3A21
3A21 is an Al-Mn alloy, an excellent military aluminum alloy material. 3A21 aluminum plate is a widely used This kind of anti-rust aluminum has low strength (only slightly higher than industrial pure aluminum) and cannot be strengthened by heat treatment, so cold working methods are often used to improve its strength.Mechanical properties: It has high plasticity in the annealed state, good plasticity during semi-cold work hardening, low plasticity during cold work hardening, and resistance to It has good corrosion resistance, good weldability, but poor machinability.
Content
Chemical composition of 3A21 (%)
| Chemicai composition | |
|---|---|
| Si | 0.6 |
| Fe | 0.7 |
| Cu | 0.2 |
| Mn | 1.0-1.6 |
| Mg | 0.05 |
| Cr | - |
| Zn | 0.1 |
| Ti | 0.15 |
| other impurity（singleness） | 0.05 |
| other impurity（sum） | 0.1 |
| AL | remainder |
Physical properties of 3A21
| Aluminum alloy grades and status | 3A21-H112 |
|---|---|
| Tensile Strength Rm/Mpa | 120 |
| Yield Strength Rp0.2/Mpa | - |
| Elongation % | 16 |
| Hardness/HBWα | - |
| Density（20℃)（g/cm3） | 2.75 |
Applications of 3A21
3A21 is mainly used in aerospace, military equipment,Tooling, automobiles, transportation, propellant productionStorage tanks, skins, end frames, brackets, etc. of welded structural cabinsWelding parts, and pipes working in corrosive media, etc.
