Designation
| Name |
The value |
| Designation GOST Cyrillic |
АК4 |
| Designation GOST Latin |
AK4 |
| Transliteration |
AK4 |
| By chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
1140 |
| Designation GOST Latin |
1140 |
| Transliteration |
1140 |
| By chemical elements |
1140 |
Description
Alloy AK4 is used: for the manufacture of parts for jet engines.
Standards
| Name |
Code |
Standards |
| Bars |
В55 |
GOST 21488-97, GOST Р 51834-2001, OST 1 90395-91, TU 1-2-83-77 |
| Non-ferrous metals, including rare, and their alloys |
В51 |
GOST 4784-97 |
| Bars and shapes |
В52 |
GOST 8617-81, GOST 13616-97, GOST 13617-97, GOST 13618-97, GOST 13619-97, GOST 13620-90, GOST 13621-90, GOST 13622-91, GOST 13623-90, GOST 13624-90, GOST 13737-90, GOST 13738-91, GOST 17575-90, GOST 17576-97, GOST 29296-92, GOST 29303-92, GOST Р 50066-92, GOST Р 50067-92, GOST Р 50077-92, OST 1 92093-83 |
| Processing of metals by pressure. Forgings |
В03 |
OST 1 90073-85 |
| Tubes of non-ferrous metals and alloys |
В64 |
TU 1-2-361-79, TU 1-2-69-77 |
Chemical composition
| Standard |
Mn |
Si |
Ni |
Fe |
Cu |
Al |
Ti |
Zn |
Mg |
| GOST 4784-97 |
≤0.2 |
0.5-1.2 |
0.8-1.3 |
0.8-1.3 |
1.9-2.5 |
Rest |
≤0.1 |
≤0.3 |
1.4-1.8 |
Al is the base.
According to GOST 4784-97, the mass fraction of each other impurity (not regulated) ≤ 0.05%, the total mass fraction of other impurities ≤ 0.10%.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
HB, MPa |
| Forgings supplied. Without heat treatment |
|
≥260 |
≥360 |
≥3 |
≥100 |
| Forging cross-sections up to 300 mm and forming a cross-section up to 150 mm OST 1 90073-85. Mode T1: Quenching + artificial aging (in the cross section indicates the direction of the samples) |
|
≥255 |
≥355 |
≥3 |
≥100 |
|
≥265 |
≥365 |
≥4 |
≥100 |
|
≥265 |
≥365 |
≥4 |
≥100 |
|
≥275 |
≥375 |
≥5 |
≥100 |
| Profiles and pressed bars normal strength according to GOST 8617-81, GOST 21488-97 in the delivery condition (longitudinal samples) |
|
- |
≥355 |
≥8 |
- |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
| HB |
Brinell hardness number |
Physical characteristics
| Temperature |
Е, HPa |
r, kg/m3 |
l, W/(m · °C) |
| 20 |
72 |
2770 |
180 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
