7005 aluminium alloy
7005 is an aluminium alloy used bicycle frames, due to its relative ease of welding it does not require expensive heat treating - it is however harder to form making manufacture more challenging.
It has an Ultimate Tensile Strength of 350MPa, a Fatigue Strength of 150MPa and a density of 2.78g/cm³
compared to a Ultimate Tensile Strength of 310MPa and Fatigue Strength of 96.5 MPa and a density of 2.70g/cm³ for 6061 aluminium alloy.
It does not need to be precipitation hardened, unlike 6061, but can be cooled in air.
Specific forms of AL 7005 include:
- 7005-O
- 7005-T5
- 7005-T53
- 7005-T6
The alloy composition of 7005 is:
- Aluminium 91.0% - 94.7%
- Chromium 0.06% - 0.20%
- Copper <=0.10 %
- Iron <=0.40 %
- Magnesium 1.0% - 1.80%
- Manganese 0.20% - 0.70%
- Silicon <=0.35%
- Titanium 0.010% - 0.060%
- Zinc 4.0% - 5.0%
- Zirconium 0.080% - 0.20%
- Other, total <= 0.15%
