Alloy AK9 (АЛ4В)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
АК9 |
| Designation GOST Latin |
AK9 |
| Transliteration |
AK9 |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
АЛ4В |
| Designation GOST Latin |
AL4B |
| Transliteration |
AL4V |
| The chemical elements |
- |
Description
Alloy AK9 is used: for the manufacture of ingots and castings of different casting methods (sand casting, investment casting, gravity die casting, pressure casting); the production of shaped castings of parts of metallurgical equipment; casting parts, metallurgical equipment (large and medium complex configuration parts of crankcases and engine blocks operating at temperatures above +200 °C.
Note
Aluminum foundry alloy of the system Al-Si-Mg.
Heat-treatable alloy with good strength properties, but with reduced toughness and corrosion resistance.
Advantages: High casting technological properties and mechanical strength. Satisfactory weldability and machinability.
Disadvantages: Relatively complicated technology of casting, reduced resistance, increased gas porosity.
Technological characteristics of the alloy close to alloy grade Ak9ch.
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 |
| Castings from non-ferrous metals and alloys |
В84 |
OST 1 80029-83, OST 24.916.01-71, OST 5.9397-90 |
Chemical composition
| Standard |
Mn |
Si |
Ni |
Fe |
Cu |
Al |
Ti |
Zn |
Zr |
Mg |
| GOST 1583-93 |
0.2-0.5 |
8-11 |
≤0.3 |
≤0.9 |
≤1 |
The rest |
- |
≤0.5 |
- |
0.2-0.4 |
| KSt 81-033:2009 |
0.2-0.5 |
8-10.5 |
≤0.1 |
- |
≤0.1 |
The rest |
≤0.05 |
≤0.2 |
≤0.01 |
0.17-0.3 |
Al is the base.
According to GOST 1583-93 and OST 24.916.01-71 in the alloy AK9, the iron content is indicated for casting in sand molds and for investment models. The iron content for molding in the mold is ≤ 1.20%, when casting under pressure ≤ 1.30%. The amount of impurities accounted for should be for casting in sand molds and for investment models ≤ 2.60%, casting in chill molds ≤ 2.80%, injection molding ≤ 3.00%. The chemical compositions of the alloys AK9s, AK9h (AL4) and AK9pt (AL4-1) differ from the chemical composition of AK9 - see the corresponding grades.
According to KSt 81-033: 2009, the chemical composition is given for the alloy AK9h (AL4), the total content of Zr + Ni ≤ 0.12%.
Mechanical characteristics
| σB, MPa |
d |
Brinell hardness number, MPa |
| Casting as supplied. Without heat treatment |
| ≥157 |
- |
≥70 |
| Casting (gravity die casting, pressure, liquid die forging). Mode T1: Artificial aging at 170-180 °C (excerpt 5-17 hours) |
| ≥196 |
≥0.5 |
≥70 |
| Casting (sand casting, investment casting, gravity die casting, pressure, liquid die forging). Without heat treatment |
| ≥157 |
≥1 |
≥60 |
| Casting gravity die casting (including 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) |
| ≥245 |
≥1 |
≥90 |
| Castings of the modified alloy (sand casting, investment casting). T6 mode: Quenching in water from 530-540 °C (extract 2-6 h) + Artificial aging at 170-180 °C (extract 10-15 hours) |
| ≥235 |
≥1 |
≥80 |
Description mechanical marks
| Name |
Description |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
Physical characteristics
| Temperature |
r, кг/м3 |
| 20 |
2650 |
A description of the physical symbols
| Name |
Description |
| l |
Coefficient of thermal conductivity |
| С |
Specific heat |
