7xxx · Al-Zn · ASTM B209 / EN AW-7075
7075-T6 Aluminum
Very high strength zinc alloy. Density ~2.81 g/cm³ — a 2.70 assumption underestimates weight by ~4%. Do not weld for structural joints.
Density
2.81 g/cm³
2810 kg/m³
Yield (Rp0.2)
505 MPa
typical
Tensile (Rm)
570 MPa
typical
Elongation
11%
A
Modulus E
72 GPa
elastic
Hardness
150 HB
T6
α thermal
23.6×10⁻⁶/K
expansion
k thermal
130 W/m·K
conductivity
Density vs the 2.70 myth
True density for 7075-T6 Aluminum is 2.81 g/cm³. Using 2.70 introduces a +4.07% mass error.
1 m² × 10 mm plate (correct ρ)
28.10 kg
Same plate if ρ = 2.70
27.00 kg
Weldability
Poor
Machinability
Fair
Corrosion resistance
Fair
Typical applications
- • Aerospace fittings
- • High-stress tooling
- • Racing components
Engineering pitfalls
- • Poor weldability — mechanical fastening preferred
- • Stress-corrosion cracking risk in some environments
- • Higher cost and density than 6061
Compare & related
Values are typical handbook figures for the stated temper (T6) and are intended for preliminary engineering. Production design must use certified material data and applicable design codes. Standard reference: ASTM B209 / EN AW-7075.