Alloy AK8 (1380)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
АК8 |
| Designation GOST Latin |
AK8 |
| Transliteration |
AK8 |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
1380 |
| Designation GOST Latin |
1380 |
| Transliteration |
1380 |
| The chemical elements |
1380 |
Description
Alloy AK8 is used: for the production of highly loaded parts of aircraft; parts operating in conditions of cryogenic temperatures; large extruded pipes; casting into metal mold.
Note
ISO 209−1 alloy AK8 is the brand designation АlCu4SiMg and 2014.
Heat-treatable alloy of high strength. For corrosion resistance of the alloy to aluminum-silicon alloys.
Standards
| Name |
Code |
Standards |
| Bars |
В55 |
GOST 21488-97, GOST Р 51834-2001, OST 1 90395-91 |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
GOST 4784-97, OST 1 92014-90 |
| Metal forming. Forgings |
В03 |
OST 1 90073-85 |
| Pipes from non-ferrous metals and alloys |
В64 |
OST 1 92048-90, OST 1 92048-76, TU 1-2-293-79, TU 1-4-062-87 |
| Sectional and shaped rolling |
В52 |
OST 1 92093-83 |
| Castings from non-ferrous metals and alloys |
В84 |
OST 5.9397-90 |
Chemical composition
| Standard |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
Al |
Ti |
Zn |
Mg |
| GOST 4784-97 |
0.4-1 |
≤0.1 |
0.5-1.2 |
- |
≤0.7 |
3.9-5 |
The rest |
≤0.15 |
≤0.25 |
0.2-0.8 |
| OST 1 92014-90 |
0.4-1 |
- |
0.6-1.2 |
≤0.1 |
≤0.7 |
3.9-4.8 |
The rest |
≤0.1 |
≤0.3 |
0.4-0.8 |
Al is the base.
According to GOST 4784-97 the chemical composition is given for the alloy AK8. The total mass fraction of titanium + zirconium ≤ 0.20%, the mass fraction of each other impurity (not regulated) ≤ 0.05%, the total mass fraction of other impurities ≤ 0.15%.
According to OST 1 92014-90 the chemical composition is given for the alloy AK8. Mass fraction of each other impurity (not regulated) ≤ 0.05%, total mass fraction of other impurities ≤ 0.10%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
Brinell hardness number, MPa |
| Forgings for OST 1 90073-85. Mode T1: Quenching + artificial aging (indicated by the direction of samples) |
| ≤75 |
- |
≥355 |
≥4 |
≥120 |
| 75-250 |
- |
≥355 |
≥4 |
≥110 |
| ≤75 |
- |
≥410 |
≥8 |
≥120 |
| 75-250 |
- |
≥385 |
≥6 |
≥110 |
| ≤75 |
- |
≥390 |
≥6 |
≥120 |
| 75-150 |
- |
≥390 |
≥6 |
≥110 |
| ≤75 |
≥315 |
≥430 |
≥10 |
≥120 |
| 75-150 |
≥295 |
≥410 |
≥8 |
≥110 |
| Forgings for OST 1 90073-85. Mode T: Quenching + natural aging (indicated by the direction of samples) |
| ≤150 |
- |
≥365 |
≥8 |
≥110 |
| 150-250 |
- |
≥355 |
≥7 |
≥110 |
| ≤150 |
≥245 |
≥385 |
≥10 |
≥110 |
| 150-250 |
≥235 |
≥375 |
≥8 |
≥110 |
| ≤150 |
≥235 |
≥365 |
≥8 |
≥110 |
| ≤150 |
≥245 |
≥385 |
≥11 |
≥110 |
| The pressed bars normal strength in the delivery condition according to GOST 21488-97 (longitudinal samples) |
| 150-300 |
- |
≥430 |
≥8 |
- |
| 8-150 |
- |
≥450 |
≥10 |
- |
| Bars extruded high tensile strength in the delivery condition according to GOST 21488-97 (longitudinal samples) |
| 8-300 |
≥335 |
≥460 |
≥8 |
- |
| Large-size extruded tubes according to OST 1 92048-76 on delivery |
|
≥294 |
≥412 |
≥8 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
R, НОм · м |
| 20 |
74 |
2800 |
43 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
The weldability of the alloy is satisfactory. |
| Workability by cutting |
The alloy has good machinability. |
