Designation
| Name |
The value |
| Designation GOST Cyrillic |
Д21 |
| Designation GOST Latin |
D21 |
| Transliteration |
D21 |
| By chemical elements |
Д21 |
| Name |
The value |
| Designation GOST Cyrillic |
1210 |
| Designation GOST Latin |
1210 |
| Transliteration |
1210 |
| By chemical elements |
1210 |
Description
Alloy Д21 used: for the manufacture of engine parts and power components in the aircraft industry.
Standards
| Name |
Code |
Standards |
| Non-ferrous metals, including rare, and their alloys |
В51 |
OST 1 90048-90 |
| Processing of metals by pressure. Forgings |
В03 |
OST 1 90073-85 |
| Bars |
В55 |
OST 1 90395-91 |
Chemical composition
| Standard |
Mn |
Si |
Fe |
Cu |
Al |
Ti |
Zn |
Mg |
| OST 1 90048-90 |
0.4-0.8 |
≤0.3 |
≤0.3 |
6-7 |
Rest |
0.1-0.2 |
≤0.1 |
0.25-0.45 |
Al is the base.
According to OST 1 90048-90 mass fraction of each other impurity (not regulated) ≤ 0.05%, total mass fraction of other impurities ≤ 0.10%.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
HB, MPa |
| Forgings supplied |
| - |
≥260 |
≥400 |
≥6 |
≥100 |
| Forgings up to 200 mm and forming up to 150 mm OST 1 90073-85. Mode T1: Quenching + artificial aging (indicated by the direction of samples) |
|
≥285 |
≥380 |
≥3 |
≥100 |
|
≥295 |
≥400 |
≥6 |
≥100 |
|
≥285 |
≥390 |
≥4 |
≥100 |
|
≥295 |
≥400 |
≥7 |
≥100 |
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 |
