Alloy 1420 (01420)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
1420 |
| Designation GOST Latin |
1420 |
| Transliteration |
1420 |
| The chemical elements |
1420 |
| Name |
The value |
| Designation GOST Cyrillic |
01420 |
| Designation GOST Latin |
01420 |
| Transliteration |
01420 |
| The chemical elements |
01420 |
Description
Alloy 1420 is used: for the manufacture of components transport engineering; for use in aircraft structures (welded hermetic compartments of the edging of the Windows, components, etc.); buildings of the missile; in the land transport (forged wheels).
Note
Sredneprochny corrosion resistant high modulus welded alloy system Al-Mg-Li low density (d = 2,47 g/cm3, E = 78 GPA; properties in the direction of D: σin ≥ 420 MPa, σ0,2 ≥ 270 MPa, δ ≥ 9%).
The use of alloy for the aerospace the reduced mass of the riveted construction to 12%, weld to 24%. Effective use of alloy 1420 for the manufacture of stampings instead of alloy AK6 in connection with a reduced 10% density, high fatigue characteristics and corrosion resistance, modulus of elasticity.
Modification of alloy 1420 — 1421 and 1423, which optionally is alloyed with scandium and differ only in the content of magnesium.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
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 90262-81 |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
OST 1 90048-90, OST 1 90296-81 |
| Bars |
В55 |
TU 1-4-013-78 |
| Sheets and stripes |
В53 |
TU 1-92-28-84 |
Chemical composition
| Standard |
Si |
Fe |
Cu |
Al |
Ti |
Ca |
Zr |
Mg |
Be |
Sc |
Na |
Li |
| OST 1 90048-90 |
≤0.15 |
≤0.2 |
≤0.05 |
The rest |
≤0.1 |
≤0.04 |
0.08-0.12 |
4.5-6 |
0.0002-0.005 |
≤0.05 |
≤0.003 |
1.8-2.2 |
Al is the base.
According to OST 1 90048-90 the chemical composition is given for alloy 1420. The mass fraction of each other impurity (not regulated) is ≤ 0.05%, the total mass fraction of other impurities is ≤ 0.15%. In the alloy grade 1420 for welded products, the sodium content should not exceed 0.0015%. In the manufacture of molded semi-finished products from the 1420 alloy, a lower limit of lithium content of 1.90% is established. Beryllium is not determined by chemical analysis, but is introduced by calculation.
According to OST 1 90262-81 the allowable content of hydrogen in the metal should not exceed 1.0 cm 3 per 100 g of metal.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
| Sheet metal in delivery condition |
|
≥270 |
≥450 |
≥10 |
| Extruded in the delivered state for OST 1 90262-81. 1420Т - Quenching in water (longitudinal samples) |
|
≥275 |
≥412 |
≥7 |
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 |
| 20 |
75 |
2470 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
