation. |
