2xxx · Al-Cu · ASTM B209 / EN AW-2024
2024-T3 Aluminum
High-strength copper alloy widely used in aerospace. Density is ~2.78 g/cm³ — about 3% heavier than the generic 2.70 assumption.
Density
2.78 g/cm³
2780 kg/m³
Yield (Rp0.2)
325 MPa
typical
Tensile (Rm)
470 MPa
typical
Elongation
20%
A
Modulus E
73 GPa
elastic
Hardness
120 HB
T3
α thermal
23.2×10⁻⁶/K
expansion
k thermal
121 W/m·K
conductivity
Density vs the 2.70 myth
True density for 2024-T3 Aluminum is 2.78 g/cm³. Using 2.70 introduces a +2.96% mass error.
1 m² × 10 mm plate (correct ρ)
27.80 kg
Same plate if ρ = 2.70
27.00 kg
Weldability
Poor
Machinability
Good
Corrosion resistance
Fair
Typical applications
- • Aerospace structure
- • Aircraft skins
- • High-strength fittings
Engineering pitfalls
- • Poor weldability — prefer mechanical fastening
- • Needs corrosion protection in many environments
Compare & related
Values are typical handbook figures for the stated temper (T3) and are intended for preliminary engineering. Production design must use certified material data and applicable design codes. Standard reference: ASTM B209 / EN AW-2024.