Properties of aluminum profiles
The density of pure aluminum is small (ρ = 2.7g / cm3), about 1 / 3 of iron, low melting point (660 ° C), aluminum is face-centered cubic structure, so it has a high plasticity (δ: 32 ~ 40%, φ: 70 ~ 90%), easy to process, can be made into various profiles, plates, good corrosion resistance; However, the strength of pure aluminum is very low, and the annealing state σ b value is about 8kgf / mm2, so it is not suitable for structural materials. Through long-term production practice and scientific experiments, people have gradually strengthened aluminum by adding alloying elements and using heat treatment methods, which has obtained a series of aluminum alloys. The alloy formed by adding certain elements can maintain the advantages of pure aluminum light and have high strength, and the σ b values can reach 24 ~ 60 kgf / mm2. This makes its “specific strength” (the ratio of strength to specific gravity σ b / p) better than many alloy steels, As an ideal structural material, it is widely used in machinery manufacturing, transportation machinery, power machinery and aviation industry, etc. The fuselage, skin, compressor and other aircraft are often made of aluminum alloy to reduce their own weight. Using aluminum alloy to replace the welding of steel plate material, the structural weight can be reduced by more than 50%.
