Designation
| Name |
The value |
| Designation GOST Cyrillic |
Д20 |
| Designation GOST Latin |
D20 |
| Transliteration |
D20 |
| By chemical elements |
Д20 |
| Name |
The value |
| Designation GOST Cyrillic |
1200 |
| Designation GOST Latin |
1200 |
| Transliteration |
1200 |
| By chemical elements |
1200 |
Description
Alloy D20 is used: for the manufacture of welded products, parts of jet engines, operating at temperatures up to 300−350 °C; weldments and tanks, working briefly at temperatures from -253 to +300 °C; the profiles with the cross-sectional area of 200 cm2 and a diameter of circumcircle up to 350mm suitable for use in the aviation industry and special machine building industries; moulded panels of constant cross section with longitudinal fins in the aircraft industry, is made by a sweep of extruded finned tubes in the plane of the width of the fabric up to 2100 mm; large extruded pipes.
Note
High-strength alloy (σin=380 MPa, σ1000150° =280 MPa).
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В52 |
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, OST 1 92041-90, OST 1 92069-77, OST 1 90113-86 |
| Sheets and strips |
В53 |
GOST 17232-99, OST 1 90246-77, OST 1 90166-75, TU 1-2-34-76, TU 1-804-473-2009 |
| 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, TU 1-9-814-81 |
| Tubes of non-ferrous metals and alloys |
В64 |
OST 1 92048-90, OST 1 92048-76, TU 1-4-163-89 |
| Tape |
В54 |
OST 1-92006-79 |
| Welding and cutting metals. Soldering, riveting |
В05 |
TU 1-9-210-81 |
Chemical composition
| Standard |
Mn |
Si |
Fe |
Cu |
Al |
Ti |
Zn |
Zr |
Mg |
| OST 1 90048-90 |
0.4-0.8 |
≤0.3 |
≤0.3 |
6-7 |
Rest |
0.1-0.2 |
≤0.1 |
≤0.2 |
≤0.05 |
| TU 1-804-473-2009 |
0.4-0.8 |
≤0.3 |
≤0.3 |
6-7 |
Rest |
0.1-0.2 |
≤0.1 |
≤0.2 |
≤0.05 |
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, % |
d |
HB, MPa |
| Rolled steel in the delivery state |
|
≥240 |
≥360 |
- |
≥8 |
≥100 |
| The tape is able to supply for OST 1-92006-79 |
| 0.8-10.5 |
- |
≤235.2 |
- |
≥15 |
- |
| 5-10.5 |
≥254.8 |
≥362.6 |
- |
≥7 |
- |
| Panels are extruded with fins on OST 1 92041-90 on delivery |
|
≥235 |
≥345 |
≥8 |
- |
- |
| Plate in the delivery condition on the other 1-804-473-2009 |
| 11-80 |
- |
≥275 |
- |
≥12 |
- |
| 11-80 |
- |
≥275 |
- |
≥12 |
- |
| Plates according to GOST 17232-99 in the delivery condition (transverse specimens) |
| 11-80 |
- |
≥275 |
- |
≥12 |
- |
| 11-80 |
≥275 |
≥370 |
- |
≥8 |
- |
| 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) |
|
- |
≥365 |
- |
≥4 |
≥100 |
|
≥255 |
≥375 |
- |
≥10 |
≥100 |
| Extruded normal strength with the cross-sectional area 200 cm2 and a diameter of circumcircle up to 350mm (sample a longitudinal, in cross-section shows the thickness of the shelf). Quenching + artificial aging |
|
≥235 |
≥345 |
- |
≥8 |
- |
| Extruded normal strength with the cross-sectional area 200 cm2 and a diameter of the circumscribed circle of up to 350 mm. (sample longitudinal cross-section shows the thickness of the shelf). Quenching + natural aging |
|
- |
≤275 |
- |
≥12 |
- |
| Large-size extruded tubes according to OST 1 92048-76 on delivery |
|
≥235 |
≥353 |
- |
≥7 |
- |
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 |
| d |
Elongation after rupture |
| HB |
Brinell hardness number |
